A chemical symbol represents the shorthand of an element. It is a one- or two-letter abbreviation that is used to represent an element in chemical formulas and equations.
What are chemical symbol?The first letter of the symbol is always capitalized, and the second letter is lowercase, if there is a second letter. For example, the chemical symbol for hydrogen is H, the chemical symbol for oxygen is O, and the chemical symbol for carbon is C.
Chemical symbols are derived from the Latin names of the elements. For example, the chemical symbol for hydrogen is derived from the Latin word "hydrogenium," which means "water-former."
Chemical symbols are an important part of chemistry because they allow chemists to communicate with each other easily. They also help to simplify chemical formulas and equations, making them easier to understand.
Find out more on chemical symbol here: https://brainly.com/question/28424774
#SPJ6
A chemical symbol is a one- or two-letter designation that represents an element's name, used for single atoms or larger quantities.
A chemical symbol represents the name of an element. It is a one- or two-letter abbreviation that signifies a single atom of an element (microscopic domain) or a collection of atoms within a sample of that element (macroscopic domain). For instance, the chemical symbol for mercury is 'Hg'. Many chemical symbols are derived from their English names, with the initial letter capitalized and any subsequent letter in lower case. For example, 'O' represents oxygen, 'Zn' represents zinc, and 'Fe' represents iron. Certain elements, particularly those known since ancient times, retain symbols based on their Latin names. Chemical symbols are also used to create chemical formulas that show the types and numbers of atoms in a molecule of a compound.
Question 8(Multiple Choice Worth 4 points)
(08.05 LC)
Which statement is true for a solution when its concentration of hydronium ions increases?
It becomes less acidic.
Its pH value increases.
Its pH value decreases.
It becomes more alkaline.
The true statement for a solution when its concentration of hydronium ions increases then pH decreases.
What is pH?pH of any solution is used to define the acidity, basicity or neutrality of the solution.
pH ranges from 0 to 6.9 shows acidity.pH 0 shows the neutrality.pH ranges from 7.1 to 14 shows basicity.pH will be calculated as:
pH = -log[H⁺]
From the equation it is clear that concentration of hydronium ion increases, pH value decreases and acidity increases.
Hence, pH value decreases as hydronium ion increases.
To know more about pH, visit the below link:
https://brainly.com/question/172153
#SPJ2
"Do you own a dog?" might be an example of which concept?
Pneumograph
Detection cue
Control question
Baseline answer
The concept illustrated in the question, "Do you own a dog?", is a control question. A control question is used to establish a baseline response for comparison.
Explanation:The concept illustrated in the question, "Do you own a dog?", is a control question.
A control question is a type of question used to establish a baseline response for comparison. It is typically unrelated to the topic being discussed and is used to ensure the accuracy and reliability of the answers given.
In this example, asking someone if they own a dog would serve as a control question if the actual topic of conversation is something unrelated to dogs or pets.
The unique characteristic of the amino acid cysteine is _____.
Answer: since it has a very reactive sulfhydryl group at its side chain. This puts cysteine in special position that cannot be replaced or substituted by any other amino acid. Because disulfide bridges formed by cysteine residues are permanent component of protein primary structure.
Explanation:
Classify each statement about catalysts as true or false.Catalysts lower activation energyCatalysts are consumed by the overall reactionCatalyst speed up the chemical reactions
Answer:
[tex]\boxed{\text{True; False; True}}[/tex]
Explanation:
Catalysts lower activation energy. TRUE.
They provide an alternate pathway with a lower activation energy.
Catalysts are consumed by the overall reaction. FALSE.
They take part in the reaction, but they can be recovered unchanged at the end.
Catalysts speed up the chemical reactions. TRUE.
If the activation energy is lowered, a greater percentage of the molecules will have enough energy to get over the energy barrier.
Its like lowering the high-bar in a track and field meet. The lower the bar, the more athletes will be able to get over it.
The radioactive decay of a certain sample produced 846 disintegrations per minute. exactly 3.00 days later, the rate of decay was found to be 269 disintegrations per minute. calculate the half-life, in days, for the decay of this sample.
Answer:
[tex]\boxed{\text{1.81 da}}[/tex]
Explanation:
1. Calculate the decay constant
The integrated rate law for radioactive decay is 1
[tex]\ln\dfrac{A_{0}}{A_{t}} = kt[/tex]
where
A₀ and A_t are the counts at t = 0 and t
k is the radioactive decay constant
[tex]\ln \dfrac{846}{269} = k \times 3.00\\\\\ln3.145 = 3.00k\\1.146 = 3.00k\\\\k =\dfrac{1.146}{3}\\\\k = \text{0.382 /da}\\[/tex]
2. Calculate the half-life
[tex]t_{\frac{1}{2}} = \dfrac{\ln2}{k} = \dfrac{\ln2}{0.382} = \text{1.81 da}[/tex]
The half-life for decay is [tex]\boxed{\textbf{1.81 da}}[/tex].
Select the true statement. ANSWER Unselected Anions are smaller than their neutral parent atoms because there are fewer electrons “competing” for the attractive force of the protons in the nucleus. Unselected Anions are smaller than their neutral parent atoms because there are more electrons “competing” for the attractive force of the protons in the nucleus. Unselected Cations are smaller than their neutral parent atoms because there are fewer electrons “competing” for the attractive force of the protons in the nucleus. Unselected Cations are smaller than their neutral parent atoms because there are more electrons “competing” for the attractive force of the protons in the nucleus. Unselected
Cations, or positive ions, are smaller than their parent atoms because they have fewer electrons resulting in less electron-electron repulsion. Anions, or negative ions, are larger than their parent atoms because additional electrons increase electron-electron repulsion.
Explanation:The true statement in the choices given is: 'Cations are smaller than their neutral parent atoms because there are fewer electrons "competing" for the attractive force of the protons in the nucleus'.
When an atom forms a cation, or a positive ion, it loses one or more electrons from its valence shell. This reduction in the number of electrons minimizes the electron-electron repulsion and allows the protons in the nucleus to pull the remaining electrons closer, making the radius of the cation smaller than the parent atom. For example, an aluminium atom has a larger radius than an aluminium cation because the cation has fewer electrons, hence the remaining electrons are pulled closer to the nucleus.
On the other hand, anions form when a neutral atom gains one or more electrons in its valence shell. The added electrons increase repulsion among the electrons, causing the radius of an anion to be larger than that of its parent atom. For example, a sulfur atom has a smaller radius than a sulfide anion because the anion has more electrons, thus they spread out more due to increased electron-electron repulsion.
Learn more about Ions here:https://brainly.com/question/30663970
#SPJ12
The correct statement is that cations are smaller than their neutral parent atoms because there are less electrons competing for the attractive force of the protons in the nucleus. Conversely, anions are larger than their neutral parent atoms due to more electrons competing for the attractive force of the protons.
Explanation:The correct statement is: Cations are smaller than their neutral parent atoms because there are fewer electrons “competing” for the attractive force of the protons in the nucleus. A cation is a positively charged ion that is formed when a neutral atom loses one or more electrons from its valence shell. This loss of electrons results in a smaller atomic radius because there are fewer electrons 'competing' for the attractive force of the protons, allowing the atom to pull the remaining electrons closer to the nucleus.
Conversely, an anion is a negative ion that is formed when a neutral atom gains one or more electrons. This results in a greater repulsion among the electrons, which results in an increase in atomic radius. Hence, anions are larger than their neutral parent atoms because there are more electrons “competing” for the attractive force of the protons in the nucleus.
Learn more about Ion sizes here:https://brainly.com/question/30328384
#SPJ12
Over the last several decades, scientists have addressed the problem of nonrenewable natural resources such as fossil fuels. Humans are using fossil fuels at a rapid rate and scientists believe that one day we will run out of them. To solve this problem, research has been conducted on alternative energy sources. One alternative energy source is nuclear energy. Although nuclear energy is a good solution to this problem, there are concerns.
All BUT ONE of these describe a concern about nuclear energy.
A) presence of radioactive waste
B) little if any carbon emissions released into the air
C) contamination risk when transporting radioactive materials
D) thermal pollution from water released into nearby environment
The answer is D
Hope this helped
Answer:
If you only want to look at concerns then B would be the correct answer because that is a positive when using nuclear energy
Explanation:
Which is the most practical argument for the continued funding of space exploration?
A) Space exploration has led to the development and technological improvement of many everyday items.
B) Space exploration will one day show whether life exists on other planets in star systems similar to ours.
C) Space exploration gives scientists important data they can use to determine the origin of the universe.
C) Space exploration gives scientists important data they can use to determine the origin of the universe.
Answer:
C) Space exploration gives scientists important data they can use to determine the origin of the universe
Explanation:
Space is being explored from decades now in order to accumulate data that can provide us knowledge about origin of universe and, moreover it may help us finding some different natural resources which are not present on earth. Voyager 1 and 2 are such huge milestone in providing data that is being used for our concerns.
What is the function of an indicator in a titration
An indicator in a titration indicates when the reaction has reached its equivalence point by undergoing a noticeable color change. This color change marks the end point of the titration, providing an estimate for more accurate calculations of analyte concentration.
Explanation:The function of an indicator in a titration is to show when a reaction has reached its equivalence point, which is typically determined by a noticeable change in the color of the solution. Indicators like methyl orange, litmus, or phenolphthalein are substances that change color at or near the equivalence point of the titration. These color changes, which are sensitive to the pH level of the solution, mark the end point of the titration, allowing for accurate measurements and calculations of analyte concentration.
For instance, in a strong acid titration, the solution pH hits the lower limit of the methyl orange color change interval after the required amount of titrant has been added, thus changing the initial red solution to appear orange. On reaching the equivalence point, the solution turns yellow, suggesting the endpoint of the titration. Similarly, phenolphthalein goes colorless to pink around the equivalence point, helping to identify when the titration has been completed.
Learn more about indicators in a titration here:https://brainly.com/question/31783897
#SPJ6
The function of an indicator in a titration is to signal the end point of the reaction, which ideally corresponds to the equivalence point.
In titration, an indicator is a substance that changes color at a specific pH level, which is chosen to match the completion of the chemical reaction being studied. The equivalence point is the point at which the amount of titrant added is stoichiometrically equivalent to the amount of analyte in the solution. Since the equivalence point cannot be observed directly, an indicator is used to mark the end point, which is a visible change that occurs at or very near the equivalence point.
The choice of indicator is crucial and depends on the nature of the titration. For acid-base titrations, indicators are selected based on their pKa values, which should be close to the pH at the equivalence point. For example, phenolphthalein is commonly used for strong acid-strong base titrations because it changes color in the pH range of 8.2 to 10.0, which is suitable for such reactions.
The accuracy of the titration can be affected by the choice of indicator. If the pKa of the indicator is not close enough to the pH of the equivalence point, the end point and equivalence point may not coincide, leading to a titration error. Therefore, a good indicator should have a sharp color change within a narrow pH range that brackets the expected pH at the equivalence point.
In summary, the function of an indicator in titration is to provide a clear, observable change that indicates when the equivalence point has been reached, allowing for the precise determination of the concentration of the analyte.
PLEASE HELP IM TAKING MY CHEMISTRY FINALS RIGHT NOW
** GIVING 15 POINTS PLUS BRAINLIEST **
During a synthesis reaction, 2.4 grams of magnesium reacted with 8.0 grams of oxygen. What is the maximum amount of magnesium oxide that can be produced during the reaction?
Mg + O2 → MgO
A. 2.1 grams
B. 2.8 grams
C. 3.6 grams
D. 3.9 grams
Answer:
its d 3.9 not c
Explanation:
To find the maximum amount of magnesium oxide produced during the reaction, we need to determine the limiting reactant and calculate the moles of magnesium oxide produced. Using the mole ratio and converting grams to moles, we find that the maximum amount is 3.99 grams.
Explanation:To determine the maximum amount of magnesium oxide that can be produced during the reaction, we need to find the limiting reactant. First, we convert the given masses of magnesium and oxygen to moles using their respective molar masses. The balanced chemical equation tells us that the mole ratio of magnesium to magnesium oxide is 1:1, so the number of moles of magnesium is equal to the number of moles of magnesium oxide. Lastly, we convert the moles of magnesium oxide to grams using its molar mass to find the maximum amount of magnesium oxide that can be produced.
2.4 g Mg x (1 mol Mg / 24.31 g Mg) = 0.099 mol Mg8.0 g O2 x (1 mol O2 / 32.00 g O2) = 0.250 mol O2The mole ratio of Mg to MgO is 1:1, so we have 0.099 mol MgO0.099 mol MgO x (40.31 g MgO / 1 mol MgO) = 3.99 g MgOTherefore, the maximum amount of magnesium oxide that can be produced during the reaction is 3.99 grams.
Learn more about maximum amount of magnesium oxide produced here:https://brainly.com/question/35167818
#SPJ3
How many grams are in 1.946 moles of nacl
Answer:
113.8g
Explanation:
Statement of problem: mass of 1.946mole of NaCl
Given parameters:
Number of moles of NaCl = 1.946mole
Unknown: mass of NaCl
Solution
To find the mass of NaCl, we apply the concept of moles which expresses the relationship between number of moles and mass according to the equation below:
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
To find the molar mass of NaCl:
the atomic mass of Na = 23g
atomic mass of Cl = 35.5g
Molar mass of NaCl = (23 + 35.5) = 58.5gmol⁻¹
Mass of NaCl = Number of moles x molar mass of NaCl
Mass of NaCl = 1.946 x 58.5 = 113.8g
There would be approximately 113.72 grams in 1.946 moles of NaCl. This is calculated by using the molar mass of NaCl (58.44 g/mol) and multiplying it by the number of moles given.
Explanation:To find out how many grams are in 1.946 moles of NaCl, you need to use the molar mass of NaCl. The molar mass is the mass of one mole of a substance and for NaCl, it is calculated by adding the atomic masses of Sodium (Na) and Chlorine (Cl), which is approximately 58.44 grams per mole. Therefore, to find out the mass in grams of 1.946 moles of NaCl, you multiply 1.946 moles by the molar mass of NaCl, 58.44 g/mol.
1.946 moles NaCl * 58.44 g/mol NaCl = 113.72 grams NaCl
So, 1.946 moles of NaCl is approximately equal to 113.72 grams.
Learn more about Molar Mass here:https://brainly.com/question/12127540
#SPJ6
The electron configuration for phosphorous is 1s22s22p63s23p3. What is the lewis electron dot diagram for phosphorous?
Answer:
See the picture attached for the Lewis electron dot diagram for phosphorus.Explanation:
The Lewis electron diagram is a representation of the atoms that shows the the valence electrons present in the atom.
The Lewis electron diagram uses the chemical symbol of the element and adds one dot for every valence electron. The dots (valence electrons) are placed around the chemical symbol.
So, for phosphorues:
Chemical symbol: PNumber of valence electrons: 5 (theses are the five electrons in the outermost shell, two in 3s² plus three in 3p³).So you get the picture attached, with the chemical symbol P at the center, surroundeb by 5 dots: two dots above, one dot to the left, one dot to the right, and one dot below the chemical symbol.
Please, click on the image if you want to see it separately
The Lewis electron dot diagram for phosphorus shows five dots arranged around the elemental symbol 'P', indicating the five valence electrons.
Explanation:The student has asked for the Lewis electron dot diagram for phosphorus based on its electron configuration, which is 1s²2s²2p⁶3s²3p³. Phosphorus has a total of 15 electrons with the valence electrons being the most important for the Lewis structure. Considering the electron configuration, phosphorus has 5 valence electrons (in the 3s and 3p subshells). The Lewis dot diagram represents these 5 valence electrons as dots surrounding the symbol for phosphorus (P):
P : . .
.
.
One mole of which of these compounds contains two moles of hydrogen atoms?
NaOH
H2S
NH3
CH4
Answer:
One mole of H₂S contains 2 atoms of hydrogen
Explanation:
In one mole of NaOH : 1 atom of Na and 1 atom of O and 1 atom of H
one mole of H₂S : 2 atoms of H and 1 atom of S
one mole of NH₃ : 1 atom of N and 3 atoms of H
One mole of CH₄ : 1 atom of C and 4 atoms of H
what is the volume of 2.00 moles of ideal gas at 25'c and 121.59 kpa of pressure
Answer:
40.73 L.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm (P = 121.59 kPa/101.325 = 1.2 atm).
V is the volume of the gas in L (V = ??? L).
n is the no. of moles of the gas in mol (n = 2.0 mol).
R is the general gas constant (R = 0.082 L.atm/mol.K),
T is the temperature of the gas in K (T = 25°C + 273 = 298 K).
∴ V = nRT/P = (2.0 mol)(0.082 L.atm/mol.K)(298 K)/(1.2 atm) = 40.73 L.
How many atoms of fluorine are present in a molecule of carbon tetrafluoride?
Answer:
4 atoms.
Explanation:
ِA molecule of carbon tetrafluoride (CF₄) contains:1 atom of C and 4 atoms F.
So, a molecule of carbon tetrafluoride contains 4 atoms of flourine.
The vapor pressure of water at 50.0 c is 12.33 kpa. What is this value in millimeters of mercury?
Answer:
92.48 mmHgExplanation:
You need the conversion factor to convert the value of 12.33 kPa to milimiters of mercury, mmHg.
The converstion factors are looked at tables, which today you can find in internet.
Since the conversions between kPa and atm and between atm and mmHg are more widely known, I will show the conversion using those relations:
1 atm = 101.325 kPa 1 atm = 760 mmHg⇒ 101.325 kPa = 760 mmHg
Then, dividing both sides by 101.325 kPa you get the conversion factor:
1 = 760 mmHg / 101.325 kPaNow, multiply 12.33 kPa by that conversion factor:
12.33 kPa × 760 mmHg / 101.325 kPa = 92.48 mmHg ← answerFinal answer:
The vapor pressure of water at 50.0°C, which is 12.33 kPa, when converted to millimeters of mercury, is approximately 92.906 mmHg.
Explanation:
The vapor pressure of water at 50.0°C is given as 12.33 kPa. To convert this to millimeters of mercury (mmHg), we can use the conversion factor that 1 atm is equivalent to 101.325 kPa and also to 760 mmHg. Therefore, to convert kPa to mmHg, we multiply the pressure in kPa by the ratio of these two constants:
12.33 kPa * (760 mmHg / 101.325 kPa) = 92.906 mmHg (rounded to three significant figures).
Thus, the vapor pressure of water at 50.0°C is approximately 92.906 mmHg.
How has the work of chemists affected the environment?
A. A single chemical can sometimes both hurt and help the
environment.
B. The chemicals that chemists use can all be helpful to the
environment.
C. The work of some chemists causes environmental problems,
while the work of others tries to fix problems.
D. All chemists use chemicals that are bad for the environment.
The work performed by the chemists can be considered as the useful effect to fix a problem, while some work found to harm the environment. Thus, option C is correct.
Who are Chemists?Chemists are the group of individuals that deal with the drugs and the medicines. The research made the development of the new drugs and the compounds that are used by the population to treat several diseases.
The chemicals dealt by chemist are formed to be sensitive, and can be used to fix the problems, while sometimes the effect creates the compound that harm the environment.
Thus, option C is correct.
Learn more about chemists, here:
https://brainly.com/question/1674101
#SPJ2
What was the result of heating the mixture? All BUT ONE choice is correct.
Answer:
w gang alright
Explanation:
ay its b alright
Answer:
C is the right one
Explanation:
That dude is bugging that said B
Question 9(Multiple Choice Worth 4 points)
(08.01 LC)
What happens to water when it warms above 4 °C?
It contracts.
It forms ice.
Its density decreases.
Its composition changes.
Answer: It contracts and its density decreases, I believe.
Explanation:
Answer:
its density decreases
Explanation:
if 5 gases in a cylinder each have a partial pressure of 2.50 atm ,what is the total pressure exerted by the gases?
Answer:
12.5 atm.
Explanation:
The total pressure of a mixture of gases can be defined as the sum of the pressures of each individual gas:Ptotal = P1 + P2 + … + Pn.
∴ Ptotal = P of gas 1 + P of gas 2 + P of gas 3 + P of gas 4 + P of gas 5.
∴ Ptotal = 5(2.5 atm) = 12.5 atm.
Which location represents the enthalpy of reaction?
Answer:
Kindly find the attached image.
Explanation:
All the data related to the potential energy diagram is shown in the attached image.Reactants, intermediate, products, activation energy (Ea), and enthalpy change (ΔH).
Enthalpy change (ΔH) is the difference in energy between reactants and products.
ΔH = E of products - E of reactants.
Answer: Arrow E represents the enthalpy of the reaction.
Explanation:
Enthalpy of the reaction is defined as the difference in the potential energy of the products and the reactants. It is represented as [tex]\Delta H_{rxn}[/tex]
[tex]\Delta H_{rxn}=H_{products}-H_{reactants}[/tex]
From the image, the points marked represents:
Point A represents the potential energy of the reactants.
Point B represents the intermediate state or transition state in a reaction.
Point C represents the potential energy of the products.
Arrow D represents the activation energy of the reaction.
Arrow E represents the enthalpy of the reaction.
Hence, arrow E represents the enthalpy of the reaction.
Which of these is the scientific name for the organism? Question 1 options: puma concolor
panther
puma
mountain lion
Answer:
All of the above
Explanation:
Panthers, pumas, and mountain lions are all the same animal. Just different names. So, all of these would be correct.
How many moles of copper are equivalent to 3.44 × 1023 atoms of copper?
3.44x10^23 divided by 6.02x10^23 equals 0.571 mol Cu.
Final answer:
To find the number of moles equivalent to 3.44 × 10²³ atoms of copper, you divide the given number of atoms by Avogadro's number, resulting in approximately 0.571 moles of copper.
Explanation:
To calculate the number of moles of copper equivalent to 3.44 × 10²³ atoms of copper, we need to use Avogadro's number, which is approximately 6.02 × 10²³ atoms/mol. This is the number of atoms in one mole of any element.
Here is the step-by-step calculation:
Divide the given number of copper atoms by Avogadro's number to get the number of moles:Therefore, there are roughly 0.571 moles of copper in 3.44 × 10²³ copper atoms.
NaOH + HCl → NaCl + H2O
An instructor is planning to demonstrate this reaction to a class as an example of a neutralization reaction. She does a test run, using NaOH pellets and 1.0 M HCl. The reaction mixture spatters. She concludes that this is unsafe; the reaction rate is too fast. How can she slow it down?
A)
heat the HCl
B)
use 0.2 M HCl
C)
add a catalyst
D)
grind the NaOH pellets to a powder
The correct answer is B).
Answer:
B) use 0.2 M HCl
Explanation:
Lowering the concentration of a reactant will slow down the rate of reaction. If she would use 0.2 M HCl, the reaction rate will be slower than with 1.0 M HCl. The other choices would increase the rate of reaction, making it even more dangerous.
How many moles of aluminum are needed to react completely with 1.2 mol of feo
Answer:
0.80 mol AlExplanation:
1) Word reaction:
Aluminum + ferrous oxide → aluminum oxide + ironThis is a single replacement reaction, in which aluminum, a more acitve metal than iron, replaces the iron in the ferrous oxide to form aluminum oxide and iron.
2) Skeleton chemical equation:
Al + FeO → Al₂O₃ + Fe3) Balanced chemical equation:
Add the coeffcients to comply with the law of conservation of mass:
2Al + 3FeO → Al₂O₃ + 3Fe4) Mole ratio of Al and FeO:
2 mol Al : 3 mol FeO5) Set a proportion with the unkown and solve:
x / 1.2 mol FeO = 2 mol Al / 3 mol FeOx = 1.2 mol FeO × 2 mol Al / 3 mol FeO = 0.80 mol Al ← answerWrite a balanced chemical equation showing how each metal oxide reacts with HCl. SrO Na2O Li2O BaO
Answer:
See below
Explanation:
Each metal oxide reacts with HCl to form water and the metal chloride
[tex]\rm SrO + 2HCl \longrightarrow SrCl_{2} + H_{2}O\\\\Na_{2}O + 2HCl \longrightarrow 2NaCl + H_{2}O\\\\Li_{2}O + 2HCl \longrightarrow 2LiCl + H_{2}O\\\\BaO + 2HCl \longrightarrow BaCl_{2} + H_{2}O[/tex]
Answer:
Generally, metal oxides reacts with hydrochloric acid(HCl) to form the corresponding salts and water
SrO + 2HCl → SrCl2 + H2O
Na2O + 2HCl → 2NaCl + H2O
Li2O + 2HCl → 2LiCl + H2O
BaO + 2HCl → BaCl2 + H2O
Explanation:
Metal oxides are basic in nature .This means they have a high pH value ( >7 ). This is why if they react with acid the product becomes salt and water. Now let us write a balance equation between the following metal oxides and Hydrochloric acid(HCl) as stated in the questions.
SrO + 2HCl → SrCl2 + H2O
The above equation has the reactant at the left hand side and the products at the right hand side. Balancing the equation requires that the number of each element present on the reactant sides need to be equal on the product sides . Sr(strontium) has only one atom(SrO) and one atom of oxygen (SrO) on the reactant side. On the product side, Sr has one atom(SrCl) and one atom of oxygen(H2O). So Sr and O is balanced on both sides. The hydrogen on the product sides has 2 atom and the chlorine has 2 atom too . To balance the 2 atoms with that on the reactant side we add 2 in front of HCl to make hydrogen 2 atoms and chlorine 2 atoms.
Na2O + 2HCl → 2NaCl + H2O
Same method applied to balance the first equation is used here . Make sure every number of atom on the left side is equal to the right sides. The sodium is diatomic on the left and right sides. The oxygen has one atom on both sides .The hydrogen is diatomic on both sides and chlorine is diatomic on both sides. so the equation is balanced.
Li2O + 2HCl → 2LiCl + H2O
The equation is balance here as I added 2 in front of HCl to balance hydrogen and chlorine on both sides. And add 2 in front of LiCl to balance with the diatomic Chlorine and lithium on the reactant side.
BaO + 2HCl → BaCl2 + H2O
I only added 2 to the HCl acid to balance it with what we have on the right sides.
Which is an endothermic process? A. The process in which a substance loses heat energy B. The process in which a substance loses kinetic energy C. The process in which the molecular motion of a substance decreases D. The process in which a substance gains energy
Answer:
D. The process in which a substance gains energy
Explanation:
An endothermic reaction is a reaction in which heat energy is absorbed from the surroundings therefore we can imply that in such reaction, the substances gains energy. In endothermic reactions, the surrounding becomes colder at the end of the changes.
Here, the heat energy level of the final state is higher than that of the initial state. Most dissolution reactions are endothermic in nature. Examples are dissolution of Sodium chloride in water.
Note: it is in exothermic reaction that heat energy is liberated to the surrounding
Answer:
D. The process in which a substance gains energy
Explanation:
Why are chemists great for solving problems?
Because only those with logic (problem solving capabilities) go to chemistry.
Chemists are great for solving problems due to their analytical skills and systematic approach to research.
They have a deep understanding of chemical properties and reactions, which allows them to develop solutions to complex issues. Their training in laboratory techniques equips them to design and conduct experiments effectively.
Chemists can identify and isolate variables, making it easier to pinpoint the root cause of a problem. They also excel in data analysis, interpreting results to draw meaningful conclusions.
Their ability to think critically and creatively helps them devise innovative solutions. Furthermore, chemists are skilled in collaborating with other scientists and professionals, bringing a multidisciplinary approach to problem-solving.
This combination of skills and knowledge makes chemists highly effective in addressing and resolving a wide range of challenges.
Formic acid, hcooh, is a weak acid present in the venom of red-ants. at equilibrium, [hcooh] = 2.00 m, [hcoo− ] = 4.0 × 10− 1 m, and [h3o+ ] = 9.0 × 10− 4 m. __________________
a. write the equilibrium expression for the ionization
Answer:
See below
Explanation:
[tex]\rm HCOOH + H_{2}O \rightleftharpoons H_{3}O^{+} + HCOO^{-}[/tex]
The general formula for an equilibrium constant expression is
[tex]K_{eq} = \dfrac{[\text{Products}]}{[\text{Reactants}]}[/tex]
For this reaction,
[tex]K_{eq} = \dfrac{[\text{HCOO}^{-}][\text{H}_{3}\text{O}^{+}]}{[\text{HCOOH}]}[/tex]
The unique characteristic of the amino acid cysteine is _____.
a high level of acidity
its ability to form hydrogen bonds
its ability to form disulfide bridges a second amino group
Answer:
C. the last one
Explanation:
Cysteine's unique characteristic is its ability to form disulfide bridges, covalent bonds that provide structural stability to proteins. The formation of these bridges is a unique property of cysteine among the amino acids, even though it, like others, can form hydrogen bonds.
Explanation:The unique characteristic of the amino acid cysteine is its ability to form disulfide bridges. These bridges are covalent bonds that provide structural stability to proteins. While cysteine is capable of forming hydrogen bonds like other amino acids, its special characteristic is indeed the formation of these disulfide bridges. Two cysteine residues can come together to form a disulfide bridge, helping to stabilize the three-dimensional structure of the protein. It is notable that hydrogen bonds are weak interactions that occur broadly between many different molecules, but the covalent bonding of disulfide bridges is a unique property of cysteine within the amino acid series.
Learn more about Cysteine here:https://brainly.com/question/32914516
#SPJ2