Answer:
Instrinsic Solubility, Temperature, and Sample Size.
If you had a 0.5 M KCl solution, how much solute would you have in moles, and what would the solute be?
Since KCl has a molecular weight of 74.5, how many grams/L would this be?
Answer:
37.25 grams/L.
Explanation:
Molarity (M) is defined as the no. of moles of solute dissolved per 1.0 L of the solution.M = (no. of moles of KCl)/(volume of the solution (L))
∵ no. of moles of KCl = (mass of KCl)/(molar mass of KCl)
∴ M = [(mass of KCl)/(molar mass of KCl)]/(volume of the solution (L))
∴ (mass of KCl)/(volume of the solution (L)) = (M)*(molar mass of KCl) = (0.5 M)*(74.5 g/mol) = 37.25 g/L.
So, the grams/L of KCl = 37.25 grams/L.
In a 0.5 M KCl solution, there are 0.5 moles of KCl per liter. Given the molecular weight of KCl is 74.5 g/mol, this would translate to 37.25 grams of KCl per liter.
If you have a 0.5 M KCl solution, this means that the concentration of KCl in the solution is 0.5 moles per liter. To find the amount of solute in moles, you would simply use the concentration of the solution and the volume of the solution. In this case, if you have a 1-liter solution, you will have 0.5 moles of KCl, since the concentration is 0.5 M.
To convert this amount in moles to grams, you will need to use the molecular weight of KCl, which is given as 74.5 g/mol. By multiplying the number of moles by the molecular weight, you get the grams of the solute:
0.5 moles × 74.5 g/mol = 37.25 grams of KCl
Therefore, in a 1-liter solution of 0.5 M KCl, you would have 37.25 grams of KCl.
O
Use the periodic table to determine which of the
following could be an isotope of bromine (Br).
Check all that apply.
Z = 79, A = 196
O Z= 35, A= 79
A= 79, N= 44
Z = 44, N= 44
O
DONE
Intro
Answer:
The second and third option are isotopes of Bromine
Z= 35 A = 79
A = 79 N= 44
Explanation:
Step 1: What are isotopes ?
⇒ Elements with same atomic number (Z) ( this means the same number of electrons and protons) but a different number of neutrons (N)
The atomic number (visible on the periodic table) is the number of protons.
The atomic mass is the sum of the protons (Z) and neutrons (N), and is showed as 'A'. So A = Z+N
If we look at the periodic table, we can see that the atomic number of bromine (Z) = 35. This means the amount of protons = 35. Since isotopes have the same amount of protons, all isotopes of bromine, have 35 protons.
1) Z = 79, A = 196
Z = protons = electrons .So this element has 79 protons, as well as 79 electrons.
196 = 79 + N ⇒ N = 196 - 79 = 117 neutrons
⇒Since it doesn't have 35 protons, it isn't an isotope of Bromine, but of Gold (Au): 196Au
2) Z = 35 , A = 79
Z = protons = electrons .So this element has 35 protons, as well as 35 electrons.
79 =35 + N ⇒ N = 79 - 35= 44 neutrons
⇒Since it does have 35 protons, it is an isotope of Bromine. This isotope has 44 neutrons
⇒ This is 79Br, which is a stable isotope of Bromine.
3) A=79, N = 44
Z = A - N ⇒ Z = 79 - 44 = 35
Z = protons = electrons .So this element has 35 protons, as well as 35 electrons. It also has 44 neutrons.
⇒Since it does have 35 protons, it is an isotope of Bromine, with 44 neutrons: 79Br
4) Z = 44, N = 44
Z = protons = electrons .So this element has 44 protons, as well as 44 electrons.
A = 44 + 44 ⇒ A = 88
⇒Since it doesn't have 35 protons, it isn't an isotope of Bromine, but of Ruthenium (Ru) : 88Ru
⇔So the second and third option are isotopes of Bromine
Think of three ways you could safely distinguish between a strong acid and a strong base.
Answer:
--Acid is the substance when dissolved in water, increases the concentration of H+ ions.
--Such compound whose chemical formula begins with H, for example HCl (Hydrochloric acid), H3BO3 (Boric acid), CH2O3 (Carbonic
acid). Although CH3COOH (Acetic acid) is an exception.
--Its less than 7.
--Bases are the proton acceptor.
--Such compounds whose chemical formula ends with OH, for example KOH (Potassium hydroxide), NaOH (Sodium hydroxide).
--Its greater than 7.
Explanation:
One can distinguish between a strong acid and a strong base by using pH paper or a pH meter, observing the reaction in a neutralization process with known substances, and testing the conductivity of the solutions.
Explanation:To distinguish between a strong acid and a strong base, one can use the following three safe methods:
Use pH paper or a pH meter. A strong acid will turn the pH paper red, indicating a pH close to 1-3, while a strong base will turn the paper blue or purple, indicating a pH close to 11-14.Use a neutralization reaction with a known substance. A strong acid will react vigorously with a known strong base, and vice versa, producing water and a salt.Use conductivity testing. Strong acids and bases will both conduct electricity well in solution due to the high concentration of ions, however, by comparing to known standards, one can differentiate between them.It's important to handle all strong acids and bases with proper safety equipment and procedures due to their corrosive nature.
what is the concentration of an NaOH solution that requires 50 mL of a 1.25 M H2SO4 solution to neutralize 78.0 ml of NaOH
Answer:
The answer is the concentration of an NaOH = 1.6 MExplanation:
The most common way to solve this kind of problem is to use the formula
C₁ * V₁ = C₂ * V₂In your problem,
For NaOH
C₁ =?? v₁= 78.0 mL = 0.078 L
For H₂SO₄
C₁ =1.25 M v₁= 50.0 mL = 0.05 L
but you must note that for the reaction of NaOH with H₂SO₄
2 mol of NaOH raect with 1 mol H₂SO₄
So, by applying in above formula
C₁ * V₁ = 2 * C₂ * V₂ (C₁ * 0.078 L) = (2* 1.25 M * 0.05 L)C₁ = (2* 1.25 M * 0.05 L) / (0.078 L) = 1.6 MSo, the answer is the concentration of an NaOH = 1.6 M
Which substance produces hydroxide ions in solution?
O A.
an Arrhenius acid
OB. an Arrhenius base
O c.
a Brønsted-Lowry acid
0
OD. a Brønsted-Lowry base
O E.
0
an amphoteric substance
Answer:
An Arrhenius Base
Explanation:
The definition of this is a base that is a hydroxide ion donor.
A base is a substance that produces hydroxide ions in solutions.
A base that produces hydroxide ions in aqueous solution is also known as: A. Arrhenius bases
An Arrhenius base is a compound that increases the OH− ion concentration in aqueous solution. The reaction between an Arrhenius acid and an Arrhenius base is called neutralization and results in the formation of water and a salt.
What is Arrhenius base give example?An Arrhenius base is a substrate that increases the concentration of hydroxide ions in the aqueous solution. The example for Arrhenius base is highly soluble sodium hydroxide compound in water, which dissociates to give sodium ion and hydroxide ion.
What are examples of Arrhenius acids and bases?Other examples of Arrhenius acids include sulfuric acid (H2SO4), hydrobromic acid (HBr), and nitric acid (HNO3). Examples of Arrhenius bases include sodium hydroxide (NaOH) and potassium hydroxide (KOH).
To learn more about Arrhenius bases, refer
https://brainly.com/question/22759569
#SPJ2
The critical pressure of carbon dioxide is 72.7 atm what is this value in units of pascals
Answer:
7366.328 kPa.
Explanation:
The critical pressure of carbon dioxide is 72.7 atm.To convert from atm to kPa, we use the relation that:1.0 atm = 101.325 kPa.
Applying conversion factor:
The conversion factor = (101.325 kPa/1.0 atm)
∴ The critical pressure of carbon dioxide (in kPa) = (72.7 atm)(101.325 kPa/1.0 atm) = 7366.328 kPa.
Answer:
= 7366.328 kPa.
Explanation:
(72.7 atm)(101.325 kPa/1.0 atm)
= 7366.328 kPa.
Select all the correct answers.
An uncovered pot of water lies out in the sun. Which statements correctly describe what happens at the surface of the liquid water?
The vapor pressure remains constant regardless of the water temperature.
The vapor pressure is produced by water molecules that have evaporated.
The vapor pressure increases as the Sun heats the water in the pot.
Evaporation stops once the vapor pressure reaches a certain point.
Evaporation and condensation both occur on the liquid’s surface.
Answer:
I believe two correct statements are;
The vapor pressure is produced by water molecules that have evaporated.
The vapor pressure increases as the Sun heats the water in the pot.
Explanation:
When an uncovered pot of water lies out in the sun then the vapor pressure is produced by water molecules that have evaporated and increases as the Sun heats.
What is vapor pressure?Vapor pressure is a property of the substance which may change into gaseous state.
When an uncovered pot of water lies out in the sun, then the vapor pressure is produced by the water molecules of the surface phase and they get evaporated. And due to heat transfer by the sun in the form of sunlight vapor pressure of water also increases, which results into more evaporation.
Hence, option (2) and (3) is correct it means vapor pressure increases as the sun heats the water in the pot and they get evaporated.
To know more about vapor pressure, visit the below link:
https://brainly.com/question/25863019
Which one of these is a gas
NaNo3
KL
KCL
NH3
Answer:
nano3 is a solid so its not that one it has to be NH3
Explanation:
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Final answer:
The substance among the given options that is a gas is NH3 or ammonia, as indicated by (g) for gaseous state in the provided reference list.
Explanation:
Among the substances listed — NaNO3, KL, KCL, and NH3 — the one that is a gas is NH3, also known as ammonia. From the reference information provided, NH3 is indicated as NH3(g), where (g) denotes that it is in the gaseous state at standard temperature and pressure. The other substances NaNO3, KL (which seems to be a typo and should likely be KI), and KCL (KCl) are solids as indicated by the (s) in the reference list provided.
NH3 is a common gas known for its pungent odor and is used in various applications, including household cleaning products and fertilizers.
Calculate the number of moles of methane (CH4)needed to produce 7.84 g of water (H2O).
Answer:
0.218 mol.
Explanation:
Firstly, we need to write the balanced reaction:CH₄ + 2O₂ → CO₂ + 2H₂O,
It is clear that 1 mol of CH₄ reacts with 2 mol of O₂ to produce 1 mol of CO₂ and 2 mol of H₂O.
We need to calculate the no. of moles of 7.84 g H₂O:n = mass/molar mass = (7.84 g)/(18.0 g/mol) = 0.436 mol.
Using cross multiplication:
1 mol of CH₄ is needed to produce → 2 mol of H₂O, from stichiometry.
??? mol of CH₄ is needed to produce → 0.436 mol of H₂O.
∴ The no. of moles of CH₄ = (1 mol)(0.435 mol)/(2 mol) = 0.218 mol.
2. A solution is made by adding 1.23 mol of KCl to 1000.0 g of water. Assume that the
density of water (and the resulting solution) is 1.00 g/mL.
a. Calculate the formula weight of KCl.
b. Calculate the mass of KCl in grams.
c. Calculate the percent by mass of KCl in this solution.
d. Calculate the molarity of the solution.
Answer:
a. 74.55 g/mol.
b. 91.70 g.
c. 8.40%.
d. 1.23 mol/L.
Explanation:
a. Calculate the formula weight of KCl.
∵ Formula weight of KCl = atomic weight of K + atomic weight of Cl
atomic weight of K = 39.098 g/mol, atomic weight of Cl = 35.45 g/mol.
∴ Formula weight of KCl = atomic weight of K + atomic weight of Cl = 39.098 g/mol + 35.45 g/mol = 74.548 g/mol ≅ 74.55 g/mol.
b. Calculate the mass of KCl in grams.
we can use the relation:no. of moles (n) = mass/molar mass.
∴ mass of KCl = n*molar mass = (1.23 mol)*(74.55 g/mol) = 91.69 g ≅ 91.70 g.
c. Calculate the percent by mass of KCl in this solution.
The mass % of KCl = (mass of KCl/mass of the solution) * 100.
mass of KCl = 91.70 g,
mass of the solution = 1000.0 g of water + 91.70 g of KCl = 1091.70 g.
∴ The mass % of KCl = (91.70 g/1091.70 g)*100 = 8.399% ≅ 8.40%.
d. Calculate the molarity of the solution.
Molarity is the no. of moles of solute per 1.0 L of the solution.
M = (no. of moles of KCl)/(Volume of the solution (L))
no. of moles of KCl = 1.23 mol,
Volume of the solution = mass of water / density of water = (1000.0 g)/(1.00 g/mL) = 1000.0 mL = 1.0 L.
M = (1.23 mol)/(1.0 L) = 1.23 mol/L.
a. The formula weight of KCl is 74.55 g/mol. b. The mass of KCl in grams is 91.39 g. c. The percent by mass of KCl in the solution is 9.14%. d. The molarity of the solution is 1.23 M.
Explanation:a. The formula weight of KCl (potassium chloride) can be calculated by summing the atomic masses of potassium (K) and chlorine (Cl). The atomic mass of K is 39.10 g/mol and the atomic mass of Cl is 35.45 g/mol. Therefore, the formula weight of KCl is 39.10 g/mol + 35.45 g/mol = 74.55 g/mol.
b. To calculate the mass of KCl in the solution, we need to convert the given amount of KCl in moles to grams. Since 1 mole of KCl has a mass of 74.55 g (as calculated in part a), 1.23 mol of KCl will have a mass of 1.23 mol x 74.55 g/mol = 91.39 g.
c. The percent by mass of KCl in the solution can be calculated by dividing the mass of KCl (91.39 g, as calculated in part b) by the mass of the solution and multiplying by 100%. The mass of the solution is given as 1000.0 g. Therefore, the percent by mass of KCl in the solution is (91.39 g / 1000.0 g) x 100% = 9.14%.
d. The molarity of the solution can be calculated by dividing the number of moles of KCl by the volume of the solution in liters. The number of moles of KCl is given as 1.23 mol and the volume of the solution is 1000.0 g of water, which is equivalent to 1000.0 mL or 1.0000 L. Therefore, the molarity of the solution is 1.23 mol / 1.0000 L = 1.23 M.
What is the scientific notation of 696,000 kilometers
Hello There!
The Answer Is In Image Provided.
Your Unit Is Still Kilometers
When magnesium chloride reacts with water, 5.85)L HCLg is produced. How many moles of HCL is produced
Answer: 650 moles
Explanation: so converted in grams just to make it easy for me, its 5850 g of water right, which is 325 moles of water
so here's the balanced equation
MgCl2 + H20 ==> 2HCl + MgO
thus 1 mole of h20 gives us 2 moles of hcl, so 325 x 2 = 650 moles of hcl
To ensure that the air in the shuttle remains free of excess CO2, engineers test the air-purification system. they combine 1.000 × 103 g LiOH with 8.80 × 1 02 g CO2. The reaction produces 3.25 × 102 g H2O. What is the limiting reactants in this test reaction? What is the theoretical yield of this test reaction?
The
balanced reaction is:
2LiOH + CO2 = Li2CO3 + H2O
We
are given the amount of the reactants to be reacted. This will be the starting point of our
calculations. To determine the limiting reactant, we convert the amounts from grams to moles.
1.000 × 10^3 g LiOH (1 mol / 25.95 g) = 38.54 mol LiOH
8.80 × 10^2 g CO2 ( 1mol / 44.01 g) = 20.00 mol CO2
From the balanced reaction, the molar ratio of the reactants is 2:1. This means that every two mole of lithium hydroxide, 1 mole of carbon dioxide is needed. It is clear that, from the given amounts, CO2 is the limiting reactant.
Answer: The limiting reagent is carbon dioxide and theoretical yield of the reaction is 360 g.
Explanation:
To calculate the number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] .....(1)
For LiOH:Given mass of LiOH = [tex]1.00\times 10^3g[/tex]
Molar mass of LiOH = 23.95 g/mol
Putting values in equation 1, we get:
[tex]\text{Moles of LiOH}=\frac{1.00\times 10^3g}{23.95g/mol}=41.75mol[/tex]
For carbon dioxide:Given mass of carbon dioxide = [tex]8.8\times 10^2g[/tex]
Molar mass of carbon dioxide = 44 g/mol
Putting values in equation 1, we get:
[tex]\text{Moles of carbon dioxide}=\frac{8.8\times 10^2g}{44g/mol}=20mol[/tex]
The chemical equation for the reaction of lithium hydroxide and carbon dioxide gas follows:[tex]2LiOH(s)+CO_2(g)\rightarrow Li_2CO_3(s)+H_2O(l)[/tex]
By Stoichiometry of the reaction:
1 moles of carbon dioxide reacts with 2 moles of lithium hydroxide.
So, 20 moles of carbon dioxide will react with = [tex]\frac{2}{1}\times 20=40mol[/tex] of lithium hydroxide.
As, given amount of lithium hydroxide is more than the required amount. So, it is considered as an excess reagent.
Thus, carbon dioxide is considered as a limiting reagent because it limits the formation of product.
By Stoichiometry of the reaction:
1 mole of carbon dioxide produces 1 mole of water
So, 20 moles of carbon dioxide will produce = [tex]\frac{1}{1}\times 20=20moles[/tex] of water
Now, calculating the theoretical yield of water from equation 1, we get:Molar mass of water = 18 g/mol
Moles of water = 20 moles
Putting values in equation 1, we get:
[tex]20mol=\frac{\text{Mass of water}}{18g/mol}\\\\\text{Mass of water}=360g[/tex]
Hence, the limiting reagent is carbon dioxide and theoretical yield of the reaction is 360 g.
Select the correct answer. Which of the following tests could be safely used to distinguish a strong base from a weak base? A. taste B. touch C. litmus paper D. electrical conductivity
Answer: Option (D) is the correct answer.
Explanation:
Bases are the substances that release hydroxide ions when dissolved in water.
A strong base will dissociate completely in water and give more number of hydroxide ions [tex](OH^{-})[/tex]. Whereas a weak base will slightly dissolve to give hydroxide ions [tex](OH^{-})[/tex] in water.
So, a strong base will have high electrical conductivity and a weak base will have low electrical conductivity.
Since, both are bases (strong base and weak base) therefore, both of them will have bitter taste, slippery texture and they will turn red litmus into blue.
Hence, we can conclude that electrical conductivity tests could be safely used to distinguish a strong base from a weak base.
Litmus paper tests could be safely used to distinguish a strong base from a weak base. The correct answer is C.
To distinguish a strong base from a weak base, one can use litmus paper as a safe and effective method. Litmus paper is a pH indicator that changes color in response to the acidity or basicity of a solution.
When a strong base, such as sodium hydroxide (NaOH), comes into contact with litmus paper, it will cause a dramatic color change, typically from red to blue in the case of blue litmus paper.
This is because strong bases have a high concentration of hydroxide ions (OH-) and can rapidly accept protons (H+), leading to a significant increase in pH.
On the other hand, a weak base, such as ammonia (NH3), will also cause a color change but to a lesser extent or more slowly, reflecting its lower ability to accept protons compared to a strong base.
The pH change will be less dramatic, and the color change on the litmus paper may be less pronounced or take longer to occur.
The other options are not suitable for distinguishing between strong and weak bases:
A. Taste -
Tasting chemicals is extremely dangerous and should never be done. It does not provide a safe method to distinguish between strong and weak bases.
B. Touch -
While some bases may feel slippery or soapy to the touch due to the formation of soap-like substances when they react with oils on the skin, this method is not safe and does not provide a clear distinction between strong and weak bases.
D. Electrical conductivity -
Both strong and weak bases can conduct electricity if they are ionic and dissociate into ions in solution. Therefore, electrical conductivity cannot be used to distinguish between the strength of bases.
In summary, litmus paper is the safest and most reliable method among the options provided to distinguish a strong base from a weak base based on the degree of color change and the speed of the reaction.
3.00 moles of helium gas (He) are in a container with a volume is 2.00 liters and a temperature is at 298 K. What is the approximate pressure in kilopascals?
Answer:
3718.628 kPa.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm (P = ??? atm).
V is the volume of the gas in L (V = 2.0 L).
n is the no. of moles of the gas in mol (n = 3.0 mol).
R is the general gas constant (R = 0.0821 L.atm/mol.K),
T is the temperature of the gas in K (T = 298.0 K).
∴ P = nRT/V = (3.0 mol)(0.0821 L.atm/mol.K)(298.0 K)/(2.0 L) = 36.7 atm.
To convert from atm to kPa:
∵ 1.0 atm = 101.325 kPa.
∴ P = (36.7 atm)(101.325 kPa/1.0 atm) = 3718.628 kPa.
Which of the following is used in pencils?
A. Graphite
B. Silicon
C. Charcoal
D. Phosphorous
Which of the following metals forms an amalgam with other metals?
A. Tin
B. Mercury
C. Lead
D. Zinc
Answer:
1st answer: A. Graphite
2nd answer: B. Mercury
Explanation:
The climate of a place also depends upon the amount of water in the air. How do the rising temperatures around Earth affect the amount of water in the air? A) The water in the air evaporates because the temperature of air is rising. B) There is more water in the air because the rate of evaporation increases. C) The water in the air decreases because the water on Earth starts evaporating. D) There is less water in the air because the evaporated water falls down as rain.
Answer:
B) There is more water in the air because the rate of evaporation increases
Explanation:
As the temperatures rise across the globe, the rate of evaporation also increases, resulting in more water in the air. The reason for the increased evaporation is that the ice sheets and glaciers are melting, thus there's more liquid water. The more liquid water there is, the more evaporation there will be. As the evaporation increases, there will be an increase in the formation of clouds, thus there will be more precipitation around the world, gradually leading to warmer and wetter climate.
Practice Explaining Heat Flow
Examine the image showing a pan of boiling
eggs on a gas burner. What is the path of heat
flow?
a) hot gas - pan -> eggs - water
b) pan ->hot gas - eggs > Water
c) burning gas - pan -* water - eggs
d) eggs — water - burner - pan
e) pan - water - eggs - burner
Dona
Answer:
The right choice is "burning gas → pan → water → eggs"
Explanation:
Heat will flow from the body of higher temperature to the cooler body.
So, heat will firstly flow from burning gas to pan by conduction then to the water in contact with pan then to the egg present inside the water.
So, the right choice is :
"burning gas → pan → water → eggs"
Answer: Option (c) is the correct answer.
Explanation:
When two objects of different temperature come in contact with each other then heat will flow from hot object to cold object. This process of transfer of heat is known as conduction.
For example, a pan of boiling eggs on a gas burner will have transfer of heat from gas burner to the pan and then heat will flow from water to the eggs.
This process is also a conduction process.
Thus, we can conclude that the path of heat flow will be as follows.
[tex]\text{burning gas} \rightarrow \text{pan} \rightarrow \text{water} \rightarrow \text{eggs}[/tex]
How many miles of beryllium chloride BeCl2 are needed to make 130 ml of a 0.025 M solution
Answer:
= 0.00325 moles of beryllium
Explanation:
Molarity or concentration is given by the formula;
Molarity = Number of moles/Volume in L
Therefore, to get the number of moles
Moles = Molarity × Volume
= 0.025 M × 0.13 L
= 0.00325 moles of beryllium
if .40 L if water is added to the volume of cup 3, what would be the new molarity of a 2 M solution of kool-aid
Answer:
0.7692 M ≅ 0.77 M.
Explanation:
It is known that the no. of millimoles of a solution before dilution is equal to the no. of millimoles of the solution after the dilution.It can be expressed as:(MV) before dilution = (MV) after dilution.
M before dilution = 2.0 M, V before dilution = 0.25 L.
M after dilution = ??? M, V after dilution = 0.25 L + 0.40 L = 0.65 L.
∴ M after dilution = (MV) before dilution/(V) after dilution = (2.0 M)(0.25 L)/(0.65 L) = 0.7692 M ≅ 0.77 M.
a gas at pressure 4.4 atm and 32.14 L has a new volume of 72 L, what is the new pressure
Answer:
[tex]\boxed{\text{2.0 atm}}[/tex]
Explanation:
If the temperature is constant, the only variables are pressure and volume, so we can use Boyle’s Law.
p₁V₁ = p₂V₂
Data:
p₁ = 4.4 atm; V₁ = 32.14 L
p₂ = ?; V₂ = 72 L
Calculation:
4.4 × 32.14 = p₂ × 72
141 = 72p₂
[tex]p_{2} = \dfrac{141}{72} = \textbf{2.0 atm}[/tex]
The new pressure is [tex]\boxed{\textbf{2.0 atm}}[/tex]
How to make slime without glue or cornstarch
Hopefully this is close to what you looking for
One way :
-Dawn soap
-some water
-Salt crystals
-Put in freezer for a few hours
-StarGaze
(if this doesn't work comment)
I suggest using a little bit first, to see if it works for you.
A chemical process dissolves 500 milligrams of iron oxide every 20 minutes. How long would it take this reaction to dissolve 2 lbs of iron oxide?
Answer:
[tex]\boxed{\text{25 da}}[/tex]
Explanation:
Step 1. Convert pounds to milligrams
(a) Pounds to grams
[tex]\text{Mass} = \text{2 lb} \times \dfrac{\text{454 g}}{\text{1 lb}} = \text{910 g}[/tex]
(b) Grams to milligrams
[tex]\text{Mass} = \text{910 g} \times \dfrac{\text{1000 mg}}{\text{1 g}} = \text{910 000 mg}[/tex]
Step 2. Calculate the time
(a) Milligrams to minutes
[tex]t = \text{910 000 mg}} \times \dfrac{\text{20 min}}{\text{500 mg}} = \text{36 000 min}[/tex]
(b) Minutes to hours
[tex]t = \text{36 000 min} \times \dfrac{\text{1 h}}{\text{60 min}} = \text{610 h}[/tex]
(c) Hours to days
[tex]t = \text{ 610 h} \times \dfrac{\text{1 da}}{\text{24 h}} = \text{25 da}[/tex]
It will take [tex]\boxed{\textbf{25 da}}[/tex]to dissolve the iron oxide.
Answer : The time taken for the reaction is 36363.64 minutes.
Explanation :
First we have to convert the mass of iron oxide from milligram to pounds (lbs).
[tex]1\text{ lbs}=453592mg[/tex]
or,
[tex]1mg=\frac{1}{453592}\text{ lbs}[/tex]
As, [tex]1mg=\frac{1}{453592}\text{ lbs}[/tex]
So, [tex]500mg=\frac{500mg}{1mg}\times \frac{1}{453592}\text{ lbs}=0.0011\text{ lbs}[/tex]
Now we have to calculate the time taken for the reaction.
As, [tex]0.0011\text{ lbs}[/tex] of iron oxide take time = 20 minutes
As, [tex]2\text{ lbs}[/tex] of iron oxide take time = [tex]\frac{2\text{ lbs}}{0.0011\text{ lbs}}\times 20\text{ minutes}=36363.64\text{ minutes}[/tex]
Therefore, the time taken for the reaction is 36363.64 minutes.
A reaction has ∆H = −356 kJ and ∆S = −36 J/K. Calculate ∆G (kJ) at 25°C.
Answer: -345.2 KJ
Explanation: As we know that ,dG=dH-TdS
T=25+273=298 K
dG= -356 x1000-298(-36)= -356000+10728
=-345272 j
= -345.2 KJ
a lithium atom has three electrons.A fluorine has 9 protons and 9 electrons,with 7 electrons in its outer energy level.Using a diagram,explain how an atom of lithium an an atom of fluorine combine by ionic bonding
The lithium atom provides the fluorine atom with one electron making both atoms stable. Fluorine has a better positive charge than lithium so fluorine will attract the electron. Now, the atoms fuse together to form an ionic bond and making lithium fluoride. Ionic bonds are caused by the attraction between two forces of atoms.
Answer:
The lithium atom has one electron in its outer shell, so it loses that one electron and becomes a [tex]Li^{1+}[/tex] ion. The fluorine atom has 7 electrons in its outer shell so it gains that one electron and becomes a [tex]F^{1-}[/tex] ion. The electrostatic force of attraction between the two ions, because of their charges, bonds them together in an ionic bond to make [tex]LiF[/tex], Lithium Fluoride.
Couldn't add a diagram, but hope it helps.
Natural resources like oil and copper metal take a very long time to form. Because of this, they are known as A) fossil fuels. B) vital resources. C) renewable resources. D) non-renewable resources.
Answer:
d) non-renewable resources
Explanation:
A natural resource such as coal, gas, or oil that, once consumed, cannot be replaced. Most energy resources currently in use are non-renewable while the renewable ones (such as wind and solar power) are not well developed. Also called depletable resource.
Answer: Non renewable resources.
Explanation: The non renewable resources can be defined as the resources that once used cannot be replenished. The resources like oil and copper takes very long time to form and this makes it non-renewable.
The natural resources like oil takes a long time to form inside the ocean and its extraction is also done after long time because its formation takes time.
A compressor takes 0.50 m3 of a gas at 33°C and 760 mmHg and compresses it to 0.10 m3, cooling it to -55°C at the same time. What is the pressure of the gas at these new conditions? 3.7 x 10-4 mmHg 68 mmHg 2,700 mmHg 1.0 mmHg
Answer:
2,700 mmHg.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
If n is constant, and have two different values of V, P and T:P₁V₁T₂ = P₂V₂T₁
P₁ = 760 mmHg, V₁ = 0.50 m³, T₁ = 33°C + 273 = 306.0 K.
P₂ = ??? mmHg, V₂ = 0.10 m³, T₂ = - 55°C + 273 = 218.0 K.
∴ P₂ = P₁V₁T₂/V₂T₁ = (760 mmHg)(0.50 m³)(218.0 K)/(0.10 m³)(306.0 K) = 2707.0 mmHg ≅ 2,700 mmHg.
Answer:
2,700 mmHg.
Explanation:
A material has a volume of 63.0 cm3 and a mass of 28 grams. What is the density of the material in g/cm3 to the correct number of significant figures?
Answer:
0.4444 g/cm³ ≅ 0.44 g/cm³ (2 significant figures).
Explanation:
Knowing that:d = m/V,
where, d is the density of the material (g/cm³).
m is the mass of the material (m = 28 g).
V is the volume of the material (V = 63.0 cm³).
∴ d = m/V = (28 g)/(63.0 cm³) = 0.4444 g/cm³ ≅ 0.44 g/cm³ (2 significant figures).
What is the mass in grams of 0.000142 mole of vitamin C
Answer:
0.16 rounded
Explanation:
I used a calculator to get this answer, one that compared grams and mol.
The mass of 0.000142 mole of vitamin C is approximately 0.025 grams. This is derived by multiplying the number of moles by the molar mass of vitamin C, which is 176.124 g/mol.
The mass in grams of 0.000142 mole of vitamin C can be calculated by using the formula:
Mass (grams) = number of moles x molar mass (g/mol)
Calculating the Mass of Vitamin C
We have 0.000142 mole of vitamin C, and the molar mass of vitamin C (ascorbic acid) is 176.124 g/mol. By multiplying these values, we get:
Mass = 0.000142 moles x 176.124 g/mol = 0.025010168 grams
Therefore, the mass of the recommended daily dietary allowance of vitamin C for children aged 4-8 years is approximately 0.025 grams.
14. Which of the following is an example of an epeirogenic process?
O
O A. A rift valley forms at a divergent boundary where two plates are stretched apart.
B. A large plateau forms in the interior of a continental plate when a large section of the plate rises evenly due to an even expansion of the underlying mantle
O C. Mountains form along a convergent plate boundary when two plates collide, causing rock to bunch and buckle upward
O D. Mountains form along a convergent plate boundary when an oceanic plate slips beneath a continental plate, resulting in an upward force on the continental plate
Answer:
A large plateau forms in the interior of a continental plate when a large section of the plate rises evenly due to an even expansion of the underlying mantle. B.
Answer: Option (A) and (D)
Explanation: Epeirogenic process refers to the uplifting and sinking of the continental crust. It is the vertical movement of the crust due to certain mechanisms. Divergent movement of the plates leads to the thinning of the crust and in the convergent plate boundary between a continent and oceanic plate, creates an accretionary wedge that increases the vertical height of the crust. It is not related to the continental collision and plateaus are the stable part of the continent where there is not much change in the thickness of the crust.
Thus the correct answers are (A) and (D)