Answer: atomic number Z, gives the proton number of an element and it is unique for all elements ( i.e no two elements have the same atomic number or proton number) if the atom of the element is electrically neutral, the atomic number can also be the electron number
Explanation:
A radio station's channel, such as 100.7 FM or 92.3 FM, is actually its frequency in megahertz (MHz), where 1MHz=106Hz and 1Hz=1s−1. Calculate the broadcast wavelength of the radio station 91.10 FM. Express your answer to four significant figures and include the appropriate units.
Answer:
3.293 m
Explanation:
Data Given:
Frequency of radio wave = 91.10 FM or 91.10 MHz
1 MHz = 10⁶ Hz
1 Hz = 1 s⁻¹
wavelength = ?
Solution:
As Frequency of radio wave is 91.10 FM or 91.10 MHz
if we look for conversion of MHz to Hz
So,
1 MHz = 10⁶ Hz
91.10 MHz = (91.10)(10⁶) = 91.1 x 10⁶ Hz
So
91.10 MHz = 91.1 x 10⁶ Hz
Now we look for conversion of Hz to s⁻¹
1 Hz = 1 s⁻¹
91.1 x 10⁶ Hz = 91.1 x 10⁶ s⁻¹
So
91.1 x 10⁶ Hz = 91.1 x 10⁶ s⁻¹
Now equation used to calculate wavelength
f = c/λ
rearrange the above equation
λ = c/f ........(1)
Where:
c = speed of light = 3 x 10⁸ ms⁻¹
λ= wavelength
put the values in above equation 1
λ = 3 x 10⁸ ms⁻¹ / 91.1 x 10⁶ s⁻¹
λ = 3.293 m
So the wavelength of radio station wave = 3.293 m
Lucia drew a diagram to compare animal cells and plant cells. Which label belongs in the area marked Y?
Answer:
Golgi body
Explanation:
Answer:
cell wall i think
Explanation:
i think because bacteria dont have a cell wall
Can someone answer this for me please
Answer: B. Heat from the lemonade moved into the ice
Explanation: The concept of heat flow is explains that heat always move from higher temperature to lower temperature. So the heat in the lemonade moves into the ice until they attain thermal equilibrium or equal temperature.
Which of the following will most likely happen if the pancreas does not produce sufficient glucagon?
1. Blood sugar will decrease because glucagon increases blood sugar when it falls too low.
2. Blood sugar will increase because glucagon increases blood sugar when it falls too low.
3. Blood sugar will decrease because glucagon lowers blood sugar when it rises too high.
4. Blood sugar will increase because glucagon lowers blood sugar when it rises too high.
Answer:
1. Blood sugar will decrease because glucagon increases blood sugar when it falls too low.
What tool would you need discover whether a mineral has fracture?
A. A hammer incorrect answer
B. A file incorrect answer
C. A grinder incorrect answer
D. A harder mineral
Answer:
D
Explanation:
We in same class
Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, the correct option is option A.
What is matter?Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.
Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.
So as we saw that matter has some mass so mass can be measured in gram only. Mass can also be represented as number of molecules. We also saw that matter occupy some volume and that volume is measured only in liter. To determine cleavage and fracture, rock hammer is used.
Therefore, the correct option is option A.
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What is the net ionic equation for the precipitation reaction between BaCl2 and Na2So4? I know the answer ( Ba2+(aq) + SO42-(aq) --> BaSO4 (S) ), but i dont understand how it is the answer. Can anybody help? <3
Answer:
Ba²⁺(aq) + SO₄²⁻(aq) → BaSO₄(s)
Explanation:
Chemical equation:
BaCl₂ + Na₂SO₄ → BaSO₄ + NaCl
Balanced Chemical equation:
BaCl₂(aq) + Na₂SO₄(aq) → BaSO₄(s) + 2NaCl(aq)
Ionic equation:
Ba²⁺(aq) + 2Cl⁻(aq) + 2Na⁺(aq) + SO₄²⁻(aq) → BaSO₄(s)+ 2Na⁺(aq) + 2Cl⁻ (aq)
Net ionic equation:
Ba²⁺(aq) + SO₄²⁻(aq) → BaSO₄(s)
The Na⁺ (aq) and Cl⁻(aq) are spectator ions that's why these are not written in net ionic equation. The barium sulfate is present in solid form that's why can not be splitted into ions.
Spectator ions:
These ions are same in both side of chemical reaction. These ions are cancel out. Their presence can not effect the equilibrium of reaction that's why these ions are omitted in net ionic equation.
what ions are released when water is mixed with a base?
Answer:
When dissolved in water, acids donate hydrogen ions (H+). Hydrogen ions are hydrogen atoms that have lost an electron and now have just a proton, giving them a positive electrical charge. Bases, on the other hand, mixed with water yield hydroxide ions (OH-).
Many things can cause an organism to become extinct. Here are some possible causes of extinction. Select the human causes of extinction.
Question 7 options:
Global warming
Pollution
Habitat destruction
Disease
i will give brainiest answer to the right person.
Water is made of two hydrogen atoms and one oxygen atom bonded together. Julia is describing how water undergoes a physical change when it boils. She says that the particles shift to be farther apart and that the oxygen and hydrogen separate. She also says that the total mass of the steam is the same as the initial water, and that heat energy was required to cause the change. She finishes her description by saying that the steam can be turned back into water if it is cooled.
Which is the mistake in her description?
1 .The total mass remains the same in physical changes.
2.The arrangement of particles may change in physical changes.
3.Atoms remain bonded to each other in physical changes.
4.Energy changes may occur in physical changes.
During an experiment, 321.1 grams of strontium phosphite are measured into a beaker. How many moles of strontium phosphite are in the beaker?
The number of moles of strontium phosphite in a 321.1-gram sample is calculated by dividing the mass by the molar mass of strontium phosphite. The molar mass is found using the molecular formula Sr3(PO3)2 and the atomic masses from the periodic table.
Explanation:To calculate the number of moles of strontium phosphate from 321.1 grams, we must first know its molar mass, which can be calculated using the periodic table. Once we have the molar mass, we can divide the mass of the strontium phosphate by this number to find the moles.
The formula for strontium phosphate is Sr3(PO3)2. We can calculate the molar mass as follows: (Sr: 87.62 g/mol * 3) + (P: 30.97 g/mol * 2) + (O: 16.00 g/mol * 6) = 452.34 g/mol. Then we use this molar mass to find the number of moles:
Moles of strontium phosphite = 321.1 g / 452.34 g/mol To answer the question accurately, perform the division to obtain the moles, which will be expressed in three significant figures. This approach is similar to how you would calculate moles for other substances by using their respective molar mass.
Rewrite this measurement with a simpler unit, if possible.
8.3 kg•m^2/ s^2
Final answer:
The measurement 8.3 kg·m^2/s^2 can be rewritten as 8.3 joules (J), as 1 kg·m^2/s^2 is equivalent to 1 joule.
Explanation:
The measurement 8.3 kg·m^2/s^2 can be simplified to a simpler unit which is the joule (J). In physics, the unit of energy, work, and heat is the joule, and it is defined as 1 kg·m^2/s^2. Hence, the given measurement of 8.3 kg·m^2/s^2 is equal to 8.3 joules (J). The measurement 8.3 kg·m^2/s^2 can be simplified to a simpler unit which is the joule (J). In physics, the unit of energy, work, and heat is the joule, and it is defined as 1 kg·m^2/s^2.The measurement 8.3 kg·m^2/s^2 can be simplified to a simpler unit which is the joule (J). In physics, the unit of energy, work, and heat is the joule, and it is defined as 1 kg·m^2/s^2. Hence, the given measurement of 8.3 kg·m^2/s^2 is equal to 8.3 joules (J). This conversion is based on the fact that energy (E) can be expressed in terms of mass (m), the acceleration due to gravity (g), and height (h) in the equation E = mgh, with g typically approximated as 10 m/s^2 for convenience. Hence, the given measurement of 8.3 kg·m^2/s^2 is equal to 8.3 joules (J). This conversion is based on the fact that energy (E) can be expressed in terms of mass (m), the acceleration due to gravity (g), and height (h) in the equation E = mgh, with g typically approximated as 10 m/s^2 for convenience.The measurement 8.3 kg·m^2/s^2 can be simplified to a simpler unit which is the joule (J). In physics, the unit of energy, work, and heat is the joule, and it is defined as 1 kg·m^2/s^2. Hence, the given measurement of 8.3 kg·m^2/s^2 is equal to 8.3 joules (J). This conversion is based on the fact that energy (E) can be expressed in terms of mass (m), the acceleration due to gravity (g), and height (h) in the equation E = mgh, with g typically approximated as 10 m/s^2 for convenience.This conversion is based on the fact that energy (E) can be expressed in terms of mass (m), the acceleration due to gravity (g), and height (h) in the equation E = mgh, with g typically approximated as 10 m/s^2 for convenience.
Isotopic notation of phosphorus-29
Isotopic notation of phosphorus-29 is [tex]_{15} ^{29} P[/tex]
Explanation:
Isotopes are atoms with equal number of protons but different number of neutrons at its nucleus. The isotopic notation for any element can be written as [tex]_{Z} ^{A} X[/tex] where X represents the chemical symbol ,A represents mass number and Z represents atomic numberThe atomic number for phosphorus is 15 Isotope's mass number for phosphorus-29 is 29 The chemical symbol for phosphorus is P Hence Isotopic notation is [tex]_{15} ^{29} P[/tex]Number of neutrons = 29-15 =14 Number of protons=atomic number =15When 25.0 grams of FeO react with 25.0 grams of Al, how many grams of Fe can be produced?
FeO + Al - Fe + Al2O3(need balance equation)
1) 25.9 g Fe
2) 38.7 g Fe
3) 50.9 g Fe
4) 77.6 g Fe
Answer: 77.7g
Explanation:Please see attachment for explanation
The correct answer of given question is (4) 77.6 g Fe.
- First, balance the chemical equation:
[tex]2 FeO + 2 Al \rightarrow 2 Fe + Al_2O_3[/tex]
- Calculate the molar masses:
- FeO: 55.85 (Fe) + 16.00 (O) = 71.85 g/mol
- Al: 26.98 g/mol
- Fe: 55.85 g/mol
- Find the limiting reactant:
- Moles of FeO = Mass of FeO / Molar mass of FeO = 25.0 g / 71.85 g/mol = 0.348 moles
- Moles of Al = Mass of Al / Molar mass of Al = 25.0 g / 26.98 g/mol = 0.926 moles
- From the balanced equation, 1 mole of FeO produces 1 mole of Fe, and 2 moles of Al are needed to react with 2 moles of FeO.
- The limiting reactant is FeO because it produces fewer moles of product compared to Al.
- Calculate the moles of Fe produced:
- Since FeO is the limiting reactant, the moles of Fe produced are equal to the moles of FeO, which is 0.348 moles.
- Convert moles of Fe to grams:
- Mass of Fe = Moles of Fe × Molar mass of Fe = 0.348 moles × 55.85 g/mol = 19.44 g
Complete Question:
When 25.0 grams of FeO react with 25.0 grams of Al, how many grams of Fe can be produced?
1) 25.9 g Fe
2) 38.7 g Fe
3) 50.9 g Fe
4) 77.6 g Fe
The diagram shows the movement of particles from one end of the container to the opposite end of the container. A cylindrical container is shown sealed at the top and bottom, with a solid layer with one small hole in it in the middle. The top part of the container has many small balls in it; the bottom part has only 4 balls. Arrows point down through the hole in the center layer. Which event is most likely occurring? diffusion because particles move from regions of high concentration to regions of low concentration diffusion because particles move from regions of low concentration to regions of high concentration effusion because there is a movement of a gas through a small opening into a larger volume effusion because there is a movement of a gas through a large opening into a smaller volume
Answer:
C. effusion because there is a movement of a gas through a small opening into a larger volume
Explanation:
Effusion makes fluid/gas molecules move to the container with less pressure or larger volume. In diffusion, the movement should work two ways even though one side might receive more. But in effusion, the movement is rather one way.
This case shows how effusion work because its not the concentration that makes the balls moving to the bottom part of the container. No ball moving from bottom container to top either.
Answer:
C. effusion because there is a movement of a gas through a small opening into a larger volume
Explanation:
got it right on edg
which of the following atoms has the larhest atomic radius na k mg ca
Explanation:
Atomic size
in is defined as size of on atom or distance from nucleus to outermost shell of an atom.
ALONG GROUP --> it increases.
For example:- Consider 1st group
Li – 3 2,1 K,L
Na- 11 2,8,1 K, L, M
K- 19 2, 8, 8, 1 K,L, M, N
As we move down the group. , every time a new shell is being added due to which size of an atom increases.
Along period - it decreases.
For example:- consider 3rd period
Na Mg Ar Si
2,8,1 2,8,2 2,8,3 2,8,4
We see every time, a new electron is added to the same shell due to which nuclear charge increases and size decreases.
That is the reason ,In the above asked question : out of all K is bigger .
Among the given atoms Na, K, Mg, Ca, K (potassium) has the largest atomic radius because it falls furthest down the periodic table, resulting in more electron shells and a larger radius.
Explanation:The atomic radius of an atom is determined by the number of energy levels that it possesses, which are quantified by the atom's period number on the periodic table. In this case, all four atoms given (Na, K, Mg, Ca) lie in the same period. However, as you move down the periodic table, the atomic radius increases. This is due to the addition of electron shells. Among the given atoms, K (potassium) falls furthest down the periodic table. Therefore, K (potassium) has the largest atomic radius among these four elements.
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PLEASE HELP
The average kinetic energy of the particles in a substance is directly proportional to the
A molar mass of the substance
B Fahrenheit temperature
C Kelvin temperature
D Celsius temperature
A: Molar Mass
Because the mass is distributed along a specific matter, depending on the kinetic energy used, it will directly be connected to the atoms mass
Allen wants to make a box to keep foods hot. What material would be best for him to use in his box?
A.
glass
B.
stainless steel
C.
rubber
D.
aluminum foil
Answer:my answer is correct
Explanation:
The box has been used to keep the food hot has been a bad conductor of heat. The heat has been entrapped within the box that helps for the food to keep hot.
The material used for the box to keep the food hot has been rubber. Thus, option C is correct.
Material to keep food hotThe conductor is the materials that has been able to transfer the energy. The insulators are the materials that do not allow the transfer of energy.
The metals have been considered as good conductor of energy. Thus, with the use of stainless steel, aluminum foil, or even glass results in the transfer of energy from food to the environment resulting in cooling the food.
The rubber has been a bad conductor of energy and is a good insulator. It has been able to entrap the heat energy in the box and keeps the food hot. Thus, option C is correct.
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In a classroom, which comparison would a teacher most likely use for describing a mole?
Answer:
In a classroom, the comparison that a teacher would most likely use for describing a mole is: jar of jellybeans and a gram of salt crystals.
Explanation:
How many molecules are in 0.0124 mol of CH2O
There are 0.0747×[tex]10^{23}[/tex] molecules in 0.0124 moles of [tex]C H_{2} O[/tex].
Explanation:
We know that 1 mole of any element is equal to Avagadro's number of molecules present in that element. So in this case, it is stated that 0.0124 moles of [tex]C H_{2} O[/tex] is present. Then the number of molecules will be obtained by multiplying the number of moles with Avagadro's number.
No. of molecules = No.of moles × Avagadro's number
No.of molecules = 0.0124×6.022×[tex]10^{23}[/tex] molecules =0.0747×
Thus, 0.0747×[tex]10^{23}[/tex] molecules of [tex]C H_{2} O[/tex] are present in 0.0124 moles of [tex]C H_{2} O[/tex].
Order the theories from oldest to most recent.
1 Electrons move about a positively charged nucleus in clouds that are defined by probabilities.
2 Atoms are tiny indivisible particles that make up all mater.
3 Atoms consist of mostly empty space with a dense nucleus of positive charge.
4 Negatively charged electrons are embedded in a mass of positive charge. 5 Electrons occupy specific energy levels surrounding a positively charged nucleus.
Answer:
Explanation:
The following are the order of point from oldest to most recent
1. Atoms are tiny indivisible particles that make up all mater.
it is Postulate of Dalton's atomic theory. this theory was put forward in 1803
2. Negatively charged electrons are embedded in a mass of positive charge.
In 1897 J.J Thomson discovered that atom consist of tiny negatively charged particles called electrons that are uniformly spread in +vely charged matrix this model called as plum pudding model.
3. Atoms consist of mostly empty space with a dense nucleus of positive charge.
While doing experiment on gold foil Rutherford presented a model in 1909 and stated that atom consist mostly empty space with dense nucleus.
4. Electrons occupy specific energy levels surrounding a positively charged nucleus.
Niels Bohr in 1913 put forward a model to explain atomic orbitals/energy level. This is a postulate of Bohr model.
5. Electrons move about a positively charged nucleus in clouds that are defined by probabilities.
In 1926 Erwin Schrödinger explain the wave function of electrons and its probability.
The absolute temperature of a gas is increased four times while maintaining a constant volume. What happens
pressure of the gas?
It decreases by a factor of four.
It increases by a factor of four.
it decreases by a factor of eight.
o tincreases by a factor of eight.
Answer:
It increases by a factor of four
Explanation:
Boyle's Law : At constant temperature , the volume of fixed mass of a gas is inversely proportional to its pressure.
pV = K.......(1)
pV = constant
Charles law : The volume of the gas is directly proportional to temperature at constant pressure.
V = KT
or V/T = K = constant ....(2)
Applying equation (1) and (2)
[tex]\frac{PV}{T}=K[/tex]
[tex]\frac{P_{1}V_{1}}{T_{1}}=\frac{P_{2}V_{2}}{T_{2}}[/tex]
According to question ,
T2 = 4 (T1)
V2 = V1
Put the value of T2 and V2 , The P2 can be calculated,
[tex]\frac{P_{1}V_{1}}{T_{1}}=\frac{P_{2}V_{1}}{4T_{1}}[/tex]
V1 and V1 cancel each other
T1 and T1 cancel each other
We get,
[tex]P1=\frac{P2}{4}[/tex]
or
P2 = 4 P1
So pressure increased by the factor of four
Answer:
b
Explanation:
on edge
What’s the distance from the nucleus of an atom to its theoretical outer edge of electron orbits
Answer:
The range of atoms = (30-300 pm) depending upon the element
Explanation:
The Atomic radii of the atom is the distance from the center of the circle to the outermost orbital.
The center of the circle is the nucleus and the radii is the outermost boundary.
The actual size of the atom is decided on the basis of the Zeff . Also known as effective nuclear charge.
Zeff: It is the net positive charge felt by the outermost electron by the nucleus.
The value of Zeff depends upon the shielding constant. More the shielding less will be the Zeff . Hence the size of the atom increases.
Due to shielding the outermost electrons feel less pull of nucleus.
The greater the Zeff , the smaller the radius of the atom.
The formula used to calculate the atomic mass is :
[tex]r_{n}=\frac{52.9n^{2}}{Z}[/tex]pm
Here "pm"= picometers
[tex]1 pm = 10^{-12}m[/tex]
The size of the smallest atom H-atom = 120 pm
The range of atoms = (30-300 pm)
What observations can you make about the valence electrons in the following columns of the periodic table?
-Column 1:
-Column 2:
-Transition Metal Columns:
-Columns 3–7:
-Column 8:
Answer:
Column 1. They have one valence electron
Column 2. They have 2 valence electrons
Transition metal column. Variable oxidation states
Column 3–7. Valence electron ranges from 3 to 7 electrons
Column 8. Completely filled i.e no valence electron
Explanation:
Each column of the periodic table represents elements with a specific number of valence electrons. Columns 1 and 2 have one and two valence electrons respectively, and are known for their reactivity. Transition metals typically have one or two, Columns 3-7 have 3 to 7, and Noble Gases in Column 8 have a full shell of eight, making them unreactive.
Explanation:We can categorize columns, or groups, of the periodic table by the number of valence electrons, which are the outermost electrons in an atom that participate in chemical bonding.
Column 1: These elements, also known as alkali metals, have a single valence electron in their outermost shell. These elements are highly reactive due to their tendency to lose this electron and achieve a stable configuration.Column 2: These are the alkaline earth metals, which have two valence electrons. They are less reactive than alkali metals but will still readily lose their valence electrons to achieve stability. Transition Metal Columns: These contain transition metals which typically have one or two valence electrons, although this can be more complex due to the filling of inner d orbitals.Columns 3–7: Elements in these groups have 3 to 7 valence electrons respectively. Many form covalent bonds by sharing their valence electrons with other atoms.Column 8: Known as the Noble Gases, these elements possess a stable full set of 8 valence electrons (except for Helium which has 2). They are very unreactive due to their stable electronic configuration.Learn more about Valence Electrons here:
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What is the percent error if the density of alcohol is found to be 0.8023 g/mL (true value = 0.7980 g/mL)
Answer:
I am so sorry I wish I could help
Explanation:
maybe use a calculator
The percent error in the measured density of alcohol, with a measured value of 0.8023 g/mL and a true value of 0.7980 g/mL, is approximately 0.539%.
To calculate the percent error for the measured density of alcohol compared to the true value, you can use the following formula:
Percent Error = ( |Measured Value - True Value| / True Value ) 100%
Applying this formula to the given values:
Measured Value = 0.8023 g/mLTrue Value = 0.7980 g/mLWe calculate the absolute difference and then divide by the True Value:
0.8023 g/mL - 0.7980 g/mL| = 0.0043 g/mL
Now divide by the True Value of 0.7980 g/mL and multiply by 100:
(0.0043 g/mL / 0.7980 g/mL) 100%
approximately 0.539%
Therefore, the percent error in the measurement of the density of alcohol is approximately 0.539%.
In a particular case of alpha decay, and isotope of uranium, U with a mass number of 238 and an atomic number of 92 emits and alpha particle and transforms into thorium, which has an atomic number of 90. Write the equation for this decay process
Answer:
₉₂U²³⁸ → ₉₀Th²³⁴ + ₂He⁴
Explanation:
Alpha beta and gamma radiations are the examples of ionizing radiations. When an atom is an excited state and having high energy, the atom is in unstable state. The excess of energy is released by the atom to get the stability. The released energy is in the form of radiations which may include alpha, beta, gamma, X-ray etc.
Alpha decay:
Alpha radiations are emitted as a result of radioactive decay. The atom emit the alpha particles consist of two proton and two neutrons. Which is also called helium nuclei. When atom undergoes the alpha emission the original atom convert into the atom having mass number less than 4 and atomic number less than 2 as compared to parent atom the starting atom.
Properties of alpha radiation:
Alpha radiations can travel in a short distance.
These radiations can not penetrate into the skin or clothes.
These radiations can be harmful for the human if these are inhaled.
These radiations can be stopped by a piece of paper.
₉₂U²³⁸ → ₉₀Th²³⁴ + ₂He⁴
Which of the following environmental
concerns does not support the main idea
of this cartoon that people are observing
unusual weather patterns?
Answer:
4 overharvesting of seafood. All of the other options directly cause global warming/ climate change.
Explanation:
The cartoon suggests that people are observing unusual weather patterns, and among the environmental concerns listed, deforestation is the one that does not support the main idea.
The cartoon suggests that people are observing unusual weather patterns. To identify the environmental concern that does not support the main idea of the cartoon, we need to examine the choices provided.
However, based on the information given, we can make an educated guess.
1. Deforestation: Deforestation refers to the clearing or removal of trees from a forested area. While deforestation can have various environmental impacts, such as habitat destruction and soil erosion, it is not directly related to observing unusual weather patterns. Therefore, deforestation could be the environmental concern that does not support the main idea of the cartoon.
2. Air pollution: Air pollution refers to the presence of harmful substances in the air, such as gases and particles. While air pollution can affect weather patterns to some extent, it is not necessarily an unusual weather pattern itself. Therefore, air pollution may not be the environmental concern that does not support the main idea of the cartoon.
3. Global warming: Global warming refers to the long-term increase in Earth's average temperature due to human activities, primarily the emission of greenhouse gases. Global warming can lead to various changes in weather patterns, including more frequent and intense extreme weather events. Therefore, global warming is likely to support the main idea of the cartoon.
4. Water scarcity: Water scarcity refers to the lack of sufficient water resources to meet the demands of a particular region or population. While water scarcity can be influenced by changes in weather patterns, it is not necessarily an unusual weather pattern itself. Therefore, water scarcity may not be the environmental concern that does not support the main idea of the cartoon.
Based on the analysis above, deforestation is the environmental concern that does not support the main idea of the cartoon, which is about people observing unusual weather patterns.
How many silicon atoms are in a 50.0 gram sample of silicon?
Answer:
7.505
×
10
22
atoms. (rounded to third place of decimal)
Explanation:
describe the nature and structure of an atom
Answer:
Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).
Explanation:
determine the empirical formula for a compound that has the following analysis: a 13.07 g sample of an unknown substance is composed of 9.48 g of barium, 1.66 g of carbon, and 1.93 g of nitrogen
Answer: BaC2N2
Explanation: You start with your grams and divide them by their mass to get moles.
9.48g/137.33=.0690
1.66/12.01=.1382
1.93/14.007=.1379
You then take your moles and divide them by the smallest mole.
.0690/.0690=1
.1382/.0690=2.002
.1379/.0690=1.999
You then multiply them by a whole number to get them to be whole numbers, in this case you can use one.
1*1=1
2.002*1=2.002- round down to 2
1.999*1=1.999- round up to 2.
Final answer:
The empirical formula for the compound composed of barium, carbon, and nitrogen is found by converting the given masses to moles, determining the simplest whole number ratio of these moles, and combining them to form BaC2N2.
Explanation:
To determine the empirical formula for a compound with a given mass analysis, we first need to convert the mass of each element to moles by dividing by their respective atomic masses. The elemental masses given for the substance are 9.48 g of barium (Ba), 1.66 g of carbon (C), and 1.93 g of nitrogen (N).
We calculate the moles of each element as follows:
Moles of Ba = 9.48 g ÷ 137.33 g/mol (atomic mass of Ba) = 0.069 moles of Ba
Moles of C = 1.66 g ÷ 12.01 g/mol (atomic mass of C) = 0.138 moles of C
Moles of N = 1.93 g ÷ 14.01 g/mol (atomic mass of N) = 0.138 moles of N
Next, we determine the simplest whole number ratio of moles of each element:
The ratio for Ba is 0.069 ÷ 0.069 = 1
The ratio for C is 0.138 ÷ 0.069 = 2
The ratio for N is 0.138 ÷ 0.069 = 2
From these ratios, we find the empirical formula of the compound to be BaC2N2. This formula represents the simplest whole number ratio of elements within the compound.
Temperature and Energy do not have any affect on the changes of states of matter.
Answer:
False
Explanation: