Galaxy Formation. One says that galaxies were born when vast clouds of gas and dust collapsed under their own gravitational pull, allowing stars to form. The other, which has gained strength in recent years, says the young universe contained many small "lumps" of matter, which clumped together to form galaxies.
What does a wave do?
O
A. It repels charges that are alike.
O
B. It converts matter into energy.
C. It attracts particles over a distance.
O
D. It moves energy through space.
SUBMIT
Answer:
D. It moves energy through space
Explanation:
i searched it
At equilibrium the partial pressures of N2O4 and NO2 are 0.35 atm and 4.3 atm. What is the Kp
The equilibrium constant, Kp, can be calculated using the formula Kp = (PNO2)^2 / PN2O4, where PNO2 and PN2O4 are the partial pressures of NO2 and N2O4 at equilibrium. In this case, the given partial pressures are 0.35 atm and 4.3 atm, respectively. By substituting these values into the formula, we find that Kp is approximately 52.37.
Explanation:The equilibrium constant, Kp, is a measure of the ratio of the product pressures to the reactant pressures at equilibrium. In this case, we are given the partial pressures of N2O4 (0.35 atm) and NO2 (4.3 atm) at equilibrium. Since Kp is defined as the ratio of product pressures to reactant pressures, we can calculate Kp using the formula Kp = (PNO2)2 / PN2O4.
Substituting the given values into the formula gives Kp = (4.3)2 / 0.35 = 52.37. Therefore, the equilibrium constant Kp is approximately 52.37.
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The equilibrium constant (Kp) for the equilibrium between [tex]NO_2[/tex] and [tex]N_2O_4[/tex] with given partial pressures is 0.0189.
The degree of thermodynamic activity of a gas corresponds to its partial pressure.
To calculate the equilibrium constant (Kp) for the reaction 2 [tex]NO_2[/tex](g) = [tex]N_2O_4[/tex] (g), we use the following equilibrium expression:
[tex]Kp = (PN_2O_4) / (PNO_2)2[/tex]
Given the partial pressures at equilibrium, [tex]PN_2O_4 = 0.35[/tex] atm and [tex]PNO_2 = 4.3[/tex] atm, we can substitute these values into the equation to find the Kp:
Kp = (0.35) / (4.3)2
After squaring the partial pressure of [tex]NO_2[/tex] and dividing by the partial pressure of [tex]N_2O_4[/tex], we get:
Kp = 0.35 / 18.49
Kp = 0.0189 (to four significant figures)
Name another career that combines science with another interest .
Answer Archeology
Explanation:
You like to dig holes? ARCHEOLOGY
3. Use your knowledge of collision theory to explain the results of your experiments in this laboratory. PLEASE HELP ME.
Answer: I don’t have much of a clue as to what you did; I wasn’t there . In gas theories however, the heated gas into a balloon will expand, and gases when under pressure can liquify. It is easy to see which molecules were popped around the most! Read that chapter and work all of the problems.
Explanation:
A solution contains an unknown mass of dissolved barium ions. When sodium sulfate is added to the solution, a white precipitate is filtered and dried and found to have a mass of 258 mg. What mass of barium was in the original solution assume that all of the barium was precipitated out of the solution you the reaction.
Answer:
The mass of barium in the original solution was 152mg.Explanation:
The white precipiate that is formed when sodium sulfate, Na₂SO₄, reacts with barium ions in solution, Ba²⁺, is barium sulfate, BaSO₄.
The molar mass of BaSO₄ is 233.38 g/mol. Thus, the number of moles of BaSO₄ is:
#moles = mass in grams / molar mass#moles = 258mg × (1g/1,000mg) × (1mol/233.38g) = 0.00110549molSince 1 mole of BaSO₄ contains 1 mole of Ba, there are 0.00110549 mol of Ba²⁺ ions.
Use the atomic mass of Ba to calculate the mass in grams in the original solution:
mass = number of moles × atomic massmass = 0.00110549mol × 137.327g/mol = 0.1518g.mass = 151.8mg = 152mgThen, with 3 significant figures, there were 152mg of barium in the original solution.
4.00 g of sodium and 2.00 g of oxygen react according to the following balanced equation 4 Na + O2 → 2 Na2O Calculate the mass of Na2O that can be produced by this reaction
The mass of Na₂O produced from the reaction of 4.00 g of sodium with 2.00 g of oxygen is 5.39 g, using stoichiometry and molar mass conversions.
Reaction Stoichiometry and Mass Calculations
To calculate the mass of Na₂O produced from 4.00 g of sodium (Na) and 2.00 g of oxygen (O₂), first, we need to convert the mass of the reactants to moles using their molar masses. The molar mass of sodium is approximately 23 g/mol, and for oxygen (O₂), it is about 32 g/mol. As a result, we have:
4.00 g Na times (1 mol Na / 23 g Na) = 0.174 mol Na
2.00 g O₂ times (1 mol O₂ / 32 g O₂) = 0.0625 mol O₂
From the balanced equation, 4 moles of Na react with 1 mole of O₂ to produce 2 moles of Na₂O. This indicates that sodium is the limiting reagent since fewer moles of it are available relative to the stoichiometric requirements. Thus, we can calculate the amount of Na2O produced:
0.174 mol Na times (1 mol Na₂O / 2 mol Na) = 0.087 mol Na₂O
The last step is to convert moles of Na2O to grams using its molar mass (Na₂O has a molar mass of approximately 62 g/mol):
0.087 mol Na₂O times (62 g Na₂O / 1 mol Na₂O) = 5.39 g Na₂O
Therefore, 5.39 g of Na₂O can be produced by the reaction of 4.00 g of sodium with 2.00 g of oxygen.
how can you tell if your friends are fake or not
Answer:
you ask them a couple of questions like what would u do in this problem and see their answer
Explanation:
Honestly I'm going through a lot of fake friends right now and I don't have the guts to tell them off cause I feel bad. But a way to see if there fake is if they usually don't want to hang out with you or always change the plans, or just act like your friends when they want something such as buying them stuff, giving them money, or just wanting something. Another way to test is if they do everything they can to give you as little as possible. If they do stuff like this just stop talking to them or try to get away from what they want or ditch them and tell them their fake.
If 1.13 x 104 J of heat is added to a water sample and the temperature rises from 88.0 ºC to its boiling point, what mass of water is in the sample?
A. 225 g
B. .255 g
C. 2.55 g
D. 25 g
Answer:
c
Explanation:
heatmass*density*temp. difference=
In the sample, the mass of water is "225 g".
Given:
Heat energy,
[tex]Q = 1.13\times 10^4 \ J[/tex]Specific heat,
[tex]c = 4.186 \ J/g.^{\circ} C[/tex]The change in temperature,
[tex]\Delta T =boiling \ point - 88.0^{\circ} C[/tex][tex]= 100-88[/tex]
[tex]= 12 ^{\circ} C[/tex]
As we know,
→ [tex]Q = mc \Delta T[/tex]
→ [tex]1.13\times 10^4=m\times 4.186\times 12[/tex]
→ [tex]m = \frac{1.13\times 10^4}{4.186\times 12}[/tex]
→ [tex]= 224.956 \ g[/tex]
or,
→ [tex]= 225 \ g[/tex]
Thus the answer above is appropriate.
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Select one metal which will displace Sn from
a compound and form metallic tin (Sn).
Cu, Cr, Hg, Ag
Answer:
Cr
Explanation:
Cr will displace Sn from compound because Cr is higher than Sn in the electrochemical series of metals
Answer:
Cr
Explanation:
PLS HELP!!! ASAP
The table below shows the depths at which an index fossil and three other fossils were found.
Fossil Data
Fossil Depth (meters)
A 294
B 365
C 375
Index fossil 460
Which statement is correct?
Fossil B is older than the index fossil.
The index fossil is younger than Fossil C.
Fossil A is younger than the index fossil.
The index fossil is the same age as Fossil C.
Answer:
The Correct Answer is C
Fossil A is younger than the index fossil.
Explanation:
Fossil A is younger than the index fossil is correct statement. Hence option 3 is correct.
What are fossils?Fossils are defined as an animal or plant relic, impression, or trace that has survived in the Earth's crust over time. A living object, such an animal or plant, dies and is quickly buried by debris, like mud, sand, or volcanic ash, which results in the creation of fossils. Important evidence for evolution and the environmental adaptation of plants and animals can be found in fossils.
Index fossils are fossils that are common yet were only present for a brief time. By comparing a rock layer to other rock layers, index fossils enable scientists to determine the relative age of a rock layer. Organisms that are still alive today yet have undergone little alteration over millions of years are known as living fossils.
Thus, fossil A is younger than the index fossil is correct statement. Hence option 3 is correct.
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What volume of 0.05 mol/L HCl is required to react with 5.00g of manganese dioxide according to this equation?
4HCl(aq) + MnO2(s) → 2H2O(l) + MnCl2(aq) + Cl2(g)
217 ml of 0.05 M HCl will be required to react with 5 gm of MnO2 according to the equation given.
Explanation:
The balanced chemical equation is given as:
4HCl(aq) + MnO2(s) → 2H2O(l) + MnCl2(aq) + Cl2(g)
This shows that 4 moles of HCl reacts with 1 mole of MnO2
the mass of Manganese oxide is given as 5 grams
molar mass of MnO2 = 86.93 grams/mole
number of moles of MnO2 is given by
number of moles = [tex]\frac{mass}{atomic mass of one mole}[/tex]
number of moles= [tex]\frac{5}{86.93}[/tex]
= 0.0575 moles of MnO2
From the equation:
4 moles of HCl reacts with 1 mole of MnO2
x moles of HCl reacts with [tex]\frac{0.0575}{x}[/tex] moles of MnO2
[tex]\frac{1}{4}[/tex] = [tex]\frac{0.0575}{x}[/tex]
= 0.23 moles of HCl will react
atomic mass of HCl = 36.46 Grams/mole
mass = 0.23 x 36.46
= 8.3858 grams.of HCl
molarity of HCl = [tex]\frac{number of moles}{volume in liters}[/tex]
volume is 1 litre
so molarity is 0.23 M
Using the formula
M1V1 = M2V2
0.05 x 1 = 0.23 X x
x = 0.217 litre
so 217 ml of 0.05 M HCl will be required to react with 5 gm of MnO2.
What is the relationship between molecules and atoms?
Molecules are combinations of two or more atoms.
Molecules are the parts that make up atoms.
Molecules are the gaseous form of atoms.
Molecules are atoms that have a positive charge.
Molecules are combinations of two or more atoms.
The relationship between molecules and atoms is molecules are combination of two or more atoms (1st option)
How to determine the relation between atoms and molecules?
To obtain the relationship between atoms and molecules, we must know the definition of atom and molecule. This is given below:
Atoms are smallest particles of an element that can partake in a chemical reaction.
Molecules are combination of two or more atoms that can exist free in natural state
From the above definition, we can see that molecules contains atoms.
Thus, we can conclude that from the above definition that the correct answer to the question is molecules contains two or more atoms (1st option)
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Item 4
How do conditions change as the depth of the ocean water increases?
Temperature increases and pressure decreases.
Temperature increases and pressure increases.
Temperature decreases and pressure increases.
Temperature decreases and pressure decreases.
Answer:
c
Explanation:
Answer:
option 2
Explanation:
temperature decreases as you are further away from the sun and less thermak energy is reaching you. the pressure increases as more water is above you.
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Sugar water is a:
O Homogeneous mixture
Heterogeneous mixture
Answer:
It is a homogeneous mixture
How much heat must your body transfer to 500.0g of water to heat it from 25.0°C to body temperature, 37.0°C?
Answer : The heat your body transfer must be, 25.1 kJ
Explanation :
Formula used :
[tex]Q=m\times c\times \Delta T[/tex]
or,
[tex]Q=m\times c\times (T_2-T_1)[/tex]
where,
Q = heat = ?
m = mass of water = 500.0 g
c = specific heat of water = [tex]4.18J/g^oC[/tex]
[tex]T_1[/tex] = initial temperature = [tex]25.0^oC[/tex]
[tex]T_2[/tex] = final temperature = [tex]37.0^oC[/tex]
Now put all the given value in the above formula, we get:
[tex]Q=500.0g\times 4.18J/g^oC\times (37.0-25.0)K[/tex]
[tex]Q=25080J=25.1kJ[/tex]
Therefore, the heat your body transfer must be, 25.1 kJ
5. How many grams of cobalt are in 1.52 x 1024 atoms of cobalt?
149 g of cobalt are present in 1.52 x [tex]10^{24}[/tex] atoms of cobalt.
Explanation:
One mole of an atom is equal to the Avagadro number of the atom.
[tex]1 \ mol \ of \ Co = 6.023\times10^{23} atoms\ of \ Co[/tex]
The number of atoms per mol is divided by the given atoms of Cobalt.
= [tex](1.52 \times 10^{24}) \times[/tex] [tex]\frac{1 \ mol\ Co}{6.023 \times10^{23}\ atoms\ Co}[/tex]
= 2.52 mol of Co
To covert, the moles into grams multiply the mole value by its molar mass
The Molar mass of Cobalt is 58.93
= 2.52 [tex]\times[/tex] 58.93
= 149 g.
Using Avogadro's number and the molar mass of cobalt, one can calculate that 1.52 x 10²24 atoms of cobalt equates to approximately 148.51 grams of cobalt.
Explanation:To determine how many grams of cobalt are in 1.52 x 1024 atoms of cobalt, we need to use Avogadro's number and the molar mass of cobalt. Avogadro's number tells us that there are 6.022 x 1023 atoms in one mole of any substance. The molar mass of cobalt (Co) can be found on the periodic table, and it is about 58.93 grams per mole.
The calculation, similar to conversions seen in examples given, would be as follows:
Determine how many moles of cobalt the given number of atoms represents: (1.52 x 1024 atoms Co) / (6.022 x 1023 atoms/mole) = 2.52 moles CoConvert moles of cobalt to grams using the molar mass of cobalt: 2.52 moles Co x 58.93 g/mole = 148.51 grams CoTherefore, there are 148.51 grams of cobalt in 1.52 x 1024 atoms of cobalt.
What purpose do cooling towers serve in a nuclear power plant?
A. to retain the nuclear gases emitted from the nuclear reactions
B. to provide a location for the heated water to cool and condense
C. to maintain the high temperatures required for the nuclear reactions
D. to act as a barrier to contain radiation in case of a possible meltdown
Answer:
B
Explanation:
Cooling towers provide an energy efficient and environmentally friendly way of removing heat from this circulating water before it is returned to its source.
If different atoms can come together to form all living and nonliving things, why is there a limit to different combinations we encounter around the universe?
Answer: gas dissolved in liquid
Explanation:
The different atoms lead to the formation of living and nonliving things then
Such as a brick is used to create a house that is nonliving but the formation of the brick needs many raw materials. The gas dissolved in liquids is one of the combinations that we have hence various atoms can come into the same universe.Learn more about why is there a limit to different combinations.
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explain why alchemy is not as reliable as modern day science
Answer:
Explanation:
Alchemy is the forerunner of modern chemistry practiced during the medieval times. Chemists of those times were known and called alchemists.
These chemists had a very shallow knowledge of chemistry but were able to produce a wide range of chemicals.
Alchemy predates the scientific method. Modern science is investigative and relies on the precepts of detailed and methodical process. Modern day chemistry is a vertiginous study with more depth. It seeks to provide details into reasons why certain chemical matter exists as they are. Or how combinations in reactions takes place. Alchemy does not follow the scientific method in its investigationPLEASE ANSWERRRRRR
Travels faster through air than metal.
electromagnetic wave, mechanical wave, or both.
Electromagnetic wave travels faster through air than metal.
Option A
Explanation:
There are different kinds of wave energy. The most significant are electromagnetic and mechanical waves. The mechanical waves propagate through the medium by transfer of energy by vibrating of particles in medium.
So, the more number of particles present in the medium, the more fast the mechanical wave can propagate. So the mechanical waves travel faster in metals consisting of more number of free charge carriers. But electromagnetic waves does not need any of the medium to propagate. So it can travel faster in air than in metals.
Which of these changes most likely results in an increase in the volume of a gas?
ma
Answer:
ok so you take the volume then divide it by the pressure, and subtract the area to find the rough estimate. but your probably looking for an exact answer so you take that and then do that when you get that thatll be that.
Explanation:
Decreasing the pressure on the gas will most likely result in an increase in the volume of a gas.
What is pressure?Pressure is defined as the force applied on an object perpendicular to it's surface per unit area over which it is distributed.Gauge pressure is a pressure which is related with the ambient pressure.
There are various units by which pressure is expressed most of which are derived units which are obtained from unit of force divided by unit of area . The SI unit of pressure is pascal .
It is a scalar quantity which is related to the vector area element with a normal force acting on it.It is distributed over solid boundaries and across arbitary sections of fluid normal to the boundaries at every point.
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Determine the temperature (in K) of 1.5 moles of gas contained in a 5.5 L vessel at a pressure of 192.4 kPa.
Answer:
84.96K
Explanation:
The following were obtained from the question:
n = 1.5 mole
V = 5.5L
P = 192.4 kPa = 192400Pa
Recall
101325Pa = 1atm
192400Pa = 192400/101325 = 1.9atm
R = 0.082atm.L/K /mol
T=?
We can obtain the temperature by applying the following:
PV = nRT
T = PV / nR
T = (1.9 x 5.5)/(1.5 x 0.082)
T = 84.96K
How many grams of CO2 or an 800 mL at 94.5 K PA at -10°C?
Answer:
1.52g
Explanation:
First, let us calculate the number of mole of CO2 present. This is illustrated below:
V = 800mL
Recall: 1000mL = 1L
800mL = 800/1000 = 0.8L
P = 94.5 KPa = 94500Pa
Recall: 101325Pa = 1atm
94500Pa = 94500/101325 = 0.93atm
T = -10°C = -10 + 273 = 263K
R = 0.082atm.L/Kmol
n =?
PV = nRT
n = PV/RT
n = (0.8x0.93)/(0.082x263)
n = 0.0345mol
Now, we can obtain the mass of CO2 as follows:
Molar Mass of CO2 = 12 + (2x16) = 12 + 32 = 44g/mol
Number of mole of CO2 = 0.0345mol
Mass of CO2 = number of mole x molar Mass
Mass of CO2 = 0.0345 x 44 = 1.52g
Determine the molecular formula of decene, which has an empirical formula of CH2 and a molar mass of 140.27 g/mol.
Answer:
Molecular formula = C₁₀H₂₀
Explanation:
Given data:
Empirical formula = CH₂
Molar mass = 140.27 g/mol
Molecular formula = ?
Solution:
Molecular formula = n (empirical formula)
n = molar mass of compound / empirical formula mass
Now we will calculate the empirical formula mass.
CH₂ = 12 × 1 + 1× 2
CH₂ = 12 +2
CH₂ = 14
n = 140.27 / 14
n = 1 0
Molecular formula = n (empirical formula)
Molecular formula = 10 (CH₂)
Molecular formula = C₁₀H₂₀
A 475mL sample of gas was collected at a temperature of -21.5 and a pressure of 756mmHg. Calculate the volume of a gas(in liters) if the conditions were altered to STP
The volume of gas under STP is 0.512 liters.
Explanation:
At STP (Standaed Temperature and Pressure)
T = 0°C
P = 1 atm = 760 mmHg
Given
P1 = 756 mmHg
T1 = -21.5°C = -21.5 + 273 = 251.5 K
V1 = 475 mL = 0.475 L
P2 = 760 mmHg
T1 = 0°C = 0 + 273 = 273 K
We know that
[tex]\frac{P1 \times V1}{T1} = \frac{P2 \times V2 }{T2}\\\\\frac{756 \times 0.475}{251.5} = \frac{760 \times V2}{273}\\[/tex]
[tex]V2 = \frac{273 \times 756 \times 0.475}{251.5 \times 760} \\V2 = \frac{98034.3}{191140}[/tex]
V2 = 0.512 L
Question 17 of 25
4 Points
The law of conservation of mass states that in a chemical reaction, matter is
not created or destroyed.
O
A. True
O
B. False
Answer:
Why would it be false? That would be a great magic act.
Explanation:
I need some help please
look on google calculator
Nickel is extracted from nickel oxide by reduction with carbon.
Explain why carbon can be used to extract nickel from nickel oxide.
Answer:
Nickel is extracted from nickel oxide by reduction with carbon. Nickel is a metal which react with atmospheric oxygen which is very reactive in order to protect the inner surface of metal. Carbon extract oxygen which is attached to the nickel in the form of nickel oxide because carbon is more reactive so it made a chemical bonds with oxygen and nickel oxide is converted into a pure nickel.
Carbon is used to extract nickel from nickel oxide because carbon acts as a reducing agent. During the reduction reaction, carbon reacts with nickel oxide to form nickel and carbon dioxide. Carbon's greater affinity for oxygen allows it to remove oxygen from nickel oxide, leaving nickel.
Explanation:Carbon can be used to extract nickel from nickel oxide because of its ability to act as a reducing agent. In this context, a reducing agent is a substance that donates electrons to another substance, in this case, nickel oxide. This reduction reaction involves carbon reacting with nickel oxide to form nickel and carbon dioxide. Carbon, having a greater affinity for oxygen than nickel, binds with the oxygen in the nickel oxide forming carbon dioxide and leaving the nickel behind. This process is commonly used in metal extraction from their oxides, especially those of less reactive metals like nickel.
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Pure water can be consumed in a chemical reaction, resulting in the formation of a new
product. Refer to paragraph four. What type of change is this?
A. A physical change
B. A chemical change
C. A mixture change
D. A compound change
Answer: A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another.[1] Classically, chemical reactions encompass changes that only involve the positions of electrons in the forming and breaking of chemical bonds between atoms, with no change to the nuclei (no change to the elements present), and can often be described by a chemical equation. Nuclear chemistry is a sub-discipline of chemistry that involves the chemical reactions of unstable and radioactive elements where both electronic and nuclear changes can occur.
The substance (or substances) initially involved in a chemical reaction are called reactants or reagents. Chemical reactions are usually characterized by a chemical change, and they yield one or more products, which usually have properties different from the reactants. Reactions often consist of a sequence of individual sub-steps, the so-called elementary reactions, and the information on the precise course of action is part of the reaction mechanism. Chemical reactions are described with chemical equations, which symbolically present the starting materials, end products, and sometimes intermediate products and reaction conditions.
Chemical reactions happen at a characteristic reaction rate at a given temperature and chemical concentration. Typically, reaction rates increase with increasing temperature because there is more thermal energy available to reach the activation energy necessary for breaking bonds between atoms.
Reactions may proceed in the forward or reverse direction until they go to completion or reach equilibrium. Reactions that proceed in the forward direction to approach equilibrium are often described as spontaneous, requiring no input of free energy to go forward. Non-spontaneous reactions require input of free energy to go forward (examples include charging a battery by applying an external electrical power source, or photosynthesis driven by absorption of electromagnetic radiation in the form of sunlight).
Different chemical reactions are used in combinations during chemical synthesis in order to obtain a desired product. In biochemistry, a consecutive series of chemical reactions (where the product of one reaction is the reactant of the next reaction) form metabolic pathways. These reactions are often catalyzed by protein enzymes. Enzymes increase the rates of biochemical reactions, so that metabolic syntheses and decompositions impossible under ordinary conditions can occur at the temperatures and concentrations present within a cell.
The general concept of a chemical reaction has been extended to reactions between entities smaller than atoms, including nuclear reactions, radioactive decays, and reactions between elementary particles, as described by quantum field theory.
When pure water is consumed in a chemical reaction, it undergoes a chemical change and forms new substances.
Explanation:The type of change that occurs when pure water is consumed in a chemical reaction, resulting in the formation of a new product, is B. A chemical change.
In a chemical change, the substances involved undergo a chemical reaction and form new substances with different properties. In this case, when water is consumed, it is chemically broken down and transformed into other compounds and molecules that are used by our bodies.
An example of a chemical change involving water is the process of digestion. When we consume food, it goes through various chemical reactions in our body, breaking down into smaller molecules that our cells can utilize.
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(DUE 4:00 AM PLEASE HELP!)
Carbon has an atomic number of 6 and an atomic mass of 12.011.
Carbon-12, Carbon-13, and Carbon-14 are all isotopes of carbon.
What is the difference between those three isotopes?
Answer:
Explanation:
Isotopes, by definition, are a set of elements having the same Atomic No. (# protons) but different Atomic Masses due to variations in number of neutrons.
Isotope #p⁺ #n° #e⁻ (neutral element)
C-12 6 6 6
C-13 6 7 6
C-14 6 8 6