Charlie is balancing an equation. She has identified the atoms and counted the number of each in the reactants and products. What would Charlie adjust to make the number of atoms in the reactants the same as the number of atoms in the products?

Answers

Answer 1

Answer:

Answer: Stochiometric coefficients

Explanation: The chemical equations must be balanced to follow the law of conservation of mass which says that the mass of products must be same as the mass of reactants.

$CH_4+O_2\rightarrow CO_2+H_2O$

This is a skeletal equation and needs to be balanced by adjusting the stochiometric coefficients. In order to keep the mass same, the number of atoms must be same on both sides.

$CH_4+2O_2\rightarrow CO_2+2H_2O$

Answer 2

Answer:

Answer:

The stoichiometric coefficients.

Explanation:

Hello,

Chemical reactions are widely generalized by the following chemical equation:

$aA+bB-->cC+dD$

Capitalized letters are referred to both the reacting and produced species during the chemical reaction meanwhile the lowered case letters are referred to the stoichiometric coefficients which balance the chemical reaction. Balancing means that the number of atoms in the reagents must be equal to the number of atoms in the products, this is exemplified via the following balanced chemical reaction:

$2HCl+Ca(OH)_2-->CaCl_2+2H_2O$

The coefficient 2 in the hydrochloric acid is set due to the produced calcium chloride which has two chlorine atoms in order to equal them.

Best regards.

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A student tested a sample of carbon (C) by combining it with water. There was no reaction between the carbon and water. The student concluded that carbon must be a group 18 element, since it was unreactive. State whether you agree with the student's reasoning, and explain why or why not?
Of these nonmetals, which one is likely to be the least reactive?A. nitrogen (N) B. phosphorous (P) C. sulfur (S) D. oxygen (O)
What is the name for the following compound
What is the electron configuration of an element with atomic number 20?

How do electrons populate atoms?

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Electrons fill the electron orbitals (s, p, d, or f) starting from the lowest energy level going to the highest energy level. I hope this helps. let me know if you need more information such as what the

What kind of energy transformation occurs in a gasoline-powered car? A.
Chemical energy is converted into mechanical energy.

B.
Mechanical energy is converted into light energy.

C.
Light energy is converted into sound energy.

D.
Sound energy is converted into chemical energy.

Answers

The energy transformation occurs in a gasoline-powered car is chemical energy is converted into mechanical energy. The answer is letter A. The rest of the choices do not answer the question above.

The answer is A. Chemical edgy is converted into mechanical energy. This is done buy the combustion engine of the car. The gasoline (chemical) is ignited by the spark plug moves the pistons in the engine (mechanical).

An important application of exponential functions is working with half-life of radioactive isotopes in chemistry. These isotopes emit particles and decay into stable forms, in doing so they lose mass over time. Half-life of an isotope is the time it takes for the amount to decay by half. For example, the half life of Bromine-85 is 3 minutes. This means if you start with 60g of Br-85, 3 minutes later 30g will remain. How much Br-85 will remain after 20 minutes?

Answers

Answer : The amount left after 20 minutes is, 0.592 grams.

Explanation :

Half-life of Bromine-85 = 3 min

First we have to calculate the rate constant, we use the formula :

$k=\frac{0.693}{3\text{ min}}$

$k=0.231\text{ min}^(-1)$

Now we have to calculate the amount left after decay.

Expression for rate law for first order kinetics is given by:

$t=(2.303)/(k)\log(a)/(a-x)$

where,

k = rate constant

t = time taken by sample = 20 min

a = initial amount of the reactant = 60 g

a - x = amount left after decay process = ?

Now put all the given values in above equation, we get

$20=(2.303)/(0.231)\log(60)/(a-x)$

$a-x=0.592g$

Therefore, the amount left after 20 minutes is, 0.592 grams.

The process of a material going through a change of state from a gas to a liquid is called _____. melting freezing condensation vaporization

Answers

Condensation is the change in state of matter from gas to liquid.

The process of a material going through a change of state from a gas to a liquid is called _____.

condensation

How much energy is needed to heat enough water to make a cup of tea (250 ml), if the water is initially at 20.0°C and you want to increase the temperature to 85.0°C? (1.00 mL of water has a mass of 1.00 g.)As the tea in the previous question steeps, it cools from 85.0°C to 75.0°C. How much energy is lost by the tea as it steeps?

Answers

Answer:

Heat Energy needed (Q) = 68250 J

Energy lost (Q') = 10500 J

Explanation:

Applying,

Q = cm(t₂-t₁)............. Equation 1

Where Q = heat energy needed, c = specific heat capacity of water, m = mass of water, t₁ = initial temperature, t₂ = final temperature.

From the question,

Given: m = 250 g = 0.25 kg, t₁ = 20.0°C, t₂ = 85.0°C

Constant: c = 4200 J/kg°C

Substitute these values into equation 1

Q = 0.25(4200)(85-20)

Q = 68250 J.

Similarly, heat lost

Q' = cm(t₁-t₂)................. Equation 2

Where Q = heat lost

Given: t₁ = 85°C, t₂ = 75°C

Substitute into equation 2

Q' = 4200(0.25)(85-75)

Q' = 10500 J

Write a balanced nuclear reaction for the following:234/91 Pa → 4/2 He+

When balancing the nuclear reaction, explain the following:
How does the Law of Conservation of Matter dictate what the daughter nuclide is?
How do we calculate the atomic mass and atomic number for the daughter nuclide?
Where do we look up what the new daughter nuclide element is?

Answers

Balanced nuclear reaction: 234/91 Pa → 4/2 He + 230/89 Ac.
1) number of protons and neutrons on both side of nuclear reaction must be the same. There are 91 protons (atomic number) and 143 neutrons (mass number - atomic number, 234 - 91 = 143 or (4-2) + (230 - 89) = 143)) on both side of reaction.
2) alphadecay is radioactive decay in whichan atomic nucleus emitsan alpha particle (heliumnucleus) and transforms into an atom with an atomicnumber that is reduced by two and mass number that is reduced by four, so atomic mass of new element is 89 (91 - 2) and mass number is 230 (234 - 4 = 230).
3) look at atomic number, element with atomic number 89 is actinium.

Final answer:

The balanced nuclear reaction is 234/91 Pa -> 4/2 He + 230/89 Ac. You calculate the atomic mass and atomic number of the daughter nuclide by subtracting the atomic mass and atomic number of the alpha particle from the parent nuclide. Then, refer to the periodic table to identify the element with the corresponding atomic number.

Explanation:

The process described in the question is a typical alpha decay nuclear process. In this reaction, a Protactinium-234 nuclide emits an alpha particle (which is a Helium nucleus) to produce a new nuclide, the daughter nuclide.

According to the Law of Conservation of Matter, the sum of the mass and atomic numbers (protons + neutrons) of the reactants must equal the sum of the mass and atomic numbers of the products. This means we can calculate the atomic number and atomic mass of the daughter nuclide. The atomic mass would be the difference: 234 - 4 = 230. The atomic number would be the difference: 91 - 2 = 89.

After that, you can identify the new element by its atomic number, 89, from a periodic table, which shows it to be Actinium (89/230 Ac).

So, the balanced nuclear reaction is: 234/91 Pa -> 4/2 He + 230/89 Ac

Learn more about Balancing Nuclear Reactions here:

brainly.com/question/32083783

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