Given the balanced equation representing a reaction:H+(aq) + OH-(aq) ==> H2O(l) + energy
In this reaction there is conservation of
(1) mass, only
(2) mass and charge, only
(3) charge and energy, only
(4) charge, energy, and mass

Answers

Answer 1

Answer:

Answer: option (4) charge, energy, and mass.

Justification:

1) Charge, energy, and mass are always conserved in every chemical reaction.

Charge, energy and mass are not created nor destroyed, but can be transferred.

2) The charge can only be transferred by the motion of electrons, so the charge can move and end up on a different atom, but when you add up all the charge is conserved.

The charge balance is verified in the given equation since:

left side right side

(1+) + (1-) = 1 - 1 = 0 0

∴ The total charge of the reactants equals the total charge of the products.

3) As for energy, the right side shows the "apparition" of some energy. That means that the reaction is exothermic, i.e. it releases energy.

The energy released is the net result of the difference in the potencial chemical energy of the bonds of the products and the reactants.

The reactants have more chemical energy stored than the reactants, so potential energy was transformed into heat energy.

4) As for the mass, its conservation is verified when you check that there are the same number of particles of each spieces: two particles of hydrogen in the reactand side, such as in the products; and the particles of oxygen are one in the reactants and one in the products.

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One way to limit deforestation is bya. practicing crop rotation.
b. increased soil fertilization.
c. increased use of wood products.
d. using wood from trees grown on tree farms.

Answers

One way to limit deforestation by practicing crop rotation. The correct option among all the options given in the question is option "a". Crop rotation will keep the farmers from further cutting of forests to gain fresh lands. This will also decrease the use of wood products. The soil will also gain strength due to rotation of crop.

Answer:

d. using wood from trees grown on tree farms.

Explanation:

What is visible light?

Answers

It’s the portion of the electromagnetic spectrum that is viable to the human eye.

Hope this helps! :)

If you are performing a stoichiometry problem and the only information you have to start is the molarity and volume of a solution used, what would you do?

Answers

Answer:

If you are performing a stoichiometry problem and the only information you have to start is the molarity and volume of a solution used, then one would multiply the molarity and volume to find moles.

Explanation:

In a stoichiometry problem, we multiply the molarity and volume to find moles, balance the chemical equation, find the mole ratio, calculate the moles of either the product formed or the reactant consumed in the reaction, and if required convert moles to grams.

It might be the best answer: multiply the molarity by the volume (in liters) to find moles

1. In general, the nucleus of a small atom is stable. Therefore, over very short distances, such as those in a small nucleus, a. the strong nuclear force is much greater than the electric force.
b. the electric force is much greater than the strong nuclear force.
c. the strong nuclear force equals the electric force.
d. the strong nuclear force and the electric force are both attractive.
9. Uranium-238 undergoes alpha decay. Therefore, uranium-238 will
a. remain stable.
b. change into a different element altogether.
c. emit neutral particles and no energy.
d. none of the above

Answers

1. Answer;

a. the strong nuclear force is much greater than the electric force.

Explanation;

For an atom to be stable it means it has enough amount of binding energy to hold its nucleus together permanently.
Therefore, an unstable atom lacks enough amount of binding energy to hold its nucleus permanently and thus undergoes decay to achieve stability. Unstable atoms are therefore referred to being radioactive.
Small atoms are stable; this is because they have equal number of protons and neutrons and thus the protons and neutrons fill up energy levels while maximizing the strong force binding the nucleus together.

9. Answer;

b. change into a different element altogether.

Uranium-238 undergoes alpha decay. Therefore, uranium-238 will change into a different element altogether.

Explanation;

Unstable atoms undergo radioactive decay in order to achieve stability of their nucleus.
Uranium-238 is an example of such atom, which may undergo decay to achieve stability.
Alpha decay is one of the types of decays, others being beta decay and gamma decay. In alpha decay the radioactive isotope undergoes decay such that its mass number is decreased by four and its atomic number is decreased by two.
Therefore, Uranium-238 undergoes alpha decay to form a different element whose mass number is 234 and atomic number is 90, known as thorium-234.

1. In general, the nucleus of a small atom is stable. Therefore, over very short distances, such as those in a small nucleus,

a. the strong nuclear force is much greater than the electric force.

9. Uranium-238 undergoes alpha decay. Therefore, uranium-238 will

b. change into a different element altogether.

Hope these answer the questions. Have a nice day.

Which of the following would not necessarily indicate a chemical reaction?change in temperature
chemical precipitation of a solid
production of a gas
change in volume

Answers

Answer: Option (d) is the correct answer.

Explanation:

A change that does not cause any difference in chemical composition of a substance are known as physical change.

For example, shape, size, mass, volume, density, etc of a substance are all physical changes.

And, a change that causes changes in chemical composition of a substance is known as chemical change.

For example, precipitation, reactivity, toxicity etc are chemical change.

Therefore, change in temperature, chemical precipitation of a solid, production of a gas are all indications of a chemical change.

Thus, we can conclude that change in volume would not necessarily indicate a chemical reaction.

Final answer:

Of the options provided, a change in volume would not necessarily indicate a chemical reaction. It could also be a sign of a physical change, such as a change in state.

Explanation:

The question is asking which of the listed factors would not necessarily indicate that a chemical reaction has taken place. From the options provided, a change in volume is not necessarily indicative of a chemical reaction. Other signs (like change in temperature, chemical precipitation of a solid, or production of a gas) are often valid signs of a chemical reaction, however, just a volume change could also be a sign of a physical change, such as a change in state from solid to liquid, or liquid to gas.

For example, when ice melts to water, or water evaporates to steam, it experiences a change in volume. This does not involve the forming or breaking of chemical bonds, thus it's not a chemical reaction, but a physical change.