Use the equation of motion to answer the question.

Question

x=x0+v0t+12at2
An object has a starting position of x = 2 m, a starting velocity of 4.5 m/s, and no acceleration. Which option shows the final position of the object after 2 s?
9 m
5.5 m
18 m
11 m

Calcium oxide and carbon dioxide combine to form calcium carbonate in the reversible reaction:

CaO + CO2 ⇌ CaCO3

When the reaction is at dynamic equilibrium, which statement must be true?
Calcium carbonate and calcium oxide are formed at the same rate.
The forward and reverse reactions have stopped.
The concentration of calcium carbonate is increasing.
The reaction has run out of carbon dioxide or calcium oxide.
Newton’s cradle is a contraption where metal balls hang from a frame. When one ball is pulled and released, the collision causes one ball on the opposite end to be released.

Which type of force can decrease the total momentum of this system?

strong nuclear force
magnetic force
gravitational force
electrostatic force
Which statement about the number of protons and neutrons in a nuclear change is correct?

The total charge before and after the change remains the same, but the total atomic mass is different.

The total atomic mass before and after the change remains the same, but the total charge is different.

The total number of neutrons and the total number of protons are the same before and after the change.

The number of protons and the number of neutrons can differ before and after the change, but the total number of those particles remains the same.
Hydrochloric acid and sodium hydroxide react to produce water and sodium chloride in an endothermic reaction. Which statement must be true of the reaction?

The total bond energy of water and sodium chloride is greater than the total bond energy of hydrochloric acid and sodium hydroxide.

The bond energy used to break the bonds in hydrochloric acid and sodium hydroxide is less than the energy released to form the bonds in water and sodium chloride.

More bond energy is absorbed on the reactants side than is released on the products side.

The energy of each bond in water and sodium chloride is greater than the energy of each bond in hydrochloric acid and sodium hydroxide.