FREE NYSTCE Chemistry Questions and Answers

Question 1

In general, how do atomic masses vary across the periodic table of elements?

Accepted Answer

They increase from left to right and top to bottom.

Answer

They increase from right to left and top to bottom.

Answer

They increase from right to left and bottom to top.

Answer

They increase from left to right and bottom to top.

Question 2

How many moles of carbon-12 are there in 6 grams of carbon-12?

Accepted Answer

0.5 mole

Answer

3.01 ×1023 moles

Answer

2.0 moles

Answer

6.02 ×1023 moles

Question 3

Which of these atoms has the greatest atomic radius?

Accepted Answer

barium (Ba)

Answer

magnesium (Mg)

Answer

iodine (I)

Answer

chlorine (Cl)

Question 4

Why is cobalt (Co) listed before nickel (Ni) on the periodic table of elements, despite having a higher average atomic mass?

Accepted Answer

Nickel has one more proton.

Answer

Cobalt has a lower density.

Answer

Cobalt was discovered first.

Answer

Nickel has fewer electrons.

Question 5

In theory, as an ideal gas cools in a closed container, the pressure inside gradually decreases until it approaches that of a vacuum. What temperature should this happen at?

Accepted Answer

0 K

Answer

−273 K

Answer

0 °C

Answer

−460 °C

Question 6

Which of the following accurately describes the rate of this chemical reaction?

Accepted Answer

an increase in the concentration of HCl with time

Answer

a decrease in HCl and Cl2 with time

Answer

an increase in H2 and Cl2 with time

Answer

an increase in the concentration of HCl and H2 with time

Question 7

When a cold tire is inflated to a specific pressure and then heated by road friction, the pressure increases.
This occurs because of

Accepted Answer

air molecules speed up and collide with the tire walls more often.

Answer

rubber in the tire reacts with oxygen in the atmosphere.

Answer

air molecules hit the walls of the tire less frequently.

Answer

air molecules diffuse rapidly through the walls of the tire.

Question 8

Which substance is composed of numerous monomers joined in long chains?

Accepted Answer

protein

Answer

ethanol

Answer

propane

Answer

salt

Question 9

Which statement best describes the density of the nucleus of an atom?

Accepted Answer

The nucleus occupies very little of the atom’s volume but contains most of its mass.

Answer

The nucleus occupies most of the atom’s volume and contains most of its mass

Answer

The nucleus occupies most of the atom’s volume but contains little of its mass.

Answer

The nucleus occupies very little of the atom’s volume and contains little of its mass.

Question 10

Which action will cause the above response to shift to the right?

Accepted Answer

increasing the system’s pressure

Answer

heating the equilibrium mixture

Answer

adding water to the system

Answer

decreasing the oxygen concentration