UNIT 5 - TEST REVIEW

In a chemical equation, “dissolved in water” is represented by which of the following symbols?

• (s)

• (l)

• (g)

• (aq)

What evidence above supports a chemical change in the unknown metal?

• It conducts heat.

• It reacts with nitric acid to produce a gas.

• It has a density of 10.49 g/cm³.

• It is powdery white.

How many atoms of oxygen are represented in 2Pb(SO₄)₂?

• 2

• 4

• 8

• 16

Tags

NGSS.MS-PS1-1

Which of the following statements about the reaction below is not true? N₂(g) + 3H₂(g) ⇌ 2NH₃(g) + energy

• It is endothermic.

• Overall, it releases energy.

• It is in equilibrium.

• It is reversible.

Tags

NGSS.HS-PS1-4

Which of the following statements is true about chemical equilibrium?

• The reaction has reached its end.

• The forward and reverse reactions occur at the same rate.

• The concentration of reactants is higher than the concentration of products.

• The amount of reactants and products is the same.

Tags

NGSS.HS-PS1-6

According to Le Chatelier’s principle, if the temperature of an exothermic reaction at equilibrium is increased, what will happen?

• The forward reaction will be favored.

• The reaction rate will increase.

• The reverse reaction will be favored.

• No change will occur.

Tags

NGSS.HS-PS1-6

According to Le Chatelier’s principle, if more water was added to the following reaction at equilibrium, what will happen? 3Fe(s) + 4H₂O(g) ⇌ Fe₃O₄(s) + 4H₂(g)

• The forward reaction will be favored.

• The reaction rate will increase.

• The reverse reaction will be favored.

• No change will occur.

Tags

NGSS.HS-PS1-5

Substance A is a _________ and Substance B is a _________.

• reactant; product

• product; reactant

• catalyst; inhibitor

• solvent; solute

Tags

NGSS.HS-PS1-5

About how long did it take for the reaction to reach equilibrium?

• 1 min

• 1.5 min

• 3 min

• 5 min

What would most likely happen to the point of equilibrium if more product was added 1 minute after equilibrium was reached?

• The graph will show a sharp rise in the B line.

• A new equilibrium will be established.

• Both substances A and B will increase in concentration.

• All of the above will most likely happen.

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6