Chemistry Semester B Final Review

According to the Law of Conservation of Mass, what is the mass of the smoke produced in this reaction?

• 1 kg

• 3 kg

• 5 kg

• 30 kg

Tags

NGSS.HS-PS1-7

What does the Law of Conservation of Mass state?

• Mass can be created in a chemical reaction.

• Mass is destroyed during a chemical reaction.

• Mass is neither created nor destroyed in a chemical reaction.

• Mass is always lost as heat in a chemical reaction.

Tags

NGSS.HS-PS1-7

If 10 kJ of energy is released in a chemical reaction, what type of process is this?

• Exothermic

• Endothermic

• Neutral

• Spontaneous

Tags

NGSS.HS-PS1-4

Which of the letters (A-D) represents activation energy?

• A

• B

• C

• D

The coefficients of the balanced chemical equation are:

• balanced

• 2, 3, 1

• 4, 3, 1

• 4, 3, 2

Tags

NGSS.HS-PS1-7

Which of the following best describes a reactant in a chemical reaction?

• A substance produced by the reaction

• A substance that starts the reaction

• A substance that is always a gas

• A substance that is always a liquid

What does the subscript “2” in SO₂ indicate?

• Two nitrogen atoms

• Two oxygen atoms

• Two molecules

• Two reactions

Tags

NGSS.MS-PS1-1

The coefficients of the balanced chemical equation are:

• balanced

• 1, 2, 1, 2

• 1, 2, 2, 1

• 2, 2, 2, 1

What is the main reason energy is required to break apart H₂O molecules?

• To create new atoms

• To overcome the bonds holding the atoms together

• To change the color of the molecules

• To increase the mass of the molecules

Tags

NGSS.HS-PS1-4

What effect does decreasing temperature have on reaction rate?

• Kinetic energy will decrease, decreasing the amount of collisions.

• Kinetic energy will increase, decreasing the amount of collisions.

• Kinetic energy will decrease, increasing the amount of collisions.

• No effect

Tags

NGSS.HS-PS1-5