Chemical Reactions Final Quiz

Aiden, Samuel, and Noah are in science class and mix some chemicals together. According to the Law of Conservation of Mass, what should they expect to happen to the total mass during their experiment?

• Mass can be created and destroyed.

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

• Mass is always lost in a chemical reaction.

• Mass is always gained in a chemical reaction.

Tags

NGSS.MS-PS1-5

Hannah and Samuel are having a debate in science class: When ice melts, is it a physical or chemical change? Can you help them decide and explain why?

• Chemical change, because new substances are formed.

• Physical change, because it involves a change of state.

• Chemical change, because it cannot be reversed.

• Physical change, because it changes color.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Michael and Evelyn are conducting a science experiment in class. They want to know: What are some signs that a chemical change has happened? (List at least 4.) Help them out!

• Change in color, formation of a precipitate, gas production, temperature change.

• Change in shape, size, texture, and state.

• Melting, freezing, boiling, and condensation.

• Dissolving, mixing, grinding, and cutting.

Tags

NGSS.MS-PS1-2

Benjamin and David are in science class, and they spot a water molecule labeled H₂O. Can you help them figure out how many hydrogen and oxygen atoms are in H₂O?

• 1 hydrogen and 2 oxygen atoms.

• 2 hydrogen and 1 oxygen atom.

• 2 hydrogen and 2 oxygen atoms.

• 1 hydrogen and 1 oxygen atom.

Tags

NGSS.MS-PS1-1

During a science experiment, Rohan and Aria noticed their beaker getting warm as they mixed two chemicals. What type of reaction did they just observe?

• A reaction that absorbs heat.

• A reaction that releases heat.

• A reaction that neither absorbs nor releases heat.

• A reaction that only occurs in cold environments.

Tags

NGSS.HS-PS1-4

Benjamin and Aria are observing an exothermic reaction in their science class. What do they notice happens to the temperature of the surroundings?

• It increases

• It decreases

• It remains the same

• It fluctuates

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

James and Avery are doing a science experiment. They notice that one reaction feels cold to the touch. What type of reaction is this?

• A reaction that releases heat

• A reaction that absorbs heat

• A reaction that produces light

• A reaction that releases sound

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Ava and Zoe are having a science debate! Ava says photosynthesis is exothermic, while Zoe thinks it's endothermic. Who is correct, and why?

• Exothermic, because it releases heat

• Endothermic, because it absorbs light energy

• Exothermic, because it absorbs light energy

• Endothermic, because it releases heat

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

James and Benjamin are observing an endothermic reaction in their science class. What do they notice happens to the temperature of the surroundings?

• It increases

• It decreases

• It remains the same

• It fluctuates

Tags

NGSS.HS-PS3-4

Charlotte and Arjun are conducting a science experiment and notice something interesting during a chemical change. How does the Conservation of Mass apply to what they observe?

• Mass is lost during a chemical change

• Mass is gained during a chemical change

• Mass remains constant during a chemical change

• Mass fluctuates during a chemical change

Tags

NGSS.MS-PS1-5