Chemical Reactions Quiz

Lailah, Tatum, and Carigan are discussing their science homework. They are trying to define what Chemistry is. Tatum suggests that it is

• a. a characteristic of a substance that can be observed without changing the substance into another substance.

• b. the study of matter and how matter changes.

• c. anything that has mass and takes up space.

• d. a rapid reaction between oxygen and a substance called a fuel.

Tyler and Tyler were conducting a science experiment in their school lab. They were discussing how to confirm if a chemical reaction has occurred. Tyler suggested that the only sure evidence for a chemical reaction is

• a. the formation of a gas.

• b. a color change.

• c. the production of one or more new substances.

• d. changes in properties.

Noah found a white powder in the lab and Blake told him it's CaCO3. What does CaCO3 represent in this scenario?

• a. A symbol.

• b. A chemical formula.

Elijah is working on a science experiment and wants to slow down the chemical reaction. What should he use?

• a. An inhibitor.

• b. A catalyst.

Cameron and Kenna are conducting a chemistry experiment. They observed that sodium reacts with oxygen in a 2 to 1 ratio to produce sodium oxide. Which is the correct chemical equation for their observation?

• a. 4 Na + O₂ 2 Na₂O

• b. 2 Na + O₂ 2 NaO2

• c. Na₂O + O₂ 2 NaO

• d. Na₂ + O₂ Na₂O₂

TJ, Caden and J are conducting a science experiment. They are debating when the principle of conservation of mass holds true. They come up with different theories. Can you help them decide?

• a. Isla says it's only true for reactions that take place in open systems.

• b. Abigail believes it's only true for reactions that take place in closed systems.

• c. Aiden thinks it's true for reactions in both open and closed systems.

• d. They all agree that it's not true for any reactions at all.

Jesus, Clay, and Mason are conducting a chemistry experiment. They noticed that no matter how they mixed their substances, the total mass remained the same. In terms of chemical reactions, what principle does this observation illustrate?

• a. The principle of conservation of mass, which states that matter is not created or destroyed.

• b. The principle that the total mass of the reactants is greater than the total mass of the products.

• c. The principle that the total mass of the reactants is less than the total mass of the products.

• d. The principle that matter is not changed.

Hunter and Alliance are conducting a science experiment in their biology class. They are studying substances that act as biological catalysts by speeding up reactions in living things. What are these substances called?

• a. inhibitors.

• b. enzymes.

Cayden, Zayden and David are in a chemistry lab. They are trying to start a reaction but it's not happening. Which of the following actions can they take to supply the activation energy needed to begin the reaction?

• a. Aiden suggests they cool the reaction flask in an ice bath.

• b. Jackson suggests they add a catalyst.

• c. Anika suggests they heat the reaction flask on a hot plate.

• d. Jackson suggests they add an inhibitor.

During a science experiment, Kinlee and Layla noticed that their bottle of hydrogen peroxide eventually turned into a bottle of water and oxygen gas. Mrs. Ball asked them to identify this process. What is it an example of?

• a. synthesis reaction.

• b. decomposition reaction.