Exploring Chemical Reactions in Physical Science

What is a chemical reaction?

• A process where one or more substances convert to form new substances with different properties

• A process where substances are dissolved in water

• A process where substances are physically separated

• A process where substances are mixed without changing their properties

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What are the substances called that enter a chemical reaction?

• Products

• Catalysts

• Reactants

• Enzymes

Tags

NGSS.MS-PS1-1

Which of the following is NOT a product of the reaction between baking soda and vinegar?

• Sodium acetate

• Water

• Carbon dioxide gas

• Hydrogen gas

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What does the law of conservation of mass state?

• Mass cannot be gained or lost in a chemical reaction

• Mass can be lost in a chemical reaction

• Mass can be gained in a chemical reaction

• Mass can be created in a chemical reaction

Tags

NGSS.MS-PS1-5

What is a coefficient in a chemical equation?

• A number written after a chemical element

• A number indicating the temperature of the reaction

• A symbol representing a chemical element

• A number written in front of chemical elements or compounds indicating the number of atoms or molecules

Tags

NGSS.MS-PS1-1

What type of reaction occurs when iron combines with oxygen to form iron oxide?

• Decomposition reaction

• Single replacement reaction

• Double replacement reaction

• Synthesis reaction

In a decomposition reaction, what happens to a complex substance?

• It combines with another substance

• It breaks down into simpler substances

• It forms a more complex substance

• It remains unchanged

Tags

NGSS.MS-PS1-1

What is an exothermic reaction?

• A reaction that only occurs in living organisms

• A reaction that absorbs energy

• A reaction that releases energy

• A reaction that does not involve energy

How does temperature generally affect the reaction rate?

• It has no effect on the reaction rate

• It decreases the reaction rate

• It increases the reaction rate

• It stops the reaction

Tags

NGSS.HS-PS1-5

What is a catalyst?

• A substance that is consumed in the reaction

• A substance that has no effect on the reaction rate

• A substance that increases the reaction rate but is not changed by the reaction

• A substance that decreases the reaction rate

Tags

NGSS.HS-PS1-5