Chemical Reactions

In a ___________change, a substance changes into a different substance.

• Physical
• Chemical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In a chemical reaction, bonds are broken and new bonds are formed that create new substances. The bonds that are broken are called what?

• Reactants
• Products
• Atoms
• Catalysts

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The Law of Conservation of Mass states

• that matter exists in all states and reacts the same
• that matter can only be changed into new substances by introducing a catalyst
• that matter exists in the same state throughout any chemical change
• that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants

Tags

NGSS.MS-PS1-5

How many Al atoms are in this compound?         4Al₂O₃

• 2
• 8
• 6
• 4

Tags

NGSS.MS-PS1-1

a copper penny turning greenish after a few years.

• Chemical Change
• Physical Change

Tags

NGSS.MS-PS1-2

Which of the following IS a physical change?

• Getting a haircut
• Rusty metal
• sour milk
• A compound

Tags

NGSS.MS-PS1-4

Which of the following 2 are chemical reactions?

• sugar dissolving in water

• water turning into steam

• burning wood

• mixing baking soda and vinegar

• tearing paper

Tags

NGSS.MS-PS1-2

In a chemical reaction, if the reactants are heated, the reaction usually happens

• slower

• faster

• at the same rate

• in a smaller volume

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

What does it mean for a reaction to be endothermic? Choose 2 of the following.

• When two substances react, the temperature of the mixture decreases.

• When two substances react, the temperature of the mixture increases.

• There is less energy going into the reactant to break the bond than there is energy leaving the product.

• There is more energy going into the reactant to break the bond than there is energy leaving the product.

• The amount of energy entering and leaving is the same.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The left side of the equation below is called

• Products
• Reactants

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2