CH 9 review

Liz knows that changes can alter the looks or shapes of a substance. Cutting, melting, bending or crushing are examples of what kind of change?

• product

• reactant

• physical

• chemical

After reading about the changes that occur, Liz saw some rust on a pipe that was going inside her house. What kind of change is the formation of rust?

• physical

• chemical

• product

• reactant

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What kind of chemical reaction occurs in a hand warming product that is worn inside gloves?

• exothermic

• endothermic

• reactant

• product

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

NGSS.MS-PS3-4

What is the definition for activation energy?

• The minimum amount of energy needed to start a chemical reaction

• The maximum amount of energy needed to start a chemical reaction

• The minimum amount of energy needed to start a physical reaction

• The maximum amount of energy needed to start a physical reaction

Tags

NGSS.HS-PS1-5

What do we use to slow down a chemical reaction?

• catalyst

• inhibitor

• reactant

• product

Tags

NGSS.HS-PS1-5

what do we use to speed up a chemical reaction?

• catalyst

• inhibitor

• reactant

• product

Tags

NGSS.HS-PS1-5

What kind of chemical reaction occurs in a instant ice pack?

• endothermic

• exothermic

• chemical change

• physical change

Tags

NGSS.MS-PS1-2

Law of Conservation of mass states matter is never :_______________ or :__________________ .

• destroyed, created

• created, destroyed

• conjured, demolished

• demolished, cursed

Tags

NGSS.MS-PS1-5

this type of chemical reaction puts things together.                                         

  ex) 2mg + O2 → 2MgO

• replacement

• decompostion

• synthesis

Tags

NGSS.MS-PS1-5

compounds break down into simpler productsex) 2H2O2 → 2H2O +O2

• synthesis

• replacement

• decomposition