Chemical reactions

Which ones do not show evidence of a chemical reaction?

• colour change

• production of gas

• production of heat

• production of light

• change in physical state- ie. crushing of a can, shredding paper

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The process when 2 or more substance react to form a 2 or more products with different chemical composition

• Products

• Reactants

• Chemical reaction

• Chemical equation

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

• Physical
• Chemical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

Which of the following is a physical change?

• A rusting bike
• Folding paper 
• Fireworks
• Baking a cake 

Tags

NGSS.MS-PS1-4

An endothermic reactions releases more thermal energy/heat. 

• True
• False

Tags

NGSS.HS-PS1-4

Which is not an indicator of a chemical reaction?

• Light is produced
• Heat is produced
• Color Change
• Change in state 

Tags

NGSS.MS-PS1-2

When a scientist mixed two chemicals, an exothermic reaction takes place. Which of the following would be evidence that the reaction was exothermic?

• a change of color
• a change of state
• a temperature decrease
• a temperature increase

Tags

NGSS.MS-PS1-4

Which of the following represents a chemical change?

• cutting a piece of paper with scissors
• cooling a mixture of air and kerosene vapor to obtain liquid kerosene
• burning a piece of notebook paper in the presence of oxygen
• heating water over a flame to its boiling point

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5