Unit 4 CSA Chemical and Physical Reactions

When combining magnesium metal and hydrochloric acid, the temperature increases.  What kind of change does this represent and what are the indicators of the change?

 

• Hydrogen gas is produced

• A new substance is formed

• This is a chemical change

• this is a physical change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Sugar dissolving in water to make sweet lemonade is an example of what type of change and what are the reasons why?

• This is physical change

• this is a mixture and can be separated or reversed.

• this is a chemical change

• No new substances are produced

Tags

NGSS.MS-PS1-2

Emma bakes a loaf of bread and then slices it.  Which of the following best identifies what has happened?

• chemical change and then physical change

• Physical change and then a chemical change

• chemical change only

• Physical change only

Tags

NGSS.MS-PS1-2

Water evaporating

• Physical change

• chemical change

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Dye hair blonde

• Physical change

• chemical change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Cutting hair

• Physical change

• chemical change

Mixing salt and water

• physical change

• chemical change

Silver tarnishing forming silver oxide

• physical change

• chemical change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Choose which answers best support the following graph: 

• The products have more energy then the reactants.

• The products have less energy than the reactants.

• Energy is absorbed.

• This is an endothermic reaction.

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A puddle of water evaporating is what type of process?  (HINT:  Think about the Kinetic energy of the water and the water vapor (gas).

• Endothermic

• Exothermic

Tags

NGSS.MS-PS1-4