MC

8th Grade Integrated Science

Standard: 01

Objective: 02.  Observe and evaluate evidence of chemical and physical change.

ILO:

 

 

As Terry and Jean poured melted chocolate over their ice cream, they noticed that it became

hard.  They could assume that:

a.     The chocolate had changed phases, which is a physical change.

b.     The chocolate had changed phases, which is a chemical change.

c.     The chocolate had changed into a new substance, which is a physical change.

d.     The chocolate had changed into a new substance, which is a chemical change.

 

Correct Answer:  a

 

MC

8th Grade Integrated Science

Standard: 01

Objective: 02.  Observe and evaluate evidence of chemical and physical change.

ILO:

 

 

As Terry mixed some kool-aid for her little brother, she noticed that as the powder mixed into the water that the water changed to the same color as the powder.  She could assume that:

a.     the flavoring dissolved into the water, which is a physical change.

b.     the flavoring dissolved into the water, which is a chemical change.

c.     the flavoring created a new substance, which is a chemical change.

d.     the flavoring created a new substance, which is a physical change.

 

Correct Answer:  a

 

MC

8th Grade Integrated Science

Standard: 01

Objective: 02. Observe and evaluate evidence of chemical and physical change.

ILO:

 

 

Which of the following is an example of a physical change?

a.  evaporation in a swamp cooler

b.  electricity produced by a dry cell

c   digestion of a hamburger

d.  rusting of a car body

 

Correct Answer: a

 

 

 

 

 

MC

8th Grade Integrated Science

Standard: 01

Objective: 02. Observe and evaluate evidence of chemical and physical change.

ILO:

 

 

During an experiment Joe mixed two chemicals together.  The chemicals smoked and a very strange odor came from them.  This indicated that:

a.  one or more chemical changes had taken place.

b.  one or more physical changes had taken place.

c   a color change was going to happen next.

d.  the molecules had diffused throughout the mixture.

 

Correct Answer: a

 

MC

8th Grade Integrated Science

Standard: 01

Objective: 02. Observe and evaluate evidence of chemical and physical change.

ILO:

 

 

In a laboratory experiment you mix two colorless liquids together. After a few minutes you notice the liquid has turned purple.  What can you infer has happened?

a.  An acid has formed.

b.  A base has formed.

c   A chemical change has occurred.

d.  A physical change has occurred.

e.  An organic compound was produced.

 

Correct Answer: c

 

MC

8th Grade Integrated Science

Standard: 01

Objective: 02. Observe and evaluate evidence of chemical and physical change.

ILO:

 

 

Which of the following is an example of a chemical change?

a.  Baking soda in vinegar

b.  Freezing water

c.  Bending steel

d.  Sawing a board

 

Correct Answer: a

 

 

 

 

 

MC

8th Grade Integrated Science

Standard: 01

Objective: 02. Observe and evaluate evidence of chemical and physical change.

ILO:

 

 

Which of the following is an example of a chemical change?

a.  Bending a pop can

b.  Evaporation of milk

c.  Melting wax

d.  Burning paper

 

Correct Answer: d

 

MC

8th Grade Integrated Science

Standard: 01

Objective: 02.  Observe and evaluate evidence of chemical and physical change.

ILO:

 

 

When you turn up the thermostat on your furnace several things happen.  Which of these would

be considered a chemical change?

a.     Air circulates throughout the room.

b.     Fuel in the furnace burns.

c.     The temperature in the room increases.

d.     Heat in the room rises.

 

Correct Answer:  b

 

MC

8th Grade Integrated Science

Standard: 01

Objective: 02.  Observe and evaluate evidence of chemical and physical change.

ILO:

 

 

Kelley mixes and stirs two chemical solids together.  While stirring she notices that the beaker is

getting hot.  What is happening to the beaker?

a.     The reaction of the two chemicals is taking in heat.

b.     The reaction of the two chemicals is releasing heat.

c.     The beaker is getting hot because of the stirring.

d.     The beaker is getting hot because the solids are changing phase.

 

Correct Answer:  b

 

 

 

 

 

MC

8th Grade Integrated Science

Standard: 01

Objective: 02.  Observe and evaluate evidence of chemical and physical change.

ILO:

 

 

As Jean and Terry mixed the dry ingredients with the wet ingredients while making a snack, the mixture began to bubble.  They could assume that:

a.     a gas was being produced, therefore a chemical change was taking place.

b.     a gas was being produced, therefore a physical change was taking place.

c.     a liquid was being produced, therefore a chemical change was taking place.

d.     a liquid was being produced, therefore a physical change was taking place.

 

Correct Answer:  a

 

MC

8th Grade Integrated Science

Standard: 01

Objective: 02.  Observe and evaluate evidence of chemical and physical change.

ILO:

 

 

In a laboratory experiment, you mix two colorless liquids together.  After a few minutes you notice the liquid has turned purple.  What can you infer has happened?

a.     A physical change has taken place, and a mixture has formed.

b.     A chemical change has taken place, and a mixture has formed.

c.     A physical change has taken place, and a new substance has formed.

d.     A chemical change has taken place, and a new substance has formed.

 

Correct Answer:  d

 

MC

8th Grade Integrated Science

Standard: 01

Objective: 02.  Observe and evaluate evidence of chemical and physical change.

ILO:

 

 

Which substances are necessary for plants to produce sugar during photosynthesis?

a.     water, soil, chlorophyll

b.     water, carbon dioxide, chlorophyll

c.     water, minerals, cell wall

d.     water, roots, oxygen

 

Correct Answer:  b

 

 

 

 

 

MC

8th Grade Integrated Science

Standard: 01

Objective: 02.  Observe and evaluate evidence of chemical and physical change.

ILO:

 

 

What are the reactants for photosynthesis?

a.     soil and chlorophyll

b.     water and carbon dioxide

c.     water and minerals

d.     oxygen and carbon dioxide

 

Correct Answer:  b

 

E

8th Grade Integrated Science

Standard: 01

Objective: 02. Observe and evaluate evidence of chemical and physical change.

ILO:

 

 

Suppose you place several ice cubes in a glass of water that is at room temperature. Describe at least three physical changes that might occur over a period of time.

 

Ideal Answer: Possible answers which the students might suggest:

a.  Ice melts.

b.  Temperature of water decreases, then eventually increases back to room temperature

c.  Volume of water increases

d.  Water drops may condense on the outside of the glass

e.  Evaporation of water

 

Scoring Guide:

4 pts    Student shows exceptional though and insight. Descriptions include speed and distance of molecules and change in the shape of water.  At least three different physical changes are discussed.

3 pts    Student shows good thought.  Two different physical changes are described.

2 pts    Student shows fair thought.  One physical change is described.        

1 pts    Student shows little thought.  Changes are present, but none are correct.