Unit 2 chapter 3 Test REVIEW

A mixture of one kind (sugar) of matter dissolved in another kind of matter (water).

• Mixture

• Solution

• Solvent

• Solute

When creating a salad dressing, Roland noticed his liquids were constantly separating. Connor told Roland to use lecithin, but he did not know what that was. How would you explain to Roland what lecithin is? 

• 
  To add flavor

• To act as a thickening agent

• To Emulsifiy ingredients and create a stable mixture

• To provide nutritional value

What happens when two solids are mixed together?

• They always form a new substance with different properties

• They always dissolve into each other to form a homogeneous solution.

• They may form a heterogeneous mixture or a homogeneous solution, depending on their properties.

• They always remain separate and do no interact with each other.

Tags

NGSS.MS-PS1-2

When mixing water and vinegar...

• They mix together immediately and form a homogeneous solution.

• They form a new substance with different properties.

• They react violently to produce a gas.

• They remain separate and do not mix.

Tags

NGSS.MS-PS1-2

Matter can be changed in many ways. Sometimes matter is changed and a new substance is created. This type of change is referred to as a chemical change. Which of the following are examples of chemical changes? 

Select 2. 

• dissolving salt

• burning leaves

• cutting paper

• painting a fence

• baking a cake

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When mixing water and oil together which of the following may occur? Select ALL that apply.

• They mix together immediately because their molecules are attracted and form a homogeneous mixture.

• They react to form a new substance.

• Their molecules repel and they separate into two distinct layers.

• They mix completely when an emulsifier is added to the mixture.

A hot air balloon pilot controls the balloon by adding or releasing hot air as the balloon flies high in the sky. Which of the following BEST describes why HOT air is used to make the balloon rise? As the temperature of air increases, what happens to the speed of its molecules?

• The hot air molecules stay still, which creates energy that helps the balloon float.

• The hot air molecules disappear after they are created, causing the balloon to rise.

• The hot air molecules are heavy, which creates energy and causes the balloon to rise in the air.

• The hot air molecules move quickly, bouncing off each other and the walls of the balloon to create energy.

Tags

NGSS.MS-PS1-4

Does mixing sand and water result in a chemical or physical change?

• chemical

• physical

• neither

• both A and B

Tags

NGSS.MS-PS1-2

Maxine poured two different substances together in a glass beaker. Below are her observations both before and after she mixed these substances. 

Before Mixing:Each substance was clear, room temperature, and Each substance was a liquid.

After Mixing: Substance was yellow, became hot, and a layer of bubbles formed and the liquid level got much lower.

Maxine makes a claim that a new substance formed as a result of mixing these two substances. What evidence from the data best supports this argument?

• The new substance had different properties.

• The new substance remained the same color.

• The new substance stayed the same temperature.

• There is no evidence to support Maxine's claim.

Tags

NGSS.MS-PS1-2

When matter is changing states from a liquid to a gas, some of the matter is destroyed.

• true

• false

Tags

NGSS.MS-PS1-4

NGSS.MS-PS1-5