Introduction to Chemistry

A scientist has two containers. Inside each container is a blue liquid. The liquids are substances. What can the scientist do to help find out whether these two liquids are both the same substance?

(Scientific Principal #1)

• Measure the density of the two liquids and compare the densities.

• Weigh each liquid and compare the weights.

• Measure the volume of each liquid and compare the volumes.

• Measure the temperature of each liquid and compare the temperatures.

Tags

NGSS.MS-PS1-2

Which one of the following is a substance?

(Scientific Principle #2)

• 
• 
• 
• 

Tags

NGSS.MS-PS1-2

Which one of the following cereals is NOT a mixture?

(Scientific Principle #3)

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• 
• 
• 

Soda contains a large amount of sugar. Why can't it be seen in the liquid?

(Scientific Principle #4)

• The sugar has a chemical reaction with the soda.

• The sugar dissolves in the soda.

• The sugar is taken out of the soda.

• The sugar was invisible before it was added to the soda.

Tags

NGSS.MS-PS1-2

You find a clear gem that is made of one substance. What could you do to identify whether the gem is a diamond?

(Scientific Principle #5)

• Measure its length and compare it to the length of other gems, including diamonds.

• Determine its shape and compare it to the shape of other gems, including diamonds.

• Determine its melting point and compare it to the melting point of other gems, including diamonds.

• Measure its mass and compare it to the mass of other gems, including diamonds.

Which one of the following characteristics will not help you tell whether two solids are the same or different substances?

(Scientific Principle #6)

• Color

• Hardness

• Shape

• Melting Point

Which is the least dense material?

(Scientific Principle #7)

• grape

• syrup

• oil

• cork

Which one of the following is a chemical reaction?

(Scientific Principle #8)

• New atoms are formed when substances are mixed together

• A solid material melts and becomes a liquid

• Atoms of the reactants rearrange to form a new substance

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which one change will produce a new substance?

(Scientific Principle #9)

• dissolving cocoa mix in water

• burning a piece of bread in a toaster

• heating water until it evaporates

• cooling water until if freezes

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

aluminum + copper chloride ---> copper + aluminum chloride

Name the reactant(s) in the reaction.

(Scientific Principle #11)

• Copper

• copper chloride

• Aluminum + copper chloride

• copper + aluminum chloride

Tags

NGSS.MS-PS1-1