Review: Unit 3 Lessons 1 & 2

Review: Unit 3 Lessons 1 & 2

Types of Matter & Physical and Chemical Properties/Changes

Elements

• cannot be broken down any further

• made up of just one substance

Open Ended

What is an example of an element?

Compounds

• made up of 2 or more substances

• chemically combined with bonds

• can be separated by chemical means

• Examples?

Open Ended

What is an example of an compound?

Mixtures

• 2 or more substances

• Physically combined

• can be separated by physical means

• Examples?

Homogenous mixture

• Uniformly mixed

• The same throughout; cannot see individual parts

Open Ended

What is an example of a homogenous mixture?

Heterogenous Mixture

• not uniformly mixed

• individual parts remain in tact

• Examples?

Open Ended

What is an example of a heterogeneous mixture?

Multiple Choice

A solution of sugar and water.

• element

• compound

• mixture

Multiple Choice

A 5g sample of Fe

• element

• compound

• mixture

Multiple Choice

Pure helium in a balloon

• element

• compound

• mixture

Multiple Choice

Carbon and oxygen bond together to make carbon dioxide

• element

• compound

• mixture

Multiple Choice

Copper and tin are mixed together to make bronze

• element

• compound

• mixture

Fill in the Blanks

One similarity between mixtures and compounds is that they are both made up of

or more substances.

Multiple Choice

Which of the following is an example of a heterogenous mixture?

• soap

• a salad with lettuce, olives, and tomatoes

• cup of coffee

• water

Multiple Choice

Which of the following lists only elements?

• H₂O + OH, MgCl₂

• H₂O, KF, Ne

• KCl, Ag, Au

• K, Cl, N

Multiple Choice

Sweet Tea, everything is mixed evenly and looks the same.

• Heterogeneous Mixture

• Homogeneous Mixture

Multiple Choice

Which one is NOT a heterogeneous mixture?

• a salad

• air

• muddy water

• a variety pack of candy

Physical Properties

• properties that can be observed without changing the substance

Physical Changes

• a change in the physical appearance of a substance

• does not form a new substance

• signs of a physical change include a change in shape, state of matter, color, texture

Open Ended

What is an example of a physical change?

Chemical Properties

• characteristics that can be observed by changing a substance into a new substance

Chemical Change

• a change that results in the formation of one or more new substances

• signs of a chemical change include fizzing, bubbling, formation of a gas, formation of odor, change in temperature

Open Ended

What is an example of a chemical change?

Multiple Choice

Chewing food to break it down into smaller particles represents a _________ change, but the changing of starch into sugars by enzymes in the digestive system represents a ___________change.

• Chemical then Physical

• Physical then Chemical

• Both Physical

• Both Chemical

Multiple Choice

A teacher is demonstrating physical and chemical changes to her class. Which action should they use to demonstrate a chemical change?

• Cutting a piece of paper with scissors.

• Folding a piece of paper into an airplane.

• Ripping a piece of paper with their hands.

• Burning a piece of paper with a match.

Multiple Choice

Which of the following is evidence of a physical change?

• New substance

• Shape Change

• Light produced

• Gas released.

Multiple Choice

When sugar dissolves in water a ______________ change occurs.

• Physical change

• Chemical Change

Multiple Choice

Hydrochloric acid reacts with potassium hydroxide to produce a salt, water,and heat.

• Chemical Change

• Physical Change

Multiple Choice

• physical change

• chemical change

Multiple Choice

fireworks exploding

• physical change

• chemical change

Multiple Choice

Glass bottle that is shattered

• Chemical Change

• Physical Change

Multiple Choice

Ice melting

• Chemical Change

• Physical Change

Multiple Choice

Which answer below makes a correct statement?

• Physical change only changes the color.

• Physical change only changes the size.

• Physical change changes the matter into something totally different.

• Physical change begins and ends with the same matter.