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 Blank

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.