Physical and Chemical Changes

Grab your Notebook

On the next page in your notebook after your notes write down
1. definitions of physical changes
2. definitions of chemical changes
3. key indicators of each type of change.

Multiple Choice

A ___ change causes the substance to change to a new substance with different properties.

• Physical

• Chemical

Multiple Choice

A ____ change only changes the look of the substance but NOT the chemical make-up.

• Physical

• Chemical

Multiple Choice

The metal of a nail reacted with oxygen and water, and formed a new substance called rust.

• This is a physical change.

• This is a chemical change.

Multiple Choice

What is the evidence of a chemical change when the baking soda was mixed with the vinegar?

• color change and bubbles

• temperature change and bubbles

• formation of a precipitate

• temperature change and formation of a precipitate

Multiple Choice

There are characteristics that differentiate a chemical change from a physical change.  Which statement describes a physical change?

• Iron combines with oxygen to form rust

• Lead is heated and becomes melts into a viscous liquid.

• Sodium metal reacts explosively with oxygen

• Calcium is added to acid and hydrogen gas is produced

Multiple Choice

Lilly performs a lab about physical and chemical changes in her chemistry class.  She mixes sugar into water, until the sugar is completely dissolved.  Her lab partner Stephen thinks it is a chemical change, but Lilly disagrees. 

• They are both correct. It is a physical and a chemical change.

• Lilly is correct. Dissolving sugar in water is a physical change.

• Stephen is correct. Dissolving sugar in water is a chemical change.

• They are both wrong. No change occurred.

Multiple Choice

Jatorian is exploring the properties of iron. She takes a large iron nail and finds that the nail does not attract other metal objects. Next, she uses a battery and copper wire to transform the nail into an electromagnet. When she connects the circuit, the nail becomes magnetic and can pick up small metal objects like paper clips. This is shown in the illustration below.

What best describes what has happened to the iron in the nail that causes it to become magnetic?

• A physical change has occurred, because the chemical properties of the iron remain the same.

• A physical change has occurred, because there is a chemical attraction between the iron and paper clips.

• A chemical change has occurred, because there is a chemical attraction between the iron and paper clips.

• A chemical change has occurred, because the chemical energy in the battery is transformed into magnetic energy in the iron.

Multiple Choice

Review the information in the graph. Which of these statements is true?

• The change from ice of liquid water is a chemical change.

• The change from liquid water to water vapor is a physical change.

• It takes the same amount of time for ice to melt as it does for liquid water to become water vapor.

• The change from ice to liquid water to water vapor shows a decrease in mass due to the changes in states of matter.

Multiple Choice

Which of the following is NOT an example of a physical change?

• crumpled paper

• shrunken clothing

• pencil sharpening

• rust

Multiple Choice

A change where one or more new substances are created.

• physical

• chemical

Multiple Choice

In the video, you saw a rusted nail. The rusting of iron needs

• Hydrogen and Oxygen

• Air and Water

• Air and Gas

Multiple Choice

The rusting of the nail was a

• Physical Change

• Chemical Change

Multiple Choice

In the video, "Elephant Toothpaste,'' what kind of change does the elephant toothpaste demonstration show?

• Physical Change

• Chemical Change

Multiple Choice

In the video, "Elephant Toothpaste," what evidence did you observe that made you come to that conclusion?

• Freezing

• Melting

• Rusting

• gas (bubbles)

Multiple Choice

In "Color changing milk" different food colorings were added to a tray of milk then a cotton swab was twirled in the milk to make some dramatic color patterns. Based on your observations, is this a physical change or chemical change?

• Physical Change

• Chemical Change

Multiple Choice

In the demonstration "Color changing milk" can we use "color change" as evidence that it was a chemical change?

• Yes, color change is ALWAYS evidence of a chemical change

• No, color can be evidence of a chemical change but not when you apply the color. This was a physical change.

Multiple Choice

In the video, a pan of boiling water was thrown into the air, evaporating almost instantly. This is an example of a ________

• Physical Change

• Chemical Change

Multiple Choice

In the video, boiling water evaporated almost instantly in -45 degree cold. Which of the following statements is true?

• It is a physical change because evaporation is a State of Matter change.

• It is a chemical change because evaporation is a state of matter change

Multiple Choice

Is it a physical or chemical change?

• Physical

• Chemical

Multiple Choice

Is it a physical or chemical change?

• physical

• chemical

Multiple Choice

Is it a physical or chemical change?

• Physical

• Chemical

Multiple Choice

Rotting banana

Is it a physical or chemical change?

• Physical

• Chemical