Chemical and Physical Changes in Chemistry

Boiling is the term we use to describe which phase change?

• Solid to a liquid
• Solid to a gas
• Gas to a liquid
• Liquid to a gas

When a substance changes from a solid to a liquid it is called

• Evaporation
• Condensation
• Freezing
• Melting

Which of the following occurs when a liquid becomes a gas? Use the image to help answer this question

• the particles slow down
• the particles jump away from one another
• the particles move closer together

Physical Properties are best described as...

• The look, feel, taste, sound, or smell of an object.
• Stay on the surface level in a liquid.
• Drop below the surface level in a liquid.
• Anything that has mass and takes up space.

William put a sugar cube in a cup of hot water. After a period of time, what happened to the sugar cube?

• It dissolved.
• It stayed on the bottom of the cup.
• It evaporated.
• It changed color.

what is the definition of chemical change?

• any change that results in the formation of new chemical substances. 
• changing clothes
• matter cannot be created or destroyed, only change form
• changes affecting the form of a chemical substance, but not its chemical composition.

Which one is the definition of chemical property?

• a property or characteristic of a substance that is observed during a reaction where the chemical composition of a substance is changed
• any change that results in the formation of new chemical substances
• combustibility

What is the definition of physical change?

• any change that results in the formation of new chemical substances. 
• rusting
• changes affecting the form of a chemical substance, but not its chemical composition.
• any property that is measurable, whose value describes a state of a physical system

Which one is a chemical change?

• density
• color
• rust 
• ice melting 

One cup of water is left outside for two days when it was checked there was only half a cup left. What happened?

• evaporation; chemical change
• condensation; physical change 
• evaporation; physical change
• condensation; chemical change