Physical and Chemical Changes

Which of the following is a chemical change?

• water freezes to form ice
• sugar dissolves in water
• gasoline burns in a car engine
• a piece of metal expands when it is heated

What type of change occurs when a new substance is formed that has different properties from the original substances?

• chemical change

• nuclear change

• physical change

• mutation

A chemical change is different than a physical change because in a chemical change...

• chemicals are used.

• molecules do not physically touch.

• a new substance is formed and in a physical change, no new substance is formed.

• the change can be seen but in a physical change it cannot.

Physical change is

• A change of matter from one form to another without turning into a new substance.

• A change that occurs when one or more substances produce new substances with different properties.

• The changes that happen to substances during a chemical change.

• The temperature at which a solid becomes a liquid. The melting point of water is 0 °C.

Which of these answers is an example of a chemical change?

• freezing fruit juice
• slicing a potato
• boiling water
• copper metal turning green

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 substance, but not its chemical identity.

• any property that is measurable, whose value describes a state of a physical system

Which of the following examples provides evidence of a PHYSICAL change?

• Wood is burned and releases ash and smoke

• Iron rusts over time

• When mixed, baking soda and vinegar form gas bubbles

• Boiling water bubbles when heated

Which is an example of a different substance being formed?

• glass breaking

• metal melting

• water freezing

• wood burning

Students observed a piece of iron change from shiny to rusty. What has caused this to occur?

• a chemical change

• a heat reaction

• a cold reaction

• a physical change

Which statement best describes what is happening in the images?

• a physical change

• a chemical change

• both a physical and a chemical change

• dissolving