physical and chemical changes

...... is a chemical change in green plants that produce energy and oxygen.

...

photosynthesis is a chemical reaction in green plants that produces energy and oxygen

...

photosynthesis is an important chemical reaction on earth

...

..... can play a large role in the physical change of matter

energy

all chemical changes occur at the same speeds

false

chemical changes occur at the same speeds

false

in a chemical change the same substance is formed

false

ina physical change matter cannot change its shape.

false

matter always stays the same

false

rust is a substance produced by iron reacting with water

false

...... describes the ability of a substance to burn

flammability

a clue that a chemical change is occuring in a burning flame is that ...... is given off.

heat

in a chemical change a..... substance is formed.

new

ina chemical change, a ..... substance is formed.

new

ice melting is an example of a ..... change

physical

ice being broken down into small bits is an example of a...

physical change

a chemical ..... is a way to describe how matter reacts with other matter.

property

in a physical change the matter does not change...

property

a chemical .... is the chemical change in which one or more substances change.

reaction

...... is the substance that is produced by iron reacting with oxygen in the air.

rust

........ does not always stay the same and can undergo physical and or chemical changes

solids

a chemical change is a process by which a certain substance becomes a different substance.

true

a physical change is a change in size shape or phase of matter without the matter changing chemically

true

chemical reactions occur when two or more substances combine to form a new substance

true

every time you move, a chemical change occurs

true

heat is a clue that chemical change is occuring

true

temperaturecan play a big role in physical changes

true

the ability to burn is a chemical property called flammability

true

flammability is the chemical property describing how a substance.........

burns

chemical changes occur at ..... speeds

different