The __________ at which one state of matter changes into another depends on how much energy is added or taken away from the substance.

In a chemical change, the substances that make up matter change into another substance with___________ physical properties and chemical properties.

Changes in___________,density,and state of matter can be signs of a chemical change

The formation of a(n)___________ substance is the only sure sign of a chemical change.

Formation of a(n)__________ might be signaled by bubbles or an odor.

Formation of a(n)__________, a solid that sometimes forms when two liquids combine, is a sign of a chemical change

A change in __________ might or might or not be a sign of a chemical change.It depends on whether a(n) ____________ forms.

Energy __________ is a sign that chemical change is involved.

Energy in the form of_________ is needed for chemical reactions such as photosynthesis.

______________ is chemical reaction that only occurs if plants are exposed to light.

Many changes can not be _________.

________ is always conserved during physical and chemical changes.

The law of conversation of mass states that the total mass before a(n)____________ change.

Spoiling foods are examples of_____________ change.

The mass of a unburned match plus the mass of the oxygen it reacts with _____________ the mass of the ashes and of all the grass given off when the match burns.