Concept Review: What is Chemistry

Changes in chemicals, or chemical reactions, take place [only in test tubes/all around us]

All around us

Atoms [are, are not] destroyed or created so mass [does, does not] change during a chemical reaction.

Are not, does not

A [physical, chemical] reaction rearranges the atoms that make up the reactant or reactants.

Chemical

Cooking an egg is an example of a ————- change

Chemical

Gasoline burning is an example of a———- change

Chemical

In a [physical/chemical] change, the identities of substance change and new substances form.

Chemical

Is milk souring physical or chemical?

Chemical

A chemical is any substance that has [definite/indefinite] composition

Definite

Gas particles are [close together, far apart] and are [attracted, not strongly attracted] to one another.

Far apart, not strongly attracted

Liquids have a [variable/fixed] volume

Fixed

The characteristics of a solid include [fixed/variable] volume and shape.

Fixed

Particles in a liquid are held [loosely, tightly] and [can, cannot] slip past each other

Loosely, can

The type and arrangement of [particles/crystals] in sample of matter determine the properties of matter.

Particles

Is ice melting physical or chemical?

Physical

Water evaporating is an example of a————- change

Physical

[Physical/Chemical] changes are changes in which the identity of a substance does not change. Thus the changes of state are [physical, chemical] changes.

Physical, physical

In the word equation hydrogen + oxygen + heat -> water, hydrogen is a [reactant/product] and water is a [reactant/product]. This is an example of a [physical, chemical] change.

Reactant; product, chemical

After a chemical reaction, the [same/different] atoms are present in the product.

Same

Most of the matter you encounter is one of [numerous/three] states of matter.

Three

Particles that make up solids are held [loosely/tightly] in a [flexible/rigid] structure, so the particles can [vibrate only slightly/flow past each other]

Tightly; rigid; vibrate only slightly

Gases have a [variable/fixed] volume and shape

Variable

Liquids have a [fixed/variable] shape

Variable

Milk souring is a ______ change.

chemical

The burning of wood is an example of a ____ change.

chemical

Bleaching a stain

chemical change

Lighting a match is an example of a

chemical change

Breath fogging a mirror

physical

Chopping wood is a ________ change.

physical

Ice melting is an example of

physical change