properties that can be observed without changing the identity of the substance

• chemical

• physical

• changed

• absolute

Which is an example of a chemical change?

• water turning red when food dye is added

• water melting from ice to liquid when heat is added

• water mixing with sodium to make fire and heat

• water adhering to a window when it rains

A representation of something that scientists want to study.

• scientific theory

• scientific model

• scientific hypothesis

• scientific phenomenon

Which state of matter has the least kinetic energy?

• solid

• liquid

• gas

• plasma

What charge do protons have?

• Negative

• Positive

• No charge

The nucleus of an atom is composed of which subatomic particles?

• protons & electrons

• neutrons & electrons

• protons & neutrons

• electrons only

A covalent bond occurs between

• a metal & nonmetal

• 2 metals

• 2 nonmetals

An ionic bond occurs between

• a metal & nonmetal

• 2 metals

• 2 nonmetals

Can you identify an atom only by the number of neutrons?

• Yes

• No

Can you identify an atom only by the number of protons?

• Yes

• No