8th grade unit 2

Which subatomic particle has a positive charge?

• proton

• electron

• neutron

• all particles

Which model of the atom first introduced the idea of a nucleus?

• Dalton's model

• Thomson's model

• Rutherford's model

• Bohr's model

What information does the atomic mass of an element provide?

• the sum of electrons and protons in an atom

• the difference between the number of protons and electrons

• the number of protons and neutrons in an atom

• the number of isotopes

What is the atomic number of an atom?

• the number of protons and neutrons

• the number of neutrons

• the number of electrons and neutrons

• the number of protons

Two atoms that are isotopes of one another must have the same number of what?

• protons

• neutrons

• electrons

• all particles

What is the smallest particle representing water?

• a hydrogen atom

• a molecule

• an oxygen atom

• diatomic oxygen

Which property is a physical property?

• malleable

• easy to digest

• does not burn

• becomes moldy quickly

What state of matter can be compressed?

• solids

• liquids

• gases

• solids, liquids, and gases

Which statement best describes the difference between a physical change and a chemical change?

• a chemical change does not result in a new substance being formed, whereas a physical change does

• a physical change is a change from one state of matter to another; a chemical change results in a new substance formed

• a physical change produces a new element, and a chemical change results in a bond breaking between atoms

• a chemical change results in a new element being formed, and a physical change results in a new compound being formed

Where are nonmetals located in the periodic table?

• along the upper right side

• along the upper left side

• in the middle

• along the bottom