College Chem - Ultimate review

The two most important properties of all matter are

• the ability to carry an electric current well and to hold electric charge.

• taking up space and having mass.

• being brittle and hard.

• being malleable and ductile.

Tags

NGSS.MS-PS1-5

An atom is

• the smallest unit of matter that maintains its chemical identity.

• the smallest unit of a compound.

• always made of carbon.

• smaller than an electron.

Noble gases are in Group 18, and are best known because they are

• unreactive.

• excellent conductors.

• rare.

• lanthanides.

Which of these symbols represents a unit of volume?

• mL

• mg

• mm

• cm

In oxides of nitrogen, such as N₂O, NO, NO₂, and N₂O₃, atoms combine in small whole-number ratios. This evidence supports the law of

• conservation of mass.

• multiple proportions.

• definite composition.

• mass action.

Experiments with cathode rays led to the discovery of the

• proton.

• nucleus.

• neutron.

• electron.

An atom is electrically neutral because

• neutrons balance the protons and electrons.

• nuclear forces stabilize the charges.

• the numbers of protons and electrons are equal.

• the numbers of protons and neutrons are equal.

Tags

NGSS.HS-PS1-7

According to Bohr, electrons cannot reside at ____ in the figure below.

• point A

• point B

• point C

• point D

How many quantum numbers are needed to describe the energy state of an electron in an atom?

• 1

• 2

• 3

• 4

The p orbitals are shaped like

• electrons.

• circles.

• dumbbells.

• spheres.