A scientist is working in the lab, with compounds containing carbon. She is most likely working in the field of

• Organic
• Inorganic
• Analytical
• Physical

The smallest unit of matter that retains the properties of that matter is

• a molecule
• a compound
• a mixture
• an atom

Which statement best describes an element?

• any combination of two or more atoms of different types
• a pure substance made up of only one kind of atom
• a substance containing only carbon atoms
• any kind of crystal

The atomic number is the number of ________ in the nucleus of an atom.

• protons

• neutrons

• electrons

Isotopes differ in the number of ________.

• protons

• neutrons

• electrons

Hydrogen gas (H2) is an example of a

• molecule

• compound

• both a molecule and a compound

Tags

NGSS.MS-PS1-1

The strongest types of bonds

• covalent

• ionic

• hydrogen

Tags

NGSS.HS-PS1-3

The bond that involves a transfer of electrons to achieve a complete outer shell

• ionic

• covalent

• hydrogen

A type of chemical bond in which a pair of electrons is unequally shared between two atoms

• polar covalent

• nonpolar covalent

• ionic covalen

Tags

NGSS.HS-PS1-1

A type of bond that gives 3-dimensional shapes to molecules like DNA

• hydrogen

• ionic

• covalent