CHE 021 - LESSON 2

Question 1

Smallest possible unit into which matter can be divided, while still maintaining its properties.​

Answer 1

ATOMS

Question 2

Defined as 1/12 of the mass of the carbon-12 atom.​

Answer 2

1 atomic mass unit (amu)

Question 3

It has a mass of about 1 (1.007) amu.​

Answer 3

PROTON

Question 4

It has a mass of about 1 (1.008) amu.​

Answer 4

NEUTRON

Question 5

It has a very small mass, 0.000549 amu.​

Answer 5

ELECTRON

Question 6

The alphabet to the language of molecules.​

To make molecules, you must have?

Made of atoms. While the atoms may have different weights and organization, they are all built in the same way.​

Answer 6

ELEMENTS

Question 7

Atomic number equals the number of what?

Answer 7

PROTONS or ELECTRONS

Question 8

Atomic mass equals the number of what?

Answer 8

PROTONS + NEUTRONS

Question 9

Counting Protons, Neutrons, and Electrons​ (REVEAL ANSWER)

Answer 9

TO GET Protons: See only the Atomic Number.

TO GET Neutrons: Mass Number minus the number of protons.

TO GET Electrons: If it’s an atom, the protons and electrons must be the SAME so that it is has a net charge of zero (equal numbers of + and -)​

If not: it is an ION.