Elements, Compounds, Mixtures, Atoms, Ions, and Isotopes

Question 1

Element

Answer 1

material made up of one kind of atom

Question 2

The 7 diatomic elements

Answer 2

H2, O2, N2, Br2, I2, Cl2, F2

Question 3

Compound

Answer 3

material made up of 2 kinds of atoms in constant proportion

Question 4

Pure substance

Answer 4

elements and compounds

Question 5

Heterogenous mixture

Answer 5

clumpy

Question 6

Homogenous mixture

Answer 6

solution, evenly mixed

Question 7

Physical change

Answer 7

(can be undone) no new substances:

• boiling
• dissolving
• color
• conductivity

Question 8

Chemical change

Answer 8

(can’t be undone) new substances:

-flamability

Question 9

Size of nucleus

Answer 9

10^-15 m (100 000 times smaller than an atom)

Question 10

Size of atom and its name

Answer 10

10^-10 m (angstrom)

Question 11

Charge of an atom

Answer 11

protons - electrons

Question 12

mass of an atom

Answer 12

protons + neutrons

Question 13

How to find a weighted average of the atomic mass of an atom

Answer 13

mass # (percent) + mass # (percent)

Question 14

Proton charge, mass (kg and amu)

Answer 14

charge: +1 / mass (kg): 1.66 x 10^-27 / mass (amu): 1

Question 15

Neutron charge, mass (kg and amu)

Answer 15

charge: 0 / mass (kg): 1.66 x 10^-27 / mass (amu): 1

Question 16

Electron charge, mass (kg and amu)

Answer 16

charge: -1 / mass (kg): 9.31 x 10^-31 / mass (amu): 0

Question 17

Atomic number

Answer 17

number of protons

Question 18

Atomic mass

Answer 18

protons + neutrons

Question 19

A X Z

Answer 19

atomic mass, element, atomic number

Question 20

which isotope is the only one to have its exact weight on the periodic table

Answer 20

carbon