Atoms and Matter

Question 1

Who discovered the proton, neutron, and electron?

Answer 1

P: E. Rutherford
E: J.J Thomson
N: J. Chadwick & E. Rutherford

Question 2

What’s the difference between laws and theories?

Answer 2

Laws are reliable observations while theories are models of behavior.

Question 3

Atomic number

Answer 3

Number of protons in the nucleus of an atom.

Question 4

Mass number

Answer 4

A counted number. Number of protons and neutrons in an atom.

Question 5

Z

Answer 5

Number of protons = Number of electrons.

Question 6

Isotopes

Answer 6

Atoms with the same atomic mass but with different mass numbers.

Question 7

Pure substances

Answer 7

Single components - elements
Multi components - compounds

Question 8

Physical and chemical separation

Answer 8

P: filtration
C: electrolysis

Question 9

What 3 scales are used to measure temperature?

Answer 9

Kelvin, Celsius, and Fahrenheit
(K), (C), (F).

Question 10

What numbers are considered significant?

Answer 10

non zeros, embedded zeros,

Question 11

What numbers are considered insignificant?

Answer 11

zeros at the end of the number, left of decimal point, in units of 10s, 100s, 1000s, or more

Question 12

Proton charge and mass

Answer 12

+1, 1.673 x 10^-24

Question 13

Neutron charge and mass

Answer 13

none, 1.673 x 10^-24

Question 14

Electron charge and mass

Answer 14

-1, 9.08 x 10^-28