Holt Physical Science Ch 4 Review: Atoms

Question 1

Isotopes of an element have the same atomic ________ but different atomic _________.

Accepted Answer

number; mass

Question 2

According to Bohr's theory, an electron's path around the nucleus defines its

Accepted Answer

energy level

Question 3

Why do atoms have no charge?

Accepted Answer

Equal # protons and electrons

Question 4

Determine the mass of 0.75 mol of sulfur, atomic mass of 32 g/mol.

Accepted Answer

24 g

Question 5

Thomson’s study of cathode rays showed that atoms contain negatively charged particles called

Accepted Answer

electrons

Question 6

The mole is a SI unit that describes the

Accepted Answer

amount of a substance

Question 7

What is the atomic mass number equal to?

Accepted Answer

protons plus neutrons

Question 8

The first theory of atoms, was proposed by ____,

Accepted Answer

Democritus

Question 9

How do atoms behave in Bohr's model?

Accepted Answer

planets orbiting the sun

Question 10

An atom gains energy by absorbing a light particle called a(n)

Accepted Answer

photon

Question 11

The number of energy levels that are filled in atoms is determined by the number of

Accepted Answer

electrons

Question 12

The average atomic mass of cesium is 133 amu. What is the mass of 3 mol of cesium?

Accepted Answer

399 g

Question 13

The molar mass of krypton is 83.80 g/mol. So, 5.00 mol of krypton is _____g

Accepted Answer

419 g

Question 14

The nucleus of an atom has a(n) _______________________electric charge

Accepted Answer

positive

Question 15

You have 6.5 mol of chromium, which has a molar mass of 52g/mol, what is the mass?

Accepted Answer

338 g

Question 16

How many neutrons are in this atom?

Accepted Answer

61

Question 17

Thomson's model is also called

Accepted Answer

plum pudding model

Question 18

Which is NOT a part of Dalton's atomic theory?

Accepted Answer

Atoms are constantly in motion

Question 19

How many protons are in this atom?

Accepted Answer

6

Question 20

Oxygen's atomic number is 8, this means that oxygen has

Accepted Answer

8 protons

Question 21

The word atom comes from a Greek word that means "unable to be

Accepted Answer

divided

Question 22

What is true about the nucleus?

Accepted Answer

Contains protons and neutrons and is positively charged

Question 23

An atom of potassium has atomic mass of 39 & atomic # of 19, how many neutrons does it have?

Accepted Answer

20

Question 24

Molar mass is defined as

Accepted Answer

mass in grams of 1 mole of a substance

Question 25

Avogadro's constant is defined as the number of particles in

Accepted Answer

1 mole of a pure substance

Holt Physical Science Ch 4 Review: Atoms

Questions 25

Holt Physical Science Ch 4 Review: Atoms

Questions 25