Unit 3 Quiz: Honors chemistry -- Study Guide

Question 1

A subatomic particle that has about the same mass as a proton, but with no electrical charge, is called a(n)

Answer 1

neutron

Question 2

Which one(s) have a mass of 1 amu?

Answer 2

proton and neutron

Question 3

What scientist discovered the nucleus?

Answer 3

Ernest Rutherford

Question 4

Which scientist discovered the electron?

Answer 4

JJ Thomson

Question 5

Which scientist discovered the neutron?

Answer 5

James Chadwick

Question 6

Which scientist thought the atom was the smallest particle

Answer 6

John Dalton

Question 7

Isotopes of an element contain different numbers of what?

Answer 7

neutrons

Question 8

All atoms of the same element have the same what?

Answer 8

atomic number

Question 9

A sulfur particle consists of 16 protons, 18 electrons, and 17 neutrons. Its charge is what?

Answer 9

-2

Question 10

How many protons are in 28 Al 3+?

Answer 10

13

Question 11

How many electrons are in 28 Al 3+?

Answer 11

10

Question 12

How many neutrons are in 28 Al 3+?

Answer 12

15

Question 13

As the mass number of the isotopes of an element increases, the number of protons what?

Answer 13

remains the same

Question 14

How many protons are in 32 S 2-?

Answer 14

16

Question 15

How many neutrons are in an atom of chlorine?

Answer 15

18

Question 16

Which part(s) of the atom has/have a positive charge?

Answer 16

protons and nucleus

Question 17

The atomic number is…

Answer 17

1. equal to the number of protons
2. found on the periodic table
3. always a whole number

Question 18

What is the mass number of an ion with 30 neutrons, 28 electrons, and a +2 charge?

Answer 18

60

Question 19

How many atoms are in one mole of copper?

Answer 19

6.022E23

Question 20

What is the molar mass of zinc?

report one place past the decimal

do not include units

Answer 20

65.4

Question 21

A balloon contains 4.50 x1022 atoms of helium gas. Calculate the mass of helium in grams.

do not include units

report with the correct number of sig figs

Answer 21

0.299

Question 22

How many moles of calcium are in 146.9 g of calcium?

Answer 22

3.663

Question 23

Calculate the number of atoms in 13.2 mol of copper.

Answer 23

7.94E24

Question 23

Calculate the number of moles in 12.0 mg of potassium

do not include units

report with the correct number of sig figs

Answer 23

0.000307 (3.06E-4)

Question 24

What happens when you add or subtract a neutron?

Answer 24

create an isotope with different mass

Question 25

What happens when you add or subtract and electron?

Answer 25

create an ion that has a negative or positive charge

Question 26

What happens when you add or subtract and proton?

Answer 26

create a new element with a different mass number

Question 27

When an atom loses an electron, it becomes a(n)

Answer 27

cation

Question 28

Which of the following best describes the mass within an atom?

Answer 28

Most of the mass is located in the nucleus.

Question 29

Most of the volume of an atom is occupied by the

Answer 29

electron cloud

Question 30

Find the mL in 500.0 mg of aluminum density of Aluminum is 2.700 g/mL do not include units

Answer 30

0.1852

Question 31

What is the name of the group that helium belongs to?

Answer 31

noble gas

Question 32

What reacts similarly to chlorine?

Answer 32

bromine

Question 33

Calculate and report with the correct number of digits 0.0034 m x 4.55 m do not include units

Answer 33

0.015

Question 34

Calculate and report with the correct number of digits 46.9 mL - 45.8 mL do not include units

Answer 34

1.1