Chapter 4

Question 1

Where can the atomic number be found and what does it mean?

Answer 1

Atomic number is the whole number on top of the symbol.

Is equal to the number of protons in an atom.

Question 2

What is the mass number and where can it be found

Answer 2

Mass number represents the number of particles in the nucleus

Always whole, does not appear on the table
Equals number of protons and neutrons

Question 3

How do you find the number of protons?

Answer 3

Atomic number on the top of the symbol

Question 4

How do you find the mass number?

Answer 4

Protons + neutrons

Question 5

How do you find the number of neutrons

Answer 5

Mass number - atomic number

Question 6

What is an isotope?

Answer 6

Atoms of the same elements

Question 7

What is a measured number?

Answer 7

Measured numbers are the numbers obtained when you measure a quantity such as your heigh weight or temperature.

Question 8

What are significant figures?

Answer 8

All non zero digits and zeros between digits
Not zeros that act as placeholders
Zeros at the end of a decimal number

Question 9

What are the rules for rounding off?

Answer 9

4 or less is dropped

5 or more is increased by 1 digit

Question 10

What is the equation for density?

Answer 10

Density is mass divided by volume

Question 11

How is matter classified?

Answer 11

By its composition; pure substances and mixtures

Question 12

How is a pure substance classified

Answer 12

Classified by; elements and compounds

Question 13

What is an element

Answer 13

Composed of one type of atom

Question 14

What is a combination of pure substances

Answer 14

A mixture

Question 15

How is energy measured

Answer 15

Joules/kalories

Question 16

What is kinetic energy

Answer 16

Energy of motion

Question 17

What energy is energy stored for later?

Answer 17

Potential energy

Question 18

What is specific heat?

Answer 18

Amount of heat that raises the temperature of exactly 1g of a substance by exactly 1 degree Celsius

Question 19

What is the equation of total heat?

Answer 19

Total heat= mass x temperature change x specific heat

Question 20

How is the periodic table broke down

Answer 20

Each row is a period

Each column is a group

Question 21

What are the groups specified for the periodic table?

Answer 21

Alkali metals
Alkali earth metals
Halogens
Noble gases

Question 22

What is Daltons atomic theory

Answer 22

All netter us made up of atoms
2 or more atoms is called a compound
Atoms are never created or destroyed during a chemical reaction

Question 23

What is an isotope?

Answer 23

Elements that have the same atomic number but different number of neutrons

Question 24

How do you find the number of protons?

Answer 24

Atomic number listed at the top of the symbol

Question 25

How do you find the atomic mass?

Answer 25

Protons + neutrons

Question 26

What 4 elements make up 96% of the human body

Answer 26

Oxygen carbon hydrogen and nitrogen

Question 27

What is a valence electron

Answer 27

Electron on the outermost shell energy level

Question 28

What is the equation to find the density

Answer 28

Mass divided by volume

Question 29

What is a covalent bond

Answer 29

Sharing of 2 valence electrons

Question 30

What is a non polar covalent bond

Answer 30

Equal sharing of electrons

Question 31

What is polar covalent bond

Answer 31

Unequal sharing of electrons

Question 32

What is the definition of electronegativity

Answer 32

The tendency of a covalently bonded atom to attract shared electrons

Question 33

What is a non metal + metal

Answer 33

Ionic bond

Question 34

Non metal + non metal

Answer 34

Polar covalent bond

Question 35

Non metal + non metal with a electronegativity of 0.

Answer 35

Non polar covalent