Chapter 1

Question 1

Where are the periods on the periodic table?

Answer 1

They are the horizontal numbers on the periodic table, there are seven rows

Question 2

What are the groups on the periodic table?

Answer 2

They are the vertical columns, there are 18 columns

Question 3

What is the atomic mass?

Answer 3

Its the weight of each element. (The decimal above the element)

Question 4

What is the atomic number?

Answer 4

The whole number on the bottom of the element

Question 5

What is chemistry?

Answer 5

Its the study of matter and how it changes

Question 6

What is an atom?

Answer 6

Atoms are building blocks

Question 7

What is an element?

Answer 7

Elements are the same atoms combined together

Question 8

Examples of an element

Answer 8

Oxygen (o), Aluminum (Al)

Question 9

What is a compound?

Answer 9

They are two or more elements combined

Question 10

Examples of a compound?

Answer 10

Aluminum oxide, Sodium Chloride (NaCl)

Question 11

Whats a pure substance?

Answer 11

1 compound

Question 12

Whats a mixture?

Answer 12

2 compounds or more

Question 13

What is nanotechnology?

Answer 13

A manipulation of matter with at least one dimension sized between 1-100 nanometers

Question 14

Whats a molecule?

Answer 14

Its a fixed number of atoms held together by chemical bonds in a certain spatial arraignment

Question 15

Whats a mole?

Answer 15

A unit used to compare the amount of substance

ex. Dozen=12

Question 16

Whats the unit of a mole?

Answer 16

A mole = 6.02 = 10^23

Question 17

What is the molar mass?

Answer 17

Sum of atomic mass of all elements present in a molecule or compound

Question 18

Example of Molar mass

Answer 18

Na atomic mass=22.990g
Cl=35.453g
22.990+35.453= 58.44g

Question 19

How to do mass percent? (Use Na And Cl)

Answer 19

Na atomic mass=22.990g molar mass = 58.44g
Cl=35.453g molar mass = 58.44g
22.990/58.44 100% = 39.33% (Na)
35.453/58.44100%=60.66%

Question 20

What does the mass number mean in an element?

Answer 20

The sum of protons and neutrons in an element. It also accounts for the majority of the mass of that atom or element

Question 21

What charge does a proton have?

Answer 21

Positive

Question 22

What charge does a electron have?

Answer 22

Negative

Question 23

What charge does a neutron have?

Answer 23

zero charge

Question 24

Where do you locate the positive charge?

Answer 24

At the center of the nucleus

Question 25

Where do you locate the negative charge?

Answer 25

It floats around the outside of the nucleus

Question 26

What is green chemistry?

Answer 26

Uses materials and processes that are intended to prevent or reduce pollution at its sources

Question 27

What is sustainable chemistry?

Answer 27

Designed to meet the needs of the present generation without compromising the needs of future generations

Question 28

What is matter

Answer 28

any substance that has mass and occupies volume

Question 29

What are the 4 stages of matter

Answer 29

solid, liquid, gas, plasmas

Question 30

What is a solid

Answer 30

particles of matter that are tightly packed together. They have a definite, fixed shape. Solids have the least energy of the 3 stages of matter

Question 31

What is a liquid

Answer 31

particles of matter are loosely packed and are free to move past one another. They have an indefinite shape and assume the shape of the container. They cannot be compressed and have a definite volume. They have less energy than gases but more energy that solids

Question 32

What is a gas state

Answer 32

particles of matter are far apart and uniformly distributed throughout the container. Gases have an indefinite shape and assume the shape of their container. They can be compressed and have an indefinite volume Gas has the most energy of the 3 states of shapes

Question 33

What happens where a solid goes to a liquid phase change?

Answer 33

the phase is called melting. A substance melts as the temperature increases

Question 34

What happens where a liquid goes to a solid phase change?

Answer 34

the phase is called freezing. A substance freezes as the temperature decreases

Question 35

What happens when a liquid goes to gas phase change?

Answer 35

the phase is called vaporizing. A substance vaporizes as the temperature increases

Question 36

What happens when a gas goes to a liquid phase change?

Answer 36

the phase is called condensing. A substance condenses as the temperature decreases

Question 37

What happens when a solid goes to a gas phase change?

Answer 37

the phase is called sublimation. A substance sublimes as the temperature increases

Question 38

What happens when a gas goes to a solid gas phase change?

Answer 38

the phase is called deposition. A substance undergoes deposition as the temperature decreases.

Question 39

Where are the metalloids on the periodic table?

Answer 39

On the steps, except aluminum

Question 40

Where are the metals on the periodic table?

Answer 40

everything to the left of the steps

Question 41

Where are the nonmetals on the periodic table?

Answer 41

everything to the right of the steps

Question 42

What is a physical property?

Answer 42

Its a characteristic of a pure substance that we can observe without changing its composition

Question 43

What does a physical property include?

Answer 43

appearance, melting and boiling points, density, heat and electrical conductivity, solubility and physical state

Question 44

What is a chemical property?

Answer 44

it describes a pure substance chemical reaction with other substances

Question 45

What is a physical change?

Answer 45

a change where the chemical composition of the sample doesn't change

Question 46

What does a physical change include?

Answer 46

includes changes in physical state or shape of a pure substance

Question 47

What is a chemical change?

Answer 47

a chemical reaction