Chem

Question 1

What subatomic particle does the atomic number represent?

Answer 1

Number of protons

Question 2

If elements are in the same period, they have the same number of?

Answer 2

Valence shells

Question 3

If elements are in the same group, they have the same number of?

Answer 3

Valence electrons

Question 4

Compounds that involves the transfer of electrons are:

Answer 4

Ionic

Question 5

Compounds that involve the sharing of electrons are:

Answer 5

Covalent

Question 6

Ionic compounds consist of:

Answer 6

A metal and a non-metal.

Question 7

Covalent compounds consist of:

Answer 7

A non-metal and a non-metal.

Question 8

What are diatomic molecules and what do you need to know about them when writing chemical equations?

Answer 8

HOFBrINCL. They are a gas and there is two of them. Write like this: BR2, H2

Question 9

Three defining characteristics of acids.

Answer 9

Conduct electricity

Taste sour (if safe to taste)

Can cause severe burns (strong acids)

Question 10

What is an acids pH range?

Answer 10

pH<7

Question 11

How can you tell if it is an acid, just by looking at the formula?

Answer 11

It will always start with a hydrogen.

Question 12

Three defining characteristics of bases?

Answer 12

Conduct electricity

Taste bitter

Feel slippery

Question 13

What is a base’s pH range?

Answer 13

pH > 7

Question 14

How can you tell if it is a base, just by looking at its formula?

Answer 14

It will always end with OH.

Question 15

What two elements are found in all organic compounds?

Answer 15

Hydrogen and carbon

Question 16

In A + B > C + D, what are the products and what are the reactants?

Answer 16

C+D = products

A+B = reactants

Question 17

A reaction that requires energy to occur is known as an ______ reaction and feels ___________ to the touch

Answer 17

Endothermic, cool

Question 18

A reactions that produces energy when it occurs us known as an _________ reaction and feels _______ to the touch

Answer 18

Exothermic, hot

Question 19

What is the basic form of a combustion reaction?

Answer 19

CH4 + 2O2 > CO2 + H20

Question 20

What type of combustion occurs when there is a plentiful supply of O2?

Answer 20

Complete combustion

Question 21

What type of combustion occurs when there is a limited supply of O2?

Answer 21

Incomplete combustion

Question 22

What is the basic word equation for a neutralization reaction?

Answer 22

Acid + base > salt + H20

Question 23

What is special about a multi-valent element?

Answer 23

They are metals that are in the left side of the stair case. It’s an element that can take on more than one ionic charge.

Question 24

What are three identifying factors that determine is a reaction resulted in a physical change?

Answer 24

Change in size

Change in shape

Change in state

Question 25

Describe the indicators of a physical change.

Answer 25

Changes form but keeps its chemical composition, changes the way a substance looks, does not result in a new substance

Question 26

What are the 5 indicators that a reaction resulted in a chemical change?

Answer 26

Energy taken in it given off in the form of heat/light Formation of gas bubbles Formation of a solid (precipitate) Change in colour Formation of a different odour

Question 27

Describe the characteristics that determine whether a chemical change will occur

Answer 27

Something new is formed, starting materials change into something completely different., changes the way particles are linked together

Question 28

What is the basic premise of the conservation of mass?

Answer 28

In a closed system, mass of reactants equals mass of products

Question 29

What are three substances we can use to determine whether a solution is acidic or basic?

Answer 29

1. Litmus paper 2. pH paper 3. Synthetic indicators

Question 30

What is meant by the rate of chemical reaction?

Answer 30

The rate of reaction is how fast a reaction happens

Question 31

What are three factors that influence the rate of reaction?

Answer 31

1. Temperature 2. Surface Area 3. Concentration

Question 32

A group of charged elements that are covalently charged together

Answer 32

Polyatomic ion

Question 33

These elements have properties similar to both metals and non-metals

Answer 33

Metalloids

Question 34

A family of elements that are un reactive non-metals

Answer 34

Noble gasses

Question 35

A category of elements found on the periodic table that are lustrous, malleable, and ductile

Answer 35

Metals

Question 36

A family of elements that are generally soft solids and are very reactive with water

Answer 36

Alkali metals

Question 37

An element that can take on more than one ionic charge

Answer 37

Multivalent element