Chemistry Unit test

Question 1

What is a Element?
What is a Compound?
What is a Molecule?

Answer 1

• Element is a pure substance that cannot be further broken down
• Compound is a pure substance made up of two or more atoms chemically bonded together.
• A molecule is a particle made up of two or more of the same element.

Question 2

What is a diatomic element, whats the acronym

Answer 2

A diatomic element is an element that needs to be in pairs to be more stable. HOFBrINCl

Question 3

What is an ionic compound? What is a molecular compound? HWat type of bond does a molecular compound form?

Answer 3

An ionic compound is formed when a metal and non metal transfer valence electrons. A molecular compound is when two or more non-metals share electrons. This forms a covalent bond.

Question 4

Which of these is the correct name for the molecular compound : SF6

Answer 4

• Monosulfur hexafluordie
• Sulfur Hexafluoride
• Sulfur Fluoride

Question 5

What are the chemical formulas for these acceptions.
1 Hydrogen Peroxide 2 Water 3 Ozone 4 Methane 5 Ammonia 6

Answer 5

1. H2O2 2. H2O 3. O3 4. CH4 5. NH3

Question 6

What are the five indicators of a chemical reaction?

Answer 6

Colour change
Bubbling occurs
Heat or Light is given off or absorbed
A precipitate (solid) forms when two liquids are mixed.
Difficult to reverse

Question 7

What is the number used to balance a reaction called?

Answer 7

A coefficient

Question 8

What is the law concervation of mass?

Answer 8

The law concervation of mass states that no atoms can be created nor destroyed in a reaction.

Question 9

What is a ion?

Answer 9

A charged atom that has given or taken electrons

Question 10

A atom that GIVES electrons becomes a ______ charged ion
A atom that TAKES electrons becomes a _______ charged ion

Answer 10

positivly
negativly

Question 11

In an ionic compound the metal _____ the electrons
In an ionic compound the non metal _______ the electrons

Answer 11

Metal gives
Non metal takes

Question 12

These ions form ___________ ___________

Answer 12

Crystal Structures

Question 13

Can ionic compounds be reduced?

Answer 13

Yes

Question 14

What is a multivalent element?

Answer 14

An element that can have more than one charge

Question 15

What are the type of chemical reactions?

Answer 15

Combustion
Single displacement reaction
Double displacement reaction
Decomposition
Synthesis

Question 16

What three things do combustion reactions require?

Answer 16

Fuel (HydroCarbon) - Heat - Oxygen

Question 17

What are the two products of combustion reaction?

Answer 17

CO2 and water

Question 18

What is a synthesis reaction?

Answer 18

When the product is the reactants added together

Question 19

What is a decomposition reaction?

Answer 19

When a compound is seperated into its components

Question 20

WHat are the two exceptions for decompostition reactions?

Answer 20

Carbonates decompose into CO2 and metal oxide
Chlorates decompose into oxygen gas and metal chloride

Question 21

A metal needs to be _______ on the activity series from the metal in the compound for a single dispaplacement reaction

Answer 21

higher

Question 22

What is an acid?

Answer 22

An acid is a substanc e that when reacted with water create hydrogen atoms

Question 23

What is a binary acid?

Answer 23

Contains a hydrogen with a non-metal element

Question 24

What is a oxidizing acid

Answer 24

Contains hydrogen with a polyatomic ion

Question 25

How do you name a binary acid?

Answer 25

You find the element name for the non-metal. Add the prefix hydro-. Change the ending to -ic acid.

Question 26

What do you need to put in order to make HCl an acid?

Answer 26

(aq)

Question 27

What is a base?

Answer 27

A base is a substance that when reacting with water will produce hydroxide ions

Question 28

What does pH stand for?

Answer 28

Power of hydrogens

Question 29

The pH scale rangers from :

Answer 29

0 - 14

Question 30

pH < 7 pH = 7 pH > 7

Answer 30

is an acidic solution, more H1+ in solution is a neutral solution, equal amounts of H1+ and OH1- in solution is a basic solution, more OH- in a solution

Question 31

How much more acidic is : 8 - 5 4 - 2

Answer 31

1000 100

Question 32

What is a pH indicator?

Answer 32

A pH indicator is a substance that changes colour depending on the acidity of the solution.

Question 33

Acid will turn litmus paper - Base will turn litmus paper -

Answer 33

Red Blue

Question 34

What are some properties of an acid?

Answer 34

Sour Corrosive Conductive pH less than 7 Turns litmus paper red Reactive Produces hydrogen ions

Question 35

What are some properties of a base?

Answer 35

Bitter Corrosive Conductive pH more than 7 Turns litmus paper blue Not reactive Produces hydroxide ions

Question 36

What does a chemical formula tell us?

Answer 36

the type of atoms present the number of atoms present the type of compound

Question 37

What are metalic bonds?

Answer 37

Bonds formed by two metals, electrons are shared freely through each of the metal atoms

Question 38

Acids typically react with metals to produce ________

Answer 38

Hydrogen

Question 39

An acid + carbonate produces

Answer 39

CO2 + H2O + Product

Question 40

If the polyatomic acid ends in ate then it turns into __ ____ If the polyatomic acid ends in ite then it turns into ___ ____

Answer 40

ic acid ous acid

Question 41

Acid + Base -->

Answer 41

Water + Ionic compound

Question 42

What is lime/Ca(OH)2 used for?

Answer 42

To neutralize soil and bodys of water

Question 43

What is the formula for acid rain?

Answer 43

NOx + H2O --> HNOx (SOx + H2O --> HSO)