Chemistry

Question 1

What is the law of conservation of matter?

Answer 1

Mass is neither lost or gained during a chemical reaction.

Question 2

What is an unbalanced equation often referred to as?

Answer 2

A skeleton equation

Question 3

Describe synthesis.

Answer 3

Two or more reactants combined to form one product

Question 4

Describe decomposition reaction

Answer 4

A single reactant decomposes into two or more reactants.

Question 5

Describe single displacement reaction

Answer 5

One element displaces another element

Question 6

Describe double displacement reaction

Answer 6

Atoms or groups of atoms are exchanged between two reactants, and two new products are formed

Question 7

Energy cannot be ____ or ____, only ____.

Answer 7

Created or destroyed, transferred

Question 8

During chemical reactions, chemical energy is often converted to what? (List 3)

Answer 8

Heat, light or sound

Question 9

Describe exothermic reactions

Answer 9

Energy is released to the environment. Combustion is a special type of exothermic reaction where large quantities of heat are released

Question 10

Can combustion be both complete or incomplete?

Answer 10

Yes

Question 11

Describe complete combustion

Answer 11

Box of oxygen, so all of the carbon atoms combine with oxygen to form carbon dioxide, and all of the hydrogen atoms combine with oxygen to form water

Question 12

Describe incomplete combustion

Answer 12

Not enough oxygen present, so carbon monoxide and solid carbon soot are produced in addition to carbon dioxide and water

Question 13

What is a hydrocarbon?

Answer 13

A hydrocarbon is a fuel that contains hydrogen and carbon

Question 14

CH4 = ?

Answer 14

Methane

Question 15

C3H8 = ?

Answer 15

Propane

Question 16

C2H5OH = ?

Answer 16

Ethanol (alcohol)

Question 17

C2H12O6 = ?

Answer 17

Glucose

Question 18

Describe endothermic reactions

Answer 18

Energy is absorbed from the environment

Question 19

Is photosynthesis an endothermic or exothermic reaction?

Answer 19

Endothermic

Question 20

Is water freezing in exothermic or endothermic reaction

Answer 20

Exothermic

Question 21

Is camp fire burning and exothermic or endothermic reaction?

Answer 21

Exothermic

Question 22

Is condensation an exothermic or endothermic reaction?

Answer 22

Exothermic

Question 23

Is a cake baking an exothermic or endothermic reaction?

Answer 23

Endothermic

Question 24

Is water boiling an exothermic or endothermic reaction?

Answer 24

Endothermic

Question 25

Is a hot pack for injuries an exothermic or endothermic reaction?

Answer 25

Exothermic

Question 26

Is a tree growing an exothermic or endothermic reaction

Answer 26

Endothermic

Question 27

What is a catalyst

Answer 27

A chemical that speeds up a chemical reaction, but does not get used up itself. They are written over the aero because they are neither react against nor products.

Question 28

What is corrosion

Answer 28

Corrosion is the break down of a metal as a result of chemical reactions with its environment

Question 29

What are 3 ways to prevent corrosion

Answer 29

1. Use a protective coating with rust inhabiting paint, chrome or plastic 2. Use resistant materials such as plastic 3. Using galvanizing steel because when cooled with a thin layer of zinc it protects steel cause zinc corrodes

Question 30

Horizontal rows are called what

Answer 30

Peroids

Question 31

Vertical columns are called what

Answer 31

Groups or families

Question 32

What is ionization

Answer 32

When atoms lose or gain electrons to become stable

Question 33

What are positively charged ions called

Answer 33

Cations

Question 34

What are negatively charged ions called?

Answer 34

Anions

Question 35

What is a binary compound

Answer 35

A type of pure matter containing two different elements in a fixed ratio

Question 36

What is a covalent bond

Answer 36

When atoms obtain full valence energy by sharing electrons

Question 37

Ammonia

Answer 37

NH3

Question 38

What are acids

Answer 38

Molecules that dissolve in water to produce hydrogen ions

Question 39

Name the 3 types of acids

Answer 39

Binary oxyacid and organic

Question 40

Multicellular organisms are made up of what

Answer 40

Specialized cells

Question 41

Totipotent cells have the ability to do what

Answer 41

To divide and produce all of the different cells

Question 42

Pluripotent cells have the potential to do what

Answer 42

Differentiate into any of the three germ layers

Question 43

What are the three germ layers

Answer 43

Endoderm, mesoderm, ectoderm

Question 44

Red blood cells

Answer 44

Carry oxygen in blood

Question 45

Muscle cells

Answer 45

Arranged in bundles called fibers and can contract

Question 46

Fat cells

Answer 46

Have large vacuole stores chemical energy

Question 47

Skin cells

Answer 47

Fits together tightly to cover body and protects the cells inside and reduces water loss

Question 48

White blood cells

Answer 48

Engulf bacteria and fights infection

Question 49

Nerve cells

Answer 49

Long, thin and have many branches, conduct electrical impulses to coordinate body

Question 50

Bone cells

Answer 50

Collect calcium from food, allow growth and repair phones