Science

Question 1

What is decomposition?

Answer 1

A chemical reaction that breaks down compounds into simpler products.

Question 2

What is a replacement reaction?

Answer 2

A reaction in which one element replaces another in a compound; or when two elements in different compounds trade places.

Question 3

What is an exothermic reaction?

Answer 3

A chemical reaction that releases energy in the form of heat.

Question 4

What is an endothermic reaction?

Answer 4

Chemical reaction that absorbs energy in the form of heat.

Question 5

What is activation energy?

Answer 5

The minimal amount of energy that has to be added to get a chemical reaction to start.

Question 6

What is the law of conservation of mass?

Answer 6

The principal stating that matter is not created or destroyed during a chemical reaction.

Question 7

What is a reactant?

Answer 7

A substance that enters into a chemical reaction.

Question 8

SUBSCRIPT

Answer 8

The number in the chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound.

Question 9

COEFFICIENT

Answer 9

A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and products are involved in a reaction.

Question 10

PRECIPITATE

Answer 10

A solid that forms from a solution during a chemical reaction.

Question 11

MOLECULE

Answer 11

The combination of two or more atoms.

Question 12

CHEMICAL FORMULA

Answer 12

A combination of symbols that represent the elements in a compound.

Question 13

CHEMICAL EQUATION

Answer 13

A short easy way to show chemical reactions, using symbols instead of words.

Question 14

MIXTURE

Answer 14

Two or more substances that are mixed together but not chemically combined.

Question 15

SOLUTION

Answer 15

A well mixed mixture

Question 16

ELEMENT

Answer 16

A substance that cannot be broken down into any other substances by chemical or physical means.

Question 17

COMPOUND

Answer 17

A substance made of two or more elements chemically combined in a specific ratio, or proportion.

Question 18

CHEMICAL REACTION

Answer 18

The process in which substances undergo chemical changes that result in the formation of new substances.

Question 19

What is solubility?

Answer 19

A measure of how well a solute can dissolve in a solvent

Question 20

What is a suspension?

Answer 20

A mixture in which particles can be seen and easily separated by settling or filtration.

Question 21

What is a concentrated solution?

Answer 21

A mixture that has a lot of solute dissolved in it.

Question 22

What ions would you expect to find when a base dissolves in water?

Answer 22

Hydroxide ions

Question 23

How may salt form?

Answer 23

Salt can be formed by the reaction between an acid and a base

Question 24

What is carbon steel mostly used for?

Answer 24

Tools, machinery, rails

Question 25

What is sterling silver mostly used for?

Answer 25

Jewelry, tableware

Question 26

Hydroxide ion (OH-)

Answer 26

Polyatomic ion made of oxygen and hydrogen

Question 27

PH scale

Answer 27

Series of numbers that indicate the concentration of hydrogen ions in a solution

Question 28

Acid rain

Answer 28

Problem caused by gases that are released into the air as pollutants

Question 29

Neutralization

Answer 29

Reaction between an acid and a base

Question 30

PH of digestive system?

Answer 30

Mouth 7 Stomach 2 Small intestine 8

Question 31

What are three useful properties of ceramics?

Answer 31

Moisture resistant, does not conduct electricity, can withstand extremely high temperatures.

Question 32

What metal is the main element in all types of steel?

Answer 32

Iron

Question 33

What is brass mainly used for?

Answer 33

Musical instruments, faucets, jewelry, decorative hardware

Question 34

What two processes of digestion begin in the mouth?

Answer 34

Mechanical and chemical digestion

Question 35

What is a flexible strong natural polymer that gives shape to plant cells?

Answer 35

Cellulose

Question 36

What is formed from two or more substances combined as a new material with different properties?

Answer 36

Composite

Question 37

A compound that changes color in the presence of an acid or base

Answer 37

Indicator

Question 38

What ions would you expect to find when an acid dissolves in water?

Answer 38

Hydrogen ions