Science Quiz #1

Question 1

Mixture

Answer 1

A mixture is made of two or more substances together in the same place but their atoms are NOT chemically combined.

Question 2

Heterogenous Mixture

Answer 2

A type of mixture with distinct materials that can be easily seen and sorted

Question 3

Homogeneous Mixture

Answer 3

A type of mixture with materials that are hard to see an sort

Question 4

Examples of how particles are separated

Answer 4

Size, filters, magnets, and evaporation

Question 5

Colloid

Answer 5

A heterogeneous mixture containing small, undissolved particles that do not separate or settle out if the mixture is left undisturbed

Question 6

Suspension

Answer 6

A mixture with particles that can be seen and easily separated by settling of filtration.

Question 7

Solutions

Answer 7

A homogeneous mixture of a solvent and one or more solutes

Question 8

Solvent

Answer 8

The part of the solution that is usually present in the largest amount.

Question 9

Solute

Answer 9

The substance that is dissolved by the solvent

Question 10

Molecular solutes

Answer 10

A molecule or particle that is distributed in a solvent

Question 11

ionic Solutes

Answer 11

electrolytes and nonionic solutes are nonelectrolytes

Question 12

Examples of physical properties

Answer 12

Boiling point, Freezing point, and density

Question 13

Solubility

Answer 13

A measure of how much solute will dissolve in the solvent.

Question 14

Effect of Temperature

Answer 14

The higher the temperature the faster the molecules move.

Question 15

What is an example of both Physical and Chemical Changes

Answer 15

Cooking

Question 16

Physical Change

Answer 16

A change that alters the physical form or appearance of a substance without changing it into a different substance

Question 17

Examples of Physical change

Answer 17

Bending, Crushing, Cutting, Melting, Freezing, and Boiling

Question 18

Chemical Changes

Answer 18

A chemical change is a change in matter that produces one or more new substances

Question 19

Reactants

Answer 19

Substances that undergo Chemical Changes

Question 20

Products

Answer 20

What reactants form

Question 21

Examples of Chemical Change

Answer 21

Burning and rusting

Question 22

When do chemical changes occur

Answer 22

When existing bonds break and form new bonds.

Question 23

Signs that a chemical reaction has occurred

Answer 23

Changes in energy and changes in properties.

Question 24

Examples of Properties changing

Answer 24

Change in color, Gas Production, Formation of Precipitate

Question 25

Precipitate

Answer 25

When a liquid turning into a solid

Question 26

Exothermic Reaction

Answer 26

A reaction that releases energy, usually in the form of heat.

Question 27

Endothermic Reaction

Answer 27

A reaction that absorbs energy

Question 28

Activation Energy

Answer 28

The minimal amount of energy needed to start a chemical reaction

Question 29

What might affect the rate of a chemical change

Answer 29

Surface area, temperature.

Question 30

Cutting paper

Answer 30

Physical

Question 31

Ice mealting

Answer 31

Physical

Question 32

Toast Burning

Answer 32

Chemical

Question 33

Rocket fuel burning

Answer 33

Chemical

Question 34

Sawing wood

Answer 34

Physical

Question 35

Metal rusting

Answer 35

Chemical

Question 36

Disappearing Puddle

Answer 36

physical

Question 37

Candle burning

Answer 37

Chemical

Question 38

Dry ice

Answer 38

Physical