Classroom Chemistry

Question 1

adhesion

Answer 1

The force of attraction between the surface of unlike bodies such as a solid and a liquid.

Question 2

boil

Answer 2

To change from a liquid to a gaseous state.

Question 3

chemistry

Answer 3

The study of matter - its properties, composition, and changes.

Question 4

cohesion

Answer 4

The force of attraction between the particles (molecules) of a substance.

Question 5

decanting

Answer 5

To pour off the top layer without desturbing the layers or the sediment below.

Question 6

density

Answer 6

The amount of mass in a substance per unit of volume.

Question 7

distillation

Answer 7

The process of vaporizing and then condensing a liquid.

Question 8

filtering

Answer 8

The process of passing a mixture of a liquid and a solid slowly through paper or other porous substances in order to remove the solid from the mixture.

Question 9

gas

Answer 9

A state of matter in which the substance takes the shape of its container and is of low density compared to solids and liquids. Great expansion and contraction with changes in temperature and pressure.

Question 10

heterogeneous mixture

Answer 10

A mixture of varying composition; e.g. a mixture of soil and sand may have more of one component in one sample than in another sample of the same size taken from elsewhere in the mixture.

Question 11

homogeneous solution

Answer 11

A solution with uniform composition and properties throughout the solution. For example a cup of coffee, perfume, cough syrup, a solution of salt or sugar in water, etc.

Question 12

liquid

Answer 12

A state of matter in which the substance had definite volume but takes the shape of the container.

Question 13

mixture

Answer 13

All of the atoms or molecules in a mixture may come from a variety of substances. A mixture is a number of pure substances brought together. In most cases the pure substances can be isolated by relatively simple procedures.

Question 14

physical change

Answer 14

A change in a substance where no new substances are formed though the substance; itself, takes on different characteristics; e.g. a solid becoming a liquid. Physical changes are reversible changes;
i.e. the substance can be returned to it s original state or recovered from a mixture.

Question 15

product

Answer 15

A substance obtained from one or more other substances as a result of a chemical reaction.

Question 16

reactant

Answer 16

An element or compound that enters into a chemical reaction.

Question 17

saturated

Answer 17

Referring to a solution that is not able to hold anymore solute at that temperature.

Question 18

solid

Answer 18

A state of matter in which the substance has definite shape and volume.

Question 19

solute

Answer 19

The substance that is dissolved in a solution.

Question 20

solution

Answer 20

A homogeneous mixture in which the solute is uniformly distributed throughout the solvent.

Question 21

solvent

Answer 21

The substance that does the dissolving in a solution.

Question 22

suspension

Answer 22

A mixture in which very small particles of a solid remain suspended without dissolving.

Question 23

evaporation

Answer 23

A physical change from a liquid to a gas.

Question 24

crystal

Answer 24

A solid material with atoms and molecules that are arranged in a consistent repeating pattern, creating geometrical shapes. Salt, sugar, and snowflakes all contain crystals in solid form.

Question 25

surface tension

Answer 25

The property of the surface of a liquid that allows it to resist an external force, due to the cohesive nature of its molecules.

Question 26

evaporation

Answer 26

The process of turning from a liquid into a gas.

Question 27

dissolve

Answer 27

For a solid to become a part of a liquid so as to form a solution.

Question 28

chemical change

Answer 28

A change in substances that have reacted chemically. The original substance is changed to a new substance and cannot easily be recovered.

Question 29

soluble

Answer 29

Something that is able to be dissolved in a liquid (especially in water).

Question 30

indicator

Answer 30

Something that changes color at a specific pH value which can be used to monitor if a substance is an acid or a base. The indicators we looked at turned pink/red if acidic and blue/green if a base. Examples: China Rose, tumeric, litmus or purple cabbage.