science test gr8 water

Question 1

substances that dissolve in water

Answer 1

table salt, sugar, carbon dioxide, and oxygen

Answer 2

Water in the body helps to transport substances to all the tissues and organs. Water is an important solvent in which essential chemical reactions can take place. Water also keeps us cool: as sweat evaporates, it transfers thermal energy away from the body.

Question 3

particle theory

Answer 3

all matter is made up of particles
particles have empty spaces between them
particles are moving randomly at all times
particles move faster and spread farther apart when heated
particles attract eachother

Question 4

3 states of water and what they look like

Answer 4

gas- particles are spaced farther apart, have lots of energy, and move quickly in all directions
solid- clumped closer together, cannot move around, but they can vibrate
liquid- fairly spaced apart, particles vibrate faster and are free
to move around each other in all directions

Question 5

what is the water cycle

Answer 5

a continuous pattern in nature in which water moves as it changes state above, on, and below the surface of earth

Question 6

melting

Answer 6

the change of state from a
solid to a liquid; occurs when a solid
gains thermal energy

Question 7

sublimation

Answer 7

the change of state from
a solid to a gas without fi rst becoming
a liquid; occurs when a solid gains
thermal energy

Question 8

sustainability

Answer 8

being able to meet
the needs of the present without
compromising the ability of future
generations to meet their own needs

Question 9

salinity

Answer 9

a measure of the quantity of
dissolved salt in water

Question 10

concentration

Answer 10

a measure of the
quantity of dissolved substance
contained per unit volume of solution/the amount of solute in a particular volume
of solution.

Question 11

desalination

Answer 11

the technology of
removing salt and other minerals
from water

Question 12

contaminant

Answer 12

an undesirable
substance in a mixture

Question 13

fertilizer

Answer 13

a substance used to provide
nutrients to plants, usually for the
purpose of increasing crop production

Question 14

herbicide

Answer 14

a chemical substance used
to kill or slow the growth of certain
plants; often used to kill weeds that
compete with crop plants

Question 15

pesticides

Answer 15

a chemical substance used
to kill animal pests; often used to kill
insects that damage crop plants

Question 16

turbid

Answer 16

not clear; containing tiny
specks of sediment or other solid
matter

Question 17

thermal pollution

Answer 17

artificially
raising the temperature (for example,
of water)

Question 18

sewer system

Answer 18

a network of pipes
that transports dirty or used water

Question 19

blackwater

Answer 19

water that contains feces
and urine; also called “sewage”

Question 20

greywater

Answer 20

water that has been used
for cooking, laundry, bathing, or
similar tasks

Question 21

wastewater

Answer 21

water that has been
used or contaminated by human
activity; blackwater and greywater

Question 22

storm water runoff

Answer 22

water, usually
from precipitation, that runs off roofs,
lawns, and paved areas

Question 23

water treatment

Answer 23

the process of
removing potentially dangerous
substances from water to make
it more acceptable for a desired
end-use

Question 24

deposition

Answer 24

the change of state from
a gas to a solid; occurs when a gas
loses thermal energy

Question 25

freezing

Answer 25

the change of state from a
liquid to a solid; occurs when a liquid
loses thermal energy

Question 26

aquifer

Answer 26

a geological formation of
loose rock or soil that is saturated
with groundwater