science

Question 1

what causes lightning

Answer 1

the negative charged at the bottom of a cloud are attracted to the positive charges on the ground .

Question 2

what is static electricity

Answer 2

term referring to electric charges that are stationary, or at rest

Question 3

how do you find the number of neutrons

Answer 3

atomic mass - number

Question 4

how do you find the valance electrons

Answer 4

atomic number - group number . If the atomic number is too small then that is the number of valance electrons

Question 5

what is contact

Answer 5

Electrons get passed from one object to the other when they touch

Question 6

what induction

Answer 6

Electrons in the object move away or towards another charged object that is placed close to it.

Question 7

term referring to matter having an excess of electrons (a negative charge) or a deficiency of electrons (a positive charge)

Answer 7

charged

Question 8

a property of matter having an excess of electrons (a nega¬ tive charge) or a deficiency of electrons (a positive charge)

Answer 8

electric charge

Question 9

term referring to electric charges that are stationary, or at rest

Answer 9

static electricity

Question 10

term referring to matter having neither a negative nor a positive electric charge

Answer 10

neutral

Question 11

a material that does not allow electric charges or heat to move freely on or through it

Answer 11

insulator

Question 12

a material that allows electric charges or heat to move freely on and through it

Answer 12

conductor

Question 13

a law stating that like electric charges repel and unlike electric charges attract

Answer 13

Law of Attraction and Repulsion

Question 14

charge carried by protons

Answer 14

positive charge

Question 15

what causes lightning

Answer 15

when the amount of charge becomes too much in the clouds the air is not in a position to hold onto the charge .
The negative charges at the bottom of the cloud attract to the positive charges on the ground .

Question 16

why isnt it safer in a field

Answer 16

because there is no conductor in a field for the electricity to move through so if you get struck the electricity is moving througout your body

Question 17

how does an electroscope charge by induction

Answer 17

iSince opposites attract, a countless number of negatively charged electrons are drawn upwards towards the top of the electroscope.

Question 18

what is an electric charge

Answer 18

a form of change either positive or negative that exerts an electric force

Question 19

a pure substance that is made up of 2 or more elements that are chemically combined .

Answer 19

compound

Question 20

is tomato soup a homogenous or a heterogenous mixture ?

Answer 20

homogenous because it looks like one thing yet is a mixture of different things

Question 21

a homogenous mixture mixture is also known as a mechanical mixture

Answer 21

false , heterogenous mixtures would be a good example of a mechanical mixture because it doesn’t look like one substance

Question 22

what does the particle theory of matter state ?

Answer 22

• all matter is made up of small particles
• these particles have an attraction force between them
• When particles are heated they move faster

Question 23

is a mixture of different and easily distinguishable materials

Answer 23

heterogenous mixture

Question 24

what is current electricity

Answer 24

Electric current is the movement of electrons through a wire. Electric current is measured in amperes (amps) and refers to the number of charges that move through the wire per second.

Question 25

For plants to make seeds , the pollen from the _____– of one flower needs to fertilize the ovule of another flower.

Answer 25

Anther .

Question 26

4 critters that are pollinators

Answer 26

bees , flies , hummingbirds and , moths and bats