Science

Question 1

proton

Answer 1

positive charge

Question 2

neutron

Answer 2

neutral charge

Question 3

electron

Answer 3

negatively charged

Question 4

what is the electron configuration of the first 20 elements

Answer 4

2,8,8,2

Question 5

what is an ion

Answer 5

an atom with an overall charge

Question 6

what is a cation

Answer 6

a positively charged ions (more protons)

Question 7

what is an anion

Answer 7

a negatively charged ions (more electrons)

Question 8

what is a valence electron

Answer 8

electrons in the outer most shell of an atom

Question 9

what is an isotope

Answer 9

an element with a different atomic mass, they have the smae number of protons but differnet number of neutrons.

Question 10

what is half life

Answer 10

it is the time it takes for half of a sample of a radioisotope to decay

Question 11

types of radiation

Answer 11

alpha, beta, gamma

Question 12

alpha is..

Answer 12

a helium nucleus, it cant travel far adn is a very strong ioniser

Question 13

beta is…

Answer 13

an electron, which can travel many meters in the air but is a weak ioniser

Question 14

gamma is…

Answer 14

high energy light, which can travel very far in air, as well as through things such as lead but is a weak ioniser.

Question 15

what is density

Answer 15

it is how compacted the particles within a substance are

Question 16

conduction is…

Answer 16

direct contact between solid particles as a way of heat transfer.

Question 17

convection is…

Answer 17

the transfer of heat by liquids or gases to other objects (hot goes to cold)

Question 18

Radiation is…

Answer 18

transfer through light, absorbed by particles

Question 19

wavelenght is..

Answer 19

the length of one complete cycle eg. from the middle up down and back to the middle

Question 20

amplitude is…

Answer 20

the height of the wave from the middle

Question 21

a transveres wave is…

Answer 21

a wave that vibrates at a right angle to its motion. eg. an up and down wave

Question 22

frequency is…

Answer 22

the number of times a wave cycles per second (measured in hert)

Question 23

what changes wave speed

Answer 23

the medium it is travelling through

Question 24

what is a soundwave

Answer 24

it is a longitudinal wave that involves side to side vibrations of particles in a medium

Question 25

medium is

Answer 25

the material the wave travels through

Question 26

compression is

Answer 26

is the point where particles are closest, this is when the wave is at its highest pressure

Question 27

Rarefaction is

Answer 27

the point where particles are furthest apart, this is when the wave is at its lowest pressure

Question 28

Longitudinal waves are

Answer 28

waves that vibrate in the same direction it moves in. eg. left to right

Question 29

volume of a sound wave is

Answer 29

amplitude

Question 30

pitch of a soundwave is

Answer 30

the frequency

Question 31

What kind of wave is light

Answer 31

an electromagnetic wave

Question 32

what is reflection

Answer 32

it is when light bounces off a surface

Question 33

what is the law of reflection

Answer 33

the angle of incidence is equal to the angle of reflection

Question 34

Refraction is

Answer 34

when lights bends as it enters a new medium

Question 35

what is are the rules of refraction

Answer 35

when light enters a denser medium it bends inwards and outwards when it leaves

Question 36

the shells furthest from the nucleus have the _____ energy

Answer 36

highest

Question 37

what is the out most shell of an atom called and what atoms does it hold

Answer 37

the valence shell adn it holds the valence electrons