Term 1 revision

Question 1

Which subatomic particle was discovered by JJ thomson?

Answer 1

Electron

Question 2

What is the name of the atomic model that was proposed by JJ thomson?

Answer 2

Plum pudding

Question 3

Describe the plum pudding model?

Answer 3

The atom was a sphere of positive charge with negatively charged electrons scattered around the atom

Question 4

What did Ernest Rutherford direct at a thin gold leaf in 1905?

Answer 4

Alpha particles

Question 5

most alpha particles going straight through the gold foil tells us that

Answer 5

the atom is mostly empty space

Question 6

what did Neils bohr add to the Rutherford atomic model

Answer 6

electrons orbited the nucleus at specific distances

Question 7

who discovered the neutron in 1932?

Answer 7

James Chadwick

Question 8

How many times bigger is the atom compared to the nucleus?

Answer 8

10,000times

Question 9

What is atomic number?

Answer 9

Number of protons

Question 10

what is mass number?

Answer 10

sum of protons and neutrons in the nucleus

Question 11

What are isotopes?

Answer 11

Atoms that have the same number of protons but different number of neutrons

Question 12

what is the relative mass and charge of a proton?

Answer 12

Mass = 1 Charge = +1

Question 13

What is the relative mass and charge of a neutron?

Answer 13

Mass = 1 Charge = 0

Question 14

What is the relative mass and charge of an electron?

Answer 14

Mass = 0 charge = -1

Question 15

In what order we’re the subatomic particles discovered?

Answer 15

First: electrons
Second:protons
Third:neutrons

Question 16

What are group 1 elements called?

Answer 16

Alkali Metals

Question 17

What are group 7 elements called?

Answer 17

Halogens

Question 18

What are group 0 elements called?

Answer 18

Noble gases

Question 19

What is a compound?

Answer 19

A substance made of two or more elements that are chemically combined in fixed proportions e.g CO2 H2O O2 NaCl

Question 20

What is an element?

Answer 20

A substance that is made of only one type of atom. e.g H2 O2 Fe

Question 21

What is an ion?

Answer 21

Charged particles that have either gained or lost electrons

Question 22

What is the positive ion called?

Answer 22

cation

Question 23

What is a negative ion called?

Answer 23

Anion

Question 24

What is the function of the fine adjustment knob on a light microscope?

Answer 24

To adjust the focus of the microscope

Question 25

What is the function of the light source in a light microscope?

Answer 25

To direct light into viewers eyes

Question 26

Why was iodine solution added to the layer of onion cells when seen under a light microscope?

Answer 26

to stain the cells

Question 27

What is the function of nucleus?

Answer 27

Contains genetic information and control cell activities

Question 28

What is the function of chloroplast?

Answer 28

Size of photosynthesis

Question 29

What is the function of mitochondria?

Answer 29

Site of aerobic respiration

Question 30

What organelles do only plant cells have?

Answer 30

Cell wall, permanent vacuole, and chloroplast

Question 31

What is a eukaryotic cell?

Answer 31

Contain Nucleus and membrane-bound organelles

Question 32

What is a prokaryotic cell?

Answer 32

lack nucleus and membrane-bound organelles

Question 33

What is the change in sublimation?

Answer 33

Solid to gas

Question 34

why can’t steel be poured in its solid state?

Answer 34

Particles are in fixed positions

Question 35

What happens to the mass of solid steel as it melts?

Answer 35

stays the same

Question 36

Water undergoes a physical change and becomes steam. why is this a physical change?

Answer 36

The water will recover its original properties if the steam is cooled. the particles themselves stay the same

Question 37

Describe the direction of motion of the particles in a gas?

Answer 37

Random motion(all directions)

Question 38

What is temperature?

Answer 38

Measure of average kinetic energy of particles

Question 39

Where is true energy transferred to when a solid is melting?

Answer 39

To break the bonds