Science CT2

Question 1

What Does RAM stand for (in science)

Answer 1

relative atomic mass

Question 2

definition of ram

Answer 2

relative atomic mass takes into account of all the isotopes of that element

Question 3

what is the product of ram (like the type of mean)

Answer 3

WEIGHTED mean.

Question 4

how calulate RAM

Answer 4

abundance of isotope 1 X (times) mass of isotope, divided by 100. Do this for as many isotopes there are.

Question 5

in the modern PT the elements are aranged in order of?

Answer 5

atomic number

Question 6

how are e- arranged

Answer 6

in fixed energy levels called electron shells.

Question 7

electrons must fill the?

Answer 7

first shell before they csn move to the next.

Question 8

in compound names, the:?

Answer 8

metal comes first, then the non metal.

Question 9

(compound names) ide=

Answer 9

no oxygen

Question 10

(compound names) oxide=

Answer 10

just oxygen

Question 11

(compound names) ade=

Answer 11

oxygen present

Question 12

when solid turns into liquid what happens?

Answer 12

particles gain energy, break attractive forces, seperate from eachothers and move in random directions.

Question 13

what happens when liquid turn to solid?

Answer 13

particles loose energy, they move less/stop moving and arrange themselves in fixed positions due to the attractive forces.

Question 14

what happens in transition stages in heat curve? solid/liquid, liquid/gas

Answer 14

paricles abosrb heat energy, break free from attract forces and start to move.
Particles gain enough energy to break attractive forces and move freely.

Question 15

why dont substances turn to their liquid and gas states instnatly? and dont increase in heat?

Answer 15

They dont increase in heat as all the atoms must be spread out/ broken attractive forces to be able to turn into a gas.

Question 16

what is room temp?

Answer 16

20 degrees cel

Question 17

what are the instruments involved in filtration and crystalisation?

Answer 17

tripod, beaker, pestle and mortar, conical flask, funnel, evaporating basin/dish. Bunsen, filter paper, heat proof mat.

Question 18

condenser

Answer 18

a central tube surrounded by a seperate tupe with cold water flowing though.

Question 19

distilation

Answer 19

is a method of seperating mixtures of liquids based on their boiling points.

Question 20

paper chromatography?

Answer 20

is the seperation method that spereates coloured solude from a solution. e.g: inks, paints, food colouring.

Question 21

Rf is?

Answer 21

distance moved by spot (divided by) distance moved by solvent.

Question 23

start line:

Answer 23

drawn in pencilw ith ruler, where water starts and where the solvent is placed.

Question 24

periods go from?

Answer 24

left to right

Question 25

groups go from?

Answer 25

up to down

Question 26

mendeleev orderent elements how?

Answer 26

atomic mass left to right and properties up to down.

Question 27

mosely?

Answer 27

used xray analysis to show that elements properties are linked to atomic number.