ATOMS, STRUCTURE, AND EQUATIONS

Question 1

What is the conversion from cm^3 to dm^3

Answer 1

Divide by 1000 1dm=10cm

Question 2

Is the atomic number the big or small number on a periodic table element

Answer 2

smaller number

Question 3

What is the bigger number on the element

Answer 3

the atomic mass

Question 4

true or false, the atomic number is the same number of the amount of Protons

Answer 4

true

Question 5

What charges do ELECTRONS and PROTONS have

Answer 5

Protons=1, Electrons= -1

Question 6

What is the EQUATION to find number of NEUTRONS

Answer 6

(ATOMIC MASS - ATOMIC NUMBER)

Question 7

What is the difference between an Element, a Compound and a Mixture

Answer 7

• An element is already in its simplest form and contains ONLY 1 type of atom
• Compounds are 2 or more DIFFERENT elements chemically bound together
• Mixtures are different elements mixed together but NOT CHEMICALLY BONDED, so CAN be separated

Question 8

When is filtration used

Answer 8

to separate solids and liquids

Question 9

What is crystallization?

Answer 9

separates a solute from a solution

Question 10

What separation technique separates a MIXTURE of liquids AND HOW?

Answer 10

fractional distillation/simple distillation, can separate a mixture of liquids by, evaporating liquids as they will have different BOILING POINTS

Question 11

How many electrons can each SHELL hold

Answer 11

first: 2
Second: 8
third: 8
fourth: 8

Question 12

How do you work out Mr (relative atomic mass)

Answer 12

Add the atomic mass of each atom together, some will have more than 1 so you then have to multiply the atomic mass by that number, then add.

Question 13

How are moles calculated

Answer 13

Mass/ total Mr = moles

Question 14

how many moles of Magnesium Oxide are there in 60 grams of MgO?

Mr of Mg=24
Mr of O=16

Answer 14

1.5 mol (moles)

Question 15

What is EMPIRICAL FORMULA

Answer 15

the simplest (whole) number ratio of atoms of EACH element in a compound

IT IS found by DIVIDING the mass of the atom by the Mr of the atom. Then it is put into a ratio

Question 16

calculate the empirical formula of 5 grams of X which forms a compound with 10 grams of Y

Mr of x=2
Mr of y=2

Answer 16

5/2=2.5 (x)
10/2=5 (y)
2.5 : 5➜ 1 : 2 ➜ XY₂

Question 17

Definition of percentage yield and the equation

Answer 17

When we work out an equation the outcome is A theoretical YIELD

but the actual PERCENTAGE YIELD is the actual outcome vs the theoretical yield

THE EQUATION IS
((Actual outcome /Theoretical outcome) *100)

Question 18

Bob has an experiment when he mixes atom X and Atom Y, he expects the outcome to be 80g, however he only gets 40 grams OUT OF IT

WHAT IS THE PERCENTAGE YIELD?

Answer 18

40/80= 0.5

0.5*100= 50%

Question 19

What is a LIMITING REAGENT

Answer 19

its the reactant that would run out first in a reaction, as it limits the amount of production that could be made

Question 20

How do you find volume in dm^3

Answer 20

number of moles*24 dm^3

Question 21

How is concentration measured

Answer 21

mass (g)/volume(dm^3)

Question 22

What is TITRATION

Answer 22

a titration is an experiment in which you see what Volume of a reactant is needed to completely react with a certain volume of another reactant

Question 23

how are titrations measured

Answer 23

amount of moles/ Concentration (in mol/dm^3)

Question 24

would fractional distilltion or simple distillation be used to separate a miscible layer of liquids

Answer 24

fractional distillation

Question 25

what does ‘concordant’ mean in a titration

Answer 25

similar results of titration outcomes/ similar volumes of titrate needed. this is to identify outliers

Question 26

uses for sulphuric acid

Answer 26

fertilisers and cleaning detergents

Question 27

how can you collect gas in an experiment (2 ways)

Answer 27

using a syringe

using a measuring cylinder upside down in water