Chemistry 1

Question 1

What is the formula for determining formal charge?

Answer 1

Formal charge = number of valence electrons - number of electrons in bonded atom

Question 2

Why does the solid/liquid line slant to the left for water?

Answer 2

Because ice is less dense than water

Question 3

How many electrons are in the 3rd shell/orbital?

Answer 3

18

Question 4

Does an exothermic or endothermic reaction require more activation energy?

Answer 4

Endothermic

Question 5

Why does adding solute reduce vapour pressure?

Answer 5

Addition of solute decreases the mole fraction of the solvent

Question 6

Does an exothermic of endothermic reaction have more stable products?

Answer 6

Exothermic

Question 7

When does precipitation occur?

Answer 7

When the concentration is above the Ksp

Question 8

What is the trend for ionisation energy in a group?

Answer 8

Ionisation energy decreases down a group

Question 9

How many valence electrons does sodium have?

Answer 9

1

Question 10

How does temperature affect the solubility of a gaseous solute in a liquid solvent?

Answer 10

Increases in temperature decrease the solibility

Question 11

What is the Eo sign for electrolysis reactions?

Answer 11

Negative - non-spontaneous reaction

Question 12

What is the atomic number for Argon?

Answer 12

18

Question 13

What is entropy?

Answer 13

Randomness, more energy. Delta S

Question 14

What does drawing dog structures allow you to understand?

Answer 14

The bonded and lone pair electrons

Question 15

What is the formula for molality?

Answer 15

Mol of solute/kg of solvent

Question 16

What is a cation?

Answer 16

A positively charged ion that has lost an electron

Question 17

What is a base?

Answer 17

Proton receiver

Question 18

What type of bond is sp2?

Answer 18

Double bond

Question 19

How many valence electrons does silicon have?

Answer 19

4

Question 20

What is the specific heat of a substance?

Answer 20

The amount of heat needed to raise 1kg of the substance by 1 degree

Question 21

What is pKa?

Answer 21

pKa = -logKa

Question 22

What is the relationship between Ka and acidity?

Answer 22

Increased Ka = increased acidity

Question 23

What is pH?

Answer 23

pH = -log [H]

Question 24

What direction does the solid/liquid line usually go in a phase diagram?

Answer 24

Slants to the right

Question 25

What is a valence electron?

Answer 25

Electrons that are in the outermost orbital

Question 26

What is oxidation?

Answer 26

The loss of electrons

Question 27

What is a structural isomer?

Answer 27

Same number of type of elements, different bonds

Question 28

What is an element?

Answer 28

The simplest type of substance with unique physical and chemical properties

Question 29

Explain the concept of the Mole

Answer 29

A way of counting atoms/molecules by weighing them

Question 30

What happens to the oxidising agent?

Answer 30

It is reduced

Question 31

What do you need to do when reversing the direction of a reaction in a potential table?

Answer 31

Reverse the sign

Question 32

What is Ka?

Answer 32

Equilibrium constant Ka = [concentration of products]^x/[concentration of reactants]^y X and y are stoichiometry number

Question 33

What is an ion?

Answer 33

Atom/molecule/compound with a net charge due to the loss of gain of an electron

Question 34

What is structural formula?

Answer 34

The actual number of atoms, their arrangement in space and the bonds between them

Question 35

What is an atom?

Answer 35

The smallest particle of an element that retains it’s chemical properties

Question 36

What is the atomic number for calcium?

Answer 36

20

Question 37

What is the atomic number for carbon?

Answer 37

6

Question 38

How many valence electrons does oxygen have?

Answer 38

6

Question 39

What is the atomic number for potassium?

Answer 39

19