Groups Rates And Energy Changes

Question 1

What are group 0

Answer 1

Noble gases

Question 2

Why are group 0 inert

Answer 2

They all have a full outer shell

Question 3

What happens as you go down group 0

Answer 3

The b.p, m.p and density increase

Question 4

What are the boiling points of group 0

Answer 4

Lower than room temp

Question 5

What are some properties of noble gases

Answer 5

Colourless, very low b.p and m.p, Poor conductors of heat and electricity, all exists as single atoms because dont form bonds easily with other atoms

Question 6

Uses of krypton

Answer 6

Photography lighting

Question 7

Uses of argon

Answer 7

Added to the space above the wine in wine barrels

Question 8

Uses of helium

Answer 8

Used in weather balloons and airships

Question 9

Neon uses

Answer 9

Illuminated signs

Question 10

What are group 1

Answer 10

Alkali metals

Question 11

How many electrons do alkali metals have in their outer shell

Answer 11

1

Question 12

What happens as you go down group 1

Answer 12

The reactivity increases

Question 13

Why does the reactivity of group 1 increase as u go down it

Answer 13

As we move down the group, the outer electron is less attracted to the nucleus and easier to lose

Question 14

Example of a reaction of an alkali metal with O2

Answer 14

4Li + O(2) — 2Li(2)O

Question 15

Example of reaction of group 1 with chlorine

Answer 15

2Li + Cl(2) — 2LiCl

Question 16

Example of reaction of group 1 metal with water

Answer 16

2Li + 2H(2)O — 2LiOH + H(2)

Question 17

What are group 7

Answer 17

Halogens

Question 18

What are halogens

Answer 18

Non metals

Question 19

What happens as u go down group 7

Answer 19

Melting and boiling points increase

Question 20

How many electrons do halogens have in their outer shell

Answer 20

7

Question 21

What happens when group 7 react with other non metals

Answer 21

They form a covalent bond

Question 22

What hapoens when group 7 react with metal atoms

Answer 22

Form an ionic compound

Question 23

What happens to the group 7 atom when it reacts with a metal

Answer 23

The group 7 element gains one electron and forms a -1 ion

Question 24

Definition for rate of reaction

Answer 24

The speed at which reactants are turned into products

Question 25

How can you control rate of reaction

Answer 25

Altering the concentration of solutions and the size of the pieces of solid reactant

Question 26

What is activation energy

Answer 26

The minimum amount of energy needed for a reaction to occur

Question 27

What are enzymes

Answer 27

Large complex protein molecules

Question 28

What does an enzyme have

Answer 28

Active site

Question 29

What are substrates

Answer 29

The reactant moleucles

Question 30

What is an exothermic reaction

Answer 30

Energy is released

Question 31

Endothermic reaction

Answer 31

Energy is needed

Question 32

What is a neutralisation reaction

Answer 32

Reaction between acid and base, exothermic

Question 33

What is a displacement reaction

Answer 33

Reaction between mental and a compound of a less reactive metal or between a halogen and less reactive compound of a halogen

Question 34

How to calculate rate of reaction

Answer 34

Amount of reactant used or amount of product formed / time

Question 35

What are the 3 ways to measure rate of reaction

Answer 35

Precipitation, change in mass, the volume of gas given off - gas syringe

Question 36

What can u use to measure how surface area affects rate

Answer 36

Marble chips and hydrochloric acid

Question 37

What is a precipitate

Answer 37

An insoluble solid in water

Question 38

What does a steeper gradient show

Answer 38

Faster rate of reaction

Question 39

What increases rats of reaction

Answer 39

Increasing temp

Question 40

What is collision theory

Answer 40

Particles must collide with enough energy to react

Question 41

What does rate of reaction depend on

Answer 41

Collision frequency, energy transferred during collision

Question 42

What 3 things increases rate of reaction

Answer 42

Increasing temp, increasing concentration/pressure, smaller surface area/smaller solid particles

Question 43

Why does increasing temperature increase rate of reaction

Answer 43

Makes particles faster, more collisions also increases energy of collisions - more successful collisions

Question 44

Why does increasing pressure or concentration increase ror

Answer 44

If solution is concentrated there are more particles, increasing pressure makes particles more crowded - more frequent collisons

Question 45

Why does smalled surface area/smaller solid particles increase ror

Answer 45

Higher rate increases surface area : volume ratio, particles have more area to work on collision frequency

Question 46

How do catalysts work

Answer 46

They decrease the activation energy

Question 47

What do reaction profiles show

Answer 47

Energy levels of products and reactants

Question 48

What do catalysts do

Answer 48

Increase ror but never chemically change or get used up

Question 49

Mass of proton

Answer 49

1

Question 50

Mass of neutron

Answer 50

1

Question 51

Mass of electron

Answer 51

0.0005

Question 52

Charge of proton

Answer 52

+1

Question 53

Charge of neutron

Answer 53

0

Question 54

Charge of electron

Answer 54

-1

Question 55

Properties of alkali metals

Answer 55

Soft, low melting points

Question 56

What colour and physical state is chlorine at room temp

Answer 56

Poisonous green gas

Question 57

What colour and physical state is iodine at room temp

Answer 57

Dark grey crystalline solid which gives off a purple vapour when heated

Question 58

What colour and physical state is bromine at room temp

Answer 58

Poisonous red-brown liquid which gives off an orange vapour at room temp

Question 59

What happens to the physical properties of halogens as you go down the group

Answer 59

The melting point increases and the halogens get darker

Question 60

What do halogens form when they react with other metals

Answer 60

Salts called metal halides

Question 61

What do halogens form when they react with hydrogen

Answer 61

Hydrogen halides which are soluble (dissolve in water) to form acidic solutions

Question 62

What happens to the reactivity when u go down group 7

Answer 62

Reactivity decreases

Question 63

What happens in a halogen displacement reaction

Answer 63

The halogens gain electrons (reduction) and the halide ions lose electrons (oxidation)

Question 64

What is bond breaking

Answer 64

Endothermic

Question 65

What is bind making

Answer 65

Exothermic