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Chemistry Revision

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Quiz on Chemistry Revision, created by Becky S on 25/05/2015.
Becky S
Quiz by Becky S, updated more than 1 year ago
Becky S
Created by Becky S over 9 years ago
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Resource summary

Question 1

Question
Crude oil is a mixture of hydrocarbons.
Image:
ed620f06-bcfe-408f-985a-f7ca1274fdf1 (image/jpg)
Answer
  • True
  • False

Question 2

Question
What is the general formula for the Alkanes?
Answer
  • Cn Hn+2
  • Cn H2n+2
  • Cn+2 Hn

Question 3

Question
What are isomers?
Answer
  • Compounds that have the same formula but different bonding.
  • Elements with the same number of protons but different numbers of neutrons.
  • Compounds containing hydrogen and carbon.

Question 4

Question
The high temperatures in a fractionating column are at the top.
Answer
  • True
  • False

Question 5

Question
In fractional distillation of crud oil, what are the characteristics of the small molecules? Tick 3 boxes.
Answer
  • Have low boiling point
  • runny
  • viscous
  • light in colour
  • hard to light

Question 6

Question
Name the fraction that does not evaporate during fractional distillation.
Answer
  • Bitumen
  • Gasoline
  • Refinery gases

Question 7

Question
Name the fraction that does not condense in fractional distillation.
Answer
  • refinery gases
  • bitumen
  • lubricating oil

Question 8

Question
What are the products of complete combustion?
Answer
  • Water
  • Oxygen
  • Carbon dioxide
  • Methane
  • Carbon monoxide

Question 9

Question
What are the products of incomplete combustion?
Answer
  • carbon monoxide
  • water
  • carbon dioxide
  • oxygen
  • methane

Question 10

Question
What is the definition on an isotope?
Answer
  • Atoms with the same number of protons but a different number of neutrons
  • Atoms with the same number of protons but a different number of electrons
  • Atoms with the same number of neutrons but a different number of protons

Question 11

Question
All of the elements in a period have the same number of electron shells
Answer
  • True
  • False

Question 12

Question
Reduction involves loss of electrons
Answer
  • True
  • False

Question 13

Question
Ionic bonding is between metals and non metals.
Answer
  • True
  • False

Question 14

Question
Positive ions and negative ions have weak electrostatic forces of attraction.
Answer
  • True
  • False

Question 15

Question
Non metals gain electrons to form negative ions called...
Answer
  • anions
  • cations

Question 16

Question
Ionic bonding is a strong electrostatic attraction between oppositely charged ions.
Answer
  • True
  • False

Question 17

Question
Ionic compounds have high melting and boiling points because of...
Answer
  • Weak electrostatic forces between oppositely charged ions
  • Weak forces of attraction between the molecules
  • Strong electrostatic forces between oppositely charged ions

Question 18

Question
What are the properties of ionic structures?
Answer
  • High melting points
  • Low boiling points
  • Conduct electricity when molten/dissolved in water
  • Crystalline solids

Question 19

Question
What is an electrolyte?
Answer
  • A substance which does not conduct electricity when molten or when dissolved in water, but does conduct electricity when solid .
  • A substance which does not conduct electricity when solid, but does conduct electricity when molten or when dissolved in water.
  • A substance which only conducts electricity when in gas.

Question 20

Question
When a metal atom becomes an ion it loses electrons.
Answer
  • True
  • False

Question 21

Question
Covalent bonding takes place between...
Answer
  • non metals only
  • metals only
  • metals and non metals

Question 22

Question
By sharing electrons, what are atoms trying to do?
Answer
  • To attain noble gas structure
  • To create compounds
  • To create strong bonds

Question 23

Question
In covalent bonding, the shared electrons are attracted by both nuclei, and this attraction forms the covalent bond.
Answer
  • True
  • False

Question 24

Question
Atoms bonded by covalent bonding form...
Answer
  • Molecules
  • Compounds
  • ions

Question 25

Question
The formation of a covalent bond is by the sharing of a pair of electrons between two atoms.
Answer
  • True
  • False

Question 26

Question
Covalent bonding is...
Answer
  • A strong attraction between the bonding pair of electrons and the nuclei of the atoms in the bond.
  • A weak attraction between the bonding pair of electrons and the nuclei of the atoms in the bond.
  • A strong electrostatic force between the bonding pair of electrons and the nuclei of the atoms in the bond.

Question 27

Question
What are the properties of molecular covalent species?
Answer
  • Low melting point
  • High boiling point
  • Usually solids
  • Usually gases or liquids
  • very poor conductors of electricity

Question 28

Question
Why do substances with simple molecular structures have low melting and boiling points?
Answer
  • They have weak bonds between atoms which are easy to overcome.
  • They have weak forces of attraction between molecules which require little energy to overcome.

Question 29

Question
Methane has a high boiling point because there are weak forces between the molecules
Answer
  • True
  • False

Question 30

Question
Why is hydrogen a gas at room temperature?
Answer
  • It has a low boiling point because it has simple molecular bonds are weak and require little energy to overcome
  • It has weak forces of attraction between molecules which require little energy to overcome.

Question 31

Question
Why does a substance like Magnesium Chloride have a high melting point.
Answer
  • It has strong electrostatic forces of attraction between ions.
  • It has strong bonds between molecules which require little energy to overcome.
  • It has strong forces of attraction between molecules which require little energy to overcome.

Question 32

Question
What are the properties of diamond - a giant covalent structure?
Image:
3fad43f9-02f5-4c4b-8b21-68c34875965d.PNG (image/PNG)
Answer
  • made from only carbon atoms
  • it is soluble in water
  • it has a low melting point
  • each atom forms four strong covalent bonds with its neighbours
  • it does not conduct electricity in any state
  • atoms form a rigid 3D structure
  • it is the softest material in the world

Question 33

Question
Why does diamond have a high melting point?
Answer
  • It has many weak covalent bonds.
  • It has strong forces of attraction between molecules.
  • It has many strong covalent bonds which need to be broken - this requires huge amounts of energy.

Question 34

Question
What are the properties of graphite?
Image:
1d622069-4cfc-4414-8b2e-455cf9825c36.PNG (image/PNG)
Answer
  • carbon atoms form 3 covalent bonds with other carbon atoms
  • electrons hold layers together by a strong force
  • the free electron from each carbon atom is found in gaps between the layers
  • the layers can slide over each other easily
  • does not conduct electricity
  • layers of hexagons
  • in pencils
  • soluble in water

Question 35

Question
Allotropes are different forms of the same element, in the same physical state.
Answer
  • True
  • False

Question 36

Question
What are the properties of sand and quartz, silicon dioxide?
Answer
  • giant ionic structure
  • high melting point
  • tetrahedral structure
  • soft
  • insoluble in water

Question 37

Question
Why is it possible to use graphite to lubricate machines?
Answer
  • It is a liquid at room temperature so can help machines to slide.
  • Its structure consists of layers that slide over one another easily as they are held by a weak force
  • It contains a special substance which helps to lubricate the machines

Question 38

Question
Why can graphite conduct electricity?
Answer
  • It contains delocalised electrons (free electrons) which can move through graphite and carry charge.
  • It contains metal which is a good conductor of electricity.
  • It contains allotropes which carry charge from place to place through graphite.

Question 39

Question
What are the properties of metals?
Answer
  • shiny
  • bad conductors of heat and electricity
  • high melting and boiling points
  • ductile
  • strong
  • malleable

Question 40

Question
What is metallic bonding?
Answer
  • the chemical bond of two metals, creating a metallic compound
  • the electrostatic attraction between the positive metal ion and delocalised electrons
  • the strong force of attraction between two oppositely charged metal ions

Question 41

Question
Metal conducts electricity because the electrons are not free to move.
Answer
  • True
  • False

Question 42

Question
Fill the gaps: As you go 1)_________ the group 1 alkali metals, the atomic radius gets 2)___________ due to an extra filled electron shell.
Answer
  • 1) Down
  • 1) Up
  • 2) Bigger
  • 2) Smaller

Question 43

Question
In group 1 metals, the outer electron is less and less strongly attracted by the positive nucleus because it is further from the nucleus and is also shielded by the extra full electron shell of negative charge.
Answer
  • True
  • False

Question 44

Question
Fill the gaps: As you go down group 1 the elements become 1)________ reactive because it is easier to lose the electron from the outer shell and form a(n) 2)________
Answer
  • 1) more
  • 1) less
  • 2) anion
  • 2) cation

Question 45

Question
As you go ________ the group 7 halogens, the atomic radius gets bigger due to an extra filled electron shell.
Answer
  • Down
  • Up

Question 46

Question
As you go down the group, why do outer electrons become less and less strongly attracted by the positive nucleus?
Answer
  • The outer electrons are further from the nucleus and are shielded by the extra full electron shell of negative charge.
  • There are too many other electrons which are attracted to the positive nucleus.
  • The outer electrons are shielded by an extra full electron shell of positive charge.

Question 47

Question
Why do the elements become less reactive as you down Group 7?
Answer
  • dogs can fly
  • It is harder to attract an 8th outer electron, so it cannot fill its outer shell, so it cannot form a bond, so it is less reactive.

Question 48

Question
What are the properties of group 1 metals?
Answer
  • alkali
  • low melting points
  • hard
  • most reactive group
  • blue compounds
  • low densities
  • soluble in water

Question 49

Question
Group 1 metals react vigorously with water to produce an alkaline metal hydroxide and hydrogen gas. Which of these best describes the reaction of potassium with water?
Answer
  • Floats on the surface, gently fizzing and giving off hydrogen.
  • It gets so hot it melts itself when it reacts. Fizzes on surface rapidly.
  • Gets so hot that it lights the hydrogen gas given off. Burns with a lilac flame.

Question 50

Question
Click the correct statements. At room temperature...
Answer
  • Fluorine is a pale yellow gas
  • Chlorine is a blue gas
  • Bromine is a brown/red dense liquid
  • Iodine is a grey solid
  • Astatine is a white sold

Question 51

Question
In halogen displacement reactions, the more reactive halogen prefers to be in the compound.
Answer
  • True
  • False

Question 52

Question
Group 7 elements react vigorously with group 1 elements like sodium and potassium. When they do react, what is formed?
Answer
  • A metal compound
  • A metal halide
  • A metal halogen

Question 53

Question
When halogens react they GAIN electrons, turning into halides. (reduction)
Answer
  • True
  • False

Question 54

Question
Halides GAIN electrons when they become halogens. (oxidation)
Answer
  • True
  • False

Question 55

Question
Select the correct way of expressing the reduction of Bromine (halogen) to Bromide (halide).
Answer
  • Br2 + 2e- → 2Br-
  • Br2 → 2Br- + 2e-
  • Br2 - 2e- → 2Br-

Question 56

Question
Hydrogen Chloride dissociates in water (polar solvent) to form separate ions: H+ and Cl-. The H+ has acidic properties in water, turning...
Answer
  • Blue litmus paper blue
  • Blue litmus paper red
  • Red litmus paper blue

Question 57

Question
When Hyrdrogen Chloride gas is dissolved in Methyl-benzene, why does the blue litmus paper stay blue?
Answer
  • Methyl-benzene is a polar solvent
  • The HCl does not dissolve properly
  • Methyl-benzene is a non-polar solvent

Question 58

Question
Select the correct order of the reactivity series.
Answer
  • Potassium, Sodium, Lithium, Calcium, Magnesium, Aluminium, Silver, Gold, Platinum, Zinc, Iron, Lead, Copper
  • Potassium, Sodium, Lithium, Calcium, Magnesium, Aluminium, Zinc, Iron, Lead, Copper, Silver, Gold, Platinum
  • Potassium, Magnesium, Aluminium, Sodium, Lithium, Calcium, Zinc, Iron, Lead, Copper, Platinum, Silver, Gold,
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