Year 7 end of year exam revision test
Q1 You will need to use your Periodic table to answer the following questions [5]
A. Give the symbol for the element found in period 3 group 2. Mg
B. Give the symbol for the element with atomic number 8. O
C. What name is given to the elements found in Group 0? Noble gases
D. Which group of the periodic table is also known as the halogens? Group 7
E. Give the symbol of the element with electron arrangement 2.8.3 Al
Q2
How would you to test for the following gases?
A. Oxygen, relights glowing splint
B. Carbon dioxide Turns limewater cloudy/milky
C. Hydrogen. Squeaky pop with flame
Q3
What is the mass and charge of the following particles:
A. Proton 1 & +1
B. Neutron 1 & 0
C. Electron 0 & -1
Q4
Write down the meaning of
A. exothermic Reaction that gives out heat energy to the surroundings
(solution or air) – temperature goes up.
B. Endothermic Reaction that takes in heat energy from the surroundings
(solution or air) – temperature goes down.
C. precipitation – solid (formed when two solutions react together)
D. an element – A pure substance made form only one type of atom.
Q5
When Atoms react they either lose or gain electrons to achieve a full outer shell of
electrons.
Atoms / elements in groups 1 to 3 lose electrons to form positive atoms (called ions).
Atoms / elements in groups 5 to 7 gain electrons to form negative atoms (called
ions).
The atoms / elements in group 4 and either gain or lose electrons, becoming either +
or – ions.
The information is summarised in the table below.
Charge
on ion
Group
+1
+2
+3
+4/-4
-3
-2
-1
1
2
3
4
5
6
7
The formula of sodium oxide is Na2O
This is because:
Na is in group 1 and forms an ion = +1
O is in group 6 and forms an ion = -2
Use the information from the question to find the formula of the following
compounds.
A. Calcium oxide (Ca Group 2 O Group 6) CaO
B. Magnesium chloride (Mg Group2 Cl group 7) MgCl2
C. Lithium nitride (Li Group 1 N Group 5) Li3N
D. Aluminium oxide (Al Group 3 O Group 6) Al2O3
Groups of atoms can also form ions
For example
Hydroxide (OH) forms the ion OH-1
Nitrate (NO3) forms the ion NO3-1
carbonate (CO3) forms the ion CO22(i)
(ii)
(iii)
What is the formula of sodium hydroxide ( Na Group 1)? NaOH
What is the formula of potassium nitrate ( K Group 1)? KNO3
What is the formula of magnesium nitrate ( Mg Group 2)? Mg(NO3)2
Q6
Na2O has a total of three atoms, two Na and one O.
Workout the total number of atoms in the following compounds.
NaOH (3)
NH4NO3 (9)
Li2CO3 (6)
Mg(NO3)2 (9)
Q7
a) Complete the diagram to show how the electrons are arranged in nitrogen
(atomic number = 7) (2.5)
N
b) How does the electron arrangement tell which group and
period nitrogen is in?
5 electrons in outer shell = Group 5, Two shells = period 2
c) When nitrogen reacts it gains three electrons and forms N -3 ion.
Explain it gains three electrons. Needs three to have a full outer shell of 8
electrons
Explain why it forms a N-3 ion. Electrons are negative, gaining three makes
the atom -3, no longer called an atom but an ion (ion = atom with a charge)
Q8
Complete the table for the acids.
Name
Formula
Hydrochloric
HCl
Sulphuric
H2SO4
Nitric acid
HNO3
Q9 Estimate the pH of the following substances.
A.
B.
C.
D.
E.
F.
concentrated hydrochloric acid, pH 1
citric acid a weak acid, pH 2-6
water pH 7
ammonia a weak alkali pH 8-12
sodium hydroxide a strong alkali pH 14
A substance that turns universal indicator yellow. pH 4-6
Q10
What type of reaction occurs when an acid reacts with an alkali?
Neutralisation
Q11
Which of the following statements is true?
Elements in the periodic table are arranged in order of
A.
B.
C.
D.
Increasing relative atomic mass
Increasing atomic number
Increasing number of neutrons
Increasing number of protons + electrons.
Q12
Use you periodic table to answer the following questions about sodium.
A.
B.
C.
D.
What is the chemical symbol for sodium? Na
How many protons does an atom of sodium have? 11
How many electrons does an atom of sodium have? 11
How many neutrons does an atom of sodium have? Mass – protons = 23-11 =
12
Q13
Complete the word equations for following reactions.
Magnesium + Oxygen  magnesium oxide
Sodium + chlorine  Sodium chloride
calcium + nitrogen  calcium nitride
Q14
Name the following compounds
H2O
Water
KBr
potassium bromide
Al2O3
Aluminium oxide
Ca3N2
calcium nitride
Q15
A student weighs out 2.5g of zinc carbonate into a test tube and then heats it
strongly for 5 minutes. After allowing the test tube to cool the student reweighs it.
When zinc carbonate solid is heated it breaks up into zinc oxide solid and carbon
dioxide gas.
a) What name is given to this type of reaction? Thermal decomposition
b) Complete the equation for the reaction that has occurred.
Zinc carbonate solid  Zinc oxide solid + carbon dioxide gas
c) Circle the correct mass of the test tube and contents after heating?
3.0g
2.5g
2.0g
Explain your choice?
Loses carbon dioxide gas – loses mass.
Q16
What do the following hazard signs mean?
Cancerous/ toxic to
body organs
Toxic/ poisonous
Corrosive to metals
and corrosive to
skin
Skin, eye and
respiratory
irritation - harmful
Q17
Name the following pieces of apparatus
Pestle & mortar
Conical flask
Measuring cylinder
Bunsen Burner
Test tube or boiling tube
Beaker
Test tube or boiling tube holder
Clay pipe triangle
Q18
A student used a thermometer to record the temperature rise for the reaction
between hydrochloric acid and magnesium ribbon. The diagram below shows the
thermometer readings. Write the values recorded by the thermometers.
17.7 oC
22.4oC