Transcript Units 3 and 4 Revision

Standard
Grade
Topics 3 &4
Standard Grade Revision
Units 3 and 4
Q1. The box below shows the names of some elements.
neon.
lithium chlorine
oxygen
copper argon
(a) Identify the alkali metal.
(b) Identify the halogen.
(c) Identify the element with the highest melting point.
(d) Identify the two very unreactive elements.
(e) Identify the two elements which exist as diatomic molecules.
Answer:Use your data booklet.
(a) Lithium
(b) Chlorine
(d) Neon and argon
(c) Copper
(e) Chlorine and oxygen.
Units 3 and 4 Revision
Q2. The box below shows the names of some elements.
sulphur
mercury
carbon
plutonium
bromine
sodium
Identify the element which
(a) is a liquid non-metal at room temperature.
(b) is in group 4 of the Periodic table.
(c) is radioactive.
(d) has an electron arrangement of 2,8,6
(e) is a liquid metal at room temperature.
(f) is man-made.
Answers:- (a) bromine
(d) sulphur
Use your data booklet.
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(b) carbon.
(e) mercury
(c) plutonium
(f) plutonium
Units 3 and 4 Revision
Q3. Identify the element in group 1 that produces a red flame colour.
Q4. Explain why the metal elements in group 1 are
(a) called the alkali metals.
(b) stored under oil.
Q5. What happens to the melting point of the elements in group 7
(the halogens) as you go the group?
Answers:- Q3. Lithium.
Q4. (a) The elements in group 1 react with water to form an
alkaline solution.
(b) The elements in group 1 are stored under oil to stop
Use your data booklet.
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them reacting with oxygen in the air,
Q5. The melting point increases.
Units 3 and 4 Revision.
Q6. Which of the sub-atomic particles in an atom is being
described?
(a) Mass of 1 amu and a charge of 0.
(b) Mass of almost zero and a charge of 1-.
(c) Mass of 1 amu and a charge of 1+.
(a) neutron
(b) electron
(c) proton.
Q7. An atom of aluminium can be shown as
27
Al
13
(a) 27
(a) What is the mass number of this atom?
(b) 13
(b) What is the atomic number of this atom?
(c) (i) 13
(c) How many (i) protons
(ii) neutrons
(ii) 14
(iii) electrons
(iii) 13
are there in this atom?
(d) Same number of protons (+ ) and
(d) Explain why this atom is neutral.
electrons (-)
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Units 3 and 4 Revision.
Q8. Identify the element
(a) with an atomic number of 12.
(b) with an electron arrangement of 2,5
(c) which has 9 electrons in its atoms.
(a) Magnesium
(b) Nitrogen
(c) Fluorine
Q9. Explain why the elements lithium, sodium and potassium
have similar chemical properties.
These elements have the same number of electrons in their
outer energy level – this gives them similar properties.
Q10. Chlorine atoms exists as two different isotopes 35Cl and
37Cl.
The relative atomic mass of chlorine is 35.5
(a) What is meant by the term ‘isotopes’?
(b) Which of the two isotopes is there more of in chlorine?
(a)
Use your data booklet.
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Atoms with same atomic number and different mass
number.
(b) 35Cl isotope is more common.
Units 3 and 4 Revision.
Q12. Write the formula of the following compounds.
SO3
(a) Sulphur trioxide.
(b) Dinitrogen monoxide
(c) Phosphorus pentachloride.
N2O
PCl5
Q13. Write the formula of the following compounds.
Na2S
(a) Sodium sulphide.
Al2O3
(b) Aluminium oxide.
SiO2
(c) Silicon oxide.
FeCl3
(d) Iron(III) chloride.
Q14. The box below gives the names of some compounds.
magnesium bromide
sodium bromide
lithium hydroxide
sodium iodide
potassium sulphate
lithium chloride
Identify the compound with the formula XY2 where X is a metal.
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Magnesium bromide (MgBr2)
Units 3 and 4 Revision.
Q15. Hydrogen reacts with oxygen to form water.
This reaction is shown by the following equation which is not
balanced.
H 2 + O2  H 2 O
Rewrite this as a balanced equation.
2H2 +
O2 
2H2O
Q16. Iron(III) oxide reacts with carbon monoxide to form
iron and carbon dioxide.
This reaction is shown by the following equation
which is not balanced.
Fe2 O3 + CO  Fe + CO2
Rewrite this as a balanced equation.
Fe2 O3 +
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3CO

2Fe
+ 3CO2
Units 3 and 4 Revision.
Q17. The box below shows a number of gas elements.
argon
neon
hydrogen
nitrogen
fluorine
oxygen
(a) Identify the gas which contains diatomic molecules bonded together by a
double covalent bond.
(b) Identify the two gas which contains single atoms (monatomic)
(a) Oxygen.
(b) Argon and neon.
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Q11. In a hydrogen molecule the atoms share two electrons in a
covalent bond.
(a) Explain how the covalent bond holds the two hydrogen atoms together.
(b) The hydrogen molecule can be represented more simply as
(i)
Showing all outer electrons, draw a similar diagram to represent a
molecule of ammonia , NH3.
(ii) Draw another diagram to show the shape of an ammonia molecule.
(a) The negatively charged electrons in the bond are attracted to the
positively charged protons in the nuclei of the hydrogen atoms.
(b) (i) H..
H: N:
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(ii)
..
N
H
H H H