standard grade revision units 3 and 4 answer:- (a) lithium q1. the box below shows the names of some...
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Standard Grade RevisionUnits 3 and 4
Answer:-
(a) Lithium
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.
(b) Chlorine (c) Copper
(d) Neon and argon (e) Chlorine and oxygen.
H
Li
Na
K
Rb
Cs
Fr
Be
Mg
Ca
Sr
Ba
Ra
Sc
Y
La
Ti
Zr
Hf
V
Nb
Tl
Cr
Mo
W
Mn
Tc
Rh
Fe
Ru
Os
Co
Rh
Ir
Ni
Pd
Pt
Cu
Ag
Au
Zn
Cd
Hg
B
Al
Ga
In
Tl
C
Si
Ge
Sn
Pb
N
P
As
Sb
Bi
O
S
Se
Te
Po
F
Cl
Br
I
At
Ne
Ar
Kr
Xe
Rn
He
Ce
Th
La
Pr
Pa
Hf
Nd
U
Tl
Pm
Np
W
Sm
Pu
Rh
Eu
Am
Os
Gd
CmRhIr
Tb
Bk
Pt
Dy
Cf
Au
Ho
Es
Hg
Er
Fm
Ga
Tm
Md
Ge
Yb
No
As
Lu
Lr
Se
Use your data booklet.
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 (b) carbon. (c) plutonium
(d) sulphur (e) mercury (f) plutonium
H
Li
Na
K
Rb
Cs
Fr
Be
Mg
Ca
Sr
Ba
Ra
Sc
Y
La
Ti
Zr
Hf
V
Nb
Tl
Cr
Mo
W
Mn
Tc
Rh
Fe
Ru
Os
Co
Rh
Ir
Ni
Pd
Pt
Cu
Ag
Au
Zn
Cd
Hg
B
Al
Ga
In
Tl
C
Si
Ge
Sn
Pb
N
P
As
Sb
Bi
O
S
Se
Te
Po
F
Cl
Br
I
At
Ne
Ar
Kr
Xe
Rn
He
Ce
Th
La
Pr
Pa
Hf
Nd
U
Tl
Pm
Np
W
Sm
Pu
Rh
Eu
Am
Os
Gd
CmRhIr
Tb
Bk
Pt
Dy
Cf
Au
Ho
Es
Hg
Er
Fm
Ga
Tm
Md
Ge
Yb
No
As
Lu
Lr
Se
Use your data booklet.
Standard Grade Chemistry
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?
Units 3 and 4 Revision
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
them reacting with oxygen in the air,
H
Li
Na
K
Rb
Cs
Fr
Be
Mg
Ca
Sr
Ba
Ra
Sc
Y
La
Ti
Zr
Hf
V
Nb
Tl
Cr
Mo
W
Mn
Tc
Rh
Fe
Ru
Os
Co
Rh
Ir
Ni
Pd
Pt
Cu
Ag
Au
Zn
Cd
Hg
B
Al
Ga
In
Tl
C
Si
Ge
Sn
Pb
N
P
As
Sb
Bi
O
S
Se
Te
Po
F
Cl
Br
I
At
Ne
Ar
Kr
Xe
Rn
He
Ce
Th
La
Pr
Pa
Hf
Nd
U
Tl
Pm
Np
W
Sm
Pu
Rh
Eu
Am
Os
Gd
CmRhIr
Tb
Bk
Pt
Dy
Cf
Au
Ho
Es
Hg
Er
Fm
Ga
Tm
Md
Ge
Yb
No
As
Lu
Lr
Se
Use your data booklet.
Q5. The melting point increases.Standard Grade Chemistry
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+.
Q7. An atom of aluminium can be shown as27 Al
13(a) What is the mass number of this atom?(b) What is the atomic number of this atom?(c) How many (i) protons
(ii) neutrons (iii) electrons
are there in this atom?(d) Explain why this atom is neutral.
(a) neutron
(b) electron
(c) proton.
(a) 27
(b) 13
(c) (i) 13
(ii) 14
(iii) 13
(d) Same number of protons (+ ) and electrons (-)Standard Grade Chemistry
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.
Q9. Explain why the elements lithium, sodium and potassium
have similar chemical 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) Magnesium
(b) Nitrogen
(c) Fluorine
These elements have the same number of electrons in their outer energy level – this gives them similar properties.
(a) Atoms with same atomic number and different mass number.
(b) 35Cl isotope is more common.
H
Li
Na
K
Rb
Cs
Fr
Be
Mg
Ca
Sr
Ba
Ra
Sc
Y
La
Ti
Zr
Hf
V
Nb
Tl
Cr
Mo
W
Mn
Tc
Rh
Fe
Ru
Os
Co
Rh
Ir
Ni
Pd
Pt
Cu
Ag
Au
Zn
Cd
Hg
B
Al
Ga
In
Tl
C
Si
Ge
Sn
Pb
N
P
As
Sb
Bi
O
S
Se
Te
Po
F
Cl
Br
I
At
Ne
Ar
Kr
Xe
Rn
He
Ce
Th
La
Pr
Pa
Hf
Nd
U
Tl
Pm
Np
W
Sm
Pu
Rh
Eu
Am
Os
Gd
CmRhIr
Tb
Bk
Pt
Dy
Cf
Au
Ho
Es
Hg
Er
Fm
Ga
Tm
Md
Ge
Yb
No
As
Lu
Lr
Se
Use your data booklet.
Standard Grade Chemistry
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 (ii)
H: N: N
H H H H
..
..Standard Grade Chemistry
Units 3 and 4 Revision.
Q12. Write the formula of the following compounds.
(a) Sulphur trioxide.
(b) Dinitrogen monoxide
(c) Phosphorus pentachloride.
Q13. Write the formula of the following compounds.
(a) Sodium sulphide.
(b) Aluminium oxide.
(c) Silicon oxide.
(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.
SO3
N2O
PCl5
Na2S
Al2O3
SiO2
FeCl3
Magnesium bromide (MgBr2)
H
Li
Na
K
Rb
Cs
Fr
Be
Mg
Ca
Sr
Ba
Ra
Sc
Y
La
Ti
Zr
Hf
V
Nb
Tl
Cr
Mo
W
Mn
Tc
Rh
Fe
Ru
Os
Co
Rh
Ir
Ni
Pd
Pt
Cu
Ag
Au
Zn
Cd
Hg
B
Al
Ga
In
Tl
C
Si
Ge
Sn
Pb
N
P
As
Sb
Bi
O
S
Se
Te
Po
F
Cl
Br
I
At
Ne
Ar
Kr
Xe
Rn
He
Ce
Th
La
Pr
Pa
Hf
Nd
U
Tl
Pm
Np
W
Sm
Pu
Rh
Eu
Am
Os
Gd
CmRhIr
Tb
Bk
Pt
Dy
Cf
Au
Ho
Es
Hg
Er
Fm
Ga
Tm
Md
Ge
Yb
No
As
Lu
Lr
Se
Use your data booklet.
Standard Grade Chemistry
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.
H2 + O2 H2O
Rewrite this as a balanced equation.
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 + 3CO 2Fe + 3CO2
2H2 + O2 2H2O
Standard Grade Chemistry
Units 3 and 4 Revision.
Q17. The box below shows a number of gas elements.
argon hydrogen fluorine
neon nitrogen 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.
Standard Grade Chemistry