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Standard Grade Revision. Units 1 and 2. Q.1 When green copper carbonate is added to hydrochloric acid solution a rapid reaction takes place in which a gas is given off and a blue solution is formed. Give two pieces of information which would prove that a chemical reaction had taken place. - PowerPoint PPT Presentation
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Standard Grade Revision
Units 1 and 2.
Q.1 When green copper carbonate is added to hydrochloric acid solution a rapid reaction takes place in which a gas is given off and a blue solution is formed.
Give two pieces of information which would prove that a chemical reaction had taken place.
Answer:- 1) In the reaction a gas is formed.
2) In the reaction there is a colour change – the
green copper carbonate changes to a blue
solution..Standard Grade Chemistry
Units 1 and 2 Revision
Q2. When silvery magnesium ribbon is burned in air the
magnesium combines with oxygen in the air to form
white magnesium oxide. In the reaction heat and
light energy are given out.
(a) Give two pieces of information that shows that a chemical reaction has taken place.
(b) What word is used to describe a reaction in which energy is given out?
(c) Write a word equation for the reaction.
Answers:-
(a) 1. Colour change (Silver magnesium to white powder). 2. Energy given out.
(b) Exothermic.
(c) Magnesium + Oxygen Magnesium oxideBurning magnesium in air
Q3. Barium chloride and sodium sulphate solutions are both
colourless. When the two solutions are mixed a white solid
called barium sulphate is formed.
(a) Give one piece of information which shows that a chemical
reaction had taken place.
(b) Which of the chemicals mentioned is the precipitate?
Units 1 and 2 Revision
Answers:-
(a) Solid being formed in the reaction when the chemicals
present in the two solutions react together.
(b) The barium sulphate is the precipitate. A precipitate is
an insoluble solid formed when two solutions are mixed.
Mixing solutions of barium chloride
and sodium sulphate
Units 1 and 2 Revision.
Q4. Write the symbol for each of the following elements.
(a) Potassium (b) Phosphorus (c) Sulphur
(d) Sodium (e) Calcium (f) Copper
Answers:-
(a) K (b) P (c) S
(d) Na (e) Ca (f) Cu
Q5. What are the names of the elements whose symbols are
shown below?
(a) Zn (b) O (c) F
(d) He (e) Fe (f) Cr
Answers:-
(a) Zinc (b) Oxygen (c) Fluorine
(d) Helium (e) Iron (f) Chromium
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 1 and 2 Revision.
Q6. Name the elements present in the following compounds.
(a) Lead sulphide (b) Calcium carbide
(c) Copper sulphate (d) Sodium hydrogencarbonate.
Answers:-
(a) Lead and sulphur (b) Calcium and carbon
(c) Copper, sulphur and oxygen (d) Sodium, hydrogen, carbon
and oxygen
Q7. Name the compounds which contain the following
elements.
(a) Oxygen and iron. (b) Barium, oxygen and carbon
(c) Lead, nitrogen and oxygen (d) Chlorine and copper.
Answers:-
(a) Iron oxide (b) Barium carbonate
(c) Lead nitrate (d) Copper chlorideStandard Grade Chemistry
Q8. Use the word box below to answer the following
solute solution solvent dilute concentrated saturated
(a) When sodium chloride is dissolved in water the water is described as being the …………………(b) When sodium chloride is dissolved in water the sodium
chloride is described as being the ………………….(c) When no more sodium chloride will dissolve in water the sodium chloride solution is said to be ……………………(d) A solution which contains a lot of sodium chloride
dissolved in a small volume of water is said to be …………………………
Units 1 and 2 Revision.
Answers:-
(a) solute (b) solvent (c) saturated
(d) concentratedStandard Grade Chemistry
Units 1 and 2 Revision.
Q9.
(a) Identify the two experiments which can be used to investigate the
effect of concentration on the rate of the reaction.
(b) Identify the experiment with the fastest reaction rate.
Answers
(a) C and D. (b) F
Standard Grade Chemistry
Units 1 and 2 Revision.
Q10. Matthew added manganese dioxide to hydrogen peroxide solution, oxygen was produced. Manganese dioxide is a catalyst.
(a) What is the purpose of a catalyst?
(b) What will be the mass of the manganese dioxide at the end
of the reaction?
(c) What would happen to the rate at which oxygen gas is given off
if the temperature was raised to 35oC?
Answers: (a) A catalyst speeds up a reaction.
(b) 0.1 g (A catalyst is not used up in a reaction).
(c) The rate of oxygen gas production will increase.Standard Grade Chemistry
Units 1 and 2 Revision.
Q11. Zinc reacts with dilute sulphuric acid.
Identify the two factor which will speed up the reaction.
A Using a larger volume of acidB Diluting the acid with waterC Using a larger beakerD Heating the acidE Using a catalyst
Answers:- D and E.
Standard Grade Chemistry
Units 1 and 2 Revision.
Complete the following sentences.
1. All chemical reactions involve the formation of one, or more ……………… substances.
2. Everything in the world is made from about
……………. elements.
3. When elements join together they form
…………………………..
4. A mixture is formed when two, or more,
substances come together but do …… react.
new
100
compounds
not
Standard Grade Chemistry
Units 1 and 2 Revision.
Complete the following sentences.
1. ………………. the temperature will speed
up a reaction.
2. Changing from a lump to a powder increases the ………………. ………………. of a solid
and ………….. ………… a reaction.
3. 2 mol/l acid is ……………. concentrated
than 1 mol/l acid. The more concentrated acid reacts more ………………… with
marble chips than the dilute acid.
surface area
speeds up
more
quickly
Increasing
Standard Grade Chemistry
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