WorksheetsProgram Teknik Menjawab Chemistry
Total questions: 17
Worksheet time: 9mins
What is the physical property of bromine in room temperature?
gas
solid
gel
liquid
What is the colour of chlorine in liquid?
brown
light purple
yellow
beige
(a) Zn2+(aq) + 2e- -> Zn(s) -0.76
(b) Cr3+(aq) + 3e- -> Cr(s) -0.74
(c) Fe2+(aq) + 2e- -> Fe(s) -0.41
correct decreasing order of reducing agents is
a>b>c
b>a>c
c>a>b
c>b>a
When a candle is lit hydrocarbons are combusting. An exothermic reaction is occuring. Energy is being _________________ .
absorbed
frozen
destroyed
released
Below are two thermo chemical equations for the neutralization process.
NaOH + HCl -- > NaCl + H2O ; ΔH = -57 kJ mol-1
NaOH + CH3COOH -- > CH3COONa + H2O ; ΔH = -55 kJ mol-1
The value of the heat of neutralization for both processes are different because …..
the ethanoic acid is less soluble in water.
the production of sodium ethanoate salt absorbs heat.
the ethanoic acid produces only a small amount of hydrogen ions.
greater amount of heat is absorbed to ionize the ethanoic acid molecule.
Which of the following statements best define the term ‘salt’?
Salt is formed when metal reacts with an alkali.
Salt contains sodium ions and chloride ions.
Salt is formed from a weak Van der Waals’ forces of attraction.
Salt is formed when the hydrogen ions in an acid is replaced by metal or ammonium ions.
Which of the following is not a use of a salt as a food preservative?
ammonium sulphate, (NH4)2SO4 to preserve fruit jam
common salt, NaCl to prepare salted fish
sodium benzoate, C6H5COONa to preserve sauces
sodium nitrite, NaNO2 to preserve sausages
What are the products if magnesium reacts with hydrochloric acid?
Magnesium chloride + Hydrogen
Magnesium sulfate + Hydrogen
Magnesium oxide + Hydrogen
Magnesium sulfide + Hydrogen
Which of the following can increase the rate of reaction?
(More than 1 option)
Decrease the size of reactants
Increase the temperature
Presence of inhibitors
Increase the concentration of reactants
Increase the pressure
Increase in temperature causes the particles to
slow down
move faster
stay apart from each other
move in the correct order
The following equation shows the reaction between calcium carbonate, CaCO3 and hydrochloric acid, HCl:
CaCO3(aq) + 2HCl(aq) → CaCl2(aq) + CO2 (g) + H2O(l)
Which of the following is the suitable method to determine the rate of reaction?
Change in the temperature of the solution with time
Change in the volume of carbon dioxide gas with time
Change in the mass of water with time
Change in the concentration of hydrochloric acid with time
Diagram 4 shows the graph of volume of carbon dioxide gas against time when 5 g of marble chips is added to
50 cm3 of 0.2 mol dm-3 hydrochloric acid.
At what time the rate of reaction the highest?
t1
t2
t3
t4
The equation represents the reaction between sodium carbonate and hydrochloric acid.
Na2CO3 + 2 HCl → 2 NaCl + H2O + CO2
The mass of the beaker and its contents is plotted against time.
Which graph represents what happens when sodium carbonate reacts with an excess of dilute hydrochloric acid?
Magnesium reacts with acid to produce hydrogen gas, H2.Which solution would give the highest initial rate of reaction?
100 cm3 of 1.0 mol dm-3 of nitric acid, HNO3
100 cm3 of 1.0 mol dm-3 of hydrochloric acid, HCl
100 cm3 of 1.0 mol dm-3 of sulphuric acid, H2SO4
100 cm3 of 1.0 mol dm-3 of ethanoic acid, CH3COOH
