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Worksheetsquiz 10 sec 1
Total questions: 20
Worksheet time: 2hrs 40mins
Number of the atoms in 0.5 mol of acetic acid CH3COOH equals …..
Avogadro’s number
Double Avogadro’s number
Four times Avogadro’s number
Eight times Avogadro’s number
What is the mass of 0.25 L (at STP) of the gas (X) whose molar mass = 62.7 g/mol?
0.69 g
0.35 g
0.07 g
0.035 g
What is the equation relating the volume of a gas, 𝑉, to the number of moles of the gas, 𝑛, and its molar volume, 𝑉m?
𝑉=𝑉m/𝑛
𝑉=𝑉mn
𝑉=𝑛Vm
𝑉=𝑛𝑉m
In which of these compounds the mass percentage of carbon is larger?
C2H2
C2H4
C3H8
C4H10
On dissolving table sugar in water with stirring, _______ is (are) formed.
One compound
A mixture
Two compounds
A compound and a mixture
What is the physical state of the solvent in amalgams?
Gas only.
Liquid only
Solid only
Gas, liquid or solid.
Fill in the blank: Aqueous sodium chloride can be considered a …...
strong electrolyte
nonelectrolyte
weak electrolyte
all the following mixtures can the components be distinguished by the naked eye except
Aerosol
Sugar in kerosene
Blood
Cobalt(II) chloride in water
Which of the following substances completely ionises in solution and hence conducts electricity to a great extent?
Ammonium hydroxide
Aqueous sodium chloride
Acetic acid
Pure water
Why is sugar, a polar substance, soluble in water?
Because water molecules form a hydrogen bond with sugar molecules
Because water molecules form a metallic bond with sugar molecules
Because water molecules form a covalent bond with sugar molecules
Because water molecules form an ionic bond with sugar molecules
Which of the following is insoluble in water?
Iodine
Nickel nitrate
Sodium chloride
Potassium hydroxide
After mixing 4 ml of 0.5 mol/L copper (II) sulphate solution with 4 mt of 0.5 mol/L sodium hydroxide solution, and at the end of the reaction ........... remain.
Cu(OH)2(aq) and NaOH(aq)
Cu(OH)2(s), Na2SO4(aq) and CuSO4(aq)
Cu(OH)2(aq), Na2SO4(aq) and CuSO4(aq)
Cu(OH)2(s) and NaOH(aq)
By dissolving 25 mL of oil in an amount of benzene, a solution of 40% percentage concentration (v/v) is obtained. Calculate the volume of benzene used to prepare the solution. Give your answer to one decimal place.
62.5 mL
65.0 mL
87.5 mL
37.5 mL
Which of the following statements best describes the concentration of a solution?
How reactive a solute is with water
The amount of solvent dissolved in a certain volume of solute
The amount of solute dissolved in a certain volume of solution
How quickly a solute dissolves in a solvent
Which of the following is the definition of molarity?
Molarity (M) is the number of moles of a substance per liter of solution
Molariy (M) is the number of mole equivalents of a substance per liter of solution.
Molarity (M) is the number of moles of a substance per milliliter of solution
Molarity (M) is the number of moles of a substance per kilogram of solution.
A student wants to perform an experiment to measure the time of dissolving 2 2 of magnesium completely in 100 mL of hydrochloric acid, what are the required tools for this experiment?
Stopwatch, graduated cylinder, sensitive balance
Graduated cylinder, thermometer, and sensitive balance
Stopwatch, sensitive balance
Stopwatch, graduated cylinder
Phase changes such as boiling and melting, as well reactions that release or absorb energy, are studied in detail by which branch of chemistry?
Organic chemistry
Thermochemistry
Biochemistry
Nuclear chemistry
Which branch of chemistry is most likely to study radioactivity and transformations in the nuclei of atoms?
Nuclear chemistry
Neurochemistry
Photochemistry
Inorganic chemistry
What piece of scientific equipment is used to measure mass?
Beaker
Volumetric pipet
Graduated cylinder
balance
What is the tool used to in preparing potassium hydroxide solution to be used in the determination of the concentration of sulphuric acid
Burette
Beaker
Volumetric flask
Round bottom flask
