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Past Paper Questions MC Solutions

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Subject

chemistry

Academic year: 2020/2021
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Casula High School

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1 Which separation technique would be best to obtain samples of pure copper sulfate from a solution of copper sulfate?

(A) Evaporation (B) Centrifugation (C) Distillation (D) Filtration

2 Alkali metals become more reactive proceeding down the Group. This is because:

(A) the energy produced in the ionisation of the metal atoms increases. (B) the energy required to ionise the metal atoms increases. (C) the energy produced in the ionisation of the metal atoms decreases. (D) the energy required to ionise the metal atoms decreases.

3 Which of the following statements about bonding between molecules is true?

(A) Only molecules which have H-N, H-O or H-F bonds can produce dipole dipole bonds. (B) All molecules which have polar covalent bonds will produce either dipole dipole or hydrogen bonds. (C) The larger the molecules in a homologous series the stronger the dispersion forces. (D) Non-polar molecules have no intermolecular bonds.

4 0 moles of magnesium nitrate is weighed out and then dissolved in water to an exact volume of 500 mL. Which of the following is correct?

(A) the concentration of nitrate ions is 0 mol L- (B) the concentration of magnesium ions is 0 mol L- (C) the concentration of nitrate ions is 1 mol L- (D) the concentration of magnesium ions is 0 mol L-

5 Water is considered to have an unusually high specific heat capacity. What does this tell you about water?

(A) Compared to most other materials, a given mass of water will experience a larger temperature change per Joule of energy absorbed or released. (B) Compared to most other materials, for a given mass of water, a great deal of energy could be absorbed with only a small change in temperature. (C) Compared to most other materials, for a given body of water, a small amount of energy absorbed will result in a large temperature change. (D) Compared to most other materials, a large mass of water would be required for a 1K temperature drop to cause a large release of energy.

1 6 Which of the following is true about endothermic reactions?

(A) They will always have a negative ΔH.

(B) The energy of the reactants will always be greater than that of the products. (C) There will be a net gain of energy to the chemical system. (D) Energy will be released in the breaking of bonds and absorbed in the formation of bonds.

7 Which of the following best describes the relationship of graphite and diamond?

(A) They are two isotopes of carbon. (B) They are two isomers of carbon. (C) They are two nucleons of carbon. (D) They are two allotropes of carbon.

8 Which of the following species have the same electron configuration?

(A) F, Cl, Br (B) Cl–, Ar, K+ (C) Na, Mg, Al (D) Cu, Zn, Fe

9 Which of the following is a correct statement about molecules?

(A) The formula NaCl represents a molecule of sodium chloride. (B) All covalently bonded substances are made of molecules. (C) Only compounds can be molecular. (D) A molecule is a finite structure composed of two or more covalently bonded atoms.

10 The formula for glucose is C 6 H 12 O 6. Which of the following is true for C 6 H 12 O 6?

(A) It is a molecular formula. (B) It is a structural formula. (C) It is an empirical formula. (D) It is both an empirical and molecular formula.

11 The structure of a metallic lattice can best be described as:

(A) a 3D array of cations held together by a sea of electrons. (B) a 3D array of alternating cations and anions. (C) a 3D array of atoms covalently bonded to each other. (D) a 3D array of dissociated atoms which are free to move around.

2 12 Which of the following substances has the largest molar mass?

(A) lithium sulfate (B) beryllium sulfate (C) sodium sulfate (D) calcium sulfate

22,233 18,

25,397 23,

When the two elements were combined under the right conditions a synthesis reaction occurred. Using the data above, determine the correct formula for the resulting compound.

(A) ZY 2

(B) ZY

(C) Y 3 Z 5

(D) ZY 3

17 Arrange Na, Al, Rb and Sr metals in order of increasing first ionisation energy:

(A) Na, Al, Rb, Sr (B) Sr, Rb, Al, Na (C) Al, Na, Sr, Rb (D) Rb, Sr, Na, Al

18 Which of the following is true for all metal displacement reactions?

(A) Ions of the less reactive metal gain electrons from the atoms of the more reactive metal. (B) Ions of the more reactive metal gain electrons from the atoms of the less reactive metal. (C) Atoms of the more reactive metal gain electrons from the ions of the less reactive metal. (D) Atoms of the less reactive metal gain electrons from the ions of the more reactive metal.

19 2 L of an unknown gas has the same mass as 0 L of bromine gas at the same temperature and pressure. What is the gas?

(A) CO 2

(B) Ne 2 (C) F 2 (D) Ar

4 20 Moving from left to right across Period 3 of the Periodic Table, which of the following does not increase?

(A) The number of electron shells (B) The total number of electrons (C) The number of valence electrons (D) The charge on the nucleus

21 Which of the following elements has the highest electronegativity?

(A) helium (B) francium (C) fluorine (D) nitrogen

22 Which of the following iron-containing minerals has the greatest percentage of iron by mass?

(A) magnetite, Fe 3 O4(s) (B) hematite, Fe 2 O3(s) (C) siderite, FeCO3(s) (D) goethite, FeO(OH)(s)

23 Approximately how many atoms are there in 1 g of water?

(A) 3 × 1022

(B) 1 × 1023

(C) 6 × 1023

(D) 1 × 1024

24 Which of the following substances has the smallest molar mass?

(A) sodium oxide (B) magnesium oxide (C) potassium oxide (D) calcium oxide

5 25 When comparing a more reactive metal with a less reactive metal:

(A) The less reactive metal is more likely to be found as an uncombined naturally occurring element. (B) The more reactive metal is more spontaneous in losing electrons than is the less reactive metal. (C) More energy is required to extract the less reactive metal from one of its compounds. (D) More reactive metals absorb more heat than less reactive metals when they react.

32 Which of the following is the name for FeS?

(A) iron monosulfide (B) iron monosulfate (C) iron(II) sulfide (D) iron(II) sulfate

33 Which of the following methods would best enable you to separate two immiscible liquids?

(A) using a separating funnel (B) using a filter funnel (C) using evaporation (D) using distillation

34 Which compound contains both covalent and ionic bonds?

(A) MgBr 2 (B) CHCl 3 (C) BCl 3 (D) NH 4 NO 3

35 An atom of element Z (not correct symbol) has the electronic configuration 2, 8, 6. Which of the following species is this element most likely to form?

(A) the ion Z2+ (B) the ion Z6+ (C) the compound H 2 Z (D) the compound Z 6 F

7 36 The first four successive ionisation energies (measured in kJ mol-1) for an element are 550, 1064, 4210 and 5500. This element should be placed in the same group as:

(A) lithium (B) beryllium (C) boron (D) carbon

37 Topaz is a mineral with the formula Al 2 SiO 4 (OH) 2. What is the percentage by mass of aluminium in topaz?

(A) 15%

(B) 16%

(C) 30%

(D) 45%

38 A boy was investigating the reactivity of three unknown metals (X, Y and Z) using displacement reactions. He recorded the following balanced chemical equations:

X(NO 3 )2(aq) + Z(s) → X(s) + Z(NO 3 )2(aq)

Z(s) + Y(NO 3 )2(aq) → Y(s) + Z(NO 3 )2(aq)

Y(s) + X(NO 3 )2(aq) → no visible reaction

Which of the following correctly places the three metals in order of increasing reactivity?

(A) Y, X, Z

(B) Z, Y, X

(C) X, Z, Y

(D) Z, X, Y

39 Which of the following best describes the molecular shape of methane?

(A) trigonal planar (B) bent (C) trigonal pyramidal (D) tetrahedral

8 40 In which of the following substances would you expect hydrogen bonding to occur?

I. CH 2 F 2

II. CH 3 COOH

III. C 2 H 5 OH

(A) II only (B) I and III only (C) II and III only (D) I, II and III

41 The specific heat capacity of gold is 0 J g-1 K-1, and the specific heat capacity of copper is 0 J g-1 K-1. Ten gram samples of each metal were heated to 60 °C, and then dropped into separate beakers containing 20 mL of water.

Which of the following statements are correct?

(A) The copper will react with the water, but the gold will not. (B) The copper sample will transfer more heat energy to the water than the gold sample. (C) The water with the gold sample will have has a final temperature three times

greater the ionisation energy. (D) The more difficult it is for a metal to lose an electron, the smaller the ionisation energy.

47 What is the relationship between the potential energy of an electron and its average distance from the nucleus?

(A) The energy of an electron is variable, irrespective of its location. (B) By definition, all electrons have the same amount of energy, irrespective of their location. (C) The greater the average distance of the electron from the nucleus the less its potential energy. (D) The greater the average distance of the electron from the nucleus the greater its potential energy.

10 48 Identify which row below contains the correct information about the boiling and electrolysis of water.

Type of separation

Amount of energy required

Result of Process

(A) Boiling Relatively large amount of energy

New chemical substance formed

(B) Boiling Relatively small amount of energy

No new chemical substance formed

(C) Electrolysis Relatively small amount of energy

New chemical substance formed

(D) Electrolysis Relatively large amount of energy

No new chemical substance formed

49 Which of the following statements about empirical formulae is correct?

(A) They express the simplest ratio of protons to neutrons present in a compound. (B) They provide information about the elements present in a compound but don’t provide information about the number of particles.

(C) They can only be applied to ionic compounds. (D) They show the number of atoms of different elements in a molecule.

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Past Paper Questions MC Solutions

Subject: chemistry

School: Casula High School

Was this document helpful?
1 Which separation technique would be best to obtain samples of pure copper sulfate from
a solution of copper sulfate?
(A) Evaporation
(B) Centrifugation
(C) Distillation
(D) Filtration
2 Alkali metals become more reactive proceeding down the Group. This is because:
(A) the energy produced in the ionisation of the metal atoms increases.
(B) the energy required to ionise the metal atoms increases.
(C) the energy produced in the ionisation of the metal atoms decreases.
(D) the energy required to ionise the metal atoms decreases.
3 Which of the following statements about bonding between molecules is true?
(A) Only molecules which have H-N, H-O or H-F bonds can produce dipole
dipole bonds.
(B) All molecules which have polar covalent bonds will produce either dipole
dipole or hydrogen bonds.
(C) The larger the molecules in a homologous series the stronger the dispersion
forces.
(D) Non-polar molecules have no intermolecular bonds.
4 0.30 moles of magnesium nitrate is weighed out and then dissolved in water to an
exact volume of 500 mL. Which of the following is correct?
(A) the concentration of nitrate ions is 0.30 mol L-1
(B) the concentration of magnesium ions is 0.15 mol L-1
(C) the concentration of nitrate ions is 1.2 mol L-1
(D) the concentration of magnesium ions is 0.30 mol L-1
5 Water is considered to have an unusually high specific heat capacity. What does this tell
you about water?
(A) Compared to most other materials, a given mass of water will experience a
larger temperature change per Joule of energy absorbed or released.
(B) Compared to most other materials, for a given mass of water, a great deal of
energy could be absorbed with only a small change in temperature.
(C) Compared to most other materials, for a given body of water, a small amount of
energy absorbed will result in a large temperature change.
(D) Compared to most other materials, a large mass of water would be required for a
1K temperature drop to cause a large release of energy.
1
6 Which of the following is true about endothermic reactions?
(A) They will always have a negative ΔH.

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