CAPE Chemistry 2014 U1 P1

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CAPE Chemistry U1 P1

1.

Ilem ? refers to the following graph which shows the log of successive ionization energies for ten electrons of an element, P.

Which of the following factors increases the first ionization energY of an dtom?

(A) (B) (C) (D)

Greater nuclear charge Larger atomic radius Larger number ofvalence electrons

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Increased screening bY inner

E+

q)

E5 6l

electrons

N

EJ h0t

:l

2 3 4,5

6 7 8 9

l0

Number of electrons lost Element P is MOST likelY

(A) (B) (C) (D)

chlorine magnesium neon

sodium

Item 3 refers to the following mass spectrum of chlorine gas'

q)

ql

q)

c)

30 35 40 45 50 55 60 65 70 7s

E0

mJe

3.

35Cl* ion, which of the following ions repres#tthe peaks at Q and T at P represents the respectively?

If the peak

(A) (B) (C) (D)

37Cl* and 37Cl* and

(3?Cl- 37Cl)+ (tt cl- 35 cl)*

37Cl* and (3scl- 3scl)+ 37Cl* and (35C1- 37Cl)+

-3Item 4 refers to the following sketch which shows the variation of the boiling points of the hydrides of Group V.

6.

The bond angles in the PH, molecule are the same as that of NClr. Its shape would BEST be described

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c

as

(A) (B)

bipyramidal pyramidal

(c)

tetrahedral

(D)

trigonal

00

7.

NHg PHg AsH3 SbH3 Hydrides 4.

Which of the following statements is true and 5 dm3 ofoxygen at 0 oC and l0l kPa?

of5 dm3ofhydrogen

Ammonia has the highest boiling point

They react to produce 5 dm3 of

(A)

because

water.

(B)

They react completely with

(c)

other. They possess the same amount

(D)

kinetic energy. They contain the same number of

N-H bond is the shortest and

(A)

the

(B)

strongest there are more van der Waals forces between NH, molecules

(c)

there is hydrogen bonding between

(D)

NH, molecules the eletronegativity of nitrogen

each

of

molecules.

is

The following equation represents the reaction of magnesium with hydrochloric

much higher than that of the other elements in the group

acid. J.

Mg + 2H. -.+ Mg2*

Which of the following features describes

* H,

potassium bromide?

The molar volume of a gas at rtp is 24 dm3.

(A)

A

network

of

covalentlv bonded The volume of gas produced at rtp when 1.2 g of Mg reacts with hydrochloric acid is

atoms

(el (c)

(D)

Asubstancewhich boilsat59 oC and decomposes at high temperatures A solid with a very high molar enthalpy of vaporization which does rrot conduct electriciw when in a liquid state A non-conducting solid which melts

(A) (B) (C) (D)

L2 dml 2.4 dm3 12.0 dm3

24.0 dm3

to form a liquid that conducts electricity

9.

The simplest formula for a compound that contains 50% S and 50o/o O by mass is

(A)

(B) (c) (D)

n?l l?nln/aADtr

?nl/

.

so So, S,o SrOo

GO ON TO THE NEXT PAGE

-4-

10.

When 86 g of the ionic salt,

CaSOo.xHrO, 12. In which of the following chemical

heated so that all of its water of crystallization is driven off and 68.0 g - of Caso. remain, the value of x is

is

reactions is sulfur reduced?

(A) 1 (B) 2 (C) 3 (D) 4 11.

Deviations from ideal gas behaviour generally occur under conditions

(A) (B) (C) (D)

14.

of

13.

low pressure and low temperature low pressure and high temperature high pressure and low temperature high pressure and high

temperature

(A)

S

(B)

2SO, +

(C)

SO, + HrO

1D)

2HrSoo+ cu

+ Oz

-

SOz

Or*

2SO, H2So4

*

cuSoo a Soz

+

2Hzo

Which of the following gases is MOST likely to behave like an ideal gas?

(A) (B) (C) (D)

Ammonia Helium Methane

Oxygen

The standard enthalpy changes for two reactions are as follows: 2Fe(s)

? +r

Or(C)

2

C(s)

+

I

1

O"(g)

-

FerOr(s),

AH* = -822

-- CO(B), AII* :

kJ mol-'

-110 kJ mol-'

L

What is the standard enthalpy change, in kJ, for the reaction Fe,O, (s)+ 3C(s) -+ 2Fe(s)

+

3CO(g)

? I

(A) (B) (c) (D)

-e32

-7r2

4e2

+492

-\t

GO ON TO TFItr NItr\'T D^^tr

Which of the following starements may be true about the kinetic theory of an ideal gas?

15.

L IL

18.

Attractive forces are strong between molecules.

(A)

Nr(e) + rHr(s)

Average kinetic energy of the

(B)

SOr(e)

(C)

2cHClFr(g)a-" C,Fo(g; + 2HCl(g)

(D)

CH4G)

molecules is proportional to the absolute temperature. Volume of molecules is negligible

III.

compared to that ofthe container.

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

19.

t==i

zNH,(e)

+ Or(B);:::izSO,(e)

+ H,Q(g);=:

CO(g)

+

3H,(g)

Which of the following statements about dynamic equilibrium is NOT true?

(A) The forward reaction proceeds

The activation energy of a reaction

16.

In which of the following reactions would Ko have units of atm-2?

at the same rate as the reverse

(A) (B) (C) (D)

is unaffected by a catalyst is an energy barrier to the reaction is affected by temperatures reduces the speed of the reactant molecules

(B)

IAI

IBI

Rate of reaction

(mol dm-r)

(moldm'3)

(moldm'3 s'r;

I

0.10

0.10

0.0032

2

0.

r0

0.20

0.0032

J

0.20

0.20

0.0064

and products are throughout the

(C)

Item 17 refers to the table which shows the rate results for the reaction A + B + C Experiment

reaction.

The concentrations of the reactants

(D)

constant the course

of

reaction.

Dynamic equilibrium can only be achieved in a sYstem where no materials are added

or

reactions continue

to take

removed. aPParent change forward and reverse

There is no but both

Place

at equal rates.

20.

The value of K. for the equilibrium shown below is 860 at25oC.

tt,(e)+lr(e)F2HI(g) L7

.

What is the OVERALLorder ofthe reaction?

(A) (B)

Zero First

(c)

Second

(D)

Third

What is the value of K" at 25 'C for the following equi libri um?

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nr