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Elite Science-Chemistry online competition round 3

Total questions: 100

Worksheet time: 2hrs 35mins

Name
Class
Date
1.

Atoms of elements that are in the same group have the same number of

a)

protons.

b)

neutrons.

c)

valence electrons.

d)

protons and neutrons.

2.

Which of the following is a property of group 18 elements?

a)

malleable

b)

brittleness

c)

high electrical conductivity

d)

unlikely to react with other elements

3.

Alkali metals are extremely reactive because they

a)

have every small atomic masses.

b)

are not solid at room temperature.

c)

have one valence electron that is easily removed to form a positive ion.

d)

have two valence electrons that form compounds with calcium and magnesium.

4.

The table above lists some information about certain elements in group 17. Which statement describes what happens to these elements as atomic number increases?

a)

Both melting point and boiling point decrease.

b)

Melting point increases and boiling point decreases.

c)

Melting point decreases and boiling point increases.

d)

Both melting point and boiling point increase.

5.

Look at the periodic table. Which list of elements forms a group on the periodic table?

a)

Li, Be, B, C, N, O, F, and Ne

b)

He, Ne, Ar, Kr, Xe, and Rn

c)

B, Si, As, Te, and At

d)

Sc, Ti, V, Cr, Mn, Fe, Co, Cu, Ni, and Zd

6.

The _________________ are a small group of elements that have both metallic and nonmetallic properties.

a)

Oxygen Group

b)

Nitrogen Group

c)

Metalloids

d)

Halogens

7.
What is the FAMILY name for GROUP 2 elements? 
a)
Alkali Metals 
b)
Alkali Earth Metals 
c)
Transition Metals 
d)
Kardashians
8.
Which element UNDER ATOMIC NUMBER 50 is artificially made? 
a)
Bromine 
b)
Tin
c)
Hydrogen 
d)
Technetium
9.

Which of the following pairs shows the LARGEST atomic size element FIRST?

a)

Ge, Ni

b)

Si, Ar

c)

Rb, I

d)

Hg, Ba

10.

Where in the Periodic Table is the metallic character of the elements greatest?

a)

A

b)

B

c)

C

d)

D

11.
a)

A

b)

B

c)

C

d)

D

12.
a)

A

b)

B

c)

C

d)

D

13.
a)

A

b)

B

c)

C

d)

D

14.
a)

A

b)

B

c)

C

d)

D

15.
a)

A

b)

B

c)

C

d)

D

16.
a)

A

b)

B

c)

C

d)

D

17.
a)

A

b)

B

c)

C

d)

D

18.
a)

A

b)

B

c)

C

d)

D

19.
a)

A

b)

B

c)

C

d)

D

20.
a)

A

b)

B

c)

C

d)

D

21.

check the following soluble salts

a)

magnesium sulfates

b)

lead chloride

c)

calcium sulfate

d)

ammonium carbonate

22.

check the insoluble salts

a)

silver bromide

b)

lead sulfate

c)

potassium chloride

d)

copper(II) carbonates

23.

sodium phosphate

a)

soluble salt

b)

insoluble salt

24.

silver chloride

a)

soluble salts

b)

insoluble salts

25.

what is the best method to prepare barium sulfate?

you may tick more than one answer if applied

a)

reacting excess barium metal to sulfuric acid

b)

reacting excess barium oxide/barium carbonate to sulfuric acid

c)

reacting barium hydroxide to sulfuric acid by titration

d)

reacting barium nitrate to sulfuric acid by precipitation

26.

Which salt can be prepared using titration?

a)

copper(II) nitrate

b)

lead(II) sulfate

c)

ammonium sulfate

d)

iron(II) chloride

27.

Name the method of preparation for potassium sulfate.

a)

Reaction of acid with insoluble substances

b)

Titration

c)

Precipitation

28.

Which method of preparation of a pure salt solution requires the use of a pipette and burette?

a)

BaCl2 + Na2SO4 --> BaSO4 + 2NaCl

b)

CuO + HCl --> CuCl2 + H2O

c)

NaOH + HCl --> NaCl + H2O

d)

MgCO3 + H2SO4 --> MgSO4 + H2O + CO2

29.

a)

A

b)

B

c)

C

d)

D

30.

a)

A

b)

B

c)

C

d)

D

31.

a)

A

b)

B

c)

C

d)

D

32.

a)

A

b)

B

c)

C

d)

D

33.

a)

A

b)

B

c)

C

d)

D

34.

Which of the following apparatus is essential in the preparation of ammonium chloride using titration?

(You may select more than one)

a)

pipette

b)

burette

c)

measuring cylinder

d)

beaker

35.

Which is the most suitable method for separating the products of the reaction below:


NaCl (aq) + AgNO3 (aq) --> AgCl (s) + NaNO3 (aq)

a)

chromatography

b)

crystallisation

c)

distillation

d)

filtration

36.

A student was asked to prepare a sample of magnesium sulfate, and chose a solid to add to sulfuric acid. The experiment failed.


Which solid was chosen?

a)

magnesium carbonate

b)

magnesium nitrate

c)

magnesium

d)

magnesium oxide

37.

Which method is used to prepare silver chloride?

a)

Add excess solid reactant to acid

b)

Titration

c)

Precipitation

38.
What is the white tile for in titration?
a)
To help clearly see the colour change
b)
To protect the conical flask 
c)
To add extra height
d)
To assist the reaction
39.
what is the reading on this burette?
a)
4.40mL
b)
3.50mL
c)
3.60mL
d)
4.50mL
40.

What is an Arrhenius base?

a)

A substance that produces H+ ion in water

b)

A substance that produces OH- ion in water.

c)

A substance that produces OH+ ion in water

d)

A substance that produces H- ion in water.

41.

A student tests an unknown aqueous solution and finds it conducts electricity and turns litmus paper red. What can the student infer?

a)

The solution contains an acid.

b)

The solution contains a base.

c)

The solutions is neutral.

42.

Label the acid, base, conjugate acid and conjugate base.

a)acid
b)base
c)conjugate acid
d)conjugate base
1
2
3
4
1)
2)
3)
4)
43.

Click on the acid.

A
B
C
D
44.

Click on the base.

A
B
C
D
45.

Click on the conjugate base.

A
B
C
D
46.

Click on the conjugate acid.

A
B
C
D
47.

According to Bronsted-Lowry, what does an acid do?

a)

It donates a proton (H+).

b)

It accepts a proton (H+)

c)

It produces H+ in water.

d)

It produces OH- in water.

48.

According to Bronsted-Lowry, what does a base do?

a)

It donates a proton (H+).

b)

It accepts a proton (H+)

c)

It produces H+ in water.

d)

It produces OH- in water.

49.
What is the pOH of a solution that has a pH of 2?
a)
10
b)
12
c)
14
d)
1
50.

Phenolophalein turns from clear to pink when the pH turns

a)

acidic

b)

basic

c)

saline

d)

ionic

51.

What completely ionizes in solution?

a)

Weak acids

b)

Strong acids

c)

Strong Salts

d)

Neutral salts

52.

Bases, also known as ​ (a)   will turn litmus paper ​ (b)   . This is because they have a pH ​ (c)   . They taste ​ (d)   .

Choose from the below words
alkali and OH-
blue
above 7
bitter
below 7
H+
red
sour
53.

NaOH is a strong base.

What is the pH of a 0.01 M NaOH soltuion?

a)

2

b)

9

c)

12

d)

14

54.

Which type of ion does an acid produce when it is dissolved in water?

a)

oxide

b)

oxygen

c)

hydronium

d)

hydroxide

55.
The pH scale measures...
a)
...the strength of an acid.
b)
...the strength of hydrogen ions.
c)
...the concentration of hydrogen ions.
d)
...the concentration of an acid
56.

What is the pH of a solution if [H+] = 1.0 x 10-5M?

a)

5.00

b)

7.00

c)

9.00

d)

11.00

57.

In the equation below, H2O would be considered a ______

NH3 + H2O --> NH4+ + OH-

a)

Bronsted-Lowry Acid

b)

Bronsted-Lowry Base

c)

Salt

58.

A sting from insect X has a pH of 6 and a sting from insect Y has a pH of 8. The table shows the pH of four substances.

Which substances are used to treat the two stings?

a)

A X = hydrochloric acid; Y = sodium hydroxide

b)

B X = sodium hydrogen carbonate; Y = vinegar

c)

C X = sodium hydroxide; Y = hydrochloric acid

d)

D X = vinegar ; Y = sodium hydrogen carbonate

59.

The table shows the pH of four aqueous solutions, W, X, Y and Z.

Universal Indicator is added to each solution.

Which row in the second table shows the colour of each solution after the indicator is added?

a)

A

b)

B

c)

C

d)

D

60.
What are the coefficients when the equation is balanced?
a)
2 + 3 --> 2 + 3 + 4
b)
1 + 3 --> 1 + 3 + 2
c)
2 + 4 --> 2 + 3 + 2
d)
1 + 1 --> 1 + 1 + 1
61.
What is oxidation number of Cr in Cr2O72-?
a)
-2
b)
+2
c)
+6
d)
+12
62.
What is oxidation number of H in CaH2?
a)
+1
b)
-1
c)
0
d)
+2
63.
If in a reaction, copper is reduced; its number of electrons has:
a)
Increased
b)
Decreased
c)
Remained Constant
d)
Varies Randomly
64.
In the reaction
2Ca(s) + O2(g) --> 2CaO(s), calcium is __________
a)
Reduced
b)
Synthesized
c)
Oxidized
d)
None of the above
65.
     In the reaction Zn + H2O --> ZnO2 + H2
 which element, if any, is oxidized? 
a)
Zinc
b)
Hydrogen
c)
Oxygen
d)
None
66.

Al (s) + FeSO4 (aq) → Al2(SO4)3 (aq) + Fe (s)

Which statements are true about this reaction?

I. Al (s) loses electrons

II. Al (s) is the oxidizing agent.

III. FeSO4 is the reducing agent.

a)

I and II

b)

I only

c)

II and III

d)

I, II and III

67.

What is the oxidation number of iodine in KIO3?

a)

0

b)

-1

c)

+5

d)

+1

68.

Which of the following half reactions correctly represents a reduction half reaction?

a)

Fe →Fe2+ + 2e-

b)

Pb4+ + 2e- →Pb2+

c)

2O-2 →O2 + 4e-

d)

Fe + 3e- →Fe3+

69.
Which change does nitrogen undergo oxidation?
a)
A
b)
B
c)
C
d)
D
70.

Combustion and single-replacement reactions are __________ redox reactions.

a)

always

b)

never

c)

sometimes

d)

mostly

71.
What is oxidation number of H in H2O?
a)
0
b)
-2
c)
-1
d)
+1
72.

What is the oxidation number of N in NO2-1?

a)
-3
b)
+4
c)
-2
d)
+3
73.

Which row correctly describes oxidation in terms of oxygen, electrons and oxidation state?

a)

A

b)

B

c)

C

d)

D

74.

Magnesium reacts with iron(III) oxide in the following reaction.

a)

A

b)

B

c)

C

d)

D

75.

Lead(II) oxide undergoes a number of different redox reactions. In which of the following reactions is lead(II) oxide,PbO, not reduced?

a)

A

b)

B

c)

C

d)

D

76.

The following equations are all examples of redox reactions. In which equation is the underlined substance being oxidised?

a)

A

b)

B

c)

C

d)

D

77.

Three reactions are shown below.

NO+O3 →NO2 +O2

2C +O2 → 2CO

2MgO+O2 → 2MgO

Which row correctly describes the process each reactant molecule undergoes?

a)

A

b)

B

c)

C

d)

D

78.

In which reaction is the reactant being reduced?

a)

A

b)

B

c)

C

d)

D

79.

Which one is a Disproportionation reaction?

a)

just a

b)

a and b

c)

b and c

d)

just c

80.
a)

A

b)

B

c)

C

d)

D

81.
a)

A

b)

B

c)

C

d)

D

82.
a)

A

b)

B

c)

C

d)

D

83.
a)

A

b)

B

c)

C

d)

D

84.
a)

A

b)

B

c)

C

d)

D

85.
a)

A

b)

B

c)

C

d)

D

86.
a)

A

b)

B

c)

C

d)

D

87.
a)

A

b)

B

c)

C

d)

D

88.
a)

A

b)

B

c)

C

d)

D

89.
a)

A

b)

B

c)

C

d)

D

90.
a)

A

b)

B

c)

C

d)

D

91.

What are boiling water and dissolving sugar

a)

A Physical change

b)

A element

c)

A Molecule

d)

A Chemical Change

92.

What is the definition of Malleability?

a)

How easily a substance bends

b)

How well heat passes through a substance

c)

How easily a substance catches fire

d)

How easily a substance can be hammered into different shapes

93.

Which are the correct properties for a typical metal?

a)

Strong and Dull

b)

Low Melting and Boiling points

c)

High density and shiny

d)

Hard and Brittle

94.

Which three metal elements are magnetic?

a)

Iron, Zinc and Aluminium

b)

Magnesium, Nickel and Copper

c)

Copper, Gold and Silver

d)

Iron, Cobalt and Nickel

95.

Which is the only non-metal element, that is a good conductor of electricity?

a)

Graphite

b)

Carbon

c)

Nitrogen

d)

Neon

96.

Steel is a(n) ____.

a)

Compound

b)

Pure substance

c)

Alloy

d)

Element

97.

The sodium found in the human body typically has 11 protons, 12 neutrons and 10 electrons. What is the charge of the sodium ions found in the human body?

a)

-2

b)

12

c)

+1

d)

0

98.

A doctor prescribes a tablet with 0.050 grams of aspirin to his patient to reduce blood clotting. To write the number as "50" on the prescription pad, what unit should he use?

a)

Milligram

b)

Picogram

c)

Gram

d)

Kilogram

99.

In which group of the periodic table would an element be located if it is hard and dense, very reactive, and tends to give away two electrons?

a)

Group 1

b)

Group 17

c)

Group 2

d)

Group 18

100.

Dew, a water droplet, forms on the grass during a cool spring night as a result of what process?

a)

Condensation

b)

Deposition

c)

Freezing

d)

Sublimation

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