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OGUN STATE JUNIOR SCIENCE OLYMPIAD FINAL CHEMISTRY

Total questions: 20

Worksheet time: 10mins

Name
Class
Date
1.

Which of the following is the unhybridized orbital in sp2 carbon hybridization?

a)

2px

b)

2py

c)

2pz

d)

All of the above

2.

Find the coefficient of oxygen in the balanced chemical reaction of NH3+O2NO2+H2O\mathrm{NH_3 + O_2 \rightarrow NO_2 + H_2O} .

a)

1

b)

4

c)

3

d)

7

3.

In which of the following will the reaction occur rapidly?

a)

Between ions in aqueous solution because little energy is needed to break the bonds since the ions are already dissociated

b)

Between all gases because they have greater average kinetic energy

4.

Each of the reactants has a mass of 5 g. Which of the following specie is the limiting reactant in the equation 2KMnO4+5Hg2Cl2+16HCl2MnCl2+10HgCl2+8H2O+2KCl\mathrm{2\,KMnO_4 + 5\,Hg_2Cl_2 + 16\,HCl \rightarrow 2\,MnCl_2 + 10\,HgCl_2 + 8\,H_2O + 2\,KCl} ?

a)

Hg2Cl2

b)

KMnO4

c)

H2O

d)

HCl

5.

If an Endothermic is placed in air, the temperature of the surrounding will ___ with time

a)

Decrease

b)

Increase

c)

Remain constant

d)

Zero

6.

Temperature change of in a chemical reaction is as a result of exchange of heat

a)

between System and surrounding

b)

between System and universe

c)

between Universe and surrounding

d)

Within the system

7.

Arrange in the order of proximity to the nucleus

a)

Sp < sp2 < sp3

b)

Sp > sp2 > sp3

c)

Sp3 < Sp2 < Sp

8.

If E° of a cell is 1.00V-1.00\,\mathrm{V} , the reaction is?

a)

Spontaneous

b)

Non spontaneous

c)

Has ΔG\Delta G to be +ve

d)

Has ΔG\Delta G to be -ve

9.

Convert 123C123^{\circ}\mathrm{C} to Kelvin

a)

396 K

b)

300 K

c)

273 K

d)

246 K

10.

An endothermic reaction is happening in a closed system at a rapid rate. If it is put into the surrounding, the temperature of the environment __________

a)

Decreases

b)

remains unaffected

c)

Increases

11.

Px, Py and Pz are referred to as degenerate orbitals because?

a)

They have the same energy level

b)

They have the same orientation

12.

If two orbitals have the same (n+l) values, the one with the lower energy has lower

a)

Magnetic quantum number

b)

Spin quantum number

c)

Azimuthal quantum number

d)

Principal quantum number

13.

What is the electronic configuration of Carbon?

a)

1s2 2s2 2px2

b)

1s2 2s1 2px1 2py1

c)

1s2 2s2 2px1 2py1

14.

Calculate the mass of copper deposited at the cathode in the electrolysis of CuSO4 by 1 F (Cu = 63.5)

a)

15.88 g

b)

31.75 g

c)

63.50 g

d)

47.63 g

15.

Calculate the number of F used in the deposition of 21.58 g of Ag at the cathode (Ag = 107.9)

a)

0.10 F

b)

0.20 F

c)

0.50 F

d)

1.00 F

16.

Calculate the value of 6.00% of NiSO4 of a solution that contains 40 g of NiSO4

a)

2.40 g

b)

6.00 g

c)

0.60 g

d)

4.00 g

17.

Which of the following refers to the breakdown of a heavy isotope into two or more smaller isotopes with the release of energy

a)

Nuclear transmutation

b)

Electron capture

c)

Nuclear fission

d)

Nuclear fusion

18.

Which heat change is the most positive?

a)

Combustion

b)

Vaporization

c)

Fusion

d)

Sublimation

19.

Which endothermic change will be the greatest for 5 g of H2O

a)

Condensation

b)

Melting

c)

Vaporization

d)

Freezing

20.

Which physical property differentiates atoms that are isotopes?

a)

Electronic configuration

b)

Mass number

c)

Cannot remember