March 29, 2008

General Chemistry (Part 2): Questions for X Level

The following questions are about:
  • All mater
  • Elements, compounds, and mixtures
  • Atomic structure and Periodic Table
  • Bonding and structure
  • Chemical calculation

1) Which one is a compound?

A. A leaf

B. A paper

C. A pocket of dry ice

D. A tube of toothpaste

2) Which of the following electronic configurations represents an element that will form possible one simple ion with a charge of –3?

A. 1s2 2s2 2p6 3s2 3p1

B. 1s2 2s2 2p6 3s2 3p3

C. 1s2 2s2 2p6 3s2 3p6 4s2 3d1

D. 1s2 2s2 2p6 3s2 3p1 4s2 3d3

3) Which of the following ions contains unpaired electrons?

A. Fe2+ (Z = 26)

B. Mg2+ (Z = 12)

C. Ti4+ (Z = 22)

D. Zn2+ (Z = 30)

4) The successive ionization energies, in kJ.mol–1, of an element X are 870; 1800; 3000; 3600; 5900; 7000; 13200. What is X?

A. 33As

B. 35Br

C. 53I

D. 52Te

5) The atoms X and Y have the electronic configurations shown below:

X: 1s2 2s2 sp6 3s2 3p1 4s2 3d10

Y: 1s2 2s2 2p4

Which one of the following compounds are they likely to form?

A. XY

B. XY2

C. X2Y

D. X2Y3

6) The electronic configuration of A and B are shown below:

A: 1s2 2s2 sp6 3s2 3p1 4s2

B: 1s2 2s2 sp6 3s2 3p5

What is the bonding type of the compound formed?

A. Ionic bonding

B. Covalent bonding

C. Covalent double bonding

D. Covalent coordinate bonding

7) In absence of catalyst, ammonia burns in oxygen to produce steam and nitrogen. What is gas and its volume remaining when 100 cm3 of ammonia is burned in 125 cm3 of oxygen? (All volumes are being measured at the same temperature and pressure).

A. 33.3 cm3 of ammonia

B. 66.7 cm3 of ammonia

C. 50 cm3 of oxygen

D. 75 cm3 of oxygen

8) How many grams of sodium hydroxide do you need to add into 0.2 liters of magnesium chloride 1 M to produce 5.8 grams of settled magnesium hydroxide? (Ar H = 1, O = 16, Na = 23, Mg = 24)

A. 4 grams

B. 8 grams

C. 16 grams

D. 32 grams

9) Which solution will have the highest electricity conduction hence they all are 1 M?

A. HCl

B. HNO3

C. H2SO4

D. H3PO4

Write your answer in dark blue or black pen.

Do not use highlighters, glue, or correction fluid on your answer sheet.

10) There are 3 elements: A, B, C. They three are in same period of period system.

A and B are metals.

B is an explosive metal when it is burned with some water.

C is a polyatomic element which is in right side-neighbor of A.

a) Determine reactivity of those elements with oxygen from the highest to the lowest.

b) Suggest a real atomic symbol for each element.

11) A number of aluminum is added into aqueous sulfuric acid. A half of volume of gas produced is passed through a nitrogen tube and heated to produce ammonia. The ammonia is measured and it shows 2.24 liters of volume. How many grams of initial aluminum should be added? (Ar Al = 27)

Good Luck!

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2 Comments:

Anonymous Anonymous said...

thx for the questions

it'll help me much

March 31, 2008  
Blogger wyd said...

welcome...

thx for visiting

April 01, 2008  

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