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!