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Unit 1 National 5 Chemistry
Test Description: Unit 1 National 5 Chemistry
Instructions: Answer all questions to get your test result.
1) In a reaction, the mass lost in 30 seconds was 2 g. What is the average rate of reaction, in g s ⁻¹ , over this time?
A
1/30
B
1/2
C
2/30
D
30/2
2) The volume of gas collected in 2 minutes was 5 cm³ What was the average rate of reaction in cm³ min⁻¹ over this time?
A
0.4
B
0.2
C
5.0
D
2.5
3) An atom has 26 protons, 26 electrons and 30 neutrons. The atom has:
A
atomic number 56, mass number 30
B
atomic number 26, mass number 56
C
atomic number 52, mass number 56.
D
atomic number 30, mass number 26
4) Which of the following particles contains a different number of electrons from the others? You may wish to use the data booklet to help you.
A
S²⁻
B
Cl⁻
C
Na⁺
D
Ar
5) What is the charge on the chromium ion in CrCl₃?
A
1+
B
3+
C
3-
D
1-
6) Which of the following elements does NOT exist as diatomic molecules?
A
Oxygen
B
Bromine
C
Hydrogen
D
Helium
7) Which of the following elements forms an ion with a single positive charge and an electron arrangement of 2,8? You may wish to use the data booklet to help you.
A
Sodium
B
Fluorine
C
Magnesium
D
Neon
8) An alkaline solution contains
A
only hydroxide ions
B
more hydroxide ions than hydrogen ions
C
more hydrogen ions than hydroxide ions
D
equal numbers of hydrogen ions and hydroxide ions.
9) A student made some statements about the effect of adding water to an acidic solution. Identify the correct statement.
A
The hydrogen ion concentration will decrease.
B
The pH of the solution will remain the same.
C
The pH of the solution will decrease.
D
The hydrogen ion concentration will increase.
10) Which of the following compounds is a base?
A
Sodium oxide
B
Potassium nitrate
C
Ammonium sulfate
D
Calcium chloride
11) In which of the following compounds do the ions have the same electron arrangement? You may wish to use the data booklet to help you.
A
LiF
B
KBr
C
MgCl₂
D
Na₂O
12) Tennessine is a newly discovered element with a predicted electron arrangement of 2,8,18,32,32,18,7. In which Group is this element found?
A
7
B
1
C
2
D
8
13) Which term can be used to describe the shape of a phosphorus trifluoride (PF₃) molecule?
A
Linear
B
Angular
C
Trigonal pyramidal
D
Tetrahedral
14) Limewater can be made by dissolving calcium hydroxide in water. Which of the following terms correctly describes calcium hydroxide?
A
Solvent
B
Solution
C
Solute
D
Insoluble
15) AgNO₃(aq) + KCl(aq) ---) AgCl(s) + KNO₃(aq)
A
Ag⁺ and Cl⁻
B
K⁺ and Cl⁻
C
Ag⁺and NO₃⁻
D
K⁺ and NO₃⁻
16) 0·25 moles of a gas has a mass of 7 g. Identify the correct formula for the gas.
A
C₃H₈
B
C₂H₄
C
C₃H₆
D
C₂H₆
17) What is the charge on the zinc ion in the compound zinc phosphate Zn₃(PO₄)₂?
A
2+
B
3-
C
3+
D
2-
18) An acidic solution contains
A
more hydroxide ions than hydrogen ions.
B
only hydroxide ions
C
A only hydrogen ions
D
more hydrogen ions than hydroxide ions
19) Which of the following oxides, when shaken with water, would give an alkaline solution?
A
Calcium oxide
B
Sulfur dioxide
C
Nickel oxide
D
Nitrogen dioxide
20) Which of the following compounds is NOT a salt?
A
Magnesium hydroxide
B
B Sodium chloride
C
Potassium sulfate
D
Calcium nitrate
*select an answer for all questions
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