Unit 1 National 5 Chemistry Question Preview (ID: 58989)
Unit 1 National 5 Chemistry.
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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) 30/2
c) 1/2
d) 2/30
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) 0.2
b) 0.4
c) 2.5
d) 5.0
An atom has 26 protons, 26 electrons and 30 neutrons. The atom has:
a) atomic number 26, mass number 56
b) atomic number 56, mass number 30
c) atomic number 30, mass number 26
d) atomic number 52, mass number 56.
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) Cl⁻
b) S²⁻
c) Ar
d) Na⁺
What is the charge on the chromium ion in CrCl₃?
a) 1+
b) 1-
c) 3+
d) 3-
Which of the following elements does NOT exist as diatomic molecules?
a) Oxygen
b) Helium
c) Bromine
d) Hydrogen
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) Magnesium
c) Fluorine
d) Neon
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.
A student made some statements about the effect of adding water to an acidic solution. Identify the correct statement.
a) The pH of the solution will remain the same.
b) The pH of the solution will decrease.
c) The hydrogen ion concentration will decrease.
d) The hydrogen ion concentration will increase.
Which of the following compounds is a base?
a) Sodium oxide
b) Calcium chloride
c) Potassium nitrate
d) Ammonium sulfate
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) Na₂O
b) LiF
c) KBr
d) MgCl₂
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) 1
b) 2
c) 7
d) 8
Which term can be used to describe the shape of a phosphorus trifluoride (PF₃) molecule?
a) Linear
b) Angular
c) Tetrahedral
d) Trigonal pyramidal
Limewater can be made by dissolving calcium hydroxide in water. Which of the following terms correctly describes calcium hydroxide?
a) Solute
b) Solvent
c) Solution
d) Insoluble
AgNO₃(aq) + KCl(aq) ---) AgCl(s) + KNO₃(aq)
a) Ag⁺ and Cl⁻
b) K⁺ and NO₃⁻
c) Ag⁺and NO₃⁻
d) K⁺ and Cl⁻
0·25 moles of a gas has a mass of 7 g. Identify the correct formula for the gas.
a) C₂H₆
b) C₂H₄
c) C₃H₈
d) C₃H₆
What is the charge on the zinc ion in the compound zinc phosphate Zn₃(PO₄)₂?
a) 2+
b) 3+
c) 2-
d) 3-
An acidic solution contains
a) A only hydrogen ions
b) only hydroxide ions
c) more hydrogen ions than hydroxide ions
d) more hydroxide ions than hydrogen ions.
Which of the following oxides, when shaken with water, would give an alkaline solution?
a) Calcium oxide
b) Nickel oxide
c) Nitrogen dioxide
d) Sulfur dioxide
Which of the following compounds is NOT a salt?
a) Calcium nitrate
b) B Sodium chloride
c) Potassium sulfate
d) Magnesium hydroxide
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