Unit 1 National 5 Chemistry Question Preview (ID: 58989)


Unit 1 National 5 Chemistry. TEACHERS: click here for quick copy question ID numbers.

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

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

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.

What is the charge on the zinc ion in the compound zinc phosphate Zn₃(PO₄)₂?
a) 2+
b) 3+
c) 2-
d) 3-

AgNO₃(aq) + KCl(aq) ---) AgCl(s) + KNO₃(aq)
a) Ag⁺ and Cl⁻
b) K⁺ and NO₃⁻
c) Ag⁺and NO₃⁻
d) K⁺ and Cl⁻

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

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 oxides, when shaken with water, would give an alkaline solution?
a) Calcium oxide
b) Nickel oxide
c) Nitrogen dioxide
d) Sulfur dioxide

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.

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

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 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⁺

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.

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

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

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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