Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Principles of Chemistry
991 practice questions
Topics covered
- States of Matter102 practice questions
- Elements, Compounds and Mixtures69 practice questions
- Atomic Structure108 practice questions
- The Periodic Table103 practice questions
- Chemical Formulae, Equations and Calculations Part 119 practice questions
- Chemical Formulae, Equations and Calculations Part 2144 practice questions
- Ionic Bonding143 practice questions
- Covalent Bonding68 practice questions
- Metallic Bonding19 practice questions
- Electrolysis198 practice questions
Practice questions
141–150 of 407 · Easy
Question 141
2 marks · Easy
Answer and see the solution →Calcium (Ca) forms an oxide when it reacts with oxygen. The formula of the oxide is either CaO or CaO2. Using your knowledge of the periodic table, determine which formula is correct for the oxide of calcium and state how many oxygen atoms are present in the formula.
Question 142
2 marks · Easy
Answer and see the solution →Explain, using your knowledge of the periodic table, why elements in Group 2 have similar chemical properties.
Question 143
1 mark · Easy
Answer and see the solution →State whether chlorine is a metal or a non-metal, based on its position in the periodic table.
Question 144
3 marks · Easy
Answer and see the solution →This question is about group trends in the periodic table.
(a)[1 mark]State how many electrons a typical Group 7 element has in its outer shell.
(b)[2 marks]Explain why the elements fluorine and bromine have similar chemical properties.
Question 145
2 marks · Easy
Answer and see the solution →An oxide of aluminium (Al) reacts with hydrochloric acid to produce 27 grams of aluminium chloride. Given the information below, use the periodic table and your knowledge of metals and oxides to calculate the number of moles of aluminium chloride formed. (Al = 27, Cl = 35.5)
Question 146
1 mark · Easy
Answer and see the solution →State whether most metals are malleable or brittle.
Question 147
3 marks · Easy
Answer and see the solution →The table lists four elements: sodium, aluminium, sulfur and silicon.
(a)[2 marks]State whether each of these elements conducts electricity or not (at room temperature).
(b)[1 mark]Name one exception among non-metals that conducts electricity.
Question 148
2 marks · Easy
Answer and see the solution →Diamond is a form of carbon, a non-metal, but it is the best conductor of heat of all the elements. Explain why diamond is still considered a non-metal despite this property.
Question 149
3 marks · Easy
Answer and see the solution →The following table shows whether certain elements conduct electricity at room temperature:
Element Conducts electricity? Magnesium Yes Bromine No Lead Yes Iodine No (a)[1 mark]Identify which two elements in the table are non-metals.
(b)[1 mark]State what the data shows about the electrical conductivity of metals compared to non-metals.
(c)[1 mark]Give one reason why electrical wires are not made from non-metals.
Question 150
1 mark · Easy
Answer and see the solution →State whether the oxide of carbon is acidic, basic, or amphoteric.