1.
State what is meant by an ionic bond. [1]
JD SCIENCE
Unit 2 worksheet — Bonding, structure and the properties of matter
Answer all questions. Show working. Answers are in a separate file on the Worksheets page — do not look at them until you have finished.
2.
State what is meant by a covalent bond. [1]
3.
State what is meant by a metallic bond. [1]
4.
State what is meant by a giant ionic lattice. [1]
5.
State what is meant by a simple molecule. [1]
6.
State what is meant by graphite. [1]
7.
State what is meant by graphene. [1]
8.
State what is meant by a polymer. [1]
9.
State what is meant by a nanoparticle. [1]
10.
State what is meant by an intermolecular force. [1]
11.
Amira is asked about an ionic bond in a AQA Chemistry paper.
(a) Describe an ionic bond. [2]
(b) Explain why an ionic bond is important in this topic. [3]
12.
Amira is asked about a covalent bond in a AQA Chemistry paper.
(a) Describe a covalent bond. [2]
(b) Explain why a covalent bond is important in this topic. [3]
13.
Amira is asked about a metallic bond in a AQA Chemistry paper.
(a) Describe a metallic bond. [2]
(b) Explain why a metallic bond is important in this topic. [3]
14.
Amira is asked about a giant ionic lattice in a AQA Chemistry paper.
(a) Describe a giant ionic lattice. [2]
(b) Explain why a giant ionic lattice is important in this topic. [3]
15.
Amira is asked about a simple molecule in a AQA Chemistry paper.
(a) Describe a simple molecule. [2]
(b) Explain why a simple molecule is important in this topic. [3]
16.
Amira is asked about graphite in a AQA Chemistry paper.
(a) Describe graphite. [2]
(b) Explain why graphite is important in this topic. [3]
17.
A cube nanoparticle of side 2 nm. Estimate SA:V compared with a 2 m cube (qualitative then ratio idea). [3]
18.
How many covalent bonds does a carbon atom form in diamond? [3]
19.
Na has 11 electrons. Write the ion and the electron configuration of Na⁺. [3]
20.
The formula of magnesium chloride. Mg is 2+ and Cl is 1−. [3]
21.
A polymer repeat unit is C₂H₄. What is the empirical formula? [3]
22.
Rf = distance spot / distance solvent. Spot 3.6 cm, solvent 6.0 cm. Rf? [3]
23.
Amira carries out melting-point comparison of ionic vs simple molecular substances. This is a typical AQA required-practical style question.
(a) Identify the independent variable and the dependent variable. [2]
(b) State one control variable and explain why it must be controlled. [2]
(c) Suggest one improvement or source of error and how it affects the result. [2]
24.
Amira carries out testing electrical conductivity of solid, molten and dissolved samples. This is a typical AQA required-practical style question.
(a) Identify the independent variable and the dependent variable. [2]
(b) State one control variable and explain why it must be controlled. [2]
(c) Suggest one improvement or source of error and how it affects the result. [2]
25.
Amira carries out building ball-and-stick models of CH₄, H₂O, CO₂, NaCl. This is a typical AQA required-practical style question.
(a) Identify the independent variable and the dependent variable. [2]
(b) State one control variable and explain why it must be controlled. [2]
(c) Suggest one improvement or source of error and how it affects the result. [2]
26.
Amira carries out chromatography to identify a mixture of dyes. This is a typical AQA required-practical style question.
(a) Identify the independent variable and the dependent variable. [2]
(b) State one control variable and explain why it must be controlled. [2]
(c) Suggest one improvement or source of error and how it affects the result. [2]
27.
Compare ionic bonding with covalent bonding. [4]
28.
Compare diamond with graphite. [4]
29.
Compare a metal with an ionic solid. [4]
30.
Compare simple molecular with giant covalent. [4]
31.
Apply your knowledge of graphene to this situation: conducts and is very thin [3]
32.
Apply your knowledge of a polymer to this situation: cross-links [3]