Chemical Bonding and Structure
From the lesson
26 marksWhat is the formula of aluminium sulfate?
Learners' Alley, Bonding and Structure slides
Which compound has the highest melting point?
Learners' Alley, Bonding and Structure slides
How many σ and π bonds are in one molecule of ethene, H2C=CH2?
Learners' Alley, Bonding and Structure slides
Which molecule is polar?
Learners' Alley, Bonding and Structure slides
Which has the highest boiling point?
Learners' Alley, Bonding and Structure slides
Learners' Alley, Chemical Bonding and Structure slides
Learners' Alley, Chemical Bonding and Structure slides
Learners' Alley, Chemical Bonding and Structure slides
Draw dot-and-cross diagrams for these molecules. Show outer electrons only.
Learners' Alley, Chemical Bonding and Structure slides
State the shape and bond angle of each molecule.
Learners' Alley, Chemical Bonding and Structure slides
Learners' Alley, Chemical Bonding and Structure slides
Learners' Alley, Chemical Bonding and Structure slides
Learners' Alley, Chemical Bonding and Structure slides
Practice
17 marksSodium is a grey solid. Chlorine is a yellowish-green gas. When sodium is heated and mixed with chlorine, a reaction takes place and a white crystalline substance called sodium chloride is formed. Which statement about sodium chloride is correct?
2024 Zhenghua O Prelim P1-P3 Q8
The electronic configurations of three particles, X, Y and Z, are shown.
| particle | electronic configuration |
|---|---|
| X | 2.1 |
| Y | 1 |
| Z | 2.8.7 |
Which statement is true about these three particles?
2025 FHSS O Prelim P1 Q8
Elements X and Y react to form an ionic compound of formula XY2. Which row correctly shows the electronic configurations of atoms X and Y? Each option gives X, then Y.
2025 CHIJ O Prelim P1 Q6
The electronic configurations of elements X and Y are X: 2.8.3 and Y: 2.6. Element X and element Y react together to form a compound. Which row shows the electron transfer that takes place and the type of compound formed?
| element X | element Y | type of compound | |
|---|---|---|---|
| A | 2 atoms each lose 3 electrons | 3 atoms each receive 2 electrons | covalent |
| B | 2 atoms each lose 3 electrons | 3 atoms each receive 2 electrons | ionic |
| C | 2 atoms each receive 3 electrons | 3 atoms each lose 2 electrons | covalent |
| D | 2 atoms each receive 3 electrons | 3 atoms each receive 2 electrons | ionic |
2024 SKSS O Prelim P1 Q7
Which statement best explains why potassium chloride has a lower melting point than calcium oxide?
2025 Compassvale O Prelim P1 Q12
Both calcium chloride and potassium chloride are ionic compounds. Which statement about these compounds is correct?
2024 USS O Prelim P2 Q7
The table shows four elements P, Q, R and S with their atomic numbers.
| element | P | Q | R | S |
|---|---|---|---|---|
| atomic number | 6 | 12 | 13 | 8 |
What are the likely formulae of an ionic compound and a covalent compound formed from P, Q, R and S? Each option gives the ionic compound, then the covalent compound.
2024 Zhonghua O Prelim P1 Q9
What is the number of electrons and neutrons in a hydroxide ion? Each option gives the electrons, then the neutrons.
Source: 2024 SJI O Prelim P1 Q4
Which substance contains both ionic and covalent bonds?
2025 CCHY O Prelim P1 Q11
A substance Y
- has a high melting point
- is a good conductor of electricity
- is malleable.
What could Y be?
2025 CCHY O Prelim P1 Q12
Brass is an alloy made by adding zinc to copper. Brass is harder than pure copper, and the higher the percentage of zinc in the brass, the harder it is. Which statement best explains why brass is harder than pure copper?
2024 Zhonghua O Prelim P1 Q25
Which statement about metals is correct?
2024 SJI O Prelim P1 Q8
Which row shows the correct number of electrons used in covalent bonding in each molecule?
| ammonia | carbon dioxide | fluorine | nitrogen | |
|---|---|---|---|---|
| A | 6 | 4 | 2 | 4 |
| B | 6 | 8 | 2 | 6 |
| C | 6 | 4 | 2 | 6 |
| D | 6 | 8 | 2 | 4 |
2025 Compassvale O Prelim P1 Q11
Silicon dioxide has a giant covalent structure. Each silicon atom is joined to four oxygen atoms by covalent bonds. Which property would silicon dioxide be expected to have?
2026 KSS O Prelim P1 Q11
At room temperature and pressure, carbon dioxide is a gas while silicon dioxide is a solid. Which statement explains this?
2024 SJI O Prelim P1 Q9
Which two substances have similar three-dimensional arrangements of their atoms?
2024 YSS O Prelim P1 Q8
Which structure corresponds to its description of physical properties?
| structure | physical properties | |
|---|---|---|
| 1 | giant covalent | high melting point, conducts electricity when in solution but not when solid |
| 2 | simple molecular | low melting point, does not conduct electricity in any state |
| 3 | giant metallic | variety of melting points, conducts electricity when solid and when molten |
2025 TKGS O Prelim P1 Q9
