18 questions at Form 4
Most triedMost missedNewest- Changing directly from a solid to a gas is called…
- Why does a gas spread out to fill a room?
- Which method separates the dyes in ink?
- Which method gets pure water from sea water?
- A pure substance melts…
- Which particle has a negative charge?
- An atom has 11 protons and 12 neutrons. What is its mass number?
- Atoms of the same element with different numbers of neutrons are…
- What is the electronic configuration of magnesium (12 electrons)?
- Elements in the same group of the Periodic Table have the same…
- Group 0 (8) elements are unreactive because…
- Ionic bonding happens between…
- Covalent bonds are formed by…
- Why does sodium chloride conduct electricity when molten?
- Which substance has a giant covalent structure?
- What is the formula of calcium chloride?
- What is the relative formula mass of CO₂? (C = 12, O = 16)
- Balance: __H₂ + O₂ → __H₂O