Grade 10 Chemistry Review — Quiz Questions 2 to 7
Alright, today we're studying for a Grade 10 chemistry quiz. We're focusing on questions 2 through 7. Let's start with chemical changes.
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Grade 10 Chemistry Review — Quiz Questions 2 to 7
Two hosts work through questions 2 to 7 of a Grade 10 chemistry quiz, one idea at a time, with the memory hooks you need to answer each one on the spot.
What this episode covers
- Evidence of a chemical change — the four signs to look for: heat or light given off, a precipitate forming, bubbles of gas or an odour, and a colour change. Chant them in that order and they stay put.
- Dalton's atomic model — atoms as indivisible solid balls, one atom type per element, identical atoms within an element, and fixed combining ratios.
- Thomson's cathode ray experiments — the discovery of electrons, why that broke Dalton's indivisible atom, and the plum pudding picture that replaced it.
- Isotopes — atomic number, mass number, and how to get neutrons. Worked with oxygen-18: 8 protons, 10 neutrons.
- Electron energy levels — sodium written as 2, 8, 1, and a calcium ion with a 2+ charge down to 18 electrons in a 2, 8, 8 arrangement.
- Ions — why losing electrons makes an atom positive and gaining them makes it negative, checked against aluminum 3+ and sulfide 2−.
- Identifying an unknown chemical — how to build a flow chart from your observations, starting with whether the solution is clear, until only one chemical from the table fits.
Quick answers
| Question | Answer |
|---|---|
| Evidence of a chemical change | Heat or light, precipitate, gas or odour, colour change |
| Dalton | Indivisible atoms |
| Thomson | Electrons and the plum pudding model |
| Isotopes | Same element, different numbers of neutrons |
| Neutrons | Mass number minus atomic number |
| Positive ion | Lost electrons |
| Negative ion | Gained electrons |
| Unknown chemical | Use observations and a flow chart to narrow it down |
That is questions 2 through 7. Press play and study along.
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