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What’s a molecule? (simply)
2 or more atoms bonded together
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What’s a compound? (simply)
Different atoms bonded together
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What is the structure of molecules when something is solid, liquid, gas or plasma?
- Solid- tightly packed
- Liquid- less tightly packed
- Gas- delocalised, more disorder
- Plasma- charged particles
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What’s meant by physical change?
- Not involving chemical change
- Example: ice to water to gas
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Can there be different boiling points for different properties?
- Yes
- Eg. Alcohol (ethanol) 78*C , Water is 100*C
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Two types of energy?
- Potential (block of wood)
- Kinetic (light and heat when burnt)
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What occurs- chemical change, physical change or both in H2O(l) —> H2O(g)?
- No chemical change
- But physical change
- Tightly packed molecules —> disordered
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What does K mean in the periodic table?
Potassium
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What is CO?
Carbon Monoxide
(Which wants to join to O to make CO2- carbon dioxide)
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What king of charge has an electron?
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Can you weigh an electron, neutron, proton!
- Electron - no , way too light
- Protons yes
- Neutrons yes
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Where’s the neutrons, electrons and protons located in an atom?
- Neutrons- nucleus (no charge)
- Protons - nucleus
- Electrons - in orbitals (orbiting the nucleus)
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How is the weight of an atom calculated?
Adding neutrons and protons
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Oxygen has 8 protons. Usually 8 neutrons and weighs on average 15.999. Sometimes it can have how many neutrons?
7 (brings down weight)
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Why are there neutrons in nucleus?
The protons would blow apart. Neutrons act as packing material.
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12
C How many neutrons in nucleus?
6
12-6 = 6
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