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27 Cards in this Set
- Front
- Back
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What colours do litmus paper turn? |
Red or blue |
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What colour is a strong acid? |
Red |
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What colour is a weak acid? |
Orange or yellow |
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What colour is a strong base? |
Purple |
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What colour is a weak base? |
Blue |
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What colour is nutural |
Green |
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What do indicators do? |
Change colour to show an acid or base |
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pH is? |
Number that shows how acidic or basic a substance is |
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What do Acids do? |
Donate H+ eg. HCL (hydrochloric acid), H2SO4 (sulfuric acid), HNO3 (nitric acid) |
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When the pH is corrosive and under 7 the taste is? |
Sour |
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What do Bases do? |
React with H. Eg. NaOH (sodium hydroxide), NgCO3 (magnesium carbonate) |
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What do Bases react with a taste like? |
They taste bitter and react with fats to make soup |
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Neutralization is? |
Acid+base -------》salt + water |
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Chemistry is? |
Study of atoms & molecules, including reactions |
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Atoms are? |
Building blocks of matter |
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Reaction is? |
Chemical change (atoms re combine to make new molecules). |
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Physical change is? |
State or shape change |
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Signs of reaction |
Gas is given off, flame I'd seen, new smell, colour change, new substance, change in temperature |
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Atomic number is? |
Number of protons (& electrons) |
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Proton |
In nucleus has mass, positive charge. |
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Electron |
Orbits around nucleus, no mass, negative charge |
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Elements are? |
One atom type |
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Compounds are? |
Two atom types joined |
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How many electrons does the first shell of atom hold? |
2 |
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How many electrons does the second shell of atom hold? |
8 |
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How many electrons does the third shell of atom hold? |
8 |
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How many electrons does the fourth shell of atom hold? |
18 |
