Topic 0- Metals Flashcards Preview

IGSCE Chemistry- Part 1 > Topic 0- Metals > Flashcards

Flashcards in Topic 0- Metals Deck (10)
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1

what is an ion?

an ion is an atom or molecule with a net electric charge due to the loss or gain of one or more electrons

2

what are positively charged ions called?

cations

3

what are negatively charged ions called?

anions

4

what happens when an atom gains an electron?

if an atom gains an electron it becomes a negatively charged ion. Non- metals tend to do this and they form anions. So elements from 5-7 will form anions.

5

what happens when an atom loses an electron?

if an atom loses an electron it becomes a positively charged ion. Metals tend to do this and they from cations, so normally elements from groups 1-3 will form cations.

6

what is a synthesis reaction?

a type of chemical reaction in which two or more substances combine and form one compound. You can recognise a synthesis reaction because two or more reactants only from one product

7

what is a decomposition reaction?

in a decomposition reaction, one compound breaks down and forms two or more substances. You can recognise a decomposition reaction because one reactant forms two or more products. Decomposition is the reverse of synthesis.

8

what is a single-displacement reaction?

in a single-displacement reaction, one element replaces another element in a compound. In this type of reaction, an element and a compound react and form a different element and a different compound

9

what is a double-displacement reaction?

in a double-displacement reaction, the negative ions in two compound switch places, forming two new compounds. In this type of reaction, two compounds react and form two new compounds

10

what is a combustion reaction?

combustion is a chemical reaction in which a substance combines with oxygen and releases energy. A combustion reaction usually releases energy as thermal energy and light energy. Burning is a common combustion reaction. These reactions always produce co2 and water.