Topic 0- Metals Flashcards
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
what are positively charged ions called?
cations
what are negatively charged ions called?
anions
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.
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.
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
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.
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
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
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.
