Please enable JavaScript.
Coggle requires JavaScript to display documents.
C5: CHEMICAL CHANGES (Displacement Reactions (A more reactive metal will…
C5: CHEMICAL CHANGES
The Reactivity Series
-
Hydrogen gas is given off if metals react with water or dilute acids. The gas gives off a "squeaky pop" with a lighted splint
Displacement Reactions
-
The non-metals hydrogen and carbon can be given positions in the reactivity series on the basis of displacement reactions
-
-
-
A half equation is like an ionic equation, but it shows what happens to each reactant in the reaction (eg. Fe --> Fe2+ +2e-)
Extracting Metals
-
-
-
Metals more reactive than carbon cannot be extracted from their ores using carbon, but rather through the electrolysis of the molten metal compound/an aqueous version of the compound
Salts From Metals
A salt is a compound formed when the hydrogen in an acid is wholly or partially replaced by ammonium ions
Salts can be made by reacting a suitable metal with an acid. The metal must be above hydrogen in the reactivity series, but not dangerously reactive
The reaction between a metal and an acid produces hydrogen gas as well as a salt. A sample of the salt made can then be crystallized out of solution by evaporating off the water
-
-
-
Making More Salts
-
-
The titration can be repeated without the indicator to make a salt, then a pure, dry sample of its crystals prepared
-
-
Strong and Weak Acids
Aqueous solutions of weak acids such as carboxylic acids, have a higher pH value than solutions of strong acids with the same concentration
As the pH decreases by one unit, the hydrogen ion concentration reduces by a factor of 10 (ie. pH x 10 (to the power of)
-
-
Concentration refers to the relative amount of a particular substance contained within a solution or mixture
The more dilute a solution or mixture is, the less particles there are in it
The more concentrated a solution or mixture is, theless particles there are in it
-