iGCSE Chemistry: Equilibria (Double)
Terms in this set (13)
Gas particles move at a speed of several hundred metres per second at room temperature. Explain why gases take several minutes to diffuse across a room
Gas particles collide with air particles and move in random directions
State and explain how increasing temperature affects the diffusion of a gas
Gas diffuses quicker because particles have more energy.
What name is given to the movement of gases?
State the expression for calculating % yield.
% yield = (actual amount of products/theoretical amount of products) x 100
Describe the chemical test for water
Add it to anhydrous copper(II) sulfate which will change from white to blue if water is present
What is meant by the term endothermic?
A reaction in which heat energy is taken in (surroundings get colder)
What is meant by the term exothermic?
A reaction in which heat energy is given out (surroundings get hotter)
Explain why experimental values of enthalpy change differ from theoretical values
Heat energy is lost to the surroundings. Not all the reactants are used up.
Explain the effects of increasing the concentration of solutions on the rate of a reaction in terms of particle collision theory
1) more particles in same space 2) more frequent collisions 3) increase rate of reaction
What is a catalyst?
A substance that speeds up a chemical reaction but is chemically unchanged at the end of the reaction
What does the symbol ⇌ mean?
State the observation in the reaction between HCl(g) and NH₃(g)
White solid formed
The addition of water to anhydrous copper sulfate can be used to test for the presence of water. The reaction is reversible. What is the word equation? Describe the colour change.
anhydrous copper sulfate (white) + water ⇌ hydrated copper sulfate (blue)
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iGCSE Chemistry: Key Calculations (Triple)
iGCSE Chemistry: Equilibria (Triple)