Chemistry Year 10/2
Using collision theory, explain how temperature makes the reaction go faster?
Increasing the temperature increases the collision frequency. Particles can only react when they collide. If you heat a substance, the particles move faster and so collide more frequently. That will speed up the rate of reaction.
State the names of the following ionic compounds? MgO AGCl Pbl2 BaSO4
Magnesium Oxide Silver Chloride Lead (II) iodide Barium sulphate
State the chemical formula for the following ionic compounds? Sodium hydroxide Calcium sulfate Silver nitrate Magnesium chloride
NaOH CaSO4 AgNO3 MgCl2
When a few drops of colourless sodium hydroxide is added to a blue solution of copper sulphate a light blue solid of copper sulphate is produced and a colourless sodium sulfate Write the word equation
Sodium hydroxide + copper sulphate > copper hydroxide + sodium sulfate
State which side of a reaction the reactants are written on?
The left hand side of the equation arrow.
Write the word equation
barium chloride + sodium sulfate ==> barium sulfate + sodium chloride
When a colourless solution of barium chloride is mixed with a colourless solution of sodium sulphate a white solid of barium sulphate forms along with a colourless solution of sodium chloride. State the reactants: State the products:
barium chloride and sodium sulphate barium sulfate and sodium chloride
STate what particles must do for a reaction to occur?
For a chemical reaction to occur, the reactant particles must collide with each other.
Write the symbolic equation and have a go at balancing
2NaOH + CuSO4 = Na2SO4 + Cu(OH)2
Balance the equation
Ba(2+) + 2Cl(-) and 2 Na(+) + SO4(2-) BaCl2 + Na2SO4 ---> BaSO4 + 2 NaCl
Write the symbolic equation
BaCl2(aq) + Na2SO4(aq) ==> BaSO4(s) + 2NaCl(aq)
Using collision theory, explain how concentration makes the reaction go faster?
Cases where changing the concentration affects the rate of the reaction This is the common case, and is easily explained. Collisions involving two particles The same argument applies whether the reaction involves collision between two different particles or two of the same particle. In order for any reaction to happen, those particles must first collide. This is true whether both particles are in solution, or whether one is in solution and the other a solid. If the concentration is higher, the chances of collision are greater.
State the factors that can change the rate of a chemical reaction?
Factors that influence the reaction rates of chemical reactions include the concentration of reactants, temperature, the physical state of reactants and their dispersion, the solvent, and the presence of a catalyst.
State which side of a reaction the products are written on?
On the right hand side of the equation arrow.
Potassium chloride KCl has 1 potassium ion in its formula whereas potassium oxide K2O has 2. Explain why these two have a different number of potassium ions. Include The charge on the ions involved The overall charge on molecules An explanation for why the formula are different
Potassium chloride is KCl because K forms +1 ions and Cl forms -1 ions. (Why is THAT? Well, that's a separate Since the charges are equal and opposite, you need equal numbers of each ion for the charges to balance each other out, thus making the overall compound electrically neutral, as all compounds must be. With potassium oxide, however, you still have +1 K ions -- BUT, the oxide (from the word "oxygen") ions each have a -2 charge. Thus, for every -2 oxide ion, you need TWO +1 potassium ions, so that the total charge from those two K ions will be (2)(+1) = +2. +2 is, of course, what you need to electrically balance the -2 charge from each individual oxide ion. Because the number of potassium ions required to accomplish this is twice the number of oxide ions, we write the formula K2O.
