Chemistry Chapter 7 and 8

What type of reaction which taken short time to reaction to complete

• Fast reaction

• Slow reaction

Choose which one is slow reaction

• Fermentation

• Precipitation

• Neutralisation

What is the colour of lead(II) iodide precipitate

• Yellow

• White

• Black

Which factor will make the reaction become faster

• Bigger size of solid reactant

• Smaller size of solid reactant

Why the concentration of reactant affect the rate of reaction?

• Less number of particles per unit volume

• Higher frequency of collisions between particles

Which reaction will increase energy level of product compare to the energy level of reactant

• Exothermic reaction

• Endothermic reaction

What is the meant by rate of reaction based on the decomposition of hydrogen peroxide?

• Decrease in the volume of hydrogen peroxide per time

• Decrease in the concentration of hydrogen peroxide per time

The higher the temperature of a reactant, the higher the rate of reaction. Which statement can explain why the rate of reaction is higher?

• The reaction particles have bigger total surface area

• The reacting particles have higher kinetic energy

What is alloy

• Mixture of two or more elements in a fixed composition with its main component is a metal

• Mixture of non metal and non metal in a fixed composition

Which alloy compose of 90%copper and 10‰ tin

• Bronze

• Brass