REVISIONC4 1st Half! (H)

An acid can be neutralised by adding a ______ or an ______ to it. An _______ is a soluble _______. An alkali can be neutralised by adding an ______ to it. (5)

ACID ALKALI BASE ALKALI BASE

How many elements and atoms are in this compound? (explain your answer)

CaCO3

What do we call solutions with a pH of less than 7, exactly 7, and more than 7

Complete the neutralisation equation

Base + _______ _______ + salt

A process has a predicted yield of 50 kg but only 12.5 kg is produced calculate the percentage yield. (explain your answer)

Percentage yield = actual yield x 100

Predicted yield

Calculate the formula mass of ammonia

N: 14 H:1

3NH

State two reasons fertilisers are put onto crops

What are the 3 main chemical elements that plants need? (3)

What must fertilisers do before they can be absorbed by plants

(2)

What are the two elements that ammonia is made from

Which acid and base are needed to make the following fertilisers;

ammonium sulphate and ammonium nitrate. (3)

List three factors that affect the cost of making a substance

Match these squares up

The higher the pressure

The higher the temperature

Using a catalyst Increases the plant cost

Increases the energy cost

Reduces the cost by increasing the reaction rate

What does this symbol mean?