Starter: These are the definitions

1
Starter These are the definitions but what are
the key words?

1. A new substance is made and it is difficult to
   reverse.
2. No new substance is made and it is easy to
   reverse.
3. Gives out energy.
4. Takes in energy.

2
Objectives

• To develop scientific vocabulary.
• To recognise exothermic or endothermic change.
• To use data loggers.

3
Classify these changes
4
Set up the data logger

• Log onto the computer.
• Take a temperature probe and put it into the USB
  drive.
• Start, programmes, Vernier Software, LoggerPro
  3.4.2.

5
The reactions

• Take a beaker of ice.
• Put the probe into the ice.
• Start collecting the data.
• Add salt to the ice and stir.
• Observe for 1 minute.
• Stop collecting the data and autoscale.
• Print your graph.

• Measure 30cm3 of HCl into a beaker.
• Add a little squirt of UI soln.
• Put the probe into the liquid.
• Start collecting the data.
• Add NaOH slowly until you have added 35ml.
• Stop collecting the data and autoscale.
• Print your graph.

6
The reactions

• Measure 25cm3 of copper sulphate into a beaker.
• Put the probe into the liquid.
• Start collecting the data.
• Add a spatula of zinc powder and stir.
• Observe for 1 minute.
• Stop collecting the data and autoscale.
• Print your graph.

• Half fill a beaker with water.
• Put the probe into the water.
• Start collecting the data.
• Add three spatulas of potassium nitrate.
• Observe for 1 minute.
• Stop collecting the data and autoscale.
• Print your graph.

7
Classify the reactions

• On each graph state whether it is a chemical or
  physical change and if it is exothermic or
  endothermic.
• Can you name the reactions?

8
Which of the following is a chemical changes?
9
How can you tell that a chemical change has
happened?
A new substance is made
A change of state happens
10
Which of the following is an exothermic change?
Combustion Ice melting
11
Which of the following is an endothermic change?
Combustion Ice melting
12
Well done!
13
Try again!