Chemistry 5070/41 — October/November 2010
Cambridge O-Level · Alternative to Practical · worked solutions for every part, with the mark scheme
Topics Experimental Contexts · Observations and Measurements · Analysis, Conclusions and Evaluation · Qualitative Analysis · Use of Techniques, Apparatus and Materials · Planning Experiments and Investigations
A beaker was half-filled with water and a clean piece of sodium was carefully added.
The diagrams below show parts of the thermometer stem giving the temperature of the water both before and after the addition of sodium.
Complete the following table and calculate the rise in temperature.
| final temperature of the water / | |
|---|---|
| initial temperature of the water / | |
| rise in temperature / |
What type of reaction does this temperature change indicate?
______
A gas was produced in the reaction.
Name and describe a positive test for this gas.
name ______
test ______
Name the resulting solution after the sodium had reacted with the water.
______
A few drops of litmus solution were added to the solution.
What was the colour of the resulting solution?
______
State two other observations that can be made when sodium reacts with water.
- ______
- ______
The rest of this paper
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