A teacher shows a class the reactions of lithium, sodium and potassium with water.
The metals are stored under oil.
Explain why lithium, sodium and potassium are stored under oil.
The table shows the teacher's observations.
| Metal | Observations |
|---|---|
| lithium | floats, fizzes steadily and moves slowly on the surface |
| sodium | melts into a ball, fizzes quickly and moves quickly on the surface |
| potassium | melts, fizzes very quickly and burns with a lilac flame |
Put the three metals in order of reactivity.
Start with the most reactive.
Complete the word equation for the reaction of sodium with water.
sodium + water → ...... + hydrogen
The teacher adds universal indicator to the water after the reaction. The indicator turns purple.
What does this show about the solution?
Rubidium is below potassium in Group 1.
Predict how the reaction of rubidium with water compares with the reaction of potassium with water.
Lithium, sodium and potassium all react with water in a similar way.
Explain why. Use ideas about electrons.
Which two statements about Group 1 metals are correct?
Statement 1: They are soft and can be cut with a knife.
Statement 2: They are hard and have high melting points.
Statement 3: They form ions with a 1+ charge.
Statement 4: They form coloured compounds.
Statement 5: Their melting points increase down the group.
Write the numbers of the two correct statements.
60 exam-style questions on OCR GCSE Chemistry 4.1 Predicting chemical reactions, covering 4.1.1 Properties and trends in Groups 1, 7 and 0, 4.1.2 Properties of the transition metals, 4.1.3 Reactivity predicted from position in the Periodic Table, and 4.1.4 Reactivity of metals and the reactivity series. Each one has a worked solution and a mark scheme showing where the marks go.