This question is about the reactivity of metals and tests for ions.
A student adds a sample of four different metals, P, Q, R, and S, separately to water and to dilute hydrochloric acid.
The table shows the observations in each experiment.
| Metal | Observation with water | Observation with dilute hydrochloric acid |
|---|---|---|
| P | no change | bubbles form slowly |
| Q | bubbles form quickly | bubbles form extremely rapidly |
| R | no change | no change |
| S | bubbles form slowly | bubbles form quickly |
State two properties of the metal samples that the student should keep the same in all of the experiments in order to compare their reactivity.
Which of the metals is the most reactive?
Which gas is produced during the reactions of these metals with dilute hydrochloric acid?
The student carries out a test to show that the solution formed when metal S reacts with dilute sulfuric acid contains sulfate ions.
Use words or phrases from the list below to complete the sentence about this test. Each option may be used once, more than once, or not at all.
"He adds a ____________________ and observes the formation of a ____________________."
The student observes a lilac colour in a flame test on a small sample of a different metal compound.
Which metal ions cause the formation of this colour?
