MEDIUM
MYP:4-5
IMPORTANT
Earn 100

List three observations when sodium and potassium metal are dropped into water. 

Important Questions on Evidence

MEDIUM
MYP:4-5
IMPORTANT
MYP Chemistry A concept-based approach Years 4&5>Chapter 2 - Evidence>Experiment>Q 2
Sodium and potassium react vigorously with water and disappears when they are dropped in water. What flame colour did you observe from each reacting metal?
MEDIUM
MYP:4-5
IMPORTANT
MYP Chemistry A concept-based approach Years 4&5>Chapter 2 - Evidence>Experiment>Q 3
What did you notice about the level of reactivity of sodium compared to potassium when they are dropped in water?
HARD
MYP:4-5
IMPORTANT
MYP Chemistry A concept-based approach Years 4&5>Chapter 2 - Evidence>Experiment>Q 4
Recall the reaction of the metals such as potassium and sodium with water. What does the colour of the universal indicator tell you about the initial and final pH of the water solution? Estimate the pH of the resulting solution.
EASY
MYP:4-5
IMPORTANT
MYP Chemistry A concept-based approach Years 4&5>Chapter 2 - Evidence>Experiment>Q 5
Write the word equations to describe the reactions of sodium and potassium with water.
MEDIUM
MYP:4-5
IMPORTANT
MYP Chemistry A concept-based approach Years 4&5>Chapter 2 - Evidence>Experiment>Q 6
Write and balance the chemical equations for both the reactions of potassium and sodium with water.
HARD
MYP:4-5
IMPORTANT
MYP Chemistry A concept-based approach Years 4&5>Chapter 2 - Evidence>Experiment>Q 7
Consider some typical metals and their physical and chemical characteristics. For example, a lead fishing sinker is denser than water and sinks to the bottom of the lake; an iron nail corrodes in air, but very slowly. Consider what happens if you drop a piece of copper, aluminium or iron into water. Describe how the behaviour of the alkali metals are different from other metals.
HARD
MYP:4-5
IMPORTANT
MYP Chemistry A concept-based approach Years 4&5>Chapter 2 - Evidence>Changing oxidation states of vanadium>Q 1

Recall the changing oxidation states of vanadium during a chemical reaction (You can use Internet for finding a good demonstration). Using that, answer the following questions:

1. Describe your observations.

2. What evidence did you observe to suggest chemical reactions were occurring?

3. How many oxidation states of vanadium were formed?

4. List the oxidation states and their colours.

MEDIUM
MYP:4-5
IMPORTANT
MYP Chemistry A concept-based approach Years 4&5>Chapter 2 - Evidence>Changing oxidation states of vanadium>Q 5
Suggest how the characteristic colours of transition metal compounds can be helpful when performing investigations.