MEDIUM
MYP:4-5
IMPORTANT
Earn 100

Johann Dobereiner's law of triads: Although this did not include many elements, it suggested an important link between atomic weight and what other factor? Why was it an important step forward in our understanding?

Important Questions on Evidence

MEDIUM
MYP:4-5
IMPORTANT
MYP Chemistry A concept-based approach Years 4&5>Chapter 2 - Evidence>Critical thinking skills>Q ●
John Newlands' law of octaves: This proposed that elements displayed periodicity or repeating patterns. What was the significance of this?
MEDIUM
MYP:4-5
IMPORTANT
MYP Chemistry A concept-based approach Years 4&5>Chapter 2 - Evidence>Critical thinking skills>Q ●
Dmitri Mendeleev's periodic table: Mendeleev left gaps for elements that had not yet been discovered. He predicted their properties and placed them in his periodic table where he thought they should be. How successful were his predictions? 
MEDIUM
MYP:4-5
IMPORTANT
MYP Chemistry A concept-based approach Years 4&5>Chapter 2 - Evidence>Critical thinking skills>Q ●
Henry Moseley's modern periodic table: How did Moseley's approach differ from that of Mendeleev? 
MEDIUM
MYP:4-5
IMPORTANT
MYP Chemistry A concept-based approach Years 4&5>Chapter 2 - Evidence>Experiment>Q 1
List three observations when sodium and potassium metal are dropped into water. 
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.