What is the order of decreasing reactivity of these four metals? Tick (✓) one box. Zn Ca Cu Mg Ca Cu Mg Zn Cu Zn Ca Mg Ca Mg Zn Cu A student wants to make a fair comparison of the reactivity of the metals with hydrochloric acid. Name two variables that must be kept constant. 1 2 What is the independent variable in this reaction? Predict the reactivity of beryllium compared with magnesium. Give a reason for your answer. Use the periodic table. A solution of hydrochloric acid contains 3.2 g of hydrogen chloride in 50 cm³. Calculate the concentration of hydrogen chloride in g per dm³. Concentration = ______ g per dm³.

GCSE AQA Chemistry Combined Science Measurement, Mass & Equations: What is the order of decreasing

What is the order of decreasing reactivity of these four metals? Tick (✓) one box - AQA - GCSE Chemistry Combined Science - Question 1 - 2019 - Paper 1

Question 1

What is the order of decreasing reactivity of these four metals? Tick (✓) one box. Zn Ca Cu Mg Ca Cu Mg Zn Cu Zn Ca Mg Ca Mg Zn Cu A student wants ... show full transcript

Worked Solution & Example Answer:What is the order of decreasing reactivity of these four metals? Tick (✓) one box - AQA - GCSE Chemistry Combined Science - Question 1 - 2019 - Paper 1

Step 1

What is the order of decreasing reactivity of these four metals?

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Answer

The correct order of decreasing reactivity is:

Calcium (Ca)
Magnesium (Mg)
Zinc (Zn)
Copper (Cu)

Thus, tick the box for: Ca, Mg, Zn, Cu.

Step 2

Name two variables that must be kept constant.

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Answer

Mass of the metal/element
Surface area of the metal/element

These controls are essential for ensuring a fair comparison when observing the reactivity.

Step 3

What is the independent variable in this reaction?

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Answer

The independent variable in this reaction is the type of metal/element being tested, as it is what is changed to observe its effect on reactivity.

Step 4

Predict the reactivity of beryllium compared with magnesium.

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Answer

Beryllium is less reactive than magnesium.

Reason: This is due to the increased attraction between its nucleus and outer electrons, making it harder to remove electrons compared to magnesium.

Step 5

Calculate the concentration of hydrogen chloride in g per dm³.

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Answer

To find the concentration in g per dm³, we use the formula:

$C = \frac{mass}{volume}$

Convert the volume from cm³ to dm³:
- 50 cm³ = 0.05 dm³
Calculate the concentration:
- $C = \frac{3.2 g}{0.05 dm³} = 64 g/dm³$

Thus, the concentration of hydrogen chloride is 64 g per dm³.

What is the order of decreasing reactivity of these four metals? Tick (✓) one box - AQA - GCSE Chemistry Combined Science - Question 1 - 2019 - Paper 1

Worked Solution & Example Answer:What is the order of decreasing reactivity of these four metals? Tick (✓) one box - AQA - GCSE Chemistry Combined Science - Question 1 - 2019 - Paper 1

What is the order of decreasing reactivity of these four metals?

Name two variables that must be kept constant.

What is the independent variable in this reaction?

Predict the reactivity of beryllium compared with magnesium.

Calculate the concentration of hydrogen chloride in g per dm³.

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