Form 5 homework – Week 2

For each question please give reasons + show your working if necessary.

Day 1  Day 2  Day 3  Day 4  Day 5  Day 6

Day 1

Question 1

Rubidium and strontium are both in Period 5 of the Period Table.

Rubidium is in Group I. Strontium is in Group II.

Which statement about these elements is correct?

  • Each statement about these elements is correct?

  • The atomic number of rubidium is greater than the atomic number of strontium.

  • Rubidium form the Rb+​​ ion; strontium forms the Sr2+​​ ion.

  • They both react with oxygen to form basic oxides.

Question 2

A new element oxfordium, Ox, was discovered with he following properties.

A white rectangular box with black text AI-generated content may be incorrect.

In which group of the periodic table should the new element be placed?

  • Group III

  • Group V

  • Group VII

  • Group VIII

Day 2

Question 1

The diagram shows a simplified form of the Periodic Table:

A grid of squares with a square in the middle AI-generated content may be incorrect.

Which elements will form an acidic oxide?

  • W and Z

  • W only

  • X and Y only

  • Y only

Question 2

Element X is in Group I of the periodic table.

Which row shows the type of oxide and whether element X is metallic or non-metallic?

A group of black text AI-generated content may be incorrect.

Day 3

Question 1

Which row describes the properties of potassium bromide?

A white rectangular box with black text AI-generated content may be incorrect.

Question 2

Which statement about ions and ionic bonds is correct?

  • Bromine atoms form negatively charged bromide ions.

  • Ionic bonds form between elements in Group VII of the periodic table.

  • Positive ions are formed when atoms lose protons.

  • Potassium iodide contains negatively charged potassium ions.

Day 4

Question 1

Which molecule has only two shared pairs of electrons?

  • CH4

  • Cl2

  • HCl

  • H2O

Question 2

A covalent molecule M contains a total of four shared electrons.

What is M?

  • Ammonia, NH3

  • Hydrogen chloride, HCl

  • Methane, CH4

  • Water, H2O

Day 5

Question 1

Which statement about a solid, a liquid or a gas is correct?

  • A solid has a fixed shape and can be compressed.

  • A liquid takes the shape of the container it is in and can be compressed.

  • A solid has no fixed shape and cannot be compressed.

  • A gas takes the shape of the container it is in and can be compressed.

Question 2

The melting points and boiling points of three elements, at 1 atm pressure, are shown.

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Separate samples of argon, nitrogen and oxygen are stored at -200​​ oC and at 1 atm pressure.

How many samples are liquid?

  • 0

  • 1

  • 2

  • 3

Day 6

Question​​ 1

Solid X is heated for 600 seconds.

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The graph shows the heating curve that is obtained.

What is the melting point of X?

  • 20​​ oC

  • 170​​ oC

  • 240​​ oC

  • 270​​ oC

Question 2

The diagram shows the changes of state between a solid, a liquid and a gas.

In which changes of state is energy being given out?

  • 1 and 2

  • 1 and 4

  • 2 and 3

  • 3 and 4