IGCSE CHEM mid-term review

A compound has a melting point of 50 ^oC and a boiling point of 150 ^oC. Which two statements are correct？

• It is a liquid at 78 ^oC.

• It is a liquid at 160 ^oC.

• It is a gas at 160 ^oC.

• It is a solid at 60 ^oC.

Tags

NGSS.MS-PS1-4

Which statements describe the particle in a liquid?

• Particles are packed in a regular arrangement.

• Particles are randomly arranged.

• Particles move over each other.

• Particles vibrate about fixed points.

Tags

NGSS.MS-PS1-4

How many electrons are there in the outer electronic shell of chlorine?

• 5

• 6

• 7

• 8

How many electrons are there in the outer electronic shell of Kr?

• 5

• 6

• 7

• 8

What is the proton number of ¹⁹F ^- ion?

Tags

NGSS.MS-PS1-1

What is the electron number of ¹⁹F ^- ion?

Tags

NGSS.HS-PS1-1

What the formula of compound hydrated copper sulfate?

• CuSO₄

• CuSO₄. 5H₂O

• MgSO4

• MgSO₄.7H₂O

What is the correct formula of the compound formed from Al³⁺ and S^2-？

• Al₂S₃

• Al₃S₂

• AlS

• Al₂S

Which of the following substances has/have giant covalent structures?

• diamond

• graphite

• silicon dioxide

• carbon dioxide

Which is/are the properties of diamond?

• high melting point and boiling point

• extremely hard

• do not conduct electricity

• conduct electricity