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Chemistry_0620_1_OCT 2020

Authored by Hui sze Quah

Chemistry

9th Grade

Used 19+ times

Chemistry_0620_1_OCT 2020
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21 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

A mixture of ice and water is left to stand and the ice melts. Which row describes what happens as the ice is melting?

A

B

C

D

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

Which piece of apparatus is used to measure 25.0 cm3 of aqueous sodium hydroxide?

A

B

C

D

3.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Media Image

Paper chromatography is used to determine the Rf values for four different food colourings. Which food colouring has an Rf value of 0.6?

A

B

C

D

4.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Media Image

The diagram shows the electronic structure of a particle with a nucleon number (mass number) of 40. The table shows the suggestions that three students, 1, 2 and 3, made to identify the particle. Which students are correct?

1 and 2 only

1 and 3 only

2 and 3 only

1, 2 and 3

5.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Media Image

The electronic structures of two atoms, P and Q, are shown.

A

B

C

D

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which statement about the structure of a metal explains why metals are malleable?

The electrons can move freely throughout the lattice.

The layers of metal ions can slide over each other.

The metal ions are positively charged.

There is a strong force of attraction between the metal ions and the electrons.

7.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Media Image

The bonding, structure and melting point of sodium chloride and sulfur dichloride are shown. Why does sulfur dichloride have a lower melting point than sodium chloride?

The covalent bonds in sulfur dichloride are weaker than the attractive forces between molecules in sodium chloride.

The covalent bonds in sulfur dichloride are weaker than the ionic bonds in sodium chloride.

The attractive forces between molecules in sulfur dichloride are weaker than the attractive forces between molecules in sodium chloride.

The attractive forces between molecules in sulfur dichloride are weaker than the ionic bonds in sodium chloride.

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