Atoms And Molecules: Mass, Models And Applications

Calculate masses and connect models to real substances

ScienceGrade 9Mixed10 questions20 min

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Focus question style

Section A: Core Ideas · 5 questionsSection B: Application Practice · 5 questions

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Section A: Core Ideas

Practise the first group of related skills.

Choose the best answer for each question.

Question 1

EasyQuestion

Which statement correctly distinguishes molecular mass from formula unit mass?

Topic: Molecular and Formula Mass · Skill: Differentiate molecular mass and formula unit mass

Question 2

MediumQuestion

Calculate the molecular mass of water, $H_2O$ . Given $H=1$ , $O=16$ .

Topic: Molecular and Formula Mass · Skill: Calculate molecular mass

Question 3

MediumQuestion

Calculate the formula unit mass of sodium chloride, $NaCl$ . Given $Na=23$ , $Cl=35.5$ .

Topic: Molecular and Formula Mass · Skill: Calculate formula unit mass

Question 4

AdvancedQuestion

In an electron dot structure of chlorine, how many valence electrons are shown around one chlorine atom?

Topic: [Formative] Atoms Molecules Applications · Skill: Draw electron dot structures

Question 5

MediumQuestion

A ball-and-stick model of $CO_2$ should show?

Topic: [Formative] Atoms Molecules Applications · Skill: Construct compound models

What this assignment covers

Strengthen molecular mass, formula unit mass, electron-dot structures and compound models.

Skills and sections

Differentiate molecular mass and formula unit mass, Calculate molecular mass, Calculate formula unit mass, Draw electron dot structures, Construct compound models

Section A: Core Ideas: 5 questions
Section B: Application Practice: 5 questions