Elements Compounds and Mixtures

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Elements Compounds and Mixtures — Free MYP2 Sciences Practice Questions

1QuestionCompounds and Chemical FormulaeConcept Practice

2 marks~3 minCriterion A

The diagram below shows a model of a water molecule (

\text{H}_2\text{O}

). The two small circles represent atoms of one element, and the large circle represents an atom of a different element.

Identify the element represented by the small circles. [1]

Identify the element represented by the large circle. [1]

Solutions

2QuestionCompounds and Chemical FormulaeAssessment Practice

4 marks~6 minCriterion C

The diagram below shows a water molecule. One oxygen atom (

O

) sits in the centre, with two hydrogen atoms (

H

) attached on either side.

Identify the number of each type of atom shown in the diagram. [1]

Explain why the chemical formula for water is written as

H_2O

, using evidence from the diagram. [2]

Compare

H_2O

with

HO

and

H_2O_2

. Explain why neither alternative correctly represents the water molecule shown. [1]

Solutions

3QuestionDefinition of Elements and SymbolsAssessment Practice

5 marks~8 minCriterion B

The table below shows eight elements and their symbols.

Element: Hydrogen	Symbol: $H$
Element: Helium	Symbol: $He$
Element: Lithium	Symbol: $Li$
Element: Beryllium	Symbol: $Be$
Element: Boron	Symbol: $B$
Element: Carbon	Symbol: $C$
Element: Nitrogen	Symbol: $N$
Element: Oxygen	Symbol: $O$

Identify the pattern used to form these symbols from the element names. [1]

Using your pattern, predict the symbol for Fluorine and explain your reasoning. [2]

Sodium has the symbol

Na

, not

S

. Compare this with the pattern you identified and explain why the symbol differs. [2]

Solutions

4QuestionCompounds and Chemical FormulaeAssessment Practice

6 marks~9 minCriterion D

A student mixes baking soda (sodium hydrogen carbonate) and vinegar (ethanoic acid). The reaction is:

\mathrm{NaHCO_3 + CH_3COOH \rightarrow CH_3COONa + H_2O + CO_2}

Identify the chemical formula of baking soda and the chemical formula of vinegar. [2]

Explain why bubbles form when the two substances are mixed. [2]

The student plans to use the mixture to clean a greasy surface. Compare the cleaning effectiveness of this mixture with that of a commercial cleaner, giving one reason based on the reaction above. [2]

Solutions

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