IGCSE Chemistry: Specimen Questions with Answers 231 - 234 of 240

The table shows some physical properties of the Group VII elements.

Suggest a value for the atomic radius of fluorine.

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Explanation

Atomic radius of fluorine is because it has electronegativity about .

Substances can be classified as:

Elements can be divided into:

Classify each of the following as either an element, compound or mixture.

brass . [1 Marks]

Explanation

Brass is a mixture of the elements of copper and zinc. Bronze is a mixture of copper and tin. Water is a compound of the elements hydrogen and oxygen.

Germanium is an element in Group IV. The electron distribution of a germanium atom is 2 + 8 + 18 + 4. It has oxidation states of + 2 and + 4.

Is the change to reduction, oxidation or neither? Give a reason for your choice.

Explanation

Change from to is oxidation number of it is .

Mustard Oil is an example of a/an ________.

Answer

Explanation

Mustard Oil is an example of a base. It doesn՚t taste sour. So, it is not an acid.