CIE Chemistry Paper-1: Specimen Questions 31 - 32 of 99
Question number: 31
Give example of a gas in a liquid?
|d.||None of the above|
Gas in a liquid is a type of a mixture. A mixture is heterogeneous substances, ones with non-uniform composition throughout the sample.
A gas in a liquid implies a mixture which has a liquid and a gas within it. Soft drinks, such as cola, are mixtures of mainly carbon dioxide gas and water.
Question number: 32
Find correct statement regarding with elements and compounds:
An element is composed of a single kind of atom whereas A compound is composed of two or more elements in a
Elements are type of pure substance whereas compounds are type of mixtures.
The composition of elements varies and that of compound remains the same.
|d.||All of the above|
Elements and compounds both are type of Pure substances i. e. have a definite and constant composition. An element is composed of a single kind of atom. An atom is the smallest particle of an element that still has all the properties of the element. A compound is composed of two or more elements in a specific ratio. For example, water is a compound made up of two elements, hydrogen (H) and oxygen (O). These elements are combined in a very specific way — in a ratio of two hydrogen atoms to one oxygen atom, known as H2O.