Chemistry
Grade-7
Easy
Question
Classify the following substances into the solid-solid, solid-liquid, and liquid-liquid mixtures.
(i). Soil
(ii). Seawater
(iii). Steel
(iv). Chocolates
(v). Water and kerosene
(vi). Almond oil in water
Hint:
D
The correct answer is:
- Soil is a mixture of several substances in varying amounts. As a result, soil is not a homogeneous mixture. It is, nevertheless, a heterogeneous solid-solid mixture.
- Sea water is a homogeneous blend of solids and liquids.
- Steel is the most widely used metal alloy in the planet. It is composed of iron and variable amounts of carbon, both of which are solids. Homogeneous mixtures are those that have the same composition throughout. As a result, because steel is uniform in composition, it is a homogeneous mixture of solids.
- Chocolate can be a solid, a liquid, or a paste, and it typically has some type of additional sweetener, such as sugar or condensed milk, in addition to cocoa powder and cocoa butter, to offset the bitter taste. Hence it is solid-liquid mixture.
- A liquid-liquid mixture is a form of mixture that only consists of liquid components. A mixture of oil and water, alcohol in water, and other liquid-liquid mixtures are examples of this type. As oil and water are both liquids; yet, it is an emulsion rather than a mixture because oil in water is not miscible and neither dissolves in the other.
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