Question

Matter may be classified as elements, compounds, or mixtures. Which of the following lists includes only mixtures?

1.dry ice, alcohol, brass

2.sea water, milk, air

3.copper, gasoline, bread

4.paint, blood, mercury






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Answer 1

Answer:

2. sea water, milk, air all of these are mixtures

Explanation:

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Answer 2

Answer:

Sea water, milk, air are mixtures.

Therefore , option (2) is correct.

Explanation:

• Element is any substance which cannot be further decomposed into simple parts by using ordinary chemical process.

• Compounds are substances which are formed by chemically bonding between two or more elements. Compounds are always homogeneous.
• Three types of compounds:- covalent compounds, ionic compounds and metallic compounds.
• Mixtures are obtained by physically mixing two or more substances.
• There are two types of mixtures:- homogenous mixtures and heterogeneous mixtures.

Dry ice, Alcohol, Brass :-

1. Dry ice - compound (solid carbon dioxide)
2. Alcohol - compound
3. Brass - mixture (alloy of zinc and copper)

Sea water, Milk, Air:-

1. Sea water- mixture (mixture of water and soluble salts )
2. Milk- mixture (fat, water and solids)
3. Air - mixture of many gases.

Copper, Gasoline, Bread:-

1. Copper - element
2. Gasoline - mixture (many hydrocarbons)
3. Bread- mixture

Paint, Blood, Mercury:-

1. Paint - mixture (pigments, solvents)
2. Blood - mixture (RBCs, WBCs, platelets)
3. Mercury - element

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