Question

4. Water is a compound made up of hydrogen and oxygen gas.
5. Constituents of a mixture are present in a fixed proportion.
6. In a homogeneous mixture, constituents are uniformly mixed throughout the mixture.
7. Air is a heterogeneous mixture.
Elements, Compounds and Mix​

Answer 1

Answer:

it may be give reason

Explanation:

1. yes water is a compound made up of 2 molecules of hydrogen and one molecules of oxygen that make one unit of water
2. no it may be differ
3. yes it may or may not
4. no in heterogenous mixture their particles can be visible by naked eyes

Answer 2

Answer:

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Explanation:

4Ans)When molecular hydrogen (H2) and oxygen (O2) are combined and allowed to react together, energy is released and the molecules of hydrogen and oxygen can combine to form either water or hydrogen peroxide. These two processes are represented by the two chemical equations shown at right

5Ans)Mixtures are heterogeneous forms of matter. Mixtures are composed of variable proportions of molecules and atoms. Compounds are homogeneous forms of matter. Their constituent elements (atoms and/or ions) are always present in fixed proportions (1:1 depicted here)

6Ans)Homogeneous Mixtures

A homogeneous mixture is a mixture in which the composition is uniform throughout the mixture. The salt water described above is homogeneous because the dissolved salt is evenly distributed throughout the entire salt water sample.

7Ans)Air is an homogeneous mixture of several gases.

Explanation:

The air we breathe is composed of varying elemental gases, mostly N2, and O2, and some inert gas elements in trace quantities. There are small (but increasing) concentrations of CO2, SO2, and nitrogen oxides.

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