Question

1.explain why air is considered a mixture and not a compound?

2. explain why water is a compound and not a mixture?

3.classify the following into elements,compounds,mixture
sodium, soil, sugar solution ,silver ,calcium
carbonate ,tin ,silicon ,coal ,air, soap ,methane ,carbon dioxide ,blood.

4.differentiate between homogeneous mixtures and heterogeneous mixtures with an example

Answer 1

Answer:

ANS.1 Air is a mixture and not a compound because: Air does not have a formula like a mixture, while compounds have a fixed formula. When air is formed by gases, there is no energy change. ... Components of air can be physically separated.

ANS.2 So, from the above discussed definitions, it is clear that the water is a compound and not a mixture because it is made up of only one kind of element i.e. oxygen and hydrogen atoms and hence, is a diatomic molecule. Note: Don't get confused in the molecules and compounds.

ANS.4 a. HOMOGENEOUS MIXTURE

These are the types of mixtures in which the components mixed are uniformly distributed throughout the mixture. In other words, “they are uniform throughout”. We can observe only one phase of matter in a homogeneous mixture. Key points regarding such mixtures are:

Particles are distributed uniformly

We can’t judge a homogeneous mixture by just seeing it

Homogeneous mixtures are also called solutions

Uniform composition

Example: rainwater, vinegar, etc.

B.heterogeneous mixtures

This is a type of mixture in which all the components are completely mixed and all the particles can be seen under a microscope. We can easily identify the components and more than one phase can be seen by naked eyes.

Key points regarding this type of mixture:

Particles are distributed non uniformly

We can judge a heterogeneous mixture by just seeing it

Non-uniform composition

Example: seawater, pizza, etc.

Hey dear sorry 3rd nhi pata jee