Question

Classify each substance as an element, a compound, a homogeneous mixture, or a heterogeneous mixture. Convert 7.93 times 10^-3 m to the equivalent length in nanometers

Answer 1

This is an incomplete question. The complete image is attached below:

Answer:

a) Element is a pure substance which is composed of atoms of similar elements.It can not be decomposed into simpler constituents using chemical reactions.Example: helium

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example: water

Heterogeneous mixtures  : It is a mixture that has non-uniform composition throughout the solution and the particle size or shapes are also different. There is a physical boundary between the dispersed phase and dispersion medium. Example: Air

Homogeneous mixtures  : It is a mixture that has uniform composition throughout the solution and the particle size or shapes are not different.There is no physical boundary between the dispersed phase and dispersion medium. Example: salt in water

b) $7.93\times 10^{-3}m$ =? nm

$1m=10^9nm$

$7.93\times 10^{-3}m=\frac{10^9}{1}\times 7.93\times 10^{-3}nm=7.93\times 10^{-6}nm$

Thus $7.93\times 10^{-3}m=7.93\times 10{-6}nm$

Answer 2

Part-A

Lets discuss each substance one by one:

1. Element:

It is a pure substance consisting only of atoms that all have the same numbers of protons in their nuclei.

2. Compound:

It is a chemical substance composed of many identical molecules composed of atoms from more than one element held together by chemical bonds.

3. Homogenous Mixture:

It is a mixture in which the composition is uniform throughout the mixture.

4. Heterogeneous Mixture:

It is a mixture in which the composition is not uniform throughout the mixture.

Part-B

We need to convert $7.93*10^{-3} m$ into $nm$:

$1m=10^{9}nm\\\\ 7.93*10^{-3}m= 7.93*10^{-3}m*10^9 nm\\\\ 7.93*10^{(-3+9)}nm\\\\ 7.93*10^{6}nm$

Learn more about compound here:  

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