Question

6. SShort answer questions.
1. What is an atom?
2. Mention important characteristics of a pure substance.
3. Write names and symbols of any five metals and five non-metals.
4. write down the chemical formulae of the following compounds:
b. Zinc oxide
a. Water
d. Magnesium oxide
f. Lead sulphide
h. copper oxide
c. Zinc sulphide
Calcium oxide
g. Nitrogen dioxide
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Answer 1

Answer:

An atom is a particle of matter that uniquely defines achemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons. Each electron is negatively charged. The nucleus is positively charged, and contains one or more relatively heavy particles known as protons and neutrons.

( sorry I only know this answer and I'm in 8 grade)

Answer 2

1. An atom is a smallest part of an element.

2. A pure substance cannot be split into simpler substances by physical means (sorry I only know one)

3. Magnesium, aluminium, Iron, gold and tin (metals). carbon, bromine, Sulphur, phosphorus and graphite (non-metals)

4. (The alphabets were messed up so fixed it for u)

a)Zno

b)h2o

c)mgo

d)pbs

e)cuo

f)zns

g)cao

e)no2

hope this helps