Q1 Which of the following are not compounds?
(a) Chlorine gas
(b) Potassium chloride
(c) Iron
(d) Iron sulphide
(e) Aluminium
(f) Iodine
(g) Carbon
(h) Carbon monoxide
(i) Sulphur powder
Q2 Give three points of difference between elements and compounds.
Q3 Distinguish between compounds and mixture.
Answers
Answer:iron
Aluminum
Iodine
Carbon
Sulphur powder
Explanation:
⚀ Answer
All the given options are not compound.
Explanation:
- In general there are two types of substances they are: one is element and other is compound.
- Element is a pure substance. That means it consists of only one atom. They cannot be decomposed into other atoms.
- Elements are classified as metals, non- metals and semi metals. Compound atoms are the combination of two atoms.
- They can be split into different atoms by some external field.
- For example: water H2O Sodium chloride (salt) NaCl2 and calcium carbonate CaCO3 are the compounds where they can bge split into two different atoms.
⚁ Answer
Elements:
1) Composed from the same atom or molecule.
2)Every particle in an element has the same number of protons in the nucleus.
3.example- sodium..magnesium...carbon
Compounds:
1)Composed from two or more different types of atoms or molecules.
2)protons in the nucleus of that particularcompound are different.
3) example- sodium hydroxide.....calcium oxide..etc
⚂ Answer
Compounds
1. Compounds are pure substances.
2. They are made up of two or more elements combined chemically.
3. The constituents of a compound are present in a fixed ratio.
4. Compounds have fixed properties. For example, a particular compound will have fixed temperatures at which it melts and boils.
5. A compound can have properties different from its constituents, as a new substance is formed when the constituents are chemically combined.
6. The constituents of a compound can be separated only by chemical methods.
Mixtures
1. Mixtures are impure substances.
2. They are made up of two or more substances mixed physically.
3. The constituents of a mixture are present in varying ratios.
4. Mixtures do not have fixed properties. Their properties depend on the nature of their components and the ratios in which they are combined.
5. In mixtures, no new substance is formed. The properties of a mixture are the same as the properties of its constituents.
6. The constituents of a mixture can be separated easily by physical methods.