CHEMICAL NAMES OF CHEMICAL FOR 7th class
Answers
Answered by
1
Atom
Molecules
1. Atom is the smallest unit of matter.
1. Two or more atoms that chemically bound together forms a molecule.
2. It is impossible to break down atoms further.
1. Molecules can be subdivided to individual atoms.
3. For example, Atoms of element gold cannot be broken down.
3. For example, When two atoms oxygen combine to form a molecule, it becomes oxygen.
Question: Difference between Compound and Elements; Compounds and mixtures.
Answer: The difference is as follows:
Compound and Mixtures
Compound
Mixtures
1. Substances in which two or more elements are combined together chemically indefinite proportion, they are called Compound.
1. Substances in which two or more substances that are mixed together physically in no definite Proportion, they are called Mixtures.
2. Two atoms of hydrogen and one atom of oxygen makes water.
2. Sugar solution (water and sugar) is the example of mixture.
Compound and Element
Compound
Element
1. A substance formed by the chemical combinations of two or more elements in fixed proportion.
1. A substance that cannot be decomposed into simpler substances by chemical means.
2. The smallest particle of a compound is a molecule.
2. Element is made up of only one kind of atom.
3. For example, Water is a compound made up of hydrogen and oxygen.
3. Iron, gold, hydrogen and oxygen are some of the elements.
Question: Difference between Chemical and Physical Change.
Answer: The difference is as follows:
Chemical Change
Physical Change
1. A new substance is formed.
1. No new substance is formed.
2. It is a permanent change.
2. It is a temporary change.
3. The composition of new substance changes.
3. No change in the composition of change takes place.
4. It is irreversible.
4. It is reversible.
5. Heat or light evolved or absorbed during change.
5. No heat or light evolved or abso
Molecules
1. Atom is the smallest unit of matter.
1. Two or more atoms that chemically bound together forms a molecule.
2. It is impossible to break down atoms further.
1. Molecules can be subdivided to individual atoms.
3. For example, Atoms of element gold cannot be broken down.
3. For example, When two atoms oxygen combine to form a molecule, it becomes oxygen.
Question: Difference between Compound and Elements; Compounds and mixtures.
Answer: The difference is as follows:
Compound and Mixtures
Compound
Mixtures
1. Substances in which two or more elements are combined together chemically indefinite proportion, they are called Compound.
1. Substances in which two or more substances that are mixed together physically in no definite Proportion, they are called Mixtures.
2. Two atoms of hydrogen and one atom of oxygen makes water.
2. Sugar solution (water and sugar) is the example of mixture.
Compound and Element
Compound
Element
1. A substance formed by the chemical combinations of two or more elements in fixed proportion.
1. A substance that cannot be decomposed into simpler substances by chemical means.
2. The smallest particle of a compound is a molecule.
2. Element is made up of only one kind of atom.
3. For example, Water is a compound made up of hydrogen and oxygen.
3. Iron, gold, hydrogen and oxygen are some of the elements.
Question: Difference between Chemical and Physical Change.
Answer: The difference is as follows:
Chemical Change
Physical Change
1. A new substance is formed.
1. No new substance is formed.
2. It is a permanent change.
2. It is a temporary change.
3. The composition of new substance changes.
3. No change in the composition of change takes place.
4. It is irreversible.
4. It is reversible.
5. Heat or light evolved or absorbed during change.
5. No heat or light evolved or abso
Answered by
6
- hydrocarbon acid
- sulphuric acid
- acetic acid
- nitric acid
- calcium carbonate
- oxalic acid
- lactic acid
- malic acid
- potassium hydroxide
etc
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