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प्रश्न
Differentiate between an atom and a molecule.
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उत्तर
| Atom | Molecule | ||
| 1. | Atoms are described as the smallest particles of an element that do not exist freely in nature but participate directly in chemical reactions. | 1. | A molecule consists of bound atoms that exist freely in nature but do not directly participate in chemical combinations. |
| 2. | The symbol of an element represents its atom. For example, the symbol H represents a hydrogen atom. | 2. | The molecular formula represents any substance's molecule. For example, the oxygen molecule is represented as O2. |
| 3. | An atom is made up of subatomic particles i.e., electrons, protons, and neutrons. | 3. | Molecules are made up of two or more atoms, which either be from the same or different elements. |
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संबंधित प्रश्न
Which of the following materials fall in the category of a “pure substance”?
- Ice
- Milk
- Iron
- Hydrochloric Acid
- Calcium oxide
- Mercury
- Brick
- Wood
- Air
What is the scientific name of particles which make up mater?
Which of the following is a mixture ?
Salt, Air, Water, Alum, Sugar
Name a metal which is soft and a non-metal which is hard.
Classify the following into elements and compounds :
- H2O
- He
- Cl2
- CO
- Co
Which of the following substances are elements ?
Water, Salt, Mercury, Iron, Marble, Diamond, Wood, Nitrogen, Air, Graphite, Hydrogen, Oxygen, Sugar, Chlorine
The elements which normally exist in the liquid state are :
Which of the following statements are true for pure substances ?
- pure substances contain only one kind of particles
- pure substances may be compounds or mixtures
- pure substances have the same composition throughout
- pure substances can be exemplified by all elements other than nickel
There is a large group of materials P which can be divided into three groups Q, R and S on the basis of their properties. The substances belonging to group Q can be solids, liquids or gases. The solids belonging to group Q are usually electrical insulators. Most of the substances of group R are solids which are good conductors of electricity. The substances belonging to group S are neither insulators like Q nor good conductors like R. The properties of S are intermediate between those of Q and R.
- What could the group of materials P be ?
- Name the substances Q. Give two examples of such substances.
- Name the substances R. Write two examples of such substances.
- Name the substances S. Give two examples of such substances.
- Out of Q, R and S, which substances are malleable and ductile ?
State whether colloidal solutions are homogeneous or heterogeneous.
How will you differentiate between a suspension and a colloid ?
What is meant by a solution?
Differentiate between a saturated and an unsaturated solution. How will you test whether a given solution is saturated or not ?
Which one of the following is not a chemical change ?
Name the process you would use to separate a mixture of water and alcohol.
Asmita went to buy an earthen pot. There she saw many things kept for sale.
What is the difference between a substance and an object?
The phenomenon of Evaporation takes place at the ______ of a liquid.
Examples of foam are ______.
Define the term matter.
