Elements, Compounds and Mixtures Test - 4

Physical properties are those that can be observed or measured without changing the composition or identity of the substance. These properties include color, odor, taste, density, melting point, boiling point, conductivity, and hardness.

A mixture is defined as an impure substance made up of two or more types of elements (atoms) or compounds or both mechanically mixed in any proportion, and it can be further subdivided into simpler substances by physical (mechanical) means.

Sodium is an element that is a member of the alkali metal group with a symbol Na. It is physically silver colored and is a soft metal of low density. When an element is oxidized to its most common oxide and dissolved in water the solution will be either acidic or basic.

Sodium is an element that is a member of the alkali metal group with a symbol Na. It is physically silver colored and is a soft metal of low density. When an element is oxidized to its most common oxide and dissolved in water the solution will be either acidic or basic.

An impure substance is one which is a mixture of two or more kinds of molecules and has no definite composition and properties. for example, air,soil, atones and pebbles in food grains,sugar in water,sand in water,fruit juice etc.

The particles of rubber band are loosely bounded by force of attraction, so as we stretch it moves to maximum elastic limit and as soon as it is released it regains its shape, therefore, it has some property of solids.

The kinetic energy of particles is maximum in gas as the particles are free to roam with maximum speed as there is negligible force of attraction between the particle.

A pure substance has a constant composition and cannot be separated into simpler substances by physical means. There are two types of pure substances: elements and compounds. Elements: are pure substances made up of only l type of atom. Atoms of the same element are identical in properties.

A pure substance that has only one kind of atom and cannot be broken into two or more simpler substances by physical or chemical means is an element.

The three states of matter are classified on the basis of differences of certain physical properties such as physical existence; solids are physically hard, they have fixed shape and size. Liquids do not have any fixed shape and size, they changed according to the shape of beakers in which they are placed. Gases do not have a fixed shape or volume.