What is the general name of the materials which contain at least two pure substances and show the properties of their constituents ?

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Solution

Mixtures show the properties of its constituents and are made up of two or more substances.

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Q. What are the materials which contain at least two pure substances and show the properties of their constituents called?

There are three substances X, Y and Z. The substance X does not have a fixed melting point or boiling point and it still shows the individual properties of its constituents. The substance Y is a pure substance which occurs in nature as such. The substance Y has a fixed melting point and boiling point but it cannot be broken down into simpler substances by any chemical means. The substance Z is also a pure substance whose properties are entirely different from those of its constituents. The substance Z can, however, be divided by electrolysis into two substances which belong to the same class of substances as Y.

(a) What type of substance could X be? Name one substance like X.

(b) What type of substance could Y be? Name one substance like Y.

(d) Which process involves absorption or release of an appreciable amount of energy: formation of substances X or formation of substance Z?

(e) Name the three groups into which all the substances like Y are divided on the basis of their properties.

Study the information given below:

1) Some substances are formed when two or more elements combined together chemically.
2) Properties of these substances are different from their respective constituents.
3) These substances cannot be broken down into their respective constituents by physical methods.

Which of the following substance has the properties listed above?

Q. 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 not good conductors like R. The properties of S are intermediate between those of Q and R.

(a) What could the group of materials P be ?
(b) Name the substances Q. Give two examples of such substances.
(c) Name the substances R. Write two examples of such substances.
(d) Name the substances S. Give two examples of such substances.
(e) Out of Q, R and S, which substances are malleable and ductile ?

Q. Assertion :Elements and compounds are the examples of pure substances. Reason: The properties of a compound are different from those of its constituent elements.

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