1】 What do you mean by a reversible
change ?
2】What do you mean by a irreversible change
3】 What are physical change? give 2 examples ?
4】what are chemical change ? give two examples ?
5】 Describe an irreversible change that you about
by hitting?
6】 Describe an reversible change that you about by hitting?
7】Mention 2 change that you can be bought about by applying pressures?
Answers
Answer:
(1)change which can happen backward, that is, can be reversed is called a reversible change. If you keep water in the freezer for some time, it transforms into ice. But as soon as you take it out of the freezer, it turns into water again. This is a reversible change.
(2)A reversible change is a change that can be undone or reversed. If you can get back the substances you started the reaction with, that's a reversible reaction. ... Examples of reversible reactions include dissolving, evaporation, melting and freezing.
(3)physical change involves a change in physical properties. Examples of physical properties include melting, transition to a gas, change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume and density.
(4)Rotting, burning, cooking, and rusting are all further types of chemical changes because they produce substances that are entirely new chemical compounds. For example, burned wood becomes ash, carbon dioxide, and water.
(6)when you burn a paper by heating it vhanges into ash,which cannot be converted back to paper, which is irriversible change.
(7). intermolecular force of attraction increases as the particles come closer to each other on applying pressure. . thermal agitation decreases as the particles lose their ability to repel each other.
Answer:
(a)A reversible change is a change that can be undone or reversed.
If you can get back the substances you started the reaction with, that's a reversible reaction.
A reversible change might change how a material looks or feels, but it doesn't create new materials.
Examples of reversible reactions include dissolving, evaporation, melting and freezing.
(b)A change is called irreversible if it cannot be changed back again.
(c) physical change involves a change in physical properties. Examples of physical properties include melting, transition to a gas, change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume and density.
An example of a physical change is the process of tempering steel to form a knife blade. A steel blank is repeatedly heated and hammered which changes the hardness of the steel, its flexibility and its ability to maintain a sharp edge.
(d) Chemical changes are also known as chemical reactions. The “ingredients” of a reaction are called the reactants, and the end results are called the products. The change from reactants to products is signified by an arrow:
Reactants → Products
The formation of gas bubbles is often the result of a chemical change (except in the case of boiling, which is a physical change). A chemical change might also result in the formation of a precipitate, such as the appearance of a cloudy material when dissolved substances are mixed.
Rotting, burning, cooking, and rusting are all further types of chemical changes because they produce substances that are entirely new chemical compounds. For example, burned wood becomes ash, carbon dioxide, and water. When exposed to water, iron becomes a mixture of several hydrated iron oxides and hydroxides. Yeast carries out fermentation to produce alcohol from sugar.
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