it's question of science please answer
Answers
Answer:
1 . Every change has a cause
2. New substance are formed in Chemical change
• A change in which one or more new substances are formed is called a chemical change. A chemical change is also called a chemical reaction. Chemical changes are very important in our lives. All new substances are formed as a result of chemical changes.
3. changes occurring only in one direction are unidirectional
4. reaction in which energy is absorbed from the surroundings is called an endothermic reaction. In endothermic reactions the enthalpy of the products is greater than the enthalpy of the reactants. Because reactions release or absorb energy, they affect the temperature of their surroundings...
5. Day and night is a physical change.
• the change of day and night is a physical change as it can be reversed
6.A physical change is a change to the physical—as opposed to chemical—properties of a substance. They are usually reversible. The physical properties of a substance include such characteristics as shape (volume and size), color, texture, flexibility, density, and mass.
7. Cooking of food is a chemical change.
• Cooking food is an irreversible, chemical change. During cooking, the molecules that are present in food changes to form new substances.
9. melting of ice is a physical change.
• As an ice cube melts, its shape changes as it acquires the ability to flow. However, its composition does not change. Melting is an example of a physical change .
10.
• Does Soil Expand When Wet? Not all soils expand when wet but a number of fine grained clay minerals possess expansive qualities. The amount of expansive minerals such as montmorillonite, vermiculite and some sulfate salts also affect how much a soil can expand
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