G.State whether the following statements are true or false: 1. SO is an example of compound radical. 2. A chemical change is a temporary change. 3. Fluorine is less reactive than Iodine. 4. Decomposition of silver nitrate involves sunlight. 5. Magnesium is a divalent metal.
Answers
Answer:
A chemical change is a change that brings a change in the chemical properties of matter and a new substance is formed.
Examples of chemical changes from the given list of changes are:
Rusting of iron, Cooking of food, Digestion of food, and Burning of a candle.
1)Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.
2)
Burning of paper and log of wood.
Digestion of food
Boiling an egg. Milk going sour
Chemical battery usage.
3) A 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)One example of a reversible reaction is the
reaction of hydrogen gas and iodinefrom hydrogen iodide.... In the forward reaction,
hydrogen and iodine combine to form hydrogen
iodide. In the reverse reaction, hydrogen iodide
decomposes back into hydrogen and iodine.
5)Physical changes are changes affecting the form of a chemical substance, but not its chemical composition Physical changes
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