d Gasoline burning e Steam condensing on a mirror prueica cnan f Nail rusting ce

Question

d Gasoline burning e Steam condensing on a mirror prueica cnan f Nail rusting cenonnour- g Sugar dissolving in water 3 Chemical and physical changes sometimes result in the production of a gas. Imagine such a scenario and describe two possible observations you might expect to make as evidence that a change produced a gas. 5 When a substance undergoes a chemical change, the product exhibits different physical properties than the starting material. Describe three changes in physical properties you might observe when two liquid solutions are mixed and a chemical change takes place. 2

Explanation / Answer

Answer 3 :

When baking soda and vinager react one of the products formed is carbon dioxide gas. This is a chemical change.

Another example is present as a chemical change in which product is gas , when reaction between sodium and water to produce sodium hydroxide and hydrogen gas.

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