Question

marco wants to investigate the chemical properties of sodium bicarbonate, or baking soda. he plans to carry out the tests below. test 1: mix a teaspoon of sodium bicarbonate into a cup of warm water to see if it dissolves. test 2: mix a teaspoon of sodium bicarbonate into a cup of vinegar to see if it fizzes. test 3: heat a teaspoon of sodium bicarbonate in the oven to see if its melting point is less than 400 degrees fahrenheit. which statement provides the best assessment of his tests? only test 3 will indicate a chemical property of sodium bicarbonate. tests 1 and 2 will show a physical property of the substance. only tests 1 and 2 will indicate chemical properties of sodium bicarbonate. test 3 will show a physical property of the substance. only test 2 will indicate a chemical property of sodium bicarbonate. tests 1 and 3 will show a physical property of the substance. only tests 1 and 3 will indicate chemical properties of sodium bicarbonate. test 2 will show a physical property of the substance.

Explanation:

A physical property can be observed or measured without changing the substance's chemical identity. Dissolving (Test 1) and measuring melting - point (Test 3) are physical properties. A chemical property is observed when a substance undergoes a chemical change. Mixing sodium bicarbonate with vinegar (Test 2) causes a chemical reaction (fizzing is due to carbon dioxide gas production), indicating a chemical property.

Answer:

Only Test 2 will indicate a chemical property of sodium bicarbonate. Tests 1 and 3 will show a physical property of the substance.