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.

Answer 1

Only test 2 will indicate a chemical property of sodium bicarbonate. The other tests are done to confirm its physical properties. Vinegar, or acetic acid, CH3COOH, reacts with NaHCO3 to form sodium acetate, carbon dioxide and water. The reaction fizzes due to the release of CO2. Test 1 shows the solubility of NaHCO3 in water, while test 3 tests for its melting point. Both are physical properties.

Answer 2

Answer:

c

Explanation:

I DID ThE COMULATIVE