Question 14 • $2526: SEM 1: 2003310: Physical Science: NEW
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.
Answer
O
Only Test 3 will indicate a chemical property of sodium bicarbonate. Tests 1 and 2 will show a physical property of the substance.
O
Only tests 1 and 2 will indicate chemical properties of sodium bicarbonate. Test 3 will show a physical property of the substance.
O
Only Test 2 will indicate a chemical property of sodium bicarbonate. Tests 1 and 3 will show a physical property of the substance.
O
Only tests 1 and 3 will indicate chemical properties of sodium bicarbonate. Test 2 will show a physical property of the substance.
Explanation
Dissolving baking soda in warm water (Test 1) is a physical change: the substance dissolves without forming a new substance. Mixing it with vinegar (Test 2) causes fizzing as a chemical reaction produces carbon dioxide, so this tests a chemical property. Melting point (Test 3) is a physical property, even though heating may cause a change of state. Therefore, only Test 2 indicates a chemical property, matching choice C.
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