Question

A scientist spilled a few drops of dilute hydrochloric acid (HCl) on a lab table. For safety purposes, the scientist sprinkled some baking soda (NaHCO3)onto the spill. Which observation would provide the best evidence that a chemical reaction occurred?

a) The hydrochloric acid evaporated, leaving only the baking soda.
b) The baking soda absorbed the hydrochloric acid.
c) The baking soda and hydrochloric acid combined, and bubbles formed.
d) Some of the baking soda dissolved in the hydrochloric acid.

Answer 1

Answer:The baking soda and hydrochloric acid combined, and bubbles formed.

Explanation:

This was due to the NEUTRALISATION reaction which took place.

After the dissapearing of the bubbles, a salt is formed

Answer 2

Option c) The baking soda and hydrochloric acid combined, and bubbles formed.

A scientist spilled a few drops of dilute hydrochloric acid (HCl) on a lab table. For safety purposes, the scientist sprinkled some baking soda (NaHCO3)onto the spill. Which observation would provide the best evidence that a chemical reaction occurred.

• Carbon dioxide gas is created when hydrochloric acid reacts with a saturated solution of sodium bicarbonate.
• Hydrogen gas is created when zinc combines with hydrochloric acid, which causes the process to bubble ferociously. The combination fizzes when sodium hydrogen carbonate and hydrochloric acid are combined. The reaction generates a gas, specifically carbon dioxide, which causes the fizzing to happen. A sodium chloride and liquid water mix makes up the remaining products.
• Carbon dioxide gas bubbles are created by the vinegar and baking soda reacting chemically.
• Baking soda combines with acidic foods, like chocolate, sour cream, or honey, to create the carbon dioxide gas that helps fluff up food when it is used in a recipe. Baking soda and cream of tartar, two ingredients in baking powder, react when they come into contact with water. The third indication that a reaction may have taken place is the creation of a gas. When two liquids are combined, bubbles frequently emerge, which is a sign that a gas has developed. When a solid is introduced to a solution, a gas might also result.

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