Reaction 1: Magnesium plus hydrochloric acid

Question

Properties of the Original Substances: A small piece of a silvery metal (magnesium) and a container of clear hydrochloric acid.

Properties of Products: Small bubbles are seen accumulating on the metal strip.

Was this a chemical or physical reaction? How do you know?

Reaction 2: vinegar and baking soda

Properties of the Original Substances: A clear liquid (vinegar) and a white powder (baking soda).

Properties of Products: The combination bubbles and foams.

Reaction 2: Was this a chemical or physical reaction? How do you know?

Reaction 3: silver nitrate and sodium chloride

Properties of the Original Substances: Two clear liquids: silver nitrate solution and sodium chloride solution

Properties of Products: A white precipitates forms (a powdery substance that settles to the bottom).

Reaction 3: Was this a chemical or physical reaction? How do you know?

Write a detailed "IF -THEN" hypothesis statement for ONE of the experiments above.
Write it like an 8th grader.

Answer 1

IF-THEN Hypothesis Statement for Reaction 1: Magnesium plus Hydrochloric Acid

IF a small piece of magnesium metal is added to hydrochloric acid, THEN bubbles of hydrogen gas will form around the magnesium strip, indicating a chemical reaction is taking place. This is because the magnesium reacts with the hydrochloric acid to produce magnesium chloride and hydrogen gas, which is visible as the small bubbles accumulating on the metal strip.

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Explanation of Other Reactions:

Reaction 2: Vinegar and Baking Soda

This was a chemical reaction because when vinegar (an acid) combines with baking soda (a base), it produces carbon dioxide gas, which is what causes the bubbling and foaming. The formation of gas indicates a new substance is formed.

Reaction 3: Silver Nitrate and Sodium Chloride

This was also a chemical reaction because when silver nitrate solution and sodium chloride solution are mixed, they undergo a reaction that produces silver chloride, which forms as a white precipitate. The formation of a solid from two liquids indicates that a chemical change has occurred.

Answer 2

Choose one of the reactions and put it into 1-2 sentences.

Answer 3

In the reaction between magnesium and hydrochloric acid, the magnesium metal reacts with the acid to produce hydrogen gas, which can be observed as small bubbles forming on the surface of the magnesium strip. This indicates a chemical reaction is occurring, resulting in the formation of magnesium chloride and hydrogen gas.

Answer 4

Which reaction is it?

Answer 5

The reaction described in the 1-2 sentences is Reaction 1, which involves magnesium and hydrochloric acid.