Reaction 1: Magnesium Plus Hydrochloric Acid
Was this a chemical or physical reaction? How do you know?
This was a chemical reaction. The evidence supporting this conclusion is the formation of small bubbles on the surface of the magnesium strip, indicating the release of hydrogen gas as a byproduct of the reaction between magnesium and hydrochloric acid. Additionally, chemical reactions involve the rearrangement of atoms and the formation of new substances, which is suggested by the bubbling behavior and the change in the state of the reactants.
Reaction 2: Vinegar and Baking Soda
Was this a chemical or physical reaction? How do you know?
This was a chemical reaction. The combination of vinegar (an acid) and baking soda (a base) produces carbon dioxide gas, which causes the bubbling and foaming observed in the reaction. The formation of gas and the significant change in physical appearance of the substances indicate that new products are being formed, which is characteristic of a chemical reaction.
Reaction 3: Silver Nitrate and Sodium Chloride
Was this a chemical or physical reaction? How do you know?
This was a chemical reaction. The mixing of silver nitrate solution and sodium chloride solution leads to the formation of a white precipitate, which can be identified as silver chloride. The appearance of this solid, which settles at the bottom, suggests that new substances have been formed that are distinct from the original clear liquids. The formation of a precipitate is a common sign of a chemical reaction.
Hypothesis Statement for Reaction 2 (Vinegar and Baking Soda)
IF vinegar is combined with baking soda in a closed container, THEN an increase in pressure will be observed due to the production of carbon dioxide gas, which could potentially lead to the container bursting if sealed tightly. This is based on the assumption that the reaction produces a significant volume of gas in a short period, indicating a vigorous chemical reaction.
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