Question 1

A chemical equation for the reaction between calcium hydroxide, $Ca(OH)_2$ , and sulfuric acid, $H_2SO_4$ , is shown. The masses of some of the reactants and products are given in grams.

$Ca(OH)_2 + H_2SO_4
ightarrow CaSO_4 + 2H_2O \
\ \ \ 74g \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \underline{?} \ \ \ \ \ \ \ \ \ \ \ \ 136g \ \ \ \ \ \ \ \ \ \ 36g$ How many grams of sulfuric acid were used in the reaction?

Accepted Answer

Answer

Answer

Answer

Question 2

Which statement describes an action that most likely resulted in a chemical reaction?

Accepted Answer

A liquid was mixed with another liquid, and a precipitate formed.

Answer

A pan of water was heated on a stove, and steam formed.

Answer

A liquid was sprayed into the air, and a sweet odor was smelled.

Answer

A child blew through a wand filled with soap, and bubbles were produced.

Question 3

Which of these observations is an indication that a chemical reaction has occurred?

Accepted Answer

Steam forms above boiling water.

Answer

A solid forms when a clear solution is frozen.

Answer

A solid forms when two clear solutions are mixed.

Answer

Sugar crystals form on the sides of a boiling pot of sugar water.

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