Chemical Reactions Quiz

A student mixes a white solid and a clear liquid together. Which observation(s) is evidence that a chemical reaction occurred ?

• The mixture becomes orange.

• The mixture begins to smoke.

• The mixture gets warm.

• The mixture begins to bubble or fizz.

• The solid disappears into the liquid.

What can be inferred if the water temperature changes during a mixing process of two different ingredients?

• A chemical reaction might be releasing or absorbing energy.

• The mixing spoon might be affecting the temperature.

• There could be an error in the water measurement.

• Nothing can be inferred.

Which of the following is NOT evidence of a chemical reaction?

• The mixture begins to smoke.

• The mixture gets warm.

• The solid disappears into the liquid.

• The mixture remains unchanged.

Which of the following always results from a chemical reaction?

• Temperature change

• Fire or smoke

• Bubbles

• A new substance

A group of students put 5 mL of a white solid substance into a bottle. They poured 10 mL of a clear liquid into the bottle quickly sealed the system with a stopper with a balloon on top. They swirled the liquid to mix the two substances together and set the closed system on a table. The mixture bubbled and the balloon slowly began to inflate. Based on this information, has a chemical reaction occurred? (Select ALL that apply.)

• The mixture bubbled.

• Yes

• The white substance disappeared.

• No reaction occurred.

• A new substance, a gas, was formed which inflated the balloon.

What is a possible observation about a store-bought bath bomb once it is placed in water?

• The bath bomb remains unchanged and sinks to the bottom of the bowl.

• The bath bomb changes color, but there are no visible bubbles or fizzing.

• The bath bomb has a scent.

• The bath bomb begins to fizz and produce bubbles once it contacts the water.

Why is it important to test various combinations of bath bomb ingredients?

• Testing different combinations helps identify which ones produce gas.

• Only a few combinations need to be tested since others are not important.

• Testing various combinations is just for fun and not very serious.

• It is not important.

Why would a gas from a bath bomb extinguish a flame?

• The gas must be non-flammable to extinguish a flame.

• The gas must be highly flammable to extinguish a flame.

• The gas does not interact with fire at all.

• Magic.

Which properties can be used to identify the gas from the bath bomb?

• Density

• Flammibility

• Color

• Name of the gas

What is the expected outcome if a bath bomb is placed in hot water instead of cold water?

• The bath bomb will dissolve faster and produce more bubbles.

• The bath bomb will not dissolve at all.

• The bath bomb will change color but not produce bubbles.

• The bath bomb will sink without any reaction.