Gizmos Student Exploration| Chemical Changes Answer Key| Grade A+

Student Exploration: Chemical Changes

Vocabulary: acid, base, catalyst, chemical change, coefficient, conservation of matter, decomposition,

dissolve, double replacement, endothermic, exothermic, indicator, ion, physicalchange, product, reactant,

single replacement, subscript, synthesis

Prior Knowledge Questions (Do these BEFORE using the Gizmo.)

1. A student mixes baking soda and vinegar in a glass. The resultsare

shown at left. Do you think any new substances are being created in

this mixture? If so, how do you know?

Yes, because, as shown in the image, there are bubbles,therefore

gas is being released, which are characteristics of a chemical

change.

2. Suppose this was done on top of a balance. Do you think themass

would change as the reaction proceeded? yes

3. What do you think would happen to the mass if the reaction took place inside a sealed plastic bag?

Then, the mass would not change, because the gases being released in

the reaction are being collected

Gizmo Warm-up

A chemical change, (or chemical reaction) occurs when oneor

more substances, called reactants, are transformed into different

substances, or products. In the Chemical Changes Gizmo, you

will look for evidence of chemical changes by looking at changes

you can see, touch, or smell.

To begin, check that Reactant 1 is Sodium and Reactant 2

is Water. Sodium is a metal so soft you can cut it with a knife.

1. Click Play ( ). What do you observe?

2020

When the Sodium is put inside the water container, there is a c

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Language English
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