gizmos student exploration| chemical changes answer key| grade a
gizmos student exploration| chemical changes
gizmos student exploration| chemical changes answer key
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Gizmos Student Exploration| Chemical Changes Answer Key| Grade A+
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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 chemical reaction, because gas is
created, there is a fizzing sound. Also the sodium dissolves in the water, but there is not a change of
color.
2.Do you think a chemical reaction has taken place? Explain.
I think there is a chemical reaction, because there was a change of temperature, evolution ofgas and
there was a fizzy sound coming from the reaction. In addition, the PH of the water changed, which
means hydrogen ions were released.
Activity A: Get the Gizmo ready:
• Click Reset ( ). Check that the reactants are still
Observing chemical Sodium and Water.
changes • Turn on the Label reactants checkbox.
Introduction: It is important to distinguish chemical changes, in which new substances are formed, from
physical changes, which do not create new substances. In this activity, you will look at many kinds of
evidence that chemists use to see if a chemical change has taken place.
Question: What kinds of evidence indicate a chemical change has taken place?
1. Observe: Some chemical reactions release heat, and others absorb heat. In an exothermicreaction,
heat is released and the temperature of the system rises. In an endothermic reaction, heat is
absorbed and the temperature of the system decreases.
In the Gizmo, drag the Thermometer into the flask of water.
A. What is the starting temperature? 21
B. Click Play, and wait for the reaction to end. What is the final temperature? 59
C. Was this reaction exothermic or endothermic? exothermic
2. Observe: Two families of chemicals are acids and bases. Acids and bases can be detectedby an
indicator, which is a substance that changes color in the presence of an acid or a base. Phenol red is
an indicator that is yellow in an acid, orange in a neutral solution, and pink in a base.
A. Click Reset. Drag the Phenol red next to the flask of water. What does the indicatorshow?
It shows that water is neutral
B. Click Play, and wait for the reaction to end. What does the indicator show now?
The indicator shows that the substance is a base, after the reaction
2020
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