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- 1. Multiple Choice
Which of these is NOT a sign that a chemical change has occurred?
A loss of transparency
An unexpected color change
A temperature change
The formation of a new substance
- 2. Multiple Choice
When coal burns carbon dioxide is produced from the carbon in coal and the oxygen in air. Which of these is the best evidence that a chemical reaction occurs when coal burns?
The shape of the coal changes
Oxygen is present
A new substance is produced
Coal is made up of more than one element
- 3. Multiple Choice
How do chemical reactions turn substances into new substances?
with burning acid
when substances are stirred
the atoms break apart and combine back together in new ways
the ionic compounds mix in water to form solutions
- 4. Multiple ChoiceWhen two substances were combined, bubbles were produced and the temperature dropped. This most likely means that:a chemical reaction took placethe two substances had low boiling pointsone substance dissolved in the otherthe two substances are non-reactive
- 5. Multiple Choice
A student places a piece of a potato into a container of hydrogen peroxide and observes bubbles forming around the potato. The presence of bubbles might indicate the formation of a new substance because bubbles -
could show that a gas is forming
always rise to the top of a liquid.
are almost always perfectly spherical.
usually burst after a few minutes.
- 6. Multiple Choice
Hydrogen peroxide breaks down to form water and oxygen gas. A thermometer indicates an increase in temperature. Which observation is evidence that a chemical reaction has occurred?
The mass of the solution remains the same.
Phase changes are observed.
The color of the solution remains clear.
The temperature of the solution increases.
- 7. Multiple Choice
Four students performed four different investigations by combining different substances. Which of the observations is most indicative of a chemical reaction?
investigation 1
investigation 2
investigation 3
investigation 4
- 8. Multiple Choice
A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?
The level of the substance in the beaker is higher after the other liquid is added.
A yellow solid forms and then settles to the bottom of the beaker.
- 9. Multiple Choice
Which one of these examples is NOT a chemical reaction?
Firework Exploding
Ice Melting
Car Rusting
Baking a Cake
- 10. Multiple ChoiceWhen a scientist mixed two chemicals, an exothermic reaction takes place. Which of the following would be proof that the reaction was exothermic?a change of colora change of statea temperature decreasea temperature increase
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