Respuesta :
A:
In this experiment,
✔ temperature and surface area
were intentionally manipulated. These were the independent variables.
The dependent variable measured was
✔ time of the reaction
Which observation was a sign that a chemical reaction was occurring in this experiment?
✔ formation of gas bubbles
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As the temperature of the reaction increases, what happens to the average time for the tablet to dissolve?
✔ decreases
A shorter time of reaction indicates a
✔ faster
rate of reaction.
Based on the data shown in the graph, what would be the most reasonable estimate for the time required for the same reaction at 30°C?
✔35 seconds
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Which form of the sodium bicarbonate tablet has the most surface area?
✔ crushed
As the surface area increases, what happens to the average time required for the reaction?
✔ decreases
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As the amount of surface area increases, what happens to the rate of this reaction?
✔ The rate is faster.
If the antacid tablet were broken into eight pieces, what would be a reasonable estimate for the time of reaction?
✔ 28 seconds
Why is it important to keep the temperature and the amount of water the same when testing surface area?
The temperature and the amount of water need to be kept the same so that the only variable that changes is the surface area.
Which procedures were followed in this lab to decrease experimental error? Check all that apply.
A C F
In science class, Blaine’s teacher puts one glow stick in a cup of hot water and another glow stick in a cup of cold water. She asks the students to think about how the temperature of the water will affect the chemical reaction that occurs inside the glow stick once it is bent and starts to glow.
Which glow stick will be brighter once it is bent? Explain your answer:
Sample response: The glow stick that was in the cup of hot water will be brighter once it is bent. The production of more light is evidence that the chemical reaction in the glow stick is happening faster. The reaction happens faster, because increasing the temperature increases the rate of a chemical reaction.
If a friend is making lemonade from an instant mix, which set of conditions would lead to a faster rate of dissolving the mix in the pitcher of water?
Warm water and powdered lemonade
Explanation: got it right on edge
