Question text not available
The dependent variable measured was [___].
temperature and use of a catalysttemperature and surface areasurface area and concentrationconcentration and use of a catalyst
Which observation was a sign that a chemical reaction was occurring in this experiment?
As the temperature of the reaction increases, what happens to the average time for the tablet to dissolve? increasesdecreasesstays the same
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?
Which form of the sodium bicarbonate tablet has the most surface area? tablet formquarteredcrushed
As the amount of surface area increases, what happens to the rate of this reaction? The rate is faster.The rate is slower.The rate stays the same.
Why is it important to keep the temperature and the amount of water the same when testing surface area?
It is important to keep the temperature and the amount of water constant so that the experiment is a controlled test. By keeping these variables the same, you ensure that surface area is the only independent variable affecting the reaction rate. If temperature or water volume changed, you would not be able to determine which factor caused the observed change in the rate of reaction.
Which procedures were followed in this lab to decrease experimental error? Check all that apply.
Which glow stick will be brighter once it is bent? Explain your answer.
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, leading to more frequent and energetic collisions between molecules.
Cold water and powdered lemonade Cold water and lemonade tabletsWarm water and powdered lemonade Warm water and lemonade tablets
A shorter time of reaction indicates a fasterslowerequivalent rate of reaction.
As the surface area increases, what happens to the average time required for the reaction? increasesdecreasesstays the same
If the antacid tablet were broken into eight pieces, what would be a reasonable estimate for the time of reaction? 60 seconds46 seconds28 seconds9 seconds
Sample response: The temperature and the amount of water need to be kept the same so that the only variable that changes is surface area. If you allow the temperature and/or the amount of water to change too, you will not know which variable is causing the changes that you observe. Which of the following did you include in your answer? Check all that apply.The temperature and the amount of water need to be kept the same so that the only variable that changes is the surface area.If you allow the
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. Which of the following did you include in your answer? Check all that apply.The glow stick that was in the cup of hot water will be brighter once it is bent.The production of more light i
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