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Archy [21]
3 years ago
7

For this experiment what is the dependent variable?

Chemistry
1 answer:
Feliz [49]3 years ago
3 0

the number of students in each group

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In an experiment, onion plants of different ages were exposed to various amounts of caffeine to determine the effect of caffeine
VladimirAG [237]
A. is definitely true. The age of the plants and the amount of caffeine are two variables. The experimenter should have used only plants of the same age in order to determine the effect of caffeine.
b. is wrong. The amount of caffeine used was a variable.
c. is wrong. Temperature, water, and light were constants.
d. is wrong. The statement is a hypothesis that the experiment is trying to prove
5 0
3 years ago
For each of the following, indicate if the number of half-lives elapsed is:
Hunter-Best [27]

Answer:

  • <u>a. one half-life</u>
  • <u>b. three half-lives</u>
  • <u>c. two half-lives</u>

Explanation:

The number of half-lives elapsed, n, is calculated dividing the time by the half-life time:

  • n = time / half-life time

<u>a. A sample of Ce-141 with a half-life of 32.5 days after 32.5 days</u>

  • n = 32.5 days / 32.5 days = 1 half-life

<u />

<u>b. A sample of F-18 with a half-life of 110 min after 330 min</u>

  • n = 330 min / 110 min = 3 half-lives

<u />

<u>c. A sample of Au-198 with a half-life of 2.7 days after 5.4 days</u>

  • n = 5.4 days / 2.7 days = 2 half-lives
4 0
3 years ago
what mass of small stones would be needed to make the strongest concrete? give a reason for your awnser.
VikaD [51]

Answer:

For a good consert mix aggregate needed to the clean hard strong partical free of absorb chemicals or coating clay and other fine materials

3 0
4 years ago
What is the Molarity of a solution made by taking 2.5 moles and dissolving it into enough water to make 5.0 Liters of solution?
tekilochka [14]

Answer:

.5 M

Explanation:

molarity = moles / liters

2.5/5 = .5 M

5 0
3 years ago
Why would satellite imagery be more useful than a map in some instances? provides landmarks, such as buildings can be used when
miss Akunina [59]

Answer:c

Explanation:

7 0
3 years ago
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