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k0ka [10]
2 years ago
14

Brian is testing to see how much water plants need. Why is it important that Brian includes a control group? A) To observe wheth

er plants need water or not B)To confirm that plants need 25ml of water per day C)To confirm that plants need 75ml of water per day D) To observe one variable at a time
Chemistry
1 answer:
bija089 [108]2 years ago
7 0

Answer: B or C

Explanation: The question does not include the variable or steps Brian is using so either one could be correct. It has to be the one that he is controlling though. This is because a control group is used to rule out any alternate explanations. Therefore the answer should be the one that he is trying to test out.

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How many atoms are in 4H3BO3
maksim [4K]

1 mole of h3bo3...........6.023*10²³ each h and B and 0 so we will have 3hydrogen+ 1 B+3 oxygen = 7*6.023*10²³ atoms

1 mole .......7*6.023*10²³atoms

4 moles ........x atoms

x=4*7*6.023*10²³.

3 0
3 years ago
A can was filled with crushed ice, sealed, and massed. The ice was melted by slowly warming the can and its contents. No water v
Lera25 [3.4K]

Answer:

A) The mass would be the same.

Explanation:

Since there is no loss of any particle to vapor during the phase change process from solid to liquid, the mass of the before and after the process will remain the same.

  • In this way, the law of conservation of mass is obeyed.
  • Mass is the amount of matter contained in a substance.
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8 0
3 years ago
Read 2 more answers
If the temperature of a gas increased and the pressure remains the same what happens to the volume of gas?​
podryga [215]

Answer:

the answer is B.

Explanation:

The pressure increases... plus i had this same question

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3 0
3 years ago
Could a man with type B blood and a woman with type AB produce a child with type O blood?
Luda [366]

Answer:

The possible genotypes of a man with blood type B are BB or BO and the genotype of a woman with blood type AB is AB. The child would receive an A allele or a B allele from the mother and a B allele or an O allele from the father. Therefore, the child could not possibly be of blood type O.

Explanation:

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4 0
3 years ago
What is the most appropriate unit of astronomical distance to represent the distance between an earth an orbiting space station
Reil [10]
Astronauts use "Astronomical Unit" to measure the distance between planets in our solar system "only". To measure long distances like between 2 galaxies, they use "light years". One Astronomical Unit = Average distance between sun and earth which is equal to 149.6 million kilometers. Ping me if you have any doubt.
4 0
3 years ago
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