The concentration (M) of a methanol solution produced when 0.400 L of a 2.00 M solution was diluted to 0.800 L is __________ M.

ANSWER

empirical formula is the simplest ratio of whole numbers of components making up a compound

molecular formula is the actual composition of components making up a compound

to analyse each statement

A.They are always different for the same compound. -

the empirical formula in some instances can be the same as the molecular formula. therefore this statement is incorrect.

B. Subscripts of empirical formulas can be reduced

empirical formula gives the simplest ratios and the subscripts cannnot be further simplified therefore this is incorrect

C. Molecular formulas can be determined from empirical formulas

using the empirical formula, the molecular formula can be determined. therefore its correct.

D. They both show the actual ratio of elements for a compound

only the molecular formula gives the actual ratio of elements whereas the empirical formula gives the simplest ratio of elements. this statement is incorrect

The correct statement is C.

Answer:

Molecular formulas can be determined from empirical formulas.

Explanation:

Final answer:

The control group in Jordan's experiment is Plant B; the independent variable is the exposure to classical music, and the dependent variable is the number of tomatoes. Jordan's conclusion should be based on comparative results, and for future experiments, he should increase the number of plants for a stronger and more valid conclusion.

Explanation:

• In the context of Jordan's science fair project, the control group is the Plant B, which is grown under normal conditions without exposure to classical music.
• The independent variable is the exposure to classical music which applies to Plant A, while the dependent variable is the number of tomatoes produced by each plant, as this is what Jordan is comparing between the two conditions.

• Jordan's conclusion should be based on the comparative growth results between the two plants. If plant A (exposed to classical music) produces more tomatoes, he might conclude that classical music has a positive effect on the plants' growth. However, this experiment currently lacks repeatability and a larger sample size for stronger validation.

• For future experiments, Jordan should aim to increase the number of plants in both experiment and control groups. This would help to control for natural variations and strengthen the conclusion drawn.

Learn more about Science Experiment Parameters here:

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Answer:

• The changed force of attraction between the two objects is 625 N.

Explanation:

The universal law of attraction states that the gravitational attraction between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

The mathematical expression is:

• F = G m₁ m₂ / d², where

• G is the gravitational constant,
• m₁ and m₂ are the respctive masses of the two objects, and
• d = distance between the two objects.

Then, if the masses m₁ and m₂ remain unchanged and the distance (on the denominator) is reduced by a factor of 5, the 1/d² = 1/(1/5)² = 5² = 25, which means that the force will be multiplied by 25.

So, 25 N × 25 = 625 N which is the changed force of attraction between them.

Answer:

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Explanation: