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3 years ago

What is a hypothesis?

Chemistry

1 answer:

Brums [2.3K]3 years ago

7 0

Answer:

Hypothesis is a guess on what might happen during the experiment.

B. a statement that can be tested through a scientific investigation.

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What is the total mass of Kr-42 remaining in a 20-mg sample after 48.8 hours?

iris [78.8K]

Answer:

2.5milligram

Explanation:

Due to Kr-42 the 20mg will diluted to the experinental evluation

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4 years ago

When Mendeleev organized elements in his periodic table in order of increasing mass, elements with similar properties were in th

sveticcg [70]

Mendeleev arranged the elements in rows in order of increasing mass so that elements with similar properties were in the same column.

So, the answer will be When Mendeleev organized elements in his periodic table in order of increasing mass, elements with similar properties were in the same Column.

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3 years ago

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A certain amount of gas is trapped in a nonrigid container at atmospheric pressure. If the container is cooled and the gas in th

Akimi4 [234]

Answer:

D. The volume of the container will decrease.

Explanation:

We apply here, the general gas law of ideal gases:

PV = nRT,

where, P is the pressure of the gas.

V is the volume of the container.

n is the no. of moles of the gas.

R is the general gas constant.

T is the temperature of the gas.

We are given that P is constant.

Also, n is constant as there is no added external gases.

T is decreased as the container is cooled.

So, the volume will change as the container is nonrigid.

V α T.

The volume is directly proportional to the temperature,

Thus, as the container is cooled, the T will decrease, and the volume of the container will decrease.

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4 years ago

Which of the following correctly explains the steps pictured below?

DanielleElmas [232]

Its kinda hard to tell but it looks like A because you can see the chromosome appears to be dividing at the centromere in the bottom illustration which is Anaphase II

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4 years ago

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Compounds A and B react to form compounds C and D according to the equation: aA + bB → cC + dD. Under which conditions will the

Ipatiy [6.2K]

Answer: A. The reaction takes place in one step.

Explanation:

Rate law says that rate of a reaction is directly proportional to the concentration of the reactants each raised to a stoichiometric coefficient determined experimentally called as order.

Molecularity of the reaction is defined as the number of atoms, ions or molecules that must colloid with one another simultaneously so as to result into a chemical reaction.

Order of the reaction is defined as the sum of the concentration of terms on which the rate of the reaction actually depends. It is the sum of the exponents of the molar concentration in the rate law expression.

Elementary reactions are defined as the reactions for which the order of the reaction is same as its molecularity and order with respect to each reactant is equal to its stoichiometric coefficient as represented in the balanced chemical reaction.

$aA=bB\rightarrow cC+dD$

$Rate=k[A]^a[B]^b$

k= rate constant

a= order with respect to A

b = order with respect to B

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3 years ago

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