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3 years ago

PLEASE HELP I BEG

Chemistry

1 answer:

Gwar [14]3 years ago

5 0

Answer:

1.Velocity and pitch

2.The unit of vibration is hertz. The number of oscillations of an oscillating body per second is known as frequency. Complete step by step answer: The time taken by a vibrating body to complete one vibration is time period.

3.Frequencies above 20,000 Hz are known as ultrasound.

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What is the mole fraction of potassium dichromate, K2Cr2O7, in a solution prepared from 24.42 g of potassium dichromate and 240.

Harrizon [31]

Answer:

$6.19\times 10^{-3}$ is the mole fraction of potassium dichromate.

Explanation:

Mass of potassium dichromate = 24.42 g

Moles of potassium dichromate = $n_1=\frac{24.42 g}{294.185 g/mol}=0.0830 mol$

Mass of water = 240.0 g

Moles of water = $n_2=\frac{240.0 g}{18.015 g/mol}=13.3222 mol$

Mole fraction is calculated by:

$\chi_1=\frac{n_1}{n_1+n_2}$

$\chi_1=\frac{0.0830 mol}{0.0830 mol+13.3222 mol}=0.00619=6.19\times 10^{-3}$

$6.19\times 10^{-3}$ is the mole fraction of potassium dichromate.

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3 years ago

What does the word homogenous mean?

kkurt [141]

Answer:

Homogeneous means composed of parts of different kinds; having widely different elements or components.

Explanation:

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4 years ago

Describe how nucleic acid basis pair up

castortr0y [4]

The rules of base pairing (or nucleotide pairing) are: A with T: the purine adenine (A) always pairs with the pyrimidine thymine (T) C with G: the pyrimidine cytosine (C) always pairs with the purine guanine (G)

The nucleotides in a base pair are complementary which means their shape allows them to bond together with hydrogen bonds. The A-T pair forms two hydrogen bonds. The C-G pair forms three. The hydrogen bonding between complementary bases holds the two strands of DNA together.

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3 years ago

How many molecules of atp are produced as a result of glycolysis

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Answer:

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2 years ago

Read 2 more answers

5.080 x 1016 molecules of hydrogen (gas) to moles

morpeh [17]

Take note that one mole of any substance is equal to 6.02 x 10^23 molecules. Thus in converting 5.080 x 10^16 molecules of hydrogen to moles, just divide it with the Avogadro’s number. The answer would be 8.44 x 19^-8 moles...

i think that's it :P :)

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4 years ago