Why is it important for DNA to be duplicated before mitosis


Answer 1
Answer: If it didn't, one cell would end up with the original DNA, the other wouldn't be a functional cell, because it would lack DNA. If the DNA was split between the two cells.

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What is the molar ratio of methionine to glycine in the samples?


The molar ratio of methionine to glycine is 1.8 × 10–3 mole of methionine per mole of glycine. The molar ratio is also called mole ration or mole-to-mole ratio is a ratio between any two compounds of a number of moles that is involved in a chemical reaction. To calculate the molar ratio, put the reactant moles over the reactant moles and usually divide each number by the smaller moles.  Methionine is the human essential amino acids. It is important for the growth of new blood vessels and for some supplementation. Glycine is also an amino acid that has only one single hydrogen as its side chain.

What must happen to an atom of magnesium in order to become a magnesium ion Mg+2?


Answer: Magnesium must lose two electrons to become

Explanation: Magnesium(Mg) ia a metal with atomic number of 12 and atomic mass of 24.

Atomic no = no of electrons = no of protons

Atomic Mass = no. of protons + no. of neutrons

Thus Magnesium in neutral form has got 12 electrons and 12 protons. In order to acquire a charge of +2 it must loose two electrons. Now the no of protons will be greater than no of electrons and thus the atom will acquire positive charge.

It must lose two electrons and become an ion.

Naturally occurring silver has two isotopes. isotope a has a relative mass of 106.9051 and an abundancy 51.82%. isotope b has a relative mass of 108.9047. calculate the atomic mass of silver from these data


The atomic mass of silver is 101.31 atomic mass units.

How to calculate atomic mass  from mass and abundance?

To determine atomic mass of any element, it's mass is multiplied by it's percentage abundance.

In the question, to determine atomic mass of silver,obtain the product of relative mass and  abundance of the  two isotopes given and then add them.Percent abundance is converted by dividing each percent abundance by 100.

The relative abundance of other isotope is obtained by 100%-51.82%=41.88%

isotope 1=106.9051×0.5182=55.422 atomic mass unit

isotope 2=108.9047×0.4188=45.609 atomic mass unit

Now adding 55.422+45.609=101.031 atomic mass unit

Thus, the atomic mass of silver from this data is ,101.31 atomic mass units.Atomic mass of any element is concentrated in it's nucleus.

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That would be

106.9051 * 0.5182 + 108.9047* 0.4818

= 107.8685  answer


What is happening in the following reaction? 2KClO3 2KCl + 3O2

2 moles of KClO3 decomposes to form 3 moles of product.
1 mole of KClO3 decomposes to form 5 moles of product.
2 moles of KClO3 combusts to form 5 moles of product.
2 moles of KClO3 decomposes to form 5 moles of product.


The correct answer would be the last option. From the given reaction,we can say that 2 moles of the KClO3 decomposes forming 5 moles of product which is 2 moles of KCl and 3 moles of O2. A decomposition reaction involves the breaking of a molecule into two or more smaller molecules.


2 moles of KClO3 decomposes to form 5 moles of product.


2 decomposes into 5 because on the left side we have 2 items, and on the right we have 5. It decomposes because on the left there is only 1 kind of molecule, and one the right there are 2.

Here's a tip: whenever there are more kinds of molecules on the left side than right, the answer is combusts. If the opposite is true (more on right than left), it decomposes.


Which is least likely to occur after an experiment is conducted to test a hypothesis? a.the data is analyzed to see if it supports or refutes the hypothesis.
b.the same experiment is conducted again to see if the data are reliable.
c.the hypothesis becomes a theory if the results support it.
d.a new experiment is designed to provide additional data about the hypothesis.


The least likely to occur after an experiment is conducted to test a hypothesis is "the hypothesis becomes a theory if the results support it."

What is hypothesis?

A hypothesis can be referred to as an idea or claim about the natural world that could be evaluated through observations as well as experiments.

What is experiment?

An experiment is just a technique used to prove or disprove a theory, or to test the efficacy and likelihood of something that has never been tried before.

When an experiment was undertaken to formulate a theory, the hypothesis will become a theory whereas if results support would be the least likely to happen. The results would be further analyzed, and if further experimentation is required, a new experiment would be done to provide further data even before hypothesis is accepted.

The least likely to occur after an experiment is conducted to test a hypothesis is "the hypothesis becomes a theory if the results support it."

To know more about hypothesis and experiment.


The correct answer of the given question above would be option C. The hypothesis becomes a theory, if the results support is the least likely to occur after an experiment is conducted when testing a hypothesis. The results would still be further analyzed and if needs more experiment, then another experiment will be conducted to provide more data before it will become a theory. 

Which type of nuclear energy involves splitting atoms


That would be nuclear fission. This occurs at a rapid level in the Atom Bomb. That is a chain reaction causing an explosion whereas the nuclear fission that occurs in a nuclear reactor is controlled.


Water at a rate of 45,500 kg/h is heated from 80 to 150°C in a heat exchanger having two shell passes and eight tube passes with a total surface area of 925 m2 . Hot exhaust gases having approximately the same thermophysical properties as air enter at 350°C and exit at 175°C. Determine the overall heat transfer coefficient.



U = 129.053 KJ/m².h


overall heat transfer coefficient (U):

U = (mCp(ToutH2O - TinH2O))/[A((ToutAir - TinH2O)-(TinAir - ToutH2O))/(Ln(ToutAir - TinH2O)/(TinAir - ToutH2O))]

∴ A = 925 m²


∴ mass flow H2O (m) = 45500 Kg/h

∴ Cp H2O = 4186 J/Kg°C

∴ Tin = 80°C

∴ Tout = 150°C


∴ Tin = 350°C

∴ Tout = 175°C

⇒ U = ((45500Kg/h)(4186J/Kg°C)(150-80))/(925m²)[((175-80)-(350-150))Ln((175-80)/(350-150))]

⇒ U = (1.333 E10 J/h)/(925m²)[(-150)Ln(0.475)]

⇒ U = 129052.73 J/m².h = 129.053 KJ/m².h


HELP QUICKLY PLZ!!! What is the density of each of the following gases at STP? Show your work. A. C3H9
B. Ne
C. NO2



  • C3H9- 2.013 g/l
  • Ne-0.000026 g/l
  • NO2-0.000035 g/l


So if we have the molar mass of the gas , just divide it by 22.4 to get the density of that gas.

One mole of a gas at STP has a volume of. 224 L


Molecular mass of C3H9 =45.1036 g/mol

Density =mass/volume  

=(45.1036 g/mol)/( 22.4 L/mol)

=2.013 g/l


Molecular mass of Ne (neon) =0.00060 g/mol

=(0.00060 g/mol)/ (22.4 L/mol)

=0.000026 g/l

Molecular mass of NO2 (nitrogen dioxide)=0.00080 g/mol  

=(0.00080 g/mol )/ (22.4 L/mol)

=0.000035 g/l


Select all that apply. The following diagram shows the path of a planet around the Sun. Kepler discovered that _____.


Johannes Kepler discovered that planets orbit the sun in a elliptical pattern with the sun focused in the center.

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