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2 years ago

Which of the following is an observation?

Chemistry

1 answer:

Alex Ar [27]2 years ago

4 0

Answer:

C.) Squid sometimes squirt ink.

Explanation:

Definition of observation:

Observing something or someone carefully or in order to gain information.

A.) This is not an observation. It is more like an opinion.

B.) This also isn't an observation. It is a question.

C.) This is making an observation.

Hope this helped : D

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The concentration of a biomolecule inside a rod-shaped prokaryotic cell is 0.0027 m. calculate the number of molecules inside th

mash [69]

Answer : The number of molecules inside the cell is, $8.08\times 10^6$

Solution :

First we have to calculate the volume of biomolecule cell.

Volume = Area of the base of the cell × length of the cell

$V=\pi r^2\times h$

where,

V = volume of the biomolecule cell

r = radius of the cell = $\frac{Diameter}{2}=\frac{1.2}{2}=0.6\mu m$

h = length of the cell = $4.4\mu m$

Now put all the given values in the above volume formula, we get

$V=\frac{22}{7}\times (0.6\mu m)^2\times (4.4\mu m)=4.978\mu m^3=4.978\times 10^{-15}L$

conversion : $(1\mu m^3=10^{-15}L)$

Now we have to calculate the moles of a biomolecule of the cell.

$Molarity=\frac{Moles}{Volume}\\\\Moles=Molarity\times Volume=(0.0027mole/L)\times (4.976\times 10^{-15}L)=0.01343\times 10^{-15}moles$

Now we have to calculate the number of molecules inside the cell.

$\text{Number of molecules}=Moles\times (6.022\times 10^{23})\\\\\text{Number of molecules}=(0.01343\times 10^{-15})\times (6.022\times 10^{23})=8.08\times 10^6$

Therefore, the number of molecules inside the cell is, $8.08\times 10^6$

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2 years ago

Which product of nuclear decay has mass but no charge?

polet [3.4K]

Alpha particles have a charge of +2 and a mass of 4
Gamma rays have a charge of 0 and a mass of 0
Neutrons have a charge of 0 and a mass of 1
Beta positrons have a charge of +1 and a mass of 0

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2 years ago

Placing a suspect at the scene of a crime is an important element in criminal investigation. This can be achieved through the lo

r-ruslan [8.4K]

Answer:A) cotton

A fiber if available in trace or appropriate amount can link a suspect to a crime.Solubility is a preliminary test performed for identification of the type of fiber. In this method small amount of fiber evidence is dissolved in the suitable solvent to identify it's type. Some fibers completely get solublize in the solvent, some get partially soluble and other can only change their color or do not dissolve at all.

According to the given situation, the fiber dissolved in hydrochloric acid can be cotton. As the fibers of cotton are soft and slender and will get easily solubilize in hydrochloric acid.

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3 years ago

Look at the electron-dot diagram. What type of bond would two sulfur atoms require to form a molecule?

Blababa [14]

Answer:

Double Covalent

Explanation:

When two of the same element combine it will always be a covalent bond between them and since sulfur has two lone electrons it will make a double bond between the two to have a full octect

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2 years ago

WILL MARK BRAINLIEST!!

frozen [14]

Answer:

Na 1s2 2s2 2p6 3s1

Ar 1s2 2s2 2p6 3s2 3p6

Explanation:

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2 years ago