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2 years ago

15

am gonna cry plz answer Which is not an inter molecular force? Select one: a. Inter atomic bonds b. van der waals forces c. hydr

ogen bonds

1 answer:

tatyana61 [14]2 years ago

5 0

Answer:

inter atomic bonds

Explanation:

because it is loosely held

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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 one of these is a compound? a) air b) carbon dioxide c) oxygen and d) carbon

USPshnik [31]

I believe its B from what i remember in biology class

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3 years ago

Read 2 more answers

By how many times would you expect Al2(SO4)3 to depress the F.P of water compared to sucrose C12H22011 ?

34kurt

Answer:

By how many times would you expect Al2(SO4)3 to depress the F.P of water compared to sucrose C12H22011 ?.

Explanation:

The freezing point of a pure solvent decreases further by adding a nonvolatile solute.

This is called depression in freezing point.

When an ionic solute is dissolved then the depression in the freezing point is proportional to the number of ions present in the solution.

In aluminum sulfate, there are five ions formed as shown below:

$Al_2(SO_4)_3(aq)->2Al^3^+(aq)+3SO_4^2^-(aq)$

But sucrose is a covalent compound and it does not undergo dissociation.

Hence, aluminum sulfate decreases the freezing point of water by five times compared to sucrose.

Explanation:

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2 years ago

Enter a balanced equation for the reaction between aqueous lead(II)(II) nitrate and aqueous sodium chloride to form solid lead(I

aev [14]

Answer:

Pb(NO₃)₂ (aq) + 2NaCl (aq) → PbCl₂ (s) ↓ + 2NaNO₃ (aq)

Explanation:

The reactants are:

Lead(II) nitrate → Pb(NO₃)₂ (aq)

Sodium chloride → NaCl (aq)

The products are:

Lead(II) chloride → PbCl₂ (s)

Sodium nitrate → NaNO₃ (aq)

Salts form nitrate are soluble. The chloride makes a precipitate with the Pb²⁺. The chemical equation for this reaction is:

Pb(NO₃)₂ (aq) + 2NaCl (aq) → PbCl₂ (s) ↓ + 2NaNO₃ (aq)

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3 years ago

Construct the inequality for the following cases.

Rudik [331]

Answer:

x + y < 50

Explanation:

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2 years ago