What controls the movement of material between the inside of the cell and the outside world?

Chemistry

2 answers:

den301095 [7]3 years ago

7 0

The answer is Cell membrane

Arlecino [84]3 years ago

4 0

Answer:

Cell membrane

Explanation:

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what is the concentration of an NaOH solution that requires 50 mL of a 1.25 M H2SO4 solution to neutralize 78.0 ml of NaOH

Dimas [21]

Answer:

The answer is the concentration of an NaOH = 1.6 M

Explanation:

The most common way to solve this kind of problem is to use the formula

C₁ * V₁ = C₂ * V₂

In your problem,

For NaOH

C₁ =?? v₁= 78.0 mL = 0.078 L

For H₂SO₄

C₁ =1.25 M v₁= 50.0 mL = 0.05 L

but you must note that for the reaction of NaOH with H₂SO₄

2 mol of NaOH raect with 1 mol H₂SO₄

So, by applying in above formula

C₁ * V₁ = 2 * C₂ * V₂

(C₁ * 0.078 L) = (2* 1.25 M * 0.05 L)

C₁ = (2* 1.25 M * 0.05 L) / (0.078 L) = 1.6 M

So, the answer is the concentration of an NaOH = 1.6 M

3 0

3 years ago

What is the approximate bond angle around the central carbon atom in acrolein?

Pavlova-9 [17]

Hello!

The approximate bond angle around the central carbon atom in acrolein is 120°

The structure of acrolein is shown in the figure below. From the structure, we can deduce that the central carbon atom is in an sp2 hybridization (Atoms with a double bond hybridize in an sp2 fashion).

Atoms with sp2 hybridization have trigonal planar geometry, in this kind of hybridization, bonds are oriented the farthest away possible from each other, to minimize overlapping and the angle that allows that is 120°.

Have a nice day!