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3 years ago

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What is the cause of rising surface temperatures of the Pacific Ocean, drought in the Western United States, flooding on the pac

ific coast of south America?
A-the Gulf Stream
B-the Jet Stream
C-La Nina
D-El Nino

1 answer:

stira [4]3 years ago

8 0

Pretty sure it's D. El Nino but not positive.

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If acetic acid is the only acid that vinegar contains (ka=1.8×10−5), calculate the concentration of acetic acid in the vinegar.

kicyunya [14]

Ethanoic (Acetic) acid is a weak acid and do not dissociate fully. Therefore its equilibrium state has to be considered here.

$CH_{3}COOH \ \textless \ ---\ \textgreater \ H^{+} + CH_{3}COO^{-}$

In this case pH value of the solution is necessary to calculate the concentration but it's not given here so pH = 2.88 (looked it up)

pH = 2.88 ==> $[H^{+}]$ = $10^{-2.88}$ = 0.001 $moldm^{-3}$

The change in Concentration Δ $[CH_{3}COOH]$ = 0.001 $moldm^{-3}$

  CH3COOH H+ CH3COOH
Initial   $moldm^{-3}$      $x$ 0 0

Change $moldm^{-3}$ -0.001 +0.001 +0.001

Equilibrium $moldm^{-3}$ $x$ - 0.001 0.001 0.001


Since the $k_{a}$ value is so small, the assumption
$[CH_{3}COOH]_{initial} = [CH_{3}COOH]_{equilibrium}$ can be made.

$k_{a} = [tex]= 1.8*10^{-5} = \frac{[H^{+}][CH_{3}COO^{-}]}{[CH_{3}COOH]} = \frac{0.001^{2}}{x}$

Solve for x to get the required concentration.

note: 1.)Since you need the answer in 2SF don&t round up values in the middle of the calculation like I've done here.

2.) The ICE (Initial, Change, Equilibrium) table may come in handy if you are new to problems of this kind

Hope this helps!

8 0

3 years ago

Large telescopes have revealed information about the motions of stars. They helped scientists realize that most stars and galaxi

fiasKO [112]

Answer:b

Explanation:sorry if I’m wrong

5 0

2 years ago

Layers of sediment forming at the bottom of the ocean

Kruka [31]

Answer: The Process is Deposition

Explanation:

7 0

2 years ago

Read 2 more answers

Upon what two factors.does magnitude of the gravitational force between two objects depend ?

kozerog [31]

Answer:

The Gravitation Force between two objects depend upon :

1).The<u> product of masses</u> of the objects

2) <u>Distance </u>Between the Objects

Explanation:

Universal Law of Gravitation : It states that Force of gravitation between two object is directly proportional to the product of masses and inversely proportional to the square of distance between them.

$F = G\frac{m_{1}m_{2}}{R^{2}}$

Here,

G = Universel Gravitational Constant

m1 = mass of 1st object

m2 = mass of 2nd object

R = distance between the objects

4 0

3 years ago

Moles to Particles

madam [21]

Answer:

There are 2,04x10 e-6 moles of water in 1.23x10e18 molecules

Explanation:

We use Avogadro's number, according to which in 1 mole of any substance there are 6,023 x 10 e23 particles (example: atoms, molecules). We calculate the number of moles according to the following simple three rule:

6,023 x 10 e23 molecules-----1 mol of water

1.23x10e18 molecules----x=

x=(1.23x10e18 molecules x1 mol of water)/6,023 x 10 e23 molecules

<em>x=2,04x10 e-6 moles of water</em>

<em></em>

6 0

3 years ago