All categories

3 years ago

What is thr driving force of convection in the atmosphere and ocean?

1 answer:

5 0

<span>Mantle convection is the slow creeping motion of Earth's rocky mantle caused by convection currents carrying heat from the interior of the earth to the surface. It is one of 3 driving forces that causes tectonic plates to move around the Earth's surface.</span>

You might be interested in

How does a sample of hydrogen at 10 degrees Celsius compare to a sample of hydrogen at 350K?

Sophie [7]

Answer:

We can compare the both sample by taking into account the kinetic energy.

By increasing the temperature kinetic energy of gas molecules increased.

Explanation:

It is known that kinetic energy of molecules is increased by increasing the temperature.

We are given with two sample of hydrogen one is at 10°C and other is at 350 K.

Hydrogen sample at 10°C = 273.15 + 10 = 283.15 k

Thus one sample is at 283.15 K and other is at 350 K. So, the sample at higher temperature i.e 350 K will have more kinetic energy of molecules.

While the sample at 283.15 K will have less speed of molecule and kinetic energy.

8 0

3 years ago

Recalling that a beaker of water is two dimensional, what is the three dimensional shape of the micelle

saul85 [17]

A micelle refers to an aggregate of a surfactant molecule, which a dispersed in a liquied colloid. In an aqueous liquid, a micelle is arranged in such a way that its hydrophillic head region will be in contact with the surrounding solvents while the hydrophobic tail region will be embedded in its center.
The three dimensional shape of a micelle is A SPHERE.

7 0

3 years ago

Why is a solution that is 0.10M HCN and 0.10M LiCN considered a good buffer system?

const2013 [10]

Because of the common ion effect. Adding a common ion decreases the solubility of the salt which is the intention of a buffer.

8 0

3 years ago

3. Methyl acetate is hydrolyzed at 25 oC in acidic environment. Aliquots of equal volume are removed and titrated with NaOH solu

avanturin [10]

Solution :

Time (sec) Volume of NaOH (mL)

339 26.23

1242 27.80

2745 29.70

4546 3.81

$\infty$ 39.81

Now the example of the first order kinetics w.r.t volumetric analysis is :

$k=\frac{2.303}{t} \log \left(\frac{v_{\infty}-v_0}{v_{\infty}- v_t}\right)$

Here, $v_{\infty}= \text{ volume at }\infty = 39.81$

$v_{t}= \text{ volume at time 't' } = 27.80$

$v_0$ = volume at time 0 = 0

Since the interval is not constant, we take the time interval as

$=\frac{903+1503+1801}{3}$

$=\frac{4207}{3}$

= 1402.3333

≈ 1402 seconds

$k=\frac{2.303}{1402} \log \left(\frac{39.81-0}{39.81-27.80}\right)$

$=(0.001643) \log \left(\frac{39.81}{10.01}\right)$

= 0.001643 x 0.52045

= 0.00082

$= 8.55 \times 10^{-4} \ sec^{-1}$

Therefore, the first order rate constant is k $= 8.55 \times 10^{-4} \ sec^{-1}$ .

5 0

2 years ago

Which balanced equation represents a redox reaction?

nlexa [21]

Answer: option (3) CuO + CO ⇄ Cu + CO₂

Explanation:

1) A redox reaction is an oxidation-reduction reaction.

2) An oxidation-reduction reaction is one in which at least one species is oxidized and other (or others) is reduced.

3) Oxidation is the increase on the oxidation number, which occurs by releasing electrons.

4) Reduction is the decrease of the oxidation number, which occurs by gaining electrons.

5) By looking at the oxidation numbers of the reactants and the products you can tell whether a reaction is a redox one.

6) There are some rules to calculate the oxidation states which you need to handle to determine the oxidation states of the atoms in any chemical formula.

7) The main rule that you can use at a glance is if an element is alone in one side of the equation and is bonded to other kind of atom in the other side.

That is because the rule states that for any element that is not combined with other element its oxidation state is 0.

In this case, you can apply that rule to the equation of the choice number (3). In that, you can see that Cu is pure which as per the mentioned rule means that its oxidation state is 0.

As Cu is combined with O, CuO, in the reactant side of the chemical equation, then its oxidation number is not 0. Indeed, the rule is that in the formula CuO the oxidation states of Cu and O add up 0, and since the oxidation number of O is 2-, the oxidation number of Cu is 2+.

Therefore, having Cu changed its oxidation state from 2+ to 0, it was reduced, and this is a redox reaction.

Of course other atoms had to be oxidized. It was C whose oxidation state went from 2+ in CO to 4+ in CO₂.

7 0

3 years ago

Read 2 more answers