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3 years ago

C Give two reasons why the formation of aluminium by electrolysis is very expensive:

Chemistry

1 answer:

stiv31 [10]3 years ago

3 0

Answer:

It is expensive, largely because of the amount of electricity required in the extraction process. Aluminium ore is called bauxite . The bauxite is purified to produce aluminium oxide, a white powder from which aluminium can be extracted. The extraction is done by electrolysis.

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What is the SI unit for acceleration?

aivan3 [116]

Answer: m/s^2 (metre per second square)

Explanation:

Acceleration is the rate of change in velocity per unit time. The standard unit of measurement for acceleration is m/s^2 (metre per second square).

It can be derived from:

Acceleration = velocity / Time

Acceleration = (metre per second / second)

Acceleration = metre per second square.

In short form, it is written as m/s^2

7 0

3 years ago

What is the minimum (non-zero) thickness of a benzene (n = 1.501) thin film that will result in constructive interference when v

ad-work [718]

Explanation:

At each reflecting surface (benzene and glass) there will be 180 degree phase change.

Now, for constructive interference the optical path in benzene is $\lambda$ .

Formula to calculate thickness of a benzene thin film is as follows.

Optical path length through benzene ( $\lambda$ ) = $2 \times n \times d$

Hence, substituting the given values into the above formula as follows.

Optical path length through benzene = $2 \times n \times d$

d = $\frac{\text{Optical path length through benzene}}{2 \times n}$

= $\frac{\lambda}{2 \times n}$

= $\frac{615 \times 10^{-9}}{2 \times 1.501}$ (as 1 nm = $10^{-9}m$

= 204.9 m

Thus, we can conclude that minimum thickness of benzene is 204.9 m.

4 0

2 years ago

Plzzzzz help me answer this question (WILL AWARD BRAINLIEST)

Greeley [361]

The correct answer is b

5 0

2 years ago

The Reaction: _S+O2=_SO2 How many moles of sulfur must be burned to give 0.567 moles of SO2?

Vesna [10]

Moles ratio:

1 S + 1 O2 = 1 SO2

1 mole S -------------- 1 mole SO2
? moles S ------------ 0.567 moles SO2

0,567 x 1 / 1

= 0.567 moles of S

3 0

3 years ago

Read 2 more answers

Two trials are run, using excess water. In the first trial, 7.8 g of Na2O2(s) (molar mass 78 g/mol) is mixed with 3.2 g of S(s).

Tema [17]

Answer:

The answer is "Option C".

Explanation:

Given equation:

$2Na_20_2 (s)+S(s)+2H_2O \longrightarrow 4NaOH(aq)+SO_2(aq)$

$\to \Delta H^{\circ}_{rxn} (298\ K) = -610 \frac{kJ}{mol}$

$\to Na_2O_2 \ Mass = 7.8 \ g\\\\ \to Na_2O_2 \ Molar \ mass = 78 \frac{g}{mol}$

$Na_2O_2$ Has been the reactant which is limited since the two experiments are equal to $Na_2O_2$ for relationship between stress amounts.

$Na_2O_2, n =\frac{Mass of Na_2O_2}{Molar mass of Na_2 O_2}=\frac{7.8 \ g}{78 \frac{g}{mol}} =0.1 \ mol \\\\q=\Delta H^{\circ}_{rxn} \times n = \frac{ -610 \ kJ}{ 2 \ mol \ Na_2 O_2} \times 0.1 \ mol \ Na_2O_2= 30.5 \ KJ\\\\$

Limiting reactant = $Na_2O_2$

$q=30.5 \ kJ \approx 30 \ kJ$

8 0

2 years ago