2 years ago

A Sedentary lifestyle is a way of life that includes a lot of physical activity true or false?

Chemistry

1 answer:

geniusboy [140]2 years ago

4 0

2h-7 I had that before unless I’m tripping but I did rechecked

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Which of the following would be appropriate reason(s) for scientists to reject atomic theory?

leonid [27]

It posed a contradiction to Quantum Theory

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3 years ago

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In what two places minerals are form?

larisa [96]

In earths surface or the bottom of the Ocean

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3 years ago

Purification of copper can be achieved by electrorefining copper from an impure copper anode onto a pure copper cathode in an el

givi [52]

Answer: The amount of time needed to plate 14.0 kg of copper onto the cathode is 295 hours

Explanation:

We are given:

Moles of electron = 1 mole

According to mole concept:

1 mole of an atom contains $6.022\times 10^{23}$ number of particles.

We know that:

Charge on 1 electron = $1.6\times 10^{-19}C$

Charge on 1 mole of electrons = $1.6\times 10^{-19}\times 6.022\times 10^{23}=96500C$

$Cu^{2+}+2e^-\rightarrow Cu$

$2\times 96500=193000C$ is passed to deposit = 1 mole of copper

63.5 g of copper is deposited by = 193000 C

$14\times 1000g=14000g$ of copper is deposited by = $\frac{193000}{63.5}\times 14000=42551181 C$

To calculate the time required, we use the equation:

$I=\frac{q}{t}$

where,

I = current passed = 40.0 A

q = total charge = 42551181 C

t = time required = ?

Putting values in above equation, we get:

$40.0=\frac{42551181 C}{t}\\\\t=1063779sec$

Converting this into hours, we use the conversion factor:

1 hr = 3600 seconds

So, $1063779s\times \frac{1hr}{3600s}=295hr$

Hence, the amount of time needed to plate 14.0 kg of copper onto the cathode is 295 hours

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3 years ago

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GenaCL600 [577]

Answer:

Huh?

Explanation:

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2 years ago

The empirical formula of hydrazine, molecular mass 32 grams, is NH2. What is the molecular formula of hydrazine?

fgiga [73]

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C) I think..

Explanation:

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2 years ago