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3 years ago

Experts believe that a good night sleep is vital to a success in school. Would kids that sleep 8 or

Chemistry

1 answer:

Artyom0805 [142]3 years ago

6 0

Answer:

kids who sleep 8 or more hours a night

Explanation:

I hypothesize that kids who sleep 8 plus hours a night because your brain needs a good night's sleep to regenerate .

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Can someone help mee pleaseeeee please!

Georgia [21]

Answer:

im sorry dude, just trying to complete my daily challenge

Explanation:

7 0

3 years ago

What mass of Al would be obtained from the complete reduction of 10.2 tonnes of Al2O3?

Fynjy0 [20]

Answer:

5.4 tonnes.

Explanation:

The first step is to find the molar mass of Al2O3. Aluminum has a molar mass of about 27 and oxygen has a molar mass of about 16, so 2(27)+3(16)= 102g/mol=0.102kg/mol. 10200kg/0.102kg/mol=100,000 moles of Al2O3 in 10.2 tonnes. Multiplying this by the molar mass of the two aluminums, you get a total of 54*100,000=5400000g=5400kg=5.4 tonnes. Hope this helps!

3 0

3 years ago

True or false???????????

Leni [432]

Answer:

false

Explanation:

longer the wave length less frequency

7 0

3 years ago

In the lab, frank has two solutions that contain alcohol and is mixing them with each other. he uses 100 milliliters less of sol

VladimirAG [237]

Solution B (17% alcohol) = x ml
Solution A (13% alcohol) = (x-100) ml

0.17x ml alcohol in Solution B
0.13(x-100) ml alcohol in Solution A

0.17x + 0.13(x-100) = 347
0.17x+0.13x-13=347
0.3x = 360
x=360/0.3=3600/3=1200 ml solution B

7 0

3 years ago

Read 2 more answers

A sample of ammonia gas was allowed to come to equilibrium at 400 K. 2NH3(g) <---> N2(g) 3H2(g) At equilibrium, it was fou

Softa [21]

Answer:

Kc for this equilibrium is 2.30*10⁻⁶

Explanation:

Equilibrium occurs when the rate of the forward reaction equals the rate of the reverse reaction and the concentrations of reactants and products are held constant.

Being:

aA + bB ⇔ cC + dD

the equilibrium constant Kc is defined as:

$Kc=\frac{[C]^{c}*[D]^{d} }{[A]^{a} *[B]^{b} }$

In other words, the constant Kc is equal to the multiplication of the concentrations of the products raised to their stoichiometric coefficients by the multiplication of the concentrations of the reactants also raised to their stoichiometric coefficients. Kc is constant for a given temperature, that is to say that as the reaction temperature varies, its value varies.

In this case, being:

2 NH₃(g) ⇔ N₂(g) + 3 H₂(g)

the equilibrium constant Kc is:

$Kc=\frac{[N_{2} ]*[H_{2} ]^{3} }{[NH_{3} ]^{2} }$

Being:

[N₂]= 0.0551 M
[H₂]= 0.0183 M
[NH₃]= 0.383 M

and replacing:

$Kc=\frac{0.0551*0.0183^{3} }{0.383^{2} }$

you get:

Kc= 2.30*10⁻⁶

<u><em>Kc for this equilibrium is 2.30*10⁻⁶</em></u>

8 0

4 years ago