All categories

3 years ago

If you can answer this question I will mark you BRAINLIEST

Chemistry

1 answer:

11111nata11111 [884]3 years ago

8 0

Answer:

cause the ectonic plates moving are what made

Explanation:

You might be interested in

Why is climate change a concern when it comes to animal behavior and ability to reproduce

kow [346]

Answer:

hope this helps! :)

Explanation:

While humans and many other animals determine sex genetically, many reptiles and some fish use the incubation temperature of the eggs to set the gender of their offspring. This means that changing global temperatures could alter the ratio of sexes produced, making it harder for these animals to find mates

4 0

3 years ago

weather balloon is filled with helium to a volume of 340 L at 30 ∘C and 751 mmHg . The balloon ascends to an altitude where the

valentinak56 [21]

Answer: Thus the volume of the balloon at this altitude is 419 L

Explanation:

Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

$\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}$

where,

$P_1$ = initial pressure of gas = 751 mm Hg

$P_2$ = final pressure of gas = 495 mm Hg

$V_1$ = initial volume of gas = 340 L

$V_2$ = final volume of gas = ?

$T_1$ = initial temperature of gas = $30^oC=273+30=303K$

$T_2$ = final temperature of gas = $-27^oC=273-27=246K$

Now put all the given values in the above equation, we get:

$\frac{751\times 340}{303}=\frac{495\times V_2}{246}$

$V_2=419L$

Thus the volume of the balloon at this altitude is 419 L

8 0

3 years ago

What is the standard emf of a galvanic cell made of a cd electrode in a 1.0 m cd(no3)2 solution and a cr electrode in a 1.0 m cr

Natali5045456 [20]

Standard reduction potential of Cd2+ = -0.403 v
Standard reduction potential of Cr3+ = -0.74 v

Here, reduction potential of Cd2+ is higher as compared to Cr3+. Hence, it will preferentially undergo reduction.

The electrochemical cell is represented as
Cr/Cr3+// Cd2+/Cd

Now, standard EMF of cell = E = ECd2+/Cd - ECr3+/Cr
= - 0.403. - (-0.74)
= 0.337 v

8 0

3 years ago

BONUS QUESTION

devlian [24]

Answer:

pH = 12.5

Explanation:

The reaction that takes place is

2OH⁻(aq) + Pb⁺²(aq) → Pb(OH)₂(s)

The OH⁻ species come from the metal hydroxide of the solution, and Pb(OH)₂ is the precipitate.

Now we convert 3.81 grams of Pb(OH)₂ into moles, using its molar mass:

3.81 g ÷ 241.12 g/mol = 0.0158 mol Pb(OH)₂

Now we convert 0.0158 Pb(OH)₂ moles into OH⁻ moles, using the stoichiometric coefficients of the reaction:

0.0158 mol Pb(OH)₂ * $\frac{2molOH^-}{1molPb(OH)_2}$ = 0.0316 mol OH⁻

With the given concentration (1 L), we calculate [OH⁻]:

[OH⁻] = 0.0316 mol / 1 L = 0.0316 M

Then we calculate the pOH of the solution:

pOH = - log[OH⁻] = 1.5

And finally we calculate the pH:

pH = 14 - pOH

pH = 12.5

6 0

2 years ago

He henry's law constant of oxygen in water at 25 Â°c is 773 atm mol-1kg h2o. calculate the molality of oxygen in water under a p

motikmotik

Henry law:

P = KC
P = solvent vapour pressure
K = Henry constant
C = conc of solute

So, 0.2 = 773 C
so, C = 0.2 / 773 = 2.5 x 10^{-4} molal

4 0

3 years ago