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3 years ago

The photograph below shows the East African Rift Valley in Africa. Which tectonic movement

Chemistry

1 answer:

GalinKa [24]3 years ago

8 0

Answer:

divergence of continental crust

Explanation:

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Pls i need help with this question

zvonat [6]

Answer:

option B is the correct level

Explanation:

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8 0

2 years ago

NO2 is added to the reaction to speed it up. In which form would this substance be a homogeneous catalyst for this reaction?

sammy [17]

Answer: The correct answer is A

Explanation:

5 0

3 years ago

Electron configuration of br-1

lubasha [3.4K]

Answer:

Hi myself Shrushtee

Explanation:

The electron configuration of Br- is [Ar] 3d10 4s2 4p6

hope it will help you

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5 0

3 years ago

Fifteen points! Nothing like chemistry quizzes in the morning... >o<

sertanlavr [38]

Answer:

Explanation:

HA(aq)+H2O(l)⟺H3O+(aq)+A−(aq)(1)

you need to solve for the Ka value. To do that you use

Ka=[H3O+][A−][HA](2)

Another necessary value is the pKa value, and that is obtained through pKa=−logKa

The procedure is very similar for weak bases. The general equation of a weak base is

BOH⟺B++OH−(3)

Solving for the Kbvalue is the same as the Ka value. You use the formula

Kb=[B+][OH−][BOH](4)

The pKb value is found through pKb=−logKb

The Kw value is found withKw=[H3O+][OH−].

Kw=1.0×10−14(5)

8 0

3 years ago

5. A penny weighs about 2.5 g. How many moles of pennies would be required to equal the mass of the moon (7.3x10^24 kg)

schepotkina [342]

5. 1.16 x $10^{26}$ moles moles of pennies would be required to equal the mass of the moon.

6. 12.86 moles of ethanol are in a 750 ml bottle of vodka.

Explanation:

5 .Data given:

mass of penny = 2.5 grams

atomic mass of penny = 62.93 grams/mole

moles present in mass of the moon given as = 7.3 x $10^{24}$ kg

number of moles = $\frac{mass}{atomic mass of 1 mole}$

number of moles = $\frac{2.5}{62.93}$

0.039 moles of penny is present in 2.5 grams

0.039 moles of penny in 2.5 grams of it

so, x moles in 7.3 X $10^{27}$ grams

$\frac{0.039}{2.5} =\frac{x}{7.3 X 10^{27} }$

x = 1.16 x $10^{26}$ moles

so when the mass of the penny given is equal to the mass of moon, number of moles of penny present is 1.1 x $10^{26}$ .

Given:

vodka = 40% ethanol

volume of vodka bottle = 750 ml

moles of ethanol =?

density of ethanol =0.79 g/ml

atomic mass of ethanol = 46.07 grams/mole

so, from the density of ethanol given we can calculate how much ethanol is present in the solution.

density = $\frac{mass}{volume}$

density x volume = mass

0.79 x 750 = 592.5 grams

number of moles = $\frac{mass}{atomic mass of 1 mole}$

number of moles of ethanol = $\frac{592.5}{46.07}$

= 12.86 moles of ethanol

6 0

3 years ago