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quester [9]
3 years ago
15

PLZ HELP ASAP!!!

Chemistry
1 answer:
melomori [17]3 years ago
6 0
Sandy soil because the sand will erode faster then the clay will causeing the well to cave in
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Write the symbol for every chemical element that has atomic number greater than 55 and less than 140.8 u
patriot [66]
Answer on the picture

8 0
2 years ago
Find the pH of 8.4x10^-8 M HCl. Report the answer to the hundredths place.
Hunter-Best [27]

Answer:

pH = 7.08

Explanation:

HCl ---------> H^+ + Cl^-

It's an acid, we are using this formula

pH = -log [H]^+

H^+ = 8.4 * 10^-8

pH = - log [8.4 * 10^-8]

It can also be solved as

-log 8.4-(-8log 10)

-0.924-(-8×1)

-0.924+8

7.076

To the nearest hundredth

pH = 7.08

8 0
3 years ago
Which of these is NOT a falsifiable hypothesis?
pashok25 [27]
D) life on earth was seeded by extraterrestrial aliens

4 0
2 years ago
Read 2 more answers
What is the percent composition of chromium in CrCl3?
maks197457 [2]

The oxidation state of Chromium chloride (III) is +3

How can we find the answer?

First of all write down what you know about the molecule:

1: The molecule hasn't got an electric charge (is not an ione), this means that either positive and negative charges of its atoms are balanced (we have the same number of positve and negative charges)

2: Since it's a salt, where the metal is chromium and the non metal is the alogen Chlorine, we know that the negative charge belogns to the non metal element because of its elettronegativity, therefore the positive charge belongs to the metale element (chromium).

3: when chlorin forms binary salts its oxidation state is always -1 (you can find out this info in a periodic table)

In <span>CrC<span>l3</span></span> we have 3 chlorine atoms where each of them carrys 1 negative charge, so the total amount of negative charges is -3

Since the charges are balanced, the question is: Which is the positive charge that Chromium must carry in order to balance 3 negative charges?

The answer comes out to +3


8 0
2 years ago
What are lone pairs of electrons?
ozzi
A lone pair is a pair of valence electrons that are not shared with another atom and is sometimes called a non-bonding pair.
5 0
3 years ago
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