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RideAnS [48]
2 years ago
9

What rock forms from magma oozing onto the surface?

Chemistry
2 answers:
timurjin [86]2 years ago
8 0
Answer: A. Igneous rock
marysya [2.9K]2 years ago
5 0
Igneous Rock is formed when magma, has a high temperature. Cooling off makes the lava harden. Creating igneous rock
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How is a tendon different from a ligament
Vaselesa [24]

Tendons connect muscle to bone. Ligaments connect bone to bone.

If you need more info I can give some more.

Hope this helps

6 0
3 years ago
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An unknown compound, X is thought to have a carboxyl group with a pKa of 2.0 and another ionizable group with a pKa between 5 an
Westkost [7]

Answer:

7.3

Explanation:

By Henderson Hasselbalch equation we can calculate the pH or the pOH of a solution by its pKa. Remember that pH = -log[H^{+}], and pKa = -logKa. Ka is the equilibrium constant of the acid.

Henderson Hasselbalch equation :

pH = pKa - log \frac{[HA]}{[A^{-}]}

Where [HA] is the concentration of the acid, and [A^{-}] is the concentration of the anion which forms the acid.

So, acid X, has two ionic forms, the carboxyl group and the other one. First, we have 0.1 mol/L of the acid, in 100 mL, so the number of moles of X

n1 = (0.1 mol/L)x(0.1 L) = 0.01 mol

When it dissociates, it forms 0.005 mol of the carboxyl group and 0.005 mol of the other group. Assuming same  stoichiometry.

Adding NaOH, with 0.1 mol/L and 75 mL, the number of moles of OH^- will be

n2 = (0.1 mol/L)x(0.075 L) = 0.0075 mol

So, the 0.0075 mol of OH^- reacts with 0.005 mol of carboxyl, remaining 0.0025 mol of OH^-, which will react with the 0.005 mol of the other group. So, it will remain 0.0025 mol of the other group.

The final volume of the solution will be 175 mL, but both concentrations (the acid form and ionic form) have the same volume, so we can use the number of mol in the equation.

Note that, the number of moles of the acid form is still 0.01 mol because it doesn't react!

So,

6.72 = pKa - log \frac{0.01}{0.0025}

6.72 = pKa - log 4

pKa - log4 = 6.72

pKa = 6.72 + log4

pKa = 6.72 + 0.6

pKa = 7.3

8 0
3 years ago
Why must living things rely on thousands of catalysts for chemical reactions necessary for life?
just olya [345]
<span>It affects only one chemical reaction</span>
8 0
3 years ago
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A rigid tank contains 2.4 kg of helium at determine the volume
ddd [48]
The volume is 1.3 for
4 0
3 years ago
Below is the structure of acetyl chloride, drawn with bonds and electron dots. determine how many nonbonding and bonding electro
erma4kov [3.2K]

Answer : The non-bonding and bonding electrons are 10 and 14 respectively.

Explanation :

Electron-dot structure : It is also known as Lewis-dot structure. It shows the bonding between the atoms of a molecule and it also shows the unpaired electrons present in the molecule.

The given molecule is, Acetyl chloride (CH_3COCl)

Carbon has '4' valence electrons, hydrogen has '1' valence electron, oxygen has '6' valence electrons and chlorine has '7' valence electrons.

Therefore, the total number of valence electrons in (CH_3COCl) = 2(4) +3(1) +6 +7 = 24

According to electron-dot structure, there are 14 number of bonding electrons ans 10 number of non-bonding electrons.

The electron-dot structure of (CH_3COCl) is shown below.

8 0
2 years ago
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