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labwork [276]
3 years ago
10

How many elements have been discovered? A. 110 B. less than 110 C. more than 110

Chemistry
2 answers:
riadik2000 [5.3K]3 years ago
8 0
There are 115 known elements as of today (Feb. 13, 2016)

so, 'C' is the correct answer
Ivenika [448]3 years ago
6 0
C. more than 110. We have 115 elements known for Feb 2016.
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Find the hybridization of carbon in acetone​
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Acetone has the oxygen and the carbon sp2 hybridized. In carbon dioxide, the oxygens are sp2, but the carbon is sp hybridized. ... For SO2−4, the sulfur needs to utilize 2 of the d orbitals for the sigma bonds, so it would be spd^2 hybridized, and it uses the 2 p orbitals for the pi bonds.
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What does the zebra mussel do to affect the ecosystem
dangina [55]

Answer:

The explanation of the type of situation would be characterized below.

Explanation:

  • Zebra mussels, therefore, have a direct as well as indirect (significant) impact on natural ecosystems. The much more significant impact is on the feed intake interaction including its mussel.
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3 years ago
Is it possible for a diprotic acid to have Ka1?
Masja [62]

Answer:

Yes, it is possible.

Explanation:

A diprotic acid is an acid that can release two protons. That's why it is called diprotic.

Monoprotic → Release one proton, for example Formic acid HCOOH

Triprotic → Releases three protons, for example H₃PO₄

Polyprotic → Release many protons, for example EDTA

it is a weak acid.

In the first equilibrum, it release proton, and the second is released in the second equilibrium. So the first equilibrium will have a Ka1

H₂A  +  H₂O  ⇄  H₃O⁺  +  HA⁻                Ka₁

HA⁻  +  H₂O  ⇄  H₃O⁺  +  A⁻²               Ka₂

The HA⁻ will work as an amphoterous because, it can be a base or an acid, according to this:

HA⁻   +  H₂O  ⇄  H₃O⁺   + A⁻²      Ka₂

HA⁻   +  H₂O  ⇄  OH⁻   + H₂A       Kb₂

4 0
3 years ago
Draw the Lewis dot structure for benzene
gavmur [86]

Answer:

Explanation:

Benzene is an example for six membered aromatic hydrocarbons

8 0
3 years ago
Read 2 more answers
You need 270 ml of a 65% alcohol solution. on hand, you have a 90% alcohol mixture. how much of the 90% alcohol mixture and pure
olganol [36]

You must add 75 mL water to 195 mL 90 % alcohol to make 270 mL of 65 % alcohol.

<em>Step 1.</em> Calculate the volume of 90 % alcohol needed

You can use the dilution formula

<em>V</em>1×<em>C</em>1 = <em>V</em>2×<em>C</em>2

where

<em>V</em>1 and<em> V</em>2 are the volumes of the two solutions

<em>C</em>1 and <em>C</em>2 are the concentrations

You can solve the above formula to get

<em>V</em>2 = <em>V</em>1 × <em>C</em>1/<em>C</em>2

<em>V</em>1 = 270 mL; <em>C</em>1 = 65 %

V2 = ?; _____<em>C</em>2 = 90 %

∴<em>V</em>2 = 270 mL × (65 %/90 %) = 195 mL

You need 195 mL of 90 % alcohol to make 270 mL of 65 % RA

<em>Step 2</em>. Calculate the amount of water to add.

Volume of water = 270 mL – 195 mL = 75 mL

8 0
3 years ago
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