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3 years ago

Read this sentence from Chapter One of Jack London’s The Call of the Wild.

Chemistry

2 answers:

umka21 [38]3 years ago

7 0

Answer:B

Explanation: i took the quiz on edge

xenn [34]3 years ago

4 0

Answer:

Explanation:

It shows the natrual proggresion of a story and helps blend the narrtive together.

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Silica (also known as silicon dioxide) reacts with hydrofluoric acid to produce silicon tetrafluoride and water vapor.

EleoNora [17]

The problem is solved by balancing the reaction equation as shown below. The stoichiometry of the reaction is now applied in solving the question.

The balanced reaction equation is:

SiO2 + 6HF → H2[SiF6] + 2H2O

Using stoichiometry

The amount of silicon dioxide reacted = 12.5 g/60.08 g/mol = 0.21 mole

1 mole SiO2 yields 2 moles of H2O

0.21 mole of SiO2 yields 0.21 * 2/1 = 0.42 moles of H2O

The amount of HF reacted = 24.6 g/20.01 g/mol = 1.23 moles of HF

6 moles of HF yield 2 mole of H2O

1.23 moles of HF yields 2 * 1.23/6 = 0.41 moles of H2O

Hence HF is the limiting reactant.

Theoretical yield of H2O = 0.41 moles of H2O * 18 g/mol = 7.38 g

The percentage yield of the water is = actual yield/theoretical yield * 100

Hence;

% yield = 2.50 g/7.38 g * 100 = 33.9%

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3 years ago

Read 2 more answers

What could be the potential benefits of<br> atomic-scale medicine delivery systems?

Novay_Z [31]

Answer:

Nanotechnology has finally and firmly entered the realm of drug delivery. Performances of intelligent drug delivery systems are continuously improved with the purpose to maximize therapeutic activity and to minimize undesirable side-effects. This review describes the advanced drug delivery systems based on micelles, polymeric nanoparticles, and dendrimers. Polymeric carbon nanotubes and many others demonstrate a broad variety of useful properties. This review emphasizes the main requirements for developing new nanotech-nology-based drug delivery systems.

Explanation:

6 0

4 years ago

If the reacants of a chemical raction have 15 Carbon atoms, 72 Lead

alexandr1967 [171]

Answer:

In the human body, potential energy is stored in the bonds between atoms and molecules. Chemical energy is the form of potential energy in which energy is stored in chemical bonds. When those bonds are formed, chemical energy is invested, and when they break, chemical energy is released. Notice that chemical energy, like all energy, is neither created nor destroyed; rather, it is converted from one form to another. When you eat an energy bar before heading out the door for a hike, the honey, nuts, and other foods the bar contains are broken down and rearranged by your body into molecules that your muscle cells convert to kinetic energy.

Explanation:

3 0

3 years ago

g In the elimination reaction of t-butanol and t-butyl bromide. A. They have a common intermediate and require a strong base B.

11111nata11111 [884]

Answer:

Both reactions share a common intermediate and differ only in the leaving group

Explanation:

The elimination reaction of tertiary alkyl halides usually occur by E1 mechanism. In E1 mechanism, the substrate undergoes ionization leading to the loss of a leaving group and formation of a carbocation.

Loss of a proton from the carbocation completes the reaction mechanism yielding the desired alkene.

In the cases of t-butanol and t-butyl bromide, the mechanism is the same. The both reactions proceed by E1 mechanism. The leaving groups in each case are water and chloride ion respectively.

6 0

3 years ago

How many moles are in a 501mL of a 2.37 M solution of Al2(SO4)3?

MissTica

The number of moles of Al₂(SO₄)₃ is 1.2 mol

<u>Explanation:</u>

Given:

Volume of the solution, V = 501 mL

V = 0.501L

Molarity of the solution, M = 2.37M

Moles, n = ?

We know:

Molarity = $\frac{moles of solute}{volumeof solution}$

On substituting the values we get:

$2.37 = \frac{n}{0.501} \\\\n = 1.2 mol$

Therefore, the number of moles of Al₂(SO₄)₃ is 1.2 mol

8 0

3 years ago