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3 years ago

How is controlling the rate of a chemical reaction useful to a chemical engineer, physician and chef?

1 answer:

5 0

Controlling the rate of chemical reactions is crucial to a chef because that is what gives food its flavor. Bread that rises too fast or slow (yeast cells converting glucose into carbon dioxide) will taste awful compared to correctly risen bread. Flambé undergoes a very fast, but brief, chemical reaction when the alcohol in which it is smothered is ignited, caramelizing the creme on top. A slow reaction would melt it all, while an even faster reaction could cause the dish to explode.

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Choose all the answers that apply.

stepladder [879]

Answer:

The Earth:

Is tilted 23 1/2° on its axis .

Rotates from west to east .

Bulges slightly at the equator .

Revolves around the sun once every 365 1/4 days .

Explanation:

The only option that is incorrect is the first one - The Earth has a circular orbit around the sun-. Although the Earth has an orbit around the sun, this one is not circular, it is elliptical, this is similar to an inclined oval, and the planet rotates in this orbit with an inclination on its axis of 23 1/2º.

As well as the shape of the orbit is not circular, the shape of the Earth is not equal in all its parts, it is wider in the equator in comparison with the North and South Poles.

It rotates from west to east in its axis, and it takes 365 1/4 days to complete a round in its orbital.

8 0

3 years ago

The equation of tris(1, 10-phenanthroline)iron(II) in acid solution takes place according to the equation: Fe(phen)32+ + 3 H3O+

WARRIOR [948]

Answer:

50 degree centigrade

Explanation:

Please kindly check attachment for the step by step solution of the given problem.

3 0

3 years ago

Please please help!

ratelena [41]

The mass percent of potassium chloride is 1.386%

calculation

mass percent = actual mass/ Theoretical mass x 100

Actual mass = 9.35 g

Theoretical mass is calculated as below

Step 1 : write the equation for reaction

KCl + H₂O → KOH + HCl

Step 2: find the moles of H₂O

moles = mass÷ molar mass

The molar mass of H₂O = (2 x1 ) +(16) = 18 g/mol

moles is therefore = 162.98 g÷ 18 g/mol =9.054 moles

Step 3: use the mole ratio to determine the moles of KCl

KCl: H₂O is 1:1 therefore the moles of KCl is also = 9.054 moles

Step 4: find the theoretical mass of KCl

mass = moles x molar mass

from periodic table the molar mass of KCl = 39 +35.5 =74.5 g/mol

mass = 9.054 moles x 74.5 g/mol =674.5 g

Theoretical mass is therefore = 9.35 g/ 674.5 g x 100 = 1.386%

3 0

4 years ago

If 3.5 moles of nitrogen monoxide (NO) react with 6.0 moles of oxygen gas (O2), how many moles of the product can be formed and

jasenka [17]

Answer: -

4.25 mol of O₂ left as excess.

3.5 mol of NO₂ formed.

Explanation: -

Number of moles of NO taken = 3.5

Number of moles of O₂ taken = 6.0

The balanced chemical equation for this reaction is

2 NO+ O₂ → 2 NO₂

From the equation we can see that

2 mol of NO react with 1 mol of O₂

3.5 mol of NO react with $\frac{1 mol O2}{2 mol NO}$ x 3.5 mol NO

= 1.75 mol O₂

So Oxygen O₂ is in excess and NO is the limiting reagent.

Moles of O₂ left over = 6 - 1.75 =4.25 mol of O₂

From the balanced chemical equation we see

2 mol of NO gives 2 mol of NO₂

3.5 mol of NO gives $\frac2 mol NO2}{2 mol NO}$ x 3.5 mol NO

= 3.5 mol of NO₂

5 0

3 years ago

1.) C6H12O6 (aq) is a(an)?

Marina86 [1]

Answer:

1) D. Dissolved Molecule

2) C. 11.30 M

Explanation:

Q1:

Glucose (C₆H₁₂O₆) is a non-polar molecule.

When it is dissolved in water, it will be a dissolved molecule.

It can not be ionized in water.

So, the right choice is: D. Dissolved molecule.

Q2:

The molarity is the no. of moles of dissolved solute in a 1.0 L of the solution.

M = (n)solute (1000/V (mL) of the solution)

n of LiCl = 2.60 mol, V = 230.0 mL.

∴ M = (n)solute (1000/V (mL) of the solution) = (2.60 mol)(1000)/(230.0 mL) = 11.30 M.

8 0

3 years ago