What is 850 torr= ? Atm

Answers

Answer 1

Answer: 850 torr. times 1 atm./760 torr. or 850/760. So, 1.11842105 atm.

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A sample of hydrogen gas is collected over water at 25°C. The vapor pressure of water at 25°C is 23.8 mmHg. If the total pressure is 523.8 mmHg, what is the partial pressure of the hydrogen?

Answers

The partial pressure of the gas will be the total pressure minus the vapor pressure. 523.8-23.8=500mmHg. This makes sense due to the fact that the idea of partial pressures still works even with vapor pressure since vapor pressure is just the partial pressure of water vapor (23.8mmHg) in the container which is added to the partial pressure of hydrogen gas (500mmHg) to make a total pressure of 523.8mmHg.
I hope this helps. Let me know in the comments if anything is unclear.

Exactly how much time must elapse before 16 grams of potassium-42decays, leaving 2 grams of the original isotope?(1) 8 × 12.4 hours (3) 3 × 12.4 hours(2) 2 × 12.4 hours (4) 4 × 12.4 hours

Answers

The answer is (3) 3 × 12.4 hours

To calculate this, we will use two equations:
$(1/2) ^(n) =x$
$t_(1/2) = (t)/(n)$
where:
n - number of half-lives
x - remained amount of the sample, in decimals
$t_(1/2)$ - half-life length
t - total time elapsed.

First, we have to calculate x and n. x is remained amount of the sample, so if at the beginning were 16 grams of potassium-42, and now it remained 2 grams, then x is:
2 grams : x % = 16 grams : 100 %
x = 2 grams × 100 percent ÷ 16 grams
x = 12.5% = 0.125

Thus:
$(1/2) ^(n) =x$
$(0.5) ^(n) =0.125$
$n*log(0.5)=log(0.125)$
$n= (log(0.5))/(log(0.125))$
$n=3$

It is known that the half-life of potassium-42 is 12.36 ≈ 12.4 hours.
Thus:
$t_(1/2) = 12.4$
$t_(1/2) *n = t$
$t= 12.4*3$

Therefore, it must elapse 3 × 12.4 hours before 16 grams of potassium-42 decays, leaving 2 grams of the original isotope

Answer:

The answer is (3) 3 × 12.4 hours

Hard water contains calcium and magnesium, which undergo oxidation andclog water pipes. Which statement best describes this change as a chemical change?

A.Calcium and magnesium dissolve in water.

B.Calcium and magnesium evaporate on contact with the walls of the pipe.

C.Calcium and magnesium form precipitates of their respective oxides.

Answers

It's C, calcium and magnesium form precipitates of their respective oxide

Final answer:

The statement 'Calcium and magnesium form precipitates of their respective oxides' best describes the chemical change as it involves a reaction that transforms the calcium and magnesium into new compounds, their oxides, which can clog pipes.

Explanation:

The statement that best describes this change as a chemical change is C. Calcium and magnesium form precipitates of their respective oxides. This represents a chemical change because it involves a reaction that transforms the calcium and magnesium into new substances - their oxides. Here's how it works: in the presence of oxygen, calcium and magnesium in hard water can undergo an oxidation process. During this oxidation, the calcium becomes calcium oxide and the magnesium becomes magnesium oxide. These oxides are less soluble in water and form precipitates, which can accumulate and clog the pipes.

Learn more about Chemical change here:

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Which type of molecule is produced during photosynthesis A.monosaccharide
B.triglyceride
C.protein
D.Polypeptide

Answers

Answer

monosaccharide

Explanation

What are the products when anaerobic respiration occurs in yeast cells? Carbon dioxide, water, and energy

Carbon dioxide, ethanol, and energy

Lactic acid and energy

Glucose, oxygen, and energy

Answers

The correct answer is the second option. Anaerobic respiration is a type of respiration which involves the use of electron acceptors other than oxygen. This is respiration without using oxygen. An example is alcohol fermentation where the the reactants are glucose and enzymes forming to products which are CO2, ethanol and energy.

carbon dioxide, water, and ATP

How is the number of neutrons and in nucleus of an atom calculated

Answers

Explanation:

Atomic number is defined as the sum of total number of protons present in an atom. Each element has different atomic number.

Whereas mass number is the sum of total number of both protons and neutrons present in an element.

For example, an atom with mass number as 15 and has atomic number 7. Then it means it has 7 protons.

Therefore, number of neutrons present in it will be calculated as follows.

Mass number = no. of protons + no. of neutrons

15 = 7 + no. of neutrons

no. of neutrons = 15 - 7

= 8

Thus, we can conclude that the number of neutrons is calculated as mass number minus total number of protons present in the atom.

The number of neutrons in an atoms nucleus can be calculated by subtracting the atomic number of that atom from its mass number.

$(mass number - atomic number = number of neutrons)$

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