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Paha777 [63]
3 years ago
9

Explain what a cold front is.

Chemistry
1 answer:
aleksley [76]3 years ago
3 0

Answer:

A cold front is a boundary or zone that separates two air masses. The cooler more dense mass replaces the warmer.

hope this helps :)

Explanation:

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A sample of nitrogen gas has a volume of 237mL at 9.86atm. What is the new
MrRa [10]

Answer:

The new  volume of the gas when the pressure is changed to 2.84 atm is 822.82 mL.

Explanation:

Boyle's law says that "The volume occupied by a given gaseous mass at constant temperature is inversely proportional to pressure." That is, if the pressure increases, the volume decreases, while if the pressure decreases, the volume increases.

Boyle's law is expressed mathematically as:

Pressure * Volume = constant

or

P * V = k

Assuming that you have a certain volume of gas V1 that is at a pressure P1 at the beginning of the experiment, by varying the volume of gas to a new value V2, then the pressure will change to P2, and it will be fulfilled:

P1*V1=  P2*V2

In this case:

  • P1= 9.86 atm
  • V1= 237 mL
  • P2= 2.84 atm
  • V2=?

Replacing:

9.86 atm* 237 mL= 2.84 atm*V2

and solving you get:

V2=\frac{9.86 atm* 237 mL}{2.84 atm}

V2= 822.82 mL

<u><em>The new  volume of the gas when the pressure is changed to 2.84 atm is 822.82 mL.</em></u>

3 0
3 years ago
Naturally occurring copper is composed of 69.2% of 63Cu and 30.8% of 65Cu. Atoms of 63Cu have a mass of 62.9296 u and those of 6
geniusboy [140]

Answer:

The answer to your question is: 63.5 u

Explanation:

Data                  Percent                         Molecular mass

63 Cu               69.2%                             62.9296 u

65Cu                 30.8%                             64.9278 u

Average atomic mass = ?

Formula

Average atomic mass = (0.692 x 62.9296) + (0.308 x 64.9278)

                                     = 43.55 + 19.99

                                      = 63.5 u

8 0
3 years ago
Creatinine, , is a by-product of muscle metabolism, and creatinine levels in the body are known to be a fairly reliable indicato
kherson [118]

Answer:

Molality = 0.0862 mole/kg

Explanation:

Molality = (number of moles of solute)/(mass of solvent in kg)

Number of moles of solute = (mass of Creatinine in the blood sample)/(Molar mass of Creatinine)

To obtain the mass of creatinine in 10 mL of blood. We're told that 1 mg of Creatinine is contained in 1 decilitre of blood.

1 decilitre = 100 mL

1 mg of Creatinine is contained in 100 mL of blood

x mg of Creatinine is contained in 10 mL of blood.

x = (1×10/100) = 0.1 mg = 0.0001 g

Molar mass of Creatinine (C₄H₇N₃O) = 113.12 g/mol

Number of moles of Creatinine in the 10 mL blood sample = (0.0001/113.12) = 0.000000884 moles

Mass of 10 mL of blood = density × volume = 1.025 × 10 = 10.25 mg = 0.01025 g = 0.00001025 kg

Molality of normal creatinine level in a 10.0-ml blood sample = (0.000000884/0.00001025)

Molality = 0.0862 moles of Creatinine per kg of blood.

Hope this Helps!!!

7 0
3 years ago
A 1 liter solution contains 0.304 M acetic acid and 0.228 M sodium acetate. Addition of 0.114 moles of perchloric acid will:____
Papessa [141]

Answer:

Lower the pH slightly

Explanation:

A buffer is defined as the mixture between weak acid and conjugate base. In the problem, acetic acid is the weak acid and sodium acetate the conjugate base.

When a strong acid as perchloric acid is added to a buffer, <em>the pH decreases slightly</em> because the acid reacts with conjugate base producing weak acid and not affecting directly the concentration of H⁺ ions.

5 0
3 years ago
Which type of electromagnetic radiation has a lower frequency than infrared radiation?
levacccp [35]

Answer:

visible light

...........

5 0
3 years ago
Read 2 more answers
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