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Archy [21]
3 years ago
11

What precautions must be taken when mixing reagents in a separatory funnel or a centrifuge tube?

Chemistry
1 answer:
N76 [4]3 years ago
5 0

When you are mixing reagents in a separatory funnel it is important to vent it normally and do so in a method so that is it is not venting towards anybody. Also be certain to take out the stopper when draining the lower layer. If you do not take out the stopper, the pressure will not be correct, and the liquid will not pour out.

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The bond enthalpy of the Br–Cl bond is equal to ΔH°rxn for the following reaction. BrCl(g) → Br(g) + Cl(g) Using the follo
ddd [48]

Answer:

a. Br2 (l) → Br2(g) ΔH°rxn = 30.91 kJ/mol

Explanation:

Bond enthalpy is the energy which is required to break 1 mol of of bonds in gaseous covalent molecules. Bond breaking process can be endothermic or exothermic depending on the molecules association. The process needs to be performed in chemical laboratory under standard conditions.

3 0
3 years ago
As a step O3 0.020 mol to gr
White raven [17]
Molar mass:

Atomic mass O = 16.0 a.m.u

O₃ = 16.0 x 3 => 48.0 g/mol

Therefore:

1 mole O₃ --------------- 48.0 g
0.020 mole O₃ ---------- ??

0.020 x 48.0 / 1 =

0.96 / 1 => 0.96 g 

hope this helps!
5 0
4 years ago
The specific heat capacity of lead is 0.13 J/g-K. How much heat (in J) is required to raise the temperature of 15 g of lead from
Alona [7]

Answer:

c. 29 J

Explanation:

Step 1: Given data

  • Specific heat capacity of Pb (c): 0.13 J/g.K (= 0.13 J/g.°C)
  • Mass of Pb (m): 15 g
  • Initial temperature: 22 °C
  • Final temperature: 37 °C

Step 2: Calculate the temperature change

ΔT = 37 °C - 22 °C = 15 °C

Step 3: Calculate the heat (Q) required to raise the temperature of the lead piece

We will use the following expression.

Q = c × m × ΔT

Q = 0.13 J/g.°C × 15 g × 15 °C = 29 J

6 0
3 years ago
Which element has a complete valence electron shell?
Norma-Jean [14]
The element that has a complete valence electron shell is argon (Ar) since it is a noble gas in the last group on the periodic table.
8 0
3 years ago
Read 2 more answers
Homes in rural areas where natural gas service is not available often rely on propane to fuel kitchen ranges. The propane is sto
Neporo4naja [7]

Answer:

2666.7 hours

Explanation:

The key to solve this problem is that we are given the propane gas consumed in one hour by giving us the information of the volume consumed at 1 atm, 298 K (25 +273). Using the gas law we can calculate the rate of consumption  of propane per hour, and from here we can calculate its mass and converting it to gallons and finally diving the 400 gallos by this number.

PV = nRT ∴ n = PV/RT

n = 1 atm x 165 L/ (0.08206 Latm/kmol x 298 K ) = 6.75 mol propane

Mass propane :

6.75 mol x 44 g/mol = 296.88 g

convert this to Kg:

296.88 g/ 1000 g/Kg = 0.30 Kg

calculate the volume in liters this represents by dividing by the density:

0.30 Kg / 0.5077 Kg/L =  0.59 L

changing this to gallons

0.59 L x  1 gallon/3.785 L = 0.15 gallon

and finally calculate how many hours the 400 gallons propane tank will deliver

400 gallon/ 0.15 gallon/hr = 2666.7 hr

6 0
3 years ago
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