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Tcecarenko [31]
4 years ago
14

How can atoms have more than 32 electons?

Chemistry
1 answer:
guajiro [1.7K]4 years ago
3 0
86 atoms have more electrons than Germanium
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What is NaCI and what is KBr?
Rufina [12.5K]
NaCl= sodium chloride or salt
KBr= potassium bromide
3 0
3 years ago
What is responsible for the whistling sound that often accompanies fireworks?
liq [111]
The crackling sound Is mainly to do with chemistry, The fireworks are filled with lead oxide, which turns into lead atoms as the firework explodes and heat up—— whistling sounds, the whistle is down to the tube being narrow one, thus rockets make a whistling noise
6 0
3 years ago
What is the enthalpy change (in kJ) of a chemical reaction that raises the temperature of 250.0 ml of solution having a density
stellarik [79]

Answer:

328.4KJ

Explanation:

Before we move on to calculate enthalpy change, we calculate the amount of heat Q

Q= mcΔT

m = density * volume = 250 * 1.25 = 312.5g

c = 3.74J/g.k

ΔT = 7.80 + 273.15K = 280.95K

Q= 312.5 * 3.74 * 280.95 = 328,360.312 J= 328.4KJ(1000J = 1KJ, so divide by 1000)

The enthalpy change in the reaction is same as amount of heat transferred = 328.4KJ

3 0
4 years ago
The solubility of solid W in water is: 1.72 g/100 mL at 0°C, 21.3/100 mL at 100°C. a) How many mL of boiling water are required
grandymaker [24]

Answer:

a) Mass of solid W crystallized out 0°C is 141.564 g

b) 91.92% is the percent recovery.

Explanation:

The solubility of solid W in water at 100°C = 21.3 g/100 mL

Volume of water at 100C required to dissolve 154.0 g of W: x

\frac{154.0 g}{x}=\frac{21.3 g}{100 mL}

x=\frac{154.0 g\times 100 mL}{21.3 g}=723.0 mL

723.0 mL of water will dissolve 154.0 grams of solid W.

The solubility of solid W in water at 0°C = 1.72 g/100 mL

Mass of W soluble in 723.00 mL of water at  0°C = m

\frac{m}{723.0 mL}=\frac{1.72 g}{100 mL}

m=\frac{1.72 g\times 723.0 mL}{100 mL}=12.436 g

a) Mass of solid W crystallized out 0°C : 154.0 g- 12.436 g=141.564 g

b)  Percent recovery of solid at 0°C:

\frac{141.564 g}{154.0 g}\times 100=91.92\%

91.92% is the percent recovery.

5 0
3 years ago
What is electrophoresis​
RUDIKE [14]

Answer:

electrophoresis is the movement of charged particles in a fluid (or it could also be a gel) under the control of a electric field

7 0
3 years ago
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