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Jet001 [13]
3 years ago
15

What are some of the problems with using flame tests as a way to identify substances?

Chemistry
1 answer:
ASHA 777 [7]3 years ago
3 0
Different substances can produce similar results in color. This can cause <span>uncertainty with identifying the substance.</span>
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HELP ASAP!! PLZ
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D. The empirical formula and the molar mass

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Anni [7]
B water at 99c since it is the hottest
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The mass of 322 mL of hydrogen gas at 4.0 atm and –73°C is 1.21 grams. What is the density of hydrogen gas at STP?
Andrews [41]
To be able to answer this item, we assume that the given hydrogen gas is ideal such that we are able to use the Ideal Gas equation,
                               PV = nRT
At STP, the values of volume, pressure, and temperature are 22.4 L, 1 atm, and 273.15 K. Solving for n,
                              n = (1 atm x 22.4 L) / (0.0821 L.atm/mol K x 273.15 K)
                                                  n = 0.9988 mols
Each mol of hydrogen gas is 2 g.
                                                 m = (0.9988 mols) x (2 g/1 mol)
                                                   m = 1.9977 g
Density is the quotient of mass and volume,
                           density = 1.9977 g/ 22400 mL
                            density = 8.92 x 10^-5 g/mL
7 0
3 years ago
Which characteristic is true of sexual reproduction but not of asexual reproduction?
Marianna [84]

Answer:

j one or more parents. that's the answer

7 0
3 years ago
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A student who is performing an experiment must measure out 0.02-mL of 0.50-M HCl. The most accurate piece of equipment to measur
marta [7]

Answer:

Choice D) 1 mL pipet

Explanation:

If you are trying to extract 0.02 mL of HCl, you are going to need a piece of equipment that can measure very small units. Thus, Choice D would be the correct answer.

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3 years ago
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