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Andrei [34K]
3 years ago
13

A 50 ml volumetric flask is calibrated to the _______ and will hold exactly _________ when filled to the calibration line: 0.01

ml, 100.00 ml 0.01 ml, 50.00 ml 0.01 ml. 50.000 ml 0.01 ml, 50.0 ml 0.1 ml, 50.00 ml 0.1 ml, 50.0 ml 0.1 ml, 50 ml
Chemistry
2 answers:
tensa zangetsu [6.8K]3 years ago
7 0
<h2>Answer : Option B) 0.01 mL, 50.00 mL</h2><h3>Explanation :</h3>

A 50  mL volumetric flask is calibrated to the <u>0.01 mL</u> and will hold exactly <u>50.00 mL </u> when filled to calibration line.

Every volumetric flask is calibrated with 0.01 mL so that when the liquid is filled till the calibration line the flask should hold 50.00 mL fluid in it. It gives precise and accurate measurements for the experiments. Calibration is a must for every glassware which ensures less experimental errors.

artcher [175]3 years ago
5 0

Answer;

0.1 mL, 50.00 mL

A 50 ml volumetric flask is calibrated to the 0.1 mL and will hold exactly 50.00 mL when filled to the calibration line.

Explanation;

A volumetric flask is a piece of laboratory glassware, a type of laboratory flask, calibrated to contain a precise volume at a particular temperature. Volumetric flasks are used for precise dilutions and preparation of standard solutions.

Calibration is a comparison between a known measurement (the standard) and the measurement using your instrument. The accuracy of the standard should be ten times the accuracy of the measuring device being tested.

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If 3.91 moles of H2 were used, how many moles of NH3 would be made?<br><br> HELP PLEASE ASAP
matrenka [14]

N + H2 → NH3

balance the equation

2N + 3H2 → 2NH3

3H2 → 2NH3

3 : 2

3.91 ÷ 3 = 1.303 mol

1.3 × 2 = 2.606 mol

7 0
3 years ago
Which explains why mixtures can be separated?
Elza [17]

Answer:

A

Explanation:

In chemistry, a mixture is a material made up of two or more different substances which are not chemically combined. A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions, and colloids.

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3 years ago
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Why do the Noble gases have the highest ionization energies across a period?
Kitty [74]

Answer:

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Explanation:

3 0
3 years ago
sanitary pads and diapers contain higher phthalate contents than those in common commercial plastic products
Vitek1552 [10]

The correct answer is because sanitary pads and diapers are in direct contact with external genitalia for an extended period of time, a significant amount of VOCs or phthalates may be absorbed into the reproductive system.

Sanitary pads and diapers are made of synthetic plastic materials that can leach into the environment when used. The amounts of volatile organic compounds (VOCs) (methylene chloride, toluene, and xylene) and phthalates (DBP, DEHP, DEP, and BBP) found in sanitary pads and diapers were measured in this study. VOC and phthalate concentrations in sanitary pads varied by 5,900 and 130 times, respectively. VOC and phthalate concentrations in diapers varied by three and sixty-three times between brands. The VOC concentrations in sanitary pads and diapers were comparable to those in residential air. However, sanitary pads and diapers had significantly higher phthalate concentrations than common commercial plastic products.

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6 0
2 years ago
how many liters of carbon dioxide are produced at STP when 295g or propane gas (C3H8) is reacted with excess oxygen? the other p
LiRa [457]
<span>The balanced equation is: C3H8 + 5 O2 = 3 CO2 + 4 H2O

</span>1) first step is to<span> determine the molar mass you have to consult the periodic table and see the atomic mass of each element. If the element is repeated, for example 3 times, you multiple the atomic mass per 3.
C3H8= 12 x 3 + 1*8
= 44 g/mol

2)convert grams to moles so that everything will be in same unit.</span>
<span>moles are calculated by dividing mass by molar mass.
moles of C3H8= 295g / 44 g/mol
= 6.705 mol

3)By looking at the balanced equation, you can see that 1 mol of C3H8 will produce 3 moles of CO2. So if you have 6,705 moles, you will  obtain x moles of CO2:
1 C3H8--------3 CO2
6,705----------x  of CO2
x= 20,115 mol of CO2
</span>
4) At STP(<span>Standard Temperature and Pressure)</span> 1 mole of gas is equivalent to 22.4 liters.
1 mol of CO2-----22,4
20,115 -------------x liters
x= 20,115 x 22,4 =
450,6 liters.

7 0
3 years ago
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