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3 years ago

Which has more energy, low or high frequency electromagnetic radiation?

Chemistry

2 answers:

hammer [34]3 years ago

5 0

Energy increases with increasing frequency.

mafiozo [28]3 years ago

5 0

The correct answer is high frequency electromagnetic radiation. Hope this helps.

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To run a spectrophotometry experiment, begin by _______ the spectrophotometer and preparing the samples. Be sure to select the c

12345 [234]

Answer:

b) warming up a) wavelength a) blank c) sample

Explanation:

To run a spectrophotometry experiment, begin by warming up the spectrophotometer and preparing the samples. It is important that the equipment is warmed up for at least 30 minutes before starting the measurements.

Be sure to select the correct wavelength, then run a measurement on the blank solution. The selected wavelength depends on the analyte of interest. The black solution contains the same matrix but it doesn´t contain the analyte.

Follow up by running measurements on sample solutions. Once data is collected, turn off the instrument, clean the area, and discard the samples. The samples are those of unknown concentration that we want to determine.

8 0

3 years ago

How many grams of Fe2O3 are formed when 16.7 moles of Fe reacts completely with

lesantik [10]

Answer:

The answer to your question is 1) 1336 g of Fe₂O₃ 2) 1 mol of H₃PO₄

Explanation:

Data

mass of Fe₂O₃ = ?

moles of Fe = 16.7

Balanced chemical reaction

4Fe + 3O₂ ⇒ 2Fe₂O₃

a.- Calculate the moles of Fe₂O₃

4 moles of Fe ----------------- 2 moles of Fe₂O₃

16.7 moles of Fe -------------- x

x = (16.7 x 2)/4

x = 33.4/4

x = 8.35 moles of Fe₂O₃

b.- Calculate the molar mass of Fe₂O₃

Fe₂O₃ = (2 x 56)+ (3 x 16) = 112 + 48 = 160 g

c.- Convert moles to mass

160 g of Fe₂O₃ ------------ 1 mol

x ------------ 8.35 moles of Fe₂O₃

x = (8.35 x 160)/1

x = 1336 g of Fe₂O₃

moles of H₃PO₄ = ?

mass of P₄O₁₀ = 71 g

Balanced chemical reaction

P₄O₁₀ + 6H₂O ⇒ 4H₃PO₄

a.- Calculate the molar mass of P₄O₁₀

P₄O₁₀ = (31 x 4) + (16 x 10) = 124 + 160 = 284 g

b.- Convert the mass of P₄O₁₀ to moles

284 g ------------------- 1 mol

71 g -------------------- x

x = (71 x 1)/284

x = 0.25 moles of P₄O₁₀

c.- Calculate the moles of H₃PO₄

1 mol of P₄O₁₀ ---------------- 4 moles of H₃PO₄

0.25 moles ----------------- x

x = (0.25 x 4) / 1

x = 1 mol of H₃PO₄

3 0

3 years ago

A given volume of methane diffuses in 20 seconds. How long will it take the same volume of hydrogen to diffuse under the same co

Airida [17]

The time taken for the same volume of methane gas to diffuse is 7.1 s.

<h3>Rate of gas diffusion</h3>

The rate at which a given mass of diffuses is inversely proportional to the molar mass of the gas.

$\frac{t_2}{t_1} = \sqrt{\frac{M_2}{M_1} }$

where;

M1 is the molar mass of methane (CH4) = 16 g
M2 is the molar mass of hydrogen as = 2
t1 is time taken for methane = 20 s
t2 is the time taken for hydrogen = ?

$\frac{t_2}{t_1} = \sqrt{\frac{M_2}{M_1} }\\\\\frac{t_2}{20} = \sqrt{\frac{2}{16} }\\\\\frac{t_2}{20} = \frac{\sqrt{2} }{4} \\\\t_2 = \frac{20\sqrt{2} }{4} \\\\t_2 = 5\sqrt{2} \\\\t_2 = 7.1 \ s$

Thus, the time taken for the same volume of methane gas to diffuse is 7.1 s.

Learn more about rate of gas diffusion here: brainly.com/question/26696466

6 0

2 years ago

Read 2 more answers

What is the best definition of weight

LenKa [72]

Answer:

a body's relative mass or the quantity of matter contained by it, giving rise to a downward force; the heaviness of a person or thing.

really depending on what weight you are referring to but thats the number 1 on dictonary

7 0

2 years ago

Read 2 more answers

You are given a mixture of sand, sugar and sulphur. Give the method you will use to separate the three constituents. ___________

tatyana61 [14]

Answer:

1:put these in sneaker and add water since sulphur is insoluble and the sugar will dissolve and the sand will settle obtain the sulphur

2:filter the mixture of sand and sugar solution to obtain the sand as residue and solution as filtrate

3:using an evaporating dish evaporate sugar solution to saturation not dryness to get crystals.

6 0

3 years ago