Which of the following scenarios best describes separation by distillation?
A sample of ocean water is boiled in a glass flask. A solid remains in the flask, and a hot gas flows
into a cooling chamber. When the as cools enough, it condenses back into a liquid in a separate flask.
O a stip of paper with a sample of ink is placed in a jar. The liquid runs up the paper, resulting in
colored bars running up in a line.
O A funnel and porous paper are used to separate solids in a sample of dirty water from the liquid.
O Aliquid sample is spun quickly in a centrifuge. A layer of solid forms on the bottom of the test tube
over time.

Answer:

  (d)  1,320

Explanation:

You want the product 55.78 × 23.7 rounded appropriately.

When a number has both an integer part and a decimal fraction, all of the digits are significant. Here, that means the first number has 4 significant figures, and the second number has 3 significant figures.

The number of significant figures in a product or quotient will be the least of the numbers of significant figures of the contributors. Here, the product can only have 3 significant figures.

  55.78 × 23.7 = 1321.986 ≈ 1320 . . . . rounded to 3 sf

Using the rules for significant figures, the answer is 1320.

__

Additional comment

Generally, the rules for significant figures apply to quantities derived from measurements. They can also be applied to estimates, where the result of computation using numbers of different precision cannot have any more accuracy than the least precise contributor.

The other useful rule in this process is that the rounding is saved for the final answer. Intermediate results should be carried to the full precision available.

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mass of the sample gold= 38.6g

volume =

[tex]2 {cm}^{3} [/tex]

the density of the gold.

D = m/V

[tex]m = 38.6g[/tex]

[tex] = 0.0386kg[/tex]

[tex]v = 2 {cm}^{3} [/tex]

[tex] = 0.000002 {m}^{3} [/tex]

then substitute the values.

[tex]d = \frac{0.0386}{0.000002} [/tex]

[tex]d = 19300kg | {m}^{3} [/tex]

therefore, the density of the sample gold is 19300kg/m3

the volume of ammonia produced at STP.

Mass of hydrogen is 32.6g

Molar mass of H2 = 2 g/mol

Moles of H = 32.6g/2g/mol = 16.3mol

N2(g) + 3H2(g) —-> 2NH3(g)

The Mole ratio of H to NH3 is 3 : 1

32.6 mole of H = 1/3 x 16.3= 10.87 mol = 5.43mol

Moles of NH3 = 5.43mol

At STP moles = volume/molar volume, but molar volume = 22.4L/mol

Moles = volume/molar volume, volume = moles X molar volume

Volume = 5.43 mol x 22.4L/mol

= 121.63 L

Volume of NH3 = 121.63L

Conversion of 3-cyclopentylbutanal to a carboxylic acid will be made possible through oxidation.

This is the process in a chemical reaction which involves the gain of oxygen atoms.

3-cyclopentyl butanal  is oxidized to carboxylic acids using potassium dichromate(VI) solution which turns green in the presence of dilute sulfuric acid.

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The energy required to completely boil a 5.05 g-sample of liquid water at its boiling point is 2.73 kcal.

Boiling is the process in which, upon absorbing energy in the form of heat, a substance goes from the liquid state to the gaseous state.

We have a 5.05 g-sample of liquid water. We can calculate the heat required to completely boil it using the following expression.

Q = ΔH°vap × m

Q = 0.540 kcal/g × 5.05 g = 2.73 kcal

where,

The energy required to completely boil a 5.05 g-sample of liquid water at its boiling point is 2.73 kcal.

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Answer:

formation of an ester by condensation

Explanation:

Edge 2022

Looking at the reaction sequence as described in the question, the ester can be said to be formed by condensation.

A condensation reaction is one in which a new compound is formed by the loss of a small molecule such as water from the two reacting compounds.

Looking at the reaction sequence as described in the question, the ester can be said to be formed by condensation. Hydrogen ion is lost from the first compound and -OH from the second one which is an instance of condensation.

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Answer:

3.8 g

Explanation:

yan lng po maitutulong ko

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 2.34moles of potassium chloride will be produced from 175 g of potassium chlorate.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Mathematically,

mole =given mass ÷ molar mass

Molar mass of potassium chloride= 74.55 g/mol

Mass of potassium chloride= 175 g

Substituting the values in above formula we get

mole =175 g ÷  74.55 g/mol

moles of potassium chloride=2.34moles

Therefore, 2.34moles  of potassium chloride will be produced from 175 g of potassium chlorate.

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Answer:

1 kilogram of nuclear fuel

Explanation:

Answer:

1 Kilogram.

Explanation:

I took the test and I got an A. Really hope this helps you, friend!

Given the data from the question, the number of aluminum atoms in aluminum oxide, Al₂O₃ is 2 (Option B)

From the formula of the compound, Al₂O₃ we see that the compound is composed of

From the above, we can conclude that Al₂O₃ contains 2 atoms of aluminum.

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An ionic bond will be most likely formed between francium and chlorine having an electronegativity difference of 2.46.

An ionic bond is formed between to atoms that have a high difference in electronegativity between them. We now have to look out for the atoms that have a very high electronegativity difference. That pair is most likely to form an ionic bond.

Hence, an ionic bond will be most likely formed between francium and chlorine having an electronegativity difference of 2.46.

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Explanation:

The number of moles of a substance is represented by the following formula:

n=NNA

where, n

is the number of moles of the substance, N

is the total number of molecules present in a substance, andNA

is the Avogadro constant.

The given compound is N2O5

So one mole of N2O5

contains 6.023×1023

numbers of molecules. Thus the 0.400

moles of N2O5

contains a number of molecules => 0.400moles×6.023×10^23

.

=> 2.41×10^23 molecules.

there are 2.41 thats the anwser

Answer:

line 15 is were you can find the a then you look around for the r but as a heads up the m thats supposed to be there was actually inverted into a w in theory it must have been misprinted.

Explanation:

Answer:

.107 moles

Explanation:

To find moles given the info above, we use a variation of the Ideal Gas Law,

mol = PV/RT, where P is in atm, V is in L, T is in K, and R is the gas constant

mol= 3.47(.950) / 377(.08206)

Answer:

the alteration of limestone by heat and pressure.

Explanation:

Answer:

YES :)

Explanation:

How does marble turn back into Limestone?

»MARBLE is a Metharopic rock formed by the alternation of Limestone by heat and pressure

»The calcite in the limestone changes and fosills and layering in the original limestone disappear as interlocking grains grow.

»If the limestone is pure ,a white marble is formed

Answer:

H2(g) + F2(g) ----> 2HF(g)

Answer = F2

Answer:

See below ~

Explanation:

#1

Here the functional group attached is OH(Alcohol) so we need to use -ol suffix

Right hand side is 2 carboned substituent i.e it's ethyl group

Hence the naming is

#2

Start numbering from alcohol towards left end .

The name is

#3

O is at centre and two methyl groups are branched both sides

#4

O is at centre,left side propane ,right side methane

#5

Left side ethane,Centred O,Right side methyl.

Answer:

Your answer is B

Explanation:

For a gas containing 80% CH4 and 20% He is sent through a quart diffusion tube, the composition is mathematically given as

%He=12.5%

%CH4=87.5%

Generally, the equation for the Material balance  is mathematically given as

F=R+W

Therefore

100=0.20*1000+W

W=80kmol/min

In conclusion, waste gas compose

2.0/100*100=50/100*20+%*80

Hence

%He=12.5%

%CH4=87.5%

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Answer:

Earth covers a greater area in position A than in position B in the same amount of time.

Explanation:

Based on the diagram that shows different positions of Earth and Mars around the sun, it seems that this statement is correct:

Earth covers a greater area in position A than in position B in the same amount of time. (Covers as I understood it means "overshadowing" Mars)

Answer:

The correct formula for dinitrogen hexafluoride is Memorize the prefixes for number of atoms, Write the chemical symbol for the first element, add the number of atoms present as a subscript, Write the chemical symbol for the second element, Add the number of atoms present as a subscript, Practice with some examples.

Explanation:

1: Memorize the prefixes for number of atoms. In naming compounds, Greek prefixes are used to indicate the number of atoms present for each element. Covalent compounds are written out as molecular formulas due to the fact that each compound is a distinct, separate molecule.[1] Covalent compounds have the first element written out completely while the second element is named with the suffix "ide." For example, diphosphorus trisulfide has a chemical formula of P2S3. Below are the prefixes for 1-10:

1: Mono-

2: Di-

3: Tri-

4: Tetra-

5: Penta-

6: Hexa-

7: Hepta-

8: Octa-

9: Nona-

10: Deca-

2: Write the chemical symbol for the first element. When a compound has been written out, you must identify the elements and know their chemical symbols. The first element written is "first name" of the compound. Use the periodic table to find the chemical symbol for the element. For example: Dinitrogen hexafluoride. The first element is nitrogen and the chemical symbol for nitrogen is N.

3: Add the number of atoms as a subscript. To identify the number of atoms present for each element, you simply need to look at the prefix of the element. Memorizing the Greek prefixes will help you to be able to write chemical formulas quickly without looking anything up. For example: Dinitrogen has a the prefix "di-" which means 2; therefore, there are 2 atoms of nitrogen present. Write dinitrogen as N2.

4: Write the chemical symbol for the second element. The second element is the "last name" of the compound and will follow the first element. For covalent compounds, the element name will have a suffix of "-ide" instead of the normal ending of the element. For example: Dinitrogen hexafluoride. The second element is fluorine. Simply replace the "ide" ending with the actual element name. The chemical symbol for fluorine is F.

5: Add the number of atoms present as a subscript. As you did with the first element, identify the number of atoms present in the second element by reading the prefix. Using this prefix, write the number of atoms as a subscript to the right of the chemical symbol. For example: Hexafluoride has a prefix of "hexa-" which means 6; therefore, there are 6 atoms of fluorine present. Write hexafluoride as F6. The final chemical formula for dinitrogen hexafluoride is N2F6.

6: Practice with some examples. When first learning chemistry, there is a lot of memorization involved. It is kind of like learning a new language. The more examples you practice with, the easier it will be to decipher chemical formulas in the future and learn the language of chemistry. Sulfur dioxide: SO2 Carbon tetrabromide: CBr4 Diphosphorus pentoxide: P2O5

Answer:

The R-O-R Chain

Explanation:

Please give me brainliest! Im so sorry if this is incorrect I really tried... -_- ;-;

Answer:

B.6

Explanation:

Organism is at the top and does not get eaten by anything else. That is why I think the correct answer is b :)

Have an amazing day!!

Please rate and mark brainliest!

The moles of NaOH used in the titration would be 0.00177 moles while the molarity of the vinegar will be 0.885 M

Recall that: mole = molarity x volume

In this case, the molarity of the NaOH= 0.1 M

Volume of NaOH = 17.7 - 0.0 = 17.7 mL

Mole of NaOH used = 0.1 x 17.7/1000 = 0.00177 moles.

Since NaOH and vinegar have 1:1 mole ratio, the mole of vinegar will also be 0.00177 moles.

Molarity of vinegar = mole/volume = 0.00177/0.002 = 0.885 M

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Answer:

M = [tex]\frac{3}{5}[/tex] or 0.60 M

Explanation:

Data:

Wanted:

Equation:

Solution:

Note:

The answer is not in a correct significant figure.

The quantity of water in mL that was added to make the solution is 170 mL (option C)

M₁V₁ = M₂V₂

9 × 10 = 0.5 × V₂

90 = 0.5 × V₂

Divide both side by 0.5

V₂ = 90 / 0.5

V₂ = 180 mL

Volume of water added = V₂ – V₁

Volume of water added = 180 – 10

Volume of water added = 170 mL

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Answer:

.5 kg

Explanation:

At the start of Uranium-235 there is a total of 1 kg. Uranium-235 half life is 700 million years, take 1kg ÷2 = 0.5kg after 1 half life.

Let's say another 700 million years go by that means you take 0.5kg and divide that by 2.

0.5kg÷2= 0.25 kg is left after 2 half lives.

Hope this helps good luck!

Answer:

picture

Explanation:

i need the picture

we need a picture to

answer this sire

The new temperature of the bromine gas as the tank is expanded to the given volume and pressure is 500.96 Kelvin.

Combined gas law put together both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that "the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.

It is expressed as;

P₁V₁/T₁ = P₂V₂/T₂

Given the data in the question;

To calculate the new temperature the gas, we subtsitute our given values into the expression above.

P₁V₁/T₁ = P₂V₂/T₂

P₁V₁T₂ = P₂V₂T₁

T₂ = P₂V₂T₁/P₁V₁

T₂ = ( 8.0atm × 100L × 340.15K ) / ( 5.6atm × 97L )

T₂ = 272120LatmK / 543.2Latm

T₂ = 500.96K

Therefore, the new temperature of the bromine gas as the tank is expanded to the given volume and pressure is 500.96 Kelvin.

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Answer:

Disagree carbon dioxide is one of the most important elements as it is present in nearly everywhere in our environment. We are also made from carbon. Carbon dioxide is present in our oceans. It is the most stable element in the periodic table therefore all element are compared to carbon-12 to calculate the relative mass of it from the element's isotopes. It is so important that a slight increase of CO2 production and other greenhouse gas production has the Earth become warmer causing it to have drastically impact our environment and also affecting our future.

In an ecosystem ,carbon dioxide is important so as to maintain the carbon foot prints.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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