2 Points
You are a forensic scientist working for a police department. One piece
of evidence from your current case is a letter written in a strange ink. You
must separate the pigments in the ink to determine what it is made from.
What procedure should you use?
A. Distillation
O
B. Evaporation
C. Filtering
d
d
D. Chromatography
Reset Selection

Answers

Answer 1
The answer is D. Chromatography

Do you is the correct answer because chromatography refers to the science of splitting mixtures to identify what they’re made of. I hope this helps.

Related Questions

mixture of 75 cm3of oxygen and 12.5 cm3 of a gaseous hydrocarbon H were exploded in an eudiometer. After cooling to room temperature, 50 cm3 of gas was left and when this was shaken with KOH solution, 12.5 cm3 of oxygen remained. Given that all the volumes were measured at same temperature and pressure, calculate the molar mass of the hydrocarbon H.

Answers

Answer:

molar mass of C₃H ₈ = 44 g/mole

Explanation:

Computation of the amount of oxygen that reacts .

⇒ 75 - 12.5

⇒ 62.5 cm³

Computation of  proportion of hydrocarbons

2 mole hydrocarbons 3n+1 oxygen

⇒ 3 n + 1 = [62.5 × 2] / 12.5

⇒ 3 n + 1 = 10

⇒ n = 3

So,

Formula of the hydrocarbon is C₃H ₈

Computation of molar mass of C₃H ₈

⇒ [12×3] + [1×8]

⇒ 44 g/mole

how many grams of H20 will be produced by 18g H2

Answers

Answer:

160.86 g to the nearest hundredth.

Explanation:

H2 + O  ---> H2O

2.016 g H2 produces 18.016 g H2O

1g      ..    ..   ..   ..   ..    18.016 / 2.016 g H2O

18g   ..   ..   ..  ..  .. . .     (18.016 * 18) / 2.016 g H2O.

= 160.86 g.

Heptane, pentane and octane are accidentally mixed. They all have different boiling points. Pentane boils at 360 ° C, hexane boils at 690 ° C and octane boils at 12 ° C. What method would you use to separate these liquids? Explain how the method works.

Answers

Answer:

Fractional distillation

Explanation:

Heat the mixture upto 700°C

The compuond with low boiling point will evaporate first and the compound with higher boiling point will evaporate last.

hey so for science class im making a brochure for a vacation to mars.
can someone give me a good name and theme for a hotel that would be on mars?

Answers

Answer:

The name of the hotel can be the Red dust hotel. And the theme could red and rocky

Explanation:

hi:)) how to do 5? I’m not sure if it’s hydrogen carbonate or carbonate

Answers

Answer:

copper(ll) carbonate

Explanation:

Since the product is a salt which is copper(II) carbonate, water and carbon dioxide, this reaction is an acid + metal carbonate reaction.

Looking at the salt, Cu²⁺ has to be part of the reactants.

Hence, the missing compound there has to be copper(ll) carbonate, CuCO₃.

The balanced chemical equation would be:

CuCO₃ + 2HNO₃➙ Cu(NO₃)₂ +H₂O +CO₂

P.s. You left out CO₂ as a product in Q2 ;)

Just a recap of the main reactions you would've learnt:

1) Acid + base/ alkali ➙ salt + water

2) Acid + metal ➙ salt + hydrogen gas

3) Acid + metal carbonate ➙ salt + H₂O + CO₂

Pls help I’m dying plssssssdsssss

Answers

Answer:

number 3

Explanation:

the answer is the third one

In the reaction:
CO3²- + H+ --> HCO³-
The CO3²- ion is considered a base because it
1) accepts a proton
2) accepts an electron
3) donates a proton
4) donates an electron
Thanks! :)

Answers

Answer:

1) accepts a proton

Explanation:

CO₃⁻²  is a base here because it is accepting a proton ( H⁺) through coordinate bonding by donating a pair of electron .

So option (1) is correct .

0.5 g of salt is dissolved in 25 g of water. Calculate the percentage amount of salt in the solution.

Answers

Total mass = 0.5+25=25.5
0.5/25.5 x 100 = 1.96
Salt percentage = 1.96%

When 100 g of 20°C water is mixed with 50 g of 50°C water in a closed system, what is the final water

temperature?

A 20°C

B) 30°C

C) 35°C

D50°C

Answers

The answer is letter B

The final temperature of a mixture of 100g of water at 20°C and 50g of water at 50°C is 30°C.

What is the principle of method of mixtures ?

The amount of heat lost by the hotter sample = The amount of heat gained by the cooler water sample

The amount of heat gained by the cooler water sample is: -

Q1₁= m₁c(T – T₁)

The amount of heat lost by the hotter water sample is: -

Q₂ = m₂c(T₂ - T)

Q₁ = Q₂

m₁c(T – T₁) = m₂c(T₂ - T)

T = (m₁T₁ + m₂T₂)/(m₁+ m₂)

Let the final temperature of the mixture of 100g of water at 20°C and 50g of water at 50°C be T.

m₁ = 100g

T₁ = 20°C

m₂ = 50g

T₂ = 50°C

The final temperature of water = (100*20+50*50)/(100+50)

= (2000+2500)/(150)

=4500/150

=30°C

Therefore , the final temperature of a mixture of 100g of water at 20°C and 50g of water at 50°C is 30°C.

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.
Showing a correct numerical setup, determine the percent composition by mass of carbon in baking soda (gram-formula mass - 84 grams per mole).

Answers

Answer:

Percentage Mass carbon = 14.3%

Explanation:

Baking soda which is sodium hydrogen bicarbonate has the molecular fomula, NaHCO3.

Atomic masses of each of the component atoms is, Na = 23; H = 1; C = 12; O = 16

Step 1: Molar mass of NaHCO3 = 23 + 1 + 12 + 3*16 = 84 g/mol

Step 2: Percentage mass of Carbon = (atomic mass of Carbon / molar mass of NaHCO3) * 100%

= (12 / 84) *100%

Percentage Mass of carbon = 14.3%

A substance that is made up of more than one atom is called _____.

Answers

Answer:

It is called a compound.

Explanation:

Guys, please help me and tell me how you found the answer!

If a gas has a pressure of 1.69 atm at a temperature of 300 K, what will the pressure change to if the container is cooled to 100 K?

Also


If a gas has a pressure of 715 mm Hg at the temperature of 500 K, what will the pressure change to if the container is heated to 900 K?

Answers

Answer:

The First one is: 0.563atm

The second one is: 1.692atm

Hope this helps!

Explanation: Look at Photo Attached

The pressure has been reduced with the cooling of the container, and the change in pressure has been 1.06 atm. The pressure has been increased with the heating of the container and the change in pressure has been 572 mm Hg.

Assuming the gas has been following the ideal behavior. According to the ideal gas equation,

PV =nRT

If the same gas has been heated, the n and R will be constant, as well as with the constant volume of initial and final pressure, the relationship to the P and T can be given as:

[tex]\rm \dfrac{Initial\;pressure}{Initial\;temperature}\;=\;\dfrac{Final\;pressure}{Final\;temperature}[/tex]

(a) For the gas with an initial pressure of 1.69 atm, the final pressure will be:

[tex]\rm \dfrac{1.69}{300}\;=\;\dfrac{Final\;Pressure}{100}[/tex]

Final pressure = 0.563 atm.

The change in pressure = Initial pressure - Final pressure

The change in pressure = 1.63 - 0.563 atm

The change in pressure = 1.06 atm.

The pressure has been reduced with the cooling of the container, and the change in pressure has been 1.06 atm.

(b) For the gas at initial pressure 715 mm Hg, the final pressure will be:

[tex]\rm \dfrac{715}{500}\;=\;\dfrac{Final\;Pressure}{900}[/tex]

Final pressure = 1,287 mm Hg.

The change in pressure = Final pressure - Initial pressure

The change in pressure = 1,287 - 715 mm Hg

The change in pressure = 572 mm Hg

The pressure has been increased with the heating of the container and the change in pressure has been 572 mm Hg.

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Which statement best describes what the density
of an object represents?
Density is the mass of an object per unit of
length.
Density is the volume of an object of a
certain mass.
Density is the length of an object for a certain
mass.
Density is the amount of matter in a certain
volume.

Answers

Density is the amount of matter in a certain volume.

Answer:

d

Explanation:

edg2020

How many atoms in 8.9 moles of iron

Answers

Answer:

5.3578e+24

Explanation:

1 mole = 6.02 x 10^23

6.02 x 10^23 x 8.9 =

5.3578e+24

How many moles are in 255 mL of a 2.35 M solution of H2SO4?

Answers

Answer:

.59925 moles

Explanation:

What are some lessons from
past epidemics that we can
apply to our current coronavirus pandemic?

Answers

That if we don’t separate our selves hundreds and thousands of people will die but if we stay apart it will resolve sooner

Answer:

The 1918 influenza pandemic and 2002-2003 SARS outbreak suggests social distancing measures, communication, and international cooperation are the most effective methods to slow down the coronavirus.

Explanation:

How is the human hand different from the ape hand

Answers

Answer:

in explanation

Explanation:

Human hands are distinguished from apes by possessing longer thumbs relative to fingers.

Hope this helps!!!

Answer:

The human hand and primate hand both have finger prints and palm prints, or palmar whorls, but the prints differ. Human fingerprints have a higher ride density than primate fingerprints, which means the print ridges, or lines, are closer together. While the human’s prints are denser, primates usually have more lines overall.

Explanation:

I've learned this before

b. How could recycling electronics prevent some of the negative effects of
mining metals? (2 points)

Answers

Answer:

It will reduce the quantity of metals extracted for use in the manufacturing of electronics

Explanation:

The manufacturing of electronics is a huge market for the metal extraction industry. Many electronics have metal casing, metal circuit boards etc. This implies that a large quantity of metal is required for the production of electronics. This leads to consistent mining activities in order to supply enough quantity of metal to produce more electronics.

However, if electronics are recycled, less metals are extracted for the electronics industry. This saves energy required for mining operations and minimizes the deleterious environmental impact associated with metal mining from the earth. These deleterious consequences include; erosion, sinkholes, loss of biodiversity, contamination of soil, groundwater, and surface water by the chemicals emitted from mining processes.

Hence, recycling of electronics saves the environment from the degradation caused by consistent mining activities. Reduction of mining activities by recycling ought to be an important goal of the electronics manufacturing industry.

A moving train comes to a stop at the station. What happened to

make the train change motion?

1)The train experienced an unbalanced force.


2)The train experienced a balanced force.


3)The train would stop with or without forces.


4)The train does not experience forces acting on it.

Answers

the second one “The train experienced a balanced force.

I know the correct answer is either a or d. Can anyone explain which one it is and why? CH3C ≡ CCH2CH2Cl is named: a. 1-chloro-3-pentyne b. 5-chloro-2-pentene c. 1-acetylenyl-3-chloropropane d. 5-chloro-2-pentyne

Answers

Answer:

D.

Explanation:

CH₃C≡ CCH₂CH₂Cl

Since there are 5 carbons so the suffix used is "pent"

There is a triple bond so its alkyne

So the compound becomes 2-pentyne (2 because the triple bond is with the 2nd carbon)

Then,

The functional group of chlorine is attached with 5th carbon So the compound becomes

5-chloro,2-pentyne

4. If 175 undecayed nuclei remain from a sample of 2800 nuclei, how many half-
lives have passed? (Show your work.) *
Your answer

Answers

Answer:

X = 4

Explanation:

Start 2800

End 175

175 = 2800x(0.5)^X

175/2800 = 0.5^X

0.0625 = 0.5^X

log(0.5 x) = log(0.0625)

x · log(0.5) = log(0.0625)

-0.301x = -1.204

x = -1.204/-0.301

x = 4

1. The polymerization of amino acids produces:

organic acids

lipids

proteins

carbohydrates

2. Which group of compounds has a –OH functional group?

aldehydes

esters

carboxyl acids

alcohols

3. Unsaturated compounds _____.

do not readily react

have a high activation energy

require UV light to react

are very reactive

4. Butene would have ____ carbon atoms and a_____ bond.

- 4 - double

- 2 - single

Answers

Answer:

1. Proteins

2. Alcohol

3. Unsaturated compounds are very reactive.

4. Butene has 4 carbon atoms and one double bonds attached to it

Explanation:

1. The polymerization of amino acids gives protein.

Polymerization is a process whereby smaller unit molecules of organic compounds combine repeatedly, in a regular fashion to form a larger organic structure or compound.

The smaller units are called monomers while the larger compound formed are called the polymers.

In this case, the smaller units are the amino acids held or linked together by peptide bonds to form a polymer called proteins.

2.

Compounds with functional group of -OH are called alcohols.

Alcohols are also known as alkanols and they belong to a class of organic compounds where -OH functional group is attached to an alkyl group. They have general formula of CₓH₂ₓ₊₁OH where x refers to the number of carbon atom. They're also categorized into primary, secondary and tertiary alcohols based on the type of carbon in the which the functional group (-OH) is attached to.

3.

Unsaturated compounds are very reactive due to the presence of lone pairs of electrons present in them.

4. Butene actually has 4 carbon atoms and several single bonds attached to it.

Butene has a total of 12 bonds and 1π (pi-bond) while several 11σ (sigma bonds) are attached to it.

10.Conduction is the method of heat transfer in solids but not liquids and gases. Why?
(1 Point)
Finiter your​

Answers

Answer:

Conduction only happens when the object is a solid, because conduction happens in objects that are closely, with molecules that are closely packed together, and have a definite shape. Since, in liquids and gases, the shape is not definite nor do they have closely packed molecules., conduction does not take place in them

The type of energy transferred by a wave in a medium is kinetic energy.

Answers

Answer:

The statement is true.

Explanation:

The different means by which the energy is transferred is commonly termed to be 'wave'.

Wave refers to the disturbance transmission from a specific point to another. Different sources are involved in this transmission. The vibration of particles helps in the flow of energy from one medium to another. Vibration leads to the formation of kinetic energy flowing from one medium to another.

Will a battery with magnesium (Mg) as the anode and aluminum (Al) work to power a flashlight? Why or why not?

Answers

Answer:

Yes because magnesium has a more negative reduction potential than aluminum.

Explanation:

The single factor that will determine whether a battery with magnesium as anode and aluminium as cathode will work or not is the respective electrode potentials of the two elements.

Recall that in a battery, oxidation occur at the anode and reduction occurs that the cathode. The reduction potential shows the ease with which a metal is reduced or oxidized. The substance with the most negative reduction potential will function as the anode while the substance with the less negative electrode potential will function as the anode.

The reduction potential of Magnesium is -2.37 V while that of aluminum is -1.66 V. This implies that magnesium must function as the anode and aluminum as the cathode in order to have a spontaneous electrochemical process in the cell.

Plz help me with this question

Answers

The correct answer C

Calculating [H.]
DETERMINE THE CONCENTRATION OF HOF EACH SOLUTION
» [OH-] = 1 x 10-IM
CH'] =
» pH = 2
[H] =
» [OH ) = 1 x 10-8 M
(H"]=
» POH= 9
[H] -

Answers

Answer:

The answer to your question is given below below:

Explanation:

1. Data obtained from the question:

Concentration of Hydroxide ion, [OH-] = 1x10^-1 M

Concentration of Hydrogen ion, [H+] =..?

The concentration of Hydrogen ion and hydroxide ion are related with the following formula:

[H+] x [OH-] = 1x10^-14

[H+] x 1x10^-1 = 1x10^-14

Divide both side by 1x10^-1

[H+] = 1x10^-14 / 1x10^-1

[H+] = 1x10^-13M

2. Data obtained from the question include:

pH = 2

Hydrogen ion concentration, [H+] =..?

pH = - log [H+]

2 = - log [H+]

-2 = log [H+]

[H+] = antilog (-2)

[H+] = 0.01M

3. Data obtained from the question:

Concentration of Hydroxide ion, [OH-] = 1x10^-8 M

Concentration of Hydrogen ion, [H+] =..?

The concentration of Hydrogen ion and hydroxide ion are related with the following formula:

[H+] x [OH-] = 1x10^-14

[H+] x 1x10^-8 = 1x10^-14

Divide both side by 1x10^-8

[H+] = 1x10^-14 / 1x10^-8

[H+] = 1x10^-6M

4. Data obtained from the question include:

pOH = 9

Hydrogen ion concentration, [H+] =..?

First we shall determine the pH.

The pH and pOH are related with the following formula:

pH + pOH = 14

pH + 9 = 14

Collect like terms

pH = 14 - 9

pH = 5

Now, we can obtain the [H+] as follow:

pH = - log [H+]

pH = 5

5 = - log [H+]

-5 = log [H+]

[H+] = antilog (-5)

[H+] = 1x10^-5M

What happens to mass in an isolated system?

Answers

Answer:

In isolated sysrem mass remains constant.

Explanation:

Answer:

Yes is remains constant

Explanation:

Isolated systems can't make energy or matters come in or out, so the mass stays the same.

Think of it as a marble in a balloon once you tie it and shake the marble in the balloon, there is no extra marbles coming in nor is the marble out of the balloon so that mass(weight is the same.

The table below shows two conclusions about atoms based on experiments by Rutherford and Thompson. Which of these statements best explains why Rutherford and Thompson visualized the atom differently? Atoms of different elements contain different particles. New experimental processes provide new scientific evidence. A single model of an atom cannot be agreed upon by all scientists. Scientists believe in proposing theories which contradict current theories.

Answers

Answer:

Scientists with varied experimental processes and interests perceive things differently.

Explanation:

Scientists believe in proposing theories which contradict current theories. So the correct option is D.

What are the atomic models?

Recently, the structure of atoms has been discovered. Before the ideal model of an atom was found, several others were proposed and abandoned.

Atomic Model of J.J. Thomson

In his hypothesis, Thomson compared the definition of an atom to that of a Christmas pudding.He claimed that atoms are made up of a positively charged sphere with embedded electrons.Additionally, he claimed that because the magnitudes of positive and negative charges are equal, an atom as a whole is electrically neutral.

Atomic Model of Rutherford

Rutherford experimented with α-particle scattering on a gold sheet.He noticed that the majority of the negative ions did not deflect when they travelled through the gold foil.Small angles were experienced by certain α-particles, whereas almost 180° was experienced by others.This experiment led Rutherford to the conclusion that an atom's nucleus, a positively charged spherical centre with a radius of 10-10 metres, contains almost all of the atom's mass (having a radius of 10–15 m).

Therefore the correct option is D.

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1.

A car tire was inflated to 75 kPa at the repair shop where the

temperature is 15 °C. What is the pressure of the tire on the trip home

if the temperature of the road surface is 32 °C? (Write your answer

nearest whole number)

kPa

Answers

Answer:

THE PRESSURE OF THE TIRE ON THE TRIP HOME AT THE ROAD SURFACE TEMPERATURE OF 32°C IS 160 kPa.

Explanation:

Initial Pressure = 75 kPa

Initial temperature = 15 °C

Final temperature = 32 °C

Final pressure = unknown

Using the combined equation of gases;

P1V1/T1 = P2V2/ T2

Since the tire will have the same volume of air in it showing that volume of constant both at the repair shop and on the road surface.

The relationship between pressure and temperature is used with constant volume.

P1/T1 = P2/ T2

75 kPa / 15 °C = P2 / 32 °C

P2 = 75 kPa * 32 °C / 15 °C

P2 = 2400 kPa °C / 15 °C

P2 = 160 kPa.

So therefore, the pressure of the tire on the trip home when the temperature of the road surface is 32°C is 160 kPa.

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