The order of increasing polarity of the solvents is; hexane< diethyl ether < acetone < n-propanol < methanol < water
What is chromatography?Chromatography literarily means "color writing". It provides a means of separating the components of a mixture based on its components.
The solvent in chromatography is the mobile phase while the adsorbent is the stationary phase. The order of increasing polarity of the solvents is; hexane< diethyl ether < acetone < n-propanol < methanol < water
If we have a mixture of n-propanol and water, it would be good to add hexane to the mixture for the sake of the elution of non-polar solutes.
The secondary color green may be composed of more than one color while red, blue and yellow are single colors.
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298K is equivalent to how many degrees Celsius?
Explain the steps
Answer:
24.80°C
Explanation:
hope it helps...!!!
7.06 equilibrium lab report
Chemical equilibrium is a dynamic equilibrium whereby the forward and backward reactions are occurring at the same rate.
What is chemical equilibrium?Chemical equilibrium refers to a situation in which the forward reactions and the backward reactions in a reversible reaction are occurring at the same same same rate.
Factors that affect equilibrium include:
temperature pressure concentrationFor a closed reaction system in equilibrium, the equilibrium position of the reaction will adjust to nullify any changes imposed on the system.
Therefore, chemical equilibrium is a dynamic equilibrium.
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A 260.0 −mL buffer solution initially contains 2.5×10−2 M of HCHO2 and 2.5×10−2 M of NaCHO2
What mass of the correct reagent should you add (in grams)?
Express your answer using two significant figures.
The mass of HCHO2 and NaCHO2 to be added to the buffer solution are 0.23g and 0.44g respectively
Data;
Volume of solution = 260mLconc. of HCHO2 = 2.5*10^-2Mconc. of NaCHO2 = 2.5*10^-2MMass of Reagent AddedTo calculate the mass of reagent added, let's start with HCHO2
The mass of HCHO2 to be added is the number of moles of HCHO2 multiplied by it's molar mass.
[tex]260*10^-^3 * 2.5*10^-^2 * 46 = 0.229 = 0.23g[/tex]
The mass of NaCHO2 to be added in the buffer solution is
[tex]260*10^-^3*2.5*10^-^2*68 = 0.442 = 0.44g[/tex]
The mass of HCHO2 and NaCHO2 to be added to the buffer solution are 0.23g and 0.44g respectively
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how have your thoughts changed about Evolution overtime
Answer:
monkey see, monkey do
Explanation:
boom :)
Answer:
I think it's a game with me and I will knock out a bit and I hope you are u all the way you can get a little bit of a good time to come over here in a bit of the world
In the reaction
Al2S3(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2S(g),
how many moles of HCl are used for each mole of AlCl3 formed?
Predict the organic product or products for the reaction shown.
The organic product for the reaction given in the image is:
"Quaternary ammonium hydroxide". This process is referred to as Hofmann's elimination.
What is Hofmann's elimination?
The chemical process of creating tertiary amines and alkenes using the treatment of quaternary ammonium with excess methyl iodide, that is, (CH₃)₂ NH, as well as...
the treatment of the resulting compound with a mixture of heat, silver oxide (that is Ag₂O (aq)), and water is what is referred to as Hoffmann's Elimination process.
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The dark areas on the map show the distribution of coral reefs around the world. What explanation best
describes why the distribution of coral reefs is limited to the areas shown on the map? ( marine science)
- Competition for space is lowest in waters along the equator.
- Equatorial waters provide some of the clearest water for symbiotic algae to pro
pce energy,
- Predation is lowest in areas along the equator because of increased rates of decomposition.
- The corals need the strong water currents found here in order to find sufficient mates.
Answer:
I think is D not sure
Explanation:
In an ecosystem, the corals need the strong water currents found here in order to find sufficient mates.
What is an ecosystem?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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How can you use a barium chloride solution to help identify a sulfate solution?
answer explanation:
Sulfate ions in solution, SO 4 2 -, are detected using barium chloride solution. The test solution is acidified using a few drops of dilute hydrochloric acid, and then a few drops of barium chloride solution are added. A white precipitate of barium sulfate forms if sulfate ions are present.Answer:
Testing for sulfate ions
Sulfate ions in solution, SO 4 2 -, are detected using barium chloride solution. The test solution is acidified using a few drops of dilute hydrochloric acid, and then a few drops of barium chloride solution are added. A white precipitate of barium sulfate forms if sulfate ions are present.
Explanation:
How does increasing the temperature change the physical properties of an object?
1. Increasing the temperature causes chemical reactions to occur
2. Increasing the temperature changes the kinetic energy of the particles of a material
3. Increasing the temperature causes changes in electric fields
4. Increasing the temperature causes the material to become a new compound
Increasing the temperature change the physical properties of an object through the following:
Increasing the temperature causes chemical reactions to occur.Increasing the temperature changes the kinetic energy of the particles of a material.Increasing the temperature causes changes in electric fields.What is Temperature?This can be defined as the degree of hotness or coldness of a substance and it influences some physical properties.
The properties affected are listed above which makes options 1,2 and 3 the most appropriate choice.
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Use the chart below to answer the question.
Answer correctly.
Which species are more closely related?
A) M. furo and F. catus
B) Balenopora and Mustela
C) M. furo and B physalus
D) B. physalus and F. catus
Answer:
Species M. furo and F. catus
Explanation:
When you look at their family name, both species have -lidae at the end, indicating that they are more closely related.
1s22s22p63s23p3
what element does this represent
Answer:
Its phosphorus (P)
Explanation:
In writing the electron configuration for Phosphorus the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the next 2 electrons for Phosphorous go in the 2s orbital. The next six electrons will go in the 2p orbital. The p orbital can hold up to six electrons. We'll put six in the 2p orbital and then put the next two electrons in the 3s. Since the 3s if now full we'll move to the 3p where we'll place the remaining three electrons. Therefore the Phosphorus electron configuration will be 1s22s22p63s23p3.
What is the difference between metallic and non metallic oxides?
Answer:
Metal oxides are compounds composed of metal ions and oxide ions. Nonmetal oxides are compounds composed of nonmetal atoms and oxygen atoms. The main difference between metal oxides and non metal oxides is that metal oxides are basic compounds whereas nonmetal oxides are acidic compounds.
Explanation:
have a great day ahead
tC
Answer:
Metals react with oxygen to form metallic oxide while Nonmetals react with oxygen to form non-metallic oxide. metallic oxides are basic in nature while Nonmetallic oxides are acidic in nature.
Metal oxides are compounds composed of metal ions and oxide ions. Nonmetal oxides are compounds composed of nonmetal atoms and oxygen atoms. The main difference between metal oxides and non-metal oxides is that metal oxides are basic compounds whereas nonmetal oxides are acidic compounds.
METALS:
Metals usually do not combine with hydrogen. Only a few reactive metals combine with hydrogen to form ionic metal hydrides.
--------------------------------------------------------------------
NON-METALS:
Non-metals react with hydrogen to form stable, covalent hydrides.
Explanation:
Have a great rest of your day
#TheWizzer
For the reaction shown, find the limiting reactant for each of the initial quantities of reactants 4Cr + 3o2 -> 2Cr2O3 d)14.8 mol Cr; 10.3 mol O2
Answer: O2
Explanation:
The balanced chemical equation is:
4 Cr + 3 O2 ---> 2 Cr2O3
4 mol of Cr reacts with 3 mol of O2 to form 2 mol of Cr2O3
For 14.8 mol of Cr, 11.1 mol of O2 is required
But we have 10.3 mol of O2
So, O2 is the limiting reagent
Granite is part of the crust layer of the earth.
True
False
Answer:
That would be True
Explanation:
granite is a part of the crust layer.
From the reaction: B2H6 + O2 HBO2 + H2O a. What mass of O2 will be needed to burn 36.1 g of B2H6? b. How many moles of water are produced from 19.2 g of B2H6?
A. The mass of O₂ needed to burn 36.1 g of B₂H₆ is 123.77 g
B. The number of mole of water, H₂O produced from 19.2 g of B₂H₆ is 1.372 mole
Balanced equationB₂H₆ + 3O₂ —> 2HBO₂ + 2H₂O
Molar mass of B₂H₆ = (2×11) + (1×6) = 28 g/mol
Mass of B₂H₆ from the balanced equation = 1 × 28 = 28 g
Molar mass of O₂ = 2 × 16 = 32 g/mol
Mass of O₂ from the balanced equation = 3 × 32 = 96 g
SUMMARY
From the balanced equation above,
28 g of B₂H₆ required 96 g of O₂
A. How to determine the mass of O₂ neededFrom the balanced equation above,
28 g of B₂H₆ required 96 g of O₂
Therefore
36.1 g of B₂H₆ will require = (36.1 × 96) / 28 = 123.77 g of O₂
Thus, 123.77 g of O₂ is required for the reaction
B. How to determine the mole of water producedWe'll begin by calculating the number of mole of in 19.2 g of B₂H₆. This can be obtained as follow:
Mass of B₂H₆ = 19.2 g Molar mass of B₂H₆ = 28 g/mol Mole of B₂H₆ =?Mole = mass / molar mass
Mole of B₂H₆ = 19.2 / 28
Mole of B₂H₆ = 0.686 mole
Finally, we shall determine the number of mole of water produced. This is illustrated below:
Balanced equationB₂H₆ + 3O₂ —> 2HBO₂ + 2H₂O
From the balanced equation above
1 mole of B₂H₆ reacted to produce 2 moles of H₂O
Therefore, H₂O
0.686 mole of B₂H₆ will react to produce = 0.686 × 2 = 1.372 mole of H₂O
Thus, 1.372 mole of H₂O was obtained from the reaction
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How many people were considered undernourished in Latin America and the Caribbean in 2018?
Question 4 options:
513.9 million
2.6 million
821.6 million
42.5 million
Which of the following is a nonmetal?
A.
potassium (K)
B.
aluminum (Al)
C.
calcium (Ca)
D.
chlorine (Cl)
How do i solve this?
Draw the product of this reaction. Ignore inorganic byproducts.
The compound is formed by addition reaction. The product is showed in the image attached.
Addition reactionThe term addition reaction refers to a type of reaction in which a compound is added across the multiple bond. In this case, the iodine molecule is added to the olefinic bond as shown.
The structure of the product formed has been attached to this answer. The product is formed by addition across the double bond.
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An alternating current can be described as one in which:
A. Electrons flow in both directions in the circuit.
B. Electrons flow in only one direction in the circuit
C. Electrons move only from the negative terminal of the battery.
D. Electrons move only from the positive terminal of the battery.
A
Explanation:
electrons flow in both directions
Answer: A I know it but I forgot how to explain it.
The Arctic’s tundra, though very cold for much of the year, is said to be more strongly defined by its cool summer temperatures, instead of its winter lows. Why?
Because these low summer temperatures can cause a rain-shadow effect
Because these low summer temperatures limit the growth of plants in the summer
Because these low summer temperatures can rapidly changing weather
Because these low summer temperatures chase large land masses of ice that do not even totally melt in the summer.
Answer: Because these low summer temperatures limit the growth of plants in the summer
Explanation: Took the test!
In an ecosystem, like Arctic's tundra, though very cold for much of year, is said to be more strongly defined by its cool summer temperatures, instead of its winter lows because these low summer temperatures limit growth of plants in summer.
What is an ecosystem?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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I am so confused that i don't even understand how to answer it
Answer:
What's the question so I can help?
I will just edit my answer when you have asked your question and post it here.
Explanation:
Calculating Moles of Particles
QUICK CHECK
How many moles of particles are formed by dissolving one mole of each of the following in water?
Ethanol
CaCl2
5 X = 1 mole(s) of particles
25 X = 3 mole(s) of particles
COMPLETE
COMPLETE
(NH4)2SO4
Sucrose
mole(s) of particles
3 X = 1 mole(s) of particles
DONE
COMPLETE
Na2HPO4
mole(s) of particles
3
Answer:
check the picture down below
Explanation:
How many kilojoules are required to melt 15 g of ice at 0 degrees C, and raise the temperature of the liquid that forms to 85 degrees C?
Answer:
10026 joules
Explanation:
its right.
Write the balanced NET ionic equation for the reaction when ZnI₂ and Pb(ClO₄)₂ are mixed in an aqueous solution.
Answer:
The total ionic equation is:
3 Na+ + PO4-3 + 3H+ + 3Cl- --> H3PO4 + 3Na+ + 3 Cl-
And the net ionic equation is:
3H+ + PO4-3 --> H3PO4
If the pH is 6.1,what is the concentration of H^+?
Hi!
[tex]\\ \sf\rightarrow pH=-log[H^+][/tex]
[tex]\\ \sf\rightarrow -log[H^+]=6.1[/tex]
[tex]\\ \sf\rightarrow log[H^+]=-6.1[/tex]
[tex]\\ \sf\rightarrow [H^+]=10^{-6.1}[/tex]
[tex]\\ \sf\rightarrow [H^+]=7.94M[/tex]
based on the electron configuration of the two atoms predict the ratio of metal cationic (+) atom to nonmetal anionic (-) atom in the compound. hydrogen and fluorine
The metal cationic (+) atom to nonmetal anionic (-) atom ratio in the compound formed between hydrogen and fluorine is 1:1.
What is a compound?A compound is madeup of two or more atoms that are chemically combined together. In this case, we have the atoms; hydrogen and fluorine.
The electronic configuration of the atoms are not shown here but the metal cationic (+) atom to nonmetal anionic (-) atom ratio in the compound formed between hydrogen and fluorine is 1:1.
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Ignoring the contributions of wind, a baseball would be expected to travel farther in warm, humid air because: Select one: a. water vapor helps to lift the baseball even higher. b. water vapor sticks to baseballs. c. water vapor is less dense than dry air. d. none of these
Answer:
water vapor is less dense than dry air
Suppose you are provided with a 35.83 g sample of potassium chlorate to perform this experiment. What is the mass of potassium chloride you expect to release upon heating?
For a 35.83 g sample of potassium chlorate, the mass of potassium chloride is mathematically given as
M Kcl=21.62g
What is the mass of potassium chloride you expect to release upon heating?Generally, the equation for the Chemical Reaction is mathematically given as
2KClO_3----->2KCl+2O_2
Therefore
[tex]Mole of KCl=\frac{35.57}{122.55}[/tex]
Mole of KCl=0.29mol
Mass of Kcl=0.29*74.55
Mass of Kcl=21.62g
In conclusion, Mass of Kcl
M Kcl=21.62g
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Acid rain can be caused by all of the following except..
Select one:
A. automobile exhaust.
B. coal-burning power plants.
C. earthquakes.
D. volcanic eruptions.
(I’ve come to the conclusion that they all can cause acid rain, so I am at a loss as to which one doesn’t.)
Answer:
Earthquakes
I might be wrong. Hope this helps
Answer:
earthquake
Explanation:
they all can cause house break and people die dangerous
In cells, __________ are proteins that are needed to lower the amount of energy required to start chemical reactions
Answer: I think it’s enzymes
Explanation: