CHEMISTRY COLLEGE

What are two causes of soil loss?​

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Answer 1
Answer:

Answer: The agents of soil erosion are the same as of other types of erosion for example water, ice, wind, and gravity. Soil erosion is more likely where the ground has been disturbed by agriculture, grazing animals, logging, mining, construction, and recreational activities.Basically what I mean is some causes of solid loss is mining, construction

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Use the weather map to answer the question.Weather map with blue line with triangles pointing down and to the right. Red line with semi-circles pointing up and to the right. Red line is to the right of the blue line.© Dorling Kindersley / Universal Images Group / Image Quest 2016What does the red line indicate?A. A cold front is moving to the north and east.B. A cold front is moving to the south and west.C. A warm front is moving to the north and east.D. A warm front is moving to the south and west.
Blood samples for research or medical tests sometimes have heparin added. Why is this done? ​
Testbank, Question 098 In the reaction between an alkyne and Na metal in liquid ammonia, the role of Na is as a(n) ___________.a. catalyst b. electrophile c. Brønsted base d. reducing agent e. Bronsted acid
Choose the option below that is a characteristic of ketones. a. They contain a carbonyl group that exhibits sp hybridization around the carbon atom. b. They contain a carbonyl group with a nonpolar carbon-oxygen bond. c. The functional group of this type of compound must always be on the end of a carbon chain. d. The functional group of this type of compound must always be in the middle of a carbon chain.
how does the volume of an ideal gas at constant temperature and pressure change as the number of moleculess increeases

What does dry ashing mean​

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Dry ashing refers to the use of a muffle furnace capable of maintaining temperatures of 500–600°C. Water and volatiles are vaporized, and organic substances are burned in the presence of oxygen in air to CO 2 and oxides of N 2. Most minerals are converted to oxides, sulfates, phosphates, chlorides, and silicates. Hope this helped!

For the Bradford assay, the instructor will make a Bradford reagent dye by mixing 50 ml of 95% v/v ethanol with 100 mg of Coomassie Blue followed by the addition of 50 ml of 85% v/v phosphoric acid. This entire mixture is then diluted to 1 liter with water. What is the final concentration of phosphoric acid?

Answers

Answer:

4,25% v/v H3PO4

Explanation:

The concentration of phosphoric acid (H3PO4) is expressed as a volume / volume percentage, which means:

%v/v H3PO4 = (mL of pure H3PO4/mL of solution)*100%

In other words, we are only interested in the final volume of the solution to which the phosphoric acid was diluted, regardless of its composition. Which in this case is 1 L (1000 mL).

We can then apply the following equation, commonly used to calculate the initial or final concentration (or volume) of a substance when it is diluted:

Ci*Vi=Cf*Vf

Where:

Ci, is the initial concentration of the substance.

Vi, the initial volume of the substance

Cf, the final concentration reached after dilution

Vf, the final volume of the solution at which the substance was diluted

In this case, the incognite would be the final concentration of H3PO4 reached after dilution, that is, Cf. Therefore, we proceed to clear Cf from the previous equation and replace our data:

Cf = (Ci*Vi)/Vf = (85% v/v * 50 mL)/1000 mL = 4,25 % v/v

Note that being up and down in the division, the mL unit is canceled to result in% v / v.

Molecular compounds result from covalent bonding which are called _______.This is for high school physical science

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Answer:

Diatomic Molecule

Explanation:

The vapor pressure of carbon disulfide is 355.6 torr at 25°C. What is the vapor pressure of a solution prepared by dissolving 10.60 g naphthalene (C10H8, Molar Mass = 128.2 g/mol) in 155 mL CS2 liquid (Molar Mass = 76.14 g/mol, density = 1.261 g/mL)? Assume the solution obeys Raoult's law, and treat naphthalene as a nonvolatile solute.

Answers

The vapor pressure of the solution would be as follows:

344.5764 torr

Given that,

Vapor pressure of Carbon Disulfide = 355.6 torr

volume = 155mL ;

density = 1.261 g/mL

Naphthalene's mass = 10.60 g

Naphthalene's molar mass= 128.2g/mol

Now,

We know that

Number of moles= mass/molar mass

Mass= density × volume

Number of moles =(density × volume) / molar mass

So,

Number of moles of Carbon Disulfide = (1.261 × 155) / 76.14

= (195.455 / 76.14)

= 2.567 moles of Carbon Disulfide

Number of moles of Naphthalene:

Number of moles= 10.60 / 128.2

= 0.083

Now,

Total number of moles :

2.567 + 0.083

= 2.65 moles

Mole fraction of each compound in solution :

Carbon Disulfide:

2.567 / 2.65

= 0.969

Naphthalene

0.083 / 2.65

= 0.031

According to Raoult's:

Psolution = Xsolvent × Posolvent

Carbon Sulfide = Solvent

Xsolvent =Mole fraction of solvent

Posolvent =Vapour  pressure of the pure solvent

Psolution= 0.969 × 355.6 torr

= 344.5764 torr

Thus, "344.5764 torr" is the correct answer.

Learn more about "Pressure" here:

brainly.com/question/23358029

Answer:

344.5764 torr

Explanation:

Molar mass of naphthalene = 128.2g/mol

Mass of naphthalene = 10.60 g

Carbon disulfide:

Molar mass= 76.14g/mol ;

volume = 155mL ;

density = 1.261 g/mL

Vapour pressure = 355.6 torr

Number of moles = mass / molar mass

CS2:

Mass = density × volume

Number of moles = (density × volume) / molar mass

Number of moles = (1.261 * 155) / 76.14 = (195.455 / 76.14) = 2.567 moles of CS2

Number of moles of C8H10:

Number of moles = 10.60 / 128.2 = 0.083 C8H10

Total number of moles :

2.567 + 0.083 = 2.65 moles

Mole fraction of each compound in solution :

CS2 :

2.567 / 2.65 = 0.969

C8H10:

0.083 / 2.65 = 0.031

According to Raoult's:

Psolution = Xsolvent × Posolvent

CS2 = solvent

Xsolvent = Mole fraction of solvent

Posolvent = Vapour pressure of pure solvent

Psolution = 0.969 × 355.6 torr = 344.5764 torr

How many electrons does a Bromine (Br) atom have?(Given Information)
Atomic Number : 35
Neutrons: 45
Charge; -1

Answers

35 yooooooooo...........

If the patient has to be administered a dosage of 2 tablets every 8 hours for 7 days,what is the number of tablets required for the prescribed dosage

Answers

42 tablets. 2*8*7=42
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Which of the following electron configurations represents an excited state of the indicated atom? Group of answer choices a.Na: 1s2 2s2 2p6 3s2 3p2 3s1 b.Ne: 1s2 2s2 2p6 c.N: 1s2 2s2 2p3 d.P: 1s2 2s2 2p6 3s2 3p2 4s1 e.He: 1s2