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3 years ago

When something burns, __________________ material is formed. a.old b.no c.new

Chemistry

1 answer:

AVprozaik [17]3 years ago

6 0

Answer:

New material

Explanation:

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The fatty acids in the tail of a phospholipid molecule are _____. nonpolar and hydrophobic

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Nonpolar and hydrophobic

Phospholipid molecules have a polar and hydrophillic head, which consists of glycerol and phosphate ions. In a plasma membrane, this head points towards the hydrophillic environment outside of the cell. The tails, on the other hand, are hydrophobic and nonpolar, which means they do not allow water to pass through them.

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3 years ago

A certain volume of a 0.80 m solution contains 4.3 g of a salt. what mass of the salt is present in the same volume of a 2.2 m s

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In a 2.2 m solution with the same volume there would be 11.825 g of a salt

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4 years ago

What is an ecosystem? living environment by the way

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An ecosystem is a lot of things and places that need each other to survive

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4 years ago

Give the major product formed when phenol is heated with concentrated H2SO4 and SO3. (There is more than one correct answer, but

iris [78.8K]

Answer:

See image attached and explanation

Explanation:

The reaction of phenol with SO3/H2SO4 is an electrophilic reaction. The electrophile attacks portions of high electron density in the substrate phenol.

The -OH group activates phenol towards electrophilic substitution at the ortho and para positions, hence the product(s) formed in this reaction(only one product is shown here as required by the question).

The sulphonation of phenol using concentrated sulfuric acid at lower temperature yields majorly the ortho product whereas at higher temperature the para product predominates.

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3 years ago

How many moles are contained in 70. milliliters of a 0.167 M solution of p-toluidine hydrochloride? Enter only the number to two

kramer

Answer: The amount of p-toluidine hydrochloride contained is 2.4 moles.

Explanation:

To calculate the number of moles for given molarity, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}\times 1000}{\text{Volume of solution (in mL)}}$

Molarity of p-toluidine hydrochloride solution = 0.167 M

Volume of solution = 70. mL

Putting values in equation 1, we get:

$0.167=\frac{\text{Moles of p-toluidine hydrochloride}\times 1000}{70}\\\\\text{Moles of p-toluidine hydrochloride}=\frac{(0.167\times 70}{1000}=2.38mol=2.4mol$

Hence, the amount of p-toluidine hydrochloride contained is 2.4 moles.

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4 years ago