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Tanya [424]
2 years ago
11

Denise heard that little children will pick food based on color. So she offered 100 kindergarteners colored mashed potatoes for

lunch - red, yellow, green and blue. She recorded how many students selected each color.
What is the dependent variable?

A
Regular, white mashed potatoes.

B
The number of students choosing each color.

C
The color of the mashed potatoes.

D
The age of the students.
Chemistry
1 answer:
Dvinal [7]2 years ago
7 0

Answer:

I think the answer is B. the number of students choosing each color.

Explanation:

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What is the predominant intermolecular force in the liquid state of each of these compounds: ammonia (nh3), carbon tetrachloride
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  • NH₃: Hydrogen bonds;
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<h3>Explanation</h3>

Relative strength of intermolecular forces in small molecules:

Hydrogen bonds > Dipole-dipole interactions > London DIspersion Forces.

It takes two conditions for molecules in a substance to form <em>hydrogen bonds</em>.

  • They shall contain at least one of the three bonds: H-F, O-H, or N-H.
  • They shall contain at least one lone pair of electrons.

NH₃ contains N-H bonds. The central nitrogen atom in an NH₃ molecule has one lone pair of electrons. NH₃ meets both conditions; it is capable of forming hydrogen bonds.

CCl₄ molecules are nonpolar. The molecule has a tetrahedral geometry. Dipole from the polar C-Cl bonds cancel out due to symmetry. The molecule is nonpolar overall. As a result, only London Dispersion Force is possible between CCl₄ molecules.

HCl molecules are polar. The H-Cl bond is fairly polar. The HCl molecule is asymmetric, such that the dipole won't cancel out. The molecule is overall polar. Both dipole-dipole interactions and London Dispersion Force are possible between HCl molecules. However, dipole-dipole interactions are most predominant among the two.

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3 years ago
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C.)Recycled bottles and containers are used to produce lumber products that can be used as an outdoor building material.

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In an aqueous solution which substance yields hydrogen ions as the only positive ion *
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The question is incomplete. Complete question is
<span>In an aqueus solution, which substance yields hydrogen ions as the only positive ions in the solution? 1)NaH 2)HCOOH 3)LiOH 4) CH3CH2OH?
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Answer: Correct answer is option 2, HCOOH

Reason: 
HCOOH is a formic acid. When mixed in water, it undergoes dissociation which can be represented as

HCOOH         </span>↔           HCOO-       +            H+

The compound NaH, will generate hydride ion (H-), while LiOH is an ionic compound, hence when dissolved in water it generated OH- ions. The compound CH3CH2OH is named as ethyl alcohol. This compound donot dissociate in aqueous medium. 
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