For the water molecule, oxygen is ___ electronegative than hydrogen. The difference in electronegativity signifies that the hydrogen-oxygen bond is _. According to the electronegativity difference between the atoms in water, it would be appropriate to label hydrogen with the symbol, _, and oxygen with the symbol, _. Based on the electronegativity difference between carbon and oxygen, the bonds in carbon dioxide are _.
According to the electronegativity difference between the atoms in carbon dioxide, it would be appropriate to label oxygen with the symbol, _, and carbon with the symbol, _.
Based on the electronegativity difference between carbon and hydrogen, the bonds in methane are _.
According to the electronegativity difference between the atoms in methane, it would be appropriate to label hydrogen with the symbol, _, and carbon with the symbol, ___.

Answers

Answer 1

Answer:

In water molecule, oxygen is more electronegative than hydrogen.

The difference in electronegativity signifies that the hydrogen-oxygen bond is polar in nature i.e. partial positive and partial negative.

According to the electronegativity difference between the atoms in water, it would be appropriate to label hydrogen with the symbol partial positive(Hδ+) and oxygen with the symbol partial negative(Oδ-.) due to attraction of electron pair.

Based on the electronegativity difference between carbon and oxygen, the bonds in carbon dioxide are polar in nature means they making poles.

According to the electronegativity difference between the atoms in carbon dioxide, it would be appropriate to label oxygen with the symbol partial negative(Oδ-) and carbon with the symbol partial positive(Cδ+).

Based on the electronegativity difference between carbon and hydrogen, the bonds in methane are polar because of different values of electronegativity.

According to the electronegativity difference between the atoms in methane, it would be appropriate to label hydrogen with the symbol partial positive(Hδ+) and carbon with the symbol partial negative(Cδ-.).

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Answer 2

Answer:

polar

plus delta

negative delta

polar

negative delta

positive delta

polar

positive delta

negative delta

negative delta are the more electronegative molecules

positive delta are the least electronegative molecules

polar because they have differing electronegativities

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The atomic mass of an element can be approximated by adding the number of _______ plus the average number of _______.A. protons; electrons

B. protons; neutrons

C. neutrons; electrons

Answers

Answer: Option (B) is the correct answer.

Explanation:

Atomic mass is defined as the summation of total number of protons and neutrons present in an element.

On the other hand, atomic number means the total number of protons present in an element.

For example, atomic number of sodium is 11 and number of neutrons present in it are 12.

Hence, atomic mass of sodium = no. of protons + no. of neutrons

= (11 + 12) amu

= 23 amu

Therefore, we can conclude that the atomic mass of an element can be approximated by adding the number of protons plus the average number of neutrons.

by adding number of protons and neutrons

to neutralize a 40.0 ml sample of 0.650 m hcl using titration, what volume (ml) of the 0.800 m naoh would you need at the equivalence point of the titratio

Answers

The volume of the NaOH that we would now need for the neutralization reaction is32.5 mL.

What is neutralization?

Neutralization is a chemical reaction in which an acid reacts with a base to form a salt and water. In this reaction, the hydrogen ions from the acid combine with the hydroxide ions from the base to form water

Number of moles of HCl = 40/1000 L * 0.65

= 0.026 moles

Since the reaction is 1:1, there would be 0.026 moles

of the NaOH used as such we would now have that;

Volume of the NaOH = 0.026 moles/0.8 M

= 32.5 mL

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Two basic properties of the solid phase are

Answers

Molecules are packed tightly together. It keeps it shape.

Which solution has the same boiling point as 0.25 mol CaCl2 dissolved in 1000 g water?Help Please, Thanks!

0.75 mol sucrose dissolved in 1000 g water
1.0 mol ethylene glycol dissolved in 1000 g water
0.50 mol CaCl2 dissolved in 1000 g water
0.25 mol NaCl dissolved in 1000 g water

Answers

The boiling point of water at 1 atm is 100 degrees celsius. However, when water is added with another substance the boiling point of it rises than when it is still a pure solvent. This called boiling point elevation, a colligative property. The equation for the boiling point elevation is expressed as the product of the ebullioscopic constant (0.52 degrees celsius / m) for water), the vant hoff factor and the concentration of solute (in terms of molality).

ΔT(CaCl2) = i x K x m = 3 x 0.52 x 0.25 = 0.39 °C
ΔT(Sucrose) = 1 x 0.52 x 0.75 = 0.39 °C
ΔT(Ethylene glycol) = 1 x 0.52 x 1 = 0.52 °C
ΔT(CaCl2) = 3 x 0.52 x 0.50 = 0.78 °C
ΔT(NaCl) = 2 x 0.52 x 0.25 = 0.26 °C

Thus, from the calculated values, we see that 0.75 mol sucrose dissolved on 1 kg water has the same boiling point with 0.25 mol CaCl2 dissolved in 1 kg water.

1. Why do all atoms of an element have the same atomic number, although they may have different mass numbers?2. What do we call atoms of the same element with different mass numbers?

3. Explain the meaning of each term in the symbol
(AZ)X

Answers

Atoms of an element have the same atomic number but different mass numbers because the atomic number only contains the amount of protons in an element.
Atoms of the same element that have different mass numbers are called isotopes.
With (AZ)X, the A is the number of protons, the Z is the number of neutrons, and the X is the electrons.

Name the two common secondary structures that polypeptide sheets fold into.

Answers

I think it’s the alpha-helix and the beta-pleated sheet

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