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3 years ago

Hydrogen bonds form between neighboring water molecules because of:

1 answer:

4 0

*A & B*

Answers A & B are not possible, as Hydrogen “bonds” are intermolecular forces and do not actually involve transfer or sharing of electrons.

*C & D*

Viscosity and surface tension are not the answer as they are not specific enough to the question.

*E*

Polarity of water molecules is the correct answer, as water molecules are highly polar. The partial positive of the Hydrogen on one water molecule is highly attracted to the partial negative of the Oxygen (due to its lone pairs) on another water molecule.

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The pKa for a weak acid to be used in the buffer should be as close as possible to the desired pH. What if the pKa is not close

nikdorinn [45]

Answer:

When pH = pKa, the ionizable compound in question (either acid or base) will be half protonated and half deprotonated

Explanation:

A convenient way of expressing the relative strength of an acid is by the value of its pKa, which makes it easy to see in small changes in pKa the changes associated with large variations in Ka. Small pKa values are equivalent to large Ka (dissociation constant) values, and as pKa decreases, the strength of the acid increases.

An acid will be stronger the lower its pKa and in a base it happens the other way around, which is stronger the higher its pKa.

Those dissociation constants are not fixed, they depend on other variables. For example, the dissociation constant changes at different temperatures. However, it maintains its value at the same temperature, before changes in the concentration of any of the species or even under the action of a catalyst.

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3 years ago

Which of the following chemical equations depicts a balanced chemical reaction?

Deffense [45]

Answer:

D.) 2 H₂ + O₂ -----> 2 H₂O

Explanation:

An equation is balanced when there is an equal amount of each element on both sides of the reaction. If these amounts are unequal, coefficients can be added to modify the amount of particular molecules.

A.) Not balanced

2 H₂ + 2 O₂ -----> H₂O

Reactants: 4 hydrogen, 4 oxygen

Products: 2 hydrogen, 1 oxygen

B.) Not balanced

2 H₂ + 2 O₂ -----> 2 H₂O

Reactants: 4 hydrogen, 4 oxygen

Products: 4 hydrogen, 2 oxygen

C.) Not balanced

H₂ + O₂ -----> H₂O

Reactants: 2 hydrogen, 2 oxygen

Products: 2 hydrogen, 1 oxygen

D.) Balanced

2 H₂ + O₂ -----> 2 H₂O

Reactants: 4 hydrogen, 2 oxygen

Products: 4 hydrogen, 2 oxygen

3 0

2 years ago

(2.) How many liters are occupied by 3.50 mol carbon dioxide at STP?

lesantik [10]

Answer:

84 dm³

Explanation:

1 mole of any gas occupies 24 litres or 24 dm³ of volume at RTP or STP, so the volume occupied by 3.50 moles of carbon dioxide is: 3.5 x 24 = 84 litres or 84 dm³

3 0

3 years ago

54578 meters per second into miles per hour

xxMikexx [17]

Answer:

54578 mps - 122087.51 mph

Explanation:

3 0

3 years ago

The Chandra X ray Observatory

AlladinOne [14]

The statement that describes NASA's Chandra X-ray Observatory is a space telescope.

Explanation:

Usually telescopes are used by the astronomer's to find objects which are placed in far places.

But Chandra X-ray observatory is the NASA's space telescope.

This telescope is used to find and discover advanced X-rays which are produced in the space due to explosion of stars, clusters and the matter around black hole in the hot regions.

Therefore, this NASA's Chandra X-ray Observatory is a space telescope.

6 0

3 years ago

Read 2 more answers