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4 years ago

Explain why certain parts of the Earth are more prone to earthquakes or volcanoes.

1 answer:

7 0

If countries are on plate boundaries, such as Japan, they are more prone to earthquakes. If countries are above hot spots, such as Hawaii, they are more prone to volcanoes.

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Experts believe that a good night sleep is vital to a success in school. Would kids that sleep 8 or

Artyom0805 [142]

Answer:

kids who sleep 8 or more hours a night

Explanation:

I hypothesize that kids who sleep 8 plus hours a night because your brain needs a good night's sleep to regenerate .

6 0

3 years ago

Calculate the concentration of acetic acid, HAc, and acetate ion, Ac−, in a 0.25M acetate buffer solution with pH = 5.36. "0.25M

Neporo4naja [7]

Answer:

[HAc] = 0.05M

[Ac⁻] = 0.20M

Explanation:

The Henderson-Hasselbalch formula for the acetic acid buffer is:

pH = pka + log₁₀ [Ac⁻] / [HAc]

Replacing:

5.36 = 4.76 + log₁₀ [Ac⁻] / [HAc]

3.981 = [Ac⁻] / [HAc] (1)

Also, as total concentration of buffer is 0.25M it is possible to write:

0.25M = [Ac⁻] + [HAc] (2)

Replacing (2) in (1)

3.981 = 0.25M - [HAc] / [HAc]

3.981 [HAc] = 0.25M - [HAc]

4.981 [HAc] = 0.25M

[HAc] = 0.05M

Replacing this value in (2):

0.25M = [Ac⁻] + 0.05M

[Ac⁻] = 0.20M

I hope it helps!

7 0

4 years ago

In a molecule of fluorine, the two shared electrons give each fluorine atom how many electron(s) in the outer energy level

timofeeve [1]

Answer:

8 electrons

Explanation:

As per the octet rule, the atoms possess a tendency to bond in a manner that every atom must have at least eight(8) electrons in its outermost/valence shell. It can be done either by sharing, gaining, or losing electrons from one atom to another. According to this rule, flourine would have 8 electrons in its outer shell after two shared electrons are given to it.

4 0

3 years ago

A sample of cobalt has a mass of 27 g and a density of 9 g/cm^3. What would be its volume?

8_murik_8 [283]

Given ,

Mass of sample of cobalt = 27 g

density of sample of cobalt = 9g/cm^3

We know that ,

Density = mass of sample/volume of sample

From that relation ,

We can deduce the following as

Volume = mass of sample/density of sample

Hence , required volume of sample of cobalt = 27 g /9 g/cm^3 = 3 cm^3

The volume is $\fbox{3cm cube}$

3 0

3 years ago

The process by which a semipermeable membrane allows water molecules, small molecules, and ions to pass through while retaining

Jet001 [13]

The process is know as diffusion in which substances move from higher concentration to lower concentration

5 0

3 years ago