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Anastasy [175]
2 years ago
13

Imprints of the shells of ocean clams are often found in the rocks of the Appalachian Mountains. What do these imprint fossils M

OST likely indicate?
O A. These mountains were once under the ocean.
OB. These mountains once had a more rainy climate.
OC. Mountain river clams evolved from ocean clams,
OD. Ocean clams evolved from mountain river clams.
Chemistry
1 answer:
Anit [1.1K]2 years ago
7 0
A. It is the most reasonable answer
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Rowena and helga are both performing an experiment with nickel metal. Rowena has a 5 gram sample and determines the density to b
AVprozaik [17]

Answer:

The density of helgas sample is 17.8 g/cm³.

Explanation:

Given that,

Mass of sample of Rowena = 5 gram

Density = 8.9 g/cm³

Mass of sample of helga = 10 gram

We need to calculate the volume of sample

Using formula of volume

V=\dfrac{m}{\rho}

Where, m = mass

\rho = density

Put the value into the formula

V=\dfrac{5}{8.9}

V=0.56\ cm^3

We need to calculate the density of helgas sample

Using formula of density

\rho=\dfrac{m}{V}

Where, m = mass

V = volume

Put the value into the formula

\rho=\dfrac{10}{0.56}

\rho=17.8\ g/cm^3

Hence, The density of helgas sample is 17.8 g/cm³.

8 0
3 years ago
____ occurs when the vapor pressure of a liquid is equal to the external atmospheric pressure.
vaieri [72.5K]

Answer:

huh be more clear

Explanation:

8 0
3 years ago
What is metaphase <br> HELEPWOAUSJSKQJDHEHR
IrinaVladis [17]

Answer:

the second stage of cell division. its between prophase and anaphase during the chromosomes become attached to spindle fibers.

5 0
3 years ago
Liquid nitrogen is cold and can be used to cool objects to -196°C. If you put the bottle of warm air in liquid nitrogen at this
vampirchik [111]

Answer:

Explanation:

It depends on how this is done. If you raise the pressure, the nitrogen will disappear (liquify) and all that will be left will be the 21 % oxygen and the 1% argon.

The process is very complicated because the boiling point of nitrogen keeps on changing. The boiling point is unstable.

6 0
3 years ago
The solubility of oxygen in lakes high in the Rocky Mountains is affected by the altitude. If the solubility of O2 from the air
IceJOKER [234]

Answer:

1.75\cdot 10^{-4} M

Explanation:

Henry's law states that the solubility of a gas is directly proportional to its partial pressure. The equation may be written as:

S = k_H p^o

Where k_H is Henry's law constant.

Our strategy will be to identify the Henry's law constant for oxygen given the initial conditions and then use it to find the solubility at different conditions.

Given initially:

S_1 = 2.67\cdot 10^{-4} M

Also, at sea level, we have an atmospheric pressure of:

p = 1.00 atm

Given mole fraction:

\chi_{O_2} = 0.209

According to Dalton's law of partial pressures, the partial pressure of oxygen is equal to the product of its mole fraction and the total pressure:

p^o = \chi_{O_2} p

Then the equation becomes:

S_1 = k_H \chi_{O_2} p

Solve for k_H:

k_H = \frac{S_1}{\chi_{O_2} p} = \frac{2.67\cdot 10^{-4} M}{0.209\cdot 1.00 atm} = 0.001278 M/atm

Now we're given that at an altitude of 12,000 ft, the atmospheric pressure is now:

p = 0.657 atm

Apply Henry's law using the constant we found:

S_2 = k_H \chi_{O_2} p = 0.001278 M/atm\cdot 0.209\cdot 0.657 atm = 1.75\cdot 10^{-4} M

8 0
3 years ago
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