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4 years ago

Charles Darwin developed a theory about:

2 answers:

8 0

The answer is Coral Reef Formation. Charles Darwin developed a theory about Coral Reef Formation. He contributed to marine biology through study of coral reef formation. <span>Darwin's theory states that coral reefs formed as the islands and surrounding areas of crust subsided has been supported by modern investigations. </span>

marysya [2.9K]4 years ago

6 0

Answer:

The correct answer is "coral reef formation".

Explanation:

Darwin is known worldwide for his theory of evolution. But he also proposed a theory of how isolated coral reef rings were formed. He deduced that they originally grew around extinct volcanoes, which then sank under the sea, leaving the reef as an isolated circle corresponding to the opening it had.

Have a nice day!

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A 25.0 L tank of nitrogen gas is at 25 oC and 2.05 atm . If the temperature stays at 25 oC and the volume is decreased to 14.5 L

NeTakaya

Answer:

$\boxed {\boxed {\sf P_2 \approx 3.53 \ atm}}$

Explanation:

In this problem, the temperature stays constant. The volume and pressure change, so we use Boyle's Law. This states that the pressure of a gas is inversely proportional to the volume. The formula is:

$P_1V_1=P_2V_2$

Now we can substitute any known values into the formula.

Originally, the gas has a volume of 25.0 liters and a pressure of 2.05 atmospheres.

$25.0 \ L * 2.05 \ atm = P_2V_2$

The volume is decreased to 14.5 liters, but the pressure is unknown.

$25.0 \ L * 2.05 \ atm = P_2 * 14.5 \ L$

Since we are solving for the new pressure, or P₂, we must isolate the variable. It is being multiplied by 14.5 liters and the inverse of multiplication is division. Divide both sides by 14.5 L .

$\frac {25.0 \ L * 2.05 \ atm }{14.5 \ L}=\frac{P_2 *14.5 \ L}{14.5 \ L}$

$\frac {25.0 \ L * 2.05 \ atm }{14.5 \ L}= P_2$

The units of liters cancel.

$\frac {25.0 * 2.05 \ atm }{14.5 }=P_2$

$\frac {50.25\ atm }{14.5 }=P_2$

$3.53448276 \ atm = P_2$

The original values of volume and pressure have 3 significant figures, so our answer must have the same.

For the number we found, that is the hundredth place.

3.53448276

The 4 in the thousandth place (in bold above) tells us to leave the 3 in the hundredth place.

$3.53 \ atm \approx P_2$

The new pressure is approximately <u>3.53 atmospheres.</u>

8 0

3 years ago

What is the mass of a 1.71-l sample of a liquid that has a density of 0.921g/ml?

Temka [501]

Hey there!:

Volume in mL :

1.71 L * 1000 => 1710 mL

Density = 0.921 g/mL

Therefore:

Mass = Density * Volume

Mass = 0.921 * 1710

Mass = 1574.91 g

8 0

3 years ago

How do you tell if elements have similar chemical properties periodic table?

Oksi-84 [34.3K]

Whether or not they are within the same group (vertical columns) within the periodic table, determines similarity of chemical properties.

5 0

3 years ago

An FM radio station broadcast at a frequency of 98.5 MHz. What is the wavelength of the station’s broadcast signal?

Troyanec [42]

Answer:

(1 MHz = 106 s -1)

Explanation:

4 0

3 years ago

How many grams of NaOH are needed to make 500 mL of a 2.5 M NaOH solution

Veronika [31]

The number of grams of NaOH that are needed to make 500 ml of 2.5 M NaOH solution

calculate the number of moles =molarity x volume/1000

= 2.5 x 500/1000 = 1.25 moles

mass = moles x molar mass of NaOH

= 1.25 x40= 50 grams of NaOH

4 0

4 years ago