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3 years ago

Organisms with traits best suited to their environment, survive during what process?

1 answer:

6 0

Answer: According to Charles Darwin's theory of evolution by natural selection, organisms that possess heritable traits that enable them to better adapt to their environment compared with other members of their species will be more likely to survive, reproduce, and pass more of their genes on to the next generation.

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A researcher placed 25.0 g of silver chloride, AgCl, in sunlight and allowed the substance to decompose completely to form silve

steposvetlana [31]

Answer:

A. The law of definite proportions states that all pure samples of a particular chemical compound contain the same elements combines in the same proportion by mass.

B. The law of conservation of mass states that during ordinary chemical reactions, matter can neither be created or destroyed.

Note: The full question is as follows;

A researcher placed 25.0 g of silver chloride, AgCl, in sunlight and allowed the substance to decompose completely to form silver, Ag, with the release of chlorine gas, Cl2. The gas was collected in a container during the decomposition. The researcher determined that the mass of the silver formed was 18.8 g, and the mass of the chlorine gas formed was 6.2 g. The equation for the reaction is:

2AgCl ----> 2Ag + Cl2

a. State the law of definite proportions. Then use the researcher's data to confirm the law of definite proportions. Show your calculations.

b. State the law of conservation of matter. Then use the researcher's data to confirm the conservation of matter. Show your calculations.

Explanation:

A. Mass of silver obtained from AgCl = 18.8g.

Percentage mass of silver in the chloride = (18.8/25.0) * 100 = 75.2 %

Mass of chlorine obtained from AgCl = 6.2

Percentage mass of chlorine = (6.2/25) * 100 = 24.8 %

In one mole of AgCl with a molar mass of 143.3 g/mol; mass of silver = 107.8, mass of Cl = 35.5

Percentage mass of Ag = (107.8/143.3) * 100 = 75.2%

Percentage mass of Cl = (35.5/143.3) * 100 = 24.8%

Since the percentages by mass of Ag and AgCl obtained from the sample is the same to that obtained from a mole of AgCl, the law of definite proportions which states that all pure samples of a particular chemical compound contain the same elements combined in the same proportion by mass is verified.

B. Mass of reactant; AgCl sample = 25.0

Mass of products; At = 18.8 g; Cl = 6.2 g

Sum of products masses = 18.8 + 6.2 = 25.0 g

Therefore mass of reactant = mass of products.

This is in accordance with the law of conservation of mass which states that during ordinary chemical reactions, matter is neither created nor destroyed.

8 0

3 years ago

You have a HCl solution with a pH of 2. What is the [H+] of this solution?

Veseljchak [2.6K]

Answer:0.01

Explanation:

5 0

3 years ago

Why does temperature increase with altitude through the stratosphere? The stratosphere is closest to the sun. The ozone layer is

lukranit [14]

Temperature increase with altitude through the stratosphere because "<span>The ozone layer is found in the stratosphere".

Stratosphere is the second layer of the atmosphere of the Earth. 20% of the mass of the atmosphere is found in this layer.
</span><span>The temperature of the </span>stratosphere increases as the altitude increases due to the presence of the ozone layer in it as the ozone layer absorbs the ultraviolet radiations of the Sun which causes an increase in the temperature of this layer.

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3 years ago

Read 2 more answers

In Rutherford's gold foil experiment, most alpha particles passed through the gold foil without deflection and were detected on

Gwar [14]

Answer:

Option D.

Explanation:

Some of the alpha particles Rutherford shot at the gold foil bounced back, some scattered; but the majority of them went right through. That meant there had to be some sort of positively charged subatomic particle in there that pulled them through, but it had to be at the center and couldn't take up a lot of room.

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3 years ago

Calculate the pH at the equivalence point in the titration of 35.0 mL of 0.125 M methylamine (Kb = 4.4 × 10−4) with 0.250 M HCl.

Sergeeva-Olga [200]

Reaction of methyl amine with HCl (H+) is:

CH3NH2 + H⁺ ↔ CH3NH3⁺

At equivalence point:

moles of CH3NH2 = moles of HCl

moles of CH3NH2 = 0.350 * 0.125 = 0.0438 moles = moles of HCl

Volume of HCl = 0.0438 / 0.250 = 0.1752 L

Therefore, total volume at eq point = 0.350 + 0.1752 = 0.5252 L

Now, at equivalence point there is 0.0438 moles of CH3NH3+. The new equilibrium is :-

CH3NH3+ ↔ CH3NH2 + H+

where the concentration of CH3NH3+ = 0.0438/0.5252 = 0.083 M

Ka = [CH3NH2][H+]/[CH3NH3+]

Kw/Kb = x²/0.083-x

10⁻¹⁴/4.4*10⁻⁴ = x²/0.083-x

therefore x = [H+] = 1.37*10⁻⁶M

pH = -log[H+] = -log[1.37*10⁻⁶] = 5.86

8 0

3 years ago