CHEMISTRY HIGH SCHOOL

An unknown solution has a ph of 8. how would you classify this solution? a. acidic
b. neutral
c. basic
d. there is not enough information to answer the question

Answers

Answer 1
Answer: I believe the correct answer from the choices listed above is option C. You would classify this solution as basic since it has the pH of more than 7 which signifies a basic solution. Hope this answers the question. Have a nice day. Feel free to ask more questions.

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At STP, which 2.0-gram sample of matter uniformly fills a 340-milliliter closed container?
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Argon has three naturally occurring isotopes: argon-36, argon-38, and argon-40. Based on argon's reported atomic mass, which isotope do you think is the most abundant in nature? Explain.

Answers

Answer:

argon-40

Explanation:

The relative atomic mass of Argon is 39.948. This is very close to the mass of argon-40. Usually, the relative atomic mass of an element is the sum of the percentage abundance of each isotope in nature multiplied by its mass. The result of this sum is normally biased towards the isotope with the highest abundance. In the case of argon, argon-40 must have the highest abundance, hence the value of the relative atomic mass.

Argon-40 is the most abundant isotope of argon in nature because the reported atomic mass of argon is closer to 40 atomic mass units.

Given that argon has three naturally occurring isotopes: argon-36, argon-38, and argon-40, compare their masses to determine which one is most likely to contribute the most to the average atomic mass of argon.

The atomic mass of argon is typically given as approximately 39.95 atomic mass units (u). This value is a weighted average of the masses of the different isotopes of argon, taking into account their relative abundance in nature.

Argon-36 has a mass of approximately 36 atomic mass units.

Argon-38 has a mass of approximately 38 atomic mass units.

Argon-40 has a mass of approximately 40 atomic mass units.

Since the reported atomic mass of argon is closer to 40 atomic mass units, it suggests that argon-40 is the most abundant isotope of argon in nature.

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Calculate the concentration (in molarity) of NaOH solution if 25.0mL of the solution are needed to neutralize 17.4 mL of a 0.132M HCL solution

Answers

Given:

25.0mL NaOH
17.4 mL of a 0.132M HCL

Required:

molarity of NaOH


Solution:

M1V1 = M2V2

(25.0mL) M1 = (0.132 M HCl)( 17.4 mL)

M1 = 0.092 M NaOH

V1 = 0.5 liters

Echoderms contain a what similar to the kind that vertebrates have

Answers

Echinoderms contain internal skeletons similar to the kind that vertebrates have. This internal skeleton is made up of calcium carbonate. They are marine animals. Some species of the echinoderm phylum include starfish, sea cucumbers and sea urchins.

Which element has the greatest density at stp? 1. carbon 2. copper 3. chlorine 4. calcium

Answers

Copper will have the greatest density, followed by calcium, another metal. Carbon will be the third most dense followed by chlorine, which, as a gas, will be MUCH less dense than the other 3

Final answer:

Among carbon, copper, chlorine, and calcium, copper has the highest density at standard temperature and pressure.

Explanation:

The element with the greatest density at standard temperature and pressure (STP) among the options given (carbon, copper, chlorine, calcium) is copper. Density, in elemental terms, is determined by the amount of mass packed in a given volume. Copper (Cu) has a density of approximately 8.96 g/cm^3 at STP, which is greater than that of carbon, chlorine, and calcium.

For comparison:
Carbon(C) has a significantly lower density at about 2.26 g/cm^3, chlorine (Cl) is a gas at STP and has a very low density of 0.003214 g/cm^3, and calcium (Ca) has a density of about 1.55 g/cm^3 at STP.

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Which of the following types of coal requires the most intense pressure in order to form?

Answers

Coal is ranked into four types depending on its carbon content. They are lignite, sub-bituminous, bituminous and anthracite. It is anthracite which has the highest carbon content thus the type of coal that needs more pressure to form. Also, it has the highest carbon content. 

Answer:

anthracite

Explanation:

simple

Which one is stronger acid with ph=5 or ph=2

Answers

pH=2. The lower the pH level, the higher the acidity is. Meanwhile, the higher the pH, the more basic the substance is
Each change in pH is a change in Hydrogen Ion concentration by a factor of 10. So a pH 2 acid is 1000 times stronger than a pH 5 acid.
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