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Alexandra [31]
3 years ago
10

Nitrogen makes up 78.08% of the volume of Earth's atmosphere, and oxygen makes up 20.95% of the volume. The total air pressure a

t sea level is 101.3 kPa. From this information, what can be calculated?
A. The parts per million, or number of molecules per 1 million molecules or other particles, of nitrogen and oxygen in Earth's atmosphere

B. The sum of the partial pressures of other gases (not nitrogen or oxygen) in Earth's atmosphere at sea level

C. The partial pressure of nitrogen and oxygen in Earth's atmosphere at sea level

D. All of the other answer choices
Chemistry
1 answer:
cestrela7 [59]3 years ago
3 0
D. All of the other answer choices
In the case of gases, the molar fraction is equivalent to the volume fraction which is also equal to the partial pressure fraction. Therefore, all of the given questions may be answered using the data that has been provided.
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#1: How are the elements arranged in the modern periodic table?
Alekssandra [29.7K]

1- The correct answer is C :


the elements arranged in the modern periodic table by increasing atomic number.


The explanation:


-The elements in the periodic table are arranged to increase the atomic number. All of these elements display several other trends and we can use the periodic law and table formation to predict their chemical, physical, and atomic properties.


2- The correct answer is C:


strontium, magnesium, calcium, beryllium are the elements which have similar properties.


The explanation:

-strontium, magnesium, calcium, beryllium, these belong to the alkaline earth metal group.

Because the outer electron structure in all of these elements is similar, they all have somewhat similar chemical and physical properties .

3- The correct answer is A :


Potassium


The explanation:


-The elements potassium and sodium have similar chemical properties because they have the same number of valence electrons and form +1 ions.



4- The correct answer is D


The explanation:


Mendeleev didn't include helium, neon, and argon in his periodic table because these elements had not yet been discovered.


5- The correct answer is B:


The periodic law describes trends seen across periods within the periodic table.


The explanation:


When the chemical elements are arranged, there is a pattern called the “periodic law” in their properties, in which elements in the same column (group) have similar properties


4 0
3 years ago
Read 2 more answers
Explain the difference between a physical property and chemical property. Give examples of each.
MA_775_DIABLO [31]
A physical property is what a substance is like; it's directly observable. On the other hand, a chemical property is how a substance behaves; its reactivity.

Examples of a physical property are: color, texture, boiling point, freezing point, and melting point.

Examples of a chemical property are: flammability, combustion, and formation of a precipitate.

3 0
3 years ago
Many protists are single-celled organisms. Which of the following characteristics is also common to organisms in Kingdom Protist
HACTEHA [7]

Protists belong to the group eukaryotes (having their DNA enclosed inside the nucleus). They are not plants, nimals or fungi but they act like one. They can be in general subgroups such as unicellular algae, protozoa and molds. They thrive in environments with little sunlight. The answer is letter B.

6 0
3 years ago
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Answer:

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8 0
3 years ago
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Draw the Lewis structure for BrCl3. What are the approximate bond angles about the central atom?
Korvikt [17]

Answer:

Explanation:

BrCl₃ is an interhalogen compound with a hybridization of sp³d. The approximate bond angles can be predicted from the structure (attached below). Although, the lewis structure might be predicted to be trigonal bipyramidal from the structure, it is however a T-shaped geometry because of it's two lone pairs.

Also, from the structure attached, it can be predicted that the approximate bond angles about the central atom is 120° (360 ÷ 3) since each of the three chlorine atoms is equally spaced about the central atom.

7 0
3 years ago
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