What is the pressure of 64 grams of O2 in a 1L container at a temperature of 10°C?

Answers

Answer 1

Answer: So PV=nRT
P=?

We know that:
-V=1L
-R=8.314kPa•L/mol•K
-T=10°C (we need to converse °C in K so 10+273) =283K
For n, we know that we have 64g of O2 and were looking for the quantity of mole in these 64g. 1 mole of O2 is 15.999g so 64g would be 4.0mol ((64g • 1mol)/15.999g) so n=4.0

P•1L= 4.0mol • 8.314kPa•L/mol•K • 283K
P • 1L = 9411
P = 9411/1L
P = 9411kPa

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What material would be the best choice for the support beams of a building

Answers

Answer:

Steel.

Explanation:

Hello,

Based on the high breaking down, corrosion and shearing resistance steel has, it is by far the best option to be chosen in order to support the beams in a building.

Best regards.

Steel would be the best choice for support beams

What is the most abundant gas in Earth's present day atmosphere?methane
oxygen
carbon dioxide
nitrogen

Answers

nitrogen. air consists 78% of nitrogen gas

The answer is nitrogen

Elements on the periodic are arranged into groups and periods and ordered according to: a. atomic number b. number of proteins c. reactivity d. all of the above

Answers

Final answer:

Elements on the periodic table are arranged into groups and periods, and are ordered according to atomic number, not the number of proteins or based solely on reactivity. Each element's place is determined by the number of protons in its nucleus, which also typically equals the number of electrons. Elements in the same group, or column, share similar chemical properties.

Explanation:

The elements on the periodic table are indeed arranged into groups and periods, but they are ordered in line with their atomic number. This atomic number reflects the number of protons in an element's nucleus and also typically matches the number of electrons surrounding the nucleus. Elements in the same vertical column, known as a group, share similar chemical properties.

Each box on the periodic table represents an element, and contains its atomic number, symbol, average atomic mass and (sometimes) name. The elements are arranged in seven horizontal rows, known as periods or series, and 18 vertical columns, called groups. The properties of the elements are periodic functions of their atomic numbers, hence the arrangements.

The reactivity of elements does have a role to play in the periodic table, as element groups possess similar chemical behaviors due to the similar configurations of their outermost electron shell. However, this reactivity does not determine the ordering of elements on the periodic table as the atomic number does. The numbering of proteins error seems to be a typographical mistake as proteins aren't a determinant in the configuration of the periodic table.

Learn more about Periodic Table and Atomic Number here:

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4 Compared to the energy and charge of the electrons in the first shell of a Be atom, the electrons in the second shell of this atom have(1) less energy and the same charge
(2) less energy and a different charge
(3) more energy and the same charge
(4) more energy and a different charge

Answers

Moving the electron away from the nucleus requires energy, so the electrons in the outer shell will have more energy than ones in the inner shell. Electrons always have a charge of -1, so the charge in the inner and outer shell will be the same. Therefore the answer is 3

The electrons in the second shell of this atom have (3) more energy and the same charge compared to the first shell

Further explanation

Bohr's atomic model has shown the energy levels of electrons in the path of the atomic shell

The greater the value of n (the atomic shell, the main quantum number), the greater the energy level

In normal circumstances, electrons fill the shell at the lowest energy level starting from the shell K, L M and then N

When an atom gets energy from outside, the electrons will absorb energy so it moves to higher energy. This situation is called excited

Electrons will return to the original path or a lower energy level because the excited state is unstable. In this condition, the electron will release energy

The electron energy at the nth path can be formulated:

$\rm En=(-Rh)/(n^2)$

Rh = constant 2.179.10⁻¹⁸ J

So the electron transfer energy (ΔE)

ΔE = E end - E initial

From the electron transfer available, because the value of the Rh constant is the same, the effect is the value of n (shell) ⇒ 1 / n²

Electron configuration of Be (Beryllium) with atomic number 4

1s² 2s² or [He] 2s²

So in the first shell E = -1(n=1), the second shell E = -1/4(n=2)

So the energy value in the second shell is greater than the first shell

While the electron charge is still the same(-1) (such as protons with + charges and neutrons with neutral charges / 0)

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Mg(s) + 2HCl(aq) mc019-1.jpg H2(g) + MgCl2(aq)What is the most likely effect of an increase in pressure on this reaction?

The reactant surface area increases.

The reaction rate decreases.

The reaction is not affected at all.

The reaction stops completely.

Answers

The increase in pressure alters the equilibrium of the reaction. In this case, the number of gaseous products in the reactant side is zero while the product side contains 1 gaseous product. The increase in pressure favors the side with less number of gaseous molecules which is the reactant side. Hence, the reaction rate decreases.

Answer:

Explanation:

Which term describes a substance that increases the concentration of hydroxide ions in solution?Lewis definition of an acid
Arrhenius definition of a base
Bronsted-Lowry definition of a base
Bronsted-Lowry definition of an acid

Answers

Since the question pertains to hydroxide ions, or OH-, then we can be sure that the answer is a base. All we have to do is differentiate which of the definition is more appropriate. A Bronsted-Lowry base is defined as the substance that accepts a proton. An Arrhenius base is the substance that produces OH- during the acid-base reaction. Hence, the answer is Arrhenius definition base.

Answer

its B

Explanation:

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