CHEMISTRY HIGH SCHOOL

Friends can __________. A.

help you learn about yourself and how to get along with others


B.

show you a different aspect of the world


C.

give you a sense of belonging and a safe place to talk


D.

all of the above

Answers

Answer 1
Answer:

Answer:

the answer would be d. all of the above

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I need help with energy
The increase of this pigment molecule in the blood induces the yellowish color of the skin described as Jaundice. (a) Stercobilin (b) Bilirubin (c) Urobilin (d) Hemoglobin
A sulfur atom has 16 protons and 16 electrons. If you add a proton to a sulfur atom, what have you done? Created an isotope of sulfur. Created a positively charged ion of sulfur. Created a negatively charged ion of sulfur. Converted the atom into a different element.
Given the balanced equation representing a reaction at 101.3 kPa and 298 K:N2(g) + 3H2(g) => 2NH3(g) + 91.8 kJ Which statement is true about this reaction? (1) It is exothermic and DH equals -91.8 kJ. (2) It is exothermic and DH equals +91.8 kJ. (3) It is endothermic and DH equals -91.8 kJ. (4) It is endothermic and DH equals +91.8 kJ.

A carbon-12 atom has a mass of 12.00000 amu. The mass of a proton is 1.00728 amu, and the mass of a neutron is 1.00866 amu. How many protons does the carbon-12 atom have? How many neutrons does the carbon-12 atom have? What is the mass defect of a carbon-12 atom? amu

Answers

A carbon - 12 atom and a regular carbon atom would have the same number of protons which is 6. So a carbon - 12 atom would have 6 protons. Both, however, would differ in the number of neutrons. Carbon - 12 atom has 6 neutrons. To determine the mass defect of a carbon - 12 atom, we have to add the total mass of protons and the total mass of neutrons and subtract the known mass of a carbon - 12 atom. That would be like this.
6 (1.00728 amu) + 6 (1.00866 amu) = x
6.04368 amu + 6.05196 amu = x
12.09564 amu = x

Then subtract it with 12 amu to get the defect mass

12.09564 amu - 12.00000 amu = y
0.09564 amu = y

So the defect mass would be 0.09564 amu.

1) The number of protons in an element defines its atomic number, and for carbon, it is 6. 2) Number of neutrons in a carbon-12 atom is 6. 3) The mass defect of a carbon-12 atom is 0.09564 amu.

To determine the number of protons and neutrons in a carbon-12 atom and the mass defect, we need to use the given atomic masses of a proton and a neutron.

Number of protons in a carbon-12 atom:

Carbon-12 is the most common isotope of carbon, and it contains 6 protons. The number of protons in an element defines its atomic number, and for carbon, it is 6.

Number of neutrons in a carbon-12 atom:

The mass number of an isotope will be the sum of protons as well as neutrons in its nucleus. For carbon-12, the mass number is 12 amu. Since we already know it has 6 protons, the number of neutrons can be calculated as follows:

Number of neutrons = Mass number-Number of protons

Number of neutrons = 12 amu-6 protons

Number of neutrons = 6 neutrons

Mass defect of a carbon-12 atom:

The mass defect is the difference between the actual mass of a nucleus and the sum of the masses of its individual protons and neutrons.

Mass defect = (Mass of protons + Mass of neutrons) - Actual mass of carbon-12

Mass of protons = 6 protons × 1.00728 amu/proton = 6.04368 amu

Mass of neutrons = 6 neutrons × 1.00866 amu/neutron = 6.05196 amu

Actual mass of carbon-12 = 12.00000 amu

Mass defect = (6.04368 amu + 6.05196 amu) - 12.00000 amu

Mass defect = 12.09564 amu - 12.00000 amu

Mass defect = 0.09564 amu

So, the mass defect of a carbon-12 atom is 0.09564 amu.

To know more about mass defect here

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What is the name of the flower part that elevates the stigma

Answers

The style raises the stigma above the base of the flower and separates it from the ovary.

What is the mass of an electron?A. Electrons do not have mass.
B. -1.0 amu
C. 0.0005 amu

Answers

Option C: 0.0005 amu (i.e. atomic mass units), approx.

Which substance below will exhibit hydrogen bonding between the molecules of the substance? a. CH₄
b. HBr
c. HCl
d. H₂O
e. H₂

Answers

I think it might just might be e

The molar mass of NH3 is 17.03 g/mol. The molar mass of H2 is 2.0158 g/mol. In a particular reaction, 0.575 g of NH3 forms. What is the mass, in grams, of H2 that must have reacted, to the correct number of significant figures?

Answers

The balanced chemical reaction is:

N2 + 3H2 = 2NH3

 

We are given the amount of ammonia formed from the reaction. This is where we start our calculations.

 

0.575 g NH3 (1 mol NH3 / 17.03 g NH3) (3 mol H2 / 2 mol NH3) ( 2.02 g H2 / 1 mol H2) = 0.10 g H2

Answer:

Answer is 0.102.    

Explanation:

At standard pressure, a certain compound has a low boiling point and is insoluble in water. At STP, this compound most likely exists as(1) ionic crystals
(2) metallic crystals
(3) nonpolar molecules
(4) polar molecules

Answers

At standard pressure, a certain compound has a low boiling point and is insoluble in water. At STP, this compound most likely exists as nonpolar molecules. Hence, option C is correct.

What are nonpolar molecules?

A molecule in which the individual dipoles cancel each other & result in zero net dipole moment is called a non-polar molecule.

Nonpolar molecules make weak attractions between molecules called van der Waals forces and they are loosely bound with each other.

Therefore, nonpolar molecules can easily go to the atmosphere by breaking those weak bonds and having a boiling point low.

Hence, option C is correct.

Learn more about the nonpolar molecules here:

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Answer is (3) - nonpolar molecules.

Nonpolar molecules make weak attractions between molecules called van der Waals forces. Hence, they are looesly bound with each other. Therefore, nonpolar molecules can easily go to the atmosphere by breaking those weak bonds. Hence, the boiling point is low.

Since water is a polar solvent, nonpolar molecules do not soluble in water.

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