What is the mass of NH4Cl that must dissolve in 200 grams of water at 50 degrees c to make a standard solution?

Answers

Answer 1

Answer:

Answer:

The mass is 104 grams.

Explanation:

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Describe what happens to a hydrogen bond between two water molecules

Answers

Explanation:

Hydrogen atoms of one water molecule are attracted towards the oxygen atom of a neighboring water molecule can be termed as an intramolecular bond.

Generally, the oxygen atom is partially negatively charged, and the hydrogen atom is partially positively charged, so an arttraction occurs which forms this hydrogen bond. The attraction of the O-H bonding electrons towards the oxygen atom leaves a deficiency on the far side of the hydrogen atom relative to the oxygen atom. The result is that the attractive force between the O-H hydrogen and the O-atom of a nearby water molecule is strong.

Atoms of different isotopes of the same element differ in their total number of electrons neutrons protons valence electrons

Answers

The ans is neutrons. Isotopes of the same element have the same number of protons(and neutrons) but different number of neutrons.

Which of the following molecules has polar bonds but is a nonpolar molecule?a. H₂
b. H₂O
c. NH₃
d. NaCl
e. CO₂

Can anyone explain this one?

Answers

H2: non polar bond. non polar molecule
H2O: polar bonds, but there is a angle between 2 H-O bonds. so it's a polar molecule
NH3: polar bonds, but it's a stereochemical structure, like a pyramid with triangle base, N is the vertex. polar molecule.
NaCl: polar bond, polar molecule.(ion bond)
CO2: 2 O atoms are at two sides of C atom horizonally. giving CO2 a symmerical structure. it's nonpolar molecule with 2 polar bonds.

Final answer:

Carbon dioxide (CO₂) is a molecule with polar bonds but is considered nonpolar due to its linear shape.

Explanation:

In order to determine whether a molecule is polar or nonpolar, we must consider both the polarity of the individual bonds and the molecular geometry. A molecule with polar bonds can be nonpolar if the bond polarities cancel each other out due to the overall molecular shape.

Out of the given options, the molecule that has polar bonds but is nonpolar is CO₂. Carbon dioxide has two polar bonds between carbon and oxygen, but the molecule has a linear shape, which results in the bond polarities canceling each other out, making the molecule nonpolar.

Learn more about Polarity of Molecules here:

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What are the effects of baking powder solution on dilute hydrochloric acid solution

Answers

Combining an acid with a base typically results in water and salt. In some cases, these reactions release gas and heat as well. Mixing baking soda, or NaHCO3, with hydrochloric acid, or HCl, results in table salt, NaCl, as well as water, H2O, and carbon dioxide, CO2.
:)

Used to deliver acids and bases in a titrationa. calorimeter
b. Geiger counter
c. Burette
d. Funnel
e. Bunsen burner

Answers

c) burette

we just did a titration lab in class :)

Which statement is true about BF3, a nonpolar molecule? It has nonpolar bonds and a symmetrical structure. It has nonpolar bonds and an asymmetrical structure. It has polar bonds and a symmetrical structure. It has polar bonds and an asymmetrical structure. It has ionic bonds and symmetrical structure.

Answers

I think the correct answer is the first option. It has nonpolar bonds and a symmetrical structure. The structure of a BF3 molecule shows a symmetrical trigonal geometry. The net dipole moment of the molecule is zero therefore it is polar.

Answer: It has polar bonds and a symmetrical structure.

Explanation:

Formula used for calculating hybridization

$:{\text{Number of electrons}} =(1)/(2)[V+N-C+A]$

where, V = number of valence electrons present in central atom i.e. boron= 3

N = number of monovalent atoms bonded to central atom=3

C = charge of cation = 0

A = charge of anion = 0

$BF_3$

${\text{Number of electrons}} =(1)/(2)[3+3-0+0]=3$

The number of electrons is 3 that means the hybridization will be $sp^2$ and the electronic geometry of the molecule will be trigonal planar.

Thus as there are no lone pair of electrons, there is no distortion and the molecule is symmetrical. The B-F bonds are polar due to electronegativity difference but the polarities cancel due to symmetrical structure.

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For the reactions system 2H2(g) + S2(g) 2H2S(g), a 1.00 liter vessel is found to contain 0.50 moles of H2, 0.020 moles of S2, and 68.5 moles of H2S. Calculate the numerical value of the Keq of this system. K = Are the products or reactants favored? The equilibrium system N2O4(g) 2NO2(g) was established in a 1.00-liter vessel. Upon analysis, the following information was found: [NO2] = 0.500 M; [N2O4] = 0.0250 M. What is the value of Keq? 3.Which is the correct expression for Keq when the chemical reaction is as follows: N2 + 3H2 2NH3. 4.Reactions which do not continue to completion are called ______reactions.