Answer:
[OH⁻] = 3.34x10⁻³M; Percent ionization = 0.54%; pH = 11.52
Explanation:
Kb of the reaction:
NH3 + H2O(l) ⇄ NH4+ + OH-
Is:
Kb = 1.8x10⁻⁵ = [NH₄⁺] [OH⁻] / [NH₃]
As all NH₄⁺ and OH⁻ comes from the same source we can write:
[NH₄⁺] = [OH⁻] = X
And as [NH₃] = 0.619M
1.8x10⁻⁵ = [X] [X] / [0.619M]
1.11x10⁻⁵ = X²
3.34x10⁻³ = X = [NH₄⁺] = [OH⁻]
[OH⁻] = 3.34x10⁻³M% ionization:
[NH₄⁺] / [NH₃] * 100 = 3.34x10⁻³M / 0.619M * 100 = 0.54%
pH:
As pOH = -log [OH-]
pOH = 2.48
pH = 14 - pOH
pH = 11.521.004 mol Arsenic is how many atoms?
Answer: [tex]6.047\times 10^{23}[/tex] atoms in 1.004 mol of arsenic
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the atoms, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given atoms}}{\text {avogadro's number}}[/tex]
[tex]1.004=\frac{x}{6.023\times 10^{23}}[/tex]
[tex]x=1.004\times 6.023\times 10^{23}=6.047\times 10^{23}[/tex]
Thus there are [tex]6.047\times 10^{23}[/tex] atoms in 1.004 mol of arsenic
A solid turning to a liquid is called..?
Answer:
A physical change.
Explanation:
Have a wonderful day!
In _____ , materials move from an area of higher concentration to an area of lower concentration through a cell membrane.
1.selective permeability
2.active transport
3.passive transport
Which is an empirical formula? C₂H₄ C₃H₆ P₂O₅ P₄O₆
Answer:
C3H8
Propane/Formula
Explanation:
hope this helps
Describe how an adaptation may have allowed giraffes to survive in savanna ecosystems
Write the name for the IONIC compound that contains two aluminum atoms and three sulfur atoms. (Need help ASAP)
Fossils can be found all over the world, often in layered rock formations. To determine the age of the rock layers within an
area, geologists and paleontologists use a technique called radiometric dating. Determining the age of a rock layer allows
scientists to determine the age of the fossils within it.
Some of the more exciting fossil discoveries are of dinosaurs, which existed on Earth between 230 and 65 million years
ago. Examine this map e. Click the map to zoom in, and drag the magnifying glass for a closer look. The map shows
where prehistoric rocks formed during the Triassic, Jurassic, and Crustaceous time periods, the same periods when
dinosaurs walked on Earth. Based on the map, what is the closest location to you where dinosaurs are likely to have lived?
Answer: Western USA.
Answer:
the answer is the question itself
Explanation:
Compounds that are ductile and excellent conductors of electricity have *
covalent bonds.
ionic bonds.
isotopic bonds.
metallic bonds.
Answer:
metallic bonds.
Explanation:
Generally, compounds that are ductile and excellent conductor of electricity have metallic bonds between them.
These compounds are usually metals.
Metallic bond join that atoms of metals and alloys together. The formation of this type of bond is favored by large atomic radius, low ionization energy and a large number of electrons in their valence shell. The physical properties of metals like ductility, malleability, electrical and thermal conductivity all results from metallic bonds.Brianna explains to Logan the role of plants in the carbon cycle. Choose the sentence(s) that she includes in her explanation. Select all that apply.
A.
Animals get carbon from plants.
B.
Plants take carbon from the soil.
C.
Photosynthesis uses carbon monoxide.
D.
Animals take carbon from the atmosphere.
E.
Plants take carbon from the atmosphere.
Answer:
E) Plants take carbon from the atmosphere
Explanation:
Plants are a vital part in keeping the air clean. They take in CO2, H2O, and sunlight to start processing photosynthesis. The carbon taken in by the plant still remains with it after it dies, thus, fossil fuels.
Answer:
e is correct
Explanation:
How does the number of molecules in 1 mol of oxygen compare with the number of molecules in 1 mol of nitrogen?
1 mol of oxygen has fewer molecules.
1 mol of oxygen has more molecules.
Each sample has the same number of molecules.
The molecules cannot be compared without knowing the mass.
Answer:
Each sample has the same number of molecules.
Explanation:
Just took the quiz on edge 2021
Taking into account the definition of Avogadro's number, each sample has the same number of molecules.
Avogadro's NumberAvogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole.
Avogadro's number applies to any substance.
This caseAvogadro's number applies to any substance. This means that the number of molecules in 1 mol of oxygen is equal to the number of molecules in 1 mol of nitrogen.
Finally, the correct answer is the third option: each sample has the same number of molecules.
Learn more about Avogadro's Number:
brainly.com/question/1445383
brainly.com/question/1528951
There are 2 grams of sulfur and 0.45 grams of copper. What is the
percent composition of coppper in the sample.
A. 18.3 %
B. 5.44 %
C. 81.6 %
D. 1.25%
Answer:
18.3%
Explanation:
Add the numbers together, and then take the number of grams of the substance, in this case copper, not coppper lol. divide the .45 by 2.45 to get 18.3
Which factor plays the most important role in allowing this reaction to occur?
5
What substance would do the best job of cleaning pots and
pans?
A
A substance with a pH of 7
B
A substance with a pH of 2
C
A substance with a pH of 4
D
A substance with a pH of 8
Answer:
D . A substance with a pH of 8
Explanation:
pH stands for "Potential for Hydrogen." This is an indicator of a solution's acidity or alkalinity. It is also used to tell which chemicals are great for cleaning.
pH 7 and pH 8 are both considered "neutral pH," thus, solutions with these pH are often used as dishwashing detergents because they do not destroy the surfaces of objects. However, pH 8 is said to be more alkaline in nature. This allows it to destroy the residues, such as fats and oils, in pots and pans. It is the pH of baking soda.
a sample of methane gas at a pressure of 0.727 atm and a temperature of 26.9 occupies a volume of 726 ml. if the gas is allowed to expand at constant temperature until its pressure is 0.412 atm, the volume of the gas sample will be _ mL
Answer:
1280L
Explanation:
Given parameters:
Initial pressure = 0.727atm
Temperature = 26.9°C
Initial volume = 726mL = 0.726L
New pressure = 0.412atm
Unknown:
New volume of the gas sample = ?
Solution:
To solve this problem, we apply boyles law;
P1V1 = P2V2
P and V are pressure and temperature
1 and 2 are initial and new state
0.727 x 0.726 = 0.412 x V2
V2 = 1.28mL = 1280L
Calculate the molar mass of NaNO3-
Explain, in your own words, what volumic mass is
plss helpp
Answer:
I think that volumic mass is like weight of an object, or like the space it takes up??
Explanation:
Have A Wonderful Day !!
How many moles are there in 2.43e+21 molecules of carbon dioxide?
Moles of Carbon dioxide : n = 4.037 x 10⁻³
Further explanationGiven
2.43 x 10²¹ molecules of Carbon dioxide
Required
Moles
Solution
1 mol = 6.02 x `10²³ particles(molcules, atoms, ions)
Can be formulated :
N = n x No
n = moles
No = Avogadro's number 6.02 x `10²³
moles of Carbondioxide :
n = N/No
n = 2.43 x 10²¹ / 6.02 x `10²³
n = 4.037 x 10⁻³
Plss answer the question in the picture.
1) Which electrons are involved in bonding between atoms?|
Answer:
VALENCE ELECTRONS are involved in the bonding of atoms
Explanation:
Hope that helps
how many element are there on the periodic table?
Answer:118
Explanation: it’s right
Answer:
118 elements
Hope that helps
A remnant or trace of an organism from the past is called a
Answer:
a fossil
Explanation:
Answer:Fossil
Explanation:A remnant or trace of an organism of a past geologic age, such as a skeleton or leaf imprint, embedded, and preserved in the Earth's crust, usually in stratified rock.
the bond between which two atoms is most polar
Answer:
bond
Explanation:
It is a polar bond because it is when two atoms bond
Identify the common name of this free-living organism.
Tubular organism with tentacles surrounding its mouth; a cnidarian
Hydra
SORRY I DON'T KNOW CORRECT BUT
I THOUGHT THATH THIS IS A CATEPILLAR
PLEASE THANKS THIS ANSWER
The abnormally high boiling point of HF as compared to HCl is primarily due to intermolecular forces of attraction called
A) network bonds
B) electrovalent forces
C) hydrogen bonds
D) van der Waals forces
Answer:
C) hydrogen bonds
Explanation:
The abnormally high boiling point of HF compared to HCl is primarily due to the intermolecular forces called hydrogen bonds.
Hydrogen bonds are intermolecular forces of attraction between polar molecules in which a hydrogen atom is directly joined to a highly electronegative atom (oxygen, nitrogen or fluorine).
Hydrogen bonds are very strong force of attraction compared to dipole - dipole attraction that holds the HCl together.
An ____,or an element located in group 7A, will form a salt when reacted with a metal atom.
A. Alkali metal
B. Halogen
C. Noble gas
D. Transition metal
Answer:
B. Halogen
Explanation:
Halogens are the family of chemical elements found in the group VIIA of the periodic table which means they possess seven (7) outer electrons. Some examples of halogens are Fluorine (F), Iodine (I), Bromine (Br), and Chlorine (Cl).
A halogen, or an element located in group 7A, will form a salt when reacted with a metal atom.
For example, when Chlorine reacts with Sodium it would form a salt known as Sodium Chloride.
Na + Cl ----> NaCl
Which of the following is one part of a chemical formula for a molecule?
A) A number that shows the total number of chemical bonds
B) Numbers that show how many atoms of each element are in the molecule
C) A number showing the atomic masses of each element
D) A Lewis dot diagram for the molecule
Which is a property of potassium (K)?
A. It is dull and brittle.
B. It is extremely reactive.
C. It is not reactive.
D. It is white and hard.
Answer:
B: It is extremely reactive
Explanation:
Potassium metal is also soft and white with a silvery lustre, has a low melting point, and is a good conductor of heat and electricity.
Answer: Properties, occurrence, and uses. Potassium metal is soft and white with a silvery lustre, has a low melting point, and is a good conductor of heat and electricity. Potassium imparts a lavender colour to a flame, and its vapour is green.
Explanation: hope it helps
Sodium bicarbonate (NaHCO3) is commercially known as baking soda. How many grams and atoms of oxygen are there in 15 grams of sodium bicarbonate? The molar mass of NaHCO3 is
84.01 g/mol.
Answer:
3 atoms of O
8.57g
Explanation:
The problem here is to find the mass of oxygen in the compound and the number of atoms of oxygen.
The formula of the compound is:
NaHCO₃;
Here we have:
1 atom of Na
1 atom of H
1 atom of C
3 atoms of O
So there are 3 atoms of O
To find the mass of oxygen , we use the molar mass of oxygen;
Molar mass of oxygen = 16g/mol
Mass of oxygen = [tex]\frac{3(16)}{84.01}[/tex] x 15 = 8.57g
AYOO SMART PEOPLE I NEED HELP on number 6
Answer:
6.) mixture
8.) compound
consider an atom that has an electron in an exicted state . the electron falls to a lower energy level . what effects does that have on the electron ?
Answer:
Each time an excited helium atom falls back from an excited state to its ground state or to a lower energy state, it emits a photon of radiation that shows up as this specific line-emission spectrum.
Explanation: