Answer: The molar concentration of formic acid solution is 0.12 M
Explanation:
[tex]HCOOH\rightarrow HCOO^-+H^+[/tex]
cM 0 0
[tex]c-c\alpha[/tex] [tex]c\alpha[/tex] [tex]c\alpha[/tex]
So dissociation constant will be:
[tex]K_a=\frac{(c\alpha)^{2}}{c-c\alpha}[/tex]
Give c= ? and [tex]\alpha[/tex] = [tex]\frac{4}{100}=0.04[/tex]
[tex]2\times 10^{-4}=\frac{(c\times 0.04)^2}{(c-c\times 0.04)}[/tex]
On solving for c we get:
[tex]c=0.12M[/tex]
Thus molar concentration of formic acid solution is 0.12 M
What is a disadvantage of using solar energy?
I didn’t mean to click on a answer but help
Answer:
the cost is high..it uses alot of space...associated with pollution
Which of the following is true of SOLUBILITY?
A. if something is soluble, it will dissolve in anything
B. water will dissolve everything
C. substances often dissolve in some things and not others
Explain the following terms Sublimation
Answer:
Sublimation is the transition of a substance directly from the solid to the gas state, without passing through the liquid state. ... The reverse process of sublimation is deposition or desublimation, in which a substance passes directly from a gas to a solid phase.
What is the volume of 0.05 mol of neon gas
Answer:
1.12L
Explanation:
multiply 0.05 ×22.4
Which subatomic particle has no electric charge?
1) Electron
2) Neutron
3) Proton
4) Positron
Answer:
neutrons are uncharged and electrons are negatively charged
Determine the empirical formula of a
compound containing 2.6444g of gold
and 0.476g of chlorine.
Answer:
AuCl
Explanation:
Given parameters:
Mass of Gold = 2.6444g
Mass of Chlorine = 0.476g
Unknown:
Empirical formula = ?
Solution:
Empirical formula is the simplest formula of a compound. Here is the way of determining this formula.
Elements Au Cl
Mass 2.6444 0.476
Molar mass 197 35.5
Number of moles 2.6444/197 0.476/35.5
0.013 0.013
Divide by the
smallest 0.013/0.013 0.013/0.013
1 1
The empirical formula of the compound is AuCl
which atomic model has a positively charged nucleas and q negatively charged cloud of electrons giving the atom it's size?
Answer: In Thomson's model, the atom is composed of electrons surrounded by a soup of positive charge to balance the electrons' negative charges, like negatively charged “plums” surrounded by positively charged “pudding”. The 1904 Thomson model was disproved by Hans Geiger's and Ernest Marsden's 1909 gold foil experiment.
Explanation:
This is a collage question It's a hard one.
how can an xray image show differences between bone and soft tissues, such as muscles and lungs? How might the atoms that make up bones be different from the atoms that make up soft tissues?
Answer with Explanation:
1. An "x-ray image" shows the difference between the bones and soft tissues because the bones appear white in color while the soft tissues appear gray in color.
2. The reason behind the difference in the appearance of bones and soft tissues on the x-ray film is their density. Bones are denser than soft tissues, which means that its atoms are closely-knitted when compared to the soft tissues that are far apart from each other. This allows the x-ray radiation to be absorbed by the bone while it passes through most of the soft tissues.
This is the reason why pregnant women are advised not to undergo an x-ray examination because the fetus is denser and it will surely absorb the x-ray radiation.
An X ray is a X wave radiation that can penetrate from a high EMR and has wavelengths that are shorter than the UV rays. The concept of X rays where discovered in 1895.
The X ray image shows the difference between bones and the soft tissues. As the bones appear to be white in color and soft tissues appear grey in color. As lungs also consists of bones they can vividly shown. Due to the bones being made of calcium they are different form the atoms that makes the soft tissues.Learn more about the x-ray image show differences between bone and soft.
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A rectangular block of copper metal has a mass of 1896 grams. The volume of the block is 2cm^3. From this data, what is the density of the copper?(Please show how you got this answer)
What is the mass number of chlorine?
Answer:
Explanation:
35.453 u
Which element creates an ion who is LARGER in size than the original atom? Rb Rn S Ca
Answer:
The element S creates an ion which is larger in size than the original atom.
Explanation:
The atomic radius of elements is a measure of the size of atoms of elements. The atomic radius is defined as one-half the distance between the nuclei of identical atoms that are bonded together. Atomic radius increases on going down the group in the period table but decreases on going rom left to right across a period in the periodic able. The increase in atomic radius on going down the group is due to the addition of an extra electron shell to successive atoms of elements in a group. However, atomic radius decreases across a period due to increase in the positive charge of the nucleus of elements in the same period.
When atoms of elements form ions, the ionic radius of the resulting ion can either increase or decrease. For positive ions, the ionic radii decreases due to loss of electron increasing the attraction of the positive nucleus or even a complete loss of an electron shell. For anions, ionic radii increases due to gain of electrons which results in greater repulsion among neighboring electrons.
Among the elements given, rubidium (Rb), and calcium (Ca) for cations, hence, their size becomes smaller. Radon, Rn, being a noble gas is relatively inert, but forms positive ions when it does take part in reactions. Sulphur, S, however forms an anion, S²⁻, hence, its size increases.
Calculate the volume of hydrogen produced during the electrolysis of dilute sulphuric acid if you use a current of 1A for 15minutes?
Answer:
The volume of hydrogen gas produced is 0.104 L or 104 mL
Explanation:
In the electrolysis of dilute sulphuric acid, hydrogen gas is produced at the cathode while oxygen gas is given off at the anode in a ratio of 2:1.
At the cathode, the half reaction occurring is given as: 4H⁺(aq) + 4e⁻ ---> 2H₂(g)
From the equation of reaction, four moles of electrons are required to produce 2 moles of hydrogen gas at the cathode. Therefore, 2 moles of electrons will produce 1 mole of hydrogen gas.
1 mole of electron = 1 F = 96500 C
2 moles of electron = 193000 C
During the electrolysis experiment above, quantity of charged used, q = current(A) * time (s)
Q = 1 * 15 * 60 = 900 C
193000 C (2 moles of electron)of electricity produces 1 mole of hydrogen gas
900 C of electricity will produce 900 * 1 mole /193000 of hydrogen = 0.00466 moles of hydrogen
Molar volume of a gas at STP = 22.4 L
0.00466 moles of hydrogen occupies a volume of 0.00466 * 22.4 L = 0.104 L or 104 mL
Therefore, volume of hydrogen gas produced is 0.104 L or 104 mL
A van is traveling at 25.5 m/s starts to decrease steadily it comes to a complete stop in 7.65 seconds. What is the vans acceleration
Answer:
3.33
Explanation:
acceleration= vf-vi/t
Many disciplines are involved in environmental science, including chemistry and biology which ___ and economics and political science which __. Multiple choice question.
Answer:
Contribute evidence; help us understand how people use resources.
Explanation:
Environmental science can be defined as an interdisciplinary field of science that comprises of chemistry, economics, engineering, zoology, geography, geology, biology, ecology, physics, etc., used for the study and understanding of various environmental factors, issues in relation to human life.
Many disciplines are involved in environmental science, including chemistry and biology which contribute evidence and economics and political science which help us understand how people use resources in the production of goods and services to meet the need or requirements of consumer. These resources include land, labor, entrepreneurship and capital.
Which structures group together to form a system in the human body
Answer:
organs group together to form organ systems
Explanation:
Some students measure the acceleration of a wheeled cart being acted on by varying forces. The students record their data in the table shown above. According to the data table, how much force is acting on the cart when the students measure an acceleration of 2.6 m/s2?
A. 13 N
B. 7 N
C. 8 N
D. 12 N
F = 13 N
Further explanationGiven
Acceleration= a = 2.6 m/s²
Required
Force
Solution
Newton's second law :
ΣF = m x a
The wheeled cart used in the experiment is the same, so the mass used is the same
We use one of the data for example data 1 to find mass :
F = 1 N, a = 0.2 m/s²
m = F/a
m = 1/0.2
m = 5 kg
so for acceleration= a = 2.6 m/s² :
F = 5 kg x 2.6 m/s²
F = 13 N
Is this an element?
Cu20
O Yes, it's made of 1 type of atoms
O No it's made of more than 1 type of atoms
Answer:
Yes, its made of 1 types of atoms
Explanation:
Cu20 is Copper(I) oxide or cuprous oxide
Which material has been recycled for over 3,000 years?
A. metal
B. glass
C. paper
D. cloth
Answer:
B. glass
Explanation:
I did research about the topic.
What function does this cytoplasm perform in a plant and animal cells
Answer:
It helps shape, while holding and keeping organelles in their place.
Explanation:
Answer:
it holds the cell organelles
Explanation:
You are welcome
What does it mean when there is a coefficient placed before a molecule?
Provide two examples to explain your understanding.
Answer:
Coefficients are used in all chemical equations to show the relative amounts of each substance present. This amount can represent either the relative number of molecules, or the relative number of moles (described below). If no coefficient is shown, a one (1) is assumed.
Explanation:
Why is it important to know the properties of both solutes and solvents when preparing a solution that is expected to meet a certain need?
Answer:
property referring to the ability for a given substance the solute to dissolve in a solvent
1.
What part of the human body is the wing most like? ANSWER
Help
What part of the human body is most likely the wing would proabably from your elbow joint and the rest of your arm but most likely it would be the elbow joint.
17 points
Is this statement true or false?
The products of a chemical reaction have the same properties as the reactants.
true
false
Answer:
it is false...................
The products of a chemical reaction do not have the same properties as the reactants as they are changed during chemical change , hence the statement is false.
What is a chemical change?Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.
There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical changes:
1) inorganic changes
2)organic changes
3) biochemical changes
During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
Learn more about chemical change,here:
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What is a paleontologist?
Can someone please help me
Answer:
I would say w is the answer
Answer
The answer is W
What layer is made of metals and is a solid?
A.Mesosphere
B.inner core
C.outer core
Answer:
B Inner core because it has metals and solids
What amount if force need to be applied to a 20 kg bowling ball to give it an acceleration of 5m/s
Answer:
100N
Explanation:
Given parameters:
Mass of the bowling ball = 20kg
Acceleration = 5m/s²
Unknown:
Amount of force applied = ?
Solution:
To solve this problem, we apply newton's second law of motion.
Force = mass x acceleration
Now insert the parameters and solve;
Force = 20 x 5 = 100N
If one parent has sickle cell anemia and the other parent is a carrier, what is the possibility that their child will have sickle cell anemia
(d) In the laboratory, the temperature is 295 K and the total pressure in the gas-collecting tube is 741.2 mmHg . If the vapor pressure of water at 295 K is 19.8 mmHg , determine the pressure of the H2(g) in the gas-collecting tube.
Answer: The pressure of the hydrogen in the gas-collecting tube is 721.3 mm Hg
Explanation:
According to Dalton's law, the total pressure is the sum of individual pressures.
[tex]p_{total}=p_{H_2O}+p_{H_2}[/tex]
Given : [tex]p_{total}[/tex] =total pressure of gases = 741.1 mm Hg
[tex]p_{H_2O}[/tex] = partial pressure of water = 19.8 mm Hg
[tex]p_{H_2}[/tex] = partial pressure of hydrogen = ?
putting in the values we get:
[tex]741.1 mm Hg=19.8mmHg+p_{H_2}[/tex]
[tex]p_{H_2}=721.3mm Hg[/tex]
Thus the pressure of the hydrogen in the gas-collecting tube is 721.3 mm Hg
According to the Dalton Law in a blend of non-reacting gases, the entire pressure will be equivalent to the total of partial pressures of the individual gases.
The pressure of H₂ gas collected in the tube will be 721.3 mm Hg.
This can be calculated by:
Dalton's formula:
[tex]\text{p}_{\text{total}} & = \text{p}\text{H}_{2} \text{O} + \text{p} \text{H}_{2}[/tex]
Given :
[tex]\text{p}_{\text{total}}[/tex] = total pressure of gases = 741.1 mm Hg[tex]\text{p}\text{H}_{2} \text{O}[/tex] = partial pressure of water = 19.8 mm Hg[tex]\text{p} \text{H}_{2}[/tex]= partial pressure of hydrogen = ?Now using the formula we will calculate:
[tex]\text{741.1 mm Hg} & = \text{19.8 mm Hg} + \text{p} \text{H}_{2}[/tex]
[tex]721.3 \;\text {mm Hg} = \text{p} \text{H}_{2}[/tex]
Therefore, the pressure of the hydrogen in the tube is 721.3 mm Hg.
To learn more about Dalton Law follow the link:
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What would happen to the entropy in the reaction 2O^3(9) ► 3O^2 (g)?
O A. It decreases.
O B. It increases
O c. It stays the same.
O D. It is impossible to tell.