Molarity=Moles of solute
Volume of SOLUTION
And we get an answer with units, mol⋅L−1
Explanation:
So all we need to do is to set up this quotient. You have been given the amount of solute in moles, and the volume of solution.
So, Molarity=3⋅mol
4⋅L. =??mPol⋅L−1?In 1L of this solution, what is the mass of the NaCl solute?
M= 3 Moles/ 12 Liters = 0.25 M
PLEASE ANSWER AS FAST AS YOU CAN I'M ON A TIME LIMIT...
A student decides to conduct a comparative investigation to study properties of elements. What is a benefit of conducting a comparative investigation rather than a descriptive investigation?
A.It will be less time-consuming to collect data about elements.
B.It will show a cause-and-effect relationship between two properties of elements.
C.It will be less expensive to collect data and make observations about elements.
D.It will provide much more information about properties of elements.
Answer:
Explanation:
I think its B...
Elements in the same group have _____.
a. the same number of electron shells
b. the same number of protons
c. similar chemical properties
d. the same number of isotopes
Similar chemical properties
(OPTION C)
Answer:
similar chemical properties
Explanation:
i can confirm his answer
how human activity can affect the carbon cycle
Answer:
Human activities have a tremendous impact on the carbon cycle. Burning fossil fuels, changing land use, and using limestone to make concrete all transfer significant quantities of carbon into the atmosphere. This extra carbon dioxide is lowering the ocean's pH, through a process called ocean acidification.
Significant amounts of carbon are released into the atmosphere as a result of the burning of fossil fuels, changing how land is used, and the production of concrete with limestone.
What is carbon cycle?The flow of carbon on earth in its elemental and mixed phases is represented by the carbon cycle. The elemental kinds of carbon are diamond and graphite, and when they are mixed, they are found as carbonates throughout minerals as well as carbon dioxide gases throughout the atmosphere. Carbon is returned to the atmosphere as plants and animals perish and are degraded.
Plants use carbon from the atmosphere to produce photosynthesis. Animals eat these plants, which causes carbon to bioaccumulate in their bodies. Significant amounts of carbon are released into the atmosphere as a result of the burning of fossil fuels, changing how land is used, and the production of concrete with limestone. The carbon cycle is greatly impacted by human activity.
Therefore, significant amounts of carbon are released into the atmosphere as a result of the burning of fossil fuels, changing how land is used, and the production of concrete with limestone.
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Use the conservation of mass to explain why a rusty nail weighs more than the original nail.
What was Anton van Lee
I would say the answer is A.
Which of the following statements is correct in regards to density?
A-Pressure is directly proportional to density.
B-Pressure is inversely proportional to density.
C-Temperature is directly proportional to density.
D-Temperature and pressure do not affect density.
A is the answer i dont really know but i think is right
Answer : The correct option is, (A) Pressure is directly proportional to density.
Explanation :
Density : It is defined as the mass contained per unit volume.
Formula used for density :
[tex]Density=\frac{Mass}{Volume}[/tex]
From this we conclude that, the density depends on mass and volume of substance.
The density is directly proportional to the mass of substance and inversely proportional to the volume of substance.
[tex]Density\propto \frac{1}{Volume}[/tex]
And as we know that, the volume is also depends on pressure and temperature. That means,
Volume is directly proportional to the temperature and inversely proportional to the pressure.
[tex]Volume\propto Temperature\\\\Volume\propto \frac{1}{Pressure}[/tex]
From this we conclude that,
The relation between the density, volume and pressure is:
[tex]Density\propto \frac{1}{Volume}\propto Pressure[/tex]
The relation between the density, volume and temperature is:
[tex]Density\propto \frac{1}{Volume}\propto \frac{1}{Temperature}[/tex]
From the given option, only option A is correct option. While the other options are incorrect.
Hence, the correct option is A.
Nitrogen and oxygen are _____ gases in the atmoshere.
Trace
Variable
Primary
Rare
Nitrogen and oxygen are primary gases in the atmosphere.
Trace
Variable
Primary
Rare
They are he Primary gasses in the atmosphere with the percentages being 78% nitrogen, 21% oxygen
hope this has helped
How many grams of N2 are required to make 75 grams of NH3?
Answer:
2.138 I think
Explanation:
N2 + 3H2 -> 2NH3
This means that 3 moles of H2 gives 2 moles of NH3
Lets convert 12.12 g of NH3 into moles.
The molecular weight of NH3 is 17 g/mol
So 12.12 g is 0.713 moles
If 2 NH3 comes from 3 moles of H2
1 mole comes from 1.5 moles of H2
So 0.713 moles of NH3 comes from 1.5 x 0.713 moles of H2 =1.069 moles of H2
1 mole of H2 weights 2g
So 1.069 moles of H2 weighs 2.138 g
I don’t know it A is correct please tell me the right answer
I do believe the answer is A. Hope this helps.
I think A would be the correct answer
In the following reaction, 2SO3 (g) ↔ 2SO2 (g) + O2 (g), removing O2 (g) would shift the reaction in which direction?
SELECT AN ANSWER
right - towards the products
left - towards the reactants
Answer:
right - towards the products.
Explanation:
Le Châtelier's principle states that when there is an dynamic equilibrium, and this equilibrium is disturbed by an external factor, the equilibrium will be shifted in the direction that can cancel the effect of the external factor to reattain the equilibrium.By removing oxygen from the reaction, this means that the concentration of the products is decreased.
To attain the equilibrium again, the reaction is shifted toward the products side.
So, the right choice is: right - towards the products.
All of these may be classified as
What is it that you’re asking for?
Answer:
Where is the chart
Explanation:
Which process is most responsible for creating the Earth's magnetic field? A. the motion of the Moon as it revolves around the Earth B. the movement of the Earth through space C. the impact of charged particles from the Sun D. the rotational motion of the Earth and its iron core
the rotational motion of the Earth and its iron core-
Final answer:
The Earth's magnetic field is created by the motion of the Earth's liquid iron outer core, driven by thermal and compositional currents, and the rotational motion of the Earth. This generates electrical currents that are responsible for the magnetic field, making answer D. the rotational motion of the Earth and its iron core the correct one.
Explanation:
Earth's magnetic field is primarily generated by the convective movements of molten metal within its outer core. This movement, coupled with the Earth's rotation, produces electrical currents that generate the magnetic field. These currents of liquid iron create dynamic magnetic fields through a self-sustaining process involving Ampère's law and Faraday's law, which describe the interplay between electric currents and magnetic fields.
This activity in the Earth's outer core is what results in the geomagnetic field that extends far into space, providing a shield against harmful radiation from the sun, including plasma from the solar wind, and contributing to phenomena like the Aurora Borealis.
Therefore, the correct answer is D. the rotational motion of the Earth and its iron core.
Which of the following is a possible set of quantum numbers for an electron?
(1, 1, 0, +½)
(2, 1, 2, +½)
(3, 2, 0, -½)
(3, -2, 1, -½)
answer is one first one for one electron.
what kind of solid often has the highest melting points?
A.) solids made of nonpolar molecules
B.) solids made of atoms
C.) solids made of ionic bonds
D.)solids made of polar molecules
B solids made of atoms
Solids with the highest melting points are typically those with either covalent networks or ionic bonds, due to the strength of their atomic or ionic interactions. So the correct option is C.
Explanation:The type of solid that often has the highest melting points are those made of atoms arranged in a covalent network or those formed by ionic bonds. Solids that consist of ionic bonds, such as sodium chloride (NaCl), typically have high melting points due to the strong electrostatic interactions between the positively and negatively charged ions within a crystal lattice. Similarly, materials with a covalent network, like diamond or silicon dioxide (SiO2), have very high melting points because they consist of a three-dimensional array of covalently bonded atoms that require a lot of energy to break apart. In contrast, molecular solids composed of nonpolar or polar molecules have lower melting points due to their weaker intermolecular forces, such as London dispersion forces, dipole-dipole interactions, and in some cases, hydrogen bonding.
Beginning with commercial grade hydrochloric acid, 1.00 • 10^2 mL of a 12.4 M HCl is added to water to bring the total volume if the solution to 0.820L. What is the concentration of this new solution?
how to find the number of neutrons in an atom
You can find the number of neutrons in an atom by subtracting the atomic number from the mass number.
How to find the number of neutrons ?The mass number of an atom is the total number of protons and neutrons in the nucleus of the atom. The atomic number of an atom is the number of protons in the nucleus of the atom. Both the mass number and the atomic number can be found on the periodic table of elements.
To find the number of neutrons in an atom therefore, you can use the following formula:
Number of neutrons = Mass number - Atomic number
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A radioactive isotope has a half-life of 10 years. What fraction of the original mass will remain unchanged after 50 years
The fraction is calculated like this:
[tex] \frac{1}{ {2}^{50 \div 10} } = \frac{1}{32} [/tex]
If you want an universal equation for all problems like this:
[tex] \frac{1}{ {2}^{time \div halflife} } [/tex]
The fraction of the original mass of the radioactive isotope with a half-life of 10 years that will remain after 50 years is 1/32.
We can find the fraction of the original mass with the exponential decay equation:
[tex] N(t) = N_{0}e^{-\lambda t} [/tex] (1)
Where:
N(t): is the amount of radioactive isotope at time t
N₀: is the initial amount of radioactive isotope
λ: is the decay constant
t: is the time = 50 y
We can find the decay constant as follows:
[tex] \lambda = \frac{ln(2)}{t_{1/2}} [/tex] (2)
Where:
[tex]t_{1/2}[/tex]: is the half-life of the isotope = 10 y
The decay constant is (eq 2):
[tex] \lambda = \frac{ln(2)}{t_{1/2}} = \frac{ln(2)}{10 y} = 0.069 y^{-1} [/tex]
Now, the fraction of the original amount is (eq 1):
[tex] \frac{N(t)}{N_{0}} = e^{-\lambda t} = e^{-0.069 y^{-1}*50 y} = 0.0317 [/tex]
Since we need to calculate the fraction of the original mass, after some algebraic operations we have:
[tex] \frac{N_{0}}{N(t)} = 32 [/tex]
[tex] N(t) = \frac{1}{32}N_{0} [/tex]
Therefore, the fraction of the original mass that will remain is 1/32.
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What is an important step to determine the number of grams of SO3 that can be produced by reacting 6 moles of SO2 with oxygen in the synthesis reaction below. 2 SO2(g) + O2(g) —>2 SO3(g)
Answer:
480.40 g.
Explanation:
According to the balanced equation:2 SO₂(g) + O₂(g) → 2 SO₃(g),
it is clear that 2.0 moles of SO₂ react with 1.0 mole of oxygen to produce 2.0 moles of SO₃.
We can get the no. of moles of SO₃ produced:∵ 2.0 moles of SO₂ produce → 2.0 moles of SO₃, from the stichiometry.
∴ 6.0 moles of SO₂ produce → 6.0 moles of SO₃.
Then, we can get the mass of the produced 6.0 moles of SO₃ using the relation:mass = no. of moles x molar mass of SO₃ = (6.0 moles)(80.066 g/mol) = 480.396 g ≅ 480.40 g.
What are the mountainous parts of the moon called? Question 3 options: craters terrae maria regolith
Answer:
Terrae
Explanation:
The mountainous parts of the moon are referred as Terrae. These are bright regions on the moon. Most of the surface of the moon is covered these highlands.
Craters are the depressions created on the surface of the moon as the space rocks strike.
Maria are the dark areas on the surface of the moon. These areas are filled with solidified lava.
Regolith constitutes the upper loose layer of soil, dust, broken rocks and other materials.
What is the empirical formula for the compound: C8H8S2?
A. CHS
B. C2H2S0.5
C. C8H8S2
D. C4H4S
The answer is:
D.[tex]C_{4}H_{4}S[/tex]
Why?The empirical formula of a compound is the simplest formula of the same compound, if we are given the molecular formula, we can calculate the empirical formula by finding the mole ratio of each element of the compound.
So, if we know the empirical formula we will be able to get the molecular formula by multiplying it by the mole ratio.
Then, which of the options can give as a result the given molecular formula?
The answer will be D.[tex]C_{4}H_{4}S[/tex] because if we multiply it by 2(mole ratio), it will give us as a result : [tex]C_{8}H_{8}S_{2}[/tex]
[tex]2*(C_{4}H_{4}S)=C_{8}H_{8}S_{2}[/tex]
Have a nice day!
A chemist is using a solution of HNO3 that has a pH of 3.75. What is [H+] for the solution? 1.78 × 10n M n =
Answer:
The concentration of [tex]H^+[/tex] ions in the solution is [tex]1.778\times 10^{-4} M[/tex].
Explanation:
The pH of the solution is defined as negative logarithm of [tex]H^+[/tex] ion concentration.
[tex]pH=-\log[H^+][/tex]
The pH of the nitric acid solution = 3.75
[tex]3.75=-\log[H^+][/tex]
[tex][H^+]=Antilog [-3.75]=0.0001778=1.778\times 10^{-4} M[/tex]
The concentration of [tex]H^+[/tex] ions in the solution is [tex]1.778\times 10^{-4} M[/tex].
Answer:
1st Question: 1.78 / -4
2nd Question: A
Explanation:
Source: Dude trust me
Find the concentration of H+ ions at a pH = 11 and
pH = 6. Then divide the concentration of H+ ions at a
pH = 11 by the of H+ ions at a pH = 6. Record your answer in Table C.
What is the concentration of H+ ions at a pH = 11?
mol/L
What is the concentration of H+ ions at a pH = 6?
mol/L
How many fewer H+ ions are there in a solution at a
pH = 11 than in a solution at a pH = 6?
Answer:
for table C
Explanation:
What is the concentration of H+ ions at a pH = 11?
1. ⇒ 0.00000000001 mol/L
What is the concentration of H+ ions at a pH = 6?
2. ⇒ 0.000001 mol/L
How many fewer H+ ions are there in a solution at a
pH = 11 than in a solution at a pH = 6?
3. ⇒ 100,000
The concentration of H+ ions at pH 11 is 1.0 x 10^-11 mol/L and at pH 6 is 1.0 x 10^-6 mol/L. There are 100,000 times fewer H+ ions at a pH of 11 than at a pH of 6.
Explanation:The concentration of H+ ions in a solution can be calculated using the pH value, which is the negative logarithm (base 10) of the hydrogen ion concentration. Therefore, pH = -log[H+], and to find [H+], we can use the inverse logarithmic relationship: [H+] = 10^-pH.
For a solution with a pH of 11, the concentration of H+ ions would be: [H+] = 10^-11 mol/L, which equals 1.0 x 10^-11 mol/L.
For a solution with a pH of 6, the concentration of H+ ions would be: [H+] = 10^-6 mol/L, which equals 1.0 x 10^-6 mol/L.
To find how many fewer H+ ions are in a solution with a pH of 11 compared to a pH of 6, we divide the two concentrations: (1.0 x 10^-11 mol/L) / (1.0 x 10^-6 mol/L) = 1.0 x 10^-5. This means that the solution with a pH of 11 has 100,000 times fewer H+ ions than the solution with a pH of 6.
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What is the concentration of a solution?
Concentration Definition. In chemistry, concentration refers to the amount of a substance per defined space. Another definition is that concentration is the ratio of solute in a solution to either solvent or total solution. Concentration usually is expressed in terms of mass per unit volume.
How did Mendeleev feel about Russian science education when he came back from Germany
As he began to teach inorganic chemistry, Mendeleev could not find a textbook that met his needs. Since he had already published a textbook on organic chemistry in 1861 that had been awarded the prestigious Demidov Prize, he set out to write another one. The result was Osnovy khimii (1868–71; The Principles of Chemistry), which became a classic, running through many editions and many translations. When Mendeleev began to compose the chapter on the halogen elements (chlorine and its analogs) at the end of the first volume, he compared the properties of this group of elements to those of the group of alkali metals such as sodium. Within these two groups of dissimilar elements, he discovered similarities in the progression of atomic weights, and he wondered if other groups of elements exhibited similar properties. After studying the alkaline earths, Mendeleev established that the order of atomic weights could be used not only to arrange the elements within each group but also to arrange the groups themselves. Thus, in his effort to make sense of the extensive knowledge that already existed of the chemical and physical properties of the chemical elements and their compounds, Mendeleev discovered the periodic law.
Dimitri Mendeleev was the most noted Russian chemist who gave the periodic table. He gave the periodic table based on the atomic numbers and how they characterized the physical and chemical properties of the elements.
What were the thoughts of Mendeleev?When he came back to his homeland he began teaching inorganic chemistry but was not able to find a suitable textbook according to his need. He thought of writing another book as he was already awarded the prestigious Demidov Prize.As the result, he published the Principles of chemistry which is the most noted work of his and was translated to many languages.When he was studying the alkali group metals then he discovered that the properties according to the atomic numbers can be used to arrange the elements within themselves and in other groups.Therefore, he discovered the periodic table.
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how are cations formed
cations are formed when a metal loses electrons, and a nonmetal gains those electrons.
How quickly or slowly a substance heats or cools is measured by its
Specific Heat is the measure that how quickly or slowly a substance heats or cools.
What is Specific Heat ?Specific Heat is defined as the amount of required to raise the temperature of a substance by 1 degree Celsius.
The units of specific heat are usually calories or joules per gram per Celsius degree.
Specific Heat for water is 1 cal/gm /degree Celsius
Specific Heat is the measure that how quickly or slowly a substance heats or cools.
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Which is an example of a pure substance? A. coffee B. helium C. vinegar D. trail mix
B. Helium
It has only He atoms
what is burning in chemistry.
Fire is burning, which is combustion, and combustion is a type of oxidation reaction. Oxidation means combined chemically with oxygen . Oxidation is an exothermic reaction, meaning it gives releases heat energy.
for a is burning. which is combustion and that is a type of oxidation means to combine chemically with oxygen.
If the experiments data does not support the hypothesis what would a scientist do next?
A. Question their ability to be a scientist.
B. Discard the entire experiment as irrelevant.
C. Conclude the opposite of the hypothesis.
D. Ask more questions based on learning something from this experiment.
Ask more questions based on learning something from this experiment.
hope this helps :)
why is chlorine atom has atomic mass of 35.5 atomic mass unit
I’m not sure exactly what question you’re trying to ask, but I’ll give two answers:
1. The mass is reported as 35.5 amu because atomic weights are reported based on the weights and abundances of the isotopes of that element. For example, Hydrogen (which is typically understood to have only one proton, aka 1 amu) has a weight of 1.004 amu. This is because heavier isotopes of this element do exist but in very small quantities; however, they can still influence the “averaged” weight.
2. The weight of an atom is intrinsic based on its makeup - the number of each component influence the overall weight of the atom. In this case, Chlorine is comprised of the right number of protons and neutrons in the right occurrence and organization such that a weight of 35.5 amu is reported.
Hope this helps!