Answer:
Cr (NO2) 2
Explanation:
................
Can someone double check my work? (Ideal Gas Law Equation)
I am solving for the amount of moles in two gases.
For one, it was 4.75mL at 0.5C (273.65K) and 1.2atm.
n=(1.2*4.75)/(0.0821/273.65)=(5.7/22.456)=0.25361653 moles
For the other gas, it was 4.6mL at 0.5C and 1.2atm.
n=(1.2*4.6)/(0.0821/273.65)=(5.52/22.456)=0.24581403 moles
Please double check these for any errors in math or whatever. Thank you.
I did not see any errors, i may be wrong but what i can see is that it is correct
Enrichment of nuclear fuel 2 points A. increases the relative concentration of uranium-235 to 3-20% to produce energy in a power plant. B. increases the relative concentration of uranium-235 to 30-50% to avoid a nuclear explosion at higher percentages. C. increases the relative concentration of uranium-235 from 60% to 90% to achieve maximum electricity generation D. decreases the relative concentration of uranium-235 from 100% to 30-50% to avoid a nuclear explosion at higher percentages.
Answer:
B. increases the relative concentration of uranium-235 to 30-50% to avoid a nuclear explosion at higher percentages.
Explanation:
Uranium enrichment may be defined as a process which is necessary for creating effective nuclear fuel from the mined uranium by mainly increasing the percentage of the uranium-235 that undergoes fission with a thermal neutrons.
The enrichment process removes the unwanted uranium-238, thus making uranium 235 concentration higher. It takes up much work to increase the relative concentration of the uranium 235 to make it 30% to 50% so as to avoid a nuclear explosion at such higher percentages.
is it true or false?
Answer:
The rainforest is teeming with animals and insects, so you would hear humming. Frogs and birds make some of the loudest rainforest sounds.
howler monkeys, are the loudest so i think that its false cause lost of animals are there but some can be quiet
Name
12. A chemist places a piece of solid magnesium in an aqueous solution of copper (II)
sulfate and notices a reaction. Pieces of solid copper dropped out of the solution as a
precipitate and magnesium sulfate was formed.
a) Give a balanced formula equation (with state symbols) for this reaction (3 marks)
Answer:
Explanation: Mg(s) + CuSO4 (aq) -> Cu(s) + MgSO4 (aq)
what is the mass number for an atom that has 36 protons 36 electrons and 40 neutrons
Answer:
76
Explanation:
Mass number = number of protons plus the number of neutrons
So, 36 + 40 = 76
During the chemical reaction given below 21.71 grams of each reagent were allowed to react. Determine how many grams of the excess reagent are left over after the reaction is complete. 2SO2()+O2()⟶2SO3()
Answer: 16.32 g of [tex]O_2[/tex] as excess reagent are left.
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} SO_2=\frac{21.71g}{64g/mol}=0.34mol[/tex]
[tex]\text{Moles of} O_2=\frac{21.71g}{32g/mol}=0.68mol[/tex]
[tex]2SO_2(g)+O_2(g)\rightarrow 2SO_3(g)[/tex]
According to stoichiometry :
2 moles of [tex]SO_2[/tex] require = 1 mole of [tex]O_2[/tex]
Thus 0.34 moles of [tex]SO_2[/tex] will require=[tex]\frac{1}{2}\times 0.34=0.17moles[/tex] of [tex]O_2[/tex]
Thus [tex]SO_2[/tex] is the limiting reagent as it limits the formation of product and [tex]O_2[/tex] is the excess reagent.
Moles of [tex]O_2[/tex] left = (0.68-0.17) mol = 0.51 mol
Mass of [tex]O_2=moles\times {\text {Molar mass}}=0.51moles\times 32g/mol=16.32g[/tex]
Thus 16.32 g of [tex]O_2[/tex] as excess reagent are left.
What is a mole of something? Why do scientists use the concept of a mole?
Answer: A mole is a chemical unit to measure mass of substance.
Explanation:
A mole can be defined as 6.02214076 × 1023 of atoms, ions, molecules and others. A mole is the total amount of discrete entity within a substance present in the form of atoms, ions, and molecules. As atoms, ions, molecules are small entities within any substance so it is necessary to measure each of them and recognize them so the scientists development the concept of mole. It is the convenient unit of measurement because of the presence of greater number of molecules, atoms, and ions present in any substance.
Answer:
The mole is an SI unit used to measure the amount of any substance. One mole is exactly 6.02214076×10 23 particles.
Explanation:
The concept of the mole is important for scientists because it means that one mole of any element has exactly the same number of atoms as one mole of any other element. This information allows chemists to count atomic particles for even very complex chemistry formulas and reactions.
Calcium carbonate decomposes into
calcium oxide and carbon dioxide.
The mass of calcium carbonate that
decomposes is 57 g. At the end of
the experiment, the mass of the
products were only 45 g. What can
we conclude from this information?
Answer:
The mass of carbon dioxide formed is 12g.
object with a mass of 30 kg is observed to accelerate at the rate of 4 m/s2. Calculate the force required
Explain your observations in term of how tempurature affects paritcle motion and how liquid changes to a solid
Answer:
See explanation
Explanation:
Temperature is defined as a measure of the average kinetic energy of the molecules of a body.
When a substance is heated, the kinetic energy of its molecules increases as the temperature increases; hence the particles of the substance moves faster with increasing temperature.
When heat is withdrawn from a liquid, the temperature decreases and the average kinetic energy of the molecules decreases. The molecules become less energetic hence the liquid changes into solid
HELP ASAP !!! PLS ITS DUE IN LIKE 4 MINUTES
Answer:
they have the same structures in common
science:my chosen place is bonifacio global city
i choose this place because?
Answer:
Rewrite the following sentence in reported speech
The chair person said,"A hearty welcome to all present!"
Which of the following have London dispersion forces?
a. methane
b. carbon tetrachloride
c. bromine trifluoride
d. all of the above
Sulfuric acid reacts with aluminum hydroxide by double replacement producing aluminum sulfate and water Write chemical reaction. If 30 g of sulfuric acid reacts with 25 g of aluminum hydroxide, identify the limiting reactant?
Answer: [tex]H_2SO_4[/tex] is the limiting reagent.
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
The balanced chemical equation is:
[tex]3H_2SO_4(aq)+2Al(OH)_3(aq)\rightarrow Al_2(SO_4)_3(aq)+6H_2O(l)[/tex]
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} H_2SO_4 =\frac{30g}{98g/mol}=0.31moles[/tex]
[tex]\text{Moles of} Al(OH)_3=\frac{25g}{78g/mol}=0.32moles[/tex]
According to stoichiometry :
3 moles of [tex]H_2SO_4[/tex] require = 2 moles of [tex]Al(OH)_3[/tex]
Thus 0.31 moles of [tex]H_2SO_4[/tex] will require=[tex]\frac{2}{3}\times 0.31=0.21moles[/tex] of [tex]Al(OH)_3[/tex]
Thus [tex]H_2SO_4[/tex] is the limiting reagent as it limits the formation of product and [tex]Al(OH)_3[/tex] is the excess reagent.
How do you explain the ability of nonmetals to attract electrons to themselves?
Answer:
When these chemical bonds form, atoms of some elements have a greater ability to attract the valence electrons involved in the bond than other elements. Electronegativity is a measure of the ability of an atom to attract the electrons when the atom is part of a compound. Electronegativity differs from electron affinity because electron affinity
HOPE IT HELPS
Explanation:
Answer:
it is electronegativity and it increases as you move up and to the right on the periodic table and nonmetals are situated to the top right of the periodic table
Explanation:
A beaker contains a sample of water with a mass of 325 grams. The water in the beaker
is boiled and weighed again after it cools. The new mass of the water is 305 grams. In
this example of the conservation of matter in physical changes,
A. the mass is less after it cools because water has less mass as a gas.
B. the mass of the water was 305 grams and the mass of the water vapor was 20 grams.
C. the process of boiling destroyed 20 grams of the water and left 305 grams of water.
D. the heat energy created by boiling water makes up the rest of the mass.
Answer: a
Explanation:
Bc I just did it and yeah
NH₄⁺(aq)+NO₃⁻(aq) → NH₄NO₃(s)
How much energy is released when 3 moles of NH₄+ react?
1) -25.69 kJ
2) -51.38 kJ
3) -77.07 kJ
4) -102.76 kJ
What is defined as the plants and animals and the physical surroundings, including the sun, air, soil, and water?
Answer:
Ecosystem
Explanation:
The answer is ecosystem because the ecosystem includes the community such as living things and the enviornment of nonliving things such as the sun!
Answer:
ecosystem I'm pretty sure
A solute can be obtained from a solution by...
Answer:
Evaporating the solvent
Explanation:
What happens to pressure if temperature increases? Pressure increases. Pressure stays the same. Pressure decreases. Temperature has no effect on pressure.
Answer:
Pressure increases
Explanation:
According to Gay-Lussac's law, the pressure of a given amount of gas is directly proportional to the temperature at a given volume i.e.
[tex]P\propto T[/tex]
It means the relationship between the pressure and the temperature is direct.
If the temperature increases, the pressure of the gas also increases. Hence, the correct option is (A).
is copper an elementary substance or a compound?
0.53g of acetanilide was subjected to kjeldahl determination and the ammonia produced was collected in 50cm3 of 0.50M of h2so4.on dilution 250cm3, the acid was titrated against 25cm3 portion of 0.05M sodium carbonate solution. 13.60 of acid was required for each titration. What is percentage of nitrogen in acetanilide
Answer:
10.57% of N in acetanilide
Explanation:
All nitrogen in the sample is converted in NH₃ in the Kjeldahl determination. The NH₃ reacts with H₂SO₄ as follows:
2NH₃ + H₂SO₄ → 2NH₄⁺ + SO₄²⁻
The acid in excess in titrated with Na₂CO₃ as follows:
Na₂CO₃ + H₂SO₄ → Na₂SO₄ + H₂O + CO₂
To solve this question we must find the moles of sodium carbonate = Moles of H₂SO₄ in excess. The added moles - Moles in excess = Moles of sulfuric acid that reacts:
Moles Na₂CO₃ anf Moles H₂SO₄ in excess:
0.025L * (0.05mol / L) = 1.25x10⁻³ moles Na₂CO₃ / 0.01360L =
0.09191M * 0.250L = 0.0230 moles H₂SO₄ in excess.
Moles H₂SO₄ added:
0.050L * (0.50mol / L) = 0.0250 moles H₂SO₄ added
Moles that react:
0.0250 moles - 0.0230 moles = 0.0020 moles H₂SO₄
Moles of NH₃ = Moles N:
0.0020 moles H₂SO₄ * (2mol NH₃ / 1mol H₂SO₄) = 0.0040 moles NH₃ = Moles N
mass N and mass percent:
0.0040 moles N * (14g / mol) = 0.056gN / 0.53g * 100 =
10.57% of N in acetanilideIf peanut butter wasn't called peanut butter.. what would it be called?
Answer:
I have no idea
Explanation:
Can someone please help me with the right answer? I only have one more attempt :(
what is the mass of [tex]Fe^{2+}[/tex] in 5 tablets of iron if the number of moles of [tex]Fe^{2+}[/tex] is 4.2225 x [tex]10^{-4}[/tex] mol.
[ Ar = Fe, 56 ]
Answer:
Approximately [tex]0.11823\; \rm g[/tex] in total for the five tablets.
(Approximately [tex]2.3646 \times 10^{-2}\; \rm g[/tex] per tablet.)
Explanation:
The relative atomic mass of an element is the ratio between:
the mass of one atom of this element, and the mass of one-twelfth of a carbon-[tex]12[/tex] atom.The definition of moles ensures that the relative atomic mass of an element is approximately numerically equal to the mass (measured in grams) of one mole of the atoms of this element.
The question states that the relative atomic mass [tex]A_{\rm r}[/tex] of iron is [tex]56[/tex]. In other words, the mass of one mole of iron [tex]\rm Fe[/tex] atoms would be approximately [tex]56\; \rm g[/tex].
The question is asking for the mass of some amount of [tex]\rm Fe^{2+}[/tex] ions. Each [tex]\rm Fe^{2+}\![/tex] ion contains two fewer electrons than a neutral [tex]\rm Fe[/tex] atom. Hence, [tex]4.2225 \times 10^{4}\; \rm mol[/tex] of [tex]\rm Fe^{2+} \![/tex] ions might be lighter than the same number of [tex]\rm Fe \![/tex] atoms by a very small extent: The mass of one mole of electrons is approximately [tex]5 \times 10^{-4}\; \rm g[/tex], much smaller than the mass of the same number of [tex]\!\rm Fe[/tex] atoms (approximately [tex]56\; \rm g[/tex].)
Estimate the mass of these [tex]4.2225 \times 10^{4}\; \rm mol[/tex] of [tex]\rm Fe^{2+}[/tex] ions using the mass of the same number of [tex]\rm Fe[/tex] atoms:
[tex]\begin{aligned}&m({\rm Fe^{2+}}) \\ &\approx m({\rm Fe}) \\ &\approx 4.2225 \times 10^{-4}\; \rm mol \\ &\quad\quad \times 56\; \rm g \cdot mol^{-1} \\ &\approx 2.3646 \times 10^{-2}\; \rm g \end{aligned}[/tex].
Five of these tablets would contain approximately [tex]5 \times 2.3646 \times 10^{-2}\; \rm g \approx 0.11823\; \rm g[/tex] of [tex]\rm Fe^{2+}[/tex] ions.
the process plants use to make sugar for food
A respiration
B eqidermis tissue
C photosynothedis
D chlorophyll
Lunar Eclipse. Choose ALL that apply
Question 1 options:
Earth casts its shadow on the moon
The moon turns dark
Light from the sun is blocked
Earth is directly between the moon and sun
Question 2 (0.5 points)
Solar Eclipse: Choose ALL that apply
Question 2 options:
The Earth is directly between the moon and sun
Earth casts a shadow on the moon
Moon moves between the sun and Earth
The moon blocks out the light of the sun and casts a shadow onto the Earth
In this exercise we have to use the knowledge of lunar eclipse to identify the alternatives that correspond to this effect, as follows:
Light from the sun is blockedEarth is directly between the moon and sunWhat is lunar eclipse?A lunar eclipse happens when the Earth is between the Moon and the Sun, at times when they are aligned. Depending on the position of the Moon, it is total, partial or penumbral. Different stages of a lunar eclipse on a full moon night.
Now, use the knowledge of solar eclipse to identify the alternatives that correspond to this effect, as follows:
Moon moves between the sun and EarthThe moon blocks out the light of the sun and casts a shadow onto the EarthWhat is the definition of solar eclipse?Solar eclipse is an astronomical phenomenon that occurs when the Moon is positioned between the Earth and the Sun, hiding the light emitted by the star towards the planet.
See more about eclipse at brainly.com/question/25105283
Height
O
Genetic
O Environmental
O Both
Answer:
its both because your hight can change if u do exercises
Hope it helped.
Please help :)
It’s a science thing for 7th grade
Answer: The first question is chemical The second one is Physical
Explanation:
4. A girl walked for 30 minutes. She noticed that she traveled farther in the first 15 minutes of
her walk than in the second 15 minutes,
What can she conclude about her walk?
A she walked over many hills
B
her average speed was faster during the first part of her walk
C. she walked in two different directions
D. she was walking at a constant speed