Answer: Red supergiant.
Explanation:
The stars in group C are even more luminous than the giants. These are super giants, the largest of stars with extremely high luminosisties. A red supergiant such as Betelguese would extend beyond the orbit.
What is ostwald process?? Give the first catalytic reaction of this process. .
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Answer: Smelling salts and oxygen are introduced into a metal catalyst-containing tube (platinum). Typically warmed to get the reaction started. The alkali is then oxidized to produce nitric oxide.
Answer:
The Ostwald process is a chemical process used for making nitric acid. Wilhelm Ostwald developed the process, and he patented it in 1902. The Ostwald process is a mainstay of the modern chemical industry, and it provides the main raw material for the most common type of fertilizer production
Explanation:
The first stage of the Ostwald process involves the catalytic oxidation of ammonia into nitric oxide, using platinum as the catalyst. The nitric oxide is then transferred to a different oxidizing tower, where it is oxidized into nitrogen dioxide
What is the mass of 3.011 x 1023 atoms of Ca ?
Answer:
2g is the answer
Explanation:
based on google
Which of the following correctly describes what happens to the kinetic energy of water when it changes from the liquic
state to the solid state?
• There is no change in the kinetic energy of the molecules.
O The kinetic of energy of the molecules increases.
• The kinetic energy of the molecules increases then decreases.
of O The kinetic energy of the molecules decreases.
Answer:
The kinetic energy decreases
Explanation:
When water freezes, it is losing heat. Heat and energy are interchangeable, meaning it loses energy.
Answer:
The kinetic energy of the molecules decreases.
Explanation:
because when temperature decreases the average kinetic energy of the gas molecules decreases as well.
A molecule that is either cycloheptane or cycloheptene is treated with bromine and the sample immediately absorbs the red bromine color—which compound is present?
Since the molecule is able to immediately absorb the red color of the bromine, the molecule would be cycloheptene.
What is unsaturation?Unsaturation in organic compounds refers to the presence of double or triple bonds in the compounds.
One way to test for unsaturation is to use bromine water. A saturated compound will not be able to absorb bromine because it is already saturated.
An unsaturated compound, on the other hand, will be able to absorb bromine due to the unsaturation. Therefore, the red color of bromine will disappear due to absorption.
Cycloheptane is saturated while cycloheptene is unsaturated. Thus, the latter will absorb the red color of bromine.
More on unsaturation can be found here: https://brainly.com/question/561845
What must happen for a nuclear reactor to make electricity
Answer:
They contain and control nuclear chain reactions that produce heat through a physical process called fission. That heat is used to make steam that spins a turbine to create electricity
Explanation:
what type of critial thinking is important in agriscience
Answer:
Explanation:
Observation. Observational skills are the starting point for critical thinking. People who are observant can quickly sense and identify a new problem.
Analysis. Once a problem has been identified, analysis skills become essential. ...
Determine the mass of the following samples
3 moles of Mg
4.2 moles of NaCI
Answer:
See below
Explanation:
From periodic chart
Mg = 24.305 gm per mole
24.305 * 3 = 72.915 gm
Na = 22.989
Cl = 35.45 summed = 58.439 gm per mole
58.439 * 4.2 = 245.4438 gm
Many aerosol cans have warning labels on the side
that say to keep away from heat and fire. Why?
Answer:
Aerosol cans are pressurized, High temperatures increase the pressure in an aerosol can, potentially to the point of explosion.
Which of the following will oxygen react with to cause combustion?
O A. A hydrocarbon
O B. Heat
O C. Carbon dioxide
O D. Water
HELP
Answer:
hydrocarbon
Explanation:
it reacts with oxygen to produce water and carbon dioxide.
hope this helps.
A 0.563 M solution of the salt NaA has a pH of 11.56. Calculate the Ka value for the acid HA. Record your answer in scientific notation to 3 sig figs.
Answer:
[tex]\displaystyle K_a = 4.24\times 10^{-10}[/tex]
Explanation:
Write the base reaction of NaA with water:
[tex]\displaystyle \text{A}^-_\text{(aq)}+\text{H$_2$O}_\text{($\ell$)}\rightleftharpoons \text{HA}_\text{(aq)} + \text{OH}^-_\text{(aq)}[/tex]
Hence, the equilibrium constant expression for the reaction is:
[tex]\displaystyle K_b = \frac{[\text{OH}^-][\text{HA}]}{[\text{A}^-]}[/tex]
Thus, to find Ka, we can find Kb and use the fact that Ka × Kb = Kw.
From the reaction and initial concentration of NaA, create an ICE chart:
[tex]\begin{tabular}{llllll} & A^- &\text{H$_2$O} & \rightleftharpoons & HA & OH^- \\I & 0.563 M & \---- & & 0 M & 0 M \\C & -\text{ $ x$} & \---- & & +\text{ $x$ M} & + \text{$x$ M} \\E & \text{(0.563 - $x$) M} & \---- & & \text{$x$ M} & \text{$x$ M} \end{tabular}[/tex]
Find [OH⁻] from the given pH:
[tex]\displaystyle \begin{aligned} \text{pH} +\text{pOH} & = 14.00 \\ \\ \text{pOH} & = 14.00 - \text{pH} \\ \\ & = 14.00 - (11.56) \\ \\ & = 2.44 \\ \\ -\log[\text{OH}^-] & = 2.44 \\ \\ [\text{OH}^-] &= 10^{-2.44} \\ \\ & =0.00363 \text{ M}= 3.63\times 10^{-3} \text{ M} = x\text{ M}\end{aligned}[/tex]
Solve for all species concentrations at equilibrium from the found x value:
[tex]\displaystyle [\text{HA}] = [\text{OH}^-] = 3.63\times 10^{-3} \text{ M}[/tex]
And:
[tex]\displaystyle \begin{aligned} \ [\text{A}^-] & = 0.563 - 3.63\times 10^{-3} \text{ M}\\ \\ & = 0.559\text{ M}\end{aligned}[/tex]
Find Kb:
[tex]\displaystyle \begin{aligned} \displaystyle K_b &= \frac{[\text{OH}^-][\text{HA}]}{[\text{A}^-]} \\ \\ & = \frac{(3.63\times 10^{-3})(3.63\times 10^{-3})}{(0.559)}\\ \\ & = 2.36\times 10^{-5}\end{aligned}[/tex]
Find Ka:
[tex]\displaystyle \begin{aligned} K_a\cdot K_b & = K_w \\ \\ K_a & = \frac{K_w}{K_b} \\ \\ & = \frac{(1.00 \times 10^{-14})}{(2.36\times 10^{-5})} \\ \\ &= 4.24\times 10^{-10} \end{aligned}[/tex]
In conclusion:
[tex]\displaystyle K_a = 4.24\times 10^{-10}[/tex]
Why is the r.a.m. value used?
A. The r.a.m. value is used to determine how many isotopes an element has.
B. None of these
C. Atoms are too small for their masses to be measured directly.
D. A single atom cannot be isolated, so only the average size of a group of atoms can be measured.
Answer:
I think the answer is going to be d A single atom cannot be isolated, so only the average size of a group of atoms can be measured. :)
Have an amazing day!!
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Answer: A. The r.a.m. value is used to determine how many isotopes an element has.
Explanation: Founders Educere Answer
I love you fellow summer school students, good luck.
Please rate and mark brainliest!!
Moles to mass
HELP PLEASE
15 pts
Explanation:
nose amigo, la verdad yo también tengo dificultades escolares muchísimas gracias, Dios te bendiga en otro idioma por cierto mi anime favorito es cowboy beboop
If 10.0 moles of O₂ are reacted with excess NO in the reaction below, and only 8.0 mol of NO₂ were collected, then what is the percent yield for the reaction?
2 NO (g) + O₂ (g) → 2 NO₂ (g)
Answer:
Explanation:
General Remarks
The balance numbers are the same. (The balance numbers are 2 and 2)
The balance number in front of the O2 is 1.
So for every mole of O2 needed 2 moles of NO2 should be produced.
If 10.0 moles of oxygen is used, then you should get 20 mols of NO2 should be produced.
Formula
% yield = (what was produced / what should have been produced) *100
Givens
What was produced = 7 moles
What should have been produced = 20 moles
Solution
Substitute the givens into the equation
% yield = 8/20 * 100
% yield = 0.40 * 100
Answer: 40%
13. Subtract 0.291 from 0.4
Answer:
0.109
Explanation:
0.4-0.291=0.109
Which is stronger, the C=O bond in an ester (1735 cm–1) or the C=O bond in a saturated ketone (1715 cm–1)? Explain
25.88 grams of tin (ll) phosphate reacts with 31.73 grams of zinc.
a write a balanced chemical equation
b. what is the limiting reactant?
c. What is the excess reactant and how many moles of it are left over?
d. How many grams of of the products are produced? (2 answers)
Explanation:
Zn + Sn3(PO4)4 = Zn3(PO4)2 + Sn - Balanced Chemical Equation
4.3 is limiting
is the answer
if you like my answer please like comment and mark me as brilliant
Calculate the pH of solution
that has
[H+]of 8.1 x10^-4
Answer:
Explanation:
Calculate the pH of solution
that has
[H+]of 8.1 x10^-4
What is the effect of pressure on the volume of a gas? *answers*
(Reflect on the laboratory experiment)
Answer:
The Relationship between Pressure and Volume: Boyle's Law
As the pressure on a gas increases, the volume of the gas decreases because the gas particles are forced closer together. Conversely, as the pressure on a gas decreases, the gas volume increases because the gas particles can now move farther apart
Which statement best summarizes the way the sun produces energy?
A. Combustion reactions in the sun release large amounts of chemical energy.
B. Fusion reactions in the sun release large amounts of chemical energy.
C. Combustion reactions in the sun convert small amounts of matter into large amounts of energy.
D. Fusion reactions in the sun convert small amounts of matter into large amounts of energy.
Answer: D. Fusion reactions in the sun convert small amounts of mayter into large amounts of energy.
Will a precipitate form if you mix 75.0 mL of a NaOH solution with pOH of 2.58 if it is mixed with 125.0 mL of a 0.0018 M MgCl2 solution
A precipiatate of mass 0.013 g is formed when you mix 75.0 mL of a NaOH solution with pOH of 2.58 and 125.0 mL of a 0.0018 M MgCl2 solution
What is stoichiometry?In stoichiometry, calculations are made based on mass - mole or mole - volume relationships. First we must put down the balanced reaction equation; 2NaOH(aq) + MgCl2(aq) -----> Mg(OH)2(s) + 2NaCl(aq)
Now Ionically;
2OH^-(aq) + Mg^2+(aq) -----> Mg(OH)2(s)
Concentration of OH^- = Antilog (-2.58) = 2.6 * 10^-3 M
Number of moles of OH^- = 2.6 * 10^-3 M * 75/1000 = 0.000195 moles
Concentration of Mg^2+ = 0.0018 M
Number of moles of Mg^2+ =0.0018 M * 125/1000 = 0.000225 moles
Since;
1 mole of Mg^2+ reacts with 2 moles of OH^-
x moles of Mg^2+ reacts with 0.000195 moles of OH^-
x = 0.0000975 moles
Mg^2+ is the limiting reactant.
1 mole of Mg^2+ yields 1 mole of the precipitate
0.000225 moles of Mg^2+ yields 0.000225 moles of precipitate.
Hence, a precipitate is formed.
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what is kept constant is constant boyles law
Answer:
temperature, or true. I don't know which you want.
Explanation:
hope this helps
N2+3H2 → 2NH3
A) How many grams of NH3 can be produced from the reaction of 28g of N2 and 25g of H2?
I need the steps to the answer 34g
B) How much of the excess reagent is left over?
I need steps to the answer 19 g
Explanation:
N2 (g) + H2 (g) gives out NH3 (g)
Now balance it. You have two reactants with compositions involving a single element, which makes it very easy to keep track of how much is on each side. I would balance the nitrogens, and then the hydrogens.
Now balance it. You have two reactants with compositions involving a single element, which makes it very easy to keep track of how much is on each side. I would balance the nitrogens, and then the hydrogens.(If you balance the hydrogen reactant with a whole number first, I can guarantee you that you will have to give NH3 a new stoichiometric coefficient.)
N2 (g) + 3H2 (g) gives out 2NH3 (g)
The stoichiometric coefficients tell you that if we can somehow treat every component in the reaction as the same (like on a per-mol basis, hinthint), then one "[molar] equivalent" of nitrogen yields two [molar] equivalents of ammonia.
Luckily, one mol of anything is equal in quantity to one mol of anything else because the comparison is made in the units of mols.
So what do we do? Convert to
mols (remember the hint?).
28g N2 × 1 mol N2/ 2 × 14.007) g N2
= 0.9995 mol N2
At this point you don't even need to calculate the number of mols of H2 . Why? Because H2 is about 2 g/mol, which means we have over 10 mols of H2. We have 1 mol N2, and we need three times as many mols of H2 as we have
N2.
After doing the actual calculation you should realize that we have about 4 times as much H2 as we need. Therefore the limiting reagent is clearly N2.
Thus, we should yield 2×0.9995=1.9990 mols of NH3 (refer back to the reaction). So this is the second and last calculation we need to do:
1.9990 mol NH3 × 17.0307 g NH3/ 1 mol NH3
= 34.0444 g NH3
Hope it helpz~
34grams of NH₃ can be produced from the reaction of 28g of N₂ and 25g of H₂ and 19g of the excess reagent is left over.
What is Mole?The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.
A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.
Given,
Mass of N₂ = 28g
Mass of H₂ = 25g
Moles of N₂ = mass / molar mass
= 28 / 28
= 1 mole
Moles of H₂ = 25 / 2
= 12.5 moles
Since the number of moles of N₂ is lesser, the amount of products formed depends on the moles of N₂.
From the reaction,
1 mole of N₂ gives 2 moles of NH₃
So, Mass of NH₃ in 2 moles = 2 × 17
= 34g
B) From the reaction,
1 mole of N₂ reacts with 3 moles of H₂.
The number of Moles of H₂ left = 12.5 - 3
= 9.5 moles
Mass of excess reagent left = moles left × molar mass of H₂
= 9.5 × 2
= 19g
Therefore, 34grams of NH₃ can be produced from the reaction of 28g of N₂ and 25g of H₂ and 19g of the excess reagent is left over.
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what is the net ionic equation for the reaction that occurs when magnesium carbonate (s) and excess hydroiodic acid are combined
Answer:
2H+(aq) + 2Br-(aq) + Mg2+(aq) + S2–(aq) = Mg2+(aq) + 2Br-(aq) + H+(aq) + HS-(aq)
How many grams of acid will be neutralized by a Maalox antacid tablet that contains 0.350 g of CaCO3
The mass of the acid produced is 0.252 g from the information in the question.
What is neutralization?The term neutralization refers to the reaction between an acid and a base that yileds salt and water only.
The equation of this reaction is; 2HCl + CaCO3 ----->CaCl2 + CO2 + H2O
Number of moles of CaCO3 = 0.350 g/100 g = 0.0035 moles
Since 2 moles of acid reacts with 1 mole of CaCO3
x moles acid reacts with 0.0035 moles of CaCO3
x = 0.007 moles
Mass of acid = 0.007 moles * 36 g/mol = 0.252 g
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what conditions does bacteria need to grow in yogurt?
how do x rays use electromagnetic waves?
Answer:
X-rays are a form of electromagnetic radiation, similar to visible light. Unlike light, however, x-rays have higher energy and can pass through most objects, including the body. Medical x-rays are used to generate images of tissues and structures inside the body.
Explanation:
One way to identify the type of radioactive decay produced in a reaction is to pass the emission through an electric field. Describe the type of radioactive emission produced from the decay of uranium-
238 to thorium-234 and its reaction to the electric field
Decay of Uranium-238 produces gamma radiaton whereas decay of thorium-234 releases beta radiation.
What type of radiation is produced?In the decay of U-238, two gamma rays of different energies are emitted in addition to the alpha particle while on the other hand, in the decay of thorium-234 , beta rays are emitted.
So we can conclude that decay of Uranium-238 produces gamma radiaton whereas decay of thorium-234 releases beta radiation.
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HELP ME OUT PLS!!!!!!!!!!!!!
I. Car metal rusting slowly for a year.
II. Condensation of water vapor on a mirror during a 5-minute shower.
III. The formation of a precipitate in a test tube during a 10-second reaction.
IV. The oxidation of copper on the Statue of Liberty for more than 100 years.
23) Which of the processes above are examples of a chemical reaction?
A) I and II
B) III and IV
C) I, II, and III
D) I, III, and IV
Answer:
d) I, III, and IV
Explanation:
rust, copper oxidation, and percipitate from a chemical reaction are all, well, chemical reactions.
The first ionization energy of mercury is 1006 kJ/mol. The energy change for the reaction Hg(l) →Hg+(g) + e– is therefore
For the first ionization energy of mercury is 1006 kJ/mol. The energy change for the reaction is mathematically given as
dH = 1006KJ/mol
What is the energy change for the reaction?The amount of energy required to remove an electron from a neutral atom is called ionization energy. from the question, the electron is removed from the neutral atom Hg to give the first ionization energy
Hg→Hg +e
therefore the energy change for the reaction is
dH = 1006KJ/mol
In conclusion, the energy change for the reaction is
dH = 1006KJ/mol
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Which fossil fuel is a solid?
O oil
coal
O natural gas
Answer:
Coal
Explanation:
