02/23/23

Thermochemistry
Calculate the non-standard cell potential (in V) for the following reaction at 110.55 ℃ with the following concentrations: [Mg^+2] = 2.00×10−72.00×10^-7 M; [Cu^+2] = 5.582 MCu^+2(aq) + Mg(s) -->... more
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02/23/23

A reaction has a rate constant of 0.364 min^-1 at 90.0 C degrees and a rate constant of 0.879 min ^-1 at 430 C degrees.
Calculate the energy of activation of this reaction in kJ/mol
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02/23/23

Write the complete nuclear equation for the bombardent of a Be9 atom with an 𝛼 particle to yield B12 . Show the atomic number and mass number for each species in the equation
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02/23/23

Science-Chemistry

What is ∆G for a reaction where ∆G° = 3.2 kJ/mol and Q = 3.3 at 295 K? (R = 8.314 J/mol ･ K)
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02/22/23

A 64 µCi sample of Tl-201 decays to 4.0 µCi in 12 days. What is the half-life, in days, of Tl-201?
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02/22/23

Convert a 4.7% mass percent (mass-to-volume percent ) solution of NaOCl (formula mass = 74.441 g/mol) to molarity. Assume the density of the solution is 1.0 g/mL.
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02/22/23

How many grams of Na2SO4 will be produced if you start with 158 grams of NaOH?

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02/22/23

How many moles of Ag are produced from 4.25 moles of Cu?
1 Cu + 2 AgNO3 →1 Cu(NO3)2 + 2 Ag
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02/22/23

Calculate the volume of oxygen gas, measured at 30.0°C and 725 torr that can be produced from complete decomposition of 3.49 grams of mercury(II) oxide.
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02/22/23

A 210.4g hydrate of Epsom Salt, MgSO4×H2O was hested ip, the water was released, abd the final anhydrate mass was 120.4 g. What is the formula of this hydrate
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02/22/23

Write the equation for the rate of reaction based on the concentration of reactants and products.

Write the equation for the rate of reaction based on the concentration of reactants and products.
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02/22/23

How much energy is required to heat the solid iron from 1535 ∘C to 2000 ∘C ?
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02/22/23

Silver chromate is sparingly soluble in aqueous solutions. The 𝐾sp of Ag2CrO4 is 1.12×10−12 .
What is the solubility (in mol/L) of silver chromate in 1.00 M silver nitrate aqueous solution?
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02/22/23

A 0.301 g piece of solid Mn reacts with gaseous oxygen to form solid magnesium oxide.a student weighs the mass of the magn. oxide collected from this reaction as 0.239 g. what is the percent yield
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02/21/23

What are the units for the rate constant of a reaction with the rate law, Rate = k[A][B]?
options;s^-1Ms^-1m^-1S^-1M^-2S^-1sM^-1
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02/21/23

[H3O+]=8×10−6M Express your answer using one decimal place.
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02/21/23

Hi, how can I express this problem as a nuclear equation?
A radioisotope emits a positron to form germanium-74.
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02/21/23

If 10.0 grams of NaCl is dissolved in 100.0 mL of water what is the concentration in weight/volume percent? What is the molarity?
If 10.0 grams of NaCl is dissolved in 100.0 mL of water what is the concentration in weight/volume percent? What is the molarity?
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02/21/23

Chemical reactions
Ammonium phosphate NH43PO4 is an important ingredient in many solid fertilizers. It can be made by reacting aqueous phosphoric acid H3PO4 with liquid ammonia. Calculate the moles of ammonia needed... more
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02/21/23

calculate the amount of heat
Calculate the amount of heat in kilocalories to melt 60.0 g of ice at 0 ℃ and warm the liquid to 65 ℃. Hfus = 80. cal/g; Hvap = 540 cal/g; SH = 1.00 cal/g
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02/21/23

What is the value of 𝐾 for this aqueous reaction at 298 K?
A+B↽−−⇀C+D Δ𝐺°=23.53 kJ/molK=?
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02/21/23

Consider these two cases. Case 1: An electron jumps from energy level 3 to energy level 5 in an atom. Case 2: An electron jumps from energy level 3 to energy level 7 in an atom.
For case 1, what happens when an electron jumps from energy level 3 to energy level 5 in an atom? A proton is emitted by the atom. A photon is emitted by the atom. A proton is absorbed by... more
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02/21/23

When an electron in a hydrogen atom is in the 𝑛=3 state, is it on average closer to, farther from, or the same distance to the nucleus than in the ground state?
When an electron in a hydrogen atom is in the 𝑛=3 state, is it on average closer to, farther from, or the same distance to the nucleus than in the ground state? the same farther closer Does it... more
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02/21/23

For a hydrogen‑like atom, classify the electron transitions according to whether they result in the absorption or emission of light.
Answer bank: Sort into two columns - Absorption and emissionn=3 to n=5, n=2 to n=1, n=1 to n=3, n=3 to n=2Ignoring sign, which transition is associated with the greatest energy change?n=3 to n=2,... more
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02/21/23

Microwave ovens emit microwave energy with a wavelength of 12.9 cm. What is the energy of exactly one photon of this microwave radiation?
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