05/13/23

if you decrease the temperature, what will happen?
In an endothermic reaction at equilibrium, if you decrease the temperature, what will happen? Question 4 options: A. the amount of reactant and product will stay the same B. more product will be... more
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05/12/23

what mass of H2O can be produced?
Given the equation below, 12.35 grams of H2SO4, and excess Ca(OH)2, what mass of H2O can be produced? Round your answer to two digits after the decimal point.H2SO4 + Ca(OH)2 à 2 H2O + CaSO4
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05/11/23

Chemistry Molarity question (In description due to unable to type in the title)

What volume of 4.2 M Ca(OH)2 is needed to make 500mL of 1.5M solution
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05/11/23

For each of the scenarios, identify the order with respect to the reactant, A. A⟶products
For each of the scenarios, identify the order with respect to the reactant, A. A⟶productsA three‑fold increase in the initial concentration of A leads to a 1.73‑fold increase in the initial... more
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05/11/23

A particular reactant decomposes with a half‑life of 137s when its initial concentration is 0.289 M. The same reactant decomposes with a half‑life of 233s when its initial concentration is 0.170 M.
A particular reactant decomposes with a half‑life of 137s when its initial concentration is 0.289 M. The same reactant decomposes with a half‑life of 233s when its initial concentration is 0.170... more
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05/10/23

20 grams NaCl are dissolved in water to make a 0.85 M solution. What is the volume of the solution in mL
Need help on a homework assigment
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05/09/23

Calculate the pH and concentrations of CH3NH2 and CH3NH3+
Calculate the pH and concentrations of CH3NH2 and CH3NH3+ in a 0.0447 M methylamine (CH3NH2)  solution. The 𝐾b of CH3NH2 is 4.47×10−4.pH=[CH3NH2]= M[CH3NH3+]=
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05/09/23

Calculate the 𝐾a for the acid
Enough of a monoprotic acid is dissolved in water to produce a 0.0114 M solution. The pH of the resulting solution is 2.66. Calculate the 𝐾a for the acid.𝐾a=
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05/08/23

When 46.0g of sodium hydroxide reacts with an excess of aluminum sulfate, how many grams of aluminum hydroxide are formed, according to the reaction below?
When 46.0g of sodium hydroxide reacts with an excess of aluminum sulfate, how many grams of aluminum hydroxide are formed, according to the reaction below? Al2(SO4)3(aq) + NaOH(aq) →... more
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05/08/23

Chemistry related

An sp hybridized central atom can be used to describe the bonding in(A) CH4(B) HCN(C) H2CO(D)OF2Could you explain which answer you got and explain why?
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05/08/23

Wavelength and Frequency : General Chemistry
Visible light has wavelengths from 400 to 700 nm, whereas the wavelength region for gamma ray radiation is 1.0×10-16 to 1.0×10-11 m.We can say that:1. The frequency of visible light is _____ gamma... more
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05/08/23

At what temperature (K) will a 3.32 g sample of neon gas exert a pressure of 398 torr in a 4.99 L container?
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05/05/23

Does Hess' law always require canceling out all parts of equation to get the delta H of the reaction?
Does Hess' law always require canceling out all parts of equation to get the delta H of the reaction?What am I doing wrong on this Hess' Law problem?Question: What is the delta H of the reaction... more
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05/05/23

Titrations and Buffers
What is the pH of a 1.0 L buffer made with 0.300 mol of HF (Ka = 6.8 × 10⁻⁴) and 0.200 mol of NaF to which 0.100 mol of HCl were added?
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05/05/23

Acids and Bases
A. What information does an acid or base equilibrium constant give?B. What is the acid dissociation constant for an acid at equilibrium, HX = H* + X-? C. What is the base dissociation constant for... more
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05/05/23

Equilibrium and kinetics

A. What information does the equilibrium constant give? B. What is the equilibrium constant of aA+bB = cC +dD? C. What does Le Châtelier's principle predict will happen to a system if equilibrium... more
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05/04/23

Calculate the pH of a Solution at Each Temperature

Calculate the pH of a 0.0242 M KOH solution at each temperature.T (°C)KwAt 5°C _ Kw = 1.88 x 10–15At 45°C _ Kw = 3.94 x 10–145°C pH=45°C pH=
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05/04/23

Calculate the pH of the solution and the concentrations

The 𝐾a of propanoic acid (C2H5COOH) is 1.34×10−5. Calculate the pH of the solution and the concentrations of C2H5COOH and C2H5COO− in a 0.249 M propanoic acid solution at equilibrium.pH=[C2H5COOH]=... more
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05/04/23

If a 0.570 𝑚 aqueous solution freezes at −2.00 ∘C, what is the van't Hoff factor, 𝑖, of the solute?
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05/03/23

Iron-56, ⁵⁶₂₆Fe, has a binding energy per nucleon of 8.79 MeV. (1 MeV = 1.60 × 10⁻¹³ J).
Determine the amount of energy, in J, needed to 'decompose' 1 mol of iron-56 nuclei into the individual nucleons.
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05/03/23

A proton is accelerated to 79.2 MeV per particle. What is this energy in kJ/mol?
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05/03/23

What is the mole fraction of I2 in a solution made by dissolving 63.1 g of I2 in 245 g of hexane, C6H14?
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05/03/23

Chemistry Lab using Hcl and Sodium Bicarbonate to recreate a airbag
I have a 1.12L ziplock bag. I have to combine the proper amount of HCl and NaHCO3 in the bag for a lab to fill the bag enough so that it is plump but will not pop. The temperature of the room will... more
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05/03/23

Chemistry with Solutions and mixtures
A 25.0 mL solution of HBr is neutralized with 16.6 mL of 0.105 M Sr(OH)₂. What is the concentration of the original HBr solution?
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05/02/23

Henry's Law Question
The solubility of carbon dioxide in water is very low in air (1.05 x 10^-5) because the partial pressure of carbon dioxide in air is only 0.00030 atm. What partial pressure of carbon dioxide is... more
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