25,963 Answered Questions for the topic chemistry

Chemistry Biochemistry

06/06/24

I need help with these problems
A series of reactions containing 20μΜ invertase with different sucrose concentrations in each areperformed and initial velocities are measured. Invertase has a kcat of 1 x 10 4. KM is measured to... more
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Chemistry Biochemistry

06/05/24

Do we find the pka’s for these?
To separate the proteins, you need to prepare 1600 mL of a 182 mM buffer at pH 7.8. You check the shelf and find the following reagents: Develop a detailed protocol for preparing this buffer. Note... more
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Chemistry Biochemistry

06/05/24

Help with solving this problems
The ratio of the two products to sucrose is 140,000 at 310K.A) Calculate delta Go for this reaction at 310K. B) If the change in standard enthalpy for this reaction is -14.4 kJ/mol, what is the... more
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Chemistry

06/04/24

Limestone stalactites and stalagmites are formed in caves by the following reaction: Ca2+(aq) + 2HCO3- ➡ CaCO3(s) + CO2 (g) + H2O (g)
If 3.45 moles of calcium carbonate form at 298K under one atmosphere pressure, What is the total volume of gaseous product produced?
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Chemistry

06/04/24

Consider the decomposition of solid calcium carbonate (limestone) to solid calcium oxide and gaseous carbon dioxide: CaCO3(s) ➡ CaO(s) + CO2(g)
A 34.50 g piece of limestone is placed into a 1.50 L container and heated until the solid completely composes. What is the final pressure in the container when the temperature of the container... more
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Chemistry

06/01/24

Identify all the intermolecular forces present in the compound H2O. hydrogen bonds dispersion forces dipole-dipole forces
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Chemistry

05/31/24

Calculate the [H+] when the pOH = 5.48
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Chemistry

05/30/24

significant figures in pH calculations
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Chemistry Biochemistry

05/29/24

Help me solve these questions!
Consider the simple reaction below: A ⇄ B + C ΔGo = -3.7 kcal/mol1. What is the K eq for this reaction under physiological conditions? 2. If a reaction is set up with 0.1μM of A,... more
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Chemistry Biochemistry

05/29/24

Help solve this!
For the reaction X + Y ⇄ Z with a Keq of 0.822A) What is the standard free energy change for this reaction at 37 degrees Celsius?B) If [X] = 10mM, [Y] = 0.21M, [Z] = 125 μM, which direction does... more
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Chemistry

05/25/24

26.1 g of Fe were placed into a container and allowed to react with 78.4 g O2. What is the theoretical yield of Fe2O3?
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Chemistry

05/23/24

Calculate theoretically, how many moles of CO2 should have been produced by using 0.0466 moles of NaHCO3 and the mole ratio of 1:2
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Chemistry

05/22/24

This question concerns net ionic equations and spectator ions.

In a reaction between aqueous solutions of AgNO3 and LiCl, identify the spectator ions and the precipitate compound in the reaction.
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Chemistry

05/22/24

This question concerns writing an equation of a base.

Sodium carbonate is an important industrial base, even though it contains no hydroxide anion. Write an equation that demonstrates the character of sodium carbonate as a base.
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Chemistry

05/22/24

My question concerns polyprotic acids.

Formulate a reasoning for the stepwise ionization and subsequent weakening of the acid for polyprotic acids.
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Chemistry

05/22/24

My question concerns polyprotic acids.
Formulate a reasoning for the stepwise ionization and subsequent weakening of the acid for polyprotic acids.
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Chemistry

05/22/24

If the butane collected in water displacement actually contained 10% propane what would happen to its calculated molar mass explained through the variables in MM=gRT/PV
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Chemistry

05/20/24

This question concerns vapor pressure lowering.

Why is the vapor pressure of an aqueous solution of calcium chloride lower than the vapor pressure of water?
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Chemistry

05/20/24

This question concerns freezing point depression.

Aqueous solutions with a molality of 0.020 m are prepared from Na3PO4, KCl, C6H12O6, and CaCl2. Determine the expected freezing point of each solution.
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Chemistry

05/20/24

This question concerns boiling point elevation.

Assume you are given 0.040 m solutions in acetic acid of KI, MgCl2, an CaSO4. Determine the expected change to the boiling point of each.
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Chemistry

05/20/24

This question concerns freezing point depression.

Predict the freezing point of a solution of 456 g ethanol and 75.0 g KCl.
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Chemistry

05/20/24

This question concerns freezing point depression.

Predict the freezing point of a solution of 155 g LiCl in 575 g water.
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Chemistry

05/20/24

This question concerns boiling point elevation.

Determine the boiling point of a solution formed by dissolving 0.4000 kg of table sugar, C12H22O11, in 1.100 L of water.
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Chemistry

05/20/24

This question concerns stoichiometry.

If 17.5 L of methane, CH4, combust completely with excess oxygen at STP, determine the volumes of each of the products form.
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Chemistry

05/20/24

This questions concerns stoichiometry and the percent yield.

The process of coal gasification is used to convert coal, which is pure carbon, into methane gas according to the following reaction: 2C(s) + 2H2O(l) yields CH4(g) + CO2(g). If the reaction has 82%... more
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