06/05/19

How much energy (in J) is lost when a sample of iron with a mass of 25.3 g cools from 70.0 ∘C to 29.0 ∘C?
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05/31/19

How do I write a procedure for creating a buffer?
I need to write an original procedure with exact numbers for creating a buffer:Create a buffer using and that has a pH of exactly 3.75.A 50 mL sample of your buffered solution will have to be able... more
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05/31/19

Question looking for hydroxide ion concentration?
The [OH-] concentration of a solution of 3.41 mol/L sodium carbonate is? a.bcd? mol/L
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05/31/19

Chemistry Reactions and Formulas

Part A. Tell whether the reaction will occur or not and why Part B. Write the balanced equation for those that will occur. Write the formulas of the reactants for those reactions that do not occur.... more
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05/31/19

Chemistry question

A solution is made by adding 1.23 mol of KCl to 1000.0 g of water. Assume that the density of water (and the resulting solution) is 1.00 g/mL.a. Calculate the formula weight of KCl.b. Calculate the... more
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05/31/19

Chemistry question

A 250. gram sample of ice has a temperature -20.0˚C. Give all answers in kilojoules.a. Calculate the energy required to heat the ice to 0.0˚C.b. Calculate the energy required to melt the ice.c.... more
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05/31/19

Chemistry question

A container holds 22.4 L of gas at 1.00 atm and 0.0˚C.a. Convert 0.0˚C to Kelvin.b. State the combined gas law.c. If the pressure increases to 1.50 atm and the temperature doesn’t change, calculate... more
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05/30/19

Chemistry Help with reactions
A. Tell whether the reaction will occur or not and why B. Write the balanced equation for those that will occur. Write the formulas of the reactants for those reactions that do not occur. C.... more
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05/30/19

Chemistry Question
What would the combined mass (in grams) be of the following samples? 0.48 mol barium phosphate, 58.7 L of bromine gas (at STP) and 3.58x10^21 molecules of SCl2
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05/30/19

the Ka for sulfurous acid is?

The pH of a 0.401 mol/L solution of sulfurous acid is 1.16 (used as an example, your value may be different). Based on this evidence, the Ka for sulfurous acid is a.bcd?
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05/30/19

The [H3O+] in a solution of 0.18 methanoic acid?

The [H3O+] in a solution of 0.18 methanoic acid is a.bcdef? mol/L
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05/30/19

Chemistry reaction

If 10.0 g of hydrogen and 75.0 g of oxygen are exploded together in a reaction tube, how much water is projected? What other gas is found in the reaction tube (besides water vapor) after the... more
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05/30/19

Chemistry converting to moles
Calculate the total number of miles in the following mixture of elements: 54.0 g aluminum sulfide, 6.022x10^24 atoms gallium and 74.2 mL of nitrogen gas (assume at STP)
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05/29/19

For the reaction of hypochlorous acid and sodium acetate, are the products or reactants favored?
For the reaction of hypochlorous acid and sodium acetate, are the products or reactants favored?Question 6 options: a. Reactants b. Products
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05/28/19

Calculate the number of cholesterol (C27H46O) molecules in a 3.2mg cholesterol deposit in an artery
Calculate the number of cholesterol (C27H46O) molecules in a 3.2mg cholesterol deposit in an artery.
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05/28/19

How many grams of calcium hydroxide are needed to completely react with 25.0 mL of 0.100 M nitric acid?
please help i dont understand
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05/27/19

For the reaction of ammonia with hypochlorous acid, are the products or reactants favored?
For the reaction of ammonia with hypochlorous acid, are the products or reactants favored.Question 5 options: a. Products b. Reactants
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05/27/19

Volume to mL story problem

Diethyl Disulfide has a density of 0.993 g/mL at 20.0 Celsius. If a 166 gram sample of this compound is needed, what volume of the liquid at 20.0 Celsius must be provided?Volume= ? mL
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05/24/19

Which enzymes degrade dynorphins and what drugs inhibit these enzymes?
Which enzymes degrade dynorphins and what drugs are there available to inhibit said enzymes?
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05/23/19

Chemistry Volume
A black olive containing its seed has a mass of 4.5 g and a volume of 4.3 cm (cubed). Will the olive sink or float on the water?
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05/23/19

Chemistry Problem
Earth is approximately 1.5 x 10^8 km from the sun. How many minutes does it take light to travel from the sun to Earth? The speed of light is 3.0 x 10^8 m/s
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05/23/19

Chemistry Question
A helium balloon and a balloon filled with carbon dioxide are punctured with holes of the same size. At what speed does the helium effuse if the carbon dioxide effuses at a speed of 410. m/s?
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05/23/19

Chemistry Question
There are two forms of gold chloride. What is the formula for the form of gold chloride that contains 65% gold and 35% chlorine? What would the formula be for the other form of gold?
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05/23/19

Chemistry. Are all radicals ions? Please answer me quick. Is CI- an ion or radical
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05/23/19

Create a buffer using CH3COOH and NaCH3COO that has a pH of exactly 3.75.?
a 50 mL sample of your buffered solution will have to be able to withstand the addition of 25.0 mL of 0.100 M NaOH solution. the buffered solution will break after the addition of no more than 35.0... more
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