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Chemistry

Eduardo Crosby

If 95.2 grams of C4H9N were reacted with 446 grams of O2 how many grams of CO2 would be produced

4C4H9N + 29O2 = 16CO2 + 18 H2O + 4NO2

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Chemistry

Andreas

Which of the following is unchanged when a solution is diluted by the addition of solvent?

a. volume of solvent

b. mass of solvent

c. number of moles of solute

d. molarity of solution

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Chemistry

Brenda Santana

A sample of hydrogen (H2) gas is collected over water at 35oC and 725 mm. The volume of the gas collected is 72.0 ml. How many moles of H2 gas has been collected? How many grams of H2 gas has been collected?

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Chemistry

Harry

if the automatic number of an element is 6 and it's mass number is 14 how many neutrons are contained in the nucleus

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Chemistry

Martin Gibbs

What is the main factor that determines if a star will become a black hole

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Chemistry

Shannon Becker

Which of the following is not a rock? a. granite b. shale c. marble d. diamond

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Chemistry

Roselyn Skinner

Donna is attempting to make an electromagnet to pick up old nails in and around her driveway. Which of these materials would be best to use for the core in order to make the strongest electromagnet to pick up the most nails? A) water B) iron nail C) wooden stake D) plastic tube

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Chemistry

Guest

The amount of silica in the magma and temperature are factors that determine the viscosity of magma.

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Chemistry

Sloan

Valeric acid, an organic acid, contains only C, H, and O. If 0.471 g of the acid burns completely in O2 it gives 1.01 g CO2 and 0.415 g H2O. Determine the empirical formula of the acid.

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Chemistry

Murphy

Ab2 has a molar solubility of 3.72*10-4 m. what is the value of the solubility product constant for ab2? express your answer numerically.

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Chemistry

Jasmine Beltran

How much water must be added when 125 mL of a 2.00 M solution of HCl is diluted to a final concentration of 0.400M?

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Chemistry

Brooklynn Fitzgerald

The nursing student is studying drug dosing with liquids. The student knows that a specific amount of drug will be in a given volume. A particular drug label reads "Augmentin 125 mg/5 mL." Which is the correct volume?

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Chemistry

Kylan Cox

3. Five grams of orange-drink mix are

dissolved in 100 grams of water. What

would you expect the mixture to weigh?

A) 95 grams

B) 100 grams

C) 105 grams

D) 500 grams

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Chemistry

Nigel Peterson

What is the formula for the aqueous salt produced when hydrofluoric acid is neutralized by sodium hydroxide?

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Chemistry

Reid Lawrence

Which statement is a reason to support population regulation?

A) It is unethical for us to control birth control rates

B) Humans have the freedom to produce as many children as desired

C) The gap between the rich and poor has been narrowing since 1960

D) Billions more people on the Earth will intensify many environmental and social problems

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