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Chemistry

When balancing a chemical equation, the number of h atoms in 2 ch4 is eight?

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Chemistry

What would be the total mass of the products of a reaction in which 25 grams of table salt decomposes into the elements sodium and chlorine?

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Chemistry

The nucleus of a Helium atom has a charge equal to twice the proton's charge. Let FN denote the magnitude of the force the Helium nucleus exerts on one of the electrons in a Helium atom, and let Fe denote the magnitude of the force one electron in the Helium atom exerts on the Helium nucleus.

A. FN < Fe

B. FN = Fe

C. FN > Fe

Choose (A), (B), or (C) and defend your answer.

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Chemistry

What can you say about the past four decades?

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Chemistry

Calculate the percent yield for the reaction above if 25.0 grams of

H2SO4 was actually produced and the theoretical yield was predicted to be 42.0 grams. (% yield = Actual / theoretical x 100)

SO3 (g) + H200 H2SO4 (9)

O 59.5

O 168

O 0.595

O 1.68

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Chemistry

Why does hot water freeze faster than cold water?

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Chemistry

Anyone wanna talk dirty with me

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Chemistry

Ludwig Boltzmann developed a model that relates entropy to: Select the correct answer below:

a. the spontaneous heat flow accompanying a process to the temperature at which the process takes place

b. the number of possible configurations of the locations and energies of the atoms or molecules that comprise a system

c. the spontaneous heat flow accompanying a process to the work done on a system in which the process takes place

d. the number of, sizes, and possible configurations of the locations of the atoms or molecules that comprise a system

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Chemistry

Calculate the work associated with the compression of a gas from 121.0 l to 80.0 l at a constant pressure of 16.7 atm.

a. 685 l atm

b. - 685 l atm

c. 2.46 l atm

d. - 2.46 l atm

e. 101 l atm

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Chemistry

How do find the volume of 60.0g of ether if the density is. 70g/mL?

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Chemistry

Did the test solution react with the supernatant from the test tube that had the largest amount of precipitate? what can you infer about the molar ratio of this reaction?

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Chemistry

Contrast mixtures with pure substances

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Chemistry

A standard cell potential of which value describes a spontaneous redox reaction?

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Chemistry

Using the combined gas law, if the volume of a gas at 155kPa changes from 22L to 10L. What is the new pressure if the temperature remains constant?

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Liliana Velazquez

Chemistry

What is a contributor of global warming?

a. aerosol sprays

b. carbon dioxide

c. acid rain

d. garbage

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