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Homework Help for Chemistry (page 2)

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Chemistry

what is the root-mean-square velocity of methane molecules at 60 degrees Celsius?

Answered
24 Oct
Chemistry

An aluminum cup contains 225 g of water and a 40-g copper stirrer, all at 27°C. A 400-g sample of silver at an initial temperature of 87°C is placed in the water. The stirrer is used to stir the mixture until it reaches its final equilibrium temperature of 32°C. Calculate the mass of the aluminum cup.

Answered
21 Oct
Chemistry

In one cycle, a heat engine absorbs 500 J from a high-temperature reservoir and expels 300 J to a low-temperature reservoir. If the efficiency of the engine is 60% of the efficiency of the Carnot engine, what is the ratio of the low temperature to the high temperature in the Carnot engine?

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27 Oct
Chemistry

For a hydrogen atom in its ground state, use the Bohr model to compute (a) the orbital speed of the electron, (b) the kinetic energy of the electron, and (c) the electrical potential energy of the atom.

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21 Oct
Chemistry

What is the mass of a helium atom?

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20 Oct
Chemistry

Which of the following electronic configurations are not allowed for an atom? Choose all the correct answers. (a) 2s22p6 (b) 3s23p7 (c) 3d74s2 (d) 3d104s2 4p6 (e) 1s2 2s22d1 ?

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19 Oct
Chemistry

How do you write the electron configuration for carbon?

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17 Oct
Chemistry

The planetary model of the atom pictures electrons orbiting the atomic nucleus much as planets orbit the Sun. In this model, you can view hydrogen, the simplest atom, as having a single electron in a circular orbit in diameter. (a) If the average speed of the electron in this orbit is known to be , calculate the number of revolutions per second it makes about the nucleus. (b) What is the electron's average velocity?

Answered
28 Oct
Chemistry

When the principal quantum number is n=5, how many different values of (a) l and (b) m1 are possible? (c) How many states have distinct pairs of values of l and m1?

Answered
21 Oct
Chemistry

What is the electron configuration of carbon?

Answered
25 Oct
Chemistry

Are cis and trans isomers diastereomers?

Answered
25 Oct
Chemistry

The two major isotopes of uranium are (235.0409 amu) and (238.0508 amu). Given that the natural abundances of and  are about 0.72% and 99.28%, respectively, what is the molar mass (atomic weight) of uranium?

Answered
28 Oct
Chemistry

What is a hybrid orbital set?

Answered
25 Oct
Chemistry

What is the mass percent of each element in aspirin, ?

Answered
25 Oct
Chemistry

which best describes this reaction between magnesium and oxygen?

Answered
25 Oct
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