Chemistry » Page 68

Chemistry

Byron

How much fencing material does fiona need in meters?

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Chemistry

Evelyn Frey

Write the full ground-state electron configuration for each element. (a) s:

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Chemistry

Kendall Bass

What does it mean when a glass sweats

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Chemistry

Lilianna Underwood

The vapor pressure of pure benzene is 750.0 torr and the vapor pressure of toluene is 300.0 torr at a certain temperature. You make a solution by pouring "some" benzene with "some" toluene. You then place this solution in a closed container and wait for the vapor to come into equilibrium with the solution. Next, you condense the vapor. You put this liquid (the condensed vapor) in a closed container and wait for the vapor to come into equilibrium with the solution. You then condense this vapor and find the mole fraction of benzene in this vapor to be 0.669. Determine the mole fraction of benzene in the original solution, assuming the solution behaves ideally. Mole fraction =

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Chemistry

Sage Bradford

Casey remembers that molecular motion increases as temperature increases. Identify what effect increased molecular motion. A) Increasing the molecular motion reduces the solubility.

B) Increasing the molecular motion decreases the reaction rate

C) Increasing the molecular motion divides the activation energy

D) Increasing the molecular motion increases collision frequency.

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Chemistry

Guest

Why does electronegativity decrease down a family?

A: The sizes of the atoms increase.

B: The sizes of the atoms decrease.

C: The total positive charge increases.

D: The total positive charge decreases.

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Chemistry

Guest

What pressure must be applied to keep a gas at 750 torr and 300 K at a constant volume of 200 mL if the temperature is raised to 450 K?

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Chemistry

Kayley Campos

A student adds solid KCl to water in a flask. The flask is sealed with a stopper and thoroughly shaken until no more solid KCl dissolves. Some solid KCl is still visible in the flask. The solution in the flask is A) saturated and is at equilibrium with the solid KCl B) saturated and is not at equilibrium with the solid KCl C) unsaturated and is at equilibrium with the solid KCl D) unsaturated and is not at equilibrium with the solid KCl

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Chemistry

Guest

When a radioactive isotope releases an alpha particle, the atomic number of the atom is

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Chemistry

Jaylen Rhodes

Be sure to answer all parts. Which product (s) form (s) at each electrode in the aqueous electrolysis of the following salts? Select as many as apply. (a) FeI2 Cathode: Anode: I - (aq) I2 (s) Fe (s) Fe2 + (aq) I - (aq) I2 (s) Fe (s) Fe2 + (aq) (b) K3PO4 Cathode: Anode: O2 (g) H2 (g) H + (aq) OH - (aq) O2 (g) H2 (g) H + (aq) OH - (aq)

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Chemistry

Carlee Cohen

True or false. elements in the same period have the same number of valence electrons

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Chemistry

Cohen Mata

A base a. causes phenolphthalein indicator to change from colorless to pink. b. donates a proton in a proton transfer reaction. c. accepts electrons in an electron transfer reaction. d. produces hydrogen ions in solution. e. does none of the above.

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Chemistry

Lorelai Zavala

Which of these is an indicator that a chemical reaction has occurred?

precipitate forms

temperature remains the same

color is diluted

mass increases

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Chemistry

Trace

The half-life of isotope X is 3 days, how long will it take for one half of 10g sample to decay

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Chemistry

Donovan

A 69.1-g sample of h2o contains how many molecules of water?

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