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Chemistry

Lance Rich

Which best describes indented writing in a forged document

A. Pressing upon the paper to make writing on papers beneath

B. Changing characters with ink of a similar color

C. Covering the original text with a material

D. Eliminating the original text or signature with a razor blade

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Chemistry

Spunky

What are the action and reaction forces when a hammer hits a nail

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Chemistry

Huggie

What does dinitogen mean in a name?

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Chemistry

Davis Holt

How does the level of organization relate to cells? To organ systems?

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Chemistry

Kae

A flexible container at an initial volume of 3.10 l contains 7.51 mol of gas. more gas is then added to the container until it reaches a final volume of 11.9 l. assuming the pressure and temperature of the gas remain constant, calculate the number of moles of gas added to the container.

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Chemistry

Peyton

When 1224 J of heat energy is added to 39.6 g of ethanol, C 2 H 6 O, the temperature increases by 12.6 ∘ C. Calculate the molar heat capacity of C 2 H 6 O.

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Chemistry

Baldwin

A ground state hydrogen atom absorbs a photon of light having a wavelength of 92.30 nm. It then gives off a photon having a wavelength of 1820 nm. What is the final state of the hydrogen atom?

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Chemistry

Plato

If you want water to flow out of a dialysis bag filled with a 50% sucrose solution, what would be the minimum concentration of the beaker solution need to be?

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Chemistry

Paisley Michael

If a solution containing 18.0 g of a substance reacts by first-order kinetics, how many grams remain after three half-lives?

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Chemistry

Greyson Mckee

During an experiment, iron powder and sulfur powder were heated together to form a black mass. It was observed that a magnet, when brought near the black mass, did not attract the black mass. Which of the following correctly justifies the observation?

A. The black mass is a mixture and no longer retains the properties of iron.

B. The black mass is a mixture and retains the properties of iron.

C. The black mass is a pure substance and no longer retains the properties of iron.

D. The black mass is a pure substance and retains the properties of iron.

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Chemistry

Dayanara Davies

If all of the chloride in a 3.734-g sample of an unknown metal chloride is precipitated as agcl with 70.90 ml of 0.2010 m agno3, what is the percentage of chloride in the sample?

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Chemistry

Yareli

The symbol ∆ in a chemical equation means:

precipitate.

heat is supplied to the reaction.

a catalyst is needed.

yields.

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Chemistry

Selena

Give names for the following compounds:

A. Ag2S

B. PdO

C. PtCl4

D. V2O5

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Chemistry

Finn Maynard

What is an advantage for a single cells organisms

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Chemistry

Jaylin Bean

A reaction vessel contains nh3, n2, and h2 at equilibrium at a certain temperature. the equilibrium concentrations are [n2] = 0.31 m, [h2] = 1.51 m, and [nh3] = 0.75 m. calculate the equilibrium constant, kc, if the reaction is represented as

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