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Chemistry

Frank Richardson

The atomic number of an atom identifies the number of protons in its nucleus.

If the overall charge on the atom is neutral, what must the atomic number also identify?

A.

the most common isotope's mass

B.

the average mass of all isotopes of the atom

C.

the number of electrons in the atom

D.

the number of neutrons in the atom

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Chemistry

Chaim Vega

A solution containing 2.8 moles of magnesium bromide is combined with a solution containing excess potassium carbonate. This chemical reaction takes place:

MgBr2 (aq) + K2CO3 (aq) → MgCO3 (s) + 2KBr (aq).

If the volume of the resulting solution is 1.33 liters, what's the concentration of potassium bromide? Use the periodic table.

A.

0.24 M

B.

2.1 M

C.

3.7 M

D.

4.2 M

E.

5.6 M

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Chemistry

Jake Hernandez

A cylinder contains oxygen at a pressure of 10.0 atm and a temperature of 300.0 K. The volume of the cylinder is 10,000 mL. What is the mass of oxygen gas?

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Chemistry

Lina Kramer

When are roman numerals used when naming compounds?

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Chemistry

Karla Carlson

How many mL of alcohol are in 240 mL of 95.0% alcohol solution?

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Chemistry

Bridget Underwood

Redox titrations are used to determine the amounts of oxidizing and reducing agents in solution. For example, a solution of hydrogen peroxide, H2O2, can be titrated against a solution of potassium permanganate, KMnO4. The following equation represents the reaction: 2KMnO4 (aq) H2O2 (aq) 3H2SO4 (aq) →3O2 (g) 2MnSO4 (aq) K2SO4 (aq) 4H2O (l) A certain amount of hydrogen peroxide was dissolved in 100. mL of water and then titrated with 1.68 M KMnO4. What mass of H2O2 was dissolved if the titration required 20.8 mL of the KMnO4 solution

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Chemistry

Siena Chan

An aqueous solution of sucrose (C12H22O11) is prepared by dissolving 6.4475 g in sufficient deionized water to form a 100.00 mL solution. Calculate the molarity of the solution.

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Chemistry

Colt Gay

How will the behavior of the gases in the piston chamber change if heat is applied to the system? Assume the piston moves to keep the pressure constant.

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Chemistry

Jaime Ross

A chemist measures the amount of iodine solid produced during an experiment. she finds that 1.6 g of iodine solid is produced. calculate the number of moles of iodine solid produced.

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Chemistry

Esmeralda Pierce

Consider the cooling curve above. The substance is changing state from a gas to a liquid to a solid. As the temperature changes we also know that

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Chemistry

Wilson

1 kg is equal to

103 hg.

103 g.

10-2 cg.

10-2 g.

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Chemistry

Jesse Gamble

What is the difference in electronegativity between hydrogen and chlorine?

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Chemistry

Kirsten Decker

What kind of bond shares electrons among many atoms and is ductile?

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Chemistry

Gretchen Carroll

Balance the following equation: C + SO2 = CS2 + CO

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Chemistry

Carter Dougherty

Elvin is asked to analyze a 0.353 gram sample of metal. He measures the amount of heat

released by cooling it from 50.0 °C to 22.0 °C as 2.28 J. What is the specific heat of this metal?

What metal could this be?

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