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Chemistry

Explain why or why not the change is a chemical change or not.

A. The outside of a piece of cheese has turned green from mold.

B. An antacid tablet dissolves in water and forms carbon dioxide.

C. Ice melts and forms a puddle of water.

D. A piece of clay is broken in half.

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Chemistry

How many lone pairs are on the central atom in BCl3

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Chemistry

Physical features on earth that form political divisions

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Chemistry

In a solution the solute is the substance present in the greatest amount true or false

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Chemistry

Which is a substance that is made up of only one type of atom? compound element solution mixture

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Chemistry

Identify the functional group (s) that appear in the molecule below. oh

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Chemistry

Which of the following structures are not found in aliphatic compounds?

a. aromatic rings

c. cycloalkanes

b. alkanes

d. single-bonded carbon molecules

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Chemistry

Would you expect the nonbonding electron-pair domain in NH3 to be greater or less in size than for the corresponding one in PH3?

* greater

* lesser

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Chemistry

Which one of the following ions would be negatively charged with a charge of - 2?

10 electrons, 8 protons

18 electrons, 16 neutrons

0 electrons, 2 protons

6 electrons, 8 protons

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Chemistry

Write the full ground-state electron configuration for each:

(a) S (b) Kr (c) Cs

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Chemistry

Any element in family 18 (the noble gases) Any element in families 1-17 A letter Write a letter answering the question, "Why won't you bond with me?" Be creative and give specific details! ... ?

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Chemistry

Does a dilute solution contains a small amount of solute

relative to the solute's solubility?

True or false?

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Chemistry

Oxygen (O) is a gas found in the 16th column of the periodic table. What statement is true about oxygen and the other elements in that column?

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Chemistry

Two gases, A and B, are at equilibrium in a sealed cylinder. Individually, gas A is colorless, while gas B is dark colored. The reaction might be written as: A (g) equilibrium reaction arrow 2 B (g). (a) The cylinder should appear (color or colorless) (b) When the system is cooled, the cylinder's appearance becomes very light colored. Therefore, the reaction must be (endothermic or exothermic) Suppose the reaction equation were written as follows: 2 B (g) equilibrium reaction arrow A (g) (c) Which of these statements would then be true? (Select all that apply.) a The value of K would not change. b The ΔH value would have the same magnitude value but opposite sign. c The K expression would be inverted. d The color of the cylinder would be darker.

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Chemistry

How many grams of naoh would react with 507 g fecl2 in the reaction fecl2 + 2naoh fe (oh) 2 (s) + 2nacl?

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