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Chemistry

Jessie Mccall

if an atom has 4 protons, 5 neutrons, and 4 electrons, what is the mass number of this atom? How do you know?

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Chemistry

Xander Lester

What volume of hydrogen gas can be produced by reacting 4.20 g of sodium in excess water at 50.0 Celsius and 106 kPa? The reaction is 2Na + 2H20 - - > 2NaOH + H2.

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Chemistry

Brenden Barnes

Is athletes foot abiotic or biotic?

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Chemistry

Kingston

What are the mole fractions of HNO3 and water in a concentrated solution of nitric acid (68.0% HNO3 by mass) ? (a) Outline the steps necessary to answer the question. (b) Answer the question

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Chemistry

Marisol Vazquez

How many moles of sucrose are dissolved in 520 mL of solution if the solution concentration is 0.150 M

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Chemistry

Beauty

Calcium, magnesium, and phosphorus are all examples of

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Chemistry

Tito

What does it mean to "simplify" the equation? conclusion:

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Chemistry

Konnor Bates

A sample of water in the vapor phase (no liquid present) in a flask of constant volume exerts a pressure of 438 mm hg at 95 °c. the flask is slowly cooled. a). assuming no condensation, use the ideal gas law to calculate the pressure of the vapor at 93 °c; at 71 °c.

b. will condensation occur at 93 °c; 71 °c? explain.

c. on the basis of your answers in

a. and b), predict the pressure exerted by the water vapor in the flask at 93 °c; at 71 °c.

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Chemistry

Annabella Deleon

Explain the concept of mole ratio as used in reaction stoichiometry problems

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Chemistry

Kaitlynn Sawyer

What does the nucleus of one atom want to do to the electrons of a nearby atom?

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Chemistry

Jaylen Jenkins

What is made up of biotic and abiotic features

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Chemistry

Dominick Noble

A particular country has 50 total states. If the areas of all 50 states are added and the sum is divided by 50 , the result is 196 comma 510 square kilometers. Determine whether this result is a statistic or a parameter.

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Chemistry

Adrienne

Determine the number of bonding electrons and the number of nonbonding electrons in the structure of xe f 2.

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Chemistry

Guest

How do we know when two systems have reached thermal equilibrium? (check all answers that apply)

a) No heat flows between the two systems.

b) One system is colder than the other

c) One system is warmer than the other.

d) The temperatures of both systems are the same

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Chemistry

Agustin Lawson

Which atom has the highest ionization energy? why is the ionization energy in trat atom greater?

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