If a sample of a substance contains 9.03 x 10^23 representative particles, how many moles does this represent?

What are the functions of ammonia in the solvay process

Which of the following best states the difference between an alcohol and an ether? In an alcohol, a carbon atom is double bonded to an oxygen atom; in an ether, a carbon atom is triple bonded to another carbon atom.

What does dna make up

How many protons and neutrons does lithium have?

Consider the following equilibrium: B (aq) + H2O (l) ⇌HB + (aq) + OH - (aq) Suppose that a salt of HB + is added to a solution of B at equilibrium. Part A Will the equilibrium constant for the reaction increase, decrease, or stay the same? A.

Which of the following represents a chemical change? Bending a wire Freezing of water Fireworks exploding Melting of a wax candle

5.00 L of a gas is collected at 100K and then allowed to expand to 20.0 L. What must the new temperature be in order to maintain the same pressure? A. 400 °C B. 127 °C C. 223 °C D. 627°C

Before the initial explosion was the matter hot or cold

Which of the following atoms has seven valence electrons? chlorine (Cl) nitrogen (N) manganese (Mn) oxygen (O)

A.) During an experiment, a student adds 2.90 g of CaO to 400.0 mL of 1.500 M HCl. The student observes a temperature increase of 6.00 °C. Assuming the solution/'s final volume is 400.0 mL, the density if 1.00 g/mL, and the heat capacity is 4.