Blog

According to the two-factor theory, the two basic components of emotions are _______ and __________.

Motivation is solely driven by external rewards rather than internal desires or needs.

The half-life of technetium-99 is 6.0 hours. How much of a 50.0 mg sample will remain after 24 hours?

Colligative properties depend on the concentration of the particles in a solution, rather than on their identity.

Rank the following substances in order of increasing intermolecular forces: Ar, H2O, N2, O2

Which of the following substances can participate in hydrogen bonding?

When a solution of lead (II) nitrate is mixed with a solution of potassium chromate, a yellow precipitate forms according to the equation:  Pb(NO3)2(aq) + K2CrO4(aq) → 2 KNO3(aq) + PbCrO4(s)  What volume of 0.105 M lead (II) nitrate is required to react with 100.0 mL of 0.120 M potassium chromate?

When sodium hydroxide, NaOH, is dissolved in water, which species are present in addition to water?

If the pH of a blood sample is 7.60, what is the H3O+ concentration in the blood?

We need 28.18 mL of 0.2437 M HCl solution to completely titrate 25.00 mL of Ba(OH)2 solution of unknown concentration.  What is the molarity of the barium hydroxide solution? (Hint: First, write a balanced equation for the reaction.)