Which of the following statements concerning buffers is false?

a. Buffers contain appreciable amounts of a weak acid and it conjugate base.

b. The pH of a buffer is close to the pKa of the weak acid from which it is made.

c. Buffers are used to titrate weak bases.

d. Buffers are resistant to changes in pH brought about by addition of strong acids and bases.

e. Buffers are resistance to changes in pH brought about by addition of water.

You may expect bonds between two atoms which each have n covalent lonic metallic hydrogen

Match the following vocabulary terms to their definitions. 1. amount of energy required to change 1 gram of material from the solid to the liquid state at its melting point 2. a measure of the kinetic energy of the particles of a substance 3. the amount of heat energy required to raise the temperature of 1 gram of liquid water from 14.5°c to 15.5°c 4. amount of energy required to change 1 gram of material from the liquid to the gaseous state at its boiling point 5. the amount of energy required to change 1 gram of a substance 1°c a. temperature b. latent heat of vaporization c. latent heat of fusion d. calorie e. specific heat

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils.the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.