What are blocks of time in the geological time scale called?

a. centuries

c. years

b. eras

d. days?

For an exothermic reaction, what effect will increasing the temperature have on equilibrium?

Calculate the pH of a buffer that is 0.205M in NaHCO3 and 0.285M in Na2CO3.

Megan experimented with growing mold. She took 3 pieces of bread from the same loaf and placed each into a plastic sandwich bag. Before sealing the bag. she added 5 drops of water to each slice.

When 20.0 mL of a 0.250 M (NH4) 2S solution is added to 150.0 mL of a solution of Cu (NO3) 2, a CuS precipitate forms. The precipitate is then filtered from the solution, dried, and weighed. If the recovered CuS is found to have a mass of 0.

im found only in plant cells im as green as can be i make food for the plant using the suns energy what am i?

Using special equipment which layer of the sun atmosphere is visible during a total solar eclipse

The characteristic flame test colors of metal ions are due to atomic emission spectra. Duscuss the relationship between the absoption and emission of light and the factors responsible for flame test colors.

Should a bartender use ice and scoop directly from ice machine or use an ice holding device and scoop to make drinks and refill drinks from

What classification should this reaction have? 4Al + 3O2 → 2Al2O3

If you start with 100 grams of a radionuclide, how much will you have after two half-lives have passed?