Why is a depletion of the ozone layer harmful?

A) It increases chlorofluorocarbons (CFCs).

B) It allows increased amounts of UV radiation to reach Earth's surface.

C) It increases crop yields.

D) It contaminates ground water.

A nuclear reaction in which two atomic nuclei are combined to produce a single large nucleus and energy is released by the reaction is know as:

Which is visible to the naked eye? A) atoms B) substances that atoms make up C) attractive forces D) chemical bonds

Which equation represents a neutralization reaction? A) 6HC1O - > 4HCL + 2HCLO3 B) CH4 + 2O2->CO2+2H20 C) Ca (OH) 2+H2SO4->CaSO4+2H2O D) Ba (OH) 2+Cu (NO3) 2->Ba (NO3) 2+Cu (OH) 2

if a sample of gas at 25.2°C has a volume of 536 ml at 637 torr, what will its volume be if the pressure is increased to 712 torr?

Which answer best explains the relationship between size and mass of the sun?

Which usually has a higher temperature? A city or the areas around the city?

Toluene and pyridine form ideal solutions. Consider a solution of toluene and pyridine prepared at 25°C. Assuming that the mole fractions of toluene and pyridine in the vapor phase are equal, calculate the composition of the solution.

Formula for water what does the lack of a subscript after those O indicate

Why do the chemical properties cycle through each period? Every eighth element starting with hydrogen restarts the transition from metal to inert gas. Elements with atomic numbers which are multiples of eight start a new period.

Which statement correctly describes the Ka of a weak acid? The Ka is large, and the equilibrium favors products. The Ka is large, and the equilibrium favors reactants. The Ka is small, and the equilibrium favors products.