How old is Earth according to the geological time scale?

A. 290 million years old

B. 542 million years old

C. 2.5 billion years old

D. 4.6 billion years old

Liquids and solids are referred to as "condensed phases" because the attractive forces

What is the #1 or main component of the earths ancient atmosphere?

A sample of SO3 is introduced into an evacuated sealed container and heated to 600 K. The following equilibrium is established: 2SO3 (g) ⇌2SO2 (g) + O2 (g). The total pressure in the system is found to be 3.0 atm and the mole fraction of O2 is 0.12.

Explain why, when the imidazole ring of histidine is protonated, the double-bonded nitrogen is the nitrogen that accepts the proton. (hint: localized electrons are more apt to be protonated than delocalized electrons.)

Pure water is neutral. if water is neither an acid nor base what is the ph of the water

The bonds in the compound MgSO4 can be described as A. ionic, only B. covalent, only C. both ionic and covalent D. neither ionic nor covalent

If The mass of a box is increased and the force stay the same, determine the relationship with acceleration

A balloon contains 0.15 moles of co2 gas. how many molecules of co2 are in the balloon?

Acids A) are generally proton donors B) produce H + ions in solution C) are electron pair acceptors D) may include all of these characteristics

3.011 x 10^23 atoms F in grams