Which of these substances are molecules?

1. H2O

2. NaCl

3. N2

4. O2

Question 12 options:

3 and 4

All of them

1 and 2

None of them

Describe how fuel oil can be changed into gasoline?

Explain familiar forces that cause object to move

The variable n represents the fraction of nuclei left after one half-life the amount of time it takes half of the radioactive atoms to decay. the number of half-life cycles C. the number of half-life cycles

How is the electron cloud model different from the model proposed by Bohr? A. the electrons of an atom travel in distinct paths around the nucleus B. the precise location of electrons at a specific time is unknown C.

A small quantity of the inert gas argon (Ar) is added to incandescent light bulbs to reduce vaporization of tungsten (W) atoms from the solid filament. What volume of argon gas measured at 760 mmHg is needed to fill a 0.

At 25°C 12 M H202 is decomposed after 30 minutes the concentration of the H2O2 is found to be 9.5 M what is the average reaction rate for this decomposition reaction.

Give an example of a solution that can be seperated by simple distilation.

What is the h + concentration for an aqueous solution with poh = 3.35 at 25 ∘c? express your answer to two significant figures and include the appropriate units?

What information does a phase diagram give

Which cell structures function like power plants for plant or animal cells? A. nuclei B. vacuoles C. ribosomes D. mitochondria