Which of these substances are molecules?

1. H2O

2. NaCI

3. N2

4. O2

Answer choices

A) 1&2

B) All of them

C) None of them

D) 3&4

Place the following in order of increasing F-A-F bond angle, where A represents the central atom in each molecule.

What is true if mass is conserved in a reaction (a) there are more atoms on the reactants side (b) there are equal number of atoms on both sides (c) there are more atoms on the products side (d) the number of atoms on each side change

Dry ice is sometimes used for special effects to form a "fog" as it sublimes from the solid to the gaseous state. If 99.

A rigid framework of many ions locked together in a repeating pattern is called a (n)

Zn (s) + 2HCl (aq) - > ZnCl2 (aq) + H2 (g) Which half reaction correctly describes the oxidation that is taking place?

Which of the following is not required for osmosis to occur? View Available Hint (s) Which of the following is not required for osmosis to occur? selectively permeable membrane water concentration gradient cellular energy

The volume of 1 mole of o2 gas at T=273k P=1atm is? A 6.02 x 10^-23 ml B 760 L C 22.4 L D 2.24 L E 224 L

There are two stable isotopes of bromine. Their masses are 78.9183 and 80.9163 amu. If the average atomic mass of bromine is 79.9091 amu, what is the natural abundance of the heavier isotope? percent abundance of 81Br __%

If 1.00 mol of argon is placed in a 0.500-L container at 20.0 ∘C, what is the difference between the ideal pressure (as predicted by the ideal gas law) and the real pressure (as predicted by the van der Waals equation) ? For argon, a=1.

Which of these is a covalent compound? 1. AICI3 2. CO 3. MgO 4. LiCI