The sum of the protons and the neutrons in an atom equals the?

Solid ZnCl2 and liquid ZnCl2 have different (1) empirical formulas (3) ion ratios (2) formula masses (4) physical properties

Which of the following is an example of a homogeneous mixture? A. Bronze B. Sand C. Copper D. Zinc

In the presence of oxygen, the cells convert glucose into energy through a process called: Select one: a. anaerobic metabolism. b. respiration. c. perfusion. d. aerobic metabolism.

Nitrogen (N) and hydrogen (H) react with each other to produce ammonia (NH3). This reaction is shown in an equation as N2 + 3H2 → 2NH3. What is the ratio of nitrogen atoms to hydrogen atoms in ammonia? 1 to 2 1 to 3 2 to 1 2 to 3 3 to 1

How many atoms of copper are in a pure copper penny that weighs 2.15 g? (1 amu = 1.6605 10-24 g) ?

After a particularly cold day outside you go home to make some tea. you heat the water in the mug so that botch are about 75 degrees celcious. the tea bag is only 30 degrees celcious and the room is around 26 degrees celcious.

For main-group elements using the older numbering system the group number on the periodic table corresponds to which characteristic of the elements of that group

In the vertical columns of the periodic table, as the atomic numbers increase: a. the number of electron shells increases. b. the ionization energies increase. c. the number of electrons in the valence shell increases. d.

Which of the following solutions contains the largest total concentration of ions, assuming complete dissociation .010 M aluminum chloride .010M sodium chloride .010M aluminum sulfate .010M calcium chloride

What is the relationship between chemical equilibrium and the rates of forward and reverse reaction? a. In equilibrium, the forward reaction rate must be greater than the reverse reaction rate. b.