The tendency of an element to react is closely related to

a. its atomic mass.

b. attractions between its atoms.

c. the number of valence electrons in atoms of the element.

d. the ratio of protons to neutrons in atoms of the element

What examples of a solid turning into a liquid

Each of the following solutions is separated from a solution containing pure water with a semipermeable membrane. Assuming they all have the same temperature, rank the solutions from the highest to the lowest osmotic pressure.

A sample of an ideal gas at 1.00 atm and a volume of 1.82 L was placed in a weighted balloon and dropped into the ocean. As the sample descended, the water pressure compressed the balloon and reduced its volume. When the pressure had increased to 15.

Select the correct answer. An object is acted upon by a force of 22 newtons to the right and a force of 13 newtons to the left. What is the magnitude and direction of the net force? A. 9 newtons to the right B. 9 newtons to the left C.

Heart cells require a certain balance of sodium and potassium ions to function. The blood, which is approximately 83% water, carries these two types of ions to the heart.

In the process of covalent bonding, atoms share electrons. This means that * a) Electrons from each atom are attracted to the nucleus of both atoms b) Protons and neutrons attract c) Atoms lose electrons and become ions d) Atoms gain electrons and

5. How are compounds different from mixtures?

Which statement about the density of warm water is most likely correct? Warm water is more dense than cold water. Warm water is less dense than cold water. The density is the same for warm and cold water.

Sodium ions are used by your body every time you move a muscle. The difference between the Na + ions and atomic Na is that A) ionic sodium has one more electron. B) atomic sodium has one more electron. C) atomic sodium has one fewer electron.

In which equation does the term "heat" represent heat of fusion? (1) NaCl (s) + heat - - >NaCl (l) (2) NaOH (aq) + HCl (aq) - - >NaCl (aq) + H2O (l) + heat (3) H2O (l) + heat - - > H2O (g) (4) H2O (l) + HCl (g) - - >H3O + (aq) + Cl - (aq) + heat