In an electrically neutral atom of any element, there are equal numbers of A) protons and neutrons.

B) electrons and protons.

C) electrons and neutrons.

D) atomic number and atomic mass.

Sodium tripolyphosphate is used in detergents to make them effective in hard water. calculate the oxidation number of phosphorus in na5p3o10. assume that all the phosphorus atoms have the same oxidation number.

A rocket can fly into space because? A. when it is launched, the hot exhaust gases hit the ground and push the rocket forward. B. the rocket pushes the exhaust gases backward, and there is an equal and opposite reaction pushing the rocket forward. C.

Which of the following would shift the following equilibrium system to the right? C2H2 (g) + H2O (g) ⇌ CH3CHO (g) Removing H2O (g) from the system Adding CH3CHO (g) to the system Removing C2H2 (g) from the system Adding H2O (g) to the system

The correct name for CaH2 is

Draw the lewis formula for chlorobenzene, a benzene derivative. include all hydrogen atoms and lone pairs.

Which pair of nitrogen bases will form a bond in a DNA molecule? a. cytosine and adenine b. adenine and thymine c. guanine and thymine d. thymine and cytosine

Most meteors that fall into the earths atmosphere burn up before reaching the ground. Why is this?

Imagine a chemist is in the lab and trying to make some chemical reactions happen. In one reaction she reacts chemicals in an exothermic reaction and there is an increase in entropy.

Which of the following requires an oxidizing agent? Al yields Al3+ 2 O yields O2 Cl2 yields 2 Cl- Ag + yields Ag

Type of ion formed by group 2A elements