Why do all humans have similar features? A. They have the same number and kinds of chromosomes. B. They have identical alleles. C. They have different alleles. D. Their genes do not allow for any variation.

1. Islands in the middle of the oceans (for example, Great Britain, Hawaii, Bermuda) tend to have more stable climates with smaller temperature fluctuations than regions of the same mass surrounded by land (for example, continents).

What would happen if a sodium (Na) atom and a neon (Ne) atom were put near one another? A. A bond would not form. B. An ionic bond would form. C. A covalent bond would form. D. They would cancel each other out.

If you start with 5 molecules of O2 in the reaction 2Mg+O2--> 2MgO, how much Mg will you need? a. 4 c. 8 b. 5 d. 10

The atomic mass of N is 14.01 g/mol, and the atomic mass of H is 1.008 g/mol. What is the molecular mass of NH3? 17.03 g/mol 15.018 g/mol 14.12 g/mol 45.054 g/mol

which is greater, the number of compounds or the number of elements? the number of elements or the number of isotopes?

Predict whether or not a precipitate forms upon mixing 175.0 ml of a 0.0055 mkcl solution with 145.0 ml of a 0.0015 m agno3 solution. identify the precipitate, if any.

The nucleus of one boron atom has 5 protons and 4 neutrons wjat is the total number of electrons in a boron atom

Pure sodium metal explodes when it makes contact with water, and chlorine, in its natural state, is a deadly, poisonous gas. When these two chemicals combine, they form a harmless, white powder known as sodium chloride or table salt.

Why reducing power of elements increase, on moving down a group?

Which of the following is not a result of air pollution? A. Smog B. Breathing problems C. Global warming D. Soil erosion