If an element has 15 protons and 32 neutrons what is the: Atomic number? c) Mass number? Number of electrons? d) Complete Symbol?

What's more accurate a beaker or pipet? Explain.

The difference between the formula you just wrote out and the molecular formula of compound E is one atom. That atom is part of the functional group that also acounts for the singlet at 5.4 ppm in the 1H NMR spectrum.

What makes an effective collision

An undergraduate weighed out 20grams of sodium hydroxide pellets. If Na = 23, O = 16 andH = 1, What is the mole of this sodium hydroxide.

Which of the following are not properties of enzymes

What specific clues are used for identifying sedimentary rocks?

The method used in this experiment is sometimes called the vapor density method. The ideal gas equation can be rearranged to solve for the density of a vapor. Which type or types of measurement is not needed to calculate the density of a gas?

Thermochromic ink, for which new uses are appearing in the fashion industry, is able to do what?

What do the quantum numbers of electrons represent?

How much water should be added to 20 ml of 20 % alcohol solution to reduce the concentration to 10 %?