Determine the number of significant figures in the measurement 0.0030020 s.

Which of the following is true about a scientific theory A. A theory can never be changed B. A theory can be changed to explain new observations or experimental results C. A theory can be formed after a single experiment D.

An atom has + 14 Protons, 15 Neutrons, and - 14 Electrons, what is the charge of it's nucleus?

Water can be formed in the following reaction: 2H2+O2-->2H2O If you have 10 moles of Hydrogen gas (H2), how many moles of water can you form? (Enter just the number: not the number and units)

What is the energy of a 933 nm wave?

A frog's tongue is anchored in the very front. Why?

Which of the following is true concerning the noble gases? A. Their highest occupied s and p sublevels are filled. B. They belong to Group 8A. C. They are sometimes referred to as the inert gases. D. all of the above

Which of the following is responsible for passing albinism from a parent organism to its offspring?

Rubidium has two naturally occurring isotopes, rubidium - 85 (atomic mass = 84.9118 amu; abundance = 72.15%) and rubidium - 87 (atomic mass = 86.9092; abundance = 27.85%). Calculate the atomic weight of rubidium

You are asked to analyze an aqueous solution (X) and determine what's in it. You pour some of your sample X into a test tube and add a few drops of an acid. No observable reaction occurs.

Which of the following items represents a chemical change? burning melting evaporation freezing