To how many significant figures should each answer be rounded? (6.626x 10-34 J·s) (2.9979x 108 m/s)
equation A:
= 4.253551477516 x 10-19 J(unrounded)
4.670 x 10-7m
After rounding, the answer to equation A should have
O 3 significant figures.
O2 significant figures.
4 significant figures.
5 significant figures.
1 significant figure.

Two friends at different locations want to communicate with each other by sending low energy signals. which of the following methods can they use to communicate? a) produce x-rays using colliding electrons and send them to radios, which capture sound b) send messages using infrared radiation, which travel in the form of waves c) send radio waves through intervening media like radio and television d) produce sound waves using microwaves from heated objects

The molality of calcium chloride (cacl2) in an aqueous solution is 2.46 m. what is mole fraction of the solute?

On the periodic table, elements are arranged by which of the following. a. mass numbers. b. increasing atomic number. c. alphabetical order. or d. density