The book will serve as a flat surface on which you
will later place additional weights. It has its own
mass, which you need to measure.
Zero the balance. Place the book on the balance
Measure the mass to the nearest gram (1 g).
g
497.6809
ZERO

What is the ph of a solution with a 1.50 × 10−9 m hydroxide ion concentration?

If a 60-g object has a volume of 30 cm3, what is its density? 2 g/cm3 0.5 cm3/g 1800 g * cm3 none of the above

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