What is the main cause of earthquakes?

a. erosion of topsoil by rivers

b. large ocean waves called tsunamis

c. animals burrowing underground

d. movement of tectonic plates

What is the mass of 9 atom (s) of copper in grams?

Where does an element take it's density from

Which of these is a mixture? A. carbon B. carbon dioxide C. air D. oxygen

How can the concept of density be used to differentiate between a genuine diamond and an imitation diamond

The word atom means invisible?

How does a mixture of benzoic acid and benzaldehyde can be isolated separately by extractions?

What is a compound? a) a combination of two or more substances that are not chemically combined b) a combination of two or more elements that are combined in a certain ratio

A gas has a volume of 75mL at a pressure of 200.0 kPa. What will be the new volume be in mL if the pressure is decreased to 60.0 kPa in sig figs

Give two reasons why it's important to work with a partner in a lab

Suppose you have 3.00*1018 reams of lead (pb). how many lead atoms do you have? express the number of atoms numerically.