When a 2 kg log is burned, it produces 0.5 kg of ash. Explain why the mass of the ash is less than the mass of the log. In other words, where did all of the mass go?

How many molecules are in 4.00 x 10^-23 moles of N2O5?

What is the first step when measuring out acid

Select all of the answers that apply. Which of the following are ways the atmosphere supports life? contains trace gases blocks harmful UV rays transports and distributes heat cycles essential elements: C, O, and N

What bond causes electron sharing among many atoms

How many moles of copper are present in a sample of tennantite with a mass of 2290 grams?

A phase change from a solid to a gas is called what

What is hydrocarbon?

Why did most scientists reject Wegner's theory for nearly a half century?

Define prediction and explain how it is used to formulate a hypothesis.

A group of organisms that breed and produce offspring that can breed. A. Species B. ecosystem C. Biodiversity