How me and other scientists know about animals that went extinct for million people million of years ago

How many sulfur atoms are there in 3.5 mol of sulfur? express your answer using two significant figures?

Counting ten bikes on a bike rack is an example of a qualitative observation.

You turn on a lamp. The amount of light energy released by the light bulb is less than the amount of electrical energy that flows into the lamp.

Which step in the process of scientific inquiry leads to the development of a testable hypothesis?

An element is a pure substance that is defined by the number of protons in which is defined as the atomic number

This reaction describes cellular respiration. C6H12O6 + 6O2 → 6CO2 + 6H2O Which compounds are the reactants and which are the products? A. reactants: C6H12O6 + 6O2 products: 6CO2 + 6H2O B. reactants: 6CO2 + 6H2O products: C6H12O6 + 6O2 C.

Name two properties that display periodicity across the periodic table.?

Which characteristics is not a characteristic of plastic? A. Easy to mold B. Good conductor of heat C. Lightweight and durable D. Repels water.

During a test trial, the control and test group are both given a pill. To account for the effect patients may think the drug being tested is having just because they believe they're being treated, the control group is given a "sugar pill," which is

The ir spectrum of which type of compound will not show evidence of hydrogen bonding?