The earliest known human ancestors are believed to have lived 3 billion years ago. True or False

True or False a gas that ignites a glowing splint is oxygen

Noble gases 1. behave as metals when they react. 2. are also transition elements. 3. do not react under normal conditions. 4. behave as metalloids when they react.

You walk into the front door of your home. You smell an onion that someone is cutting in the kitchen. Explain why you are able to smell it, what the process is called, and list at least three other examples of substances that exhibit this behavior.

Why does an apple look red to us?

Which structure is the most stable (lowest energy resonance contributor?

What is the term for the amount of salts in water? Evaporation Evaporation Salinity Thermocline Density

In an acid-base titration, of 20 ml of a m HCI solution with 1 m NaOH. How many ml of NaOH are needed

Which of the following is not a source of air pollution related to human activities

Objects and substances in motion is I

If you were to remove an electron from a sodium atom that has eleven protons, what would be the electrical charge of the ion?