When the blood supply to a portion of the brain is blocked, this causes

a. a. blackout

b. dizzy spells

c. stroke

d. heart attack

Who was the first to propose the existence of atoms?

The highest concentration of dissolved gases is found in what type of water mass?

What is a simple definition of atom, particle, and kinetic?

Name three factors that influence the rate at which a solute dissolves in a solvent.

A chemical substance that increases the reaction rate and lowers the activation energy needed to start a reaction is called a (n) A chemical substance that that can slow the rate, or stop a chemical reaction entirely, is called a (n) A catalyst is

Amalgam is an alloy that contains mercury and other metals. Which of these atoms would most likely form metallic bonds with mercury? Check all that apply. bromine copper hydrogen iodine silver tin

Which fossil fuel is the most widely consumed in the United States? A. petroleum B. natural gas C. peat D. coal

Why is the use of natural gas as a full becoming more common

A swimming-pool worker wants the pool's pH to be 7.2. She comes by to test the water and finds that the pH is 9.2. What should she do to correct this situation? A. Add water. B. Add base. C. Add acid. D. Do nothing.

What type of rock is sandstone