An effective collision between reactant particles requires the particles to have the proper what?

Why does air exert pressure? because air has mass because the atmosphere is thick due to wind moving air due to increased temperature

How many atoms of hydrogen are in 170 g of hydrogen peroxide (h2o2) ?

Which of the following physical properties of stars are plotted on an HR diagram? Absolute brightness and size Apparent magnitude and mass Apparent magnitude and luminosity Absolute brightness and temperature

What is the pH of a 0.028M solution (pH=-log (M)) A) 3.56 B) 2.88 C) 1.55 D) 1

Who was the first U. S. secretary of state to ever visit the remote cook islands in the south pacific

Sodium and chlorine can bond together. sodium gives chlorine a needed electron. what is chlorine's charge after accepting the electron?

What astronomical equiptment did hypatia use?

Name each activity or observation as either physical or chemical change. 1) Boiling water for pasta 2) Digesting food 3) Soda goes "flat" 4) Stretching a rubber band 5) Grilling a hamburger 6) Adding sugar to tea 7) Adding lemon to tea 8) Mowing the

Ironing a shirt is an example of ... convection conduction radiation condensation

Which compound conducts electricity only in the molten state? A. sodium bromide B. calcium hydroxide C. barium sulfate D. magnesium sulfate