Plastics becoming brittle after being left in the sun ... Is it exothermic or endothermic?

Which one of these everyday products is a mineral A.) Plastic B.) salt C.) wood D.) paper

You have two balloons of equal volume at room temperature and 1 atm pressure. One balloon is filled with He and the other is filled with H2. Which statement is true about the relative number of gas particles in the two balloons?1.

What fraction or percentage of carbon atoms has a mass of 12.011 amu?

All atoms of an element always have the same number of a Protons b Neutrons Electrons d Electrons

How do you know if an atom is stable?

What is the [H3O+] of a solution with a pH of 2.56? 2.56 M, 2.75 x 10-3 M, 363 M, or - 0.408 M

What is the law of conservation of energy? A) energy can only be destroyed B) energy will always be renewed. C) energy cannot be created of destroyed. D) energy can never change forms.

Most metals are solid at room temperature, malleable, ductile, good conductors of heat and electricity, and react in acids to produce hydrogen gas. which of the properties mentioned is a chemical property? a. are malleable b. reacts with acids c.

Silver tarnishes when it comes into contact with hydrogen sulfide in the air. physical property or chemical property

When a volcanic irruption adds new rock to existing land and forms new islands is it considered destructive?