Which event always involves a chemical change?

boiling

melting

conducting

burning

What is the reaction of this chemical formula? CaSO4 (aq) + HCl (aq) - - >?

No two elements can have the same spectrum. True False

Bobby's mom sets a small pot of water on the stove and lights the burner. Ten minutes later, Bobby notices small bubbles and sees that the water is almost boiling. Which of the following could possibly be the temperature of the water in the pot?

Write a question about how changing temperature affects a gas.

27 Which energy conversion must occur in an operating electrolytic cell? (1) electrical energy to chemical energy (2) electrical energy to nuclear energy (3) chemical energy to electrical energy (4) chemical energy to nuclear energy

12 Two molecules of HBr collide and then form H2 and Br2. During the collision, the bonds in the HBr molecules are

If the two charges represented in the figure were brought near each other, they would a. have no effect on each other. b. repel each other. c. cause static discharge. d. attract each other.

A gas tank holds 20000 liters at 850 torr. If the temperature remains constant, what will the volume, in L, of the gas be at standard pressure, 760 torr?

Which Group (column on the Periodic Table) is the least soluble?

When ironing clothes, the primary method of heat transfer is A) conduction. B) convection. C) insulation. D) radiation.