Which of the following elements is a metal?

a. Boron

c. Magnesium

b. Nitrogen

d. Carbon

How many moles of SO3 are in 2.4x10^24 molesculea of SO3

Which spacecraft exploded during flight killing all astronauts?

10. How do substances change after a chemical reaction? cal A They lose mass. B Their atoms are rearranged. C Their atoms lose electrons. D They change phase.

Listen example of how to test a hypothesis using a scientific inquiry

How does the molecular property of water affect its cohesive properties?

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?