9. When two compounds are made up of the same number and kind of atoms, but differ in

their molecular structure they are known as:

A) isotopes

B) homologs

C) isomers

D) hydrocarbon

Which of the following compounds is a covalent (i. e., molecular) compound? A. Na2CO3 B. NaOH C. C2H4O2 D. MgBr2

Which describes isotopes? Check all that apply.

What is most likely to occur along a transform boundary?

A hydrogen bond is: a. a strong attraction between hydrogen and another atom. b. a bond between a hydrogen atom already covalently bound to one atom and made partially negative by unequal electron sharing with another atom. c.

If 14.3 moles of H2O2 is decomposed, how many grams of oxygen gas are produced?

What substance cannot be decomposed by physical or chemical means?

Paula is camping with her family. After their parents light a fire, Paula and her sister stand nearby to warm their hands. Her sister thinks that conduction warms their hands. Paula disagrees.

What does it take to prove a hypothesis false? O A. It is impossible to prove a hypothesis false O B. At least ten examples O C. One counterexample O D. A poorly stated question

What new inforamtion can you add the your definition of physical change?

What are groups 1, 2, and 3 examples of on a periodic table of elements? A) Metals B) Nonmetals C) Metalloids D) Noble gass