1st 9 weeks review

Which characteristics describe a compound (Select all that apply):

• Compounds are made from two or more elements

• A compound is a pure substance

• Compounds are represented by a chemical symbol

• Compounds are represented by a chemical formula

True or False: A Compound is a Pure Substance

• False

• True

True or False: A compound is represented by a chemical formula

• True

• False

True or False: An element is represented by a chemical symbol

• True

• False

Which of the following substances represents a compound?

• Cr

• CaO

• He

• KF

Which of the following represents an element

• Water

• Copper

• Carbon Monoxide

• Salt

Which of the following substances is a compound?

• Water

• Copper

• Hydrogen

• Carbon

Which of the following are elements:

• Copper-Cu

• Nitrogen-N

• Water- H2O

• Salt- NaCl

Which of the following substances represent an element

1. CO 4. CN
2. Ag 5. Db
3. HI 6. Xe

• 2, 3, 5, and 6

• 1 and 4

• 2, 5, and 6

• 1, 3, and 4

How many different elements make up this compound?

C₁₇H₂ON₄NaO₉P

• 6

• 8

• 32

• 7