23 - 24 Semester Review

Which of the following is an example of an ELEMENT?

• Water - H2O

• Salt - NaCl

• Neon - Ne

• Methane - CH4

Which of the following is an example of a COMPOUND?

• Cobalt - Co

• Ammonia - NH3

• Carbon - C

• Lithium - Li2

Which of the following is a compound?

• Co
• He
• CO
• H

Which best describes a compound? 

• found on the periodic table 
• made from two or more elements
• a pure substance 
• only 100 in the world 

Elements are represented by a...

• More than one capital letter
• Chemical symbol 
• Chemical formula 
• Oxygen 

Is salt NaCl a compound or a element?

• Element
• Compound

A change where one or more new substances are created.

• Physical Change 
• Chemical Change 

Ice melting

• Chemical Change
• Physical Change

Which of the following is a sign that a chemical reaction has occurred?

• change in shape
• melting
• formation of a gas
• dissolving

Which of the following situations provides evidence that a chemical change has taken place?

• Water, when boiled, evaporates and turns in vapor
• Sugar, when added to ice tea, dissolves into liquid
• Two liquids are mixed, and a solid substance forms
• A piece of paper is cut into small small pieces