Elements, Compounds and Mixtures

The chemical symbol for Helium is

• H
• Hg
• He
• O

An example of matter made of only one element is

• water
• gold bar
• light bulb
• salad mixture

What is the most abundant element found in the earth's atmosphere?

• Oxygen
• Sulfur
• Nitrogen
• Argon

The two most common elements found in the oceans are.  Remember oceans are made up of water.

• Sodium and Nitrogen
• Oxygen and Aluminum
• Iron and Carbon
• Oxygen and Hydrogen

Elements are represented by chemical symbol.  Symbols are written with

• all lower case letters
• all capital letters
• always only one  letter
• At least and ONLY one capital letter

The percentage of Nitrogen in the earth's atmosphere is

• one percent
• seventy-eight  percent
• fifty percent
• twenty-one percent

The smallest part of an element is

• proton
• atom
• compound
• mixture

Which of the following statements are characteristics of an element?

I.   Made from a mixture
II.  a pure substance
III. represented by a symbol
IV. make up matter on Earth

• I,II
• I,IV
• II,IV
• II,III,IV

How many elements are in HHe

• 3
• 4
• 2
• 5

Which substance is a compound?

• Chlorine
• Calcium
• Table Sugar
• Sodium