Elements, Compounds, and Chemical Changes

Which of the following is the best description of an element?

• A pure substance that cannot be broken down into a simpler substance. 
• A naturally occurring mineral made of more than one substance. 
• A small particle made with a specific chemical composition.
• A collection of atoms that have different abilities when joined together. 

This table has two columns of different kinds of matter. Which of the following is the best label for the second column?

• Atoms
• Pure Substances
• Compounds
• Mixtures

Which of the following elements is one of the major components of living organisms?

• sulfur
• carbon
• copper
• silicon

Which of the following is a compound?

• Oxygen
• Helium
• Salt
• Chlorine

Which of the following is true about compounds?

• They are never a pure substance.
• They can easily be separated.
• They consist of only one type of atom.
• They are made up of 2 or more elements

One way to tell how many element a compound is made of is to - 

• Count the capital letters
• count all of the letters
• add up all the numbers
• take the square root of the sum of all the numbers

Which element makes up most of the Earth's Atmosphere?

• Carbon
• Oxygen
• Nitrogen
• Silicon

Which element is most abundant in the Earth's Lithosphere?

• Oxygen
• Carbon
• Nitrogen
• Calcium

Which element is most abundant in the Earth's  hydrosphere

• Oxygen
• Carbon
• Nitrogen
• Calcium

How many elements are in this compound: 

• 3
• 6
• 4
• 5