Chemistry Unit Review

Which of the following is true?

• The element Carbon has an atomic number of 12.
• Metals are malleable and have no luster.
• Elements are not pure substances.
• All elements are found on the periodic table.

Which of the following is true about elements?

• All chemicals are elements.
• Elements are pure substances that can't be broken down.
• Elements can be broken down chemically or electrically.
• Elements are made of more than one substance.

What clues tell you that a substance is a compound?

• It is made of one substance.
• It can't be separated.
• It is made of a mixture of elements.
• It has a formula.

The compound H₂SO₄ has how many elements?

• 3
• 4
• 6
• 7

An unknown element is non-malleable, non-lustrous, and non-conductive.  This element is a...

• metal
• metalloid
• non-metal
• undetermined

Which of the following elements is found in all 4 places in nature?

• carbon
• nitrogen
• oxygen
• H₂O

The third picture (c) represents a(n)...

• element
• compound
• mixture
• none of the above

Which choice only contains compounds?

• N₂, H₂O, CO₂
• water, salt, As
• salt, wood, candy
• salt, H₂O, CO₂

Cooking a steak represents a...

• physical change
• chemical change

Dissolving Kool-Aid in water represents a...

• physical change
• chemical change