Warm-up - Periodic Table - February 11, 2020

Which pure substance is composed of more than one element?

• carbon

• gold

• water

• sodium

The atomic number of an atom is always equal to the total number of

• neutrons in the nucleus

• protons in the nucleus

• neutrons plus protons in the atom

• protons plus electrons in the atom

Which statement best describes electrons?

• they are positive subatomic particles and are found in the nucleus

• they are positive subatomic particles and are found surrounding the nucleus

• they are negative subatomic particles and are found in the nucleus

• they are negative subatomic particles and are found surrounding the nucleus

Because Carbon cannot be broken down and changed into simpler substances, it is classified as _ _ _ _.

• an element

• a compound

• a mixture

• a molecule

Neon and sodium are examples of

• metalloids

• compounds

• mixtures

• elements

A substance formed when 2 or more elements chemically combine is known as a _ _ _ _.

• compound

• metalloid

• solution

• mixture

Water is _ _ _ _.

• an element

• a compound

• a mixture

• a solution

Which substance can be broken down by chemical change?

• sodium

• argon

• sulfur

• ammonia

How many neutrons does Oxygen have?

• 15.999

• 16

• 23

• 8

Which of the following is an example of a solution?

• salt water

• rocks and sand at the beach

• iron filings and sulfur powder mixed together

• drop of pure water