Elements / Compounds / Chemical Change

Which of the following elements is not in the compound Na₃PO₄?

• nitrogen

• sodium

• phosphorus

• oxygen

Which of the following elements is in the compound Hg₂Cl₂?

• hydrogen

• carbon

• mercury

• helium

Because sulfur cannot be broken down into two or more different substances, it is classified as

• compound

• element

• mixture

• molecule

The elements hydrogen and oxygen can be combined to form water – H₂O. This illustrates that water is

• compound

• element

• mixture

• colloid

The chemical equation shown below represents a reaction that produces fuel for certain cars.

CO + H₂O ------> CO₂ + H₂

Which substance represented in the equation is classified as an element?

• CO₂

• H₂

• CO

• H₂O

Which of the following statements about elements and compounds is true?

• Compounds are made up of elements

• Elements can be shown with chemical symbols but compounds cannot

• Elements and compounds are the same thing

• Elements are made up of compounds

A(n) _______________________ cannot be broken down into any other substance.

• mixture

• atom

• element

• compound

All matter is made of

• electrons

• protons

• neutrons

• atoms

Tags

NGSS.MS-PS1-1

What is the chemical symbol for Lithium?

• H
• He
• Li
• N

Tags

NGSS.HS-PS1-1

Which of the following is NOT a compound?

• NaCl

• CO₂

• H₂O

• O₂