Atoms, Elements and Chemical Formulas

What is the chemical formula for Carbon Dioxide?

• C6H12O6
• CO2
• C5Ca15O2
• None of the above

Tags

NGSS.MS-PS1-1

The symbol "Cu" is what element?

• Copper
• Chromium
• Cobalt
• Carbon

Pure substances that are composed of two or more atoms that are chemically combined are called:

• Elements
• Compounds
• Subscripts
• None of the above

Compounds can only be changed into simpler substances called elements by chemical changes

• True
• False
• Kermit has big pawsies

What is the symbol for the element Calcium?

• Cl
• C
• Ca
• Cs

Subscripts show how many of each kind of atom and is written to the lower right of the element symbol.  If no subscript is written, what does that mean?

• Only 1 atom of that element is part of the compound
• 2 atoms of that element are part of the compound
• Kermit has small pawsies
• Kitty (Kiki) is a mean cat

How many atoms and are in the chemical formula for water; H₂O (H2O)?

• 2 atoms for Hydrogen; 1 atom for Oxygen
• 2 atoms for Hydrogen; 2 atoms for Oxygen
• 1 atom for Hydrogen; 1 atom for Oxygen
• None of the above

Tags

NGSS.MS-PS1-1

The symbol "N" is what element?

• Nobelium
• Nitrogen
• Nihonium
• Neptunium

What is the common name for the following chemical formula? Fe2O3

• Copper
• Aluminium
• Rust
• None of the above

Which of the following are correct examples of compounds?

• water, air, sugar
• oxygen, sugar, water
• water, salt, air
• water, salt, sugar

Tags

NGSS.MS-PS1-1