Unit 4 test

What is the oxidation number for Oxygen?

• +1

• -1

• +2

• -2

The total number of oxygen atoms in the compound K₃PO₄ is:

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

The chemical formula for acetic acid is HC₂H₃O₂. How many atoms of hydrogen are there?

• 1

• 3

• 4

• 5

Tags

NGSS.MS-PS1-1

Which of the following is ordered from smallest to largest?

• Compound, element, atom

• Element, atom, compound

• Atom, compound, element

• Atom, element, compound

Elements located in group 2 of the periodic table have an oxidation number of

• +1

• +2

• -1

• -2

A negative ion due to the gaining of one or more electrons during bonding is a:

• Anion

• Cation

• Oxidation number

• Coefficient

An element has a stable configuration when:

• Its first energy level is half-full

• Its outermost energy level has six electrons

• Its outermost energy level is full

• Its first energy level has eight electrons

Elements in the same group or family have _____________.

• the same number of valence electrons and different properties.

• the same number of valence electrons and similar properties

• different number of valence electrons and similar properties.

• different number of valence electrons and different properties.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

The atomic number tells you what?

• number of electrons
• number of protons
• number of neutrons
• both electrons and protons in an atom.

What is the right part of a chemical equation called...
2H_{2 +} O₂ --> 2H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

Tags

NGSS.MS-PS1-5