Chapter 10 General Chemistry Review

What is the maximum number of electrons that can be present in the second energy level of a Bohr diagram?

• 5

• 8

• 12

• 20

Balance the chemical equation: H2 + O2 -> H2O2

• H2 + O2 -> H2O2

• H2O2 -> H2 + O2

• H2O -> H2 + O2

• H2 + O2 -> 2H2O

Tags

NGSS.HS-PS1-7

Classify the following chemical reaction: 2H2 + O2 -> 2H2O

• Single displacement reaction

• Decomposition reaction

• Double displacement reaction

• Synthesis reaction

Identify the type of chemical reaction: 2Mg + O2 -> 2MgO

• Decomposition reaction

• Single displacement reaction

• Combination reaction

• Double displacement reaction

What is the type of chemical reaction: 2Na + Cl2 -> 2NaCl?

• Decomposition reaction

• Single displacement reaction

• Combination reaction

• Double displacement reaction

Balance the chemical equation: Fe + O2 -> Fe2O3

• Fe + O2 -> Fe2O3

• 2Fe + 3O2 -> 2Fe2O3

• 4Fe + 3O2 -> 2Fe2O3

• Fe + 3O2 -> 2Fe2O3

Tags

NGSS.HS-PS1-7

what's a valence electron ?

• the atomic number

• electrons in the first level

• electrons in the outermost energy level

• electrons in the second energy

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

ldentify this atom.

• Lithium

• Boron

• Carbon

• Neon

Tags

NGSS.HS-PS1-1

what is the atomic number of this atom

• 4

• 2

• 6

• none of the above

Tags

NGSS.HS-PS1-1

if an atom gains an electron , it becomes a ...... ion

• negative (anion)

• negative (cation)

• positive

• cation