Spring Final Practice Test

Balance the chemical equation: Mg + O2 ---> MgO

• 2Mg + O₂ ---> MgO
• 2Mg + O₂ ---> 2MgO
• 4Mg + O ---> MgO
• already balanced

Tags

NGSS.HS-PS1-7

The magnesium atom has _____ valence electrons and its ion is written ________.

• 2 valence electrons; Mg²-
• 2 valence electrons; Mg²+
• 12 valence electrons, Mg²+
• 8 valence electrons, Mg⁸+

Tags

NGSS.HS-PS1-1

The formula for ammonium chromate is:

• (NH₄)₂CrO₄
• NH₄CrO₄
• NH₄(CrO4)₂
• NH₄(CrO4)₄

Balance equation: Al + Pb(NO₃)₂ ---> Al(NO₃)₃ + Pb

• 2Al + Pb(NO₃)₂ ---> Al(NO₃)₃ + Pb
• 2Al + 2Pb(NO₃)₂ ---> 2Al(NO₃)₃ + 2Pb
• 2Al + 3Pb(NO₃)₂ ---> 2Al(NO₃)₃ + 3Pb
• already balanced

Tags

NGSS.HS-PS1-7

Breaking bonds

• requires energy
• releases energy

Tags

NGSS.HS-PS1-4

Forming bonds

• requires energy
• releases energy

Tags

NGSS.HS-PS1-4

As an object is heated, the particles within that object

• speed up
• slow down
• stay the same

Tags

NGSS.HS-PS3-2

If an object loses kinetic energy, its temperature

• increases
• decreases
• stays the same

A system that gains (absorbed) heat energy is considered

• endothermic
• exothermic

Tags

NGSS.HS-PS1-4

A system that loses heat energy is considered

• endothermic
• exothermic

Tags

NGSS.HS-PS3-4