District Test

Question 1

STP

Answer 1

0ºC
1atm
22.4L = 1mol

Question 2

Empirical Formula

Answer 2

Reduced version of the molecular formula

Question 3

KMT

Answer 3

-Gas particles are in constant random motion
-Negligible (very small) particle volume
-No intermolecular forces (no attractive or repulsive forces on each other, except collisions)
-Perfectly elastic collisions
-Average kinetic energy in proportional to temperature

Question 4

Intramolecular

Answer 4

forces that hold atoms together within a molecule

Question 5

Intermolecular

Answer 5

forces that exist between molecules

Question 6

Exothermic Reactions

Answer 6

Releases energy in form of heat
(acids + alkalis)
(water + calcium oxide)
(respiration)
(freezing)
(condensation)
(negative delta H)
energy of products is lower than energy of reactants

Question 7

Endothermic Reactions

Answer 7

Absorbs energy in form of heat
(electrolysis)
(sodium carbonate + ethanoic acid)
(photosynthesis)
(melting)
(boiling)
(positive delta H)
energy of products is higher than energy of reactants