Endothermic vs Exothermic
temperature of the water increases
Exothermic.
Which has the lower thermal energy - 500 g of water at 20C or 500 g of water at 30C
500g of water at 20C
What Type of Reaction is this: Synthesis, Decomposition, Single Replacement, Double Replacement, or Combustion?
__ H2 + __Cl2 --> __HCl
Synthesis
If the volume of a gas is halved, what happens to the pressure?
It doubles.
Calcium carbonate undergoes a reaction to form calcium oxide and carbon dioxide. The heat of reaction is - 18 kJ/mol
2) Name the type of reaction
3) Identify it as Endothermic or Exothermic
Decomposition
Exothermic
Burning a candle.
Exothermic.
The process of changing from a solid directly to a gas is called...
sublimation
What Type of Reaction is this: Synthesis, Decomposition, Single Replacement, Double Replacement, or Combustion?
___ NH3 → __N2 + __H2
Decomposition
If the number of particles of gas in a container doubles, what happens to the pressure?
Products are higher in energy than reactants
Endothermic.
What type of energy increases when boiling water?
potential energy
What Type of Reaction is this: Synthesis, Decomposition, Single / Double Replacement, or Combustion?
_C4H8 + _O2 -->_CO2 + _H2O
Combustion
The temperature of a gas is lowered, what happens to the volume if pressure is constant?
It will decrease.
Freezing a substance
Exothermic
At a given temperature, the temperature value is a measure of the ....
Average kinetic energy
What Type of Reaction is this: Synthesis, Decomposition, Single Replacement, Double Replacement, or Combustion?
___ Al + ___ CuSO4→ ___ Al2(SO4)3 + ___ Cu
Single Replacement
What happens to the volume of a bubble underwater as it rises to the surface?
The volume increases
Heat of the reaction is +38 Joules
Endothermic.
How many joules of heat is absorbed to heat 100 g of water from 20 to 30 C? (c water = 4.184 J/gC)
4,184 J
What Type of Reaction is this: Synthesis, Decomposition, Single Replacement, Double Replacement, or Combustion?
___ Ca (NO3)2 + ___ H2O → ___ Ca(OH)2 + ___ HNO2
Double Replacement
What is the formula to solve for a new pressure if temperature and volume are changing?
P2 = P1V1T2 / T1V2