Chemical Equations
These are the products of the following reaction:
Na + H2O --> NaOH + H2
NaOH and H2
How many particles are in one mole?
6.02x1023
A + B --> AB
Synthesis
Define "reaction rate"
The speed it takes for a reaction to occur
The energy required to start a chemical reaction?
Activation Energy
According to the following equation, this substance is a liquid:
NaBr(s) + F2(g) --> NaF(s) + Br2(l)
Br2 or Bromine
what is the molar mass of silicon? Round to the nearest whole number
28 g/mol
CaCO3 --> CaO + CO2
Decomposition
What happens to reaction rate if the temperature increases?
it increases (speeds up)
What happens to energy when bonds are formed during a chemical reaction
It is released
According to the following equation, this substance is a precipitate:
NaCl(aq) + AgNO3(aq) --> AgCl(s) + NaNO3(aq)
AgCl
If you react 2 moles of lithium, how many moles of lithium oxide will be created?
4Li + O2 --> 2Li2O
1 mole
Two positive ions switch places and create two new ionic compounds
Double replacement
What does an inhibitor do?
Decreases reaction rate (makes it go slower)
This word describes a reaction which absorbs HEAT
endothermic
Write the skeleton equation for the following reaction:Magnesium reacts with oxygen and produces magnesium oxide
Mg + O2 --> MgO
What is the mass of 3 moles of phosphorus? Round your answer to the nearest whole number
93 g
Cl2 + LiBr --> Br2 + LiCl
Single replacement
You react oxygen and hydrogen gas at 1 atm of pressure. What will happen to the reaction rate if the pressure is increased to 1.5 atm?
Reaction rate will increase
The temperature of a reaction goes up. What word best described this reaction?
Exothermic (or exergonic)
Balance the following skeleton equation:
__Pb3(PO4)2 + __HF --> __PbF2 + __H3PO4
1, 6, 3, 2
5 moles
Fe + O2 --> Fe2O3
Synthesis AND combustion
NaCl and Pb(NO3) react when they are dissolved in water. You obtain 3 g of each, and react them in 100 mL of water. What will happen to the time it takes for the reaction to finish if you repeat the experiment with only 50 mL of water?
The time it takes for the reaction to finish will decrease
Describe the difference between exergonic and exothermic reactions
Exergonic= energy is released
Exothermic=heat is released