Observing Chemical Change
These are broken and formed between atoms during a chemical reaction.
What are chemical bonds?
In the formula 5Al2(SO4)3, this is the number of oxygen atoms.
What is 60?
The number of particles in a mole of something.
What is 6.022x10^23 particles.
(Avogadro's number)
These may not be changed when balancing chemical equations, as this would change the chemical.
What are subscripts?
Number of grams of N2 gas in 44.8 liters at STP.
What is 56 g of N2 gas?
Reaction type when two elements combine to form a compound (more complex substance) - i.e., A+ B --> AB
What is a synthesis reaction?
The substances located to the left of the arrow in a chemical equation.
What are reactants?
The molar mass of niobium (Nb).
What is 92.9 g/mol?
The coefficients that would balance this equation.
___H2 + ___Cl2 --> ___HCl
What is 1, 1, 2?
Use the following equation:
3 H2 + 2 N2 → 2 NH3
How much ammonia gas can be made from 7.2 moles of hydrogen gas?
What is 4.8 moles of ammonia?
Reaction type where a compound breaks down into smaller products - i.e., AB --> A + B
What is decomposition?
What do the coefficients represent in a chemical reaction?
2 Na + Cl2 --> 2 NaCl
What is how many moles there are of each reactant and product?
The mass of 1 mole of Ca(OH)2.
What is 74.09 grams per mole?
Fill in the missing coefficients:
__C2H4O2 + __O2 --> __CO2 + __H2O
What are 1, 2, 2, 2?
When aluminum is burned in excess O2, aluminum oxide is produced. How many grams of O2 are required to produce 0.75 moles of Al2O3?
What is 36 g O2?
When carbon dioxide and water are the products and the reactants include a fuel plus oxygen, this type of chemical reaction is occurring.
What is combustion?
What is exothermic?
The number of atoms in 0.42 moles of tin.
What is 2.536 x 10^23 atoms?
Find the missing coefficients:
__AgI + __Fe2(CO3)3 --> __FeI3 + __Ag2CO3
What are 6, 1, 2, 3?
Use the following equation:
3 H2 + 2 N2 → 2 NH3
How much hydrogen gas is required to make 7.2 moles of ammonia?
What are 10.8 moles of hydrogen gas?
What type of chemical reaction is this?
BaCl2 (aq) + Na2SO4 (aq)→BaSO4 (s) + 2 NaCl (aq)
What is a double replacement reaction?
Explain why it is necessary to balance chemical equations.
What is because the Law of Conservation of Matter (or Mass) states that in a chemical reaction matter cannot be created or destroyed?
I have to weigh out exactly 2.5 moles of ZnCl2. How many grams will I weigh out?
What is 340.75 g of ZnCl2?
(molar mass = 136.30 g/mol)
Find the missing coefficients:
__H2SO4 + __Al(OH)3 --> __Al2(SO4)3 + __H2O
What are 3, 2, 1, 6?
As an example, consider the balanced chemical equation
Given the following balanced equation:
Fe2O3+3SO3→Fe2(SO4)3
If we have 3.59 mol of Fe2O3, how many grams of SO3 can react with it?
What is 862 g SO3?