Chemical Reactions
What is the Reactant of the chemical equation and where is it located?
The reactant is the substance that undergoes change and it is located on the left side of the equation.
Balance a chemical equation when sulfur and oxygen react to form sulfur trioxide.
2S + 3O2 --> 2SO3
Because of the law of conservation of mass, the mass of the products ______________ the mass of the reactants.
equals
The mass of one mole of a substance is called...
...molar mass!
What is the Product of a chemical equation and where is it located?
The product is the new substance that forms. It is located on the right side of the equation.
This is the force that holds an atom together?
a chemical bond
What is the the number that appear before the formula in a chemical equation? *You change this number when balancing
Coefficients
How many grams of HNO3 are in 1 mol of the compound? In 2.6 mol?
63 grams, 163.8 grams
Identify the reactants and products in the following chemical equation: H2 + NaCl ---> H2Na + Cl
Reactants: H2, NaCl Products: H2Na, Cl
Twelve grams of reactant X react with fifteen grams of reactant Y. What is the total mass of the products?
Twenty seven grams??
Within a chemical formula, if you don't see a subscript, you can conclude that there are how many atoms of that element within each molecule.
One
How many grams in 1 mol of Cr? How many moles of Cr are in 156 g of the element?
52.00 grams, 3 mol
What does the law of conservation of mass states?
The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.
What is a mole?
it measures the amount of a substance. A substance can be a single atom or compound
How many atoms does each element have on the reactant/product side of the chemical equation: NaOH + H2CO3 ---> Na2CO3 + H2O *Note - All the numbers are subscripts
Reactant - 1Na, 4O, 3H, 1C Product - 2Na, 1C, 4O, 2H
2C4H10 + 13O2 --> 10H2O + 8CO2. If 3 mol of c4h10 burn, _______ mol of carbon dioxide are produced.
12 mol
What is the meaning of a subscript? Give an example!
number of atoms of an element in a compound. H₂O: the subscript "2" tells you there are two hydrogen atoms for every oxygen atom in the molecule
The coefficients in a balanced chemical equation always can express the ratio of...
...moles of reactants and products!
Barium nitrate decomposes into solid barium oxide, diatomic nitrogen gas, and diatomic oxygen gas. Write the balanced chemical equation.
2Ba(NO3)2 →2BaO +2N2 +5O2
What is one reason that we balance chemical equations?
To validate that the Law of Conservation of Mass is true.
When iron metal reacts with oxygen, the reaction can form Fe2O3. Write a balanced chemical equation and find the number of moles of oxygen that are needed to form 3 mol of Fe2O3.
4Fe + 3O2 --> 2Fe2O3, 4.5 mol O2