Chemistry test Chapters 3 & 4 Flashcards
What is empirical formula for sugar fructose?
Q
Know mole ratio concept in equation
Q
If the empirical formula of a substance is know what additional information is needed to calculate the molecular formula?
Actual mass of substance
Know Nitrogen dioxide formula
Q
Know copper (I)hydroxide formula?
Q
Know calcium carbonate formula?
Q
Know polyatomic ions
Q
Know common ions charges
Q
Name polyatomic ions put together?
Q
Know and identify basic kinds of reactions.
Combination/synthesis reaction: a+b=ab
Decomposition: ab=a+b
Single displacement: a+bc=b+ac
Double displacement: ab+cd=ad+bc
What unit is equivalent to Avogadro’s number of objects?
1 mole
What is a set of symbols that tells how many of each type of atoms are found in a molecule?
Chemical formula
What is the sum of atomic masses of all atoms in a molecule?
Molecular mass
Know how to balance equations.
Q
Know how to find a molecular mass.
Add up atomic masses from periodic table of substance
Know how to find molar mass
Molar mass=1 mole
Molar mass is atomic mass on periodic table
Know how to calculate the percent composition of a substance.
Part/whole times 100
Know how to determine empirical formula of something
Q
Know how to determine moles and mass in grams
1 mole of substance is equal to its molar mass
1 mole is equal to 22.4 liters of substance
Understand the law of conservation of mass and how a chemist could use it to predict the formula of an unknown product.
Reactants=products
Mass is never destroyed in a reaction only redistributed a different way from reactant to product.
What is Avogadro’s number?
6.022times 10 to the 23rd power
