Scientists and Theories
Balancing Equations
Vocabulary
Molecular Mass
Volume Ratio
100

This Scientist had the hypothesis that "the atoms of elements in the gas phase combined together to form molecules."

Who is Avogadro?

100
Balance the following equation: _____N2 + ______ H2 ---> ______ NH3
What is N2 + 3H2 ---> 2NH3
100
Molecules that are composed of of two like atoms.
What are diatomic molecules?
100
The molecular mass of H2O - show your work.
What is 18.0? 1.0 + 1.0 + 16.0
100

2L Hydrogen + 2L Chlorine ---> 4L Hydrogen Chloride What is the volume ratio of hydrogen to chlorine?

What is 1:1?

200

This Scientist developed a theory that described the existence and behavior of atoms.

Who is John Dalton?

200
This represents the number of atoms in a chemical equation.
What is the subscript?
200
Pure substances, made of only one type of atom.
What is an element?
200
The molecular mass of HBr - show your work.
What is 80.9? 1.0 + 79.9
200
2L Hydrogen + 2L Chlorine ---> 4L Hydrogen Chloride What is the volume ratio of chlorine to hydrogen chloride?
What is 1:2?
300

This scientist is given credit with being the FIRST to come up with the idea of atoms.

Who is Democritus?

300
Balance the following equation: _____HgO ---> _____Hg + _____O2
What is 2HgO---> 2Hg + O2?
300
Anything that goes into a chemical reaction.
What is a reactant?
300

The numbers you add together to calculate molecular mass.

What are the atomic masses of the elements in the molecule?

300
2L Hydrogen + 2L Chlorine ---> 4L Hydrogen Chloride What is the volume ratio of Hydrogen to Chlorine to Hydrogen Chloride?
What is 1:1:2?
400

This scientist was the first to use chemical formulas, subscripts and coefficients when writing equations.

Who is Berzelius?

400
This represents the number of molecules in a chemical reaction.
What is the coefficient?
400
A symbolic representation of a chemical reaction.
What is a chemical equation?
400

DAILY DOUBLE. What scientist came up with the concept of Relative Atomic Mass?

Who is William Prout?

400
What is the total volume of reactant? The total volume of products? The volume ratio of total reactants to total products?
What is 4L, 4L, 1:1?
500

DAILY DOUBLE. Name the statement. "Matter cannot be created or destroyed in a chemical reaction"

What is the Law of Conservation of Mass.

500
How many atoms of Nitrogen are in the reactants of the following balanced equation: 2 N2 + O2 ---> 2 N2O
What is 4 atoms of Nitrogen?
500

The type of chemical reaction where two or more simpler substances combine to form a more complex substance.

What is synthesis?

500
What is the molecular mass of CH4? Show your work.
What is 16.0? 12.0 + 1.0 + 1.0 +1.0 +1.0 = 16.0
500
2L Hydrogen + 2L Chlorine ---> 4L Hydrogen Chloride Use Berzelius' symbols for the equation. Remember how many atoms are in each molecule.
What is H2 + Cl2 ---> 2 HCl?
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