Chemical Reactions
In a chemical reaction the substances to the right of the arrow are called this/these?
What is/are products?
What are the parts of a chemical reaction?
Reactants and products
What is the name of the group of elements in the column all the way to the right on the periodic table?
Noble Gases
When balancing an equation, these numbers can be changed.
a coefficent
What is it called when both sides of a chemical equation have equal numbers of each element?
Balanced
hydrogen + oxygen → water
What are the reactants in this chemical reaction?
hydrogen and oxygen
In the formula 5CO2, what does the 5 tell us?
That there are 5 molecules of CO2
How many Aluminum atoms do we have in the products?
Al + O2 → Al2O3
2
What do we call the elements on the left side of the periodic table?
Metals
What is it called when both sides of a chemical equation do not have equal numbers of each element?
unbalanced
How many Carbons are there in NaHCO₃?
1
What do we call this:
A + B → AB?
A chemical reaction
Is this a balanced or not balanced equation?
H2S + NaCl → HCl + Na2S
Not balanced
If 70 grams of sodium reacts wtih chlorine to form 100 grams of salt. How many grams of chlorine reacted?
30 grams.
State the Law of Conservation of Mass.
matter can not be created nor destroyed, just rearranged
When balancing an equation, these numbers can not be changed.
subscript
What two subatomic particles make up the mass of an atom?
Protons and neutrons
What is the law that states atoms and mass must be equal on both sides of a chemical equation?
The Law of Conservation of Mass
The element Florine has an atomic number of 9 and an atomic mass of 19. How many electrons does it have?
9. Same as the number of protons. (Atomic number)
What is wrong with this equation?
C2H4 + H2O → CH4S2O
There is no S in the reactants
How many oxygen are in 2C6H8O7
14
What is the name of the elements on the "staircase" of the periodic table?
Metaloids.
Name two things that indicate that a chemical reaction has occured.
Change in temperature, change in color, change in smell, formation of a precipitate, production of a gas, production of light.
A subscript tells you how many __________ there are in a compound.
atoms
A _______________ tells you how many molecules there are of a compound.
Coefficient