Chemical Reactions
In a chemical reaction the substances to the right of the arrow are called this/these?
What is/are products?
A _________________ portrays a chemical reaction taking place with the reactants recombining into the products.
chemical equation
A substance that enters a chemical reaction is called this.
a reactant
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
Where are the reactants and products in this chemical reaction?
Reactants: hydrogen and oxygen
Products: Water
In the formula 5CaSO4,how many oxygen atoms do we have?
20
How many Aluminum atoms do we have in the products?
Al + O2 → Al2O3
2
This type of change occurs when a substance or multiple substances rearrange, in which a new substance is created.
chemical change
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
Balance the following chemical reaction:
H2 + NaCl --> HCl + Na
H2 + 2NaCl --> 2HCl + 2Na
Is this a balanced or not balanced equation?
H2S + NaCl → HCl + Na2S
Not balanced
H2S + 2NaCl → 2HCl + Na2S
In the formula 5CaSO4, this is the number of oxygen atoms.
20
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
2 of the same atoms bonded in one molecule is called
Diatomic
The abbreviations in parentheses in a chemical equation represent
states of matter
Give three examples of details showing that a chemical change has taken place.
What is temp. change, color change, odor change, formation of a precipitate, formation of a gas?
Is this equation a balanced or not balanced chemical equation?
P4 + O2 → P4O6
Not balanced
P4 + 3O2 → P4O6
How many oxygen are in 2C6H8O7
14
Balance the following equation:
NH4NO3 ---> N2O + H2O
NH4NO3 ---> N2O + 2 H2O
All of the following are examples of chemical change except:
Increase in temperature, release of light, formation of a solid, melting of ice
melting of ice
Name 3 types of chemical reactions.
any of the following:
combustion, synthesis, decomposition, double replacement, single replacement
Which compounds are found only to be diatomic in nature?
H2, N2, O2, F2, Cl2, Br2, I2