Vocabulary that Matters
When one or more substances are changed into new substances with new properties this is called a _________ __________.
chemical reaction
In chemical reactions the -> symbol stands for this.
What is yields?
This number is determined by the charge of an element's ion and can not change when balancing equations. It helps you write the chemical formula correctly.
What is Subscript
If there is one product in your equation, then you have this type of reaction. Example C + O2 -----> CO2
What is a synthesis reaction?
________ reactions transfer electrons from a metal to a nonmetalloid, and __________ reactions allow for sharing of electrons.
What is ionic and covalent, respectfully.
When the number of atoms is equal on each side we say that the equation is this.
What is balanced?
What do the s, g, l, or aq represent in a chemical equation. Example: K(s) + O2(g) -------> K2O(s)
What is states of matter; aq represent aqueous which means dissolved in water.
These are used to help balance chemical equations. These #s can change as need to meet the law of conservation of mass
What are coefficients?
What type of reaction is 2H2O ----> 2H2 + O2
What is a decomposition reaction?
What type of compound are these? Choose ionic, covalent, or none.
K3P
SBr2
CaAr
Ionic
Covalent
None - can not react
The substances you start with in a chemical reaction are called the ___________.
What is Reactants
In the chemical reaction, Mg + O -> MgO, the compound MgO represents the _________.
product
Balance the following chemical equation. You must show all work and simplify your answer. Fe + O2 --> Fe2O3
4 Fe + 3O2 --> 2Fe2O3
A combustion reaction always needs _________ and ______ produces ________ and __________?
needs a hydrocarbon and oxygen and produces carbon dioxide and water
The term ____________ means that heat is released and ____________ means heat is absorbed
What is exothermic and endothermic, respectfully.
The substances that are made in a chemical reaction are called the ___________.
What is Products
Elements form compounds in order to get this many valence electrons .
What is called octet rule, 8 valence electrons unless you are H and He then it is 2 valence electrons.
Balance the following equation. You must show all work and simplify your answer! Li + Br2 --> LiBr
2Li + Br2 --> 2LiBr
If this is a double replacement - identify the products and write the formulas correctly:
MgO + NaCl -----> _____________________
What is Na2O + MgCl2
What type of reaction is this :
2Na + 2H2O --> 2NaOH + H2
single replacement reaction
A combination of symbols and numbers written out that show the chemical reaction is called a chemical ________.
What is an Equation
We must balance chemical equations in order to satisfy the Law of Conservation of _________.
Mass (aka atoms, or matter)
Write the following chemical formulas correctly:
NaO
MgF
BO
Na2O
MgF2
B2O3
When atoms in a replacement reaction switch places the + charged atom (metal) will always switch with the _______.
other metal (+ charged atom)
Name three of five indicators that signifies a chemical reaction has occured.
temperature change (endothermic or exothermic), light produced, gas produced (bubbles and/or odor), precipitant forms (solid within a liquid is produced), change in color, sound produced