Vocabulary
This is a measure of how much matter is present in a substance.
Mass
According to the law of conservation of mass, matter is neither ___ nor ___.
Created, Destroyed
Covalent compounds form when atoms combine by doing this with electrons.
Share
In a chemical equation, the reactants are written on this side.
Left
In the equation 2H₂ + O₂ → 2H₂O, how many hydrogen atoms are on the left side?
4
The law that states matter (or mass) cannot be created or destroyed, only changed in form.
Law of conservation of mass
The mass of the reactants must equal the mass of the ___.
Products
Ionic compounds form when atoms are held together by doing this with electrons.
Transferring/Stealing
The products are written on this side of a chemical equation.
Right
In the equation 2H₂ + O₂ → 2H₂O , how many oxygen atoms are on the right side?
A number placed in front of a chemical symbol or formula to balance an equation.
Coefficient
toms are not created or destroyed in a chemical reaction; instead, they are ___.
Rearranged
Covalent compounds form___
molecules
Numbers written below and to the right of chemical symbols, showing the number of atoms present.
Subscript
Is the equation H₂ + O₂ → H₂O balanced?
No
A group of atoms of different elements joined together by sharing or transferring electrons.
Compound
Why doesn’t the mass change during a chemical reaction?
Because the atoms are just rearranged
Ionic compounds form
Formula units
A number placed in front of a chemical symbol or formula to balance an equation.
Coefficient
In equation H₂ + O₂ → H₂O what coefficient needs to be added where to fix it?
2 to H2O
This type of compound forms when atoms are held together by transferring electrons.
Covalent
Burning wood demonstrates conservation of mass because the total mass of smoke and ashes (reactants) equals the total mass of the
The total mass of the wood and oxygen
BONUS: When you have an ionic compound, how do the two elements stick together even though they are not technically touching or sharing electrons?
Positive and negative charges
In a balanced chemical equation, the number of each type of atom on the reactant side must equal ...
The same as the products
In equation H₂ + O₂ → 2H₂O what coefficient needs to be added where to fix it?
2 to O2