Chemical Reactions
In a chemical reaction the substances to the right of the arrow are called this/these?
What is/are products?
What does the arrow in a chemical equation mean?
A chemical reaction occurs in that direction
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
When balancing an equation, these numbers can not be changed.
subscript
The weighted average of masses of all naturally occurring isotopes
The atomic mass
What does an atom of the element with atomic number 6 always have?
6 protons
How are elements arranged in the periodic table?
By increase in the atomic number.
Horizontally in periods
Vertically in groups
Balance the Equation
P4 + O2 → P4O6
P4 +3 O2 → P4O6
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
Atoms are made up of smaller particles called subatomic particles. Which is a subatomic particles that has no charge:
Neutrons
State the Law of Conservation of Mass.
matter can not be created nor destroyed, just rearranged
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
Balance the equation
Al + O2 → Al2O3
4 Al + 3 O2 → 2 Al2O3
What do we call the elements on the right side of the periodic table?
Nonmetals
What is it called when both sides of a chemical equation do not have equal numbers of each element?
unbalanced
How many oxygen are in Al2(SO4)3
14
The elements to the left of the zigzag line.
Metals
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
The compounds that are poor conductors of electricity and have low melting and boiling points.
Covalent compounds
The compounds that are solid only, have high melting and boiling points and conduct electricity when dissolved in water.
Ionic compounds