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 two parts of a chemical reaction?
Reactants and products
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
How is CO different from CO2?
CO only has one C and one O atom
CO2 has one C atom and two O atoms
What is it called when both sides of a chemical equation do not have equal numbers of each element?
unbalanced
On the Periodic Table which element has the symbol Rf?
Rutherfordium
In the formula 6H2O, How many water molecules are present?
6
a pure substance made by chemically combining two or more elements; represented by a chemical formula
Compound
a mixture that is uniform throughout
Homogeneous Mixture
– a pure substance composed of the same type of atom throughout
Element
How many Carbons are there in NaHCO₃?
1
What do we call this:
A + B → AB?
A chemical reaction
On the Periodic Table which element has the symbol Au?
Gold
What element has the symbol, or the abbreviation, "W"?
Tungsten
State the Law of Conservation of Mass.
matter can not be created nor destroyed, just rearranged
How many oxygen are in 2C6H8O7
14
Is this a balanced or not balanced equation?
H2S + NaCl → HCl + Na2S
Not balanced
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
What two things can never happen to atoms in a chemical reactions?
Atoms cannot be created or destroyed in a chemical reaction
Is this equaction a balanced or not balanced chemical equation?
P4 + O2 → P4O6
Not balanced