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
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
The atomic mass (how many protons and neutron's are in that element)
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
Why did the rust form in the water of Westfield?
The iron from the pipes and the fertilizer reacted with each other. This rearranged their molecules to form the new substance called "Rust"
How is the microscale different than the macroscale?
microscale = cannot see with your eyes
macroscale = you can see with your eyes
What element has the symbol, or the abbreviation, "W"?
Tungsten
Is this equaction a balanced or not balanced chemical equation?
P4 + O2 → P4O6
Not balanced
How many oxygen are in 2C6H8O7
14
The atomic number for an element is at the top of the box for that element on the periodic table. What element has the atomic number 83?
Bismuth
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
How is phase change different from a chemical reaction?
During phase change the atoms only change their freedom of movement.
During chemical reactions the atoms rearrange to form new substances.