Chemical Equations and Stoichiometry

What is a mole?

• A mole is a type of animal found in the ground.
• A mole is a skin growth caused by sun exposure.
• A mole is a measurement of temperature in chemistry.
• A convenient unit used to convert between amounts of a substance in grams and numbers of atoms or molecules.

What is Avgrado's number?

• 6.022 x 10^22
• 6.022 x 10^23
• 3.14159 x 10^23
• 1.602 x 10^19

Tags

NGSS.HS-PS1-7

How do you get a balanced equation

• By making sure the number of atoms in the equation are the same and the mass is not conserved

• By switching each atom of each element until it seems right

• By making sure the mass is conserved and there are equal numbers of atoms of each element on both sides of the equation.

• By making sure the numbers of atoms are not the same but the mass stays conserved

Tags

NGSS.HS-PS1-7

What is Stoichiometry?

• Stoichiometry refers to the measurement of temperature in reactions.
• Stoichiometry is the analysis of sound waves in chemistry.
• Stoichiometry is the study of animal behavior.
• Stoichiometry is the quantitative relationship among reactants and products.

Tags

NGSS.HS-PS1-7

What is "Molarity

• Molarity is defined as moles of solute per liter of solution.
• Molarity is the mass of solute per volume of solution.
• Molarity is the number of molecules in a solution.
• Molarity is the concentration of a gas in a liquid.

Tags

NGSS.HS-PS1-5

Balance the equation:

N2 + H2 --> NH3

Answer explanation

you have 3 hydrogen and 2 on the other, to make it even you multiply the one with 3 atoms by 2 and the one with 2 atoms by three, but now you have 2 nitrogen but the other nitrogen already has 2 so you don't change a thing.

Balance this equation:

K + Cl2 --> KCl

Answer explanation

To make the Cl with zero atoms equal to the other Cl with 2 atoms, you multiply KCl by 2, but now you have a K with 2 atoms so you multiply the K with other atoms by 2

Balance this equation:

P4 + O2 --> P203

Answer explanation

To balance this equation you first try to make both of the oxygen's (O) equal, so you multiply the O with 2 atoms by 3, which makes it six, now the other with 3 atoms multiply it by 2, so now the Oxygen's are equal and both P's equal 4

Balance this equation:

CH4 + O2 --> CO2 + H2O

Answer explanation

To balance this equation you have to know that the products side has 2 Oxygen atoms which add up. So first the reactant side oxygen has 4 atoms, and the product side's oxygen has 2 so multiply the product side's oxygen by 2 so now both sides have equal hydrogen. but the products side has 4 oxygen now, so multiply the reactants oxygen side by 2.

GaF3 + Cs --> CsF + Ga

Answer explanation

To balance this equation you have to mulitply the products side which by three since you have to equal the (F) to the reactants side which has 3 atoms, so you multiply it by 3 and now the products side (Cs) has 3 atoms so multiply the reactants (Cs0 by 3.