Lesson 1
What is a physical property?
Characteristic that can be observed or measured without changing a substance
Define Density
Density is a measure of the mass of a material in a given volume
What are the 3 states of matter?
Solid, Liquid, and Gas
Is boiling point a physical or chemical property?
Physical Property
Write the chemical equation down. Label each side as either the product or the reactant.
2H2 + O2-> 2H2O
Reactant-> Product
What is a homogeneous mixture?
What is mass?
What is energy?
Energy is the ability to do work or cause change
Calculate the density of a dog that weighs 12 lbs and a volume of 34mL
Cannot find density using weight!
Is the following equation balanced? Why or why not?
H2-> 2H2
The equation is not balanced because there is more than one set of di-hydrogen on the product side, but on the reactant side there is only one set of dihydrogen
What is a chemical property?
Characteristics that describe a substance's ability to change into a different substance
What is volume?
Volume is the amount of space that matter occupies
What does the Law of Conservation state?
Matter cannot be created nor destroyed in any chemical or physical change.
Explain the difference between exothermic and endothermic reactions?
Endothermic reactions trap or absorb heat
Exothermic reactions release heat
What does temperature relate to? 2 ANSWERS MUST HAVE BOTH RIGHT
Motion and Energy
What is a heterogeneous mixture
A heterogeneous mixture is a mixture that you CAN see the different components of.
What is the density formula, and what does each letter stand for?
D=m/v
D is Density, M is mass, and V is Volume
Using this example, what is the difference between the 2 and the 5?
5H2O
5 is the coefficient, there are 5 sets of H2O. The 2 means that in one set, there are 2 hydrogen atoms and 1 oxygen atom
Why does wood float in water, but aluminum sinks to the bottom?
The density of wood is less than the density of water, but the density of aluminum is far greater than that of water
Calculate the density of an object that has a mass of 5g and a volume of 25mL
D=m/v
D=5/25
D=0.2g/mL
Describe the difference between a physical and chemical change
A physical change alters the appearance of a substance, while a chemical change alters the chemical composition of a substance, and in turn creates a whole new substance.
Why is it possible to weigh 100 lbs on Earth, but 253 lbs on Jupiter?
The force of gravity is different on different planets. Weight changes based on location
Why do we want to make sure chemical equations are balanced?
The Law of Conservation does not allow us to create nor destroy matter. If an equation is unbalanced, we either are creating too much, or getting rid of matter
Balance the following equation
H+ Cl2-> 3HCl2
Once you get your answer, simplify it
3H+3Cl2-> 3HCl2
H+Cl2-> HCl2
Balance the following equation
N2+H2-> NH3
N2+3H2-> 2NH3