Scientific Method
What is the Scientific Method?
An organized approach to solve problems
Chemistry is the study of _______ and the changes it undergoes.
Matter
Define physical properties
Properties that can be measured or observed without changing the identity (or composition) of a substance
Define Accuracy
How close a measurement is to the true or accepted value
How many meters in 100 millimeters?
0.1 meters
How do you make an observation?
Use your senses (see, hear, touch, smell, taste)
Define mass
The amount of matter in an object.
Define a chemical change
One or more substances react to form new substances with different chemical and physical properties
Define Precision
How close multiple measurements are to each other
How many mg in .475 kg?
475,000 mg
What is a hypothesis?
In which state (solid, liquid, or gas) is an element most dense?
Solid
Freezing is a _______ change.
physical
Put 345,000,000 into scientific notation.
3.45 x 108
How many hours in 80 minutes?
1.33 hours
What is a scientific law?
A natural phenomenon which has been tested over a long period of time under different conditions.
Matter is classified into mixtures and ____ __________.
pure substances
Give 2 examples of a chemical change.
Rusting, burning, corrosion, digestion, respiration, decaying, etc...
Put 1.89 x 10-5 into standard notation.
0.0000189
How many inches in 100 yards?
3,600 inches
Name the steps of the scientific method in order.
1. Observe
2. Hypotheses
3. Experiment
4. Analysis
5. Conclusion
Mixtures can either be ___________ with a uniform composition or _____________ without a uniform composition.
homogeneous, heterogeneous
The Law of Conservation of Mass states...
In any chemical or physical change, matter cannot be created or destroyed.
Put 48,400,000/4,000 into scientific notation.
1.21 x 104
How many tons in 1,000 grams?
0.0011 tons