What is the definition of a scientific theory?
a model that explains the underlying reasons for observations and laws
What term best describes a brief statement that summarizes many past
observations and predicts new ones?
scientific law
Which of the following is an example of a scientific law?
In a chemical reaction, matter is neither created nor destroyed.
Which of the following would be considered a theory?
Helium balloons float because helium is less dense than air.
The key to success in chemistry is:
all of the above
A plastic block has dimensions of 2.2 cm x 3.0 cm x 1.5 cm and a mass of 12.4
grams. Will the block float in water and why?
No, because the density of the block is 1.3 g/mL which is greater than the density of
water.