Question: A description of an event that actually occurs in the physical world.

Answer: observation

Question: A law is based on observation, and need have no explanation.

Answer: true

Question: A unifying explanation of observed behaviors, consistent with many laws or successfully tested hypotheses.

Answer: theory

Question: It has been noted since the middle of the last century that as fossil fuel CO2 emissions increased, the annual mean surface temperature of the Earth increased. Based on this information, classify the following statement. The combustion of fossil fuels is a cause of global warming.

Answer: hypothesis

Question: When the mass of helium in a piston at 25 °C and 1 atm, was increased from 0.070 grams to 0.140 grams, the volume of the piston increased from 0.428 L to 0.856 L.

Answer: observation

Question: Classify each of the following as either macroscopic, microscopic or particulate:

a snow ball

Answer: macroscopic

Question:

Answer:

Question: Classify each of the following as either macroscopic, microscopic or particulate:

salt

Answer: macroscopic

Question: Classify each of the following as either macroscopic, microscopic or particulate:

an iron atom

Answer: particulate

Question: Classify each of the following as either macroscopic, microscopic or particulate:

a four leaf clover

Answer: macroscopic