General Chemistry Chapter 1

Classify each statement as an observation, a law, or a theory. If elements are listed in order of increasing mass of their atoms, their chemical reactivity follows a repeating pattern.

Law

Classify each statement as an observation, a law, or a theory. Chlorine is a highly reactive gas

Observation

Classify the property as physical or chemical. Bluish color

Physical

Classify the property as physical or chemical. Gas at room temperature

Physical

Classify the property as physical or chemical. Pungent odor

Physical

Convert 2.735 K to ∘C (average temperature of the universe as measured from background blackbody radiation).

T = -270.42 ∘C C= K - 273.15

Convert 0.00 K to ∘F (coldest temperature possible, also known as absolute zero).

T = -459.67 ∘F The Kelvin and Fahrenheit scales do not have a direct conversion. First convert to ∘C, then convert ∘C to ∘F.

Convert 212 ∘F to ∘C (temperature of boiling water at sea level).

T = 100 ∘C F - 32 / 1.8

Convert 25 ∘C to K (approximate room temperature).

T = 298 K K= C + 273.15

Classify the property as physical or chemical. Colorless

physical

Classify the property as physical or chemical. Liquid at room temperature

physical

Classify the property as physical or chemical. Mixes with water

physical

Classify the property as physical or chemical. density = 0.79 g/mL

physical

Tripartite

consisting of three parts

Classify the property as physical or chemical. Decomposes on exposure to ultraviolet light

Chemical

Classify the property as physical or chemical. Flammable

Chemical

Classify the property as physical or chemical. Very reactive

Chemical

Classify each statement as an observation, a law, or a theory. The reactivity of elements depends on the arrangement of their electrons.

Theory