How Can I Smell Things From a Distance - Learning Set #2 Review

Which of the following is NOT a property for identifying a substance? (Boiling Point, Freezing Point, Emission Spectra, Mass)

• Boiling Point

• Freezing Point

• Emission Spectra

• Mass

A_________________ is a characteristic that describes a material.

• attribute

• property

• feature

• aspect

List three properties used to identify substances.

• Boiling Point, Freezing Point, Emission Spectra

• Density, Color, Solubility

• Mass, Volume, Temperature

• pH, Conductivity, Viscosity

Why is mass not a unique property for identifying substances?

• Mass is always constant regardless of the amount of substance.

• Mass can vary with the amount of substance present, while other properties like boiling point are constant.

• Mass is the only property that can identify a substance uniquely.

• Mass is not measurable in a laboratory setting.

What percentage of the air is Nitrogen Gas?

• 70%

• 75%

• 78%

• 80%

What is a property in scientific terms?

• A characteristic or trait that can be used to identify a substance.

• A measurement of the mass of an object.

• A type of chemical reaction that occurs in a substance.

• A method of calculating the volume of a liquid.

What role does air play in the process of smelling things from a distance?

• Air has no role in smelling from a distance.

• Air carries sound waves that help us smell.

• Air carries odor molecules from their source to our noses, allowing us to detect smells.

• Air filters out unpleasant odors before they reach our noses.

What is the primary gas in the Earth's atmosphere?

• Oxygen (21%)

• Carbon Dioxide (0.04%)

• Nitrogen (78%)

• Argon (0.93%)

What does 'emission spectra' refer to?

• The spectrum of light emitted by a substance when it is heated or energized.

• The range of wavelengths of light absorbed by a substance.

• The colors of light reflected by a substance under white light.

• The spectrum of light that is transmitted through a substance.

What is the difference between an atom and a molecule?

• An atom is the smallest unit of an element, while a molecule is a group of two or more atoms bonded together.

• An atom is a group of two or more molecules, while a molecule is a single unit of an element.

• An atom can exist independently, while a molecule cannot exist without an atom.

• An atom is larger than a molecule, which is made up of smaller particles.