Forensics Ch 15 Test Review

True or False Glass is a hard, amorphous material made by melting silicon dioxide, calcium oxide, and sodium oxide at very high temperatures.

• True
• False

True or False: The primary ingredient of glass is carbon dioxide.

• True
• False

True or False: Glass is called an amorphous solid because its atoms are arranged in a random fashion.

• True
• False

True or False: Fine glassware and decorative art glass, called crystal or leaded glass, contain lead oxide rather than calcium oxide.

• True
• False

True or False: Each type of glass has a density that is specific to that glass. One method of matching glass fragments is by a density comparison.

• True
• False

Density of glass is calculated by dividing the:

• asubstance of a mass by its volume
• mass of a substance by its volume.
• volume of a mass by its substance
• volume of a substance by its mass.

The refractive index is a measure of how light bends as it passes through:

• one substance into another
• two or more substances
• three or more substance
• four or more substances
• None of these choices

Tags

NGSS.MS-PS4-2

Refractive index comparisons result in circumstantial class evidence and:

• can confirm guilt.
• cannot to confirm guilt.
• only provides meaningful results for window glass or television glass.
• only provides meaningful results for quartz glass or leaded glass.

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Light travels:

• nearly as fast through air as it does through a vacuum.
• nearly as fast through a vacuum as it does through air.
• at the same speed in both air and water.
• at the same speed in methanol and clove oil.
• in a way that varies on a case-by-case basis based on environmental factors.

Tags

NGSS.MS-PS4-2

The speed of an object when it hits a piece of glass influences the number and location of concentric circles in the fracture pattern. An object moving at high speed upon impact, such as the bullet, produces:

• concentric circles with wide margins.
• concentric circles with narrow margins.
• tighter concentric circles.
• widely spaced concentric circles

Tags

NGSS.MS-PS3-1

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