Test Trace Evidence

Define trace evidence

• A characteristic that does not involve a change in the identity of a substance,

• A characteristic that determines how a substance will change into another substance

• physical evidence found in small amounts at a crime scene.

• physical evidence found at a scene that connects a single person to the scene

Check the items that are considered unusual trace evidence. (check 2 answers

• hair

• Ashes

• a spider

• fibers

Define physical properties

• A characteristic that does not involve a change in the identity of a substance,

• A characteristic that determines how a substance will change into another substance

• A chemical property the identity does not change when in a physical property it turns into a new substance.

• A chemical property the identity does not change when in a physical property it turns into a new substance.

Tags

NGSS.MS-PS1-4

Define chemical properties

• A characteristic that does not involve a change in the identity of a substance,

• A characteristic that determines how a substance will change into another substance

• A chemical property the identity does not change when in a physical property it turns into a new substance.

• A physical property the identity does not change when in a chemical property it turns into a new substance.

What is the diffference between chemical and physical properties.

• A characteristic that does not involve a change in the identity of a substance,

• A characteristic that determines how a substance will change into another substance

• A physical property the identity does not change when in a chemical property it turns into a new substance.

• A chemical property the identity does not change when in a physical property it turns into a new substance.

Check all the answers that are examples of physical properties. (check 2 answers)

• An new orance color is produce when chemicals react

• solubility

• microscopic examination

• A new gaas is produce

Tags

NGSS.MS-PS1-2

Check all the answers that are examples of chemical changes. (check 2 answers)

• An new orance color is produce when chemicals react

• solubility

• A new gas is produce

• microscopic examination

Tags

NGSS.MS-PS1-2

What is solubility?

• A physcial property that shows the ability of a substance to dissolve

• A chemical property that shows the ability of a substance to dissolve

• A physical property that determines how something is reactive

• A chemical property that determines how something is reactive.

Check all the answers that are chemical analysis of dissolved metals (check 3 answers)

• Separation by chromatography

• Specific reactions

• The solubility of the metal

• Comparison of Rf values to known metals

What is the difference between a qualitative and a quantitative analysis?

• A Qualitative analysis Uses the senses to describe while a quantative analysis uses mathematical models.

• A Qualitative analysis describes the quality while a quantative analysis descibes the Quantum physics of it.

• A Quantitative analysis Uses the senses to describe while a qualitative analysis uses mathematical models.

• A Qualitative analysis Uses the touch to describe while a quantative analysis uses only numbers.