4_Physical/Chemical Properties

Question 1

Physical Properties

Answer 1

Describes the characteristics of a substance.

Can be determined w/o changing its composition

Question 2

What is the difference between qualitative physical properties and quantitative physical properties?

Answer 2

Qualitative- descriptive

Quantitative- measurable

Question 3

Define lustre, clarity, brittleness, malleability, ductility, hardness, and solubility. Identify whether they are qualitative or quantitative properties.

Answer 3

Lustre- ability to reflect light | quality
Clarity- transparency | quality
Brittleness- ability to break/shatter | quality
Malleability- ability for a metal to hammered into a sheet | quality
Ductility- ability to be stretched | quality
Hardness- how much a substance can resist scratches/dents | quantity
Solubility- ability to dilute/dissolve in a solvent

Question 4

Density Formula

Answer 4

d = mass/volume

Question 5

Chemical Property

Answer 5

A substance’s ability undergo change in composition, producing 1 or more new substances.

Question 6

Identify and define the 6 chemical properties.

Answer 6

1. reactivity w water - ability to react to water
2. reactivity w oxygen - ability to reach to oxygen (e.g. rust over long periods of exposure)
3. reactivity w acid
4. combustibility - ability to burn in air 5. stability - ability to remain unchanged
5. toxicity - ability to cause harm to plants and animals