Lesson 2: Unique Properties of Matter

Question 1

ability to reflect light on surface that gives the object a shiny appearance; common among metals and minerals

Answer 1

Luster

Question 2

opposite of lustrous; do not have the ability to reflect light on their surface so they do not have shiny appearance

Answer 2

Dullness

Question 3

ability of objects to be shaped easily by pressing/hammering into thin sheets w/o breaking; unique to metals

Answer 3

Malleability

Question 4

most malleable metal?

Answer 4

gold (Au)

Question 5

ability of objects to be shaped easily by pressing or hammering into thin wire or thread w/o breaking; unique to metals

Answer 5

Ductility

Question 6

get easily broken or shatter when applied w/ stress

Answer 6

Brittleness

Question 7

what usually accompanies an object’s breaking point?

Answer 7

snapping sound

Question 8

ability to allow heat or electricity to pass through

Answer 8

Conductivity

Question 9

materials that allow flow of heat or electricity; metals = ____ , plastics = ___

Answer 9

conductors, good, bad

Question 10

materials that do not permit flow of heat or electricity; ex: styrofoam, rubber, wood

Answer 10

insulators

Question 11

property unique to liquids and gases (collectively called fluid) that is due to its resistance to flow

Answer 11

viscosity

Question 12

properties that do not depend on the amount being measured; inherent characteristics of matter that depend on their composition and structure

Answer 12

intrinsic properties

Question 13

properties that depend on the amount being measured; characteristics that are not essential to the qualities of the material because they are influenced by external factors.

Answer 13

extrinsic properties

Question 14

characteristics that change the composition of substance due to chemical changes

Answer 14

Chemical properties

Question 15

changes the composition of metals causing it to deteriorate due to its exposure to the presence of oxygen

Answer 15

Corrosion

Question 16

Why do corroded metals change their color?

Answer 16

due to the presence of rust

Question 17

materials that easily catch fire = _____

Answer 17

flammable/combustible

Question 18

How is flammability a chemical property?

Answer 18

the composition of a substance changes through the burning process.

Question 19

a sale that measure the acidity/basicity of a solution

Answer 19

pH

Question 20

What does pH stand for? Why is it a chemical property?

Answer 20

“power of hydrogen”; pH is a chemical property because of the changes in composition, in terms of the number of hydrogen ions present in the solution

Question 21

characterized by its sour smell (and taste); pH below 7; turn blue litmus paper to red

Answer 21

Acids

Question 22

bitter and slippery solutions

Answer 22

Bases

Question 23

ability of matter to combine chemically with other substances; highly reactive reagents have hazard symbols for warning sign

Answer 23

Acidity

Question 24

• Used to warn about dangerous/hazardous materials, reagents, tools, locations; designed in such a way that they communicate the possible danger one might encounter in using the reagents label with easy-to-understand pictograms

Answer 24

Hazard Symbols

Question 25

In this file: https://drive.google.com/file/d/18nWHfoYnjYJc4yvoEDDmzzHAKSdCePir/view?usp=sharing

Identify the different hazard symbols.

Answer 25

Top (from left to right): health hazard, moderate hazard, radioactive, oxidising, explosive
Bottom (from left to right): flammable, environmental hazard, irritant or hurtful, poisonous or toxic, corrosive