Fri. May 24 quiz Flashcards
what is an observation
noticing something with the five senses or a scientific instrument
define qualitative observations
-made using yhe senses
- no measurement involved
define quantitative observations
observations that are measured and assigned a numerical value
what are the two types of properties
intensive and extensive
define intensive property
a property that does not change depending on how much of the substance there is
define extensive property
a property that does change depending on how much if the substance there is
name nine qualitative properties
colour, texture, odour, lustre, clarity, taste, state, malleability, ductility
define lustre
shiny, dull, glossy
define malleability
how well something can be mushed around
define ductility
how stretchy something is
name 5 quantitative properties
boiling/freezing point, viscosity, solubility, conductivity, density
define viscosity
how thick a liquid is (thick=high viscosity”
define solubility
how well something dissolves in water
write the equation for density
Density=mass/Volume
(mass*Volume=Density)
what is a chemical change?
any change that results in the formation of a new chemical/substance
what are the clues that a chemical change has taken place?
-new colour
-new heat emission
-light production
-gas production
-new odour
-precipitate (solid) is formed
what is a physical change
a change that doesnt create a new substance
what is a chemical property
the ability of a substance to change and form new substances
what are the five chemical properties
reactivity, combustibility, light sensitivity, stability, toxicity
