Elements

Honelako gehiago

Elements, Compunds & Mixtures

by Trudy Kwek

Elements, Compounds, Mixtures

by Siti Khadijah

INTRODUCTION TO FOOD ANALYSIS

by Sherlene Peter

COURSE OVERVIEW

by Georges Emock

Elements

Mixtures

Rate of dissolving

surface area of solute

temperature of solution

rate of stirring

Rate of solubility

nature of solute

nature of solvents

temperature

Suspension

a mixture in which 2 or more parts can be seen

Solution

a mixture that appears to be made up of one substance

homogeneous appearance

dilute, concentrated, saturated

types: - solid-solid eg. alloys- solid-liquid eg. calamine lotion- liquid-liquid eg. vinegar- liquid-gas eg. soda drinks- gas-gas eg. air

not mixed in fixed proportion

can be seperated by physical methods

has properties of tis constitutional substances

no chemical reaction involved

Seperations of mixtures

paper chromatography

fractional distillation

distillation

evaporation

filtration

magnetic attraction

Compounds

broken down by :-passing heat-passing electricity

formed by combustion/decomposition

fixed in proportion by mass

different properties form its constitutional elements

Periodic table

Non-metals

dull, brittle

Metals

shiny, malleable, ductile

7 periods, 9 groups