ChemLab Q1 Midterms

Precipitate

solid that forms when two solids are combined

two soluble reacts to create an insoluble product, usually appeare as fine particles

filtration

used filter paper to trap fine solid particles

decantation

involves pouring off the liquid from the solid that has settlee at the botton

evaporation

process that changes liquid water to gaseous water

residue

solid left behind after a physical process like evaporation

filtrate

the liquid collected after filtering a mixture to remove solid particles

precipitation

occurs when a precipitate forms rorm a liquid sol’n during a chemical reaction

supernatant

liquid that sits above the settled sol’n after sedimentation (process fo particlee settling to the bottom of the body of water)

orange

sodium chloride

pink/violet

potassium chloride

orange

calcium chloride

pink/red

lithium chloride

orange/red

strontium chloride

yellow-green/ orange

barium chloride

pink/orange

ferric chloride

orange/ bright yellow

sodium nitrate

pink/light violet

potassium nitrate

orange

calcium nitrate

red

lithium nitrate

orange/bright red

strontium nitrate

green

barium nitrate

organic compounds

contains carbon and can act as a furl for combustion

inorganic compounds

does not contain c-h bonds

physical change

does not create new substance but change its physical form

chemical change

leads to chemical transformation and created new substance

atomic spectra

When an atom is heated, it absorbs energy causing the electron to jump to higher energy level. At this state the atom Is said to be unstable (excited state). When an electron goes back to its ground state (unexcited state), it radiates the absorbed energy in the form of light which has a characteristics wavelength. The color emitted is equal to the difference in energy on the excited state and the ground state.

 

△E = E2 – E1

 

Weak

Distilled Water –

High

NaCI –

High but blinking

Acetic Acid –

High

Ammonium Hydroxide -

High

HCI -

High

NaDA -

High

urea

High

Copper Sulphate -

Weak

Sugar Solution -

Weak

Ethyl Alcohol -