BSES 25 - SAMPLE LAB QUESTIONS Flashcards
WHAT IS THE USE OF THE GLASS ROD IN TRANSFERRING LIQUID REAGENTS
spills are prevented by using glass rods to transfer liquid reagents. the maximum amount of liquid can be transferred because it is made possible for the liquid to flow on the middle of glass rod.
WHEN HEATING LIQUIDS IN A TEST TUBE, WHY IS THE TEST TUBE MOVED BACK AND FORTH ACROSS THE FLAME
to ensure even heating, the test tube must be moved back and forth. if we fail to do that, the test tube would be result in breaking
WHY SHOULD THE SPATULA USED FOR SPOONING SOLID CHEMICALS FROM A REAGEN BOTTLE BE CLEAN AND DRY
to prevent contaminations to enter the reagent bottle
WHAT IS FORMED WHEN CALCIUM CHLORIDE AND SODIUM CARBONATE ARE MIXED
CALCIUM CARBONATE AND SODIUM CHLORIDE
COMPARE FILTRATION WITH DECANTATION
FILTRATION USE FILTER PAPER TO SEPARATE FINE PARTICLES
DECANTATION IS JUST SIMPLY POURING INTO THE REAGENT BOTTLE
WHAT PRECAUTIONS SHOULD BE FOLLOWED IN PREPARING DILUTE ACID SOLUTIONS
ACID TO WATER
EXPLAIN THE USE OF EVAPORATION IN SEPARATING SOLUBLE SOLIDS FROM LIQUIDS
EVAPORATION PROCESS IS THE SEPARATION OF LIQUIDS AND SOLIDS, WHEREIN THE LIQUID TURNS INTO GAS, AND THE SOLID WILL REMAIN
DIFFERENTIATE PHYSICAL CHANGE FROM CHEMICAL CHANGE
PHYSICAL CHANGE IS THE ALTERATION OF CHARACTERISTICS LIKE TEXTURE, SHAPE, TEXTURE, OR STATE OF BEING.
CHEMICAL CHANGE OCCURS WHEN A NEW SUBSTANCE WITH NEW PROPERTIES IS CREATED
DIFFERENTIATE EXOTHERMIC FROM ENDOTHERMIC
EXOTHERMIC - RELEASES HEAT AND TEMP RISES
ENDOTHERMIC - ABSORBS HEAT AND TEMP COOLS DOWN
WHAT ARE THE INDICATIONS THAT A CHEMICAL REACTION IS TAKING PLACE
FORMATIONS OF BUBBLES
CHANGE IN COLORS
CHANGE IN ODOR
CHANGE IN TEMPERATURE
FORMATION OF A PRECIPITATE
WHAT DETERMINES THE AMOUNT OF PRODUCTS IN A CHEMICAL REACTIONS
LIMITING THE REAGENTS
WHAT SUBSTANCE IS FORMED WHEN WATER IS ADDED TO METALLIC OXIDE
METALLIC HYDROXIDES
EXPLAIN HOW ELECTROLYTES CONDUCT ELECTRICITY
MOLECULES ARE BROKEN INTO IONS
HOW DO INDICATORS DISTINGUISH ACIDS FROM BASES
RED LITMUS PAPER TURNS BLUE - BASIC
BLUE LITMUS PAPER TURNS RED - ACIDIC
WHY MUST THE EQUATION BE BALANCED
TO EQUATE THE NUMBER OF ATOMS OF THE REACTANTS TO THE NUMBER OF ATOMS OF THE PRODUCTS
