CHEMISTRY MIDTERMS Flashcards
WHAT IS A PURE SUBSTANCE?
A PURE SUBSTANCE IS MADE UP OF ONLY ONE SUBSTANCE AND IS NOT MIXED WITH ANY OTHER SUBSTANCES.
NAME 3 EXAMPLES OF PURE SUBSTANCES.
Mg,NaCl,H20, a crystal.
WHAT DOES PURE SUGAR CONTAIN?
PURE SUGAR CONTAINS SUGAR CRYSTALS ONLY.
IF A SUBSTANCE IS IMPURE,WHAT DOES THIS MEAN?
THIS MEANS THAT THE SUBSTANCE IS MADE UP OF MORE THAN ONE KIND OF SUBSTANCE.
GIVE AN EXAMPLE OF AN IMPURE SUBSTANCE.
COPPER ORE.
WHAT IS A MIXTURE?
A MIXTURE CONSISTS OF TWO OR MORE SUBSTANCES THAT ARE COMBINED PHYSICALLY,NOT CHEMICALLY.
GIVE AN EXAMPLE OF A MIXTURE.
STONES IN SAND.
WHAT IS AN ALLOY?
ALLOYS ARE MIXTURES OF TWO OR MORE METALS.
NAME 3 EXAMPLES OF MIXTURES?
PDR (PETROLEUM,DETERGENT AND RUBY).
WHAT ARE THE TWO TYPES OF MIXTURES?
HOMOGENEOUS AND HETEROGENEOUS.
WHAT IS A HOMOGENEOUS MIXTURE?
A MIXTURE IN WHICH THE COMPOSITION IS UNIFORMED THROUGHOUT THE MIXTURE.
WHAT IS A HETEROGENEOUS MIXTURE?
A MIXTURE IN WHICH THE COMPOSITION IS NOT UNIFORMED THROUGHOUT THE MIXTURE.
IS A SOLUTION A HOMOGENEOUS MIXTURE OR A HETEROGENEOUS MIXTURE?
A HOMOGENEOUS MIXTURE.
WHAT IS A SOLUTION MADE UP OF?
A SOLUTE AND A SOLVENT.
EXPLAIN SOLUTE AND SOLVENT IN YOUR OWN WORDS.
STATE THE ANSWER IN YOUR OWN WORDS.
GIVE AN EXAMPLE OF A SOLUTION AND SAY WHICH ONE IS A SOLUTE AND WHICH ONE IS A SOLVENT.
SALT WATER WHERE THE SALT IS THE SOLUTE AND THE WATER IS THE SOLVENT.
WHAT DO YOU CALL A SOLVENT THAT IS WATER?
AN AQUEOUS SOLUTION.
WHAT DO YOU CALL A SOLVENT THAT IS NOT WATER?
NON-AQUEOUS SOLUTION.
WHAT IS A SATURATED SOLUTION?
A SATURATED SOLUTION IS WHEN THE MAXIMUM AMOUNT OF SOLUTE CAN DISSOLVE IN A GIVEN AMOUNT OF SOLVENT AT A FIXED TEMPERATURE.
HOW IS SOLUBILITY MEASURED?
THE MASS OF THE SOLUTE DISSOLVED IN 100G OF SOLVENT.
WHAT ARE THE THREE FACTORS AFFECTING SOLUBILITY?
TEMPERATURE,PRESSURE AND THE NATURE OF THE SOLUTE AND SOLVENT.
IS A COLLOID A HOMO OR HETEROGENEOUS MIXTURE?
A HETEROGENEOUS MIXTURE.
GIVE 2 EXAMPLES OF COLLOIDS.
MILK AND BLOOD.
WHAT IS AN EMULSION AND GIVE AND EXAMPLE.
AN EMULSION IS A TYPE OF COLLOID IN WHICH TINY LIQUID PARTICLES IS DISPERSED IN ANOTHER LIQUID.AN EXAMPLE IS MILK.
WHAT IS THE TYNDALL EFFECT?
THIS OCCURS WHEN THE PARTICLES ARE BIG ENOUGH TO DISPERSE LIGHT.
GIVE AN EXAMPLE OF A SUSPENSION.
A SANDSTORM.
WHAT IS A SUSPENSION?
A SUSPENSION IS A HETEROGENEOUS MIXTURE IN WHICH LIQUID OR SOLID PARTICLES ARE SUSPENDED IN A LIQUID OR GAS MEDIUM.
GIVE 3 EXAMPLES OF SUSPENSIONS.
SANDSTORMS,MUDDY WATER AND CHALK POWER SUSPENDED IN WATER.
