WGU D425 INTRODUCTION TO CHEMISTRY 107 COMPLETE TEST PAPER WITH CORRECT ANSWERS

WGU D425 INTRODUCTION TO CHEMISTRY
107 COMPLETE TEST PAPER WITH CORRECT
ANSWERS

◉ % by Volume.
Answer: Volume percentage of a component in a solution
formula: mL of part/mL of whole * 100
= mL of solute/mL of solute + solution *100


◉ % by mass/volume.
Answer: Mass percentage of a solute in a volume of solution
Formula: g of solute/mL of whole *100


◉ Molarity.
Answer: Concentration of a solution in moles of solute per liter of
solution
mole of solute/total volume of solute+ mL of solvent


◉ Dilution Formula.
Answer: C1V1 = C2V2; initial concentration x initial volume = final
concentration x final volume

, ◉ Metric prefixes.
Answer: Units used to indicate multiples or fractions of base units in
the metric system


◉ Density.
Answer: Mass per unit volume of a substance
Density=Mass/Volume


◉ Average atomic mass.
Answer: Weighted average mass of isotopes of an element
sum of all values(atomic mass of isootope * decimal abundance)


◉ Classes of chemical reactions.
Answer: Categories of reactions: synthesis, decomposition, single
replacement, double replacement, combustion, redox


◉ Synthesis reaction.
Answer: a reaction in which two or more substances combine to
form a new compound


◉ Decomposition Reaction.
Answer: AB --> A + B