Which of the following is true concerning the chemical properties of gypsum materials?
A) Chemically,the mineral gypsum is a hemihydrate of calcium carbonate.
B) To form the raw material into a powder,the manufacturer heats it and adds water.
C) When the dihydrate is again mixed with water,a product with a viscosity capable of flowing is produced.
D) The amount of water required to mix the calcium sulfate hemihydrate is greater than the amount required for the chemical reaction.
Correct Answer:
Verified
Q2: Model plaster has a water-to-powder ratio of
Q3: Which of the following is true regarding
Q4: An increase in the recommended water-to-powder ratio
Q5: Which of the following will accelerate the
Q6: Which of the following statements is true
Q8: Which of the following gypsum products is
Q9: As the temperature of the wax increases,the
Q10: When proportioning gypsum products,the water should be
Q11: β-Hemihydrate is commonly used for:
A) die stone.
B)
Q12: When working models for cast restorations are
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