Answer Options:
adding 80 g of sugar to 25 g of water
adding 24 g of KCl to 50 g of water
adding 130 g of NaNO3 to 75 g of water
Answer: saturated
saturated
saturated
Question: What is the formula for molybdenum(IV) oxide?
Answer Options:
MoO
Mo2O3
MoO2
Mo2O5
Answer: MoO2
Question: In the relationship described by the combined gas law, which parameter of a gas must be assumed to be constant?
Answer Options:
Answer: n
Question: What is the mass of the anhydrous mineral, anhydrite: BaCa(SO4)2?
Answer Options:
Answer: 1,966.56 (with margin: 0.005)
Question: Calculate the % (m/m) for 1.6 g of KOH dissolved in 40.0 g of water.
Answer Options:
Answer: 3.9
Question: The most abundant isotope of gold is Au-197. How many protons are in this isotope?
Answer Options:
Answer: 79
Question: Which indicators of a chemical reaction could have been used to identify the chemical reaction, based just on what you observed in this silent video in Q1? Choose all that apply.
Answer Options:
color change
effervescence
temperature change
there was no chemical reaction.
precipitation
Answer: effervescence
temperature change
precipitation
Question: The pH of a 0.05 M solution of KOH is
Answer Options:
0.50
13.5
1.3
9.7
12.7
Answer: 12.7
Question: Determine the pOH if [OH-] = 2.0×10^-5 M.
Report to 2 decimal places
Answer Options:
Answer: 4.70
Question: Which of the following measurements are NOT equivalent?
Answer Options:
Answer: 86 cm = 84 mm