Blog

If 100.0 mL of a 0.5 M aqueous solution of HCl is diluted to a final volume of 500.0 mL, what is the concentration of the diluted solution?  Work out the problem on a separate piece of paper and upload a photo of your response at the end of the test. Please mark the number of the problem clearly and show your work. Enter the concentration in the box below.   Answer _____________ M

Written Response General Guidelines: Express all numerical answers to the proper number of significant figures. You must show your work for full credit.

If a 4% starch solution and a 10% starch solution are separated by a semipermeable membrane, which of the following is true?

Answer the following questions using the simplified solubility rules below: Cations that are always soluble: Compounds of Group 1 cations (Na+, K+, etc.) and ammonium (NH4+) Anions that are always soluble: Nitrate (NO3−) Halides: Compounds of the halides (Cl−, Br−, I−) are soluble except for silver(I) (Ag+) and lead(II) (Pb2+). Sulfate: Compounds of sulfate (SO42−) are soluble except for Group 2 cations (Ca2+, Sr2+, Ba2+) and lead(II) (Pb2+). Everything else: Most other compounds not listed as soluble in rules 1–4 are assumed to be insoluble.

The value of the universal gas constant is 0.082 (L atm)/(mol K) or 8.31 J/(mol K) and 1.00 atm = 760 mmHg or 760 torr. When a sample of H2O2 is decomposed, 350 mL of O2 gas is collected at 20°C and at a partial pressure of 695 torr. How many moles of O2 gas were collected? Work out the problem on a separate piece of paper and upload a photo of your response at the end of the test. Please mark the problem clearly and show your work. Enter your answer in the text box below.

If a tray of ice is left in a freezer for a long time, the ice cubes gradually become smaller. This process is called ___________.

A tank contains a mixture of neon, argon, and helium. The total pressure in the tank is 490 mmHg or 0.645 atm. The partial pressure of helium and argon are 0.28 atm and 0.13 atm, respectively. What is the partial pressure of neon?

A 5.0-liter balloon is filled with 1.0 atm of gas. What is the volume of the balloon if it is submerged in water until the pressure inside the balloon is 4.0 atm?

What is the sign (or value) of ΔG at the point of time labeled A on the graph?

Your team is managing the launch of a new wood pellet grill as part of JZ’s Pellet Project. The launch involves multiple activities, each with varying durations. You need to determine the probability of completing the project within a specific timeframe. The activities and their respective optimistic (a), most likely (m), and pessimistic (p) time estimates (in weeks) are as follows: Activity Predecessor(s) Optimistic (a) Most Likely (m) Pessimistic (b) A – 2 4 6 B A 1 3 5 C A 2 5 8 D B, C 3 6 9 E C 1 2 3 F D, E 2 3 6 What is the probability that the project will be completed within 17 weeks? Report you answer in decimal form to the nearest hundredths place.