A walkman uses a current of 2.0 A and has an internal resistance of 3.0 Ω, how many 1.5V batteries are required?

A Question Pre You are conducting an experiment with two very reactive substances. One will react with oxygen (O) and other substances in the air, and the other will react to metal in a container.

How many hydrogen ions are in 1 liter of stomach acid? (Hint: Avogadro's number). Show your work and remember to put your answer in regular number form (NOT scientific notation).

A 205-ml solution of nacl was electrolyzed for 8.20 min. if the ph of the final solution was 12.28, calculate the average current used.

A gas in a fixed container is at a pressure of 4 atm and at a temperature of 27 o c. what will its pressure be if it is heated to a temperature of 177 o c? (just write the numerical answer.)

Secure a gallon metal can. Remove the lid and heat the can for five minutes with a Bunsen burner. Carefully replace the lid to seal the can. Remove the can from the flame and run cold water over the can.

What energy conversion occurs when a battery powered car rolls across the floor?

A sample of gas has a volume of 5.79 L at 25C and 518. What will be the volume of this gas at STP

Calculate the pH of a buffer consisting of 0.50 M HF and 0.45 F - a) before b) after addition of 0.40 g of NaOH to 1.0 L of the buffer

Materials with small, connected pores are a. impermeable c. unsaturated b. permeable d. saturated

Which of the following work by Robert Hooke most likely impacted later scientists who developed the theory that all organisms are made of cells? a.