I need help ASAP!!

I need help ASAP!!

How are potassium-39, potassium-40, and potassium-41 different from each other? Write the isotope symbol for each?

Give the numerical answer (regular number not scientific notation) and do not use units.

1. To be an effective energy source, a nuclear reaction must sustain itself. What characteristic of the proceeding reactions allows them to continue without input from an external source? 2...

The recommended daily allowance of calcium for a human is 800.0mg/day. If one cup of 2% milk (d=1.032 g/mL) contains 240.0 mg of calcium, how many grams of milk must you drink a day to get your recommended...

True or false, and give reason.

an aqueous solution is 5.50% by mass of a nonelectrolyte (MM= 134 g/mol). If the density of the solution is 1.026 g/mL, calculate the molarity, mole fraction and molarity of the solution. I...

What will be e.m.f of the cell 2 Ag+ + Cu gives Cu+2 + 2Ag Given: Eo Ag/Ag+ = -0.8v Eo Cu+2/Cu = 0.3v Options: a)-0...

Show all calculations

show all calculations and explain how I would get the answer with this information.

A) Available evidence provided suggests that about 20% of the asteroidâ€™s mass turned to dust and spread uniformly over the Earth after settling out of the upper atmosphere. This dust amounted to about...

i want to know is this true or false

A substance has a density of 2kg/L. 4kg of this substance is then placed in 10 liters of water. What is the volume percent of this in 10 mL water?

Fat gives 9 cal/g of energy

Ionisation energy of Cl- is 349KJ/mole. Approximate heat liberated when an electron is added to gaseous atom a)5x10-20J b)5.9x10-19J c)6.5x10-20J d)3.49x10-26J

Density of gas is .737g/ml. You pump 7.2 gallons of gas. How much mass did you add to the car in kilograms?

Please answer. I'm really bad a chem so I don't understand what to do

A lab group is provided with a 1.35 x 10-4 M stock solution of Allura Red and a 25.00 mL volumetric flask. A student prepares a dilute solution by pipeting 2.00 mL of the stock solution into the 25...

Urgent help needed

I have to use a chart but I'm not sure how to start it.

Kevin A.

MIT Ph.D. Passionate Organic Chem, Chem, Physics, MCAT/DAT, Math Tutor

Montclair, NJ

5.0
(453 ratings)

Jeffrey G.

Former Med-Student turned Professional Science Tutor

Brooklyn, NY

5.0
(366 ratings)

Richard B.

Effective and Experienced Math and Science Tutor and Teacher

South Orange, NJ

5.0
(201 ratings)