What is the half-life of sodium-25 if 1.00 gram of a 16.00-gram sample of sodium-25 remains unchanged after 237 seconds?

(1) 47.4 s (3) 79.0 s

(2) 59.3 s (4) 118 s

How many atoms of aluminum are there in a sample with a mass of 100.0 grams?

The temperature of a liquid is measured to be 212 °F. Soon afterward, the temperature is taken again and is determined to be 100 °C. Which of these is a possible true statement about the motion of the liquid's particles? A.

Is sulfur hexafluoride a compound?

You need to prepare a solution with a specific concentration of Na+Na + ions; however, someone used the end of the stock solution of NaClNaCl, and there isn't any NaClNaCl to be found in the lab. You do, however, have some Na2SO4Na2SO4.

What happens when sodium and potassium react with water?

A rigid cylinder with a movable piston contains a 2.0-liter sample of neon gas at STP. What is the volume of this sample when it's temperature is increased to 30 degrees Celsius while its pressure is decreased to 90 kilopascal

Write a speech aimed at year 7 to explain why some metals lose their shine over time but gold does not.

How many moles of co2 could fit in a 475 ml bag at - 22c and 1.125 atm?

How mant atoms are in 3N2

The type of nuclear decay an unstable nucleus will undergo depends on its ratio of neutrons to protons. The radioisotope cobalt-65 has a ratio of neutrons to protons of 1.41, which is too high for a nucleus of this size.