Iodine-131 is a radioactive isotope with a half-life of 8 days. how many grams of a 64 g sample of iodine-131 will remain at the end of 24 days?

Wasser and water are examples of cognates. True or False

A sample of Kr at 190.21 °C experiences a change in volume from 36.367 L to 89.148 L. If its new pressure is 5.4862 atm at - 88.82 °C, what was its original pressure in torr

What are some examples of kitchen chemistry

A mole is most similar to?

What do you think caused the balloon to expand

What shape is the magnetic field produced when current is passed through a wire? a. Parabolic b. Elliptical c. Circular d. Bimodal

What year was the hole in the ozone layer detect in the antarctica?

Sodium (NA) and potassium (K) are in the same group in the periodic table. Sodium is in the 11th position. How many valence electrons does potassium have? A) 0 B) 1 C) 9 D) 11

Which of the following is not caused by the moon? a. moonrise b. tides c. eclipses d. sunrise

Approximately how many mineral species have scientists identified? 250 5000 1500 60