Convert 90 centuries to minutes

When doing a recrystallization what observations would prompt you to perform a hot filtration?

The radioisotope cesium-137 has a half-life of 30 years. a sample decayed at the rate of 544 counts per minute in the year 1985. in what year will the decay rate be 17 counts per minute?

Which substance will require more energy to heat if all the samples have the same mass and same temperature change?

Which of the following pairs does not share the same empirical formula? C2H6 and C4H12 C3H6O3 and C2H4O2 C3H8O and CH2O C2H8 and CH4

Which is better solar energy or wind energy And what is the best form of renewable energey What does it mean if energy is renewable

The force that moving, charged particles exert on one another is called? a. Contact force b. Intermolecular force c. Gravity d. Electromagnetic force

Which of the following types of electromagnetic waves has a frequency greater than ultraviolet waves? A) X rays B) infrared waves C) microwaves D) visible light

For each metal complex give the coordination number for the metal species. m (nh34cl2

Particles in a liquid move around just as freely as particles in a solid. True or False

How did aristotles idea of matter differ from that of scientists