What do we mean by the half-life of a radioactive isotope?

What are the primary colors of light and why are they called primary colors

Would an acid taste bitter or sour?

The temperature of 100. grams of water changes from 16.0ºC to 20.0ºC. What is the total number of Joules of heat energy absorbed by the water?

When sodium is excited in a flame, two ultraviolet spectral lines at (wave length symbol) = 372.1 nm and (wave length symbol) = 376.4 nm respectively are emitted. Which wavelength represents photons with

Which items contain plasma? a. gelatin b. lightning c. a fluorescent light bulb d. lava

How do you measure the mass of a liquid?

Given the following information, calculate the mass for B-11. B-10 has a natural abundance of 19.9 percent, while B-11 has a natural abundance of 80.1 percent. The mass of B-10 is 10.013 amu.

How many moles of oxygen react with 0.23 moles of NH3

How many moles of carbon do you have in 100 quadrillion carbon atoms? report answer to 2 sig figs

A small 15 kilogram canoe is floating downriver at a speed of 4 m/s. What is the canoe's kinetic energy?