Three clues that indicate a chemical change

A sample of radium-226 will decay to 1/4 of its original amount after 3200 years. What is the half-life of radium-226? Found Answer: 1600

Which of these is an example of convection? Question 19 options: A. an egg boiling in water B. an egg frying in a pan C. an egg exposed to a flame D. an egg warming under a light

Ultraviolet waves can; A - enable your body to produce vitamin D B - cause cancers C - cause skin damage D - all of the above

The process of charging a conductor by bringing it near another charged object and then grounding the conductor is called a. contact charging. c. polarization b. induction. d. neutralization.

A monochromatic light passes through a narrow slit and forms a diffraction pattern on a screen behind the slit. As the slit width increases, the diffraction pattern: O becomes dimmer. O shrinks with all the fringes getting narrower.

In our physical world, by far, the most abundance free charge in the universe is the electron, which has a negative charge. What do we mean, then, when we say that the surface of an object is positively charged?

You're going camping and are thinking of carrying 3 gallons of water. How much does the water weigh, in units of pounds?

A student is performing a double-slit experiment to determine the wavelength of a light source. She has measured the distance between dark bands and the distance between the slits and the screen.

If a substance cannot be broken down chemically into smaller substances it is A) An element B) a compound C) an atom D) a molecule

Describe the general characteristics of the nearest stars. (Size, luminosity, color, etc., do not include specific stars)