Is the use of a toaster 100% efficient? Why or why not

A student combine equal amounts of two solutions. One solution ha a pH of 2 and the other half had a pH of 12. Which would most likely be the resulting pH?

A pitcher throws a softball toward home plate. When the ball hits the catcher's mitt, its horizontal velocity is 32 meters/second. The softball's velocity goes to 0 meters/second in 0.8 seconds when caught. If the softball has a mass of 0.

An astronomer wants to visualize the relative distances between planets in our solar system. A biologist wants to examine the branching of blood vessels within the body. A chemist wants to see the angles between bonds in a molecule.

A student generates water waves in a pool of water. In order to increase the energy carried by the waves, the student should generate waves with a (1) greater amplitude (2) higher frequency (3) greater wavelength (4) longer period

After Moseley's discovery in 1913, the periodic law stated that physical and chemical properties tend to repeat periodically when elements are arranged according to what trend?

Define valence electrons and identify the number of valence electrons in an element using periodic table.

What is the phenomenon thats occours when two waves (blank) while traveling along the same medium

The acceleration of an object increases by the force applied to it and decreases based on it's mass.

Expresa en terminos de la unidad fundamental

What color does Indigo turn things?