After the discovery of the electron, scientists knew that atoms must also have positively changed particles because?

A. Atoms have mass

B. Atoms have electrical charge

C. Atoms have neutral charge

1. Will biogas burn with a flame. why? 2. when iron is heated strongly, it becomes red hot and glass but does not burn with a flame. Why?

Frying a pancake is an example of a) conduction b) convection c) radiaton

A rocket burns fuel to produce thrust, the force that moves the rocket forward. true or false

A particular form of electromagnetic radiation has a frequency of 4.21 * 1015 Hz. (a) What is the wavelength in nanometers? In meters? Enter your answer in scientific notation.

The earth's worst mass extinction was: Late Devonian Ordovician-Silurian Permian-Triassic End Triassic Cretaceous-Tertiary

What is the wavelength of an earthquake wave if it has a speed of 5 km/s and a frequency of 10 Hz?

The gamma ray released by each decay carries 140kev of energy. find the total energy e released by decays in the 2 hours.

Think of the last five things you read. Now think of a type of reading you havent done recenty have never read. What kind of pattern do you see in your reading? What is your favorite type of reading and your least favorite type of reading?

Consider this statement: Air is matter. Which facts best support the statement? A. Balloons can be filled with air. B. Air is essential for life to exist. C. Air has mass. D. Air is not an element. E. To float on air is to be happy. F.

Hydroelectric power uses: wind water coal the sun