What are the main classifications or categories of elements in the periodic table?

Why must scientists use standard units of measure in their experiments

Why is it impossible for a machine to give you more energy output than the amount of energy put into it? A: This would violate the law of conservation of energy B: This would cost too much C: This would produce too much wasted heat

Which statement accurately describes the atoms of a specific element? A) An indium‚ In‚ atom contains 115 protons inside the nucleus and 49 neutrons outside the nucleus.

Given the reaction: 4NH3 + 3O2 → 2N2 + 6H2O. How many moles of N2 are produced when 1.0 mole of NH3 is consumed?

Compare and contrast the different way heat moves

An archer pulls her bowstring back 0.370 m by exerting a force that increases uniformly from zero to 264 N. (a) What is the equivalent spring constant of the bow?

If 5.0g of KCLO3 is decomposed, what volume of O2 is produced at STP?

For metallic structures, does the packing efficiency (see sample exercise 12.1 in textbook) increase or decrease as the number of nearest neighbors (the coordination number) decreases?

In which reaction is mass converted to energy by the process of fission?

Watch It! #3 After watching the examples in the video of radiation, list 2 other examples that you come up with on your own.