Balmer series of emission spectrum is in visible region. What are the colours will it produce?

Why is cutting hair a physical?

1. The element 108/47 Ag has how many protons? A. 108 B. 47 C. 61 D. 107 E. 87 2. The element 238/92 U has how many neutrons? A. 330 B. 238 C. 184 D. 146 E. 92

Is the density of gas unaffected by changes in temperature?

A certain ore is 37.3% nickel by mass how many kilograms of this ore would you need to dig up to have 10.0g of nickel

What is the oxidation number of the chromium atom in k2cro4? what is the oxidation number of the chromium atom in? + 2 + 6 - 3 - 7 + 4?

Pieces of metal are welded together in an atmosphere of argon. Explain why an atmosphere of argon is used.

En que estado esta el nitrógeno en el cuerpo

Which sequence represents a correct order of historical developments leading to the modern model of the atom?

If you were designing a pot to cook spaghetti in, which parts would you make from good conductors of heat? which parts would you make from insulators? explain your answer.

1. Starting with 9.3 moles of O2, how many moles of H2S will be needed and how many moles of SO2 will be produced in the following reaction? SHOW YOUR WORK! 2 H2S + 3 O2 - > 2 SO2 + 2 H2O