When two substances are mixed and light is produced is it a chemical or physical change?

What is the ph of a solution if [oh-] = 2.3 x 10-5 m?

The 7 major lithospheric plates

When carbon-14 undergoes beta decay, it becomes which of the following? oxygen-13 + a beta particle nitrogen-14 + a beta particle carbon-13 + a beta particle boron-14 + a beta particle?

At which New York State location can intensely metamorphosed surface bedrock be found A) Rochester B) Old Forge C) Slide Mt. D) Utica

Calculate the mass percent composition of sulfur in Al2 (SO4) 3. Calculate the mass percent composition of sulfur in Al2 (SO4) 3. 28.12 % 42.73 % 35.97 % 9.372 % 21.38 %

10) A screwdriver has the density of 5.5 grams per cubic centimeter. It also has the mass of 2.3 grams. What is the screwdriver's volume?

A chemist weighed out 20.7 g of sodium. Calculate the number of moles of sodium she weighed out

If 1.00 mol of argon is placed in a 0.500-L container at 20.0 ∘C, what is the difference between the ideal pressure (as predicted by the ideal gas law) and the real pressure (as predicted by the van der Waals equation) ? For argon, a=1.

Part 2: Finding Speed and Height Using Energy Directions: Use the KE and GPE equations to solve for speed or height depending on the situation. 1. A 1,000-kg car has 50,000 joules of kinetic energy. What is its speed? 2.

Why is conductivity be the best test to find a metal, non-metal or metalloid?