Two of Dalton's theories were disproven:

1. All atoms of a given element are the same.

2. Atoms can't be divided into smaller pieces.

Q: Who disproved theory 1?

A:?

Q: Who disproved theory 2?

A: J. J. Thompson?

If the decomposition of hydrogen peroxide is a first order reaction and it takes 20.0 minutes for the initial concentration to fall from 1.6M to 0.80M, how much time has passed when only 0.050M remain a) 80 min b) 120 min c) 100 min d) 40 min

Learning Goal: To practice Problem-Solving Strategy 32.1 Electromagnetic Waves. An electromagnetic wave in a vacuum traveling in the + x direction generated by a variable source initially has a wavelength λ of 305 μm and a maximum electric field

When you answer someones question how do you make it so your answer is verified?

Who is doing work. A Becky studies for her test. B Bob carries a baby across the hall C sally pushes a stroller around the block D Ben holds a plank for one minute

Calculate the moment of Inertia for a ring with a mass 0.715 kg, an inner radius of 10.7 cm and an outer radius of 12.7 cm.

Dr. Halite combined sodium metal with chlorine gas to make sodium chloride (table salt). the chemical reaction used up all of the metal and all of the gas. If Dr.

Which planet, when viewed through a telescope, appears as a reddish ball interrupted by some permanent dark regions that change intensity?

A wave has a wavelength of 10 mm and a frequency of 5 hertz. What is its speed? a. 50 mm/s b. 50 hertz's c. 2 mms d. 0 0.50 mms

Suppose you illuminate two thin slits by monochromatic coherent light in air and find that they produce their first interference minima at / pm 35.09 degrees on either side of the central bright spot.

Tala wants to create a sound echo. She can create the echo using a pane of glass or a carpet square. Which one does she choose? Explain.