The Earth's atmosphere is made up of approximately

__

% nitrogen.

A. 1

B. 21

C. 78

D. none of the above

What mass of NaOH us required to prepare 2.5dm of 1.5 M NaOH solution

Qué relación hay entre los campos eléctricos y magnéticos?

Which element in period 2 has the most mass

What is the current (measured in amps) in a 120V circuit if the resistance 5Ω? What is the current (measured in amps) in a 120V circuit if the resistance 10Ω? What is the voltage in a circuit that has a current of 2.4 A and a resistance of 4.

An 80.0-gram sample of a gas was heated from 25 °C to 225 °C. During this process, 346 J of work was done by the system and its internal energy increased by 7845 J. What is the specific heat of the gas?

If you see the Sun is high in the sky, what can you say about the SUN as viewed from the opposite side of Earth at the same moment?

What element has 8 valence electrons

Which of the following best describes a metal? Brittle, shiny, and solid Brittle, dull, and low density Malleable, shiny, and able to conduct heat or electricity Malleable, dull, and solid, liquid, or gas at room temperature?

Which of the following errors could cause your percent yield to be falsely high, or even over 100%? Select ALL that apply. A.) Heating the sample too vigorously. B.) Handling the crucible directly with your hands. C.

If 56.8 ml of bacl2 solution is needed to precipitate all the sulfate ion in a 554 mg sample of na2so4 (forming baso4), what is the molarity of the solution?