What four elements did the ancient greeks think the world was made of?

a student determines the mass of a 100 mL beaker filled with 50 mL of water to be 154.34 grams. After a tablet reacts with the water, the mass including the dissolved tablet is 157.26 grams. Show the work and find the mass gained below.

Subatomic particle that has mass nearly equal to that of a proton, but carries no electrical charge

Consider the reaction: 2NO (g) + 2H2 (g) → N2 (g) + 2H2O (g) A suggested mechanism for this reaction follows: (1) NO (g) + NO (g) → N2O4 (g) (slow) (2) N2O4 (g) + H2 (g) → N2 (g) + H2O2 (g) (fast) (3) H2O2 (g) + H2 (g) → 2H2O (g) (fast) Based on

Martha Stewart does not do her own ironing because she: Select one: a. is not very good at ironing. b. has an absolute advantage in ironing. c. has a comparative advantage in ironing. d. has a comparative advantage in something else.

What happens to wood when it burns?

Are protons positive and neutrons neutral

Why might it be useful to determine the elements that a planet or moon is made up of?

Which of these is an example of a solution A Sand stirred in water B Sugar stirred in tea C A glass of water with ice in it D Oil and vinegar in a salad dressing jar

What are properties of colloid

An unknown gas has a pressure of. 0240 atm. what is the pressure in torr?