how long was all the matter in the universe theorized to be compressed into a minuscule scalding mass?

What is an example of the absolute refractory period

when 46 grams of water are produced how many grams of oxygen must react according to the equation 2h2+o2=2h2o

Fritz Haber, a German chemist, discovered a way to synthesize ammonia gas (NH3) by combining hydrogen and nitrogen gases according to the following equation: 3H2 (g) + N2 (g) → 2NH3 (g) What volume of nitrogen is needed to produce 250.

Group 1 includes the alkali metals. what are the general properties of elements in this group

Calculate the mass of 1.0 L of helium (He), 1.0 L of chlorine gas (Cl2), and 1.0 L of air (79% N2, 21% O2 by volume) at 25°C and 1 atm total pressure. Explain why a balloon filled with helium rises and why leaks of chlorine gas can be dangerous.

What is the ability of a substance to be pulled into a wire? A malleability B ductility C conductivity D solubility

When a counterfeit detection pen is used on an authentic bill, what color does it turn? a. Pale blue b. Pale yellow c. Blue-black d. Pale pink

Why are the outer-most electrons the only ones included in the electron dot diagram?

What is the relationship between law of conservation and chemical reaction?

How quickly must non-frozen ready-to-eat foods be consumed? 24 hours . 48 hours . 3 days . 7 days