Explique las diferencias entre mezcla y combinación. De un ejemplo de cada uno.

Which of the following statements best describes what happens to water during vaporization? A. The temperature of the water increases until the water molecules react with nitrogen in the air. B.

What is the empirical formula of a substance that consists of 0.910 g calcium, 0.636 g nitrogen, and 1.453 g oxygen?

Consider the evaporation of methanol at 25.0∘c: ch3oh (l) →ch3oh (g). you may want to reference (pages 826 - 829) section 18.9 while completing this problem. part a part complete find δg∘ at 25.0∘c.

Any atom, ion, or molecule that can donate a pair of electrons to form a covalent bond is called

Limestone is primarily a crystal form of caco 3 . How many moles of oxygen are in a 1.25 mol sample of caco 3 ? Only include the numerical value in your answer. Do not include units.

How many moles of liquid water must freeze to remove 100 kJ of heat? (ΔHf = - 334 J/ g.

What is the power of a kitchen blender if it can perform 3750 joules of work in 15 seconds?

A 75.00 g a sample of a substance is analyzed and found to consist of 32.73 g phosphorus and 42.7 g oxygen. calculate the percent composition of this substance.

Which one of the following melts the fastest: rectangular prism, cylinder, and rectangular trapezoidal trough?

A 1.8-mL volume of seawater contains about 4.0 * 10^-10 g of gold. The total volume of ocean water is about 1.5 * 10^21 L. Calculate the total worth of all the gold in the world's oceans if the price of gold is $19.