What is the hydronium ion concentration of a solution whose pH is 12.40?

Calculate the molarity of a solution that contains 0.300 moles of csbr in 0.600 l of water.

For which compound is the process of dissolving in water exothermic? (1) NaCl (3) NH4Cl (2) NaOH (4) NH4NO3

Which of these is probably a homogenous mixture? A. Soil B. Sand C. Tap Water D. Salad Dressing

Since 1983, pennies have been made with zinc and plated with copper. Prior to 1983, pennies were about 95% copper and 5% tin and zinc. However, from 1793-1837, pennies were pure copper. If you had a penny from 1800 that had a mass of 2.

If equal masses of aluminum and copper are heated with same amount of heat, which would reach the higher temperature? Explain your answer.

Several steps are involved in the industrial production of sulfuric acid. One step involves the oxidation of sulfur dioxide gas to form sulfur trioxide gas. A catalyst is used to increase the rate of production of sulfur trioxide gas.

All energy waves other than the visible light spectrum cannot be seen. true or false

Describe two important functions for carbon dioxide in the atmosphere.

In the chemical reaction: 2 h 2 (g) o2 (g) → 2 h2o (g), with 8 grams of h 2 (2 grams/mole) and 16 grams of o2 (32 grams/mole) and the reaction goes to completion, what is the excess reactant and how much of that would remain

What is the volume of a gold nugget that weighs 2.20 kg? The density of gold is 19.28 g/cc.