Bohr Diagrams of the Atom

Atoms can be represented by Bohr diagrams. Bohr diagrams are useful for better

understanding the properties of an element, and for (it) predicting how an atom can combine

with others

The systematic names for water, ammonia, and methane are dihydrogen monoxide, H2O; trihydrogen nitride, NH3; and tetrahydrogen carbide, CH4. Why do most people, including chemists, prefer to use the common names for these compounds?

The methylene chloride solution is filtered through sodium sulfate to: a. Neutralize any acidic contamination b. Neutralize any alkaline contamination c. Dry the methylene chloride by removing water d. Precipitate the caffeine from solution

Why does the presence of lone pairs contribute to the polarity of a water molecule

A board has a mass of 750 g. If you ground the whole board down to sawdust, what would be the mass of the pile of sawdust?

You are on an island and need freshwater to drink. Which process could you use to separate the salt from ocean water and provide freshwater for drinking? O A. Distillation B. Chromatography C. Filtering O D. Freezing

What is the molarity of a solution that has 548 grams of HCl dissolved in 1.50 l water?

Steve puts some cheddar cheese in a pan on the stove and starts to melt it. After a little while, there is a layer of oil floating on top of the cheese. From the way the cheese melted, Steve knows it is a A Element B Solid C Mixture D Pure Substance.

Which experimental feature of the MALDI-MS technique allows the separation of ions formed after the adduction of tissue molecules? A) Distance travelled by ions depends on the ion charge. B) Velocity of ions depends on the ion mass-to-charge ratio.

Which temperature is required for the cell potential to be the standard cell potential? A) - 273°C B) 100°C C) 25°C D) 0°C

1. the purpose of the aqueous solutions in a galvanic cell is to? a. provide ions to be oxidized and reduced b. provide a path for the free flow of electrons c. maintain charge balance in the cell d. correct any volume changes in the cell 2.