The mass of an atom may be determined by adding the masses of the protons and neutrons in the nucleus. Why is it unnecessary to include the electrons when determining the mass of an atom?

Which of the following is true about a redox reaction? In a redox reaction, an electron is lost by the reducing agent. In a redox reaction an electron is lost by the oxidizing agent.

Becky is preparing tea. When the water for the tea boils, she pours it in a cup of cold milk. Assuming that the system is closed and that thermal energy distribution is uniform when the hot water mixes with the cold milk, which of the following is

Given the mass lost during the reaction when the alka seltzer is the limiting reagent and that the molar mass of carbon dioxide is 44.01 g/mol, how many moles of CO2 were produced

A pipet is a type of glassware that is used to deliver a specified volume of liquid. A 5 mL pipette has major scale divisions marked for every milliliter and minor scale divisions marked for every 0.1 mL.

How many sodium atoms are in one formula unit of sodium nitrate?

A saline solution contains 1.6 % NaCl by mass. How much NaCl is present in 57.2 g of this solution?

During a laboratory experiment you discover that an enzyme-catalyzed reaction has a delta G of - 20 kcal/mol. If you double the amount of enzyme in the reaction, what will be the delta G for the new reaction

What is the molarity of a hydrochloric acid solution prepared by diluting 200.0 ml of 0.500m hcl to a total volume of 1.00 l?

How does a metallic bond differ from an ionic bond

Give two examples of chemical energy being transformed into electrical energy