Gold has a molar mass of 197 g/mol. (a) how many moles of gold are in a 3.98 g sample of pure gold? (b) how many atoms are in the sample?

Determine the oxidation number of oxygen in the carbonate ion found in malachite

Which of these statements about neutrons is true? A. Neutrons travel around the nucleus of an atom. B. A neutron has no charge. C. Neutrons have less mass than electrons. D. The number of neutrons in an atom always equals the number of electrons.

A 7th grade science class placed three large grade A eggs into beakers and recorded the mass. They then filled one beaker with vinegar, one with corn syrup, and one with distilled water. After 5 days, they recorded the new masses of the eggs.

A sample contains 430 mg of mercury. How many significant figures are in the number?

Which human activity has the most negative impact on water quality

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