How to find how many electrons are in an element

When you open a bottle of soda, bubbles of carbon dioxide start appearing. Is this a chemical or physical change and why?

What is the mass of a steel cylinder that has a density of 75.0 g/ml and a volume of 12 ml?

A straight chained hydrocarbon with this formula C5H10, has a triple paired C-C bond, has a double paired C-C bond, is essentially inert, or is unstable and extremely reactive.

A student will measure and record the growth of two flowering plants every day for 28 days. Plant A will be watered and fertilized, Plant B will only be watered. The student predicts fertilizer added to the soil leads to taller flowering plants.

Which of the following functional groups comprises a carbon atom bonded to a hydroxyl group? A. ester B. alcohol C. thiol D. carbonyl

Under the Implied Consent law, which of the following is true? A. Your driving privileges will be suspended if you refuse a chemical test to measure your alcohol level. B.

If 0.366 g of hydrogen is obtained in this experiment, how many grams of sulfur must be obtained

A substance that does not conduct electricity as a solid but does conduct electricity when melted is most likely classified as (1) an ionic compound (2) a molecular compound (3) a metal (4) a nonmetal

A conical, flat-bottomed flask with a narrow neck that can be used for heating, mixing, watching reactions, and swirling, not for measuring

Answer 1. the law of conservation of mass states that mass is neither created nor destroyed in an ordinary chemical reaction. when an iron nail rusts, it seems to get heavier in mass. does the iron nail follow the law of conservation of mass?