How do you know when a chemical reaction has taken place?

Exposure to even small amounts of radiation may cause a. dna changes b. hearing loss c. emphysema d. asthma

A sample of metal has a mass of 21.75g and a volume of 6.60mL. What is the density of this metal g/cm^3

If I add 475mL of water to 75.0mL of a 0.315M NaOH solution, what will the molarity of the diluted solution be?

The addition of which substance will decrease the solubility of AgNO3 in water? 1) 0.1 M potassium chloride 2) 0.1 M barium chloride 3) 0.1 M sodium nitrate 4) 0.1 M sodium carbonate

Identify the reactant and products in the following chemical reaction: CH4 + 2O2 ➡ CO2 + 2H2O

A man is making chicken noodle soup and has found it to be too salty. What method could he use to make the soup less salty? a. Add equal measured amounts of water to the soup. b. Bring the soup to a boil so that some of the broth evaporates. c.

A solution of H2SO4 (aq) with a molal concentration of 3.97 m has a density of 1.216 g/mL. What is the molar concentration of this solution?

How can you chose values for x when making a table of values representing a real world situation?

If a sample containing 2.50 ml of nitroglycerin (density=1.592g/ml) is detonated, how many total moles of gas are produced?

A helium balloon initially at room temperature is dunked into a bucket of liquid nitrogen (T = 77 K). Which of the following will occur?