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Questions in chemistry

[Answered] How might radar images help to reduce damage from an approaching storm?

[Answered] What does the number next to isotopes signify?

[Answered] How can you tell isotopes of the same element apart?

[Answered] How can you tell just by looking whether a mixture in water is a solution or a suspension?

[Answered] What happens to the average kinetic energy of the water molecules in your body when you have a fever?

[Answered] Five liters of gas at STP have a mass of 12.5 g. What is the molecular mass of the gas? A. 12.5 g/mol B. 25.0 g/mol C. 47.5 g/mol D. 56.0 g/mol E. 125 g/mol

[Answered] Which of the following sequences lists the relative sizes of particles in a water mixture from smallest to largest? A. Solutions, suspensions, colloids B. Solutions, colloids, suspensions C. Colloids, solutions, suspensions D. Colloids, suspensions, solutions E. Suspensions, colloids, solutions

[Answered] Which one of the following elements does not exist as a diatomic molecule in nature? A. Hydrogen B. Nitrogen C. Fluorine D. Neon

[Answered] An archaeologist discovered some charcoal at an excavation site. He sent the samples to a lab for C-14 dating, knowing that the half-life of C-14 is approximately 5,600 years. The lab reported that the charcoal had 1/8 the amount of C-14 in it that a living sample would have. How many years old was the charcoal? A. 700 years B. 1,867 years C. 8,400 years D. 16,800 years E. 44,800 years

[Answered] The half-life of thorium-227 is 18.72 days. How many days are required for three-fourths of a given amount to decay?