A student estimated a mass to be 250 g but, upon carefully measuring it, found the value to be 240 g. What is the percent error of the estimated mass if the measured value is the accepted one?

A. 4.0%

B. - 4.2%

C. - 4.0%

D. 4.2%

A beaker holds 962 g of a brine solution that is 6.20 percent salt. If 123g of water are evaporated from the beaker, how much salt must be added to have an 8.60 percent brine solution? How many grams of the 8.6% brine solution will be produced?

What happens to water molecules during the boiling process?

What is the basic notation for a proton?

You want to remove as much CO2 gas as possible from a water solution. Which of the following treatments would? a. cool the solution b. filter the solution c. boil the solution d. aerate the solution

During meiosis crossing over gene exchange between chromosomes may occur. crossing over usually results in

Is a sodium cation smaller or larger than a sodium atom

What would the charge be on an atom with 9 protons 9 electrons and 10 neutrons

PH + pOH = 14. What is the hydroxide concentration of a solution with pH of 8?

A student Increases the temperature of a 417 cubic centimeter balloon from 278 K to 231 K. Assuming constant pressure what should the new volume of the balloon be

What is the molarity of a solution with 1.17 moles of Ca (OH) 2 disolved in 0.2 liters of water? A. 1.17 M B. 0.2 M C. 0.17 M D. 5.85 M