# Due in 1 hour Rhenium (Re), with a mass number of 180 and an atomic number of 75, decays by emission of an alpha particle.

Due in 1 hour

Rhenium (Re), with a mass number of 180 and an atomic number of 75, decays by emission of an alpha particle. Identify the product of the nuclear reaction by providing its atomic symbol (5 pts), mass number (5 pts) and atomic number

What is the volume percent of a solution prepared by dissolving 20 g of KOH in enough water to make a final volume of 120 mL? Show your work. (b, 5 pts) How many mL of a 5% solution can be made from the solution in part a? Show your work.

Given that the molar mass of H2SO4is 98.1 grams, determine the number of grams of H2SO4needed to prepare 0.5 L of a 0.25 M H2SO4 solution. Show your work. (5 pts). (b) What volume, in Liters, of a 0.25 M H2SO4solution can be prepared by diluting 50 mL of a 10 M H2SO4

solution? Show your work

Given that the molar mass of H2SO4is 98.1 grams, determine the number of grams of H2SO4needed to prepare 0.5 L of a 0.25 M H2SO4 solution. Show your work. (5 pts). (b) What volume, in Liters, of a 0.25 M H2SO4solution can be prepared by diluting 50 mL of a 10 M H2SO4

solution? Show your work

Recently, you’ve noticed that your kitchen blender (brand YZ) is not blending food as well any more. You have decided to invest in a new blender. Before you make a decision on which model to purchase, you borrow three different brands of blenders AB, CD and EF from friends and family and test them for yourself. Formulate a testable hypothesis. (5 points) Design an experiment to test your hypothesis (5 points). Be specific in your experimental design and include your controls. (5 points) Predict the experimental results that would support your hypothesis.