CHEM 120 Unit 1 Quiz (100% Correct Solutions)

Question: What is the mass in kilograms of a copper pipe that weighs 12.5 pounds? (1 lb = 453.6 g)? Question: Select all of the following that are equal to 0.4 km Question: A bottle of Gatorade has a volume of 591 mL. What is this volume in L? Question: If the density of a certain alcohol is 0.785 g/mL, what volume of the alcohol would have a mass of 75.0 g? Question: An ice cube will sink in hexane, but float in water. Place these three Question: The nucleus of a particular atom contains 25 protons. The chemical symbol of this atom must be: Question: The number of protons and neutrons in an atom of bromine-81 is: Question: What is the mass number of an element that contains 4 protons and 5 neutrons? Question: The figure shows a molecular-level diagram of the chemical reaction between hydrogen and nitrogen to form ammonia (white atoms are H atoms and blue atoms are N atoms). What is wrong with this diagram Question: Which of the following is the same for isotopes of an element? Question: You are a medical professional. One winter, a patient whom is allergic to pollen comes in complaining of allergies. Since it is winter, you expect that this patient has not been exposed to pollen recently and you hypothesize that this patient is allergic to animal dander. Design an experiment to test this hypothesis (assume you have access to any material you require). Include your control(s) (1 pts) and your experimental design (3 pts). Predict the experimental results that would support your hypothesis. (1 pts) Show Less