Chemistry Midterm_Revised_Student_Version_11_2016.docx

Chemistry Midterm_Revised_Student_Version_11_2016.docx -...

This preview shows page 1 out of 5 pages.

Chemistry Mid-term Exam Version 11/2016 Name: Skylar Bryson Student number: JM1405232 Directions: It is important that you provide answers in your own words. Please focus only on information from the text/eBook to create your own solutions. Please do not use direct infor- mation from an outside source (especially copying and pasting from an “answer” website). Use of direct information from an outside source is against school policy. All answers will be checked for plagiarism. Instances of plagiarism can result in probation or possible dismissal from the school. Please be sure to follow all guidelines (number of sentences/showing all calculations) and to provide the correct metric units of measure. All questions are 3.33 points (.33 point for units). 1. Experimental Design: From the work you have done this semester, choose a topic and design an experiment you would be able to perform. In your design (1) state your hy- pothesis, (2) identify your dependent and (3) independent variables, (4) your control conditions and (5) describe your experimental procedure. You do NOT have to actually complete the experiment, just describe it with the application of the terms above. Hypothesis: when the fork is dipped into the baking soda and water, it will clean off the dirty stuff on it independent variable: water            dependent variable: fork            control conditions: baking soda            experimental procedure: fill a cup with hot water and add two tablespoons of bak- ing soda(sodium hydrogen carbonate{NaHCO3}). Next, crush the aluminum foil into a  loose ball and place it in the beaker. After,make a note of what the fork looks like before then place it in the beaker so that it is touching the aluminum ball. Allow the beaker to  stand undisturbed for 30 minutes. Finally, remove the fork and aluminum ball and rinse  them with water. Put down the changes to the fork . 2. Perform this operation and report the answer to the correct number of significant fig- ures : What is the mass of a cube of aluminum that is 4.0 cm on each edge? The density of aluminum is 2.7 g/cm 3 . Show all calculations leading to an answer. Mass = density(g/cm3) x volume(cm3) mass = 2.7g/cm3 x 4^3cm3 = 2.7 x 64g = 172.8g 3. Explain why a model of the atom is crucial to understanding chemistry and in explaining
Image of page 1
You've reached the end of this preview.
  • Winter '17
  • Dr. Tami Johnson
  • Chemistry

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern