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Chemistry - Mid Term Exam Review Sheet #1 The midterm exam covers chapters 1 - 8 & 10. You should read through each chapter, look over old tests you still have, answer the following questions and do the calculations in order prepare yourself for the mid-term. 1. Define the following terms and describe where each is located. proton - _____________________________________________________________________________ neutron - _____________________________________________________________________________ electron – _____________________________________________________________________________ 2. Complete the following table: Element name Atomic # Hydrogen Mass # # of protons # of Neutrons # of Electrons Symbol Carbon Sodium Calcium Fe 3. Define the following and give an example of each using chemical symbols. atomic number _______________________________________________________ / __________________________ atomic mass _______________________________________________________ / __________________________ isotope _______________________________________________________ / __________________________ 19 20 19 4. Which of the following are isotopes of the same element? 9Y 9Y 10Y 5. Describe Rutherford's experiment: ___________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ 6. Explain all the major parts of Dalton's Atomic Theory. a. b. c. d. 7. Balance the following chemical equations: 3 CO + _____ Fe2O3 2 Fe 3 Zn(OH)2 + 2 H3PO4 _____ Zn3(PO4)2 + 3 CO2 + 3 H2O 8. Define Ionic and Molecular compounds, and tell how each is formed. a. Ionic: oppositely charged particles creation bonds that are formed when electrons transfer b. Molecular; Bonds formed when atoms share electrons to complete their valence level 9. Name the following compounds and state if it is ionic or molecular in nature: a. Al(OH)3 aluminum hydroxide - ionic b. N2O5 dinitrogen pentoxide - molecular c. MgI2 magnesium iodide - ionic d. Cl2O7 dichlorine heptoxide 1 Chemistry - Mid Term Exam Review Sheet #1 10. Write a chemic al formula for each name given and tell whether it is an ionic (i) or molecular (m) compound: a. Ammonium Phosphate _______________ (NH4)3PO4 - I b. Magnesium Nitride _______________ Mg3N2 - I c. Oxygen Difluoride _______________ OF2 - M d. Carbon Dioxide _______________ CO2 - M e. Sulfur Dioxide _______________ SO2 - M 11. Name and describe the 6 types of chemical reactions. Give an example of each. a. : smaller species combine into larger ones – 2H2 + O2 2H2O b. Combination Decomposition: larger species breaking down into smaller ones – MgCl2 Mg + Cl2 c. Single replacement: an element and a compound react and create a different element & compound a + bc b + d. Double replacement: Ions from two ionic compounds swap places to make two different ionic compounds e. Usually involve oxygen reacting with a fuel producing H2O & CO2 – CH4 + 2O2 CO2 & 2H2O f. 12. Define and give an example of each: Element _____________________________________________________ / _________________ Mixture _____________________________________________________ / _________________ Compound _____________________________________________________ / _________________ homogeneous substance _____________________________________________________ / _________________ heterogeneous substance _____________________________________________________ / ________________ physical property _____________________________________________________ / _________________ chemical property _____________________________________________________ / _________________ physical change _____________________________________________________ / _________________ chemical change _____________________________________________________ / _________________ qualitative measurements _____________________________________________________ / _________________ quantitative measurement _____________________________________________________ / _________________ 13. Which of the following is a homogeneous mixture? a. oil in water b. soot in water c. alcohol in water 14. Which of the following could be considered a physical change? a. cooking a pancake b. burning a tree c. melting an ice cube 15. Which of the following is considered a heterogeneous mixture? a. salt and sugar b. flour and baking powder c. salt and pepper 16. Classify each as a physical or chemical change. ______ a. instant coffee is combined with hot water to produce a brown liquid Physical ______ b. from exposure to air and moisture, iron turns reddish and cannot conduct electricity Chemical ______ c. iron is heated , turns red and then melts Physical ______ d. sugar is heated to produce steam and a black solid Chemical 2