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Name all 3 elements in the following chemical formula H 2 SO 4

Name all 3 elements in the following chemical formula H 2 SO 4. How many total atoms are in the compound Ca (NO 3 ) 2 ? A. 3 B. 5 C. 7 D. 9. Give an example of a physical change. Balance the following equation: C 3 H 8 + O 2  3CO 2 + 4H 2 O. 5. Chemical reaction.

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Name all 3 elements in the following chemical formula H 2 SO 4

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  1. Name all 3 elements in the following chemical formula H2SO4

  2. How many total atoms are in the compound Ca(NO3)2? A. 3 B. 5 C. 7 D. 9

  3. Give an example of a physical change

  4. Balance the following equation: C3H8 + O2 3CO2 + 4H2O 5

  5. Chemical reaction Fill in the concept map with the clues to a chemical reaction.

  6. Which of the following correctly identifies the law of conservation of mass? • +  + • +  + • +  • +  +

  7. Lithium has properties most similar to which of these elements? A. Potassium B. Beryllium C. Calcium D. Chromium

  8. How many elements are in Na2CO3? A. 2 B. 3 C. 7 D. 14

  9. 2H2+ O2 ? In the chemical equation, the elements are rearranged to form new products. Which of the following compounds should be placed in the box? A. HO2 B. 2H2O C. H2O D. HCl2

  10. Give an example of a chemical change.

  11. A substance that is used to speed up a chemical reaction is called a(n) • catalyst. • reactant. • inhibitor. • precipitate.

  12. A ______________ is a chemical substance consisting of two or more different elements. compound

  13. subscript The 3 in the following chemical formula is called a ____________. 2FeCl3

  14. Which of the following is an example of a chemical property? • Texture • Weight • Flammability • Hardness

  15. According to the following chemical equation, how many reactants are needed to form water and carbon dioxide? H2CO3H2O + CO2 A 1 B3 C2 D 4

  16. Match the clue to the appropriate example. a. color change b. energy change c. solid formation d. gas formation • Thermal energy given off by a fire • Precipitate • Bubbles • White spots caused by bleach

  17. Write the chemical formula for Sodium chloride.

  18. When carbon reacts with oxygen to form carbon dioxide, carbon dioxide is the _____________. product

  19. Why can’t the subscripts in chemical formulas be changed when you balance equations?

  20. Which of the following is a diatomic element? (element always found in pairs or bonded to another element) • Sodium • Magnesium • Oxygen • Helium

  21. coefficient The 3 in this chemical formula is called a ______________. 3O2

  22. When two colorless solutions are mixed, a yellow precipitate forms. Which of the following statements about this change is false? • The precipitate is a newly formed product. • New chemical bonds were formed. • A chemical reaction occurred. • The new substances have the same properties as the reactants.

  23. The coefficient 2 in 2CO2 means that there are • two oxygen atoms and one carbon atom present. b. two oxygen atoms present. c. two carbon atoms and two oxygen atoms present. d. two carbon dioxide molecules present.

  24. State the law of conservation of mass.

  25. Which of the following equations does not demonstrate the law of conservation of mass? • 2Na + Cl2 2NaCl • NaOH + HCl  NaCl + H2O • P4 + 5O2  2P4O10 • SnCl2 + 2FeCl3  2FeCl2 + SnCl4

  26. Chemical reactions do not produce different substances. True or False?

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