Warm Up – 2/15-16/17

Using the Stoich-Limiting lab instructions, write the balanced chemical equations for the two possible reactions of copper(II) sulfate with iron metal.

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Warm Up – 2/10-14/17

  1. Balance the combustion of C2H5OH(aq).
  2. Show that the equation you balanced obeys the law of conservation of mass.
  3. You have 225.5 grams of C2H5OH(l).
    1. How many moles do you have?
    2. How many moles of oxygen gas do you need?
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Warm Up – 1/31 – 2/1/17

  1. 85.25 g calcium hydroxide mixes with aqueous hydrochloric acid (HCl) to make aqueous calcium chloride and water.
    1. Write the balanced equation including states of matter.
    2. Determine the type of chemical reaction.
    3. Convert the mass of calcium hydroxide to moles.
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Warm Up – 1/25-26/17

A) Convert the following:

  1. 274.55 g sodium chloride to moles
  2. 3.88 x 1024 atoms iron to grams.

B) Chromium metal reacts with oxygen gas to produce chromium(III) oxide.  Write the word equation, formula equation, and balance it.

 

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Warm Up – 1/19-20/17

Convert the following:

  • 42.86 g calcium to atoms
  • 285.2 L of carbon dioxide gas to moles
  • 2.05 moles copper(II) chloride to grams

The mass of the empty crucible and lid was 28.25 g.  The mass of the crucible, lid, and copper(II) sulfate pentahydrate was 30.21 g.  The mass of the crucible, lid and anhydrous salt was 29.52 g.  Determine the following:

  1. The mass of the hydrate.
  2. The mass of water lost.
  3. The percent of water lost.
  4. The Error in both mass and percent.
  5. The Percent Error based on mass and percent.
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Warm Up – 1/17-18/17

  1. A Hydrate is a substance that has a water molecule added to it.  A Prefix is used to show how many molecules of water there are. Determine the Molar Mass of Copper(II) Sulfate Pentahydrate.
  2. Determine the percent by mass of each element in water.
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Warm Up – 1/12-13/17

  1. What is the formula mass of:
    1. Sodium Chloride
    2. Water
    3. Sodium Sulfite
    4. Copper(II) Sulfate
  2. What is the definition of Molar Mass?
  3. How many atoms are in 5.25 moles of sodium sulfite?
  4. How many moles are in 2.86 grams of copper(II) sulfate?
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Warm Up – 1/10-11/17

Happy New Year!

  1. What are 3 good class “rules” that we should all remember?
  2. List 4 things your Homework should contain? (Hint: your name is one!)
  3. Describe how to properly submit work using Google Classroom.
  4. Convert the following:
    1. 542 inches to cm (1 inch = 2.54 cm)
    2. 1.85 mg Calcium Chloride to kg.  Include formula and unit in answer.
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Warm Up – 12/14-15/16

  1. What is the definition of Melting Point?
  2. Describe the differences in melting points for ionic and covalent substances.
  3. Which ones would you expect to be a solid at room temperature: CO, NaI, NO2, CaCl2?
  4. What do molecular formulas tell you?  Provide an example with details to help explain.
  5. Draw 2D LDS and VSEPR for SCl2, PF3, CH3CH2CH2OH and the acetate ion.
  6. Draw all possible resonant structures for HN3 (hint: the 3 N atoms are bonded in a row).
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Warm Up – 12/2-5/16

Draw the Lewis Dot Structure in 3D (VSEPR) and label the angle and shape:

  1. NI3
  2. H2O
  3. CI3F
  4. Carbonate Ion
  5. SeO2
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