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$KINDERGARTEN EVERYDAY MATH – BASELINE RUBRIC$

Write the group # the ions are in on the periodic table Sodium Fluoride Fill in the following chart based on the steps for writing chemical formulas. Charges the Ions will have Drawing of puzzle pieces for cations and anions Total Charge for each element Balanced Formula for this compound Na F Na F Gain e - / lose e - Gain e - / lose e - and how many and how many Copper II Oxide Cu O Cu O Gain e - / lose e - Gain e - / lose e - and how many and how many Potassium Nitride K N K N Gain e - / lose e - Gain e - / lose e - and how many and how many Calcium Phosphide Ca P Ca P Gain e - / lose e - Gain e - / lose e - and how many and how many
Writing Chemical Formulas—Criss Cross Method Now that we have looked at how compounds trade electrons, wouldn’t it be nice if there was a quicker and simpler way of determining the formula that does not involve puzzle pieces? Relax—there is!! It is called the “criss-cross” method. Here’s how it works. 1. Look at the name and determine the ions in the compound by looking at their placement in the periodic table or the Table of Common Oxidation Numbers on the back of the periodic table you were given. The cation ion (positive ion) is written first, then the anion (negative ion). 2. Write the ion symbol, and then write the oxidation number of the ion to the upper right of the symbol. You’ll find the oxidation number listed at the top of each column. 3. Draw a box around the oxidation number. The box will make life easier for you later! 4. Now, look at the two oxidation numbers. If they add up to zero, you are done. Just re-write the symbols of the ions without the oxidation numbers (remember to write the cation first, then the anion). 5. If the two oxidation numbers don’t add up to zero, take the oxidation number of the cation (without the + sign) and place only the number as a subscript after the anion. Now take the oxidation number of the anion (without the - sign) and place only the number as a subscript after the cation. Re-write the symbols of the ions this time without the oxidation numbers. If the subscript is a one (1) you do not need to write it down. Sometimes, these ions themselves are made of more than one atom or element. We called these ions polyatomic (many atoms). Treat them as a single ion. Whenever you write a polyatomic ion, always put the entire ion in parenthesis. If you need a subscript, write it outside the parenthesis. 1. sodium chloride Na Cl Add the charges: +1 + -1 = 0 done Write the Formula: NaCl 2. magnesium phosphide Mg P Add the charges: +2 + -3 = -1 go to step 5 & criss cross Write the Formula: Mg 3 P 2 (notice the subscripts) 3. zinc sulfide Zn S Add charges: 4. copper II fluoride Cu F Add charges: Elements in the d and f blocks can have more than one oxidation number. We use roman numbers to indicate the oxidation number: Examples: Cu I is +1, and Cu II is +2
Page 1 and 2: Learning Goals Unit 4: Copper lab,
Page 3 and 4: SECOND DAY We will continue working
Page 5 and 6: Observations before reaction Observ
Page 7 and 8: Next reaction 3) Put a pre-cut piec
Page 9 and 10: 1) Percent recovery is a term used
Page 11: Describe with words any observed pa
Page 16 and 17: Practice Writing Formulas with the
Page 18 and 19: Practice makes perfect! The third r
Page 20 and 21: Naming chemical compounds Now that
Page 22 and 23: It is your turn to practice. The fo
Page 24 and 25: Identification of elements, ions an
Page 26 and 27: Chemical Change Lab - Five Fabulous
Page 28 and 29: 3. How many products are present an
Page 30 and 31: What type of reaction is this? Ther
Page 32 and 33: Practice identifying types of react
Page 34 and 35: B. Heating of a metallic chlorate:
Page 36 and 37: compound1 + compound2 Compound3 + c
Page 38 and 39: 3. The reaction of hydrogen and nit
Page 40 and 41: Follow the instructions for previou
Page 42 and 43: Types of Reactions Combination: A +
Page 44 and 45: Decomposition subtypes When there i
Page 46: 6. Describe how to use gravity filt

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