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## First Five for December 1 and 2

Write the correct formula for each of the following compounds:

• Sulfur trioxide
• Sodium sulfide
• Carbon tetrachloride
• Aluminum chloride
• Diphosphorus pentoxide
• Barium phosphide
Posted in Chemistry, First Five

## First Five for November 29 and 30

### Put these elements in order of increasing atomic radius:

2. #### Tellurium (Te), Oxygen (O), Selenium (Se), Sulfur (S)

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## First Five for November 28

5. ### What is the formula and name of the ion that this atom forms?

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## First Five for November 17 and 18

• ### chromium (#24)

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## First Five for November 15 and 16

### Identify the missing particle in the following reaction. What type of decay is taking place?

$_{6}^{14}\textrm{C} \to\; _{7}^{14}\textrm{N}\; +$

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## First Five for November 14

### Oxygen is a gas at normal conditions. Scientists report that oxygen is the most common element in the earth’s crust. The earth’s crust is composed of solids and liquids. Explain this apparent contradiction.

Posted in Chemistry, First Five

## First Five for November 3 and 4

### Identify each of the following elements:

4. #### The largest alkaline earth metal

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## First Five for November 1 and 2

### Determine which list contains elements that are most closely related in chemical properties. Explain how you are able to determine which list is most closely related chemically.

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## First Five for October 31

6. ### magnesium

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## Write balanced formulas for each of the following ionic compounds:

magnesium fluoride  __________________

iron(III) oxide ___________________

sodium sulfide ___________________

copper(II) nitride _________________

aluminum bromide _________________

Posted in Chemistry, First Five