Category: First Five

Problems and writing prompts used to start my Chemistry class. The focus is on review of essential concepts.

First Five for December 5

Assume that circle “A” represents the radius of an atom of chlorine. Which circle might represent an atom of bromine? Which circle might represent a chloride ion? Which circle might represent an atom of fluorine?  

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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

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First Five for November 29 and 30

Put these elements in order of increasing atomic radius: Potassium (K), Cesium (Cs), Sodium (Na), Lithium (Li), Hydrogen (H) Tellurium (Te), Oxygen (O), Selenium (Se), Sulfur (S)  

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First Five for November 28

A particular atom has eight protons, eight electrons and ten neutrons. Answer the following questions about this atom: What element is this? What is the mass number of the element? How many valence electrons does this atom have? What is

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First Five for November 17 and 18

Classify each of the following elements as an alkali metal, alkaline earth metal, halogen, noble gas, transition metal, nonmetal or metalloid. silicon (#14) rhodium (#45) chlorine (#17) cesium (#55) argon (#18) strontium (#38) oxygen (#8) 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?

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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.

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First Five for November 3 and 4

Identify each of the following elements: The element having the electron configuration 1s22s22p63s23p3 The noble gas in the fourth period of the table The element that has only one electron in the third shell The largest alkaline earth metal

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First Five for November 1 and 2

Analyze the following lists of elements: oxygen (O), fluorine (F), neon (Ne) titanium (Ti), nitrogen (N), radon  (Rn) sodium (Na), potassium (K), cesium (Cs) Determine which list contains elements that are most closely related in chemical properties. Explain how you

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First Five for October 31

Use a periodic table to determine the number of electrons that each of these elements has in its outermost energy level: sodium carbon sulfur phosphorus argon magnesium

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