Category: First Five

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

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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First Five for October 27 and 28

Write balanced formulas for each of the following ionic compounds: magnesium fluoride  __________________ iron(III) oxide ___________________ sodium sulfide ___________________ copper(II) nitride _________________ aluminum bromide _________________

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First Five for October 25 and 26

The atomic mass of silicon given on our periodic table is 28.09. What is likely the most common isotope of silicon? Explain your reasoning.

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First Five for October 24

Review Write electron configurations for each of the following: A chlorine atom A chloride ion A magnesium atom A magnesium ion

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