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Write the chemical formula for a compound made from hydrogen and sulfur. Name the compound. Formula  [joe7] Name  [joe8] c. Is it an ionic or molecular compound?  [joe9]

The Lewis structure indicates that methane assumes a tetrahedral molecular shape. Why is this true?

Write the chemical formula for a compound made from sodium and the phosphate polyatomic ion. Name the compound. Formula  [red8] Name  [red9] Is it an ionic or molecular compound?  [red10]

Classify each of the following as a pure substance or a mixture. Fluorine (used to make fluorides, such as those used in toothpaste) [blu8] Toothpaste  [blu9] Calcium fluoride, CaF2, from the naturally occurring ore fluorite. [blu10]

Write the chemical formula for a compound made from calcium and nitrogen. Name the compound. Formula  [joe4] Name  [joe5] Is it an ionic or molecular compound?  [joe6]

Regarding solutions, which statement is not true?

The derived unit for volume is much too large for practical use in many cases so it has been divided into smaller increments. Which unit below is not a unit of volume?

Hydrogen (mass number 1) sits next to helium (mass number 2) on the periodic table. Which statement below is not true?

An element is in group 14 and period 5. Answer the following: Name the compound [ans1] Give its symbol   [ans2] Is it metal, non-metal, or semi-metal? [ans3] Would this element be malleable? [ans4]

Elements are made up of atoms. Atoms are made up of protons, neutrons, and electrons. Which component of the atom has the least mass?