Elements and compounds can be classified based on the units that compose them. E

Question

Elements and compounds can be classified based on the units that compose them. Elements can be divided into atomic elements and molecular elements, while compounds can be divided into molecular compounds (also called covalent compounds) and ionic compounds.

Part A

Classify the substances as atomic elements, molecular elements, molecular compounds, or ionic compounds.

Drag each item to the appropriate bin.

Part B

After conducting an experiment, you isolated four compounds. In trying to identify the compounds, you determine the following:

Using the experimental results given in the table, classify the unknown compounds based on whether they are likely to be(A) ionic or (B) molecular.

Drag the appropriate items to their respective bins.

Unknown 1Unknown 2

Unknown 3,Unknown 4

Ionic compounds, Molecular compounds

Part C

The electronegativity of a bond is the difference between the electronegativity of the two atoms that make up the bond. Using the table of electronegativity values, determine if each bond is nonpolar covalent, polar covalent, or ionic.

Drag the appropriate bonds to their respective bins.

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C?H

Na?Cl

H?H

S?F

Na?F

Br?F

C?F

Br?Br

K?Cl

Nonpolar covalent

Polar covalent

Ionic

Part D

Complete each of the following statements for a molecule of SBr2:

Drag the terms on the left to the appropriate blanks on the right to complete the sentences.

bent (120?),five, two, tetrahedral, three, six, bent (109?), four, linear

trigonal planar, trigonal pyramidal

There are________ electron groups around the central S atom.

The electron-group geometry is_________ .

The number of atoms attached to the central S atom is_______ .

The shape of the molecule is __________ .

Explanation / Answer

PART:A

ATOMIC ELEMENT: Cu and Cd. as they occure in atomic form in nature

MOLECULAR ELEMENT: H2 and Br2. as they occure in molecule form in nature

MOLECULAR COMPOUND: SO2 and HBr. as they formed by attachment of two or more nonmetal by sharing an electron to each other.

IONIC COMPOUND: NaCl and Fe2O3. as they are held together or attached by electrostatic force.

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