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Paramagnetism: Compounds Vials of a number of compounds (NaCl, MnSO4, FeSO4, CoCl2, NiSO4, ZnSO4, K4Fe(CN)6, [Co(NH3)6]Cl3, [Ni(NH3)6]Cl2, and H2O) are hung from a thread. When a magnet is brought near, some of the vials are attracted.
Magnetic Properties |
Atomic Properties / Structure
Paramagnetism: Oxidation States of Manganese Manganese(III) oxide, with 4 unpaired electrons per Mn atom, is more strongly attracted to a magnet than is manganese(IV) oxide, with only 3 unpaired electrons per Mn atom. Potassium permanganate, a compound of Mn(VII), has no unpaired electrons and is not attracted to a magnet.
An incomplete concept map is shown below, which set of terms for A, B, C and D would result in a correct map based on the concept of wave mechanics applied to a hydrogen atom?
The Return of the Black BoxMalka Yayon and Zahava Scherz In this activity, students make indirect observations of a sealed box containing different objects and try to deduce the properties and identities of the unseen contents. Yayon, Malka; Scherz, Zahava. J. Chem. Educ.2008, 85, 541.
Building a Successful Middle School Outreach Effort: Microscopy CampR. Lee Penn, Leslie Flynn, and Page Johnson Microscopy Camp is a middle school outreach program designed to introduce and reinforce concepts regarding the atomic structure of crystals. Students synthesize magnetite nanoparticles and characterize them using light, scanning electron, and high-resolution transmission electron microscopy. Penn, R. Lee; Flynn, Leslie; Johnson, Page. J. Chem. Educ.2007, 84, 955.
Crystals A collection of activities that explore basic concepts dealing with crystals and their structure. They are written for the 4-6th grade level.
Crystals / Crystallography
Ice Crystals Extraordinaire - Snowflakes Snowflakes are examples of crystal formation. As water freezes in snowflakes it creates intricate symmetrical patterns. In this activity students create paper snowflake models with similar symmetrical patterns. Students also use recrystalized salt to decorate the surface of their snowflakes.
Crystals / Crystallography
Recrystallizing Crystals In this hands-on activity, which is part of the ACS-Science for Kids collection, students explore some of the properties of crystals. Students create saturated solutions of solids and watch them recrystallize as they dry.
