A teacher asks her students to create a model of methane (CH4). She gives them a collection of red, blue, and black beads to build their model.
Molecular Model Key
Matertal What Material Represents
Red bead One hydrogen atom
Blue bead
One oxygen atom
Black bead One carbon atom
How many of each color bead will students need to create a model of a molecule of methane (CH4)? Move the number of beads needed to
the correct spaces in the table.

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Which statement is best described as a atom

Given the following at 25c calculate delta hf for hcn (g) at 25c. 2nh3 (g) +3o2 (g) + 2ch4 (g) > 2hcn (g) + 6h2o (g) delta h rxn= -870.8 kj. delta hf=-80.3 kj/mol for nh3 (g), -74.6 kj/mol for ch4, and -241.8 kj/mol for h2o (g)