O metano, a amônia, a água e o fluoreto de hidrogênio são substâncias moleculares cujas estruturas de Lewis se representam na tabela seguinte.

Metano, CH 4 Amônia, NH 3 Água, H 2 O Fuoreto de hidrogênio,

HF

Indica o tipo de ligação que se estabelece entre os átomos que constituem estas moléculas.

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)

How does a large body of water, such as the ocean, influence climate?

How many moles are contained in 5.6 l of h2 at stp