42 - A água é uma substância vital para a sobrevivência humana. Médicos recomendam o consumo diário de cerca de dois litros de água, já que o corpo perde, aproximadamente, essa
quantidade por meio da respiração, urina e suor. Considerando o consumo diário de 1,8 L de água
por uma pessoa, a quantidade ingerida por ela será de:
A) 18g de moléculas.
B) 180g de moléculas.
C) 0,1 mol de moléculas.
D) 10 mols de átomos.
E) 100 VeST RQ VeSé\YS

What is the maximum number of electrons that an atomic orbital can contain?

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

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.)