Chemistry, 02.10.2019 22:00 ezellcarly
Iknow there are 4.5*10^-9 seconds in 4.5 nanoseconds, but when i enter it into my ti-30xiis, i get 4.5*10^-10. i enter it as 4.5 * (1/10^9) in my calculator what am i doing wrong?
Answers: 1
Chemistry, 22.06.2019 03:10
Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.
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Chemistry, 22.06.2019 11:40
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) â 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.)
Answers: 1
Chemistry, 22.06.2019 12:30
Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?
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Iknow there are 4.5*10^-9 seconds in 4.5 nanoseconds, but when i enter it into my ti-30xiis, i get 4...
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