Demuestre que tan buenas son las aproximaciones de 1/3 km/s y 1/5 mi/s para referirse a la rapidez del sonido. Considere condiciones de temperatura ambiente y aire seco(20°C). a) Determine el porcentaje de error de cada una. B) Suponga que ocurre una tormenta con relámpagos en un día muy caluroso con una temperatura de 38°C y aire seco. ¿Los porcentajes de error en el ejemplo aumentan o disminuyen?Justifique su respuesta. Rta: 333m/s, 322 m/s, b) 2.9%, 6.1%

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

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explanation:

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o