4- explicar as mudanças de estados fisicos da materia
6- definir e exemplificar:
-ligações iônicas ou eletrovalente
-ligações covalentes ou molecular
7-definir substancias puras e suas clasificações
8-definir e exemplificar misturas homogeneas e heterogeneas
9-citar, definir e exemplificar misturas homogeneas e heterogêneas
10-definir e exemplificar acidos, bases, sais e oxidos
11-explicar e exemplificar como se faz balanceamneto de equações

2pos suppose an object in free fall is dropped from a building. its starting velocity is 0 m/s. ignoring the effects of air resistance, what is the speed (in m/s) of the object after falling 3 seconds? give your answer as a positive decimal without units. answer here

One way in which the useful metal copper is produced is by dissolving the mineral azurite, which contains copper(ii) carbonate, in concentrated sulfuric acid. the sulfuric acid reacts with the copper(ii) carbonate to produce a blue solution of copper(ii) sulfate. scrap iron is then added to this solution, and pure copper metal precipitates out because of the following chemical reaction: (s) (aq) (s) (aq) suppose an industrial quality-control chemist analyzes a sample from a copper processing plant in the following way. he adds powdered iron to a copper(ii) sulfate sample from the plant until no more copper will precipitate. he then washes, dries, and weighs the precipitate, and finds that it has a mass of .

The bone of a dinosaur and the imprint of a leaf are examples of which kind of fossils? a) index b) body c) amber d) trace