Based on the picture, 1. What represents the plates? 2. What represents the mantle? 3. Where is the heat source? 4. Why are the blocks of wood floating? 5. Which part of the water has a greater density? Lesser density? 6. Explain convection current

b) qual é o número de valência dos elementos?

13 gás hidrogênio reage com gás cloro produzin- do ácido clorídrico. Ao reagir 10 g de hidrogênio com 500 g de cloro, houve formação do produto ácido, mas observou-se que 145 g de cloro per- maneceram sem reagir. Qual será a massa, em gramas, do ácido clorídrico formado? Justifique

2) En un alto horno se procesa un óxido de Hierro con Antracita (Carbono) para producir Arrabio (Hierro Fundido). Las reacciones estequiométricas son reacciones consecutivas: A) \( \mathrm{FeO}+\mathrm{CO} \longrightarrow \mathrm{CO}_{2}+\mathrm{CO} \) B) ¿Cuánto Oxido Ferroso se necesita para producir 180 kg de Hierro? b) ¿Cuánto Carbono se habrá consumido si al final del proceso se generaron 400 kg de Dióxido de Carbono?

All the following aims to get iron ore used in red pigments except: (Exam \( 1 \mathrm{L2} \mathbf{~ C h} 2 \) ) a) Thermal decomposition of iron salt produced from reacting diluted \( \mathrm{H}_{2} \mathrm{SO}_{4} \) with black iron oxide b) Heating of yellowish grey ore strongly in air c) heating Iron II hydroxide above \( 200^{\circ} \mathrm{C} \) d) Oxidation of black iron oxide

An iron ore ( X ), 2 elements ( \( Y \) and Z ) from this ore are used in making 2 types of alloys, if you know that element \( Y \) is a source of reducing agent in blast furnace, which of the following is true about element ( z ) and iron ore \( (\mathrm{X} \) ) respectively? (Exam \( 1 \mathrm{L2} \mathbf{C h} 2 \) ) a) \( Z \) has highest magnetic moment in oxidation state +2 , while \( X \) is paramagnetic b) \( Z \) has highest magnetic moment in oxidation state +3 , while \( X \) is thermally decomposed in air giving a black oxide c) \( Z \) is not considered as a transition element, while \( X \) is thermally decomposed in absence of air giving a black oxide d) \( Z \) forms paramagnetic compounds in most of it's oxidation states, while \( X \) requires roasting before reduction