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Q:
Si el aluminio tiene una masa de \( 27 \mathrm{~g} / \mathrm{mol} \) y el oxigeno de \( 16 \mathrm{~g} / \mathrm{mol} \) ¿cuál es la masa molar del \( \left(\mathrm{Al}_{2} \mathrm{O}_{3}\right)_{2} \)
Q:
La configuración electrónica indica la manera en que se distribuyen los \( e^{-} \)entre los distintos orbítales atómicos, sigulendo el principio de AUFBAU o de construcción, el cual establece que
Q:
State the colour change when excess aqueous sodium hydroxide is added to a solution of methyl orange in acid.
Q:
a) \( 4,5 \mathrm{~L} \) de mezcla con 150 ml de stevia líquida. ( \( \mathrm{R}: 3,33 \% \mathrm{v} / \mathrm{v} \) ) b) 50 ml de agua y 30 ml de perfume (considerar volumenes aditivos). ( \( \mathrm{R}: 37,5 \% \mathrm{v} / \mathrm{V} \) ) c) 76 ml de disolución formados con 13 ml de alcohol y agua. (R: \( 17,10 \% \mathrm{v} / \mathrm{v} \) )
Q:
8. Explain why each of the following pairs is not likely to form an ionic bond. a. chlorine and bromine b. potassium and helium c. sodium and lithium
Q:
Oppgave 4 Gitt følgende stoffer: \( \mathrm{NaCl}(\mathrm{s}), \mathrm{NH}_{4} \mathrm{NO}_{3}(\mathrm{~s}), \mathrm{NH}_{3}(\mathrm{~g}), \mathrm{CH}_{4}(\mathrm{~g}), \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}(\mathrm{l}), \mathrm{O}_{2}(\mathrm{~g}) \) Hvilke av disse stoffene vil løse seg godt i vann og hvilke vil løse seg mindre godt/darrig? Begrunn svaret.
Q:
Calcola la massa molecolare di tre acidi piuttosi comuni: l'acido acetico, \( \mathrm{CH}_{3} \mathrm{COOH} \); l'acido cloridrico, HCl ; l'acido carbonico, \( \mathrm{H}_{2} \mathrm{CO}_{3} \).
Q:
1. (UFJF) Um estudante recolheu 1 litro de soluçåo saturada de sulfato de cobre e, apos deixar o recipiente por uma semana na temperatura ambiente, verificou a presença de cristais de sulfalo de cobre e um volume de soluçäo final de 700 mL . Sabendo-se que a solubilidade do sulfato de cobre é de 22.3 gem 100 mL de água, nessa temperatura, qual a massa (em gramas) de sulfato de cobre precipitada?
Q:
8 Calcola le masse molecolari dei seguenti composti: \( \begin{array}{ll}\text { a) } \mathrm{H}_{2} \mathrm{SO}_{4} & \text { d) } \mathrm{Ca}\left(\mathrm{ClO}_{4}\right)_{2} \\ \text { b) } \mathrm{Mg}_{3}\left(\mathrm{PO}_{4}\right)_{2} & \text { e) } \mathrm{NaOH} \\ \text { c) } \mathrm{HNO}_{3} & \text { f) } \mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}\end{array} \)
Q:
(e) What would be observed when aqueous sodium hydroxide is added to a sample of the aqueous industrial waste until no further change is seen?
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