Topic
Q:
Step half-life of nitrogen-13 is approximately 9.97 minutes. 3 : How much of a 3 gram sample of nitrogen- 13 would remain after 5 minutes? Round to three decimal places.
Q:
The half-life of nitrogen-13 is approximately 9.97 minutes.
Step 2 of 3 : How much of a 3 gram sample of nitrogen- 13 would remain after 8 minutes? Round to three decimal places.
Q:
The halflife of silver 105 is approximately 41.3 days.
Step 3 of 3 : How much of a 12 gram sample of silven- 105 would remain after 54 days? Round to three decimal places.
Q:
The half-life of silver-105 is approximately 41.3 days.
Step 2 of 3 : How much of a 12 gram sample of silver-105 would remain after 57 days? Round to three decimal places.
Q:
4. Kuris teiginys yra teisingas?
I. \( \mathrm{C}_{4} \mathrm{H}_{8} \) ir \( \mathrm{C}_{3} \mathrm{H}_{8} \) yra izomerai.
\( \begin{array}{llll}\text { II. Bendroji formulè } \mathrm{C}_{\mathrm{n}} \mathrm{H}_{2 n-2} \text { tinka tik alkadienams. } \\ \text { A abu neteisingi } & \text { B teisingas tik I } & \text { C teisingas tik II } \quad \text { D teisingi abu }\end{array} \)
Q:
Draw resonance structures for each of the follewing
molecules or ions:
a. \( \mathrm{ClNO}_{2} \) ( N is the central atom)
Q:
3-Qual o periodo que está loćalizado o elemento tálio \( (\mathrm{Ta}) \) ?
\( \begin{array}{llll}\text { a) } 3 & \text { b) } 4 & \text { c) } \cdot 5\end{array} \)
Q:
3. Susidarant \( \pi \) ryšiui etilene dalyvauja:
\( \begin{array}{ll}\text { A } 1 p \text { ir } 2 s \text { elektronai } & \text { C nehibridiniai } p \text { elektronai } \\ \text { B } s p^{2} \text { hibridinés orbitalés } & \text { D du } s \text { elektronai }\end{array} \)
Q:
2. Os elementos são organizados tabela periódica pela ordem crescente de.
\( \begin{array}{llll}\text { a) número atómico } & \text { b) Massa atômica } & \text { c) Grupos } & \text { d) periodo }\end{array} \)
Q:
Resolver problemas
5 5. Aplicación. El punto de fusión de una
sustancja es la temperatura a la cual cambia
de estado sólido a líquido y el de ebullición
en el que cambia de líquido a gaseoso. El
punto de funsión del alcohol es \( -1144^{\circ} \mathrm{C} \) y el
de ebullición es \( 788^{\circ} \mathrm{C} \). ¿Cuántos grados debe
aumentar el alcohol para pasar de su punto
de fusión al de ebullición?
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