Q:
The half-life of Palladium-100 is 4 days. After 24 days a sample of Palladium-100 has been reduced to a
mass of 5 mg .
What was the initial mass (in mg ) of the sample?
What is the mass (in mg ) 8 weeks after the start?
You may enter the exact value or round to 4 decimal places.
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Q:
The half-life of Radium-226 is 1590 years. If a sample contains 200 mg , how many mg will remain after
2000 years?
\( \square \mathrm{mg} \)
Q:
10. Provide the mass for an atom of fluorine: 19
11. Which scientist was credited for confirming Democritus's original claim about the building
blocks of matter?
Q:
jemplo 2: A 10 Co, un gas ejerce una presión de \( 0,95 \mathrm{~atm} \) ¿A qué temperatura
(en grados Celsius) ejercerá una presión de \( 0,75 \mathrm{~atm} \) ?
Q:
Question 37 of 40
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Use the periodic table to select the element in the following list where there is the largedt dirfer ence between
the fourth and fifth ionization energy: Na, Ms. Al. Si. P. Se, and Cl.
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Q:
Ejemplo 2: Una jeringa tiene un volumen de \( 10,0 \mathrm{~cm}^{3} \).
La presión es \( 1,0 \mathrm{~atm} \). Si tapas el extremo para que no
pueda escapar ningún gas, y empujas el vástago,
¿cuál debería ser el volumen final para cambiar
la presión a 3,5 atm?
Q:
Nombre y Apellido: Luna Enrico
1) Formular las reacciones paya obtener el yoduro cobáltico. Dar nombres. -
2) Formular las reacciones para obtener el silicato de iridio (VI). Dar nombres. -
Q:
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Choose the atom with the more exothermic electron affinity in each pair:
a) S or As:
b) P or O:
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Q:
\( Al _ { 2 } O _ { 3 } + H _ { 2 } SO _ { 4 } \rightarrow Al ( SO _ { 4 } ) _ { 2 } + H _ { 2 } O \)
Q:
17. Which of the following best describes a fuel cell?
(12.3)
(a) an electric cell that consumes reactants from
an outside source
(b) an electric cell that converts water into
hydrogen and oxygen
(c) an electric cell that produces fossil fuels
through combustion
(d) an electric cell that relies on heat instead of
chemicals
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