Answer:
Size of the nucleus of an atom is very small as compared to the size of the atom.
According to Rutherford gold foil experiment, nucleus is very small in size as compared to the size of the atom as a whole. Nucleus is very hard, dense and positively charged which consists of protons and neutrons.
Explanation:
Answer:
a. Exotérmica
b. Exotérmica
c. Endotérmica
Explanation:
- Las reacciones exotérmicas son aquellas que liberan calor al ambiente. Como consecuencia la temperatura final del sistema aumenta. Podemos reconocerlas porque el calor aparece como un producto.
- Las reacciones endotérmicas son aquellas que absorben calor del ambiente. Como consecuencia la temperatura final del sistema disminuye. Podemos reconocerlas porque el calor aparece como un reactivo.
a. La combustión del propano:
C₃H₈ (g)+ 5 O₂(g) ⇒ 3 CO₂(g) + 4 H₂O(g) + 531 kcal
La reacción es exotérmica por lo que el calor aparece como producto.
b. La formación de la sal de mesa:
2 Na(s) + Cl₂(g) ⇒ 2 NaCl(s) + 196 kcal
La reacción es exotérmica por lo que el calor aparece como producto.
c. La descomposición del pentacloruro de fósforo:
PCl₅(s) + 16 kcal ⇒ PCl₃(s) + Cl₂(g)
La reacción es endotérmica por lo que el calor aparece como reactivo.
Answer:
107.73KPa
Explanation:
Data obtained from the question include:
T1 (initial temperature) = 300K
P1 (initial pressure) = 101KPa
T2 (final temperature) = 320K
P2 (final pressure) =?
Using the the equation P1/T1 = P2/T2, the final pressure (i.e the new pressure) of the gas can be obtained as follow:
P1/T1 = P2/T2
101/300 = P2/320
Cross multiply to express in linear form as shown below:
300 x P2 = 101 x 320
Divide both side by 300
P2 = (101 x 320)/300
P2 = 107.73KPa
Therefore, the new pressure of the oxygen gas is 107.73KPa
Its simple, just make a chart. You start off with 700.0g of Iodine in time of 0 days. You want to divide that number by 2 (cause its the half - life). That number will represent 8 days. Divide the x grams of Iodine again, and you will get the half life of 16 days. Keep on doing that until you get 43.75 grams. Use a calculator if you need to.