Chemistry, 13.07.2019 09:30, neariah24

How does a sample of helium at 15 °c compare to a sample of helium at 215 k? the helium at 15 °c has a higher average kinetic energy than the sample at 215 k. the helium at 15 °c has lower nuclear energy than the sample at 215 k. the helium at 15 °c has slower-moving atoms than the sample at 215 k. the helium at 15 °c has smaller atoms than the sample at 215 k.

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answered: filzaf9632

The correct answer is: 'The helium at 15 °C has a higher average kinetic energy than the sample at 215 K'.

Explanation:

Average kinetic energy of the helium atom at 15 °C .

Temperature of the gas = T = 15 °C = 288.15 K

Average kinetic energy is determined by formula:

$E_{avg}=\frac{3RT}{2N_A}$

$E_{avg}=\frac{3R\times 288.15 K}{2N_A}$

$E_{avg}=\frac{3\times 8.314 J /mol K\times 288.15 K}{2\times 6.022\times 10^{23}}=5.967\times 10^{-21} J$

Average kinetic energy of the helium atom at 215 K.

Temperature of the gas = T' = 215 K

Average kinetic energy is determined by formula:

$E'_{avg}=\frac{3RT'}{2N_A}$

$E'_{avg}=\frac{3R\times 215 K}{2N_A}$

$E'_{avg}=\frac{3\times 8.314 J /mol K\times 215 K}{2\times 6.022\times 10^{23}}=4.452\times 10^{-21} J$

$E_{avg}E'_{avg}$

The helium at 15 °C has a higher average kinetic energy than the sample at 215 K.Hence, it is the correct option.

answered: Guest

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.

answered: Guest

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.

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How does a sample of helium at 15 °c compare to a sample of helium at 215 k? the helium at 15 °c ha...