Answer:
Hot to cold
Explanation:
Unless people interfere, thermal energy or heat naturally flows in on direction only: hot towards cold. Heat moves naturally by any of three means. The processes are known as conduction, convection, radiation. Sometimes more than one may occur at the same time.
Answer:
0.204 mol
Explanation:
Step 1: Write the balanced equation for the heating of calcium chloride dihydrate
CaCl₂.2H₂O ⇒ CaCl₂ + 2H₂O
Step 2: Calculate the moles of calcium chloride dihydrate
The<em> molar mass of CaCl₂.2H₂O</em> is 147.01 g/mol. The moles corresponding to 15.0 g of CaCl₂.2H₂O are:
Step 3: Establish the molar ratio of CaCl₂.2H₂O to H₂O
According to <em>the balanced equation</em>, the molar ratio of CaCl₂.2H₂O to H₂O is 1:2.
Step 4: Use the molar ratio to calculate the moles of water produced from 0.102 moles of calcium chloride dihydrate
Chlorine's electron affinity value is more negative than the electron affinity value of bromine.
The first electron affinity of an element measures the energy change when one mole of electrons are added to one mole of the atom under gaseous state. A negative electron affinity value indicates a release of energy whereas a positive value corresponds an input of energy.
Both chlorine and bromine are nonmetal elements near the right end of a modern periodic table and would release energy on the addition of the first electron to their neutral atoms. The exact quantity of energy released is dependent on the atom's attraction on an additional electron. Chlorine is found in the third period of the periodic table. Bromine is located one period underneath chlorine and would have one more occupied valence shell than chlorine does. Both elements have a effective nuclear charge of +7 as group seven elements, whereas with one less occupied layer of electrons, the separation between the center of the positive charge in a chlorine atom and the extra electron would be smaller than that in a bromine atom. Chlorine atoms thus pose a stronger attraction on electrons added and release more energy than bromine does. The first electron affinity value of chlorine is thus more negative than that of bromine.
B. Beta decay
Beta decay occurs when a high-speed electron is lost from the atom, converting one of the atom's neutrons into a proton. The mass number of the atom then remains the same but its atomic number is increased by one.
This is the decay taking place because the transition from carbon-14 to nitrogen-14 involves an increase in atomic number by 1.
<span />
