Answer:
B
Explanation:
Particles in a solid have fixed locations in a volume that does not change. Solids have a definite volume and shape because particles in a solid vibrate around fixed locations.
Answer: d)endothermic with a positive entropy change
Explanation:
Endothermic reactions are those in which heat is absorbed by the system and exothermic reactions are those in which heat is released by the system.
Entropy is the measure of randomness or disorder of a system. If a system moves from an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.
As temperature of water decreases on dissolution of , it means heat has been absorbed by during dissolution and that heat is taken from water. Thus process is endothermic. As dissolution will lead in the formation of ions and , randomness will increase and thus there is a positive entropy change.
Answer:
no electric charge
Neutron, neutral subatomic particle that is a constituent of every atomic nucleus except ordinary hydrogen. It has no electric charge and a rest mass equal to 1.67493 × 10−27 kg—marginally greater than that of the proton but nearly 1,839 times greater than that of the electron.
Explanation:
Answer:
Mr(CO2) = 12+2(16)= 44g/mol
Explanation:
In CO2 there are "2" oxygen and 1 carbon. Given the data, we add the molar masses to find the molar mass of the compound but since there are two oxygen, we multiply the molar mass of oxygen by 2 before multiplying.
Iron(III) oxide = Fe₂O₃
Carbon = C
Carbon monoxide = CO
Iron = Fe
Fe₂O₃ + C ⇒ CO + Fe
These are the correct formulas, but the equation is not balanced. There are two Fe's on the left side, so we have to put a 2 in front of the Fe on the right. Also, there are 3 O's on the left but only 1 on the right, so we need to put a 3 in front of the CO; however, this 3 makes it 3 C's on the right, so we balance that off by putting a 3 in front of the C on the left:
Fe₂O₃ + 3C ⇒ 3CO + 2Fe