Answer:
Cd(s) + 1/2 O₂(g) ⇒ CdO(s) ΔH° = -258 kJ/mol
Explanation:
The standard heat of formation corresponds to the reaction of synthesis of 1 mole of the desired product from the simple substances in their most stable form under standard conditions (1 bar, 25°C). The resulting thermochemical equation is:
Cd(s) + 1/2 O₂(g) ⇒ CdO(s) ΔH° = -258 kJ/mol
Answer:
Pure substances are substances that are made up of only one kind of particles and has a fixed or constant structure. Pure substances are further classified as elements and compounds. An element is a substance that consists of only one type or kind of atom
A binary compound of oxygen with another element is called oxide. An oxide is a binary compound of oxygen and another element. Oxygen combines with metals and non-metals to form respective oxides.
Answer:
False
Explanation:
J. J. Thomson conducted an experiment which lead to the discovery of negatively charged particles only. He took a discharged tube and passed high voltage current through the gas and noticed that some particles from cathode is being emitted. They are fast moving particles and are deviated in the electrical and the magnetic field.
<u>J. J. Thomson did not conclude anything about the positive charge. Hence, the statement is false.</u>