It is C because the element x must reach an octet by forming covalent bonds; in each bond, it shares 1 electron, and as it needs 2 electrons, it must form 2 bonds;
Answer:
A higher hill will give more potential energy, and a lower hill will give less.
Explanation: Gravitational potential energy is the energy stored in an object based on its height and mass. The potential energy in an object increases as its elevation increases.
Explanation:
One of the most fascinating chemical experiments is the reaction between silver nitrate and copper wire in water. Characterised by fractal-like precipitates, this experiment is a stunning example of a simple redox reaction.
Q. No. 1:
a) Endothermic
b) Exothermic
c) Endothermic
d) Exothermic
Q. No. 2:
a) Exothermic
b) Because heat is on product side (evolved to surrounding).
c)
1400 Kj = was produced by 1 mole of C₂H₄
Then,
2100 Kj = will be produced by X moles of C₂H₄
Solving for X,
X = (2100 Kj × 1 mol) ÷ 1400 Kj
X = 1.5 moles of C₂H₄
d)
3 moles of O₂ produced = 1400 Kj of Heat
Then,
1.5 moles of O₂ will produce = X Kj of Heat
Solving for X,
X = (1.5 mol × 1400 Kj) ÷3 mol
X = 700 Kj of Heat