Calcium is Ca, Carbon is C, Chlorine is Cl
The answer is C
Answer:
Semiconductors are poor conductors at low temperatures, but their resistance decreases with increasing temperature.
Explanation:
A semiconductor can be defined as a crystalline solid substance that has its conductivity lying between that of a metal and an insulator, due to the effects of temperature or an addition of an impurity. Semiconductors are classified into two main categories;
1. Extrinsic semiconductor.
2. Intrinsic semiconductor.
The statement which best describes the electrical conductivity of metals and semiconductors is that semiconductors are poor conductors at low temperatures, but their resistance decreases with increasing temperature.
This ultimately implies that, semiconductors are typically an insulator (poor conductor) at low temperatures and a good conductor at high temperatures.
Additionally, conduction involves the transfer of electric charge or thermal energy due to the movement of particles. When the conduction relates to electric charge, it is known as electrical conduction while when it relates to thermal energy, it is known as heat conduction.
A 0.12 M solution of an acid that only slightly ionizes in solution would be termed a weak acid. Weak acids are acids which do not completely dissociate in water. Thus lowering the presence of hydronium ions which measures the pH of an acid. <span />
Answer:
3 g
Explanation:
Concentration of copper nitrate needed = 30 g/dm³
Volume of water = 100 cm³ = 0·1 dm³
( ∵ 1 dm³ = 1000 cm³)
Let the mass of copper nitrate that should be added to 100 cm³ water be m g
m ÷ 0·1 = 30
∴ m = 3 g
∴ Mass of copper nitrate that should be added to 100 cm³ of water = 3 g
