Answer:
The US surgeon general's 1964 report declared that smoking cigarettes was linked to cancer .
The average global temperature of the Earth has increased by almost two degrees in the last century.
Explanation:
Science and pseudoscience differs in terms of scientific methods involved in any study. Science deals with the practices and beliefs that undergo a method of scientific study. Pseudoscience is the term associated with the ideas and beliefs that tend to be scientific in nature but they fail in their execution of following the scientific methods.
From the given options, two of them are the examples of science and not pseudoscience.
Answer:
179Kj/mol
Explanation:
The equation for the reaction is:
CaO + 3C ⇒ CaC₂ + CO
₂
The formula for calculating the heat absorbed is:
∆Hf (Products) - ∆Hf (Reactants)
Using the heat of formation (∆Hf) for each component in the reaction
∆Hf Cao = -635kj/mol
∆Hf C = 0kj/mol
∆Hf CaC2 = -63kj/mol
∆Hf CO2 = -393.5
The heat absorbed = ( -63 + -393.5) – (-635)
= - 456 + 635
= 179kj/mol
Answer:
2.86 kJ
Explanation:
When a substance is heated and there's no phase change happening, the amount of heat (Q) necessary for the heating can be calculated by:
Q = m*c*ΔT
Where m is the mass, c is the specific heat capacity of the substance, and ΔT is the variation of temperature. So, in this case, m = 53.8 g, c = 1.05 J/g°C, and ΔT = 50.6 K. The temperature variation is the same in °C and K, so:
Q = 53.8*1.05*50.6
Q = 2858.394 J (÷1000)
Q = 2.86 kJ
153.888 grams are in 4.8 moles of sulfur
