Nuclear fusion in the sun involves hydrogen (H) atoms combining to form helium (He). A student claims that since the atmosphere contains hydrogen, any fusion reaction on Earth would result in an uncontrolled chain reaction. What is wrong in the student’s reasoning is that the uncontrolled chain reactions can only happen during nuclear fission.
Uncontrolled chain reactions can only happen during nuclear fission is what is wrong with the student's reasoning.
This is the process in which the nuclei of an atomsplit into two or more nuclei with large amount of heat being involved.
Nuclear fusion in the sun involves hydrogen atoms combining to form helium and the student claims that since the atmosphere contains hydrogen, any fusion reaction on Earth would result in an uncontrolled chain reaction which is wrong as it occurs only during fission.
Read more about Nuclear fission here brainly.com/question/3992688
#SPJ5
Express your answer as a chemical formula.
Butane is from the family of alkanes with –ane as its family name. The but- prefix stands for having four carbon atoms. The C4H10 is the general formula of butane and can also represent other forms or structures of butane. However if the question asks for the molecular formula of butane, think of how many electrons it can share to the hydrogen atom. The carbon atom can share 4 and hydrogen 1. So if the three hydrogen atoms are attached to the first carbon, the other shared electron is attached to the second carbon. The second carbon atom can accommodate two hydrogen and 1 carbon. The third carbon can accommodate 2 hydrogen atoms and 1 carbon and the fourth carbon can accommodate 3 hydrogen atoms. The molecular formula is CH3-CH2-CH2-CH3.
chemical reactions?
Answer:
1. D. cal......
2.A. iron
3. D
4.2.44j/g°C A
5,Lf=334J/g B
Explanation:
1: Which of the following is the abbreviation for a unit of energy? A. K / B. °C/ C. W / D. cal...............
calorie is the unit of energy
#2: A 200 g block of a substance requires 1.84 kJ of heat to raise its temperature from 25°C to 45°C. Use the table attached to identify the substance. A. iron/ B. aluminum/ C. gold/ D. copper.....................
Q=mcdt
1840=0.2*C*(45-25)
C=460J/KgK
if the specific heat capacity is the above then he substance is iron
#3: In a calorimeter, the temperature of 100 g of water decreased by 10°C when 10 g of ice melted. How much heat was absorbed by the ice? A. 418 kJ / B. 100 kJ / C. 10 J / D. 4.18 kJ .................
Q=mcdT
Q=0.1*10*4180
Q=4180j. answer D
.#4: The amount of heat needed to raise the temperature of 50 g of a substance by 15°C is 1.83 kJ. What is the specific heat of the substance? A. 2.44 J/g-°C / B. 2.22 J/g-°C / C. 2.13 J/g-°C / D. 2.05 J/g-°C ................
Q=mcdT
1830=50/1000*C*15
C=2440j/kg/k
change it to j/g°C
2.44j/g°C A
#5: In a calorimeter, 3.34 kJ of heat was absorbed when 10 g of ice melted. What is the enthalpy of fusion of the ice? A. 6.68 J/g / B. 334 J/g / C. 6.68 kJ/g/ D. 334 kJ/g
Q=mLf
Lf=enthalpy of fusion
3340/10=Lf
Lf=334J/g B
Enthalpy of fusion quantity of heat to convert 1 unit mass of a solid to liquid without any noticeable change in temperature.