During the experiment, scientists noted that several of the reaction beakers became hot to the touch. All of the following reactions could cause this result except endothermic and positive ∆H experiments.
<u>Explanation:</u>
If the beakers are becoming hot during experimentation, then that means the energy is being released from the reactants during this experiment. As the energy is being released that enthalpy change will also be negative as the enthalpy change is calculated as the difference of enthalpy of reactants from products.
So in these cases, heat is released making the beakers hot. So for the exceptional case, the experiment should be endothermic in nature and positive enthalpy change should be there in the experiment. Such that the heat will not be released leading to no heating of beakers.
Answer: The molar mass of this gas is 221 g/mol
Explanation:
The relation between density and molar mass is :
where P = pressure of gas = 1 atm (at STP)
M = molar mass of gas = 32 g/mol
d = density of gas = ?
R = gas constant = 
T= temperature of gas = 273 K ( at STP)
Thus the molar mass of this gas is 221 g/mol
the power of the blender allows the chemicals in the seperate foods to join togather
All of the above
Explanation:
Scientists can use spectra analysis of stars to determine:
- Surface temperature of the star
- Core temperature of stars
- Elements in the core of the star
- Elements on the surface of the star
Spectra analysis is the analysis or interpretation of the electromagnetic emissions from a matter.
They are very useful in indirect and descriptive studies of astronomical bodies since it might be very difficult of come in close contact with them.
Emissions spectrum typifies every matter in nature since all bodies emits specific radiations.
Using spectra analysis, scientists can determine the temperature that typifies an emission and the elements that might might be producing such signatures.
learn more:
Spectral analysis brainly.com/question/1857156
#learnwithBrainly
C. K since it is above Aluminium in the reactivity series
