Answer:
The specific heat of aluminium is 0.8792 J/g °C or 0.21 Cal/g °C
Explanation:
Step 1 : Write formule of specific heat
Q=mcΔT
with Q = heat transfer (J)
with m = mass of the substance
with c = specific heat ⇒ depends on material and phase ( J/g °C)
with ΔT = Change in temperature
For this case :
Q = 1680 Calories = 7033.824 J ( 1 calorie = 4.1868 J)
m = 100.0g
c= has to be determined
ΔT = 100 - 20 = 80°C
<u>Step 2: Calculating specific heat</u>
⇒ via the formule Q=mcΔT
7033.824 J = 100g * c * 80
7033.824 = 8000 *c
c = 7033.824 /8000
c = 0,879228 J/g °C
or 0.21 Cal / g°C
The specific heat of aluminium is 0.8792 J/g °C or 0.21 Cal/g °C
<span>B cells produce different types of antibodies in each patient.</span>
Answer:
See explanation
Explanation:
In this case, we have to keep in mind the valence electrons for each atom:
<u>N => 5 electrons</u>
<u>O => 6 electrons</u>
If the formula is
, we will have in total:

Additionally, we have to remember that each atom must have 8 electrons. So, for <u>oxygens 5 and 3</u> we will have 3 lone pairs and 1 bond (in total 8 electrons. For oxygens, <u>6 and 4</u> we will have 2 lone pairs and 2 bonds (in total 8 electrons) and for <u>nitrogens 1 and 2</u> we will have 4 bonds (in total 8 electrons).
To find the <u>hybridization</u>, we have to count the atoms and the lone pairs around the nitrogen. We have 3 atoms and zero lone pairs. If we take into account the following rules:



With this in mind, the hybridization of nitrogen is
.
See figure 1
I hope it helps!
Answer:
Paraffin combustion produces more energy per gram than ethanol fuel but paraffin fuel has a larger carbon footprint
Explanation:
Paraffin is also known by the standard chemical name alkane with a chemical formula for a paraffin given as follows;
CₙH₂ₙ₊₂
While gasoline, also known as petrol, consists of light weight alkanes and alkenes
The heat of combustion of gasoline is about 47.3 kJ/g
The combustion of gasoline is incomplete as presented in the following equation

Example of complete combustion of octane, however, is given as follows;
2C₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O + Energy
The source of paraffin is from petroleum
Ethanol fuel can be produced by the fermentation of Sugar
The heat of combustion of ethanol = 1366.91 kJ/mol = 29.664 kJ/g.
2CH₃OH + 3O₂ → 2CO₂ + 4H₂O + Energy
Answer:
1) Big Bang Theory
2) we are in a phase of the big bang theory
Explanation:
So for number 1 the answer is the -big bang theory- and number 2 there is a theory that pretty much says that were in a constant cycle. what I mean is theoretically in a couple million years the entire universe will form together again into another dense ball and repeat the process. So basically the universe is still in the "expanding phase" and that's what backs up the theory of the big bang (the fact that were in one of the big bang theory's "phases")