4 years ago

A jet engine might use _____.

Chemistry

2 answers:

Y_Kistochka [10]4 years ago

6 0

It would use rapid combustion

andriy [413]4 years ago

5 0

Rapid combustion I think

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Hydrogen bonds are approximately _____% of the bond strength of covalent c-c or c-h bonds.

Lelu [443]

Hydrogen bonds are approximately 5% of the bond strength of covalent C-C or C-H bonds.
Hydrogen bonds strength in water is approximately 20 kJ/mol, strenght of carbon-carbon bond is approximately 350 kJ/mol and strengh of carbon-hydrogen bond is approximately 340 kJ/mol.
20 kJ/350 kJ = 0,057 = 5,7 %.

4 0

3 years ago

A student carried out an acid-base titration by adding NaOH solution from a buret to an Erlenmeyer flask containing HCl solution

Arada [10]

Answer:

Shift in equilibrium position

Explanation:

The reddish-pink colour signalled the equivalence point. That is, pH=PKind. This was the point at which we have commonly the called the end point of the titration which has been carried out. As the solution was left to stand after this equivalence point was attained, the equilibrium position shifted again towards the acid side and the solution turned colourless once more. The equilibrium position indicated by the colour change depends on the H+ concentration of the solution.