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Korolek [52]
3 years ago
13

16. Ramps, wedges, and chisels are examples of what type of machines?

Chemistry
1 answer:
BARSIC [14]3 years ago
4 0

ramps ,wedges ,and chisels are example of inclined plane machine,D none of the above

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Which type of chemical bond requires the least amount of energy to break?
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B) Double

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La manifestación de un huracán, el movimiento de los aerogeneradores cuando el viento alcanza una velocidad de 3 a 4 metros por
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Ambos son ejemplos de procesos de transformación de la energía.

El ejemplo del aerogenerador transforma la energía cinética traslacional del viento en energía cinética rotacional del aerogenerador y pérdidas debido a la fricción, la cual es en forma de calor.

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8 0
3 years ago
When 69.9 g heptane is burned it releases __ mol water.
professor190 [17]

Answer:

1) When 69.9 g heptane is burned it releases 5.6 mol water.  

2) C₇H₁₆ + 11O₂ → 7CO₂ + 8H₂O.

Explanation:

  • Firstly, we should balance the equation of heptane combustion.
  • The balanced equation is: <em>C₇H₁₆ + 11O₂ → 7CO₂ + 8H₂O.</em>

This means that every 1.0 mole of complete combustion of heptane will release 8 moles of H₂O.

  • We need to calculate the no. of moles in 69.9 g of heptane that is burned using the relation: <em>n = mass/molar mass.</em>

n of 69.9 g of heptane = mass/molar mass = (69.9 g)/(100.21 g/mol) = 0.697 mol ≅ 0.7 mol.

<em><u>Using cross multiplication:</u></em>

1.0 mol of heptane releases → 8 moles of water.

0.7 mol of heptane releases → ??? moles of water.

<em>∴ The no. of moles of water that will be released from burning (69.9 g) of water</em> = (0.7 mol)(8.0 mol)/(1.0 mol) = <em>5.6 mol.</em>

<em>∴ When 69.9 g heptane is burned it releases </em><em>5.6</em><em> mol water. </em>

<em />

5 0
3 years ago
How to figure out if a reaction is exothermic or endothermic?
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Exothermic is when energy is released
endothermic is when its being absorbed<span />
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