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Reptile [31]
3 years ago
9

Which is an example of kinetic energy?

Chemistry
1 answer:
attashe74 [19]3 years ago
6 0

Answer:

<u>B. Wind</u>

Explanation:

Kinetic energy is moving

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A 100g of sample of a compound is combusted in excess oxygen and the products are 2.492g of CO2 and 0.6495 of H2O. Determine the
ruslelena [56]

The empirical formula : C₁₁O₁₄O₃

<h3>Further explanation</h3>

The assumption of the compound consists of C, H, and O

mass of C in CO₂ =

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mass of H in H₂O =

\tt \dfrac{2.1}{18}\times 0.6495=0.072~g

mass of O :

mass sample-(mass C + mass H)

\tt 1-(0.68+0.072)=0.248`g

mol of  C :

\tt \dfrac{0.68}{12}=0.056

mol of H :

\tt \dfrac{0.072}{1}=0.072

mol of O :

\tt \dfrac{0.248}{16}=0.0155

divide by 0.0155(the lowest ratio)

C : H : O ⇒

\tt \dfrac{0.056}{0.0155}\div \dfrac{0.072}{0.0155}\div \dfrac{0.0155}{0.0155}=3.6\div 4.6\div  1\\\\\dfrac{11}{3}\div \dfrac{14}{3}\div \dfrac{3}{3}=11:14:3

3 0
3 years ago
Volcanic molten lava pours out and re-hardens back into the rock again. Chemical change or physical change?
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Answer:

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What is the pH of a solution with [H+]2.3 x 10^-9 ? <br> a. -9.00B.-8.64C. 9.00D.8.64?
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pH can be defined as negative logarithm of hydronium ion concentration .

pH can be mathematical represented as :

pH =-log [H+]

[H+]=2.3*10^-9

pH= -log[2.3*10^-9]

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4 years ago
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What is chemistry...<br>jab-njko-rzv​
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Chemistry is the science of matter, its properties, structure, changes or reactions and the energy that accompanies these changes.

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B, mode since mode represents the data is the most frequent in the whole set, which in this case is 8cm
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