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bearhunter [10]
3 years ago
5

Is a burning log an exothermic or endothermic event if the log is the system?

Chemistry
2 answers:
Katyanochek1 [597]3 years ago
8 0

Answer:

Exothermic

Explanation:

Burning wood provides heat through the exothermic chemical reaction of oxygen (O) with cellulose (C6H10O5), the major chemical component of wood, to produce carbon dioxide (CO2), steam (H2O) and heat.

yaroslaw [1]3 years ago
3 0

Answer:

Im the one who dont know the answer

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A block of wood has a density of 0.6g/cm cubed and a volume of 1.2g/cm cubed. What is the mass of the block of wood?
Rus_ich [418]
<span>0.6 = mass/1.2 </span>
<span>mass = 0.6 x 1.2 </span>
<span>= 0.72 g </span>

3 0
3 years ago
Soap is made of molecules with atoms that share electrons equally at one end and atoms that have a slight charge at the other en
Arte-miy333 [17]
Soap has both a polar end and a nonpolar end. Thus, it maybe soluble to most of the substances. It exhibits both properties of non-polar and polar molecules. The hydrocarbon chain is the non-polar side while the salt end is the polar end.
4 0
3 years ago
When 125.0 g of ethylene (C2H4) burns in 60.0 grams of oxygen to give carbon dioxide and water, how many grams of CO2 are formed
gizmo_the_mogwai [7]

Answer:

             66 g of CO₂

Solution:

The Balance Chemical Reaction is as follow,

                             C₂H₂  +  5/2 O₂    →    2 CO₂  +  H₂O

Or,

                             2 C₂H₂  +  5 O₂    →    4 CO₂  +  2 H₂O    -------  (1)

Step 1: Find out the limiting reagent as;

According to Equation 1,

            56.1 g (2 mole) C₂H₂ reacts with  =  160 g (5 moles) of O₂

So,

                  125 g of C₂H₂ will react with  =  X g of O₂

Solving for X,

                      X =  (125 g × 160 g) ÷ 56.1 g

                      X =  356.5 g of O₂

It means for total combustion of Ethylene we require 356.5 g of O₂, but we are only provided with 60.0 g of O₂. Therefore, O₂ is the limiting reagent and will control the yield.

Step 2: Calculate Amount of CO₂ produced as;

According to Equation 1,

              160 g (5 mole) O₂ produces  =  176 g (4 moles) of CO₂

So,

                  60.0 g of O₂ will produce  =  X g of CO₂

Solving for X,

                      X =  (60.0 g × 176 g) ÷ 160 g

                      X =  66 g of CO₂

8 0
3 years ago
Aplica el método científico. Toma en cuenta que el desplazamiento de un vehiculo , el paso de la electricidad por los cables la
Daniel [21]

Answer:

Revisa con detalle la explicación.

Explanation:

¡Hola!

En este caso, debemos tener en cuenta que los pasos básicos del método científico son:

- Observación.

- Experimentación.

- Registro de datos.

- Análisis.

- Conclusiones

Para el primer caso (desplazamiento de un vehiculo), consideramos la primera ley de Newton o también ley de inercia en la cual explica que un cuerpo se mantendrá en reposo o en constante movimiento hasta el momento en que se aplica una fuerza externa.

Con los pasos del método científico encontramos que para el desplazamiento de un vehiculo se encuentra inicialmente en reposo pero luego se aplica una fuerza que hace que se mueva. Luego para la experimentación, se realiza un experimento con un carro de juguete (por ejemplo) inicialmente en reposo y al que se le aplica una fuerza para moverlo, con lo que se realiza el análisis y finalmente se obtiene la conclusión a la que llegó Newton.

Paso de electricidad: cuando se observa que hay algún dispositivo encendido, es posible usar un voltímetro para comprobar dicho paso por medio de mediciones.

Combustion del papel: cuando se enciende un trozo de papel con fuego y se observa que convierte en ceniza, es posible realizar el experimento con el fin de llegar a la conclusión de que al reaccionar con oxígeno, cambia la escructura de la celulosa a carbon, dióxido de carbono, agua y otros residuos.

Asimismo, al llevar a cabo experimentos de coagulación de la sangre en una herida y como los nutrientes obtenidos de los alimentos se convierten en energía para nosotros, podemos llegar a las conclusiones de que la sangre se coagula debido la existencia de plaquetas y que los alimentos se convierten en energía a partir de las enzimas que tenemos dentro de las células que los degradan en glucosa y lípidos reutilizables.

¡Saludos!

8 0
3 years ago
Which option is an example of something that can promote sustainable development?
storchak [24]

Having a large yard is an example of something that can promote sustainable development.

<h3>What is sustainable development ?</h3>

Sustainable development is an organizing principle for meeting human development goals while also sustaining the ability of natural systems to provide the natural resources and ecosystem services on which the economy and society depend.

A yard is an open place with fencing around it, with grasses and small shrubs. Having a large yard will not only meet the requirement of the human beings but also be in favor of environment as there will be no construction over that area.

To know more about sustainable development here

brainly.com/question/341749

#SPJ2

7 0
1 year ago
Read 2 more answers
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