1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
lorasvet [3.4K]
2 years ago
8

In a particular chemical reaction, the energy of the reactants is 30 kJ and the energy of the products is 5 kJ. The maximum ener

gy of the system is 40 kJ.
Sketch a potential energy diagram for this reaction. Make sure to label the energy of the reactants, the energy of the products, the activation energy, and the enthalpy change for the reaction.
What is the activation energy for this reaction?
What is the enthalpy change for this reaction?
Is this reaction endothermic or exothermic? Explain your answer in two ways: first, using the energy values, and second, by referring to the shape of the graph.
The coating on the head of a match is highly flammable. When it burns, it releases a great deal of energy. However, before the match can burn, it must gain a small amount of energy from a spark. That spark is typically produced by striking (rubbing) the match head against a rough surface. Sketch and describe a potential energy diagram that represents the striking and burning of the match. Remember to label the diagram with the energy changes that occur. Your answer must include the potential energy diagram and a written description. (Note: you do not have to use actual energy values.)
Physics
1 answer:
Drupady [299]2 years ago
5 0

An energy of 25kJ is given out hence the reaction is exothermic.

<h3>What is a reaction?</h3>

Chemical reaction is said to occur when reactants combine leading to the formation of products. In a plot of the energy against the reaction profile, the topmost point of the graph is called the activation energy.

We know that a reaction is exothermic when reactants posses more energy than the products. Hence the enthalpy change for this reaction is;

ΔH = 5kJ - 30kJ = -25kJ thus the reaction is an exothermic reaction.

Now, the activation energy for the lighting of the match stick is high that is why a spark is required before the reaction gets underway. Heat is evolved in the process hence the reaction is exothermic. The energy of the reactants is greater than the energy of the products.

Learn more about exothermic reaction:brainly.com/question/10373907

#SPJ1

You might be interested in
What piece of sports equipment is aerodynamic
Mashcka [7]
Aerobie.  Frisbee.  Discus.  Javelin.  I suppose an American football to some extent. 
<span>Pull!  Clay pigeons.  Arrows.  Wingsuit.  Kites.  Hang gliders.  Sails.  sailboat keels/dagger boards.  Water skis.  Ski jumping skis.  Boomerang.  </span>
<span>I'm excluding spheres and parachutes as bluff bodies even though aerodynamics often plays a big part in their motion.</span>
6 0
3 years ago
B
SVEN [57.7K]

Answer:

Frequency = 1,550Hz

Explanation:

To solve this we can use the equation: f=\frac{v}{\lambda}

(frequency = velocity/wavelength).

We are given the information that the wavelength is 22cm and the speed is 340m/s. The first step is to make sure everything is in the correct units (SI units), and to convert them if needed. The SI Units for velocity and wavelength are m/s and m respectively. This means we need to convert 22cm into meters, which we can do by dividing by 100, (as there are 100cm in a meter). 22/100 = 0.22m

Now we can substitute these values into the formula and calculate to solve:

f=\frac{340}{0.22} \\\\f=1545.454...

Simplify to 3 significant figures:

f = 1,550Hz

(Which I believe is just below a G6 if you were interested)

Hope this helped!

4 0
3 years ago
Which diagram is the best representation of gas molecules in a closed container? A. Diagram A B. Diagram B C. Diagram C D. Diagr
WITCHER [35]
Gas "floats" so if there are examples or pictures it would be the one with the most evenly spread out "dots". 
8 0
2 years ago
Current what can do work in an electric device
Serggg [28]
It could help transport important information
5 0
3 years ago
If you wanted to produce more power,what could you do to maximize power
PSYCHO15rus [73]

In physics, power is defined as energy per unit time.  You will also hear it described as work per unit time.  The standard unit of measure for power is the watt, where a watt is defined as joules (energy) per second (time).  This is expressed as a fraction as J/s.  If you wanted to increase the power in any operation, you can either increase the energy (more joules) or reduce the time (fewer seconds).

6 0
3 years ago
Read 2 more answers
Other questions:
  • Which if these events happens first in earths polar regions
    9·1 answer
  • Although there are different ways to approach a scientific investigation, all scientific investigations begin with some sort of
    7·2 answers
  • Are bases chemically the same as acids true or false
    15·1 answer
  • In the following diagram, the voltage is 1.5 volts and the resistance is 7.5 ohms. Use Ohm's law to determine the current in the
    7·2 answers
  • Which of these is described as force per unit charge on a positive test charge?
    9·1 answer
  • (HELP QUICK!!) Air pressure is a result of _____
    6·2 answers
  • Why can you hear a man's voice around the corner of a building even if you can't see him?
    12·1 answer
  • A sound wave traveling through dry air has a frequency of 16 Hz, a wavelength of 22 m, and a speed of 350 m/s. When the sound wa
    15·2 answers
  • how much heat is produced in one hour by an electric iron which draws 2.5ampere when connected to a 100V supply​
    12·1 answer
  • A wire that is 1.0 m long with a mass of 90 g is under a tension of 710 N. When a transverse wave travels on the wire, its wavel
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!