31. A(n) - _lists common engine malfunctions, possible<br> causes, and suggested remedies.<br> 31

NO reacts with Br2 in the gas phase according to the following chemical equation: 2NO(g) +Br2(g)2NOBr(g) It is observed that, wh

klemol [59]

Answer:

a) $rate=r=k[NO]^{2} [Br_{2}]^{1}$

b) $k=\frac{1}{s*M^{2}}$

Explanation:

First of all you need to indicate the reaction order of each reactant ( $NO$ and $Br_{2}$ ):

1. $Br_{2}$

Note that if $Br_{2}$ concentration ( $[Br_{2} ]$ ) is reduced to 1/3 of its initial value, the rate of the reaction is also reduced to 1/3 of its initial value, it means:

$[Br_{2} ]=1/3$ then $r=1/3$

As the change in the rate of the reaction is equal to the change of the initial concentration of $Br_{2}$ , you could concluded that the reaction is first order with respect to $Br_{2}$

2. $NO$

Now, note that if $NO$ concentration ( $[NO]$ ) is multiplied by 3.69, the rate of the reaction increases by a factor of 13.6. In this case, to know the ratio could be advisable divide the rate of the reaction (13.6) over the factor whereby was multiplied the concentration (3.69), as follows:

$\frac{13.6}{3.69}=3.69$

As the result is the same factor 3.69 you could concluded that the change of the rate of reaction is proportional to the square of the concentration of A:

$r=[NO]^{2} =3.68^{2} =13.6$

It means that the reaction is second order with respect to $NO$

3. Rate Expression

Remember that the rate expression of the reactions depend on the concentration of each reactant and its order. In this case we have 2 reactants: $NO$ and $Br_{2}$ , then we have a rate law depending of 2 concentrations, as follows:

Note that the expression is the result of the concentration of each reactant raised to its reaction order (previously determined)

<em>Note: I hope that you do not mix up the use of the rates of reaction of each reactant, that is experimentally determined, with the stoichiometric coefficient, are different.</em>

4. Rate constant units (k)

Assuming concentration is expressed as $\frac{mol}{L}=M$ and time is in second, to find the units of k we need to solve an equation with units and with supporting of the rate equation previously obtained, as follows:

$r=k[NO]^{2} [Br_{2}]^{1}$

Where:

$[r]=[\frac{M}{s}]$

$[[NO]]=[M]$

$[ [Br_{2}]]=[M]$

Then:

$\frac{M}{s}=kM^{2} M^{1}$

$\frac{M}{s}=kM^{3}$

$\frac{M}{s*M^{3}}=k$

The units of the rate constant k are:

$k=\frac{1}{s*M^{2}}$

8 0

4 years ago

Write down everything that you know about climate or climate change.

marta [7]

The Earth's average temperature is about 15C but has been much higher and lower in the past.
There are natural fluctuations in the climate but scientists say temperatures are now rising faster than at many other times.
This is linked to the greenhouse effect, which describes how the Earth's atmosphere traps some of the Sun's energy.
Solar energy radiating back to space from the Earth's surface is absorbed by greenhouse gases and re-emitted in all directions.
This heats both the lower atmosphere and the surface of the planet. Without this effect, the Earth would be about 30C colder and hostile to life.
The greenhouse gas with the greatest impact on warming is water vapour. But it remains in the atmosphere for only a few days.
Carbon dioxide (CO2), however, persists for much longer. It would take hundreds of years for a return to pre-industrial levels and only so much can be soaked up by natural reservoirs such as the oceans.
Most man-made emissions of CO2 come from burning fossil fuels. When carbon-absorbing forests are cut down and left to rot, or burned, that stored carbon is released, contributing to global warming. The world is about one degree Celsius warmer than before widespread industrialisation, according to the World Meteorological Organization (WMO).
It says the past five years, 2015–2019, were the warmest on record.
Across the globe, the average sea level increased by 3.6mm per year between 2005 and 2015.
Most of this change was because water increases in volume as it heats up. However, melting ice is now thought to be the main reason for rising sea levels. Most glaciers in temperate regions of the world are retreating.
And satellite records show a dramatic decline in Arctic sea-ice since 1979. The Greenland Ice Sheet has experienced record melting in recent years.
Warmth shatters section of Greenland ice shelf
Satellite data also shows the West Antarctic Ice Sheet is losing mass. A recent study indicated East Antarctica may also have started to lose mass.
The effects of a changing climate can also be seen in vegetation and land animals. These include earlier flowering and fruiting times for plants and changes in the territories of animals.
The change in the global surface temperature between 1850 and the end of the 21st Century is likely to exceed 1.5C, most simulations suggest.
The WMO says that if the current warming trend continues, temperatures could rise 3-5C by the end of this century.
Temperature rises of 2C had long been regarded as the gateway to dangerous warming. More recently, scientists and policymakers have argued that limiting temperature rises to 1.5C is safer. There is uncertainty about how great the impact of a changing climate will be.
It could cause fresh water shortages, dramatically alter our ability to produce food, and increase the number of deaths from floods, storms and heatwaves. This is because climate change is expected to increase the frequency of extreme weather events - though linking any single event to global warming is complicated. As the world warms, more water evaporates, leading to more moisture in the air. This means many areas will experience more intense rainfall - and in some places snowfall. But the risk of drought in inland areas during hot summers will increase. More flooding is expected from storms and rising sea levels. But there are likely to be very strong regional variations in these patterns. Poorer countries, which are least equipped to deal with rapid change, could suffer the most.
Plant and animal extinctions are predicted as habitats change faster than species can adapt. And the World Health Organization (WHO) has warned that the health of millions could be threatened by increases in malaria, water-borne disease and malnutrition. As more CO2 is released into the atmosphere, uptake of the gas by the oceans increases, causing the water to become more acidic. This could pose major problems for coral reefs.
Global warming will cause further changes that are likely to create further heating. This includes the release of large quantities of methane as permafrost - frozen soil found mainly at high latitudes - melts.
Responding to climate change will be one of the biggest challenges we face this century.

7 0

3 years ago

Increasing rake angle will decrease the tendency for Built-Up-Edge to form. a) True b) False

anygoal [31]

Answer:

a)True

Explanation:

While machining of ductile material and high feed and low cutting speed welding action take place between tool material and chip material this welding action is called built up edge. Built up edge action takes place due to high temperature.

To decrease the built up edge action

1. Increase the rake angle.

2. Increase the cutting speed

3. Decrease the feed rate

4. Use cutting fluid

7 0

3 years ago

A three-phase voltage source with a terminal voltage of 22kV is connected to a three-phase transformer rated 5MVA 22kV/220V. The

amid [387]

Answer:

A) See Attachment B) See Attachment C) 186.153

Explanation:

C) Per phase Voltage= 220/∛3

= 6.037

S=V²/Z

= (6.037)²/(0.01+i0.05)

= 62051.282-i310256.41

Active power losses per phase= 62.051kW

total Active power losses= 62.051×3

=186.153kW

6 0

4 years ago

(a) Define a slip system. (b) Cite one slip system for the simple cubic crystal structure. (c) One slip system for the BCC cryst

Lemur [1.5K]

Answer:

I'm gonna say D.

4 0

3 years ago

31. A(n) - _lists common engine malfunctions, possible causes, and suggested remedies. 31