Which contributes to acid rain? A. solar power

B. burning fossil fuels

C. nuclear power

D. hydroelectric power

Answers

Answer 1

Answer: The answer is D. hydroelectric power

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A 1.00-L bulb and a 1.50-L bulb, connected by a stopcock, are filled, respectively, with argon at 0.75 atm and helium at 1.20 atm at the same temperature. Calculate the total pressure and the partial pressures of each gas after the stopcock has been opened and the mole fraction of each gas. Assume ideal-gas behavior.

Answers

Answer:

Explanation:

If P₁(p) be the partial pressure of gas in first bulb then

P₁(p) (1 +1.5) = P₁V₁ = 1 X 0.75

P₁(p) = (1 / 2.5) x .75 = 0.3 atm

Similarly partial pressure of gas in second bulb

= ( 1.5 / 2.5) x 1.2 = .72 atm

Total pressure= .3 + .72 = 1.02 atms.

If n₁ and n₂ be their moles in the respective bulbs

P₁V₁ = n₁ R t

P₂ V₂ = n₂ R t

$(P_1V_1)/(P_2V_2) = (n_1)/(n_2)$

$(n_1)/(n_2+n_1 ) = (P_1V_1)/(P_1V_1+P_2V_2)$

mole fraction of argon = $(.75* 1)/(.75*1+1.2*1.5)$

= $(.75)/(2.55)$

= 15 / 51

Mole fraction of helium = 1 - 15 / 51 = 36 / 51

Answer:

The total pressure of the mixture is 1.02 atm.

Partial pressure of the argon : $p_(Ar)=0.30atm$

Partial pressure of the helium : $p_(He)=0.72atm$

Explanation:

Volume of argon in the bulb = $V_1$ = 1.00 L

Pressure of argon in the bulb = $P_1$ = 0.75 atm

Temperature of the both the gases = T

Moles of argon gases = $n_1$

$P_1V_1=n_1RT$ ..[1]

Volume of helium in the bulb = $V_2$ = 1.50 L

Pressure of helium in the bulb = $P_2$ = 1.20 atm

Moles of helium gases = $n_2$

$P_2V_2=n_2RT$ ..[2]

[1] ÷ [2]

$(P_1V_1)/(P_2V_2)=(n_1)/(n_2)$

$(n_1)/(n_2)=(0.75 atm* 1.00 L)/(1.20 atm* 1.50 L)$

$(n_1)/(n_2)=(5)/(12)$

$n_2=2.4* n_1$

After opening the stopcock, the gases are mixed.

The mole fraction of argon = $\chi_1=(n_1)/(n_1+n_2)$

$\chi_1=(n_1)/(n_1+2.4n_1)=0.2941$

The mole fraction of helium= $\chi_2=(n_2)/(n_1+n_2)$

$\chi_2=(2.4n_1)/(n_1+2.4n_1)=0.7059$

Volume of the mixture ,V= 1.00 L + 1.50 L =2.50 L

Total pressure in the mixture = P

Temperature is same = T

Total moles of gases in the mixtures = n

$PV=nRT$

$n=n_1+n_2$

$(PV)/(RT)=(P_1V_1)/(RT)+(P_1V_1)/(RT)$

$P* 2.50L=0.75 atm* 1.00 L+1.20 atm* 1.50 L$

$P* 2.50L=2.55 atm L$

$P=(2.55 atm L)/(2.50 L)=1.02 atm$

The total pressure of the mixture is 1.02 atm.

Partial pressure of the argon after mixing : $p_(Ar)$

$p_(Ar)=P* \chi_1=1.02* 0.2941=0.30 atm$

Partial pressure of the helium after mixing : $p_(He)$

$p_(He)=P* \chi_2=1.02* 0.7059=0.72 atm$

A 10,000-kg railroad car travels down the track at 30 m/s and hits a second stationary railroad car of 20,000 kg. The cars become coupled and continue traveling. Calculate the final velocity of the cars.

Answers

Answer:

10 m/s

Explanation:

The problem can be solved by using the law of conservation of momentum: the initial momentum has to be equal to the final momentum, so we can write the following

$p_i = p_f$

$m_1 u_1 + m_2 u_2 = (m_1 +m_2 )v$

where

$m_1 = 10,000 kg$ is the mass of the first car

$u_1=30 m/s$ is the initial velocity of the first car

$m_2 = 20,000 kg$ is the mass of the second car

$u_2 = 0$ is the initial velocity of the second car

$v$ is the final velocity of the two combined cars after the collision

Re-arranging the equation and substituting the numbers, we find

$v=(m_1 u_1 +m_2 u_2)/(m_1+m_2)=((10,000)(30)-0)/(10,000+20,000)=10 m/s$

Which astronomer spent 20 years plotting the positions of the planets

Answers

Answer

Tycho Brahe

Explanation

Tycho Brahe who was born on 1546. He was an astronomer.Tycho Brahe spent 20 years in plotting the positions of the planets and he was among those astronomers who helped in giving the heliocentric model of the universe..

That was Tycho Brahe, and I thought it was actually more years than that.

You mix two clear solutions , instantly your see a bright yellow precipitate form. What type of reaction did your just observe

Answers

precipitation reaction is the reaction that you have just observed.

I think the answer to this question is "a chemical reaction".

Epsilon Eridani is a star that is 10.5 light years away from Earth. One light year is about 9.46 trillion kilometers The distance between the star and Earth in kilometers is trillion kilometers?

Answers

Given the relation that 1 light year = 9.46 trillion kilometers, and the distance from Epsilon Eridani to Earth which is 10.5 light years, we can solve for the distance between the star and Earth in light years by multiplying both values together. This is shown below

Dsitance (in trillion km) = 9.46 trillion km * (10.5) = 99.33 trillion kilometers

Answer:99.33

Explanation:

A pre-trip inspection will help you ____________.A. find problems that could cause a collision or breakdown
B. avoid a post-trip inspection
C. know how far you must travel
D. save money on fuel

Answers

Answer:

A. find problems that could cause a collision or breakdown

Explanation:

A pretrip inspection allows the driver to drive safely because he feels satisfied since he already had checked each and everything in the beginning. This increases the focus on driving. In addition to it there are less chances of happenings and technical faults in the vehicle. It also plays a vital role in the safety circumstances as well.

Answer
A.To find problems that could cause a collision or breakdown.

Explanation
A pre-trip inspection is the trip made by the organizers before the due date of the trip.
There are many reasons why pre-trip inspection is necessary. Some of them include:
1. Finding out how much information is available,
2. The cost to be incurred,
3. Assessing the route and the safety of the place,
4. The most important been to help in preparation of the budget and many others
From the choices given, the most appropriate answer is A. To find problems that could cause a collision or breakdown.

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Alejandra weighs 225 newtons. how much work does she do against gravity when she climbs to a ledge at the top of a 15 meter climbing wall

Which contributes to acid rain? A. solar power B. burning fossil fuels C. nuclear power D. hydroelectric power

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Which contributes to acid rain? A. solar power

B. burning fossil fuels

C. nuclear power

D. hydroelectric power