One of the most effective ways to reduce greenhouse gases is using a car powered by fuel cells.
What are greenhouse gases?The term greenhouse gases refers to those gases that lead to a rise in the temperature of the earth due to the re-radiation of infrared rays towards the surface of the earth.
It is very important to take vital steps in order to prevent the emission of these gases. One of the most effective ways to reduce greenhouse gases is using a car powered by fuel cells.
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Answer:
Using a car powered by fuel cells
Explanation:
B On Edge
16.4 A cylinder of water contains oxygen in solution. The cross- sectional area of the cylinder is 2 cm2 and the length of the cylin- der is 5 cm. At one end of the cylinder the concentration of oxygern is maintained at 0.2 mol m-3, this concentration falls linearly to 0.05 mol m-3 at the other end of the cylinder. The diffusion con- stant of oxygen in water is 8 × 10-10 m2 s-1. How many moles of oxygen pass down this cylinder every second? What mass of oxy- gen passes down the cylinder each second?
Answer:
A) oxygen moles/sec = 48 * 10 ^-14 mol/sec
B) mass of oxygen = 1536*10^-14 grams
Explanation:
cross sectional area of cylinder = 2cm^2 = 2 * 10^-4 m^2
length of cylinder = 5 cm = 0.05 m
concentration at one end = 0.2 mol m^-3
concentration falls linearly at other end = 0.05 mol m^-3
Diffusion constant of oxygen = 8 * 10^-10 m^2 s^-1
A ) Number of moles of oxygen passing every second
N = A * D * [tex]\frac{dc}{dt}[/tex] ------- ( 1 )
A = area , D = diffusion constant, [tex]\frac{dc}{dt}[/tex] = rate of change of diffusion
dc /dt = ( 0.2 - 0.05 ) / 0.05 = 3 mol m^-4
back to the equation
N = ( 2 * 10^-4 ) * ( 8 * 10^-10 ) * ( 3 ) = 48 * 10 ^-14 mol/sec
B) Mass of oxygen passing down the cylinder each second
This can be obtained by converting : 48 * 10^-14 moles to grams
1 mole of oxygen = 32 grams of oxygen
therefore : 48 * 10^-14 moles of oxygen = ( 32 * (48*10^-14) = 1536*10^-14 grams
Which of the statements below about buoyancy is true?
A.if the buoyant force is greater than the force of gravity,the object will sink
B.buoyancy is a force that acts on objects that are placed in a fluid
C.all objects that experience the force of buoyancy float
D.buoyancy pushes objects down in the same direction as gravity
(answer asap plz I will give brainliest to who helps me )
Answer:
it's A. if the force of gravity is greater than the buoyant force, the object will sink.
Explanation:
just took the quiz on a p e x
Which is a feature of a single replacement reaction?
Substance XYZ breaks down into X and YZ.
Substance G reacts with compound XY to form GY and X.
Substance X burns rapidly in the presence of oxygen.
Substance QR and GT exchange ions with each other.
Answer:
Its B
Explanation:
Because im just built different
The statement featuring the single replacement reaction has been statement B.
The single replacement reaction has been defined as the reaction of the highly reactive element with the compounds, that results in the formation of the new compound with the replacement of the less reactive element.
The single replacement reaction can be given as:
G + XY [tex]\rightarrow[/tex] GY + X
In the reaction, G being more reactive than X has been able to displace X and forms bond with Y. Thus, statement featuring the single replacement reaction has been B.
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What is the density (g / mL) of a substance that has a mass of 8.11 g and, when placed into a graduated cylinder, causes the water level to rise from 25.26 mL to 44.72 mL?
Answer:
The answer is 0.42 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 8.11 g
volume = final volume of water - initial volume of water
volume = 44.72 - 25.26 = 19.46 mL
We have
[tex]density = \frac{8.11}{19.46} \\ = 0.416752312...[/tex]
We have the final answer as
0.42 g/mLHope this helps you
How many lead (Pb) atoms are in a 5.32 g sample of pure lead?
Answer:
1.55×10²² molecules.
Explanation:
We'll begin by calculating the number of mole in 5.32 g of pure lead (Pb). This can be obtained as follow:
Mass of Pb = 5.32 g
Molar mass of Pb = 207 g/mol
Mole of Pb =?
Mole = mass /molar mass
Mole of Pb = 5.32/207
Mole of Pb = 0.0257 mole
Finally, we shall determine the number of molecules in 0.0257 mole of Pb. This can be obtained as follow:
From Avogadro's hypothesis,
I mole of Pb contains 6.02×10²³ molecules.
Therefore, 0.0257 mole will contain = 0.0257 × 6.02×10²³ = 1.55×10²² molecules.
Therefore, 5.32 g of pure lead (Pb) contains 1.55×10²² molecules.
I need help on this, the question in here:
Answer:
The wheel size does not affect the speed of the skateboard.
Explanation:
This is true because Nikki's average time goes up while Lisa's goes down, so it depends on how hard they are pushing the skateboard with their foot.
A block of metal has a mass of 85g and a volume of 6.35mL. What is the density?
Answer:
13.39
Explanation:
Density is g/mL divide the grams by the mL
Atoms contain positively charged protons and negatively charged electrons. Why does an ordinary atom have no charge?
Atoms contain positively charged protons and negatively charged electrons. The atoms contain the same number of protons and electrons so the positively charged protons balance out the negatively charged electrons. Therefore, an atom is electrically neutral because it has no charge.
Which atom has the largest atomic radius
5) Which of these are intensive properties?
a substance has a volume of 5.4 mL
a substance has a mass of 1.25 g
a substance has a density of 4.13 g/cm3
a substance has a melting point of 40°C
a substance is very malleable (it can be hammered into a shape)
6) Which of these are extensive properties?
a substance has a melting point of 40°C
a substance is very malleable (it can be hammered into a shape)
a substance has a volume of 5.4 mL
a substance has a mass of 1.25 g
a substance has a density of 4.13 g/cm3
Answer:
For number 5 it is the 2nd one some stants has a mass of 1.25 g And the 2nd 1 number 6It is the 1st 1A subject has a melting point of 40
Use the periodic table to determine the electron configuration for aluminum (Al) and arsenic (As) in noble-gas notation.
Al:
[Ar]3s23p1
[He]2s22p63s23p1
[Ne]3s23p1
[Ne]3s23p2
Answer:
C
Explanation:
[Ne]3s23p1
Answer:
C
Explanation:
What do organs combine to form? organ systems cells tissues organisms
Answer:
the answer is {organisms}
Answer:
organisms
Explanation: I took the test
Which of the following is a common sign that a chemical change has occurred?
✓7
Is it rational or irrational
Answer:
Irrational
Explanation:
:)
Answer:
It is irrational
Explanation:
Since 7 is a prime number, it has no square factors and its square root cannot be simplified.
Using the formula Q = m x ^T x Cp, solve for energy, and round your answer to the correct number of sig figs and show all work:
1) How much heat is absorbed by 1210. g water (Cp = 4.184 J/g*C) when it is heated from 20*C to 45*C
Answer:
Q = 126.5 kJ
Explanation:
Given that,
Mass, m = 1210 g
Specific heat of water, c = 4.184 J/g°C
Initial temperature, [tex]T_i=20^{\circ} C[/tex]
Final temperature, [tex]T_f=45^{\circ} C[/tex]
We need to find the heat absorbed by water. The formula that is used to find the heat absorbed is given by :
[tex]Q=mc\Delta T[/tex]
Putting all the values in it we get :
[tex]Q=1210\ g\times 4.184\ J/g^{\circ} C\times (45-20)^{\circ} C\\Q=126566\ J\\\\\text{or}\\\\Q=126.5\ kJ[/tex]
So, the amount of heat absorbed is 126.5 kJ.
If 298 mL of 0.575 M CuCl2 is diluted into 750 mL, what is the concentration of new solution?
Answer:
The answer is 0.228 MExplanation:
To find the concentration of new solution we use the formula
[tex]C_1V_1 = C_2V_2[/tex]
where
C1 is the concentration of the stock solution
V1 is the volume is the volume of the stock solution
C_2 is the concentration of the diluted solution
V2 is the volume of the diluted solution
Since we are finding the the concentration of new solution
[tex]C_2 = \frac{C_1V_1}{V_2} \\[/tex]
From the question
C1 = 0.575 M
V1 = 298 mL
V2 = 750 mL
We have
[tex]C_2 = \frac{0.575 \times 298}{750} \\ = 0.228466666...[/tex]
We have the final answer as
0.228 MHope this helps you
What allows a liquid to take the form of the container it is in?
A.
strong intermolecular forces
B.
low temperature
C.
weak intermolecular forces
D.
low kinetic energy
Answer:
It's probably C
The forces between liquid particles are weaker than the forces between solid particles. This means that liquid particles are further apart and can move about more easily. Since the particles can move, the liquid can flow and take the shape of its container
Sorry if the answer is wrong!!!!!!
What is the enthalpy of reaction for the decomposition of calcium carbonate?
CaCO3(s) Right arrow. CaO(s) + CO2(g)
Answer:
Explanation:
You will need to look up the Standard Heats of Formation* for each substance and apply Hess's Law Equation.
ΔH⁰(rxn) = ∑ΔH⁰(Products) - ∑ΔH⁰(Reactants)
*Std Heats of Formation can be found in the appendix of most college chem texts.
For this problem:
Given CaCO₃(s) => CaO(s) + CO₂(g)
∑ΔH⁰: -635.1 Kj/mole -393.5Kj/mole -1206.9
ΔH⁰(rxn) = [(-393.5 Kj/mole) + (-393.5Kj/mole)] - (-1206.9Kj/mole)
= (-635.1 -393.5 + 1206.9) Kj/mole
= +178.3 Kj/mole
Answer:
656.3 kJ
This reaction is endothermic
Explanation:
edge 2020
What is the term for an object's strength of motion?
O Momentum
O Acceleration
O
Force
O
Velocity
I'm pretty sure its momentum
Ammonium sulfate, an important chemical fertilizer, can be prepared by the reaction of ammonia with sulfuric acid according to the following balanced equation:
2 NH3(g) + H2SO4(aq) → (NH4)2SO4(aq)
If a reaction vessel has 3.29 L of NH3 at 31.5°C and 22.7 atm, how many grams of H2SO4 are needed to completely react with it?
_________________ g H2SO4. Do NOT enter unit. Report your final answer with 3 SFs.
Answer:
Ammonia reacts with sulphuric acid to give the fertilizer ammonium sulphate.
Explanation:
How many electrons should Nitrogen (N) have around its Lewis dot model?
Answer:
5
Explanation:
5 electrons Nitrogen (N) have around its Lewis dot model. Therefore, the correct option is option D among all the given options.
What is nitrogen?Nitrogen (N), a nonmetallic element belonging to Periodic Table Group 15 [Va]. It is a colorless, flavorless, and odorless gas that makes up the majority of the atmosphere on Earth and is a component of all living things.
In terms of cosmic abundance, nitrogen is the sixth most abundant element. The main supply of nitrogen for trade and industry is the atmosphere of Earth, which contains 75.51 percent nitrogen by weight. Aside from nitrogen oxides and nitric acid, the atmosphere also includes variable tiny quantities of ammonia and ammonium salts. 5 electrons Nitrogen (N) have around its Lewis dot model.
Therefore, the correct option is option D.
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Where can you find most of Earth's liquid freshwater?
Answer:
Where can you find most of Earth's liquid freshwater?
Explanation:
Over 68 percent of the fresh water on Earth is found in icecaps and glaciers, and just over 30 percent is found in ground water. Only about 0.3 percent of our fresh water is found in the surface water of lakes, rivers, and swamps.
Hope that helped, i also have snap if you need me.
Over 68 per cent of the fresh water on Earth is found in icecaps and glaciers, and just over 30 per cent is found in groundwater. Only about 0.3 per cent of our freshwater is found in the surface water of lakes, and rivers.
What is the per cent of the water on this earth?The Earth is a watery place. About 71 per cent of the Earth's surface is water-covered, and the oceans hold about 96.5 per cent of all Earth's water.
The majority of Earth’s fresh water is stored in underground aquifers.
Aquifers are layers of sedimentary formations such as sandstone and fractured hard rocks where water after infiltration from soil reaches and fill the interstitial spaces.
Aquifers are huge in size in basins and contain a huge amount of underground water of fresh quality.
So, over 68 per cent of the freshwater is present on Earth.
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A testable explanation of or answer to a scientific question that is based on prior knowledge or research is a(n)
Answer:
the answer is HYPOTHESIS your welcome
Explanation:
To convert measurements in the metric system you can move the decimal point left or right why does this work?
Explanation:
Because when you move the decimal point once, it it equal to 10 and to convert in the metric system, you must multiply or divide by 10. For example, when converting 4 centimeters to millimeters, you can multiply by 10 to get 40 millimeters or you can move the decimal point to the right and add another 0 to get 40.
Answer:
when you move tne decmal point it alwase ads up to ten
Explanation:
PLZ HELP HURRY PLZZZ
Answer:
alkali metals
Explanation:
s block elements are also called alkali metals
In lab, you measure out 24.25g of C2H4. How many atoms of H is this?
Answer:
anong sagot jan? d ko kasi alam ehhh penge sagot
Compounds have the same properties as the elements they are made up of. Is it true or false
Answer:
compounds have the same properties the elementary are false.
We have unlimited wants but our resources such as time and money are limited. This concept is known as A. Scarcity B, Consumption C. Trade D. Currency
Answer:
Since human wants are unlimited, and resources used to satisfy those wants are limited - there is scarcity. Even in the US, one of the richest countries in the world, there is scarcity -- if we use our new definition of SCARCITY.
hope it helps
WILL GIVE BRAINLEIST
For this assignment, you will develop a model that shows a roller coaster cart in four different positions on
a track. You will then use this model to discuss the changes in potential, kinetic, and thermal energy of
the cart as it moves along the track.
Answer:
This should help :)
Explanation:
The cart has a lot of potential energy, little kinetic energy, and little thermal energy when it is in position A. The kinetic energy and potential energy both rise as the cart moves towards position B, while the thermal energy rises as thermal energy from the track is transmitted to the cart through friction
What is Kinetic energy ?
Kinetic energy, which may be seen in the movement of an object, particle, or group of particles, is the energy of motion.
The cart has a lot of kinetic energy, little potential energy, and little thermal energy after it reaches position C. The cart has some thermal energy and a high potential energy at point D.
It also has a low kinetic energy. Gravity, momentum, and friction are all connected with potential energy, kinetic energy, and thermal energy, respectively.
Position A is when the potential energy is at its highest, and its kinetic energy is at its peak in position C and at its lowest in position A, whereas thermal energy is at its peak in position B and at its lowest in position A.
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what is the meaning between fission and fusion
Answer:
Both are nuclear reactions that produce energy,but the applications are not the sameExplanation:
Fission -is the spitting of a heavy,unstable nucleus into two lighter nuclei Fussion -is the process where two light nuclei combine together releasing vast amounts of energy.