Answer:
Exhaust from cars, trucks, and buses releases nitrogen oxides and sulfur dioxide into the air. These can cause acid rain.
Hope this helps! :)
the basic fact that determines molecular shapes is that
Answer:
The shape of a molecule is mostly determined by repulsion among the pairs of electrons around a central atom.
A 12.0 L helium balloon is inflated in an air-conditioned store at 21.0C. Assuming that the pressure remains constant, how large is the balloon when it is taken outside on a hot day at 40.0C?
The ballon will be 22.86L large when it is taken outside on a hot day at 40⁰C
According to pressure law, the volume of a given mass of gas is directly proportional to the temperature. This is expressed as:
V = kT
k = V1/T1 = V2/T2
Given the following parameters
V1 = 12.0L
T1 = 21⁰C
T2 = 40.0⁰C
Required
Final volume
Substitute the given parameters into the formula
12/21 = V₂/40
21V₂ = 12 * 40
21V₂ = 480
V₂ = 480/21
V₂ = 22.86L
Hence the ballon will be 22.86L large when it is taken outside on a hot day at 40⁰C.
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I need help with this
How does Bone Marrow Donor Program work?
Name some diseases that can be cured by bone marrow transplant.
What is Donors’ Registry Program?
noooooooooooooooooooooo
Kinda confused on this. i need some help.
Word Equation for Magnesium reacting with Iron Chloride
Answer:
3Mg+2FeCl3------------3MgCl2+ 3Fe
Calculate the change in temperature of a 5.0 g sample of water that loses 1800J of heat energy.
Q = mcΔT
The specific heat of water is 4.18 J/g°C.
Taking into account the definition of calorimetry, the change in temperature of a 5.0 g sample of water that loses 1800J of heat energy is 86.12 C.
In first place, calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is the amount of heat that a body can receive or give up without affecting its molecular structure. If the molecular structure does not change, the state (solid, liquid, gaseous) does not change. Since the molecular structure does not change, a change in temperature is observed.
In other words, sensible heat is the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
In this case, you know:
Q= 1800 J c= 4.18 [tex]\frac{J}{gC}[/tex] m= 5 g ΔT= ?Replacing in the expression to calculate heat exchanges:
1800 J= 4.18[tex]\frac{J}{gC}[/tex]× 5 g× ΔT
Solving:
1800 J ÷ (4.18[tex]\frac{J}{gC}[/tex]× 5 g)= ΔT
ΔT= 86.12 C
In summary, the change in temperature of a 5.0 g sample of water that loses 1800J of heat energy is 86.12 C.
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brainly.com/question/11586486?referrer=searchResults brainly.com/question/24724338?referrer=searchResultsDon't really understand the question
Answer:
Did they mean those diagrams are the salt or what?
A chemist who frequently carries out a complex experiment is
likely to have high:
a. Precision, but low accuracy
b. Precision
c.Accuracy, but low precision
d.Accuracy
Answer:
c.
Explanation:
This is because the chemist will get the average of the experiment from multiple attempts but not precision because the experiment is complex rather than simple.
The chemist will most likely have high accuracy, but low precision. A
chemist who has been performing experiments frequently will be accurate
when taking the required measurements for the experiment due to the
frequency.
Precision however won't be affected because precision deals with how
close his results from the experiment are. The complexity of the
experiment and the different variables used makes him likely to have low
precision.
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suitable electrolytes for fuel cells
Answer:
Alkaline fuel cells use an alkaline electrolyte such as potassium hydroxide or an alkaline membrane that conducts hydroxide ions rather than protons.
Explanation:
OR USE GATORADE AND POWERADE. BE A MAN.
Who know the answers for both of these or know were to get them from
Answer:
kdkekejdjejeneneenendjenejekeke do do do do do do d
Answer:
go ahead bro
[tex]tex]\purple{\rule{45pt}{7pt}}\blue{\rule{45pt}{999999pt}}[/tex]
[tex]tex]\purple{\rule{45pt}{7pt}}\blue{\rule{45pt}{999999pt}}[/tex]
[tex]tex]\purple{\rule{45pt}{7pt}}\blue{\rule{45pt}{999999pt}}[/tex]
[tex]tex]\purple{\rule{45pt}{7pt}}\blue{\rule{45pt}{999999pt}}[/tex]
[tex]tex]\purple{\rule{45pt}{7pt}}\blue{\rule{45pt}{999999pt}}[/tex]
[tex]tex]\purple{\rule{45pt}{7pt}}\blue{\rule{45pt}{999999pt}}[/tex]
[tex]tex]\purple{\rule{45pt}{7pt}}\blue{\rule{45pt}{999999pt}}[/tex]
What compound is this?
Answer:
Carbon Tetrachloride
Explanation:
1 Carbon atom, 4 chlorine atoms (hence "tetra" prefix)
What is the mass of phosphorus that contains twice the number of atoms found in 14
g of iron?
[Relative atomic mass : P = 31; Fe = 56]
Answer:
15.5 gm
Explanation:
What is the mass of phosphorus that contains twice the number of atoms found in 14 g of iron?
[Relative atomic mass : P = 31; Fe = 56]
14 gm Fe = 14gm/ 56 gm/mole = 14 mole gm/56gm = 14/56 mole
0.25 moles
2 X 0.25 = 0.5 moles
1 mole P = 31 gm
so
0.5 moles P =31/2 =15.5 gm
density is 6g/mL and volume is 40 mL what is the mass
Answer:
240g
Explanation:
Using the equation m=pV, where m=mass, p=density, and V=Volume
m=(6)(40)=240
m=240
How might a molecule have a very strong molecular dipole?
Answer:
When you make the electronegativities of A(Positive partial charge) and C (Negative Partial charge) less and have B with a strong electronegativity to create a very strong molecular dipole. ... Both molecules possess strong molecular dipoles.
how many moles are present in 10.0 grams of sodium hydroxide
Answer:
0.25
Explanation:
no.of moles =10/40
8 Fe + S8 → 8 FeS, how many moles of iron (Fe) are needed to react with 8.49 moles of sulfur (S8)?
Based on the balanced equation, the mole ratio of Iron to Sulphur is 8 to 1.
This means that for every mole of sulfur, 8 moles of iron is needed for the reaction.
∴ since the moles of Sulfur = 8.49 moles
⇒ moles of Iron = 8.49 moles × 8
= 67.92 moles
Help with this question which I attached a picture of
[tex]\huge\underline\mathtt\colorbox{cyan}{A. Element L}[/tex]
Explanation:
Because the unidentified element has exactly the same Bright-Line Spectra of wavelength in nanometeres as does element L.
[tex]\huge\bold{\purple{\bold{⚡BeBrainly⚡}}} [/tex]
Sulphuric acid (H2SO4) is titrated against 25.00cm3 of 0.200 mol/dm3 Sodium hydroxide solution (NaOH). It is found that 23.20 cm3 of sulphuric acid is required for neutralization. Calculate the concentration of Sulphuric acid
1) What is the most dangerous room in the world? How is it secured?
Answer:
Radioactive Basement in Chernobyl
"We had to be especially cautious near roads and in the city of Pripyat, there are regular security patrols in those areas. Unfortunately, the legal 'day' tours are not allowed to enter any of the buildings in Pripyat as the structural integrity of some buildings is questionable."
Explanation:
When a substance is heated ,the kinetic energy of its molecules
Answer:
When a substance is heated ,the kinetic energy of its molecules also increase.
Explanation:
K.E is directly proportional to T
Which of the following correctly completes the statement?
Cations are always _____ than the parent atom and anions are always _____ than the parent atom.
Answer: smaller, larger
Explanation:
Cations are always {smaller} than the parent atom. Anions are always {larger} than the parent atom.
Cations are always smaller than the parent atom, and anions are always greater than the parent atom.
What is parent atom ?The term "parent atom" refers to an atom that has not yet undergone any chemical transformation. A parent atom is one that is discovered in its initial state.
Because they contain fewer electrons while maintaining the same nuclear charge, cations are always smaller than their parent atoms. Because the protons in the nucleus are holding the remaining electrons more tightly, their radii are less than those of the parent atoms. In the case of anion, this is the opposite.
Due to variations in electron-electron repulsion, the ionic radii of cations and anions are always less or bigger than the parent atom, respectively. The trends in ionic radius follow those in atomic size.
Thus, Cations are always smaller than the parent atom, and anions are always greater than the parent atom.
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Suppose you discovered a Group 2 element that has an atomic number larger than radium (Ra). What do you expect the melting and boiling points to be? Explain.
Answer: The melting point would be lower and the boiling point would be higher
Explanation: From Beryllium to Barium the melting point and the boiling point were constantly decreasing. after that, Radium's boiling point starts to increase in temperature. So I would assume that if there was an element in group 2 with a higher atomic number than Radium it's melting point would continue decreasing while the boiling point increased.
When, we discovered a Group 2 element having an atomic number larger than radium (Ra). Then, we expect that the melting and boiling points of Group 2 elements generally decrease as you move down the group. This is because the outermost electrons are farther from the nucleus due to the increased number of electron shells.
Group 2 elements are alkaline earth metals, and they exhibit certain trends in their physical properties as you move down the group in the periodic table. Radium (Ra) is the last naturally occurring element in Group 2. If we discover a hypothetical Group 2 element with an atomic number larger than radium, it would likely be an artificially synthesized element, and its properties would be subject to speculation.
As we move down Group 2, the atomic number increases, and the elements have more electron shells. This leads to several trends:
Melting and Boiling Points:
The melting and boiling points of Group 2 elements generally decrease as you move down the group. This is because the outermost electrons are farther from the nucleus due to the increased number of electron shells. As a result, the metallic bonds that hold the atoms together weaken, making it easier to break the lattice structure and transition from solid to liquid or gas.
If the hypothetical Group 2 element has an atomic number larger than radium, it would likely have more electron shells and thus a lower melting and boiling point compared to radium. This trend follows the pattern observed in other Group 2 elements.
Density:
Group 2 elements also tend to become less dense as you move down the group. This is because the increase in electron shells leads to larger atomic sizes, and the increased atomic volume decreases the packing efficiency in the solid state.
A Group 2 element with an atomic number larger than radium would likely have a lower density than radium, following the trend observed in the rest of the group.
Reactivity:
Group 2 elements become more reactive as you move down the group. This is because the outermost electrons are farther from the nucleus and are more easily lost, leading to more vigorous chemical reactions, especially with water and oxygen.
The hypothetical Group 2 element might exhibit increased reactivity compared to radium and other elements in the group.
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Look at the Recording station detector on the upper left side of the Gizmo. What happens when the seismic waves hit the recording station?
Answer:
I don’t know what recording station you’re referring to but, When seismic waves reach the seismograph, a graphical record, or seismogram, is produced
Explanation:
The seismic waves hitting the recording station has been resulted in the seismograph, that has been evident of the earthquake.
The seismic wave has been the radiation, with the result of the movement of the earth surface. The movement has been result in the earthquake.
The intensity of the earthquake has been measured by seismograph on the Richter scale. The seismic wave results in the movement of the leads to the production of the seismograph.
The seismic waves hitting the recording station has been resulted in the seismograph, that has been evident of the earthquake.
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THIS IS DUE LIKE REALLY SOON I RLLY NEED HELP :,)
What does it mean for a unit to be "derived"?
Answer:
you differentiate to find the derivative
Explanation:
Answer:
A derived unit is a unit that results from a mathematical combination of SI base units.
OR
A unit of measurement obtained by multiplication or division of the base units of a system without the introduction of numerical factors.
Explanation:
i dont know if that answered your question
Why and how does heat transfer? When does it stop transferring?
The transfer of heat will continue as long as there is a difference in temperature between the two locations. Once the two locations have reached the same temperature, thermal equilibrium is established and the heat transfer stops.
Heat is transferred from a warm body to a cooler body. The temperature of the warm body drops while the temperature of the cooler body rises. When the two temperatures are equal, thermal equilibrium is attained, and the heat transfer stops.
Why is it important to possess fundamental research skills in pursuing your study?
Answer:
Research Skills enable people to identify a problem, collect informational resources that can help address the problem, evaluate these resources for quality and relevance and come up with an effective solution to the problem.
Explanation:
It is important because it might increase you critical thinking skills and it's much more easy for you to collect data. It also helps you analyze information from different sources off the internet.
Pls help me, I’ll give 30 points
What’s boiling/melting point
Answer:
Melting point is the temperature at which solid and liquid phases of a substance are in equilibrium.
Boiling point is the temperature at which its vapour pressure is equal to the external pressure.
Answer:
melting point is the temperature at which a solid changes into a liquid.
boiling point, temperature at which the pressure exerted by the surroundings upon a liquid is equaled by the pressure
Explanation:
