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Related Questions
I need help with this
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2. 115
THIS IS TO REACH 20 CHARACTERS
2. 115
I hope this helps:)
Who know the answers for both of these or know were to get them from
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Answer:
kdkekejdjejeneneenendjenejekeke do do do do do do d
Answer:
go ahead bro
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The primary way in which the amount of carbon dioxide in the atmosphere can be increased is by ____.
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the burning of fossil fuels
density is 6g/mL and volume is 40 mL what is the mass
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Answer:
240g
Explanation:
Using the equation m=pV, where m=mass, p=density, and V=Volume
m=(6)(40)=240
m=240
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
Answers
Approximately 0.108 mol dm^-3
Explanations,
1. Make the balance chemical equation
2. Convert the 25 cm^3 to 0.025 dm^3 by multiplying 25 with 10^-3 (or 25 / 1000)
3. Concentration is equal to = moles of substance over volume of solution
4. Calculate how many number of moles present in 0.025dm^3 of sulphuric acid.
Mole = concentration x volume
^ rearranged from conc = mole/volume
Mole = 0.200 x 0.025 = 0.005 mol
5. Use the balance chemical equation ad mole ratio. In this case,
H2SO4 + 2NaOH —> 2H2O + Na2(SO4)
Thus the ratio between Sulphuric acid and Sodium Hydroxide is 1:2
Hence, the mole of H2SO4 is 0.005/2 = 0.0025 mol
6. Calculate the concentration of the sulphuric acid by using conc. = mole/volume
Hence the answer is 0.0025/(23.20 x 10^-3) = 0.108 mol dm^-3 rounded off at the 3 Sigfigs
I hope u understand sorry for any mistakes done.
how many moles are present in 10.0 grams of sodium hydroxide
Answers
Answer:
0.25
Explanation:
no.of moles =10/40
Describe how you could adjust the settings of the simulation to increase the number of red (H3O+) and blue (A-) particles in the solution of equilibrium. In three to four sentences, justify your answer and explain how and why this would change the pH of the solution.
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The circumstances that the system is exposed to may be altered in such a way as to cause a change in the chemical equilibrium. When we do this, we are said to be "stressing the balance."
In a chemical process that has reached equilibrium, one method is to either add or remove a product or a reactant. When more of a reactant is introduced, the equilibrium changes to alleviate the pressure, which results in the production of more products.
This is further explained below.
how and why this would change the pH of the solution.?Generally, When more product is introduced, the equilibrium moves away from products and toward reactants in an effort to lower the level of stress.
In the event that either the reactant or the product is withdrawn from the system, the equilibrium changes such that more of the corresponding substance is produced to compensate for the loss.
According to Ch/atelier's Principle, which claims that if a reaction in equilibrium is disturbed, the equilibrium will change to counterbalance that change, this indicates that if a reaction is in equilibrium, the equilibrium will alter to counteract that change.
If a solution has a large number of hydrogen ions, the pH of the solution will be low, and it will be classified as an acidic solution.
In conclusion, On the other hand, a solution is said to have a high pH and be in the basic state if it contains a low quantity of hydrogen ions in its composition.
The ratio of the concentration of hydrogen ions to the concentration of hydroxide ions is negative and inversely proportional.
Read more about equilibrium
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How many formula units are in 0.0022 mol of NaCl (it’s urgent plz)
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Answer:
1.204 × 10²¹ unitsExplanation:
The number of formula units can be found by using the formula
N = n × L
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
N = 0.002 × 6.02 × 10²³
We have the final answer as
1.204 × 10²¹ unitsHope this helps you
Pls help me, I’ll give 30 points
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THIS IS DUE LIKE REALLY SOON I RLLY NEED HELP :,)
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1) What is the most dangerous room in the world? How is it secured?
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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:
Why is it important to possess fundamental research skills in pursuing your study?
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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.
is it possible for a molecule to have polar bonds and not have a net dipole?
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the basic fact that determines molecular shapes is that
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Answer:
The shape of a molecule is mostly determined by repulsion among the pairs of electrons around a central atom.
You think you have found a diamond. Its mass is 5.28 g and its volume is 2 cm3.What did you find? What is its density?
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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?
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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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Which of the following correctly completes the statement?
Cations are always _____ than the parent atom and anions are always _____ than the parent atom.
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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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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]
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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
suitable electrolytes for fuel cells
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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.
How to round the number 314.77 to 2 significant figures
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Answer:
发你如果热客人看看如果
Explanation:
Answer:
result = 310
significant figures = 2
Explanation:
How to round significant figures:
look the first non-zero digit if rounding to one significant figure, look the digit after the first non-zero digit if rounding to two significant figures. draw a vertical line after the place value digit that is required.look at the next digit.
result = 310
significant figures = 2
What’s boiling/melting point
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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:
a 50.0 ml beaker contains 680. g mercury what is the density of mercury
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Answer:
5.43 grams
Explanation:
because, Its one of the smallest planets, and is also very close to the Sun.
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.
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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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4NaCl + 2SO2 + _____H2O + _____O2 → _____Na2SO4 + 4HCl
Which numbers balance this equation?
- 1,2,4
- 1,2,2
- 2,1,2
- 2,1,4
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The numbers that balance the following equation: 4NaCl + 2SO2 + H2O + O2 → Na2SO4 + 4HCl is 2, 1, 2.
BALANCING EQUATION:
Balancing a chemical equation means to make sure that the number of atoms of each element on both sides of the equation are equal. According to this question, the following chemical reaction are given: 4NaCl + 2SO2 + H2O + O2 → Na2SO4 + 4HCl Some of the coefficients (numbers) have been placed there while some are missing. The equation that includes the missing coefficients (numbers) to balance the equation is:4NaCl + 2SO2 + 2H2O + O2 → 2Na2SO4 + 4HCl
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Answer:212
Explanation:yeah
Look at the Recording station detector on the upper left side of the Gizmo. What happens when the seismic waves hit the recording station?
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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.
For more information about earthquake, refer to the link:
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Kinda confused on this. i need some help.
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To start, check to make sure it isn’t already balanced. If coefficients aren’t present, it’s assumed to be one. In this case, there’s just one aluminum on both sides, but the right hand side has one more fluorine than the left. This means that we’ll have to change the coefficients to make them match. Since we can’t multiply the two fluorines to make three with a whole number, we have to change this one and the one in front of the aluminum fluoride. Let’s put a 3 in front of F2 and a 2 in front of AlF3. So far, we have:
Al + 3F2 -> 2AlF3
Check the number of fluorines; sure enough, we have six on both sides. However, we’ve imbalanced the aluminums by balancing the fluorines. The fix is easy, though; change the coefficient from one to two in front of the aluminum to make them match. The result is therefore:
2Al + 3F2 -> 2AlF3
Check your element totals again; sure enough, they’re all balanced. This is the balanced chemical equation.
Hope this helps!
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
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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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What compound is this?
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Answer:
Carbon Tetrachloride
Explanation:
1 Carbon atom, 4 chlorine atoms (hence "tetra" prefix)
What does it mean for a unit to be "derived"?
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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?
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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.
