Answers
Answer:
The material properties of nanostructures are different from the bulk due to the high surface area over volume ratio and possible appearance of quantum effects at the nanoscale. ... Yu; they found that the structural distortions on the quantum dots depend both on the kind of dopant and on the size of the dots.
Explanation:
hope it helps
Related Questions
first one is the answer
Answers
Answer:
but where is yr question????
Answer:
Where is your question bro
please helpppppppp
MATERIALS
2 shoe boxes or any other boxes that are similar in size
Sheet of clear plastic (plastic wrap) or a pane of glass
2 thermometers for measuring air temperatures
Watch or stop watch
Paper and pen to record temperature results
2 lamps (only needed if it's a cloudy day)
INSTRUCTIONS
Draw a table on your piece of paper to record temperature readings for each box. You can use this template or a table similar to it:
Place a thermometer inside each box; facing up so you can read the temperature.
Tightly cover one of the boxes with clear plastic or glass. Leave the other box open.
Place the boxes in direct sunlight so the bottom of the box is filled with light. If it is a cloudy day, you can use two lamps, setting them directly over each box so that their light shines directly into the boxes. You can use one lamp if it can give equal light to both boxes.
Record the temperature in the boxes once each minute for fifteen minutes.
Remove the boxes from the direct sunlight and continue to record the temperature for another fifteen minutes.
Once you have recorded all of your results, respond to the questions below.
Questions:
In which box did the temperature rise faster?
In which box did the temperature rise higher?
How did the temperatures in the boxes change after removing them from the sunlight?
How does this experiment demonstrate the greenhouse effect?
What does each item used in the experiment represent in the actual greenhouse effect on Earth? For instance, the light used in the experiment represents the Sun. What does the bottom of the box, air in the box, and plastic wrap each represent in the greenhouse effect?
If you can, compare your results with another student and explain the differences or similarities in your findings.
What did you learn from this investigation?
Answers
1. The temperature rose faster in the covered box.
2. The temperature rose higher in the covered box.
3. The temperature in both boxes decreased after removing them from the sunlight.
4. This experiment demonstrates how a greenhouse traps heat inside, causing the temperature to rise.
5. The bottom of the box represents the Earth's surface, the air in the box represents the Earth's atmosphere, and the plastic wrap represents the greenhouse gases that trap heat.
6. You can compare your results with another student to see if your findings are similar or different.
7. From this investigation, you can learn about how greenhouse gases trap heat and cause the Earth's temperature to rise.
What is greenhouse ?
A greenhouse is a structure designed to control the environment for growing plants. It is typically made of glass or other transparent material, and traps heat from the sun, creating a warm and humid environment inside. This helps to extend the growing season and protect plants from extreme weather conditions.
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Which of the following equations has been balanced correctly?
O a. 2ZnS + 302 -> 2ZnO + 2SO2
O b. ZnS + 02 --> ZnO + SO2
O c. ZnS + 02 -> 2ZnO + SO2
O d. All of the above
O e. None of the above
Answers
The correct equation that has been balanced is option (c): ZnS + 02 -> 2ZnO + SO2. This equation is balanced because the number of sulfur atoms (1 on each side) and the number of oxygen atoms (2 on each side) are equal.
The correct equation that has been balanced is option (c): ZnS + 02 -> 2ZnO + SO2. To determine whether an equation is balanced, we need to ensure that the number of atoms of each element is the same on both sides of the equation. Let's analyze each option:
(a) 2ZnS + 302 -> 2ZnO + 2SO2: This equation is unbalanced because there are an unbalanced number of oxygen atoms (7 on the left side and 4 on the right side) compared to the amount of sulphur atoms (2 on each side).
(b) ZnS + 02 --> ZnO + SO2: This equation is unbalanced because there are an unbalanced number of oxygen atoms (2 on the left side and 3 on the right side) compared to the sulphur atoms (1 on each side).
(c) ZnS + 02 -> 2ZnO + SO2: This equation is balanced because the number of sulfur atoms (1 on each side) and the number of oxygen atoms (2 on each side) are equal. Therefore, option (c) is the only equation that has been balanced correctly.
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What mass of aluminum has a total nuclear charge of 1.6 CC? Aluminum has atomic number 13. Suppose the aluminum is all of the isotope with 14 neutrons. slader
Answers
Answer:
aluminium is all of isotope with 14 neutrons .
which is the graph of the function g(x) = f(-x)
Answers
To graph the function g(x) = f(-x), you can start with the graph of f(x) and then reflect it about the y-axis.
What is a graph of the function g(x) = f(-x)?To find the graph of the function g(x) = f(-x), we can start with the graph of the function f(x) and then reflect it about the y-axis.
If the graph of f(x) is symmetric with respect to the y-axis, meaning it is unchanged when reflected, then g(x) = f(-x) will have the same graph as f(x).
However, if the graph of f(x) is not symmetric with respect to the y-axis, then g(x) = f(-x) will be a reflection of f(x) about the y-axis.
In either case, the resulting graph of g(x) = f(-x) will be symmetric with respect to the y-axis.
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What will happen to the equilibrium system when adding HCl to aqueous solution of Na2SO4?
Answers
When HCl is added to aqueous solution of sodium sulphate aqueous solution, sulfuric acid is formed, and the solution's chemical makeup and acidity get changed.
Thus, several chemical reactions happen when HCl is introduced to a sodium sulphate aqueous solution. While sodium sulphate breaks down into 2 Na+ ions and SO4^2- ions, HCl splits into H+ and Cl- ions. When the H+ ions from HCl interact with the SO4^2- ions, sulfuric acid, a more potent acid, is created.
The solution's H+ ion concentration rises as a result of this reaction, altering the equilibrium in favor of the products. As a result, the system's equilibrium is upset, which causes sulfuric acid to form. The solution's chemical makeup and acidity ultimately alter as a result of the addition of HCl.
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A type of emergency apparatus that can be used where oxygen may be limited or where the air might be poisoned is based on the following reaction in which CO2 produced by your own respiration reacts and O2 gas is produced. Calculate the mass of KO2 needed to produce 25 g of oxygen gas.
4 KO2(s) + 2 CO2(g) 2 K2CO3(s) + 3 O2 (g)
Answers
Answer:
so I don't know how to answer that
PLEASE HELP ME! do tectonic plates play a major or minor role in the ROCK CYCLE
i will choos e branliest
Answers
Which type of biochemical is shown in this illustration?
carbohydrate
nucleic acid
lipid
protein
Answers
Answer:
C
Explanation:
i did the test
5.0 Mol Al reacts with 6.0 mol O2 to form Al2O3.
How many moles of Al2O3 form when 6.0 mol O2 are used up?
Answers
Answer: The answer is 4
Explanation:
Compare 2 organizations frm different industries same job title
Answers
Explanation:
Explanation:A job title describes someone specific job or position , like "podiatrist". where as an occupation refers to a broader title or the entire industry in which someone works , like "doctor." many people can share the same occupation without sharing the same job title.
Explanation:A job title describes someone specific job or position , like "podiatrist". where as an occupation refers to a broader title or the entire industry in which someone works , like "doctor." many people can share the same occupation without sharing the same job title.hope it helps you like me plz
Identify the correct coefficients to balance the redox reaction with the lowest possible integer coefficients.
_Ag1+ + _AI -->
_Al3+ + _Ag
Answers
Answer:
\(\rm 3\; Ag^{1+} + 1\; Al \to 1\; Al^{3+} + 3\; Ag\).
Explanation:
Electrons are conserved in a chemical equation.
The superscript of \(\rm Ag^{1+}\) indicates that each of these ions carries a charge of \(+1\). That corresponds to the shortage of one electron for each \(\rm Ag^{+}\) ion.
Similarly, the superscript \(+3\) on each \(\rm Al^{3+}\) ion indicates a shortage of three electrons per such ion.
Assume that the coefficient of \(\rm Ag^{+}\) (among the reactants) is \(x\), and that the coefficient of \(\rm Al^{3+}\) (among the reactants) is \(y\).
\(\rm \mathnormal{x}\; Ag^{1+} + ?\; Al \to \mathnormal{y}\; Al^{3+} + ?\; Ag\).
There would thus be \(x\) silver (\(\rm Ag\)) atoms and \(y\) aluminum (\(\rm Al\)) atoms on either side of the equation. Hence, the coefficient for \(\rm Al\!\) and \(\rm Ag\!\) would be \(y\!\) and \(x\!\), respectively.
\(\rm \mathnormal{x}\; Ag^{1+} + \mathnormal{y}\; Al \to \mathnormal{y}\; Al^{3+} + \mathnormal{x}\; Ag\).
The \(x\) \(\rm Ag^{1+}\) ions on the left-hand side of the equation would correspond to the shortage of \(x\) electrons. On the other hand, the \(y\) \(Al^{3+}\) ions on the right-hand side of this equation would correspond to the shortage of \(3\, y\) electrons.
Just like atoms, electrons are also conserved in a chemical reaction. Therefore, if the left-hand side has a shortage of \(x\) electrons, the right-hand side should also be \(x\!\) electrons short of being neutral. On the other hand, it is already shown that the right-hand side would have a shortage of \(3\, y\) electrons. These two expressions should have the same value. Therefore, \(x = 3\, y\).
The smallest integer \(x\) and \(y\) that could satisfy this relation are \(x = 3\) and \(y = 1\). The equation becomes:
\(\rm 3\; Ag^{1+} + 1\; Al \to 1\; Al^{3+} + 3\; Ag\).
Commercially prepared cloning vectors such as pUC18 are designed to contain several useful features. An example of one of these features is ________.
Answers
Vectors may be plasmids. An example of one of several useful features of commercially prepared cloning vectors is MULTIPLE CLONING SITES.
The pUC18 vector is a widely used standardized cloning vector for replication in Escherichia coli.
A multiple cloning site can be defined as a short DNA fragment observed in genetically engineered plasmids.
These DNA fragments (multiple cloning sites) contain twenty (20) or more sites where restriction enzymes can cut in order to generate recombinant DNA molecules.
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Need help with this two part question
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The ideal gas law and stoichiometry must be used to calculate the volume of carbon dioxide gas produced by the breakdown of 4.09 g of calcium carbonate at STP (Standard Temperature and Pressure).
Use the molar mass of calcium carbonate (CaCO3) to determine how many moles it contains. CaCO3 has a molar mass of 100.09 g/mol.
CaCO3 mass divided by its molar mass equals the number of moles of CaCO3: 4.09 g/100.09 g/mol.
The number of moles of carbon dioxide (CO2) generated may be calculated using the stoichiometric ratio from the balancing equation. By using the equation:
A unit of CaCO3 and CO2 is produced.
CO2 moles equal the same number of moles of CaCO3.
Use the ideal gas law to translate the volume of carbon dioxide into moles.
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8.0g of certain gas occupies 5.6 L at STP.
A) How many moles of gas are present?
B) What is the molar mass of the gas?
C) What is the common atmospheric gas was collected?
Answers
Answer:
A) Using the ideal gas law, we can calculate the number of moles of gas present:
```
PV = nRT
```
where:
* P = pressure (atm) = 1 atm
* V = volume (L) = 5.6 L
* n = number of moles of gas
* R = ideal gas constant = 0.08206 L atm / mol K
* T = temperature (K) = 273.15 K
Solving for n, we get:
```
n = (P * V) / RT
```
```
n = (1 atm * 5.6 L) / (0.08206 L atm / mol K * 273.15 K)
```
```
n = 0.25 mol
```
Therefore, there are 0.25 moles of gas present.
B) The molar mass of the gas can be calculated by dividing the mass of the gas (8.0 g) by the number of moles of gas (0.25 mol):
```
Molar mass = Mass / n
```
```
Molar mass = 8.0 g / 0.25 mol
```
```
Molar mass = 32 g/mol
```
The molar mass of the gas is 32 g/mol.
C) The common atmospheric gas with a molar mass of 32 g/mol is oxygen (O2). Therefore, the gas that was collected is oxygen.
Explanation:
Hello please someone help me with this
Answers
An equation is formed of two equal expressions. The value of x in the given equation can be -5.237 or 3.437.
What is an equation?An equation is formed when two equal expressions are equated together with the help of an equal sign '='.
In the given equation, the value of x can be found as shown below,
x²/(0.001 - x) = 1.8 × 10⁻⁴
x²/(0.001 - x) = 1.8/10000
x² · 10000 = (0.001 - x) · 1.8
\(x=\dfrac{-0.00018+\sqrt{0.0000007524}}{2},\:x=\dfrac{-0.00018-\sqrt{0.0000007524}}{2}\)
x = -5.237, 3.437
Hence, the value of x in the given equation can be -5.237 or 3.437.
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In Which State of matter are molecules moving the slowest
A. Solid
B. Liquid
C. Gas
Answers
Answer:
Solid
Explanation:
Molecules in solids only vibrate in place, while the other two have moving molecules
At 52°C, the pressure inside a gas-filled container is 467 kPa.
What is the absolute temperature of the gas?
O 163 K
O 325 K
O 335 K
O 651 K
Answers
The absolute temperature of the gas is 325 K.
To determine the absolute temperature of the gas, we need to convert the given temperature from Celsius to Kelvin. The Kelvin scale is an absolute temperature scale where 0 K represents absolute zero, which is the lowest possible temperature.
To convert from Celsius to Kelvin, add 273.15 to the Celsius value. In this case, the given temperature is 52°C. So, to convert it to Kelvin, we perform the following calculation:
Temperature in Kelvin = 52°C + 273.15 = 325.15 K
Therefore, the absolute temperature of the gas is 325.15 K.
It's important to note that the Kelvin scale is used in scientific calculations involving temperature because it directly corresponds to the average kinetic energy of particles in a substance. Absolute zero on the Kelvin scale (0 K) represents the complete absence of molecular motion. The Kelvin scale is particularly useful in gas laws and other thermodynamic calculations as it provides a meaningful reference point.
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if two objects are in contact with each other and object A is at a lower temperature than object B, which of the following statements is correct?
a. the temperature of object A will decrease
b.the temperature of object B will decrease
c.both objects will remain the same temperature
d.heat energy will flow from object A to object B
Answers
What system is used to help match DNA from crime scenes to a DNA database?
A.
CODIS
B.
AFIS
C.
NIBIN
D.
FBI
Answers
Answer:
A. CODIS
Explanation:
The Combined DNA Index System (CODIS), administered by the FBI, maintains DNA profiles obtained through federal, state, and local DNA sample collection programs, and makes this information available to law enforcement agencies across the country for law enforcement identification purposes.
how many moles of glucose do I have if I have 26 grams of glucose
Answers
Answer:
0.1443194637888042 moles
Explanation:
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How many moles of H atoms are there in 2 moles of CH3CH2CH2CH3?
Answers
AnSweR: 10
ExplanAtion: My random idiot friend just told me
how is hesses law used to calculate the enthalpy of a reaction
Answers
Answer:
Explanation:
Hess’s law derives directly from the law of conservation of energy, as well as its expression in the first law of thermodynamics. By Hess’s law, the net change in enthalpy of the overall reaction is equal to the sum of the changes in enthalpy for each intermediate transformation: ΔH = ΔH1+ΔH2+ΔH3.
I need help on this question plzzz
Answers
Answer:
76 ml
0.076 L
Explanation:
hope that helps
Answer:
76 for the first one at least I think
A prescription for amoxicillin comes in an oral suspension that is 200 mg /5 mL. A patient is prescribed 500 mg every six hours. How many milliliters of amoxicillin should the patient take per dose?
Answers
This problem is providing us with the concentration of an oral suspension of amoxicillin as 200 mg / 5 mL, so the volume per dose is required, taking into account a patient must take 500 mg every six hours. At the end, the result turns out to be 12.5 mL according to:
Dimensional analysisIn chemistry, we use dimensional analysis to calculate a requirement, based on given information to do so. Despite not having a formula for every problem, one can use the units a reference.
For instance, this problem asks for volume yet 200 mg / 5 mL has the volume at the bottom of the proportional factor. This means we need to flip it and then multiply by 500 mg in order to get rid of the milligrams and thus get the volume:
\(V=500mg*\frac{5mL}{200mg} \\\\V=12.5mL\)
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which has more gravity
A. Earth
B. Sun
C. Saturn
Answers
B
the sun!
yay
!!!!!!!!!!!
Answer:
EARTH
Explanation:
Earth‘s gravity, as already noted, is equivalent to 9.80665 m/s² (or 32.174 ft/s²). This means that an object, if held above the ground and let go, will accelerate towards the surface at a speed of about 9.8 meters for every second of free fall.
How many atoms of phosphorus are in 4.70 mol of copper(II) phosphate?
Answers
The number of atoms of phosphorus that would be in 4.70 mol of copper (II) phosphate is 56.61 x \(10 ^{23\) atoms.
Avogadro's numberAccording to an established rule, 1 mole of any substance contains one Avogadro's number, which is 6.022 x \(10 ^{23\) atoms.
Copper (II) phosphate contains atoms of copper, phosphorus, and oxygen. In ion form, the compound ionizes according to the following equation:
\(Cu_3(PO_4)_2 --- > 3 Cu^2^+ + 2P^4^+ + 8O^2^-\)
This means that every 1 mole of copper (II) phosphate contains 2 moles of phosphorus. The equivalent mole of phosphorus in 4.70 mol of copper (II) phosphate would be:
= 4.70 x 2
= 9.4 mol of phosphorus.
We said 1 mole of any substance = 6.022 x \(10 ^{23\) atoms.
Hence, 9.4 moles of phosphorus will contain:
9.4 x 6.022 x \(10 ^{23\) atoms
= 56.61 x \(10 ^{23\) atoms
In other words, 4.70 mol of copper (II) phosphate will contain 56.61 x \(10 ^{23\) atoms of phosphorus.
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HELP PRLEASEE!!.!!.
Answers
The concentration of A is decreasing faster than A₂ increases.
option C.
What is the rate of reaction?The rate of reaction, also known as the reaction rate, is a measure of how quickly a chemical reaction takes place.
Reaction rate represents the change in concentration of reactants or products per unit of time.
The given relationship between the two concentrations;
2A ⇆ A₂
make A₁ the subject of the formula;
A = ⇆ A₂ / 2
From the equation given above we can see that the concentration A is decreasing at a faster rate compared to concentration of A₂.
Thus, according to the graph, the concentration of A is decreasing faster than A₂ increases.
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Strontium hydroxide reacts with hydrobromic acid to produce Strontium bromide and
water.
Write and balance the chemical reaction above, use it for problems 1-4 below:
1. If 5.50 moles of strontium hydroxide were consumed, how much moles of water are
produced?
2. Find the mass of hydrobromic acid used to produce 7.50 moles water.
3. If 10.8 g of strontium hydroxide were used, how much moles of strontium bromide are
produced?
4. If 13.3 g of hydrobromic acid were consumed, find the mass of the water produced.
Answers
Sr(OH)2 + 2 HCl --> SrCl2 + 2 H2O
To find the moles of water produced when 5.50 moles of strontium hydroxide are consumed, we need to apply the law of conservation of mass. The mass of water produced is equal to the mass of strontium hydroxide consumed. Since strontium hydroxide has a molar mass of 142 g/mol and water has a molar mass of 18 g/mol, 1 mol of strontium hydroxide can produce 9 mol of water. Therefore, 5.50 moles of strontium hydroxide can produce 49.5 mol of water.
Similarly, 7.50 moles of water can be produced by reacting 18 moles of hydrobromic acid with strontium hydroxide. Hydrobromic acid has a molar mass of 79.9 g/mol, so 18 moles of hydrobromic acid would have a mass of 79.9 * 18 = 1435.2 g.
To find the moles of strontium bromide produced when 10.8 g of strontium hydroxide is used, we need to apply the law of conservation of mass again. The mass of the strontium bromide produced is equal to the mass of strontium hydroxide consumed. Since strontium bromide has a molar mass of 410 g/mol and strontium hydroxide has a molar mass of 142 g/mol, 1 mol of strontium bromide can consume 3.23 moles of strontium hydroxide. Therefore, 10.8 g of strontium hydroxide can produce 10.8 / 3.23 = 3.34 moles of strontium bromide.
Finally, to find the mass of water produced when 13.3 g of hydrobromic acid is consumed, we need to apply the law of conservation of mass yet again. The mass of the water produced is equal to the mass of hydrobromic acid consumed. Since hydrobromic acid has a molar mass of 79.9 g/mol, 13.3 g of hydrobromic acid would produce 13.3 / 79.9 = 0.166 moles of water.
What is the most resistant to thermal energy transfers.
A. Copper wire
B. Aluminum foil
C. Water
D. Foam insulation
Answers
Answer: C. Water
Explanation: