Why do different elements emit different colors of light?
Answers
Answer:
Different elements emit differently colors of light because when electrons return to the lower energy levels, they emit energy in a different form of light
Explanation:
Related Questions
Does the solubility of a solid increases with increasing temperature?
Answers
Yes, More heat speeds up the dissolving reaction by supplying energy to break bonds in the solid. This is the most prevalent case in which an increase in temperature causes an increase in solid solubility.
What happens to the solubility of a solid?As the temperature of the solution rises, so does the average kinetic energy of the solute molecules. As a result, the molecules are less able to stick together and disintegrate more easily. As a result, increasing the temperature increases the solubility of solid states.
Solute and solvent crystal structures must be identical. When the solvent and solute have the same valency, complete solubility occurs. A metal with a higher valency is more likely to dissolve a metal with a lower valency. The electronegativity of the solute and solvent should be comparable.
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Potassium metal reacts with chlorine gas to form solid potassium chloride. Answer the following:
Write a balanced chemical equation (include states of matter)
Classify the type of reaction as combination, decomposition, single replacement, double replacement, or combustion
If you initially started with 78 g of potassium and 71 grams of chlorine then determine the mass of potassium chloride produced.
Answers
The balanced chemical equation between pottasium and chlorine is as follows: 2K + Cl₂ → 2KCl. It is a combination reaction.
What is a chemical reaction?A chemical reaction is a process, typically involving the breaking or making of interatomic bonds, in which one or more substances are changed into others.
According to this question, a chemical reaction occurs between potassium metal and chlorine gas to form pottasium chloride as follows:
2K + Cl₂ → 2KCl
The chemical reaction is a combination reaction because it involves the combination of two elements to form a compound.
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Convert 3.5mol of CO2 to grams.
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Which series reveals the source of energy for coal?
coal chemicals sun
coal plants chemicals
coal animals sun
coal plants sun
Answers
Answer:
coal chemicals sun
Explanation:
What was important about the Copernican revolution?
Answers
Answer:
C
Explanation:
it demonstrated that scientific understanding was always changing
You were asked to notice that the rim of the porcelain evaporating dish is unglazed, and observe what water will do to the unglazed side of the piece of terra cotta plant pot on your tray. This is why we preheated the evaporating dish prior to measuring the evaporating dishes initial mass. Brian suggests to Matt that if the evaporating dish was not preheated, the mass of the anhydrate will be heavier resulting in a greater value for the anhydrate, and a smaller value for "z" in this formula, CuxCly • zH2O. Do you agree or disagree? Justify your answer
Answers
Yes, I am agree with the evaporating dish is not preheated, then the mass of the anhydrate will be heavier, resulting in a greater value for the anhydrate and a smaller value for "z" in this formula:
CuxCly • zH2O
An anhydrate is a chemical compound that does not contain any water molecules. An anhydrate is formed when the water molecules present in a hydrate are removed through heating or another process. When we heat a hydrated compound, it results in the loss of water molecules from the compound, leading to the formation of an anhydrate.The anhydrate's mass is measured by calculating the difference in weight of the evaporating dish containing the hydrated sample and the weight of the empty evaporating dish. When we use an unpreheated evaporating dish, it results in the loss of weight as the water molecules are released from the hydrated compound. The water molecules released from the sample will condense on the cooler surface of the evaporating dish, which will lead to a higher weight than the actual weight of the anhydrate. Therefore, if the evaporating dish is not preheated, then the mass of the anhydrate will be heavier, resulting in a greater value for the anhydrate and a smaller value for "z" in this formula, CuxCly • zH2O.For such more questions on anhydrate
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How many hydrogens are in 3C2H3O2NH4?
A. 7 C. 12
B. 9 D. 21
Answers
Answer:
B
Explanation:
i hope makakatulong
basta yan lng ang alam ko
Answer:
B
Explanation:
bexhause there is 2H which already considered hydrogen and the others make it hydrogen
If crystal growth does not start on its own after the solution in the flask returns to room temperature, identify the best ways to promote this process. Select one or more: Add a bit of solid as a seed crystal. Scratch the bottom of the flask gently with a stirring rod. Place the flask on a hot plate to evaporate some solvent. Add ice cubes to the solution.
Answers
Answer: The best way to promote the process are:
--> Add a bit of solid as a seed crystal.
--> Scratch the bottom of the flask gently with a stirring rod.
Explanation:
A crystal growth is seen is SUPERSATURATED solutions which contains more solute than it can normally dissolve at that given temperature. It is usually very UNSTABLE and capable of releasing the excess solute if disturbed, either by shaking or seeding with a tiny crystals.
Crystallization can be used for the separation of two salts with different solubilities as well as for purification of a soluble salt that contains insoluble solid impurities. Recrystallization improves the validity of the process. Crystallization can be initiated by:
--> Scratching the bottom of the flask gently with a stirring rod: scratching initiates crystallization by providing energy from the high-frequency vibrations.
--> Adding a bit of solid as a seed crystal: Seed crystals create a nucleation site where crystals can begin growth.
How many mL of 12.0 M (molarity) of hydrochloric aqueous solution would be used to prepare 500.0 mL of a 0.100 M diluted solution?
Answers
We can use the formula:
M1V1 = M2V2
where M1 is the initial molarity, V1 is the initial volume, M2 is the final molarity, and V2 is the final volume.
In this case, we know:
M1 = 12.0 M
V1 = ?
M2 = 0.100 M
V2 = 500.0 mL = 0.500 L (since 1 mL = 0.001 L)
We can rearrange the formula to solve for V1:
V1 = (M2V2) / M1
Substituting the values we know, we get:
V1 = (0.100 M)(0.500 L) / 12.0 M
V1 = 0.00417 L = 4.17 mL
Therefore, we need to measure 4.17 mL of 12.0 M hydrochloric aqueous solution and add it to 500.0 mL of water to prepare 500.0 mL of a 0.100 M diluted solution.
why is Avogadro's number useful?
Answers
Avogadro's number is one of the fundamental constants of chemistry. It permits one to compare the different atoms or molecules of given substances where the same number of atoms or molecules are being compared.
determine the molar mass of an unknown gas if a sample weighing 0.389 g is collected in a flask with a volume of 102 ml at 97c the pressure of hte gas is 728mmhg
Answers
The molar mass of the unknown gas is approximately 31.27 g/mol.
To determine the molar mass of an unknown gas, use the ideal gas law equation:
PV = nRT
Where:
P = Pressure (in atm)
V = Volume (in liters)
n = Number of moles
R = Ideal gas constant (0.0821 L·atm/(mol·K))
T = Temperature (in Kelvin)
First, need to convert the given values to the appropriate units:
Pressure (P) = 728 mmHg = 0.961 atm
Volume (V) = 102 ml = 0.102 L
Temperature (T) = 97°C = 370 K (converted to Kelvin)
Next, rearrange the ideal gas law equation to solve for the number of moles (n):
n = PV / RT
Substituting the values:
n = (0.961 atm) * (0.102 L) / (0.0821 L·atm/(mol·K) * 370 K)
n = 0.01244 mol
Now , determine the molar mass (M) of the gas using the formula:
Molar Mass (M) = Mass (m) / Moles (n)
Given that the mass (m) of the gas is 0.389 g and the moles (n) calculated above is 0.01244 mol:
M = 0.389 g / 0.01244 mol
M ≈ 31.27 g/mol
Therefore, the molar mass of the unknown gas is approximately 31.27 g/mol.
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magnesium most common isotope
Answers
Magnesium has three stable isotopes, Mg-24, Mg-25, Mg-26. The most common isotope is Mg-24, which is 79% of all Mg found on Earth.
What is the measurement of the amount of light passing through the solution ?
Answers
If you have 50mg of a radioactive isotope, how much will remain after 1 Half Life? How much after 2 half lives?
Answers
Answer:The quantity of radioactive nuclei at any given time will decrease to half as much in one half-life. For example, if there were 100 g of Cf -251 in a sample at some time, after 800 years, there would be 50 g of Cf -251 remaining. After another 800 years (1600 years total), there would only be 25 g remaining.
Explanation:
Que tienen en comun el chocolate, las papas fritas y la hamburguesa?
Que tienen en comun los vegetales, el huevo y el pan?
Answers
Answer: todos terminan en tu boca
Explanation:
Hahaha
Help asap please.
NO LINKS!!!!!
Will mark as the brainliest.
Answers
Answer:
The answers to your questions are given below below
Explanation:
1. The calculation will require multiple steps because the unit of measurement of the theoretical and actual yield is different.
2. Determination of the percentage yield.
We'll begin by converting 6733 mg to g. This can be obtained as follow:
1000 mg = 1 g
Therefore,
6733 mg = 6733 mg × 1 g / 1000 mg
6733 mg = 6.733 g
Finally, we shall determine the percentage yield. This can be obtained as follow:
Theoretical yield = 14.79 g
Actual yield = 6.733 g
Percentage yield =?
Percentage yield = Actual yield /Theoretical yield × 100
Percentage yield = 6.733 / 14.79 × 100
Percentage yield = 673.3 / 14.79
Percentage yield = 45.5%
what is the difference between covalent bonding and electrovalent bonding
Answers
Answer:
1 ) Electrovalent compounds are formed by the complete transfer of electrons while covalent compounds are formed by sharing of electrons between 2 atoms.
2) Electrovalent compounds are more soluble in polar solvents like water while covalent compounds are more soluble in non-polar solvents like methane.
A sphere of radius 0.457 m, temperature 32.2 ∘
C, and emissivity 0.924 is located in an environment of temperature 82.9 ∘
C. At what rate does the sphere (a) emit and (b) absorb thermal radiation? (c) What is the sphere's net rate of energy exchange? (a) Number (b) Number Units Units
Answers
a) The sphere emits thermal radiation at a rate of 139.75 Watts.
b) The sphere absorbs thermal radiation at a rate of 37.66 Watts.
c) The sphere's net rate of energy exchange is 102.09 Watts.
What are the rates of thermal radiation emission, absorption, and net energy exchange for the sphere?To calculate the rates of thermal radiation emission and absorption, we can use the Stefan-Boltzmann law, which states that the rate of thermal radiation emitted or absorbed by an object is proportional to its surface area, temperature, and the Stefan-Boltzmann constant.
a) The rate of thermal radiation emitted by the sphere can be calculated using the formula:
Emitting Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(temperature^4 - environment\ temperature^4\))
Plugging in the given values:
Emitting Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((32.2 + 273.15)^4 - (82.9 + 273.15)^4)\)
Emitting Rate ≈ 139.75 Watts
b) The rate of thermal radiation absorbed by the sphere can be calculated in a similar way but using the environment temperature as the object's temperature:
Absorbing Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(environment\ temperature^4 - temperature^4\))
Plugging in the given values:
Absorbing Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((82.9 + 273.15)^4 - (32.2 + 273.15)^4)\)
Absorbing Rate ≈ 37.66 Watts
c) The net rate of energy exchange is the difference between the emitting rate and the absorbing rate:
Net Rate = Emitting Rate - Absorbing Rate
Net Rate = 139.75 Watts - 37.66 Watts
Net Rate ≈ 102.09 Watts
Therefore, the sphere emits thermal radiation at a rate of 139.75 Watts, absorbs thermal radiation at a rate of 37.66 Watts, and has a net rate of energy exchange of 102.09 Watts.
Note: The units for all the rates are Watts.
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PLEASE HELP
Upload a summary of your findings during this investigation. Be sure to answer the questions below and include your hypothesis, observations, data, interpretation, graph, and conclusion in your report.
What was the temperature of the ice before you added heat?
What was the temperature as the ice melted?
At what temperature did the water begin to boil?
Did the temperature of the water rise or remain constant as the water boiled?
If the temperature did not change while heat was being added, what was happening to the ice or the water at that time? Can you see this on the graph you created from your data?
What do you think the heat was used for if not to raise the temperature?
Was there room for human error in your investigation? Why or why not?
What did you learn from this investigation? Be thoughtful in your answer.
Answers
Summary of Findings:
Hypothesis:
The hypothesis of this investigation was that the temperature of the ice would increase as heat was added, eventually leading to the ice melting and the water boiling.
Observations:
- The ice began to melt as heat was added.
- The temperature of the water increased steadily after the ice had melted, eventually reaching boiling point.
- Upon reaching boiling point, the temperature of the water remained constant.
Data:
1. Initial ice temperature: -5°C (example value)
2. Temperature of melting ice: 0°C
3. Boiling point of water: 100°C
Interpretation:
- The temperature of the ice increased as heat was added until it reached the melting point.
- The temperature remained constant at 0°C during the melting process.
- The temperature of the water began to rise after the ice had melted, eventually reaching the boiling point.
- The temperature remained constant at 100°C while the water boiled.
Graph:
The graph should show the temperature of the ice and water over time, indicating the constant temperatures during the melting and boiling processes.
Conclusion:
As heat was added, the temperature of the ice increased until it reached the melting point. During the melting process, the temperature remained constant at 0°C. After the ice had melted, the water's temperature increased until it reached the boiling point, where it remained constant at 100°C.
The heat was used to cause phase changes in the ice and water, first turning the ice into water, and then turning the water into vapor. These phase changes were evident on the graph, as the temperature remained constant during these processes.
There was room for human error in this investigation, as measurements could have been inaccurate, or heat may have been added inconsistently. Furthermore, external factors such as air temperature or air pressure could have influenced the results.
From this investigation, we learned that the heat added to the ice and water was used to cause phase changes, and that the temperature remained constant during these processes. This highlights the importance of understanding the role of heat in phase changes and the behavior of substances when they undergo these changes.
in which of these compounds are there twice as many oxygen atoms as hydrogen atoms?
Answers
Answer:
G - H2SO4
Explanation:
two hydrogen atoms and 4 oxygen atoms
Mineral is --- 1) both neutral and artificial 2)only pure element 3)natural material 4) artificial material
Answers
Answer:Mineral is a natural material.
Explanation:Mineral is a solid natural inorganic substance.
Calculate the number of grams of sulfur in 1.34 mol of sulfur.
Express your answer in grams to three significant figures.
Help pleaaaseee
Answers
The molar mass of sulfur is 32.07 g/mol.
Define mole?The mole is the amount of substance in a system that contains as many elementary entities as there are atoms in 0.012 kilogramme of carbon 12; its symbol is "mol".
A mole is defined as the amount of a substance that contains exactly. 02214076 X 10 23 of the substance's elementary entities. A mole is the mass of a substance that has the same number of fundamental units as there are atoms in precisely 12.000 g of 12C.
In chemistry, a mole is a standard scientific unit for measuring large amounts of very small entities such as atoms, molecules, or other specified particles. Related Terms: atom, matter, and molecular weight Avogadro's formula.
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Which of the following 0.150 m solutions has the
greatest boiling-point elevation?
Mg(NO3)2
NaNO3
C2H4(OH)2
Answers
The solution with the greatest boiling-point elevation among the given options is Mg(NO₃)₂.
The boiling-point elevation of a solution depends on the concentration of solute particles. In this case, we have three solutions: Mg(NO₃)₂, NaNO₃, and C₂H₄(OH)₂.
Mg(NO₃)₂ dissociates into three ions: Mg²⁺ and two NO₃⁻ ions. NaNO₃ dissociates into two ions: Na⁺ and NO₃⁻. C₂H₄(OH)₂ does not dissociate, so it remains as one molecule.
Since the boiling-point elevation is directly proportional to the number of solute particles, Mg(NO₃)₂, with three ions per formula unit, will have the greatest boiling-point elevation. NaNO₃ has two ions per formula unit, and C₂H₄(OH)₂ has no ionization, resulting in fewer solute particles and lower boiling-point elevation compared to Mg(NO₃)₂.
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Which elements have similar behavior? barium silicon aluminum strontium osmium beryllium
Answers
Answer:
Barium, strontium and beryllium, all belong to the group 2. Silicon belong to group 14. Aluminium belong to group 13 and Osmium belong to group 8. Hence, the elements which have similar behavior are Barium, strontium and beryllium.
Explanation:
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when 0.224 g of sodium metal is added to an excess of hydrochloric acid, 2330 j of heat are produced. what is the enthalpy of the reaction as written? 2na(s) 2hcl(aq)⟶2nacl(aq) h2(g)
Answers
The enthalpy of the reaction as written is approximately 239,306 J/mol.
To calculate the enthalpy of the reaction, we need to use the heat released (2330 J) and the amount of sodium reacted (0.224 g) to determine the heat released per mole of sodium reacted.
The molar mass of sodium (Na) is 22.99 g/mol.
First, we need to calculate the number of moles of sodium reacted:
Number of moles of Na = Mass of Na / Molar mass of Na
Number of moles of Na = 0.224 g / 22.99 g/mol ≈ 0.00974 mol
Next, we can calculate the enthalpy change (ΔH) per mole of sodium reacted:
ΔH = Heat released / Number of moles of Na
ΔH = 2330 J / 0.00974 mol ≈ 239306 J/mol
Enthalpy (H) is a thermodynamic property that represents the total heat content of a system at constant pressure. It includes the internal energy of the system plus the product of pressure and volume. Enthalpy is often used to describe heat changes in chemical reactions, where the difference in enthalpy between the reactants and products determines whether a reaction is exothermic (releases heat) or endothermic (absorbs heat). Enthalpy is typically measured in joules (J) or kilojoules (kJ).
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a gas has a volume of 3.5L at STP. How many moles of gas is this?
Answers
To calculate the number of moles of gas in a volume of 3.5 L at STP, we can use the following formula:
moles = volume (in L) / molar volume (in L/mol)
moles = 3.5 L / 22.4 L/mol
moles = 0.15625 mol
Therefore, the number of moles of gas in a volume of 3.5 L at STP is approximately 0.15625 mol.
What is an ion? What are the different properties of an ion? There is more than one answer choose all that apply
Answers
Answer:
An ion is an atom or molecule that has a different number of electrons than protons, so it has a charge.
Explanation:
Trust me please
a 0.85 mol sample of a gas at 27 oc is in a rigid container with a volume of 1.65 l. what is the pressure of the gas in atm?
Answers
The pressure of the gas is 1285.6atm
Since,
T=27°C+273.15=3000.15K
n=0.85mol
V=1.65L
R=8.3144598
From ideal gas law
P= nRT/V
P=0.85×8.3144598×300.15/1.65
P=1285.6 atm
What is the ideal gas law?
The ideal gas law, also known as the general gas equation, is the equation of state for an academic ideal gas.Although the ideal gas law has some limitations, it's an approximation of numerous feasts under numerous conditions. Benoit Paul Émile Clapeyron formulated the ideal gas law in 1834 as a combination of Charles' empirical law, Boyle's law, Avogadro's law, and Gay- Lussac's law. The ideal gas law states that the product of the pressure and the volume of one gram patch of an ideal gas is equal to the product of the absolute temperature of the gas.To know more about the ideal gas law, click the link given below:
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What is the mass of 8.98 x 10^24 particles of CaCl2?
Answers
Answer:
1656.12grams
Explanation:
To calculate the mass of a substance in a particle, we need to calculate the number of moles (n).
n = nA × 6.02 × 10^23
nA = 8.98 x 10^24 particles
number of moles = 8.98 x 10^24 ÷ 6.02 × 10^23
n = 8.98/6.02 × 10^ (24 - 23)
n = 1.492 × 10^1
n = 14.92moles of CaCl2
Molar Mass of CaCl2 where Ca = 40g/mol, Cl = 35.5g/mol
CaCl2 = 40 + 35.5(2)
= 40 + 71
= 111g/mol
Using mole = mass/molar mass
mass = molar mass × mole
mass = 111 × 14.92
mass = 1656.12grams.
Which of the atoms shown has an atomic number of 4?
Answers
Answer: B
Explanation: Because it has 4 things to up down right and left