Answer: B.
Explanation:
When the electron changes levels, it decreases energy and the atom emits photons. The photon is emitted with the electron moving from a higher energy level to a lower energy level. The energy of the photon is the exact energy that is lost by the electron moving to its lower energy level.
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3.1. If the primary concern for a structure is fire resistance, one should use A. post and beam framing. B. heavy timber framing. C. platform framing.
D. balloon framing.
If the primary concern for a structure is fire resistance, one should use B.
Answer - If the primary concern for a structure is fire resistance, one should use heavy timber framing. This type of framing is made up of large, solid wood members that can withstand high temperatures and remain stable in case of a fire. that have a slower burn rate and better fire resistance compared to other framing techniques.Post and beam framing, platform framing, and balloon framing do not offer the same level of fire resistance as heavy timber framing.
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Explain how the continuous application of electricity enables the electrolysis of hydrochloric acid. What role do electrodes play in this process? What bonds, and how many, are broken and formed in the electrolysis of hydrochloric acid?
2HCl (aq) → H₂ (g) + Cl₂ (g)
PLEASE HELP!!!
It is often recommended to add a few drops of HCl to the electrolyte for better ionization and electrolysis performance even though water typically has sufficient free ions to carry out electrolysis without any problems.
Why does electricity play a part in electrolysis?By storing electrons as strong chemical bonds, electrolysis transforms electrical energy into chemical energy. When necessary, the chemical energy can be transformed back into electricity or used as a fuel.
What practical applications of active electrode electrolysis are there?One of the procedures that is frequently utilized in the metal business is electrolysis. All of these uses entail electrolysis, including the removal of metals from their ores, metal purification, and metal electroplating.
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Using a thermometer that has a bubble inside (this causes all readings to be at 2.0°C too high), Al obtained the temperature of a solution to be 45.3°C. Al then heated the solution and using the same thermometer, the thermometer is 56.7°C. Al recorded the temperature change to be 11.4°C. Is this temperature change accurate? Why or why not?
The temperature change obtained by Al is accurate
Data obtained from the questionFrom the question, we were told that the thermometer is faulty, given a reading that is 2.0 °C too high.
Al obtained a temperature change of 11.4 °C.
This value (11.4 °C.) is consider accurate because twhen we subtract 2 from both the initial and final temperature, the change in temperature obtained will still be the same. This is illustrated below:
How to determine the accurate temperature changeFaut of thermometer = 2 °C highInitial temperature (T₁) = 45.3 - 2 = 43.3 °CFinal temperature (T₂) = 56.7 - 2 = 54.7 °CChange in temperature (ΔT) = ?ΔT = T₂ - T₁
ΔT = 54.7 - 43.3
ΔT = 11.4°C
Thus, we can see that the result obtained is still 11.4°C. Therefore, the temperature change obtained by Al is accurate
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how are the electrons that are lost by the chlorophyll molecules replaced
By dividing water, the electron that was lost from the chlorophyll special pair is replaced. Protons are pumped from the stroma to the thylakoid lumen as a result of the electron passing through the first link in the electron transport chain.
The electrons from photosystem II that have traveled via the electron transport chain replace the electrons lost by these chlorophyll molecules. The two chlorophyll "a" molecules of photosystem II are compelled by light energy to go up an energy level.
The energy storage molecule ATP and the reduced electron carrier NADPH are produced by the light-dependent processes using light energy, which is required for the subsequent stage of photosynthesis. Light reactions in plants occur in the thylakoid membranes of organelles referred to as chloroplasts in chlorophyll.
The light reactions are largely controlled by photosystems, sizable complexes of proteins, and pigments (light-absorbing molecules) that are designed to capture light. Photosystem I (PSI) and Photosystem II are the two different types of photosystems (PSII). Via a process known as photolysis, the chlorophyll molecule regains the lost electron from a water molecule, releasing dioxygen (O2) in the process.
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Which of the following species has the greatest charge density?
Mg2+
Cr+
Ca²+
k
The specie that has the greatest charge density in the list is magnesium ion.
What is charge density?The term charge has to do with a specie that has a positive or a negative charge. We know that ions do have a charge and that the charge that the ion does have could be positive or negative. However, the smaller the ion, the lesser the space over which the charge can be spread.
No we can see that all of the ions that we can see in the question are all metallic ions hence we are dealing with the species that are able to form ions by the process of the loss of electrons from the atom.
Clearly, the only atom that is able to loose two electrons and maintain a very high charge density is the magnesium ion since it is a member of the second group of the periodic table.
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art 5: Limiting Reagents
1. How many moles of water can be produced from 2.5mols H₂ and 4.5mols O₂?
2H₂ + O2 → 2H₂O
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What is the limiting reagent?
What is the excess reagent?
How many moles of water can be produced from this reaction?
Answer:To determine the amount of water that can be produced from the reaction of 2.5 moles of H₂ and 4.5 moles of O₂, we first need to determine the limiting reagent. The limiting reagent is the reactant that runs out first and limits the amount of product that can be formed. In this reaction, the limiting reagent would be the reactant with the lowest stoichiometric ratio to the product, in this case, O₂.
Since 4.5 moles of O₂ is present, and the reaction requires 2 moles of O₂ for every 2 moles of H₂, only 2.5 moles of water can be produced. This means that 2.5 moles of H₂ is the limiting reagent, and the 4.5 moles of O₂ is the excess reagent.
In this reaction, 2.5 moles of water can be produced from the reaction of 2.5 moles of H₂ and 4.5 moles of O₂.
Explanation:
The equilibrium constant for the reaction
2NO(g)+Br2(g)⇌2NOBr(g)
is Kc=2.1×10−2Kc=2.1×10−2 at a certain temperature.
Calculate Kc for the following reaction:
NOBr(g)⇌NO(g)+1/2Br2(g)
Express your answer to two significant figures.
The equilibrium constant for the reaction 2NO(g)+Br₂(g)⇌2NOBr(g) is Kc=2.1×10⁻²Kc=2.1×10⁻² at a certain temperature. Then, Kc for the reaction NOBr(g) ⇌ NO(g) + 1/2Br₂(g) will be approximately 47.62.
To calculate the equilibrium constant, Kc, for the reaction:
NOBr(g) ⇌ NO(g) + 1/2Br₂(g)
We will use the relationship between the equilibrium constants of forward and reverse reactions. For the reverse reaction, which is the given reaction:
2NO(g) + Br₂(g) ⇌ 2NOBr(g)
The equilibrium constant is Kc = 2.1 × 10⁻².
Now, let's determine the equilibrium constant, Kc', for the forward reaction using the relationship:
Kc' = 1 / Kc
Kc' = 1 / (2.1 × 10⁻²)
Kc' ≈ 47.62
Therefore, the Kc will be 47.62.
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which element plays the same role on titan as water does on earth (existing as gas, liquid, and solid)?
Methane (CH₄) plays the same role on Titan as water does on Earth, existing as gas, liquid, and solid.
On Earth, water exists as a gas (water vapor), liquid (water), and solid (ice) due to the planet's temperature and atmospheric pressure conditions. On Titan, the largest moon of Saturn, the role of water is replaced by methane. Methane exists as a gas in Titan's atmosphere, and due to the extremely low temperatures and high atmospheric pressure, it can also exist as a liquid and solid on the moon's surface.
Titan's atmosphere is primarily composed of nitrogen, with small amounts of methane, ethane, and other gases. The presence of methane and other hydrocarbons on Titan has led scientists to speculate about the possibility of life on the moon, although this has yet to be confirmed.
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106. the radius of a neon atom is 69 pm, and its mass is 3.35 x 10^-23 g. what is the density of the atom in grams per cubic centimeter (g/cm^3)? assume the nucleus is a sphere with volume = 4/3πr^3.
The density of the atom in grams per cubic centimeter (g/cm³ is 24.28 g/cm³
What is density?The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as
Density = mass / volume
With the above formula, we can de terminate density of the atom. Detail below:
How to determine the volume of the atomWe'll begin by calculatingg thge v plume of the atom. This is illustrated below:
Radius (r) = 69 pm = 69×10⁻¹⁰ cmPi (π) = 3.14Volume (V) = ?V = 4/3πr³
V = 4/3 × 3.14 × (69×10⁻¹⁰)³
Volume of atom = 1.38×10⁻²⁴ cm³
How to determine the density of the atomThe density of the atom can be o brained as follow:
Mass of atom = 3.35×10⁻²³ gVolume of atom = 1.38×10⁻²⁴ cm³Density of atom =?Density = mass / volume
Density of atom = 3.35×10⁻²³ / 1.38×10⁻²⁴
Density of atom = 24.28 g/cm³
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based on the data table, which unknown solution could be 0.1 m naoh
Answer:
Where is the data table?
what should be used to clean powder fouling, corrosion, and dirt from outside parts of lower reciever and extensiion assembly
To clean powder fouling, corrosion, and dirt from outside parts of the lower receiver and extension assembly, one should use the best quality cleaning materials and methods.
Powder fouling, corrosion, and dirt can accumulate on the outside parts of the lower receiver and extension assembly, making it hard to maintain the rifle. It is essential to clean the weapon regularly to maintain its efficiency and longevity.
The following cleaning materials are required for the cleaning process:
Cleaning solvent
Cleaning brush
Microfiber cloth
Lubricant
The best solvent to use when cleaning the rifle is a powder solvent. This is because it is specifically designed to remove fouling from firearms. It is also essential to use a cleaning brush made of brass, nylon, or synthetic material to avoid damaging the parts of the lower receiver and extension assembly.
Brass brushes are best for removing fouling, while nylon and synthetic brushes are gentle on the metal parts and help prevent corrosion. Avoid using a steel brush when cleaning the rifle since it may scratch or damage the surface of the metal.Lubricant is also essential in maintaining the rifle. It helps keep the moving parts smooth and minimizes friction between metal parts.
A high-quality lubricant should be used, and the excess should be wiped off with a microfiber cloth. To clean the weapon, apply the cleaning solvent onto the brush and scrub the outside parts of the lower receiver and extension assembly, then wipe it off with a microfiber cloth. Ensure the surface of the metal parts is dry before applying lubricant. Apply lubricant to moving parts of the weapon.
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What is the reactive intermediate in the reaction of 1,3-diene with hbr, resulting in 1,4-addition?
Allylic carbocation is the reactive intermediate in the reaction of 1,3-diene with hbr, resulting in 1,4-addition.
Are allylic carbocations more stable than tertiary?While stabilized primary resonance carbocations are less stable than tertiary carbocations( allyl cation, benzyl cation, and methoxymethyl cation), stabilized secondary resonance carbocations are more stable than tertiary carbocations.What's the structure of allylic?An allyl group is a substituent with the structural formula H2C = CH − CH2R, where R is the rest of the patch. It consists of a methylene ground( − CH2 −) attached to a vinyl group( − CH = CH2). The name is deduced from the Latin word for garlic, Allium sativum.Learn more about Allylic carbocation here:
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4. Which elements have a completely full outermost energy level?
Answer:
Helium (He), neon (Ne), and argon (Ar), as group 18 elements, have outer electron shells that are full or satisfy the octet rule. This makes them highly stable as single atoms. Because of their non-reactivity, they are called the inert gases or noble gases.
Explanation:
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Which change will increase the production of water vapor in this reaction :
2HâS + 3Oâ â2HâO + 2SOâ
a. adding SOâ
b. removing HâS
c. removing Oâ
d. Removing SOâ
Adding SO\(_2\) will increase the production of water vapor in this reaction 2H\(_2\)S + SO\(_2\) → 3S + 2H\(_2\)O.
The gaseous phase with water is known as water vapour, water vapour, or aqueous vapour. Within the hydrosphere, it is one type of water state. Water vapour can be created by the boiling or evaporation of liquid water as well as by the melting of ice. Like the majority of other atmospheric elements, water vapour is transparent. Adding SO\(_2\) will increase the production of water vapor in this reaction 2H\(_2\)S + SO\(_2\) → 3S + 2H\(_2\)O.
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The half-life of a strontium isotope is 25 years. How much of this particular isotope will remain after 100 years if the starting mass is 16 grams?
Answer:
1 gram
Explanation:
Half life = 25 years
Starting mass = 16 grams
Time = 100 years
Number of half lives = Time / Duration of Half life = 100 / 25 = 4
After first Half life;
Remaining mass = 16 / 2 = 8 g
After Second Half life;
Remaining mass = 8 / 2 = 4 g
After Third Half life;
Remaining mass = 4 / 2 = 2 g
After Fourth Half life;
Remaining mass = 2 / 2 = 1 g
If the ph of a solution is 6.1 what is the concentration of h+ ions in the solution
Answer:
\(10^{-6} \frac{mol}{L}\)
Explanation:
Comparing to the solution consisting a pH of 5 containing \(10^{-5}\) \(\frac{mol}{L}\) of hydrogen ions, a solution having a pH of 6 consists of \(10^{-6} \frac{mol}{L}\) of hydrogen ions. A solution having a pH of 7 too will have a pH of \(10^{-7} \frac{mol}{L}\).
The h ions produced by an acid in aqueous solution associate strongly with h2o to form the _____ ion, which has the formula _____.
The H ions produced by an acid in aqueous solution associate strongly with H₂O to form the Hydronium ion, which has the formula H₃O⁺.
Hydronium ion are formed when acid in introduced in an aqueous solution. It has the formula as H₃O⁺ formed from H₂O.
When Hydrogen ions associate with the water molecules formed from the acid solution, it forms Hydronium ions upon protonation.
Water molecule changes to Hydronium ions by accepting a proton.
Hydronium ions often used synonymously with Hydrogen ions.
Hydronium ions acts as an acid or base depending upon the Bronsted-Lowry concept.
Hydronium ions is a common name to the cation which is aqueous in nature.
It plays an important role while dealing with reactions that have a chemical nature occuring in aqueous solutions.
Hydronium ions is an important weathering agent.
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Using pesticides has what negative effect?
Increases crop yields.
Causes a resistance of bugs/pests to future pesticide use.
Makes groundwater clearer.
Gives birds more insects to eat.
Given the two half-cell reactions for copper and iron below
2
2
standard
electrode potential (V)
2 -0.41
Cu Cu 2 +0.34
Fe Fe e
e
+ −
+ −
→ +
→ +
Would you use a water pipe that consists of the two metals? Justify your answer!
Answer:
No, i will not use a water pipe consisting of the two metals
Explanation:
Looking at the reduction potential of the both metals, it is clear that an electrochemical cell is set up with iron as the anode and copper as the cathode.
This will make the iron to quickly corrode and eventually destroy the water pipe. It is better to have a set up in which another metal that is higher than iron in the electrochemical series is combined with it.
what is changed in a chemical equation to balance it
The coefficients of the reactants and products can be changed in a chemical equation to balance it.
In a chemical equation, we write the reactants on the left side and the products on the right side. Coefficients are the numbers that appear in front of each substance in the chemical equation. They indicate the number of molecules or formula units of each substance involved in the reaction. To balance a chemical equation, we must ensure that the same number of atoms of each element is present on both the reactant and product sides.
To achieve this, we can adjust the coefficients of the reactants and products. This means that we can change the number of molecules or formula units of each substance in the equation. The chemical equation is balanced when the number of atoms of each element is equal on both sides. Balancing chemical equations is important because it helps us to predict the products of a reaction and determine the amount of reactants needed.
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What are comets made of?
A. Dust, sand, and hydrogen
B. Rock, metal, and liquid water
C. Dust, metal, and helium
D. Rock, dust, and ice
SUBMIT
Answer:
C. Rock, dust, and ice.
Explanation:
Comets are frozen leftovers from the formation of the solar system composed of dust, rock, and ices.
how can one establish whether a liquid sample extracted from a plant is pure
In a garden, an ant walked past an earthworm that was moving at 7.2 millimeters per second. When it passed the worm, the ant had walked 458millimeters directly toward a plant at a constant velocity. It took the ant 10.0seconds to walk that distance. What was the ant's velocity?
Answer:
45.8 millimeters per second.
Explanation:
To find the ant's velocity, we need to first find the distance it traveled and the time it took to travel that distance.
The distance the ant traveled is 458 millimeters, and the time it took to travel that distance is 10.0 seconds.
To find the ant's velocity, we divide the distance it traveled by the time it took to travel that distance.
This gives us a velocity of 458 millimeters / 10.0 seconds = 45.8 millimeters per second.
28
Aisha was preparing two cupcakes with the same
mass and volume in the same oven. In order to
determine the specific heat of the cupcakes, Aisha
measured the temperature of each one at four
different times. The graph below shows the changes
in temperature with time.
Answer:
Explanation:
I am sorry but the graph is not given
Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices.
1. Some ionic compounds that contain metal ions may have names that contain Roman numerals.
2. lonic compounds tend to have high melting points and tend to be good conductors of electricity when in the molten state.
3. Three ions are present in one formula unit of a compound that contains Nat and O2 ions.
Only one of the statements is true.
Two of the three statements are true.
All three statements are true.
None of the statements are true.
The following are the given statements:1. Some ionic compounds that contain metal ions may have names that contain Roman numerals.2. Ionic compounds tend to have high melting points and tend to be good conductors of electricity when in the molten state.3.
Three ions are present in one formula unit of a compound that contains Nat and O2 ions. To answer this question, we need to assess whether the statements are true or false.1. TRUE2. TRUE3. FALSE
Statement 1 is true because some ionic compounds containing metal ions may have names that contain Roman numerals. This is typically the case when the metal ion has more than one possible charge. Statement 2 is also true because ionic compounds, in general, have high melting points and are good conductors of electricity when molten, meaning they have a high melting point and an electrical conductivity that increases when they are melted or dissolved in water. This is because the charged ions are free to move and carry electrical charges. Statement 3 is incorrect because Nat and O2 do not exist as ions. As a result, the statement is false.
Therefore, two of the three statements are true, and the correct answer is: Two of the three statements are true.
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what do you believe is more important for society to look at when determining what substance is more environmentally-friendly?
When determining what substance is more environmentally-friendly, it's important for society to look at both the substance's overall environmental impact and its sustainability.
The overall environmental impact of a substance includes its potential to contribute to climate change, pollution, and depletion of natural resources. This can be evaluated by examining the substance's production process, transportation, use, and disposal.
Sustainability, on the other hand, refers to the ability of a substance to meet the needs of the present generation without compromising the ability of future generations to meet their own needs. Sustainable substances are those that can be produced and used in a way that does not exhaust or degrade natural resources, or cause significant harm to the environment.
In evaluating the environmental-friendliness of a substance, it's important to consider both its immediate impact on the environment and its long-term sustainability. A substance may be environmentally-friendly in the short term, but if it's not sustainable, it may cause more harm than good in the long run. Therefore, a comprehensive approach that considers both environmental impact and sustainability is necessary to determine what substance is more environmentally-friendly.
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Which gland of the endocrine system is located near the brain?
Answer:
The pituitary gland is located below the brain. :)
On average, a middle school girl should eat between 1,600 and 2,00 calories each day. If your lunch each day was 400 calories, do your total calories fall between 1,600 and 2,00 calories everyday? Why do you think they did/did not? Explain your answer.
Answer:
no I'm about to say we will be didn't 1,600 we will 500
a neutralization reaction between an acid and a metal hydroxide produces view available hint(s) for part aa. sodium hydroxide. b. water and a salt. c. oxygen gas d. hydrogen gas
A neutralization reaction between an acid and a metal hydroxide typically produces water and a salt. So, the answer to your question is b.
The formation of hydrogen gas or oxygen gas is not a common outcome of neutralization reactions, and sodium hydroxide is not a product of neutralization between an acid and a metal hydroxide.
The products of a neutralization reaction between an acid and a metal hydroxide. A neutralization reaction between an acid and a metal hydroxide produces water and a salt (Option b). This is because the hydrogen ion (H+) from the acid reacts with the hydroxide ion (OH-) from the metal hydroxide to form water (H2O), while the remaining cation from the metal hydroxide and the anion from the acid combine to form a salt.
Therefore, option b is the most appropriate answer to your question. It is essential to note that the type of salt produced depends on the acid and the metal hydroxide used in the reaction.
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Which object is an insulator?
A. Iron
B. Copper
C. Plastic
D. Salt water
Answer:
c. plastic is an insulator
Explanation:
a and b are metals which are conductors and d contains water which is also a conductor