Answers
What causes an electron in an atom to move to a higher energy level it that it absorbs a specific amount of light energy. C
Excited state of an atomAn atom is in its excited state when it moves from a lower energy level to a higher energy level by absorbing a specific amount of light energy.
If an atom is in a lower energy state, it is said to be in its ground state.
Thus, what causes an electron in an atom to move to a higher energy level it that it absorbs a specific amount of light energy
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Related Questions
Name two indicators used in quantitative analysis.
Answers
1. Standard deviation: It measures the variation or volatility of the data points in a dataset. It is calculated by taking the square root of the variance. The higher the standard deviation, the more dispersed the data points are from the average. In finance, standard deviation is often used to measure the risk associated with investments. Higher standard deviation indicates higher risk.
2. Correlation coefficient: It measures the strength of the relationship between two variables. It is calculated by dividing the covariance between the two variables by the product of their standard deviations. Correlation coefficient can range from -1 to 1, where -1 indicates a perfect negative correlation, 0 indicates no correlation, and 1 indicates a perfect positive correlation. Correlation coefficient is often used in finance to assess the relationship between two stocks or other financial instruments. A higher correlation coefficient indicates a stronger relationship between the variables being compared.
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If 4.44 mol of C,H₁2 reacts with excess O₂, how many moles of CO₂ will be produced by the following combustion reaction?
C₂H2 +80₂6H₂O +5C0₂
moles of CO₂:
mol
Answers
A combustion reaction is a type of chemical reaction that involves the rapid combination of fuel (typically a hydrocarbon) with oxygen, resulting in the release of energy in the form of heat and light.
Combustion reactions are often characterized by the presence of a flame and the production of carbon dioxide (CO₂) and water (H₂O) as products.
In the given balanced combustion reaction:
C₂H₂ + 5O₂ → 4H₂O + 2CO₂
The stoichiometric ratio indicates that 1 mole of C₂H₂ reacts with 2 moles of CO₂ produced. Therefore, if 4.44 moles of C₂H₂ react, we can calculate the moles of CO₂ produced using the ratio:
Moles of CO₂ = (4.44 mol C₂H₂) × (2 mol CO₂ / 1 mol C₂H₂)
Moles of CO₂ = 8.88 mol
Therefore, 8.88 moles of CO₂ will be produced in the combustion reaction.
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How does an increace in reactant concentration affec the rate of reaction
Answers
Answer:
the reaction rate increases
Explanation:
An increase in reactant concentration generally provides more opportunities for reactants to get together and complete the reaction. The rate of reaction can generally be expected to increase.
__
However, if the reactant whose concentration is being increased is not a rate-limiting reactant, the increased concentration may have no effect. The same will be true if the reaction rate is limited by a catalyst.
the outer most shell of an atom is called the valane shell. the number of electrons in this shell determines ________.
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If the components of a solution are in the same state, which one is the solvent?
Answers
Answer:
Usually, the substance present in the greatest amount is considered the solvent.
write anode and cathode in Zn-Ag galvanic cell
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Explanation:
Zinc is the anode (solid zinc is oxidised). Silver is the cathode (silver ions are reduced).
By convention in standard cell notation, the anode is written on the left and the cathode is written on the right. So, in this cell: Zinc is the anode (solid zinc is oxidised). Silver is the cathode (silver ions are reduced).
PLS HELP ASAP I NEED NUMBER 8
Answers
Explanation:
determine the genotypes of the parent organisms.
write down your "cross" (mating)
draw a p-square.
4. " ...
determine the possible genotypes of the offspring by filling in the p-square.
summarize results (genotypes & phenotypes of offspring)
among the following which is the most stable?
a.Co2 b.C2 c.O2 d.No
Answers
NO is the most stable among the given compound. Thus, the most appropriate answer comes out to be option D.
The bond order is the number of bonds between two atoms. The higher the bond order the higher the stability of the compound.
It is calculated by (number of bonding electrons - Number of the anti-bonding electron) * 0.5
So, for C\(O_2\) the bond order is 2
For \(C_2\) ,
The number of electrons in the bonding orbital = 8.
Number of electrons in anti-bonding orbital = 4.
Bond order = (8- 4) * 0.5 = 2.
For \(O_2\) ,
The number of electrons in the bonding orbital = 10.
Number of electrons in anti-bonding orbital = 6.
Bond order = (10 - 6) * 0.5 = 2.
For NO,
The number of electrons in the bonding orbital = 10.
Number of electrons in anti-bonding orbital = 5.
Bond order = (10 - 5) * 0.5 = 2.5
Thus, the most stable compound is NO as it has a 2.5 bond order.
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Name four types of physical weathering. How are they similar?
for 13 points
Answers
The four types of physical weathering are:
1.) Frost action or freeze-thaw weathering
2.) Exfoliation or unloading
3.) Thermal expansion and contraction
4.) Abrasion
These types of weathering are similar in that they all involve physical processes that break down rocks and other geological materials without the involvement of chemical reactions.
Frost action occurs when water seeps into cracks in rocks and freezes, causing the water to expand and exert pressure on the surrounding rock. This process repeats over time and can cause the rock to fracture and break apart.
Exfoliation occurs when rocks that were once buried deep beneath the earth's surface are exposed to lower pressures as overlying rocks erode away. As the pressure decreases, the rocks expand and crack, causing outer layers of rock to peel away like layers of an onion.
Thermal expansion and contraction occurs when rocks are repeatedly subjected to heating and cooling cycles. This can cause the rock to expand and contract, leading to the development of cracks and fractures.
Abrasion occurs when rocks and other geological materials are subjected to repeated rubbing or grinding by other materials, such as wind-blown sand, water, or other rocks. This process can cause rocks to wear down and break apart over time.
In summary, these four types of physical weathering are similar in that they all involve physical processes that break down rocks and other geological materials, but each type operates under different conditions and results in different forms of weathering.
Answer:
below
Explanation:
The four types of physical weathering are:
1. Freeze-thaw weathering
2. Exfoliation
3. Abrasion
4. Thermal expansion and contraction
These types of physical weathering are similar in that they all involve the breakdown of rocks and other geological features due to physical forces rather than chemical reactions. In each case, the physical stress causes the rock to crack or break apart. Additionally, they all can occur in various types of climates and environmental conditions.
Why KHPo4 ignore effective as a buffer but kh2po4 is not
Answers
KH2PO4 is a more suitable choice as a buffer because it has a greater buffering capacity due to the presence of the weak acid and its conjugate base.
KHPo4 is not considered an effective buffer compared to KH2PO4 due to its limited buffering capacity. The effectiveness of a buffer is determined by the concentration and dissociation properties of its conjugate acid-base pair.
KH2PO4 is a salt composed of the weak acid H2PO4- and its conjugate base HPO4^2-. In an aqueous solution, KH2PO4 can dissociate to release H+ ions from the H2PO4- component, which acts as a weak acid, and the HPO4^2- component can accept H+ ions, acting as a weak base. This allows KH2PO4 to effectively resist changes in pH when small amounts of acid or base are added to the solution.
On the other hand, KHPo4 consists of the strong acid H3PO4 and the weak base HPO4^2-. H3PO4 fully dissociates in water, providing a large concentration of H+ ions, making it difficult for the HPO4^2- to effectively act as a base and maintain pH stability.
Therefore, KH2PO4 is a more suitable choice as a buffer because it has a greater buffering capacity due to the presence of the weak acid and its conjugate base.
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what is atom?????????????
Answers
Answer:
An atom is a particle of matter that uniquely defines achemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons. ... The nucleus is positively charged, and contains one or more relatively heavy particles known as protons and neutrons. A proton is positively charged.
Answer:
An atom is a particle of matter that uniquely defines achemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons. ... The nucleus is positively charged, and contains one or more relatively heavy particles known as protons and neutrons. A proton is positively charged.
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A certain reaction is endothermic in the forward direction and has a greater number of molecules on the product side. Which set of conditions should be used to maximize the yield of the products? (5 points)
Group of answer choices
Decrease the temperature and decrease the pressure.
Increase the temperature and decrease the pressure.
Decrease the temperature and increase the pressure.
Increase the temperature and increase the pressure.
Answers
Answer:Decrease the temperature and increase the pressure
Question 4 of 10
Based on information from the periodic table, what does this image
represent?
= 9 Protons
= 10 Neutrons
= 10 Electrons
A.Neutral fluorine
B. A positively charged fluoride ion
C. A negatively charged fluoride ion
D. A neutral neon atom
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So we can cross out D.
Next, we can figure out a charge of an ion by looking at protons and electrons. Neutrons doesn’t matter since they’re neutral and only contribute to the mass. Protons and positive and electrons are negative. It’s like doing kindergarten math. John has 9 apples and he eats 10 (I know it’s not possible), how many apples does he have left? The answer is -1. The number of electrons are greater than the number of protons, so the ion is negative.
The answer is therefore C. A negatively charged fluoride ion.
How are radiation levels kept in balance?
Outgoing
Earth emits
Back toward the sun in the form of
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Answer:
Explanation:We known that Earths energy machine is driven by sunlight which acts as fuel for this machine and to strike a balance between outgoing long wave radiation and short wave radiation there are many factors which are involved in this process.Sun emits this energy in the form of short wave radiation because of the huge energy it has and short wave radiation are higher in energy.Hence, they reach the earth surface mostly as visible and UV rays.After reaching the earths surface what happens with these rays is that they get absorbed by the clouds and other constituents of Earth.
Now, this energy needs to be emitted back in to space in order to balance out the energy budget of earth and that is why this energy is emitted back as long wave radiation which have less energy and also earth has less energy unlike the sun.Loss of this energy is essential as Earth looses most of its energy through this and results in cooling.But when this OLR decreases it should be a cause of concern for us.
This imbalance is caused by a wide range of different human induced activities which has a cumulative effect on the temperature of earth.These activities gives rise to a huge gain in the CO2 concentration which is why this word has gain so much popularity and a cause of widespread concern for us.At community level we contribute to this heating by increasing usage of personal automobiles rather than going for public transport , advancement in technology has greatly changed our lifestyles making it more simpler and easier but this demands more energy consumption.Landscape changes are one of the most important because its taking place at a faster rate.Most of the land being cleared off to built new houses which means clearing off the existing vegetation which leads to temperature rise.Setting up of Industry depending on its type can reduce the amount of OLR escaping the surface by introducing more amount of GHGs in to the atmosphere.
Its these small communities which add up to become the entire human population causing a massive damage and hence at community level if people realize and take necessary steps things will start to change.
0.40 L of HNO3 is titrated to equivalence using 0.20 L of 0.2 MNaOH . What is the concentration of the HNO3
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A- Label the reactions as weak acid dissociation , strong acid, weak base, strong base dissociation, or neutralization.B- Circle the acid, base, or salt on the products side and label it as such.
Answers
To label the reactions, it is important to remember that in:
- Weak acid dissociation the acid partially dissociates.
- Strong acid dissociation the acid fully dissociates.
- Weak base dissociation the base partially dissociates.
- Strong base dissociation the base fully dissociates.
- Neutralization an acid and a base react to form a salt.
1. a: Strong acid dissociation, b: Cl- is the weak conjugate base.
2. a: Weak acid dissociation, b: CH3COO- is the strong conjugate base.
3. a: Strong base dissociation, b: Na+ is the weak conjugate acid.
4. a: Weak base dissociation, b: Na4+ is the strong conjugate acid.
5. a: Neutralization, b: NaNO3 is the salt.
what will the kid have hair or no hair the mom has no hair also has two lowercase h the dad has hair also have two capital h the picture is the punnett square
Answers
Answer:
All of the children will have hair.
Explanation:
Since the Father has Dominant genes, for having hair, and the mother having recessive genes, for not having hair, the Dominant genes override the recessive, making the children have hair.
The pOH of a solution is 6.0. Which statement is correct?
Use pOH = -log[OH-] and PH+pOH = 14.
The pH of the solution is 20.0.
O The concentration of OH ions is 1.0 x 108 M.
The concentration of OH ions is 1.0 x 106 M.
O The pH of the solution is 8.0.
A
Answers
At pOH value of 6.0 the pH value of the following solution is 8.0 and the concentration of [\(H^{+}\) ] ion is \(10^{-8}\)
In this question we will apply the formula
pH +pOH = 14 . . . . . . . . . . . . .(1)
where pH = concentration of [\(H^{+}\) ] ion
pOH = concentration of [\(OH^{-}\) ] ion
As per the question
pOH =6.0
Putting the value of pOH in equation (1) we get the value of pH
pH + 6.0 =14
pH = 14 -6.0
pH = 8.0
The value of pH if the pOH value is 6.0 is 8.0
To find the concentration of \(H^{+}\) ion we will use the following formula
This is calculated by the formula
[\(H^{+}\)} = \(10^{-pH}\)
where we will write the values of pH
Hence the concentration of [\(H^{+}\)} ion is \(10^{-8}\)
Therefore at pOH of 6.0 the pH value of the following solution is 8.0 and the concentration of [\(H^{+}\) ] ion is \(10^{-8}\)
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The complete question is -
What is the pH value and concentration of [\(H^{+}\) ] ion of the following if the pOH value of the solution is 6.0 ?
give the correct valence for ions of the following elements. drag the appropriate labels to their respective targets.
Answers
The correct valence for ions of the following elements are:
Ca: 2+
Cl: 1-
O: 2-
Al: 3+
K: 1+
What is valence?
In chemistry, valence refers to the combining power of an element, which is determined by the number of electrons an atom can lose, gain, or share to form chemical bonds with other atoms. The valence of an element can be used to predict its chemical behavior, including the types of compounds it can form and the way it interacts with other elements.The valence of an element is often represented by a number, which indicates the number of electrons an atom of that element can gain, lose, or share when it reacts with other atoms. For example, the valence of sodium is +1, because it has one electron in its outermost shell that it can lose to form a positively charged ion. The valence of chlorine is -1, because it has one vacancy in its outermost shell that it can fill by gaining an electron from another atom.To know more about valence, click the link given below:
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1. (1pt for each) Mark O if the statement is true, X if wrong. For the wrong statements, correct
them.
(a) Since electrons are required, all electrochemical depositions are electrolytic. ()
(b) Increasing metal ion concentration has the same effect with the decreasing deposition current density on the electrodeposited structures. ( )
(c) The standard reaction Gibbs energy change for water electrolysis is positive, thus
generates 1.23V during electrolysis. ( )
(d) When the system is under charge transport limitation, the electrodeposited structures
are normally dense and uniform. ( )
(e) If you deposit metal A on metal 8 with huge lattice misfit between them, the deposition
process follows layer by-layer growth mechanism. ( )
(f) If the standard reduction potentials of metal A and B are 1.0V and -1.0V with respect to hydrogen electrode, you need to apply potential negative than -1.0V for making AxBy alloy. ( )
(g) When you make metal nanowire using AAO templated electrodeposition, the length of
wire can be controlled by the acid strength and voltage in anodization step. ( )
(h) The membrane electrolyte for PEMFC should be paths for both electronic and ionic movements. ( )
(i) The fuel cell electric vehicle generates no CO2, during operation. ( )
(j) The organic leveler used in the electrodeposition process interact with the substrate or
growing deposits normally through van der Waals interaction. ()
Answers
(a) Electroless deposition is a type of electrochemical deposition that does not require electrons - X.
(b) Increasing metal ion concentration increases the deposition current density on the electrodeposited structures - X.
(c) The standard reaction Gibbs energy change for water electrolysis is negative, not positive, and generates 1.23V during electrolysis under standard conditions - X.
(d) When the system is under mass transport limitation, the electrodeposited structures are normally dense and uniform - O.
(e) If you deposit metal A on metal B with a huge lattice misfit between them, the deposition process follows the island growth mechanism rather than the layer-by-layer growth mechanism - O.
(f) To make an AxBy alloy from metals A and B with standard reduction potentials of 1.0V and -1.0V, respectively, you need to apply a potential between -1.0V and 1.0V, depending on the desired stoichiometry - O.
(g) The length of metal nanowires made using AAO templated electrodeposition can be controlled by the anodization time and the thickness of the AAO template - O.
(h) The membrane electrolyte for PEMFC should only allow for ionic movement, not electronic movement - O.
(i) The fuel cell electric vehicle generates less CO2 than traditional vehicles but still produces some CO2 during operation - O.
(j) The organic leveler used in the electrodeposition process interacts with the substrate or growing deposits through chemical bonding rather than van der Waals interaction - O.
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____ is the struggle between organisms for food, water, and other needs.
What is it because it says I need to type something please tell me
Answers
Answer:
Competition
Explanation:
Competition, is preys, and predators fighting for survival. Whether it be on the african dessert, lions fighting hyenas over territory, or water.
The molecule β-carotene has λ 450 nm, and ɛ = 15,000 m2 mol-1. Calculate the absorption (A) expected for a solution in which 0.1 mg has been dissolved in 10 ml of water (given: the molecular weight of β-carotene, C40H56, as 536) with a path length of 1 cm. Group of answer choices
Answers
Answer: The absorbance for a solution is 0.0028
Explanation:
To calculate the absorption of a solution, the equation by Beer-Lambert law is used:
\(A=\varepsilon \times b\times C\)
OR
\(A=\varepsilon \times b\times \frac{\text{Given mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (mL)}}\)
where,
A = absorbance = ?
\(\varepsilon\) = molar absorptivity = \)15000m^2mol^{-1}L\)
b = path length = 1 cm = 0.01 m (Conversion factor: 1 m = 100 cm)
Given mass of \(\beta-\) carotene = 0.1 mg = 0.0001 g (Conversion factor: 1 g = 1000 mg)
Molar mass of \(\beta-\) carotene = 536 g/mol
Volume of solution = 10 mL
Putting values in equation 1:
\(A=15000\times 0.01\times \frac{0.0001\times 1000}{536\times 10}\\\\A=0.0028\)
Hence, the absorbance for a solution is 0.0028
What practices from the article can members of the public or governmental agencies adopt as they look to improve water quality? Back up your answer with evidence from the article above.
Answers
The evidence from the article highlights these practices as effective means of improving water quality. By implementing these measures, both individuals and governmental agencies can contribute to the preservation and protection of water resources.
According to the article, there are several practices that members of the public and governmental agencies can adopt to improve water quality:
Implementing proper wastewater management: This involves treating wastewater before it is released back into the environment. The article emphasizes the importance of implementing advanced treatment technologies to remove pollutants effectively.Promoting sustainable agriculture: The article highlights the significance of adopting practices that minimize the use of fertilizers and pesticides, such as precision agriculture techniques. These practices can reduce the runoff of agricultural chemicals into water bodies.Establishing buffer zones: Creating vegetated buffer zones along rivers, lakes, and streams can help filter and absorb pollutants, preventing them from entering the water bodies. The article suggests that buffer zones should be implemented to reduce sediment, nutrient, and pesticide runoff from adjacent fields.Encouraging responsible industrial practices: The article emphasizes the need for industries to adopt eco-friendly practices, including proper disposal of industrial waste and the use of environmentally friendly production techniques.
Raising awareness and education: Public education campaigns can play a crucial role in improving water quality. The article suggests that educating the public about the impact of their actions on water bodies and providing information on sustainable practices can lead to positive changes.
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Hydrogen bonds within liquid water are attractions between protons and hydroxide ions. are dipole-dipole attractions. are ion-induced dipole attractions. are attractions between protons and oxygen nuclei. are attractions between two hydrogen atoms.
Answers
Answer:
true because the bonds cannot be broken down
3. If an element has 47 protons and 54 neutrons what is the element and what is its atomic
mass?
4. If one atom has 47 neutrons and a mass of 87 and another one has 41 protons and a
mass of 87, are they isotopes of each other?
5. Draw the electron dot diagram for the element Phosphorous.
Answers
4.Nb(Niobium) the atomic mass is 92.906
5.
Aqueous sodium phosphate and aqueous iron (III) chloride react to produce aqueous sodium chloride and solid iron (III) phosphate.
Answers
Answer:
this one is hard
Explanation:
but it's iron because the sodium so yea there u go.
what is the largest recognized landmasses?
Answers
Answer:
The continents are, from largest to smallest: Asia, Africa, North America, South America, Antarctica, Europe, and Australia.
Explanation:
There ya go Hope this helped
please help with this!
Answers
Answer:
d) The object falls towards the ground
Explanation:
Write a half equation for each of the following.
a) The process at the positive electrode in the electrolysis of molten
calcium oxide.
b) The process at the negative electrode in the electrolysis of molten
potassium bromide.
Answers
Answer: Write a half equation for each of the following.
a) The process at the positive electrode in the electrolysis of molten
calcium oxide.
b) The process at the negative electrode in the electrolysis of molten
potassium bromide.
Explanation: a) The process at the positive electrode in the electrolysis of molten
calcium oxide.
100 Points! Chemistry question. Photo attached. Please show as much work as possible. Thank you!
Answers
Explanation:
The correct formula for calcium fluoride is CaF2 (with two fluoride ions per calcium ion). Therefore, 2.25 moles of CaF2 contains:
- 2.25 moles of Ca2+ ions (since there is one calcium ion for every molecule of CaF2)
- 2 x 2.25 = 4.50 moles of F- ions (since there are two fluoride ions for every molecule of CaF2)
So, in total, 2.25 moles of CaF2 contains 2.25 moles of Ca2+ ions and 4.50 moles of F- ions.