Answer:
The balanced equation is 5Fe2++MnO-4+8H+→5Fe3++Mn2++4H2O .
Explanation:
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Answer:
5Fe2++MnO-4+8H+→5Fe3++Mn2++4H2O .
Explanation:
the weak ionization constant (Ka) for HNO2 is equal to:
Answer:
the answer is A
Explanation:
The weak ionization constant (Ka) for HNO₂ is:
[tex]\displaystyle K_a = \frac{[H^+][NO_2^-]}{HNO_2}[/tex]
What is the ionization constant?Acid-ionization constant Ka can be described as a quantitative measure of the strength of an acid in solution. It can be represented as the equilibrium constant for a chemical reaction:
[tex]{\displaystyle {\ce {HA \longrightarrow A^- + H^+}}}[/tex]
The chemical species HA can dissociate into A⁻ the conjugate base of the acid and a hydrogen ion, H⁺. In equilibrium, when the concentrations will not change over time, because both forward and backward reactions have the same rate.
The ionization constant can be described as the ratio of products and reactants raised to stoichiometric powers.
The dissociation constant is defined as:
[tex]{\displaystyle K_{\text{a}}=\mathrm {\frac {[A^{-}][H^{+}]}{[HA]}} }[/tex]
Given the dissociation of the HNO₂ as follows:
HNO₂ ⇄ H⁺ + NO₂⁻
The weak ionization constant (Ka) for HNO₂ is equal to:
[tex]\displaystyle K_a = \frac{[H^+][NO_2^-]}{[HNO_2]}[/tex]
Therefore, option A is correct.
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To answer this question, you may need access to the periodic table of elements.
Which of these pairs of atoms would experience a pure covalent bond?
a.) C and O
b.) Br and Br
c.) H and Cl
d.) Na and Cl
Answer:
b.) Br and Br
Explanation:
A covalent bond occurs when electrons are shared between two atoms causing them to form a bond.
A "pure" covalent bond refers to a nonpolar covalent bond. In these bonds, the electrons are shared equally between two atoms as a result of the absence of an (or very small) electronegativity difference. The purest covalent bond would therefore be between two atoms of the same electronegativity. Two bromines (Br) have the same electronegativity, thus making it the purest covalent bond.
Polar covalent bonds occur when electrons are shared unequally between two atoms. There is a larger electronegativity difference between the two atoms, but not large enough to classify the bonds as ionic. In this case, a.) and c.) are polar covalent bonds and d.) is an ionic bond.
Need the answer pretttty pleaseeeeee
Answer:
The answer would be D.
Explanation:
Whenever one has many of the same correlating numbers within in a pattern, the rest tend to follow. With the information I was given and not the actual plotting, that would be my answer.
[05.01] How does the kinetic energy of a substance's particles in the solid phase compare to their kinetic energy in the liquid phase
Answer:
liquids have more kinetic energy than solids
Explanation:
water and ice are good examples
hotter the faster
kinetic can mean speed
solids held together by strong intermolecular forces of attraction
very little or no kinetic energy between the particles
solids are rigid and have definite shape and volume
liquid particles are held by weaker Vander Waal forces.
particles collide with each other and gain kinetic energy.
liquids have more kinetic energy than in the solid phase.
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perform the following operation and express the answer in scientific notation 6x10^2 / 8x10^12
Answer:
7.5 x 10 ^-11
Explanation:
6/8 = .75
10^2 / 10^12 = 10^ (2-12) = 10^(-10)
so far .75 x 10^-10
which is 7.5 x 10^-11
Write the features of modern periodic table?
The long form of periodic table consist of vertical columns called groups and horizontal rows called periods.
Elements are arranged in the increasing order of atomic numbers.
Elements in the modern periodic table are arranged in 7 periods and 18 groups.
Horizontal rows are called periods and vertical columns are called groups.
Elements are placed in periods based on the number of shells in their atoms.
The shortest period is the first period which contains only two elements – Hydrogen and Helium.
Sixth period is considered as the longest periods in the periodic table. It contains elements from Cesium to Radon.
Seventh period is incomplete period.
In periodic table Lanthanides and Actinides are shown in the bottom of the periodic table
4 Fe(s) + 3 02(g)
--> 2 Fe₂O3(s)
1. What is the oxidation state of iron (Fe) in the reactant Fe(s)?
2. What is the oxidation state of oxygen (O) in the reactant O2(g)?
3. What is the oxidation state of iron (Fe) in the product Fe2O3(s)?
4. What is the oxidation state of oxygen (O) in the product Fe2O3(s)?
5. In this reaction, iron is... (oxidized or reduced?)
6. In this reaction, oxygen is... (oxidized or reduced?)
7. What was the oxidizing agent in this reaction: Fe(s) or O2(g)?
The oxidation number of reactant Fe is 0 while the oxidation number of iron in the product is +3
What s a redox reaction?The term redox reaction implies a reaction in which there is an increase in the oxidation number of a specie and the decrease in the oxidation number of another specie.
Now we have the answers as follows;
1) The oxidation number of reactant Fe is 0
2) The oxidation number of reactant oxygen is 0
3) The oxidation number of iron in the product is +3
4) The oxidation number of oxygen in the product is -2
5). Iron is oxidized in the reaction
6) Oxygen is reduced in the reaction
7) The oxidizing agent in this case is the oxygen atom
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At STP, 1 mole of gas has a molar volume of 22.4 L. What is the density (g/L) of oxygen at STP?
(Hint: find mass using PV=nRT) and find Density using d=m/v
Which of the following is a property of bases?
A. They are found in fruit.
B. They pollute the air.
C. They taste sour.
D. They are slippery.
A p e x
Answer: D. They are slippery.
Explanation:
Only one of the following is a property of bases. This is option D, they are slippery. Bases usually feel slippery, which can also be described as "soapy." Many soaps, shampoos, detergents, etc contain bases.
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what are the coefficients to balance Ag + Cu(NO3)2 = Cu + AgNO3
Answer:
See below
Explanation:
2 Ag + Cu(NO3)2 = Cu + 2 AgNO3
How much heat is needed to melt 10.0 grams of ice at -10°C until it is water at 10°C?
Group of answer choices
A. +83.6 J
B. +3963 J
C. -3963 J
D. -83.6 J
Taking into account the definition of calorimetry, sensible heat and latent heat, the heat needed to melt 10.0 grams of ice at -10°C until it is water at 10°C is 3,969.5 J.
CalorimetryCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heatSensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
In this case, the amount of heat a body receives or transmits is determined by:
Q = c× m× ΔT
where:
Q is the heat exchanged by a body of mass m. c is a specific heat substance.ΔT is the temperature variation.Latent heatLatent heat is defined as the energy required by a quantity of substance to change state.
When this change consists of changing from a solid to a liquid phase, it is called heat of fusion and when the change occurs from a liquid to a gaseous state, it is called heat of vaporization.
In this case, the heat Q that is necessary to provide for a mass m of a certain substance to change phase is equal to
Q = m×L
where L is called the latent heat of the substance and depends on the type of phase change.
This caseFirst, you have to get the ice from -10°C to 0 °C, which is the melting point. Then you have to melt the ice into liquid water. Now, you have to get the water from 0°C to 10°C.
-10°C to 0 °CIn this case, you know:
c= specific heat capacity of ice= 2.108 [tex]\frac{J}{gK}[/tex]m= 10 gΔT= Tfinal - Tinitial= 0 °C - (-10 °C)= 10 °C= 10 K because being a temperature difference, the difference is the same in °C and K.Replacing in the definition of sensible heat:
Q1= 2.108 [tex]\frac{J}{gK}[/tex]× 10 g× 10 K
Solving:
Q1= 210.8 J
Heat needed to melt iceIn this case, you have to melt the ice into liquid water. Being the specific heat of melting of ice is 334 J/g, the heat needed to melt 10 grams of ice is calculated as:
Q2= 10 grams× 334 J/g
Solving:
Q2= 3,340 J
0°C to 10 °CIn this case, you know:
c= specific heat capacity of liquid water is 4.187 [tex]\frac{J}{gK}[/tex]m= 10 gΔT= Tfinal - Tinitial= 10 °C - 0 °C= 10 °C= 10 K because being a temperature difference, the difference is the same in °C and K.Replacing in the definition of sensible heat:
Q3= 4.187 [tex]\frac{J}{gK}[/tex]× 10 g× 10 K
Solving:
Q3= 418.7J
Total heat required
The total heat required is calculated as:
Total heat required= Q1 + Q2 + Q3
Total heat required= 210.8 J + 3,340 J + 418.7 J
Total heat required= 3,969.5 J
In summary, the heat needed to melt 10.0 grams of ice at -10°C until it is water at 10°C is 3,969.5 J.
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In many regions of the world, humans rely on underground water supplies called aquifers for fresh water. The amount of water an aquifer can store depends in part on the porosity of the rock or sediment in which the water is stored. Porosity is a measure of the amount of liquid that can be stored in a material and is related to the amount of empty space that exists between individual rock or sediment particles. A group of civil engineers wants to determine whether the porosity of surface soil affects aquifer recharge rates-the ability of aquifers to refill with water. The engineers conduct the following study to determine the porosity of the surface soil at various locations. The results of the study will then be compared with the recharge rates of the aquifer each location supplies with water. 1. Collect one 200-milliliter (mL) sample of soil from each of three locations. 2. Place each soil sample in a beaker. 3. Add 200 mL of water to each sample and allow the water to saturate the soil. 4. Measure the amount of standing water in each beaker (amount of water the soil did not absorb). 5. Determine the amount of water in the soil sample by subtracting the amount of standing water from 200 mL. 6. Divide the amount of water in the soil sample by 200 mL and multiply by 100 to determine the percent porosity of the soil. Which change to the experimental design would improve the reliability of the engineers' measurements?
The change to the experimental design that would improve the reliability of the engineers' measurements is C. testing single samples from more than three locations
What is an experimental design?It should be noted that experimental design is the process of carrying out research in an objective as well as a controlled fashion in order for precision to be maximized and specific conclusions can be drawn from the hypothesis statement.
Based on the information, the locations selected are only three. Also, an area must have more types of soil with variable porosity. Hence, the collection of more soil samples may provide more accurate results than collecting soil samples from only three regions.
Therefore, change to the experimental design that would improve the reliability of the engineers' measurements is the testing single samples from more than three locations.
In conclusion, the correct option is C.
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Complete question:
Which change to the experimental design would improve the reliability of the engineers' measurements?
A. using a liquid other than water to determine porosity
B. using flasks instead of beakers
C. testing single samples from more than three locations
D. testing more samples from each location
what is s for silicon tetrachloride Sicl4?
S denotes the ''number of shared electron pairs by an atom'', Hence, Silicon transmits its 4 electrons with 4 Cl-atoms. Thus the Value of S is 4 in SiCl₄ .It is also known as covalency
What is silicon tetrachloride used for?
Silicon Tetrachloride is a transparent, colorless, fuming liquid with an irritating odor. It is used to create Silicon-containing chemicals and in chemical analysis. determine potentially hazardous frontages.
How is silicon tetrachloride produced?Silicon tetrachloride is designed by the chlorination of various silicon compounds such as ferrosilicon, silicon carbide, or mixtures of silicon dioxide and carbon. The ferrosilicon route is most familiar. In the laboratory, SiCl 4 can be prepared by dining silicon with chlorine on 600 °C (1,112 °F): Si + 2 Cl 2 → SiCl.
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draw corresponding structure of 1-cyclophentylhexane.
Answer:
Hexane is a 6-carbon hydrocarbon.
Cyclopentyl is a 5-carbon, hydrocarbon ring.
The 1- indicates that the cyclopentyl is attached to the first carbon in hexane.
Two ways of drawing the structure of 1-cyclopentylhexane are below:
If the pressure of 1.5 moles of a gas is 2 atm and the temperature is 27°C, what is the volume of the gas?
Group of answer choices
A. 9.25 L
B. 5.0 L
C. 37.0 L
D. 18.5 L
Answer:
D
Explanation:
Ideal gas law PV = n RT R = .082057 T must be in Kelvin
n = moles
V = n RT / P
= 1.5 (.082057) ( 27+ 273.15) / 2 = 18.5 liters
2Al(s)+Fe2O3(s) → Al2O(s)+2Fe(s) with a delta H=-847 KJ.
Railroad maintenance initiates a thermite reaction of 4.0 mol Al to connect two lengths of rail using the reaction above. How much heat is released during the reaction?
∆H for given reaction -847kJ
As it's negative reaction is exothermicSo
2 mol of Al releases 847KJ heat
4 mol Al releases
2(847)1694KJ∆H=-1694KJ
It is given that the energy released during the reaction of 2 moles of Al metal is - 847 KJ. The n the heat energy released by 4 moles of Al will be - 1694 KJ.
What is reaction enthalpy?The enthalpy change of a reaction is the heat energy absorbed or released by a reaction. For an endothermic reaction, the heat energy is absorbed and the enthalpy change is positive. For an exothermic reaction, where the energy is released, the enthalpy change will be negative.
The heat energy change during a reaction is equal to the product of mass, specific heat and temperature difference of the substanc eunder reaction or phase transition.
Given that, the heat evolved by 2 moles of Al is - 847 kJ. Then, the heat evolved when 4 moles of Al reacted is calculated as follows:
(4 × - 847) / 2 = - 1694 KJ.
Therefore, the heat energy released is - 1694 KJ.
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If the temperature of a gas is increased from 20°C to 35°C, what is the new pressure if the original pressure was 1.2 atm? Assume that volume is constant.
A. 0.6 atm
B. 1.3 atm
C. 1.0 atm
D. 2.6 atm
The new pressure of the gas would be = 2.1 atm.
Calculation of gas pressureThe initial temperature of the gas(T1) = 20°C
The final temperature of the gas(T2)= 35°C
The volume= constant
The Original pressure (P1) = 1.2atm
The new pressure (P2) =?
Using the gas law P1/T1 = P2/T2
Make P2 the subject of formula;
P2= P1×T2/T1
P2= 1.2 × 35/20
P2= 42/20
P2= 2.1 atm
Therefore, the new pressure of the gas would be = 2.1 atm.
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The empirical formula for a compound is C3H3O the molecular mass is 110 what is its molecular formula
Answer:
emiprical formula is 55
Explanation:
(-^〇^-)
What is the difference between hydrogen bonds and covalent bond in relation to water structure
Answer:
Covalent bonds are intramolecular bonds whereas hydrogen bonds are intermolecular bonds.
hope this helps and good luck :)
What is the oxidation number of nitrogen in nitrogen gas?
Group of answer choices
A. -2
B. -1
C. -3
D. 0
What is the oxidation number of chlorine in KClO3?
Group of answer choices
A. +5
B. +1
C. -5
D. -1
The oxidation number of chlorine in KClO3 is +5 (option A).
How to calculate oxidation number?The oxidation number of an element is the hypothetical charge of an atom within a molecule.
The oxidation number of an element like chlorine in a compound like Pottasium chlorate can be calculated as follows:
The oxidation number of the elements in KClO3 is as follows:
K = +1Cl = xO = -21 + x - 2(3) = 0
x - 5 = 0
x = +5
Therefore, the oxidation number of chlorine in KClO3 is +5.
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Which of the following statements is correct?
Question 12 options:
In an acidic solution, [H+] > [OH-].
In a basic solution, [OH-] > [H+] .
In a neutral solution, [H+] = [OH-] .
All of the above statements are correct.
Answer:
All of the above statements are correct.
Explanation:
acid is a substance that acts as a proton donor, so will have more H+ ions;
basic/alkaline substances act as a proton acceptor, so will have more OH- ions according to bronsted lowry theory
and no to mention neutral means balanced so will have balanced concentration of ions to cancel their charges out.
Determine the osmotic pressure (atm) of an aqueous sugar solution with a
concentration of 2.5 M at 25 °C?
Answer:
61 atm
Explanation:
You can calculate osmotic pressure using the following equation:
π = i MRT
In this equation,
-----> π = osmotic pressure (atm)
-----> i = van't Hoff's factor
-----> M = molarity (M)
-----> R = Ideal Gas Constant (0.08206 atm*L/mol*K)
-----> T = temperature (K)
The van't Hoff's factor is the amount of ions the substance dissociates into. Since sugar does not dissociate, this value is 1. After converting Celsius to Kelvin, you can plug the values into the equation and simplify.
i = 1 R = 0.08206 atm*L/mol*K
M = 2.5 M T = 25 °C + 273.15 = 298.15 K
π = i MRT
π = (1)(2.5 M)(0.08206 atm*L/mol*K)(298.15 K)
π = 61 atm
Which of the following best describes how an ionic compound dissolves in water?
Group of answer choices
A. It separates into individual molecules and is a non-electrolyte.
B. It breaks into its individual ions and is an electrolyte.
C. It separates into individual molecules and is an electrolyte.
D. It breaks into its individual ions and is a non-electrolyte.
The correct answer choice which best describes how an ionic compound dissolves in water is that It breaks into its individual ions and is an electrolyte.
Option B is the correct answer
What is ionic bonding?This is type of chemical bonding which involves the transfer of valence electron from a metallic element to a non-metallic element
So therefore, The correct answer choice which best describes how an ionic compound dissolves in water is that It breaks into its individual ions and is an electrolyte.
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The empirical formula for a compound is C3H3O its molecular mass 110 what is its molecular formula
Answer:
C6H6O2
Explanation:
Total mass of empirical =55
Total mass of compound is 110. So you need to multiply each atims by 2
Why is it important to dispose of waste chemicals in collection vessels, instead of pouring them down the
drain?
Explanation:
Reasons why you should not dispose of chemicals down drains
Pipes, especially older pipes, can leak at connections or where they have been damaged. Often large pipes, like storm water pipes or really large sewage mains, are made out of concrete so at places where two pipes meet, there can be minor leaks. It’s not a big deal when it’s just a little bit of storm water leaking, but if chemicals are also in this water, you’ve just given them a direct path to contaminating drinking water! Also, some of Indianapolis’s infrastructure is very old, and pipes used to be made out of things like bricks and hollowed out trees which will also leak.
Disposing of chemicals down drains can damage your plumbing which can be expensive to repair and also allow those chemicals a direct path into the groundwater.
Improperly disposing of chemicals at your site can lead to environmental contamination of your site which can be time consuming and expensive to clean up.
What is one thing people can do to reduce the amount of carbon in the
atmosphere?
A. Drive longer distances.
B. Plant more trees.
C. Burn more fossil fuels.
D. Use more electricity.
Answer:
B
Explanation:
Planting trees sequesters CO2
all of the other choices produce more CO2 in the atmosphere
Aluminum has a face-centered cubic lattice with all atoms at lattice points. Its atomic mass is 26.982 amu. (4 r = 1(2)^1/2 ; Avogadro's # is 6.022 x 10^23)
a) If each aluminum atom has a radius of 143 pm, what is the edge length of the unit cell?
b) Calculate the density of aluminum metal.
(a) The edge length of the unit cell is 286 pm.
(b) The the density of aluminum metal is 1.27 x 10⁻²³ g/cm³.
What is edge length of the aluminum atom?
The edge length of the aluminum atom is calculated as follows;
a = 2r
where;
r is the radius of the atoma is edge lengtha = 2 x 143 pm = 286 pm
Volume of the aluminum atomV = a³
V = (286 x 10⁻¹²)³
V = 2.34 x 10⁻²⁹ m³
Density of the aluminum metalρ = ZM/VN
where;
Z is 4 for face-centered cubicM is mass of aluminum atom (g/mol), 26.982 amu = (1.66 x 10⁻²⁴ x 26.982) = 4.479 x 10⁻²³ g/molV is volumeN is Avogadro's numberρ = (4 x 4.479 x 10⁻²³) / ( 2.34 x 10⁻²⁹ x 6.023 x 10²³)
ρ = 1.27 x 10⁻¹⁷ g/m³
ρ = 1.27 x 10⁻¹⁷ g/m³ x (1 m³ / 10⁶ cm³)
ρ = 1.27 x 10⁻²³ g/cm³
Thus, the edge length of the unit cell is 286 pm and the the density of aluminum metal is 1.27 x 10⁻²³ g/cm³.
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In the chemical reaction:
Cu + 2AgNO3 → 2Ag + Cu(NO3)2
What is the limiting reactant if you start with 1.8 moles of copper and 2.0 moles of silver nitrate?
Group of answer choices
A. copper (II) nitrate
B. copper
C. silver
D. silver nitrate
Answer:
d
Explanation:
d
Question 2 of 10
What button on a scientific calculator is used to enter a number in scientific
notation?
Answer:
It's the button with the x, and a blank box above it.
Explanation:
Check the attachments, you'll see what it looks like. It will probably look different on your calculator, but the icon should be the same or similar.
