Answer:
Most common oxidation states: +2, +3
M.P. 1535º
B.P. 2750º
Density 7.87 g/cm3
Characteristics: Iron is a gray, moderately active metal.
Characteristic reactions of Fe²⁺ and Fe³⁺
The [Fe(H2O)6]3+ ion is colorless (or pale pink), but many solutions containing this ion are yellow or amber-colored because of hydrolysis. Iron in both oxidation states forms many complex ions.
Aqueous Ammonia
Aqueous ammonia reacts with Fe(II) ions to produce white gelatinous Fe(OH)2, which oxidizes to form red-brown Fe(OH)3:
Fe2+(aq)+2NH3(aq)+3H2O(l)↽−−⇀Fe(OH)2(s)+2NH+4(aq)(1)
Fe3appt.gif
Aqueous ammonia reacts with Fe(III) ions to produce red-brown Fe(OH)3:
Fe3+(aq)+3NH3(aq)+3H2O(l)↽−−⇀Fe(OH)3(s)+3NH+4(aq)(2)
Fe3bppt.gif
Both precipitates are insoluble in excess aqueous ammonia. Iron(II) hydroxide quickly oxidizes to Fe(OH)3 in the presence of air or other oxidizing agents.
Sodium Hydroxide
Sodium hydroxide also produces Fe(OH)2 and Fe(OH)3 from the corresponding oxidation states of iron in aqueous solution.
Fe2+(aq)+2OH−(aq)↽−−⇀Fe(OH)2(s)(3)
Fe4appt.gif
Fe3+(aq)+3OH−(aq)↽−−⇀Fe(OH)3(s)(4)
Fe4bppt.gif
Neither hydroxide precipitate dissolves in excess sodium hydroxide.
Potassium Ferrocyanide
Potassium ferrocyanide will react with Fe3+ solution to produce a dark blue precipitate called Prussian blue:
K+(aq)+Fe3+(aq)+[Fe(CN)6]4−(aq)↽−−⇀KFe[Fe(CN)6](s)(5)
Fe5a1ppt.gif
With Fe2+ solution, a white precipitate will be formed that will be converted to blue due to the oxidation by oxygen in air:
2Fe2+(aq)+[Fe(CN)6]4−(aq)↽−−⇀Fe2[Fe(CN)6](s)(6)
Fe5a2ppt.gif
Many metal ions form ferrocyanide precipitates, so potassium ferrocyanide is not a good reagent for separating metal ions. It is used more commonly as a confirmatory test.
Potassium Ferricyanide
Potassium ferricyanide will give a brown coloration but no precipitate with Fe3+. With Fe2+, a dark blue precipitate is formed. Although this precipitate is known as Turnbull's blue, it is identical with Prussian blue (from Equation 5).
K+(aq)+Fe+2(aq)+[Fe(CN)6]3−(aq)↽−−⇀KFe[Fe(CN)6](s)(7)
Fe5b.gif
Potassium Thiocyanate
KSCN will give a deep red coloration to solutions containing Fe3+:
Fe+3(aq)+NCS−(aq)↽−−⇀[FeNCS]+2(aq)(8)
Fe5cppt.gif
No Reaction
Cl−, SO2−4
Zn + O2= ZnO
How many moles of zinc are needed to make 500. g of zinc oxide?
Answer:
5.15 moles
Explanation:
2zn + o2 = 2zno
5.15 2.57 5.15 moles
nzno=500/(16x2+65)= 5.15 moles
-> nzn = 5.15 x 2 ÷ 2 = 5.15 moles
✞how are snythetic detergents better than soap??⭐⭐㋛
Answer:
Advantages of synthetic detergents over soaps: Detergents can work with hard water too while soaps cannot. Synthetic detergents are stronger cleansing agents than soaps.
Explanation:
sorry if I'm wrong
Which of the following is NOT a correct ordering of subshells in the periodic table?
O 2p < 35
O 3d < 4p
O 3d < 45
04s < 4p
3d < 4s is NOT a correct ordering of subshells in the periodic table because 4s is at a lower energy level than 3d.
According to the Aufbau principle, The electron configuration of an element tells how electrons of that element are arranged in thier subshells from their lowest energy state before the highest energy state.
For example, before a 2s subshell can be occupied, A 1s subshell must be filled.
The orbitals are filled in this order:
1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s,
For example, Na (sodium) with 11 atomic number is written as 1s2 2s2 2p6 3s1
Therefore,
2p < 3s True
3d < 4p True
3d < 4s False
4s < 4p True
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What is the electron configuration for Cs^1+ ?
Answer:
electron configuration Cesium Electronic Configuration [Xe] 6s1
Explanation:
Why can’t we reach “absolute zero”?
multiple answers, Ion formed by Oxygen?
O2+
O2-
Oxide
Answer:
Explanation:The formation of the oxide ion, O
2−
(g), from oxygen atom requires first an exothermic and then an
endothermic step as shown below:
O(g)+e
−
→O
−
(g);Δ
f
H
⊖
=−141kJmol
−1
O
−
(g)+e
−
→O
2−
(g);Δ
f
H
⊖
=+780kJmol
−1
Thus, process of formation of O
2−
in gas phase is unfavourable even though O
2−
is isoelectronic with neon. It is due to the fact that:
how do you use an enchantment table in mine-craft. Please actually answer.
Answer:
You place an enchantment ta ke then you place a weapon or armor and press enchant. I hope this helps
Explanation:
Answer:
Depends on what you need to enchant
Explanation:
You can enchant any tools or armor if you put lapis in the box with a symbol and you have enough exp which will show up next to the enchantment you can enchant those and you can also enchant any normal books that way
The electronic structure 1s22s22p63523p64523d8 refers to the ground state of
Kr.
Ni.
Pd.
Fe.
none of the above.
Previous
The given electronic configuration 1s²2s²2p⁶3s²3p⁶4s²3d⁸ is the Nickel (Ni). Therefore, option (B) is correct.
What is an electronic configuration?The electron configuration can be explained as electrons being filled in different energy levels of an atom of a particular element. In the electron configuration, the number of electrons is usually written as a superscript of atomic subshells. For example, the electron configuration of Oxygen is written as 1s²2s²2p⁴.
The sequence of fully filled subshells that correspond to the electronic configuration of a noble gas is denoted by square brackets. The principal quantum number (n) can be used to evaluate the maximum number of electrons in an electron shell.
The value of 2n² is given the maximum number of electrons. The atomic orbitals at low energy must be filled first occupying an orbital with a higher energy level.
The total number of electrons filled in the given electronic configuration 1s²2s²2p⁶3s²3p⁶4s²3d⁸ is 28. The atomic number of Nickel is 28 therefore it is the configuration of Nickel.
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How much heat is necessary to 20g of water at 100*C into steam at 100*C?
Answer:
To convert 100.0 g of water at 20.0 °C to steam at 100.0 °C requires 259.5 kJ of energy.
The amount of heat which is required for a phase change of a substance without any change in temperature is known as latent heat. Here the amount of heat required is 10,800 calories.
What is heat capacity?The heat capacity of a substance or a system is defined as the amount of heat required to raise its temperature through 1°C. It is denoted by C. The specific heat capacity is the amount of heat required to raise the temperature of 1 gram of the substance through 1°C.
The equation to calculate the heat required is:
Q = mc (T₂ - T₁) + mL₁
L = Latent heat of vaporization of water
m = mass
c = specific heat capacity
T₂ = Final temperature
T₁ = Initial temperature
T₂ - T₁ = 100 - 100 = 0°C
Q = 20 g × 1 cal /g°C × 0°C + 20 g × 540 cal/g
Q = 10,800 calories
Thus the amount of heat required is 10,800 calories.
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2.
Which form of cell division produces four cells with chromosomes different from the
parent cell?
B
budding
dominant
meiosis
Dmitosis
Answer:
meiosis
Explanation:
Balance an equation
Answer:
no
Explanation:
s ss s s s s s s s s s s s s ss s s s s dkfkf f f f f f f f
2567 milliliters to liters
Answer:
2.567
Explanation:
To change milliliters into liters you divide by 1000
So when you divide 2567 by 1000 you get 2.567
Which of the following would have more inertia than a car:
A)a person
B)airplane
C)skateboard
D)bicycle
PLEASE HELP
Caltrain tablets contains calcium carbonate. If one tablet requires 34.46 mL of 0.291 M solution of hydrochloric acid for neutralization, how many milligrams of calcium carbonate is in this caltrate tablet?
There are 500 mg of calcium carbonate is in this caltrate tablet
The equation of the reaction is;
2HCl(aq) + CaCO3(aq) ------> CaCl2(aq) + CO2(g) + H2O(l)
Next, we have to obtain the amount HCl reacted as follows;
Number of moles = concentration × volume
Volume = 34.46 mL or 0.03446 L
Concentration = 0.291 M
Number of moles = 0.291 M × 0.03446 L
Number of moles = 0.01 moles
Since the reaction of HCl and CaCO3 are in the ratio of 2:1
2 moles of HCl reacts with 1 mole of CaCO3
0.01 moles of HCl reacts with 0.01 moles × 1 mole/2 moles
= 0.005 moles of CaCO3
Mass of CaCO3 = number of moles × molar mass
Mass of CaCO3 = 0.005 moles of CaCO3 × 100 g/mol
Mass of CaCO3 = 0.5 g or 500 mg
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A student wants to know why sandhill crane‘s fly south for the winter. The student uses a map of North America to make a model of the paths sandhill cranes take as they migrate. The student draws lines with arrows to show the routes sandhill cranes are known to take. Which two issues describe limitations of the students models?
Two limitations of the student's models are that the models do not explain why the phenomenon occurs and the models only record the phenomenon in a limited way
Understanding a specific phenomenon requires gathering and analyzing data thoroughly because the researcher needs to collect data that is directly related to the phenomenon and this data needs to be complete and accurate to have reliable conclusions.
In this situation, the student created some models of the routes of the sandhill crane's migration. This data has two main limitations:
It does not answer the question "why?": If the student wants to understand why these birds go to the South, the models are not very useful because they show "how" these birds migrate but not the reason for this migration.It records the migration only in a limited way: For the models to be complete the student needs to record the migration pattern for two years or more, as the pattern might changeBased on this, two limitations of the models are that they do not explain the phenomenon and the data is not complete.
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A large office building is 1.07 102 m long, 31 m wide, and 4.25 x 102 m high. What is its volume?
Answer:
1409725 m^3
Explanation:
volume = length * width * height
volume = (1.07e2) * (31) * (4.25e2)
volume = 1409725 m^3
Molybdenum can form a wide series of halide compounds, including four different fluoride compounds. The percent by mass of molybdenum in the four compounds is 63.0%,
56.0%,
50.0%,
and 46.0%.
Determine the formula and name for each of the four different molybdenum fluorides.
The formula and names of the compounds are:
1. Formula of compound => MoF₃
Name of compound => Molybdenum trifluoride
2. Formula of compound => MoF₄
Name of compound => Molybdenum tetrafluoride
3. Formula of compound => MoF₅
Name of compound => Molybdenum pentafluoride
4. Formula of compound => MoF₆
Name of compound => Molybdenum hexafluoride
1. Determination of the name and formula of the molybdenum fluoride having 63.0% of molybdenum.
Molybdenum (Mo) = 63.0%
Fluorine (F) = 100 – 63 = 37%
Formula =?Mo = 63.0%
F = 37%
Divide by their molar mass
Mo = 63.0 / 96 = 0.656
F = 37 / 19 = 1.947
Divide by the smallest
Mo = 0.656 / 0.656 = 1
F = 1.947 / 0.656 = 3
Therefore,
Formula of compound => MoF₃
Name of compound => Molybdenum trifluoride
2. Determination of the name and formula of the molybdenum fluoride having 56.0% of molybdenum.
Molybdenum (Mo) = 56.0%,
Fluorine (F) = 100 – 56 = 44%
Formula =?Mo = 56%
F = 44%
Divide by their molar mass
Mo = 56 / 96 = 0.583
F = 44 / 19 = 2.316
Divide by the smallest
Mo = 0.583 / 0.583 = 1
F = 2.316 / 0.583 = 4
Therefore,
Formula of compound => MoF₄
Name of compound => Molybdenum tetrafluoride
3. Determination of the name and formula of the molybdenum fluoride having 50.0% of molybdenum.
Molybdenum (Mo) = 50.0%,
Fluorine (F) = 100 – 50 = 50%
Formula =?Mo = 50%
F = 50%
Divide by their molar mass
Mo = 50 / 96 = 0.520
F = 50 / 19 = 2.632
Divide by the smallest
Mo = 0.520 / 0.520 = 1
F = 2.632 / 0.520 = 5
Therefore,
Formula of compound => MoF₅
Name of compound => Molybdenum pentafluoride
4. Determination of the name and formula of the molybdenum fluoride having 46.0% of molybdenum.
Molybdenum (Mo) = 46.0%,
Fluorine (F) = 100 – 46 = 54%
Formula =?Mo = 46%
F = 54%
Divide by their molar mass
Mo = 46 / 96 = 0.479
F = 54 / 19 = 2.842
Divide by the smallest
Mo = 0.479 / 0.479 = 1
F = 2.842 / 0.479 = 6
Therefore,
Formula of compound => MoF₆
Name of compound => Molybdenum hexafluoride
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COMO CREES QUE SE PODRIA SOLUCIONAR LA POBREZA ) SI NO SABEN NO CONTESTEN :( EL QUE ME AYUDE LE DOY CORONA POR FA VOR
Answer:
AUMENTA EL SALARIO MÍNIMO Y CREA MÁS EMPLEOS
Explanation:
Each atom consists of a central nucleus and several shells that contain electrons. The outermost electrons are called valence electrons. Most atoms are stable with a configuration of eight valence electrons. This is known as the octet rule. How many valence electrons does each atom have?
If you are talking about an atom with a full octet, then it would just have a full shell of 8 valence electrons.
Answer:
valence
Explanation:
What is the law of conservation of energy and how do we know this is true?
Answer:The law of conservation of energy states that energy can neither be created nor destroyed - only converted from one form of energy to another. This means that a system always has the same amount of energy, unless it's added from the outside. ... The only way to use energy is to transform energy from one form to another.
Answer:
law of conservation of energy is energy cannot be created or destroyed but can be transformed from one form to another
it is true as potential energy can be converted into kinetic energy
The equation below is unbalanced.
C3H8+O2-> CO2+H2O
When the equation below is correctly balanced, what is the coefficient of O2?
A. 2
B. 3
C. 4
D. 5
Please answer!! No links please!!!
Answer:
D. 5
Explanation:
C3H8 + 5O2 = 3CO2 + 4H2O
Carbon = 3 on both sides
Hydrogen = 8 on both sides
Oxygen = 10 on both sides
The balanced chemical equation for C₃H₈ + 5O₂ = 3CO₂ + 4H₂O
What is a balanced chemical equation?A balanced chemical equation is one in which several reactants are equal to several products.
The formulas for the reactants and products are used to create a balanced equation that represents a chemical reaction. It displays how many units of each chemical were used.
The left and right sides of the reaction arrow of a balanced equation have an equal number of each type of atom.
The reactants and products are placed on the left and right sides of the arrow, respectively, to create a balanced equation.
Carbon = 3 on both sides
Hydrogen = 8 on both sides
Oxygen = 10 on both sides
Therefore, The balanced chemical equation for C₃H₈ + 5O₂ = 3CO₂ + 4H₂O.
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The RDI for sodium for adults is 2300mg. What amount of table salt (in grams) contains this quantity of sodium? Express answer to two significant figures and include the appropriate units.
The amount of table salt (in grams) contains this quantity of sodium is 5.844 g.
What is table salt?Table salt is made up of sodium and chloride. The chemical formula of table salt is NaCl. This is a common salt used daily in the kitchen. This gives us a taste of food. And it is also necessary for the body.
The RDI for sodium for adults is given that is 2300 mg. The quantity of sodium is given = 2300 mg = 2.30 g (since the answer is asked in grams)
As we know, table salt is NaCl.
The molar mass of table salt (NaCl) is 58.44 g/mol
The molar mass of sodium (Na) is 23.00 g/mol
So, for 23.00 g sodium, we need 58.44 g NaCl.
And, for 2.30 g sodium we require (58.44 g x 2.3 g) / 23 g = 5.844 g = 6 g (to one significant figure).
Therefore, the amount of sodium is present in 5.844 grams of table salt.
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How can you identify the gas produced in a chemical reaction without observing the atoms and molecules directly?
To identify the gas produced in a chemical reaction without observing the atoms and molecules directly through the characteristics of the gas.
Chemical reaction is defined as the process by which substances (known as reactants) combine together with the formation of bonds to form products.
There are some signs that shows that chemical reaction has occurred. They include:
Color Change Change of temperatureGiving off gas (Evolution of gas)Therefore, the production of gas from a chemical reaction shows that a reaction has occurred.
These gases can be identified without observing the molecules through that characteristics of the gas. This include:
the smell of the gas: For example when a gas is given off, and it smells like urine, it's likely to be ammonia gas. color change that occurs during the chemical reaction can show the type of gas that was given off. For example when lime water turns into milky color, it shows the presence of carbondioxide gas.Learn more here:
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Moon rocks resemble rocks from which of the following layers of the earth?
SECTIONA ANSWERALL QUESTIONS (5 MARKS PER QUESTION) 1:03 mixing a solution of silver nitrate and dilute hydrochloric acid a white precipitate is :o:med inrmediately. 1) Write an equation for the reaction (ii) The precipitate darkens rapidly upon standing. Why? :12 Explain why conductivity measurements of M* in aqueous solutions is in the order: Cs' > Rb'>K" > Na* > Li' A3 Why is it that lithium salts are often hydrated whereas those of the other alkali metals are ofien anhydrous? 44 Explain with the help of chemical equations why BeCl2 is acidic .45(a) State the main types of bonds formed by hydrogen Star lo list three ways of preparing hydrogen 16 Write an equation and identify the element formed when: (a) Polonium 210 undergoes a- decay (b) Actrium 277 undergoes ß- decay (0) Iridium 186 undergoes electron capture d) Bismuth 192 undergoes positron emission (C) Iodine 133 undergoes B- emission 47 The Uranium decay series starts with 238,2Uand ends with 206,2Pb. Each step involves the Luistentie
Answer:..,.,
Explanation:88.,,'
In 1988, three gray whales were trapped in Arctic ice. Television crews captured the frantic attempts of hundreds of people to save the whales. Eventually, a Soviet icebreaker and U.S. National Guard helicopters arrived to help free the whales. The cost of the rescue mission exceeded $5 million.
i. Write a scientific question related to the whale story.
ii. Write a nonscientific question related to the whale story.
The scientific question related to the whale story is how were the whale's rescued? The non-scientific question related to the whale story is what was the need for spending such large amount of money?
What is a scientific question?It is a one where an investigation can be designed and can be approached to completion in order to find out an answer.This can be done without doing different investigations.
It should have valuable information and should have the potential that it can be answered by direct observations.It should always lead to a hypothesis.
A scientific question must have the following characteristics:
It must have an objective and should be testable.It should focus on an independent variable and a dependent variable.It should be feasible and coherent.Whereas, characteristics of a non -scientific question is that they are broad,and have many variables to be tested.
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Which location is Georgia experiencing fall in the diagram above?
Location A
Location B
Location B
Location D
Answer:
Location A
Explanation:
Answer:
location d
Explanation:
Determine the number of moles in 3.50 x 1023
formula units of BaCl2
Answer:
0.58 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{3.5 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{3.5}{6.02} \\ = 0.581395[/tex]
We have the final answer as
0.58 molesHope this helps you
A quarter moon is called this because
Explanation:
A quarter moon is called a quarter moon because it is the moment the moon has reached the first quarter of it orbit around the earth
r.
3. How are elements on the periodic table
arranged? sc.8.P.8.6
A atomic mass
B atomic number
© chemical symbol
D state of matter
no