Answers
Answer:
D. electron
Explanation:
Electrons have a negative charge
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In metallic bonds, the mobile electrons surrounding the positive ions are called a(n)
Answers
0.0340 g O2
Step 1. Write the balanced chemical equation
4Fe(OH)^(+) + 4OH^(-) + O2 + 2H2O → 4Fe(OH)3
Step 2. Calculate the moles of Fe^(2+)
Moles of Fe^(2+) = 50.0 mL Fe^(2+) × [0.0850 mmol Fe^(2+)/1 mL Fe^(2+)]
= 4.250 mmol Fe^(2+)
Step 3. Calculate the moles of O2
Moles of O2 = 4.250 mmol Fe^(2+) × [1 mmol O2/4 mmol Fe^(2+)]
= 1.062 mmol O2
Step 4. Calculate the mass of O2
Mass of O2 = 1.062 mmol O2 × (32.00 mg O2/1 mmol O2) = 34.0 mg O2
= 0.0340 g O2
0.0342 grams of O2 are consumed to precipitate all of the iron in 50.0 mL of 0.0850 M Fe(II) solution.
To solve this problem, we need to first calculate the number of moles of Fe(II) in 50.0 mL of 0.0850 M Fe(II) solution.
Moles of Fe(II) = (0.0850 mol/L) * (50.0 mL) = 0.00425 mol
According to the balanced chemical equation, 4 moles of Fe(II) react with 1 mole of O2. Therefore, the number of moles of O2 required to precipitate all of the iron in 50.0 mL of 0.0850 M Fe(II) solution is:
Moles of O2 = (0.00425 mol Fe(II)) * (1 mol O2 / 4 mol Fe(II)) = 0.00106 mol O2
Now we can convert the moles of O2 to grams using the molar mass of O2 (32.00 g/mol):
Grams of O2 = (0.00106 mol O2) * (32.00 g/mol) = 0.0342 g O2
Therefore, 0.0342 grams of O2 are consumed to precipitate all of the iron in 50.0 mL of 0.0850 M Fe(II) solution.
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Alkaline Earth Metals
Alkali metals
Noble Gases
Lanthanides
Answers
Answer:
alkali metals- Group 1
Explanation:
they have less valence electrons and therefore are more reactive
Answers
Answer : The mass of evaporated must be, 1.217 kg
Explanation :
First we have to calculate the moles of water.
Molar mass of water = 18 g/mol
Now we have to calculate the heat released.
Heat released = Moles of water × Molar heat of fusion of ice
Heat released = 29.17 mol × 6.01 kJ/mol
Heat released = 175.3 kJ
Now we have to calculate the moles of
Heat = Moles of × Molar heat of vaporization of
175.3 kJ = Moles of × 17.4 kJ/mol
Moles of = 10.07 mol
Now we have to calculate the mass of
Molar mass of = 120.9 g/mol
Thus, the mass of evaporated must be, 1.217 kg
b. [Xe] 6s24f145d2
c. [Ar] 4s23d5.
Answers
Answer:
Explanation:
the electron configuration is defined as the distribution of electrons of an atom or molecule in atomic or molecular orbitals. It is
used to describe the orbitals of an atom in its ground state
The valence electrons, electrons in the outermost shell, can be used to know the chemical property
a)
Chemical Name of the Element: Selenium
Chemical Symbol: Se
Group it belong in periodic table:6A
Other Element in the same group:tellurium(Te),,sulfur(S)
atomic number = 34
Selenium is a chemical element that has symbol Se It is a nonmetal which is usually classified as metalloid with properties that are intermediate between the elements above and below in the periodic table.
b)Chemical Name of the Element:Hafnium
Chemical Symbol: Hf
Group it belong in periodic table:4B
Other Element in the same group: Titanium( Ti )Rutherfordium
atomic number: 72
Hafnium is a solid at room temperature.
c)Chemical Name of the Element: Manganese
Chemical Symbol:Mg
Group it belong in periodic table:Mn
Other Element in the same group:Bohrium(Bh) ,Technetium(Tc)
Answers
Answer:
(Incomplete question)
Assuming the molarity of the weak acid is 17.4 M, the answer would be 52.4mL.
Explanation:
Equivalence point is defined as the point where moles of titrant = moles of titrand (analyte).
At equivalence point,
# moles of NaOH = # moles of weak acid
# moles of NaOH = 0.1236 × 12.43 mL
= 0.1236 mol/L × 0.01242 L
= 0.00153511 moles of NaOH
= 0.00153511 moles of weak acid.
Since the concentration of acid is not stated in your question, we will assume the concentration of the acid to be 17.4 M.
concentration = no. of moles ÷ volume
⇒ vol. = no. of moles ÷ conc.
= 0.00153511 mol ÷ 17.4 mol/L
= 0.0267 L ≈ 26.7 mL
This means that the total volume of the solution at the half equivalence point will be:
26.7 mL + 26.7 ml
= 52.4 mL.
N.B: Confirm missing variable from question: it could be concentration or volume of acid,but it is impossible to have two unknowns. Also, incase its pH of acid that's given, you can solve problem using Henderson-Hasslebauch equation.
Answers
The correct option is B.
Which process occurs in a voltaic cell?
A voltaic cell is an electrochemical cell that uses a chemical reaction to produce electrical energy. The important parts of a voltaic cell: The anode is an electrode where oxidation occurs. The cathode is an electrode where reduction occurs.
What kind of energy is converted in a galvanic cell?
A galvanic cell is an electrochemical cell that converts the free energy of a chemical process into electrical energy. A photogalvanic cell is one that generates species photochemically which react resulting in an electrical current through an external circuit.
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Answer:
B) chemical energy to electrical energy
Explanation: