Answer:
0.670 mol
Explanation:
Step 1: Write the balanced reaction for the decomposition of alumina
2 Al₂O₃ ⇒ 4 Al + 3 O₂
Step 2: Calculate the moles corresponding to 34.2 g of Al₂O₃
The molar mass of Al₂O₃ is 101.96 g/mol.
34.2 g × 1 mol/101.96 g = 0.335 mol
Step 3: Calculate the moles of Al produced from 0.335 moles of Al₂O₃
The molar ratio of Al₂O₃ to Al is 2:4.
0.335 mol Al₂O₃ × (4 mol Al/2 mol Al₂O₃) = 0.670 mol Al
(b) What is the solubility of lead chromate in moles per dmcube ksp
for PbC10,=2.8x10*-13 mole/dmº
The solubility of lead chromate : s= 5.29 x 10⁻⁷ mol/L
Further explanationGiven
Ksp for PbCl,=2.8x10*-13 mole/dmº
PbCrO4
Required
The solubility
Solution
P b C r O ₄ ( s ) ⇌ P b²⁺( a q) +C r O ₄ ⁻²( a q )
s s s
s= solubility
Ksp P b C r O ₄ = s²
K s p = [ P b ²⁺] [C r O ₄ ⁻² ]= 2.8x10⁻¹³
s = √2.8x10⁻¹³
s= 5.29 x 10⁻⁷ mol/L
Which is the weakest type of intramolecular force/bond?
a. Polar covalent b. Ionic c. Metallic d. Nonpolar covalent
Answer:
Non polar covlant
Explanation:
What Is an example of weather?
A. The average rainfall in Arizona over the pervious three months
B. The increase in temperature over North America over the past decade
C. The time for high tide in Daytona Beach today
D. The temperature and wind speed in Philadelphia today
(I will give a Brainliest)
How would you describe the change in the arrangement of particles as heat energy and
temperature increase?
at the molecular level what form of energy do the molecules have?
Answer:
kinetic energy I think so
The form of energy molecules have at the molecular level is Kinetic energy.
Kinetic energy is defined as the energy possessed by a body as a result of its motion or movement.
Molecules interact with one another through various movements that occur
within them. This happens to aid the formation of new substances in the
ecosystem. The three states of matter exhibit varying degree of movement
within its molecules.
The energy is usually in the form of chemical energy also and is the reason
why kinetic energy is the most suitable choice.
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radiation is a measure of average kinetic energy of particles in an object true or false
Answer:false
Explanation:
What is one way in which sound and light are alike? PLEASE HELP IF YOU WANT BRAINLEIST AND TO HAVE YOUR COMMENT LIKED!!
A. They both travel easily through wood.
B. They are both types of energy.
C. both can travel through outer space.
D. They both make it easier for you to see what you are doing.
Answer:
They are both types of energy.
Explanation:
The last 2 are true for light, and the first one is true for sound.
Hope this is right, sorry if it is not.
9. Which of these is not a mixture? *
Solution
Alloy
Amalgam
They are all mixtures.
Answer:
They are all mixture
Explanation:
last option
How do sound waves travel? PLEASE HELP IF YOU WANT BRAINLEIST AND ME TO LIKE URE COMMENT!!
A. Sound causes the air near it to vibrate inwards.
B. waves radiate outward from a central point.
C. Sound moves randomly in different directions.
D. Sound transforms waves into different frequencies.
The answer is A. The vibration caused by the waves through the air eventually weaken, which is why sound diminishes easily over distance.
Using the two cell reduction potentials shown for their corresponding reaction, calculate the cell potential for a voltaic cell made from these two systems.
Question 17 options:
A)
1.68 V
B)
–0.78 V
C)
0.78 V
D)
–1.68 V
Answer:
Theory- 1 to 7
Explanation:
Exercise- 8 to 25
ect
The right alternative is Option D (0.78 V).
According to the question,
By putting the values, we get
Cu+2 + 2e → Cu E = 0.52 V
Ag+1 + 1e Ag E° = 0.78 V
= 1.23 - 0.45
= 0.78.
Is cell potential negative or positive?negative
The standard cell potential is quite negative, so the reaction will not occur spontaneously as written.
Missing parts of the question.
Using the two cell reduction potentials shown for their corresponding reaction, calculate the cell potential for a voltaic cell made from these two systems: 0.78.
Cu+2 + 2e → Cu E = 0.52 V
Ag+1 + 1e Ag E° = 0.80 V
options:
A)
0.28 V
B)
–1.32 V
C)
1.32 V
D)
–0.28 V
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Which is one piece of information that "9” gives about an atom of fluorine?
The atomic mass is different than the atomic number, and the number of neutrons is the difference between the atomic mass and the atomic number.
the atomic number
the atomic mass
the mass of protons
the number of neutrons
Answer:
The Atomic Number
Explanation:
i need help
can anyone help me
A Gold ring is a what?
Element
Compound
Colloid
Alloy
Answer: Alloy
Explanation: gold is an alloy, or mixture of metals
QUESTION 4
How many significant figures are in the number 0.000020?
O A. 1
OB.2
O C.3
OD.4
Answer:
B) 2
Explanation:
There are two significant figures in given measurement,
2, 0
Significant figures:
1= The given measurement have four significant figures 1534.
2= All non-zero digits are consider significant figures like 1, 2, 3, 4, 5, 6, 7, 8, 9.
3= Leading zeros are not consider as a significant figures. e.g. 0.03 in this number only one significant figure present which is 3.
4= Zero between the non zero digits are consider significant like 107 consist of three significant figures.
5= The zeros at the right side e.g 2400 are also significant. There are four significant figures are present.
1
Give two reasons that show sugar is a compound
2
What is the difference between carbon (charcoal and suga? Compra ad 1
which animal takes on the temperature of their surroundings and does not use food energy to keep warm
The atomic number tells the number of
Find the molar mass of C3H60
Answer:
The molar mass and molecular weight of C3H6O is 58.0791.
Explanation:
A 4.0g Glass was heated from 5°C to 45°C after absorbing 32 J of heat. What is the specific heat of the glass? 
Answer:
[tex]c=0.2\ J/g^{\circ} C[/tex]
Explanation:
Given that,
Mass of a glass, m = 4 g
Initial temperature, [tex]T_i=5^{\circ} C[/tex]
Final temperature, [tex]T_f=45^{\circ} C[/tex]
Heat absorbed, Q = 32 J
We need to find the specific heat of the glass. The formula for the heat absorbed is given by :
[tex]Q=mc\Delta T\\\\c=\dfrac{Q}{m\Delta T}\\\\c=\dfrac{32\ J}{4\ g\times (45-5)^{\circ} C}\\\\=0.2\ J/g^{\circ} C[/tex]
So, the required specific heat of the glass is [tex]0.2\ J/g^{\circ} C[/tex].
Will give brainliest
Is this structure named correctly???
Pls answer me fast guys!!
Answer:
No; According to the IUPAC , it should be
3-bromopentan-2-olb. Which two neutral elements have different numbers of protons but similar properties?
Answer:
Helium and neon
Explanation:
(I will give a brainliest) State the relationship between phase changes and temperature
Answer:
The relationship is the "variation of vapour pressure with temperature" or " the effect of vapour pressure on the melting and boiling points in a phase"
A 275 g sample of a metal requires 10.75 kJ to change its temperature from 21.2 oC to its melting temperature, 327.5 oC. What is the specific heat of this metal
Answer:
[tex]c=0.127\ J/g^{\circ} C[/tex]
Explanation:
Given that,
Mass of the sample, m = 275 g
It required 10.75 kJ of heat to change its temperature from 21.2 °C to its melting temperature, 327.5 °C.
We need to find the specific heat of the metal. The heat required by a metal sample is given by :
[tex]Q=mc\Delta T[/tex]
c is specific heat of the metal
[tex]c=\dfrac{Q}{m\Delta T}\\\\c=\dfrac{10.75\times 10^3\ J}{275\times (327.5 -21.2)}\\\\=0.127\ J/g^{\circ} C[/tex]
So, the specific heat of metal is [tex]0.127\ J/g^{\circ} C[/tex].
Write down the possible types of atomic
Orbitals of n=4
Answer:
2
Explanation:
because first shell ( k shell ) needs only 2 electron to complete its octet .
hope it helps
Question 4
Being Left Handed is a recessive trait so it would be represented by two lowercase letters like (hh)
Your answer:
O
True
False
Answer:
True
Explanation:
What is the standard reduction potential, E, for the half-reaction Al(aq) +
3e→ Al(s)?
OA. -0.76 V
OB. -1.68 V
Oc. 2.37 V
OD. 2.71 V
SUBMIT
The standard reduction potential for the given question is-1.68 V, under the condition that the given half-reaction is Al(aq) +3e→ Al(s), then the required answer to the given question is Option B.
The standard reduction potential refers to the potential difference comparing the standard hydrogen electrode (SHE) and the half-reaction. The (SHE) possess a standard reduction potential of 0 V at all temperatures.
Hence, the standard reduction potential for the half-reaction Al(aq) + 3e→ Al(s) can be evaluated as follows
E°(Al₃⁺(aq) + 3e⁻ → Al(s)) - E°(H⁺(aq) + e⁻ → 1/2H₂(g))
= -1.66 V - 0 V
= -1.66 V
≈ -1.68 V
A half-reaction can occur for either the oxidation or reduction reaction component of a redox reaction. It projects the change in oxidation states of the substances involved. Half-reactions are applied to describe the processes in an electrochemical cell, in which one metal is oxidized at the anode and another metal is reduced at the cathode.
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Answer:
B
Explanation:
-1.68 V
What happens at the anode in an electrolytic cell?
A. Turning an ion into an uncharged atom
B. Melting
C. Reduction
D. Oxidation
Answer:
D. Oxidation
Explanation:
In an electrolytic cell, oxidation (the loss of electrons) takes place at the anode. At the cathode reduction takes place.
A mnemonic technique that could be used is that the process that starts with a vowel (Oxidation) takes place at the place that also starts with a vowel (Anode).
A root is an example of a/an-
A: tissue
B: cell type
C:organ
D:organism
Answer: D an organism
Explanation:
Identify the type of solid from the description. Select from the following choices: metallic solid, network solid, molecular solid, ionic solid, or amorphous solid
Identify the type of solid from the description. Select from the following choices: metallic solid, network solid, molecular solid, ionic solid, or amorphous solid. a. This solid is ductile and conducts electricity.b. This solid is not conductive and has a low melting point.
Answer:
See explanation
Explanation:
A is a Metallic Solid
Let us look again at the physical properties of metals;
Metals are
DuctileMalleableSonorousHigh melting pointConducts electricityWe can now see that both ductility and electrical conductivity are metallic properties.
B is a Molecular solid
Molecules are formed when atoms share electrons. In molecules, there are no free electrons hence molecules do not conduct electricity.
Secondly, molecules are held together in the solid state by weak dispersion forces hence molecular solids have a low melting point.
