An aqueous solution of 4 mol/L nitric acid is electrolysis in an electrolytic cell using graphite electrodes.
Name the gas given off at the anode
The gas given off at the cathode is hydrogen while the gas given off at the anode is oxygen.
What is electrolysis?The term electrolysis has to do with the decomposition of a substance by the passage of a direct current through it.
The ions present in the system are[tex]H^+[/tex], [tex]OH^-[/tex] and [tex]NO_3^-[/tex] ions. The gas given off at the cathode is hydrogen while the gas given off at the anode is oxygen.
The half-reaction equation of the reduction is;
[tex]2H^+(aq) + e[/tex] → [tex]H_2(g)[/tex]
The oxidation half-reaction equation is;
[tex]4OH^- (aq)[/tex] → [tex]2H_2O(l) + 4e[/tex]
The overall equation is;
[tex]4H^+(aq) + 4OH^- (aq)[/tex] → [tex]4H_2(g) + 2H_2O(l) + 4e[/tex]
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what is the molecular formula of Ferric Oxide with criss-cross method
Answer: Fe2O3
Explanation: By applying crisscross method, the formula will be Fe2O3.
Which compound contains only nonpolar covalent bonds?.
Answer:
02 or oxygen if im not mistaken
When a scientific theory has been tested and proved by the scientific community, it becomes a law.
True
False
Answer:
False
Explanation:
Because laws and theories are developed for different purposes, laws never become theories, and theories do not become laws.
Convert 951.9 to scientific notation. for this question, a superscript is displayed using ^ (ex.
108 would be e^8).
Answer:
9.519e^-2
Explanation:
To accurately show the number in scientific notation, you need to move the decimal place to the left 2 spaces. Because you are moving the decimal place to the left, the exponent will be a negative number. Because the decimal place moves 2 units to the left, the exponent will be a -2.
Therefore, the answer in correct scientific notation is:
951.9 ----------> 9.519e^-2
You are trying to determine how
many moles of lithium nitrate are in
256 mL of a 0.855 M solution.
How many liters is 256 mL?
Answer:
0,218 moles
Explanation:
I will first explain how many liters is 256ml, that is 0,256 l.
because the m stands for milli which is a factor of 1000 -> (256 ml / 1000 = 0,256 l)
To calculate the amount of moles you multiply the volume with the concentration. So 0,256l x 0,855M = 0,218 moles.
Answer: 0.256
Explanation:
What was the weakness of the rutherford model of the atom that bohr addressed?
The weakness of the rutherford model of the atom that bohr addressed is that
The energy of the atom is quantized andThe atom does not lose energy as the electon rotates about the nucleusWhat is Rutherford model of the atom?The Rutherford model of the atom proposed by Ernest Rutherford in 1911 shows that the atom is much hollow space with its mass concentrated at the center being surrounded by electrons. It is the planetary model.
What is the Bohr model of the atom?The Bohr model of the atom proposed by Neils Bohr in 1913 suggests that
the energy of an atom is quantized and that it does not lose energy as the electron rotates about the nucleus.What was the weakness of the rutherford model of the atom that bohr addressed?The weakness of the rutherford model of the atom that bohr addressed is that
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ls zinc qnd hydrogen chloride combining into sinc chloride and hydrogen gas a chemical or physical change?
Answer:
chemical because it turned into a new compound
Explanation:
is zinc and hydrogen chloride combining into zinc chloride and hydrogen gas a chemical or physical change?
physical change is like boiling, melting, freezing, and shredding
but its still the same compound
chemical is like it turns into something else like a new compound
Zn + 2HCl = ZnCl2 + H2(g)
Metal + Acid → Hydrogen + Acid Anion
new compound forms in this reaction
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Les McLean
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Which group of the periodic table consists of elements that share similar
properties and have 2 electrons in their outer shells?
A. 1
B. 14
C. 13
D. 2
The alkaline earth metals are also referred to as Group 2A. elements are comparable to one another in terms of their electron configurations and thus, their properties.
Alkaline-earth metals:From beryllium (Be) through radium, the alkaline-earth metals comprise Group 2 of the periodic table (Ra). The alkaline earth metals are so reactive because each of these elements has two electrons in its lowest energy level that they are rarely encountered alone in nature. However, they don't react as quickly as alkali metals do. Compared to the alkali metals, their chemical reactions normally proceed more slowly and generate less heat.
Elements and their electronic configuration are listed below:-Be :- [He]2S2
Mg:-[Ne]3S2
Ca :-[Ar]4S2
Sr:-[Kr]5S2
Ba:-[Xe]6S2
Ra:-[Rn]7S2
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Group 2A is another name for the alkaline earth metals, which are similar to one another in terms of their electron configurations and thus, their properties.
Alkaline Earth MetalsGroup 2 of the periodic table is made up of alkaline-earth metals, starting with beryllium (Be) and ending with radium (Ra). The fact that each of these elements possesses two electrons at its lowest energy level makes the alkaline earth metals extremely reactive, which is why they are rarely found by themselves in nature. They don't respond as quickly, though, as alkali metals do. Their chemical reactions often take longer and produce less heat than those of the alkali metals.
Following is a list of elements along with their electronic configuration:-Be:- [He]2S2
Mg:-[Ne]3S2
Ca:-[Ar]4S2
Sr:-[Kr]5S2
Ba:-[Xe]6S2
Ra:-[Rn]7S2
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The atomic mass unit is presently based on assigning an exact integral mass (in amu) to an isotope of an hydrogen oxygen sodium carbon helium
a. hydrogen
b. oxygen
c. sodium
d. carbon
e. helium
Answer: a. hydrogen
This is a fact.
Carbon is the reference taken to assign the atomic mass unit
One twelfth of the mass of unbound carbon-12 is taken as 1amuThe unit for the atomic mass constant is Dalton (Da)This unit is standard when doing calculations in chemistry and physics1amu = 1.6605x10⁻¹⁹gThis was also derived from the law of definite proportionsThis standard has been set by the International Union of Pure and Applied Chemistry (IUPAC)The IUPAC is responsible for assigning various standards such as the nomenclature of various compounds, and updating the periodic table of elements.According to the IUPAC carbon is the reference taken to assign the atomic mass unitLearn more about atomic mass units here:
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What is the equilibrium expression for:
fe3o4(s) + 4h2(g) <=> 3fe(s) + 4h2o(g)
kc =
a)[fe]3 [h2o]4 / [fe3o4] [h2]4
b)[fe3o4] [h2]4 / [fe]3 [h2o]4
c)[h2o]4 / [h2]4
d)[fe] [h2o] / [fe3o4] [h2]
Answer:
c
Explanation:
in kc we only consider gases and aquas not solids and liquids
From 200 mg of CO₂, 1021 molecules are removed. How many molecules of CO₂ are left?
Answer:
CO_(2)` molecules removed `= 10^(21)` <br> No. of `CO_(2)` molecules left `= 2.74 xx 10^(21) - 10^(21) = 1.74 xx10^(21)` <br>
Explanation:
Please help, need it for homework
Answer:
n
Explanation:
nobody knows
What does viscosity describe
There are two common oxides of copper; one is 80% copper and the other is 89% copper by weight. Calculate the formula and name each compound.
Cupric oxide (CuO) and cuprous oxide (Cu2O) are the names of two oxides of copper.
Why both Cupric oxide (CuO) and cuprous oxide differ from one another?Both Cupric oxide (CuO) and cuprous oxide are different from one another because of the presence of number of copper atom. In one compound, copper is bonded with oxygen in 1:1 form whereas in the other compound, the copper is bonded with 2:1 form.
So we can conclude that Cupric oxide (CuO) and cuprous oxide (Cu2O) are the names of two oxides of copper.
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How many molecules are contained in 1.55 moles of methane, CH 4 ?
Avogadro's law states that in one mole of a substance, there are [tex]6.022 \times 10^{23}[/tex] molecules.
This means that in 1.55 moles, there are [tex]1.55(6.022 \times 10^{23})=\boxed{9.33 \times 10^{23} \text{( to 3 sf)}}[/tex]
When water vapor cools, it condenses.
Which number represents this process on the hydrologic cycle
diagram?
O 1
02
O 3
04
Number 2 represents this process on the hydrologic cycle diagram. Therefore, the correct option is option B.
What is hydrologic cycle?One of the most significant natural processes is the hydrologic cycle, which we may often take for granted. This process causes the water in the entire earth to change forms, locations, or accessibility.
Water transitions between three distinct forms during this cycle, to put it simply. It can be found in many states of liquid, gas, or solid, including ice, steam, and water. Water will frequently transition between these three states throughout the cycle: freezing into ice, melting into water, evaporating becoming water vapor, but finally condensing back into water. Number 2 represents this process on the hydrologic cycle diagram.
Therefore, the correct option is option B.
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The temperature of a thermometer
increases during a chemical reaction.What happens to the energy of the reaction (system)?
A. The reaction releases energy (- or exothermic).
B. The reaction absorbs energy (+ or endothermic).
C. The reaction does not cause an energy change.
Answer:
B. the reaction absorbs energy (+ or endothermiic)
What is the volume in L of a 0.825 mole sample of Ar at 600 mm Hg and 300 K?
Answer:
V = 25.7 L
Explanation:
To find the volume of Argon (Ar), you need to use the Ideal Gas Law equation. This looks like:
PV = nRT
In this formula,
> P = pressure (atm)
> V = volume (L)
> n = number of moles
> R = constant (0.0821 L*atm/K*mol)
> T = temperature (K)
While there is a different constant that can be used if you want to keep the pressure in mmHg, there is a more common constant used when the pressure is in atm. So, to find the volume, you need to (1) convert mmHg to atm (by dividing by 760) and then (2) calculate the volume (using Ideal Gas Law).
(Step 1)
600 mm Hg 1 atm
------------------- x --------------------- = 0.789 atm
760 mm Hg
(Step 2)
PV = nRT
(0.789 atm) x V = (0.825 mole)(0.0821 L*atm/K*mol)(300 K)
(0.789 atm) x V = 20.32
V = 25.7 L
this question in the screenshot
Mass of hydrate + crucible = 47.29 g
Mass of anhydrous salt = 2.7 g
Molar mass of anhydrous salt CuSO4 = 159.5 g
Given,
mass of empty crucible = 42.45 g
mass of hydrate salt= 4.84 g
mass of crucible after first heating = 46.1 g
mass of crucible after second heating= 45.153 g
mass of crucible after third heating= 45.15 g
so, as per the question we need to find...
Mass of hydrate + crucible = ? g
Mass of anhydrous salt = ? g
Molar mass of anhydrous salt CuSO4 = ? g
∴Mass of hydrate + crucible = 42.45 + 4.48 = 47.29 g
The given salt is in hydrate form, to remove water from this molecule we need to perform heating .
So we are taking the substance into the crucible as it is in less quantity.
Here, we performed heating 3 times and note the weight after every heating.
After this, assume that the water is totally evaporated and the remaining salt is in anhydrous form,
∴ Mass of anhydrous salt = 45.15 - 42.45 = 2.7 g
To find the molar mass of anhydrous salt of CuSO4,
atomic weight of Cu = 63.5 g
atomic weight of S = 32 g
atomic weight of O =16 g
∴ molar mass of anhydrous salt of CuSO4 = 63.5 + 32 + (16 ×3)
=159.5 gm
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Which of the following processes does not facilitate containment?
OA. Enrichment of uranium-235 is done.
B. Steel-reinforced concrete several feet thick surrounds the plant.
C. Workers wear protective clothing.
D. The water used to cool the fuel rods is enclosed.
SUBMIT
Enrichment of uranium-235 is done. Hence, option A is correct.
What is the meaning of containment?The act, process, or means of keeping something within limits the containment of health costs.
Enrichment is a process of increasing the proportion of fissile isotope found in uranium ore (represented by the symbol 'U') to make it usable as nuclear fuel or the compressed, explosive core of nuclear weapons.
Hence, option A is correct.
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Newton law of motion
Answer:
newtons law states that every body in the universe attracts every other body with a force which is directly proportional to the product of their masses and inversely proportional to square of the distance between their centers
Answer:
an object at rest tends to stay at rest
How many milliliters of a 0.8 solution of citric acid would be needed to react with 15 g of baking soda? Show your work.
225 milliliters of a 0.8 solution of citric acid would be needed to react with 15 g of baking soda.
How to calculate volume?The volume of a substance can be calculated using the following formula:
molarity = no of moles ÷ volume
no of moles of baking soda (NaHCO3) = mass ÷ molar mass
Molar mass of baking soda = 84.007g/mol
no of moles = 15g ÷ 84.007g/mol = 0.18mol
0.8 = 0.18/volume
volume = 0.23L equivalent to 225mL
Therefore, 225 milliliters of a 0.8 solution of citric acid would be needed to react with 15 g of baking soda.
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225 millilitres of a 0.8 solution of citric acid would be needed to react with 15 g of baking soda.
Define molarity of a solution.Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution. Molarity is also known as the molar concentration of a solution.
[tex]Molality = \frac{Moles \;solute}{Volume of solution in litre}[/tex]
[tex]Moles of baking soda (NaHCO_3) =\frac{mass}{molar \;mass}[/tex]
Molar mass of baking soda = 84.007g/mol
[tex]Moles of baking soda (NaHCO_3) =\frac{15g}{84.007g/mol}[/tex]
[tex]Moles of baking soda (NaHCO_3) = 0.18mol[/tex]
Now, calculating volume with the molarity formula:
Molality = [tex]\frac{Moles \;solute}{Volume \;of \;solution \;in \;litre}[/tex]
0.8 = [tex]\frac{0.18 }{Volume \;of \;solution \;in \;litre}[/tex]
Volume = 0.23L equivalent to 225mL
Therefore, 225 milliliters of a 0.8 solution of citric acid would be needed to react with 15 g of baking soda.
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what is the percent composition of each element within the compound
Answer:
The percentage composition of a given compound is defined as the ratio of the amount of each element to the total amount of individual elements present in the compound multiplied by 100. Here, the quantity is measured in terms of grams of the elements present.
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3 Cu + 8HNO3 g 3 Cu(NO3)2 + 2 NO + 4 H2O
In the above equation how many moles of NO can be made when 97.00 moles of HNO3 are consumed?
24.25 moles of NO can be produced using 97 moles of HNO3.
What is balanced chemical equation?Equal numbers of atoms from various elements are present in both the reactants and the products in balanced chemical equations. Varied elements' atom counts in the reactants and products of unbalanced chemical equations are different.
3 Cu + 8HNO3 g → 3 Cu(NO3)2 + 2 NO + 4 H2O
The number of moles consumed can be calculated using comparing with coefficients in the balanced reaction .
So , from above eq we get that 8 moles of HNO3 are consumed to make 2 moles of NO.
⇒ 8 HNO3⇔2 NO
⇒ 1 HNO3⇔ 1/4 NO
This means that for each mole of HNO3 produces 1/4 moles of NO.
So , for 97 moles of HNO3 , [tex]\frac{1}{4} *97[/tex] moles of NO can be made,
So, total moles of NO made are 24.25 moles.
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24.25 moles of NO would be made when 97 moles of [tex]HNO_{3}[/tex] are consumed
Given reaction:
[tex]3 Cu + 8HNO_{3} - > 3 Cu(NO_{3})_{2} + 2 NO + 4 H_{2}O[/tex]
As the given reaction is already balanced so we don't need to balance it
In a balanced chemical reaction the ratio of reactants consumed and products formed always remains constant.
∵ In the given Reaction we can analyse for 8 moles [tex]HNO_{3}[/tex] consumed 2 moles of [tex]NO[/tex] are being produced.
Assuming [tex]x[/tex] moles of [tex]NO[/tex] being produced when [tex]97[/tex] moles [tex]HNO_{3[/tex] produced
∵ Ratio remains constant
⇒[tex]\frac{HNO_{3} Consumed}{NO Produced} = \frac{8}{2} =\frac{97}{x}[/tex]
⇒[tex]x=\frac{97}{4}=24.25[/tex] moles
∴ 24.25 moles of [tex]NO[/tex] would be made.
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A switch controls the current in a circuit that has a large inductance. The electric arc at the switch (Fig. CQ32.3) can melt and oxidize the contact surfaces, resulting in high resistivity of the contacts and eventual destruction of the switch. Is a spark more likely to be produced at the switch when the switch is being closed, when it is being opened, or does it not matter
When the circuit is opened, a spark is much more possible.
What is an inductor?The primary purpose of an inductor is the storage of energy. This is why an inductor helps to eliminate a spark in a circuit.
In the circuit as described in the question, we know that there is no current when the circuit is closed, the current across the inductor remains constant but rapidly decreases at the opening of the circuit this could lead to a spark.
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The hydrogen emission spectrum is shown below. What is the energy of the
410 nm emission line? (The speed of light in a vacuum is 3.00 x 108 m/s, and
Planck's constant is 6.626 x 10-34 J.s.)
400
750 pm
Answer:
C.) 4.85 x 10⁻¹⁹ J
Explanation:
To find the energy, you need to use the following equation:
E = hc / w
In this formula,
-----> E = energy (J)
-----> h = Planck's Constant (6.626 x 10⁻³⁴ J*s)
-----> c = speed of light (3.00 x 10⁸ m/s)
-----> w = wavelength (m)
Once you have converted nanometers to meters, you can plug the given values into the equation and solve.
410 nm 1 m
------------- x ---------------------- = 4.10 x 10⁻⁷ m
1 x 10⁹ nm
E = hc / w
E = (6.626 x 10⁻³⁴ J*s)(3.00 x 10⁸ m/s) / (4.10 x 10⁻⁷ m)
E = 4.85 x 10⁻¹⁹ J
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the hemiacetal below is treated with 18o-labeled methanol (ch3o*h) and acid. where will the label appear in the products?
The label appears in the organic product and not in the water owing to the fact that water is eliminated as -OCH3 replaces -OH.
What is a labeled reaction?Isotopic labelling is one of the methods by which a chemical reaction is studied. In this case, we can see that the reaction occurs with the hemiacetal reacting with a labeled methanol.
By looking at the reaction products we can see that the label appears in the organic product and not in the water owing to the fact that water is eliminated as -OCH3 replaces -OH.
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What temperature, in Kelvin, does a 1.00 gram sample of Ne in a 2.50 L container need to be adjusted to in order to bring the pressure to 1.00 atm? Report your answer to the nearest Kelvin. (Moodle is looking for a number only, no units.)
The temperature of 0.049 moles of a Ne with a pressure of 1.00 atm and a volume of 2.50 L is 621.44K.
How to calculate temperature?The temperature of a given gas can be calculated using the ideal gas law equation:
PV = nRT
Where;
P = pressure = 1.00 atm
V = volume =2.50 L
R = gas law constant = 0.0821 Latm/molK
Mass =1.00 gram
The molar mass of Ne= 20.1797 u
[tex]Moles = \frac{mass}{molar \;mass}[/tex]
[tex]Moles = \frac{1.00}{20.1797}[/tex]
Moles = 0.049mol
T = temperature=?
Putting the value in the equation:
PV = nRT
1.00 atm × 2.50 L = 0.049mol × 0.0821 × T
T = 621.44K
Therefore, the temperature of 0.049 moles of a Ne with a pressure of 1.00 atm and a volume of 2.50 L is 621.44K.
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