In the reaction 4 Cr²⁺(aq) + O₂(g) + 4 H⁺(aq) → 4 Cr³⁺(aq) + 2 H₂O(l), trace amounts of oxygen gas are removed from the mixture. This reaction involves redox processes, where oxidation and reduction occur simultaneously. The correct options are A and B.
A. O₂ (g) is reduced: This statement is true. In the reaction, the oxygen gas (O₂) gains electrons, changing its oxidation state from 0 to -2 (in H₂O). Gaining electrons is the process of reduction.
B. Cr²⁺(aq) is the oxidizing agent: This statement is also true. The oxidizing agent is the substance that causes the reduction of another species. In this case, Cr²⁺ causes the reduction of O₂ by accepting electrons and undergoing a change in its oxidation state from +2 to +3.
C. O₂(g) is the reducing agent: This statement is false. The reducing agent is the substance that causes the oxidation of another species. In this reaction, O₂ is reduced, not the reducing agent. The reducing agent is Cr²⁺, as it loses electrons and causes the oxidation of other species.
D. Electrons are transferred from O₂ to Cr²⁺: This statement is false. Electrons are transferred from Cr²⁺ to O₂. Cr²⁺ loses electrons and gets oxidized to Cr³⁺, while O₂ gains electrons and gets reduced to form H₂O.
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What is the volume of a gas at 20°c
If its orginal volume at 60°C
is 300 cm?
Explanation:
Using Charles law;
V1/T1 = V2/T2
Convert your temperatures to kelvin;
20+273=298k
60+273=333k
Then put the values the formula stated above
300/333 = V2/298
Make V2 the subject of the formula
V2= (300×298)/333
V2= 89400/333
V2= 268.47cm
¿Qué es la ciencia? ¿Qué importancia tiene la ciencia para el desarrollo de la humanidad y de la vida? AYUDA PORFAAAAAAAA
Explanation:
La ciencia puede entenderse como una forma que el ser humano encontró para adquirir conocimientos a través de métodos científicos, tecnológicos y basados en estudios, pruebas e investigaciones y no basados en el pensamiento para explicar los fenómenos humanos, de la naturaleza y de la vida.
La ciencia tiene un rol impactante y transformador en la sociedad, todo el conocimiento adquirido por el hombre a través de la ciencia ha transformado para mejor la vida de las personas, generando mayor calidad de vida, salud, educación, sentido crítico, etc.
En el escenario pandémico que vive el mundo actualmente, la ciencia es fundamental, a través de sus estudios e investigaciones que han ayudado en el desarrollo de vacunas efectivas para inmunizar a los humanos contra el virus y salvar vidas.
Look at the image below:
Pain Reyne
Ben Francia
Les Trans
01 Juan Bautista
Pents
SAN
PEAS FAULT
NORTH AMERICAN PLATE
CIRC PLATE
Carina
What type of plate boundary is shown here?
O convergent
divergent
transform
Answer:
Transform
see image below:
how many grams of fertilizer , for potassium sulfate are there in 42.3 mole of potassium sulfate? step by step
Answer:
The mass of 42.3 moles of potassium sulfate is 7,371.1557 grams
Explanation:
Potassium sulfate K₂SO₄ which is also known as sulphate of potash is a water soluble common component of fertilizer
The molar mass of potassium sulfate, M = 174.259 g/mol
The given number of moles of potassium sulfate, n = 42.3 moles
The mass, 'm', of a given number of moles of potassium sulfate, 'n', is given as follows;
m = n × M
Therefore, we have;
The mass, 'm', of 42.3 moles of potassium sulfate is found by plugging in the values for 'M', and 'n', in the above equation as follows;
m = 42.3 moles × 174.259 g/mol = 7,371.1557 grams
The mass of 42.3 moles of potassium sulfate, m = 7,371.1557 grams.
how can u launch make the model spacecraft move without touching it
Answer:
How can the launcher make the model spacecraft move without even touching it? ...
Magnetic forces can attract or repel objects at a distance. ...
They explore attracting and repelling forces with magnets and with the simulation. ...
Magnetic forces can convert potential energy stored in the magnetic field to kinetic energy.
Explanation:
The launcher can launch the model spacecraft by exerting a magnetic force.
Magnetic force is a force just like gravity that can act across a distance without touching the object that is attracted by it. It should be noted that magnetic attraction is a pulling force.
Therefore, since the launcher wants to make the model spacecraft move without touching it, a magnetic force should be exerted on it. The magnetic force can act as the distance that's required for the objects to move.
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MARKING BRAINLIEST
options: Tempature
solid
melting point
time
condensation point
gas
freezing point
liquid
boiling point
Answer:
I LIKE TRAINS
Explanation:
SNAILS ARE YUMMY
When calcium chloride and baking side is mixed, is it an example of chemical or physical change?
3- Given 90.0 g C6H1206
a- How many moles of Glucose are present in 90.0 g of glucose?
molar mass = 180.18
//
[tex]90.0 \: g \times \frac{1 \: mol}{180.18 \: g} = 0.4995004995 \: mol[/tex]
[tex] = 0.500 \: mol[/tex]
The process by which organisms makes more
organisms like themselves is called
Answer:
Reproduction
Explanation:
Reproduction is the biological process by which new “offspring” (like organisms) are produced from their “parents" (the original organism)
How is wind energy more environmental friendly than heat energy?
Answer:
Wind is an emissions-free source of energy
Overall, using wind to produce energy has fewer effects on the environment than many other energy sources. Wind turbines do not release emissions that can pollute the air or water (with rare exceptions), and they do not require water for cooling.
Explanation:
c) A football feels hard on a hot day but feels softer in the evening
Answer: ^_^
Explanation:
its because during day time the ball becomes heated up and the air inside it try to come out as the heat air always try to go up swelling up the ball,
so in the evening when the air cools down the ball too cools down and air inside it also cools down making the ball feel soft,
Therefore, a football feels hard on a hot day but feels softer in the evening
Hope it helped u,
pls mark as the brainliest
^_^
Answer:
its because during day time the ball becomes heated up and the air inside it try to come out as the heat air always try to go up swelling up the ball,
so in the evening when the air cools down the ball too cools down and air inside it also cools down making the ball feel soft,
Therefore, a football feels hard on a hot day but feels softer in the evening
Hope it helped u,
pls mark as the brainliest
Explanation:
which of the substance changes when it is heated
A . mass
B . volume
C . weight
D . brass
Answer:
mass
Explanation:
Answer:
The answer is C.
Explanation:
If you have absolutely identical objects that have the same weight exactly when they are at the same temperature, then when one object is heated, it will weigh more.
Hope this helps :)
-ilovejiminssi♡
Please help fast, I will give brainliest.
Answer:
B
Explanation:
Which of the following ideas is NOT accepted as true according to today’s atomic theory?
a. Atoms are the basic unit of matter
b. Electrons move in circular
paths around the nucleus
c. Protons, electrons, and neutrons are smaller than the atom
d.The nucleus has charged and uncharged particles
Answer:
D
Explanation:
The melting of metamorphic or igneous rock forms what substance? How? Why?
Answer: Metamorphic rocks form by recrystallization of either igneous or sedimentary rocks,
Explanation:
How many calories of heat are required to raise the temperature of 225g of water from 10.5°C to 43.7°C
How many electrons are transferred when Be and O bond?
02
0
3
4.
Look at picture
ASAP please will mark as brainlist don’t got much time
Answer:
2 electron are transferred when Be and O bond formed
Answer:
2 is the answer:)))))))))
Bill is experimenting with two simple machines. How will he know which
machine is more efficient?
O It will use less force to do the same amount of work.
O It will use more force to do the same amount of work.
O It will be lighter and stronger than the other simple machine.
It will not be possible to tell which simple machine is more efficient.
6) Mr. Collins finally decided to take this seriously and put both hands on the rope and applied a 500 N force to the left,
while Jared and James still struggled with their 300 N force to the right. What is the net force and direction of motion?
Answer:
I'm pretty sure the net force is 200 N and the direction of motion is left
Explanation:
500 - 300 = 200 and more force is coming from and pulling toward the left.
Why are red blood cells red
Red blood cells are red because they contain Haemoglobin
I NEED HELP ASAP, If you help me I’ll give you Brainlist [Calorimetry and specific heat lab]
I don’t know how to calculate the error %
The formula is:
%Error = [I Accepted value-Experimental value I / Experimental value] x 100 can someone please PLEASE help me :(
Answer:
Explanation:
I gave this formula as
What you should get - what you got
--------------------------------------------------- * 100
What you should get
Suppose you are talking about the specific heat of copper and you did a lab and did it fairly well and the specific heat came out to be 0.33
That's what you got, 0.33
What you should get is 0.35 according to the table you've given us.
% error = 0.35 - 0.33
-------------- * 100
0.35
% error = 0.02 * 100/ 0.35
% error = 2/0.35
% error = 5.71
Now here is the really hard part. You have to decide what a positive error is and what a negative error.
A positive error using this formula means you are too low.
A Negative error means that you are too high, just the opposite of what you might think.
Can you show us the experimental value?
So basically, the accepted value would be under the Specific heat capacity of metal (e.g. 0.90, 0.35, 0.44, 0.12).
Your experimental value would be the specific heat capacity that you got from the lab.
You would first substract the experimental value from the accepted value
[tex]accepted \: value - experimental \: value [/tex]
and then you would divide the result by the experimental value
[tex]result \div experimental \: value[/tex]
and then, you would multiply the result of that by a hundred to get your percentage
[tex]result \times 100 = \% \: error[/tex]
//
The image shown is an example.
0.90 is our accepted value.
0.88 is our experimental value.
The overall percentage error I got is %2.27
what is biopolymer ?
Answer:
Biopolymers are natural polymers produced by the cells of living organisms. Biopolymers consist of monomeric units that are covalently bonded to form larger molecules. There are three main classes of biopolymers, classified according to the monomers used and the structure of the biopolymer formed: polynucleotides, polypeptides, and polysaccharides.
Explanation:
The F1-ion is classified as a(n).
and has:
A.anion, 1 valence electron
B.anion, 8 valence electrons
C.cation, 2 valence electrons
D.cation, O valence electrons
Answer:
B
Explanation:
The [tex]\rm \bold{F^1^-}[/tex] is the fluorine anion with 8 valence electrons. Hence, option B is correct.
An ion is defined as the atom with the change in the valence electrons by the loss or gain of electrons to complete the outer shell.
What type of ion is [tex]\rm F^1^-[/tex]?The ions with the gain of electrons result in a negative charge and are termed anions. The ions with a loss of electrons have a positive charge and are termed cations.
The F is the halogen atom of group 17 with 7 valence electrons. The ion formed for F requires 1 electron to complete its valence shell.
The ion [tex]\rm F^1^-[/tex] has a negative charge, which denotes it gains an electron and forms anion.
The gain of electrons results in the number of valence electrons being 8.
Thus, [tex]\rm F^1^-[/tex] is the fluorine anion with 8 valence electrons. Hence, option B is correct.
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HELP ASAP PLS AHHH ty
Answer: a for the first one , d for the second one, b for the third one.
Explanation:
Answer:
A: Main sequence star.
B: White Dwarf.
C: Black hole.
Explanation:
Brainliest please.
What does the reaction rate measure?
Answer:
It's C
Explanation:
cuz im goated
A permanent alteration in the DNA sequence that makes up a gene is called am
Mutation
Germline
Meiosis
Evolution
Answer:
Gene mutation
Explanation:
A gene mutation is a permanent alteration in the DNA sequence that makes up a gene, such that the sequence differs from what is found in most people. Mutations range in size; they can affect anywhere from a single DNA building block base pair to a large segment of a chromosome that includes multiple genes
Identify this reaction.
NH3 + H2SO4 → (NH4)2SO4
O decomposition
O synthesis
O double displacement
O single displacement
Answer: synthesis
Explanation:
Answer:
Synthesis
Explanation:
Two compounds combine to produce one compound
What is the most basic level of biological organization?
Question 1 options:
Organism
Cell
Molecule
Atom
Answer:
molecule
Explanation:
Answer:
c
Explanation:
When talking about the products of photosynthesis, why is it a HUGE issue when a vast amount of the rainforests is dying along with vast amounts of forests from fires/deforestation? Remember, we know that this hurts the ecosystems of animals living there, but what else does it effect?
Question 5 options:
the creation of oxygen
the creation of too much smoke
the creation of carbon monoxide
the creation of carbon dioxide
Answer:
the creation of oxygen.
Explanation:
Se queman 87,0 g de butano con oxígeno produciéndose dióxido de carbono y agua. Calcular la masa de oxígeno necesaria y la masa de dióxido de carbono y de agua que se desprenderá
Answer:
312g O₂ son necesarios, se producen 264g CO₂ y 135g H₂O
Explanation:
La combustión de butano para producir CO₂ y H₂O ocurre así:
C₄H₁₀ + 13/2O₂ → 4CO₂ + 5H₂O
Donde 1 mol de butano reacciona con 13 moles de oxígeno para producir 4 moles de dióxido de carbono y 5 moles de agua.
Para resolver este problema debemos convertir la masa de butano a moles y, usando la reacción balanceada, obtener cuánto se necesita de oxígeno y cuánto se produciría de dióxido de carbono y agua:
Moles butano -Masa molar: 58.12g/mol-:
87.0g * (1mol / 58.12g) = 1.50 moles
Moles y masa de oxígeno necesarias para la reacción -Masa molar: 32g/mol-:
1.50 moles C₄H₁₀ * (13/2 moles O₂ / 1 mol C₄H₁₀) = 9.75 moles * (32g/mol) =
312g O₂ son necesarios
Moles y masa de dióxido de carbono producidas -Masa molar: 44.01g/mol-:
1.50 moles C₄H₁₀ * (4 moles CO₂ / 1 mol C₄H₁₀) = 6 moles * (44.01g/mol) =
264g CO₂ se producen
Moles y masa de agua producidas -Masa molar: 18.015g/mol-:
1.50 moles C₄H₁₀ * (5 moles H₂O / 1 mol C₄H₁₀) = 7.5 moles * (18.015g/mol) =
135g H₂O se producen