Answer:
C&D all living things are composed of cells
The basic unit of life is a cell
Question 1 (2 points) What are the three subatomic particles that make up an atom? Question 1 options: Nucleus, Electrons & Protons Protons, Electrons & Neutrons Protons, Neutrons & Nucleus Question 2 (1 point) Inside of the nucleus there are protons and neutrons. Question 2 options: True False Question 3 (1 point) Which statement below is true? Question 3 options: Neutrons are positive, Protons are negative, and Electrons are neutral Electrons are positive, Neutrons are negative, and Protons are neutral Protons are positive, Electrons are negative, and Neutrons are neutral Question 4 (1 point) The atomic number can tell us how many neutrons are in an atom. Question 4 options: True False Question 5 (2 points) The mass number is equal to which of the following? Question 5 options: Protons + Neutrons Protons + Atomic Number Neutrons + Electrons Protons - Neutrons Question 6 (1 point) In order to calculate how many neutrons are in an atom, you must subtract the mass number from the number of protons? Neutrons = Mass # - Protons Question 6 options: True False Question 7 (2 points) If I have an element with a mass of 56 and it has 26 protons, how many neutrons does it have? Question 7 options: 26 56 30 82 Question 8 (1 point) Isotopes are atoms with the SAME number of protons, but DIFFERENT numbers of neutrons. Question 8 options: True False Question 9 (3 points) Please have your periodic table of elements. An atom has 8 protons and 9 neutrons what is the chemical symbol for this isotope? Question 9 options: Flourine F-17 Oxygen O-17 Question 10 (2 points) How many protons and neutrons does iron-56 have? Question 10 options: 26 protons and 56 neutrons 26 protons and 26 neutrons 30 protons and 56 neutrons 26 protons and 30 neutrons
Answer:
1. electrons and neutrons protons
2. true
3. electrons are negative and neutrons are neutral
4. true
5. the total number of neutrons and protons
Explanation:
What is the density of an object that has a mass of 6.5 g and when placed in water displaces the volume from 4.5mL to 11.8mL? round to the nearest tenth
Answer:
[tex]\rho =0.9g/mL[/tex]
Explanation:
Hello,
In this case, due to the volume displacement caused the by the object's submersion, it's volume is:
[tex]V=11.8mL-4.5mL=7.3 mL[/tex]
In such a way, considering the mathematical definition of density, it turns out:
[tex]\rho =\frac{m}{V}=\frac{6.5g}{7.3mL}\\ \\\rho =0.89g/mL[/tex]
Rounding to the nearest tenth we finally obtain:
[tex]\rho =0.9g/mL[/tex]
Regards.
Glve the number of significant figures: 13,436.0 mm
Significant figures:
Answer: 6
Explanation: Because there is a decimal point, the zero after is included. The first 5 numbers are significant because they aren’t zero. Zeros are included if there is a decimal point (13.0, 160.0) or are in the middle of a number (16007, 101). They are not included if they are before a decimal (000.0081, 0.000021)-(there are only 2 sig figs in these: the actual numbers) or after a number without a decimal (15840000, 100)-(all the zeros in these numbers are not significant).
Blue light waves have more energy than red light waves. Which of these situations most likely produces a photoelectric effect? You may assume that the same metal is used in each situation.
Answer:
You may assume that the same metal is used in each situation. Light is emitted by electrons when they drop from one energy level to a lower level.
The molar mass of CsF is 151.9 g/mol. How many grams of CsF are needed to prepare 300.0 mL of 0.0500 M CsF solution?
Answer:
2.28 g of CsF.
Explanation:
The following data were obtained from the question:
Molar mass of CsF = 151.9 g/mol.
Volume = 300 mL
Molarity of CsF = 0.05 M
Mass of CsF =.?
Next, we shall convert 300 mL to litre (L). This can be obtained as follow:
1000 mL = 1 L
Therefore,
300 mL = 300 mL /1000 mL × 1 L
300 mL = 0.3 L
Therefore, 300 mL is equivalent to 0.3 L
Next, we shall determine the number of mole CsF in the solution. This can be obtained as follow:
Volume = 0.3 L
Molarity of CsF = 0.05 M
Mole of CsF =.?
Molarity = mole /Volume
0.05 = mole of CsF /0.3
Cross multiply
Mole of CsF = 0.05 × 0.3
Mole of CsF = 0.015 mole.
Finally, we shall determine the mass of CsF needed to prepare the solution as follow:
Mole of CsF = 0.015 mole.
Molar mass of CsF = 151.9 g/mol.
Mass of CsF =.?
Mole = mass /Molar mass
0.015 = mass of CsF /151.9
Cross multiply
Mass of CsF = 0.015 × 151.9
Mass of CsF = 2.28 g
Therefore, 2.28 g of CsF is needed to prepare the solution.
What is chemistry?
A. The scientific study of matter
B. The study of living things
C. The study of how matter and energy interact
D. The study of changing ideas
Answer:
the scientific study of matter i believe
Explanation:
because the definition says the branch of science that deals with the identification of the substances of which matter is composed
A block of wood has a volume of 64 cm3 and a mass of 46 grams. What is the density of the block?
g
0 2944
cm3
g
1.0
cm3
g
o 1.4
cm3
O 0.72
g
cm3
A Moving to another question will save this response.
The correct answer is 0.72 g/cm3
Explanation:
The density of a material depends on both its mass (amount of matter), which is usually provided in grams (g), and its volume (space occupied), which is provided in units such as cubic centimeters cm3. Moreover, to find how dense the material is, take the mass and divide it into the volume. The process for finding the density of the block of wood is shown below:
[tex]d = \frac{m}{v}[/tex]
[tex]d = \frac{46 g}{64 cm3}[/tex]
[tex]d = 0.718 g/cm3[/tex]
This means the density is 0.71g/cm3 and this can be rounded to 0.72 g/cm3
The mass number is equal to which of the following? Question 5 options: Protons + Neutrons Protons + Atomic Number Neutrons + Electrons Protons - Neutrons
Answer: The mass number is the sum of the numbers of protons and neutrons present in the nucleus of an atom.
I hope that this helps you !
which of the following is NOT a chemical property?
Conductivity
Malleability
Reactivity
Freezing
Answer:
Malleability
Explanation:
Answer:
Malleability is not chemical property
The atomic mass of fluorine is 19.00 amu, and all fluorine atoms in a naturally occurring sample of fluorine have this mass. The atomic mass of chlorine is 35.45 amu, but no chlorine atoms in a naturally occurring sample of chlorine have this mass Provide an explanation for the difference. Check alt that apply
A. Fluorine has three isotopes with atomic masses 18.00 amu, 19.00 amu and 20.00 amu, and their appearance in nature is equal, while the appearance of chlorine is not equal.
B. Chlorine has more than one stable isotope that occurs naturally.
C. Chlorine does not exist as an elemental part, there is chlorine gas with two different chlorine atoms that results the atomic mass 35.45 amu.
D. As fluorine only has one isotope the atomic mass is identical to the mass of the isotope.
Answer:
B. Chlorine has more than one stable isotope that occurs naturally.
D. As fluorine only has one isotope the atomic mass is identical to the mass of the isotope.
Explanation:
The reason for the difference seen between the atomic mass provided in the periodic table and the atomic mass of each element is that most naturally occurring elements have more than one isotope (isotopes are atoms that have the same atomic number but different mass numbers). This means that when we measure the atomic mass of an element, we must generally settle for the average mass of the naturally occurring mixture of isotopes.
¹⁹F is the only stable isotope of fluorine, and its abundance is 100%. Therefore, its atomic mass is identical to that of the isotope.
On the other hand, chlorine has two stable isotopes ³⁵Cl (75.77%) and ³⁷Cl (24.23%). The atomic mass of ³⁵Cl has been determined to be 34.96885 amu, and the atomic mass of ³⁷Cl has been determined to be 36.96590 amu. Thus, the average atomic mass of chlorine can be calculated as follows:
average atomic mass of natural chlorine = (0.7577)×(34.96885 amu) + (0.2423)×(36.96590 amu) = 35.45 amu
Note that in calculations involving percentages, we need to convert percentages to fractions.
Use a volumetric flask to prepare 100.00 mL of 0.70M HCl solution. Do this by diluting either one of the stock hydrochloric acid solutions that have been set out for you to use (the stock solutions are 3.0M and 6.0M HCl). (WARNING! Concentrated HCl is caustic and will cause burns. Handle carefully.) Dispose of any excess HCl in the waste container.
Answer:
- Take 3.3 mL of 3.0-M hydrochloric acid and subsequently add 76.7 mL of water to complete the 100.00 mL.
- Take 11.7mL of 6.0-M hydrochloric acid and subsequently add 88.3 mL of water to complete the 100.00 mL
Explanation:
Hello,
In this case, given that the dilutions are preparedfrom 3.0-M and 6.0-M hydrochloric acid, we must proceed as follows:
- 3.0-M stock: when using this stock, the aliquot you must take is computed as shown below:
[tex]V_1=\frac{M_2V_2}{M_1}=\frac{100.00mL*0.70M}{3.0M}=23.3mL[/tex]
It means that you must take 23.3 mL of 3.0-M hydrochloric acid and subsequently add 76.7 mL of water to complete the 100.00 mL.
- 6.0-M stock: when using this stock, the aliquot you must take is computed as shown below:
[tex]V_1=\frac{M_2V_2}{M_1}=\frac{100.00mL*0.70M}{6.0M}=11.7mL[/tex]
It means that you must take 11.7mL of 6.0-M hydrochloric acid and subsequently add 88.3 mL of water to complete the 100.00 mL.
Regards.
Explain the significance of:_______. a) a very large value of K, b) a very small value of K, and c) a K value of about 1.0.
Answer:
See explanation
Explanation:
a) A large value of K shows that the reaction is product favoured. It implies that more reactants are converted to products and the equilibrium concentration of products in the system is far higher than that of the reactants. The reaction will proceed towards the right hand side.
b)A small value of K implies that the reaction is reactant favoured. There are more reactants than products present at equilibrium and the reaction will proceed towards the lefthand side.
c) K=1 implies the presence of a significant concentration of reactants and products in the system at equilibrium.
if a=b, what is the numerical value of the quantity a/b?
Answer:
The numeric value is 1.
Explanation:
We have given that the “a” equal to “b” which means we can replace the “a” with “b” or we can replace the “b” with “a”.
The given condition or quantity = a/b.
Now it is required to find the numeric value of a/b.
To find the numeric value we first replace the “b” with “a” and then divide the values. Since we know that if the numeration and denominators are the same then after dividing the value, the resulting value will be 1.
The numerical value = a/b = a/a = 1
Which of these mixtures are heterogeneous? a. oil and water b. salt and water c. brass (an alloy of copper and zinc) d. granite
The mixture that has been heterogeneous has been oil and water. Thus, option A is correct.
The mixture has been defined as the combination of two or more substances. The mixture has been categorized as pure and heterogeneous mixture based on the solubility of the constituents.
Heterogeneous mixtureThe pure mixture has been defined as the one in which the constituent substances are completely soluble, and are not visible with the bare eyes.
The heterogeneous mixture has been defined as the combination in which the constituents elements are not completely soluble and are easily differentiated from each other by physical means.
The mixture of oil and water has been a heterogeneous mixture, as the two liquids are immiscible and can be separated based on density.The salt and water is a pure mixture, as the two are completely soluble, and they can not be distinguished easily in the solution.The brass is the pure mixture as they have properties different from the constituent elements and has been completely miscible form.The granite has been a compound of carbon. It has been the mixture of carbon atoms in the specified arrangement, thereby is a pure form.Thus, the mixture that has been heterogeneous has been oil and water. Thus, option A is correct.
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A silicon atom has an atomic number of 14. What information does the atomic number tell you? (Choose all possible answers)
Group of answer choices
Silicon atoms have 14 protons.
Silicon atoms will react with other atoms in order to gain stability.
Silicon atoms are stable in their elemental form
Silicon atoms have 14 electrons.
Answer:
Silicon atoms have 14 protons.
Silicon atoms will react with other atoms in order to gain stability.
Silicon atoms have 14 electrons.
Katrina is investigating the properties of volume for the different states of matter. First, she places a cube in a bowl of water and observes what happens. Next, she takes the cube out of the water and pours the water into a glass. Which statement describes the observations Katrina made? A. When the cube was placed in the water, the volume and shape stayed the same. When the liquid was poured from the bowl, the shape changed. B. When the cube was placed in the water, the volume of the water changed. When the liquid was poured from the bowl, the shape changed. C. The volume of the cube and the water changed when the cube was placed into the water. The volume of the liquid changed when it was poured out of the bowl. D. The shape and volume of the cube and the liquid changed when the cube was placed in the bowl. The liquid stayed the same when it was poured from the bowl.
Answer:
When the cube was placed in the water, the volume of the water changed. When the liquid was poured from the bowl, the shape changed.
Explanation:
When a cube is placed inside water, the volume of the water will change due to the introduction of the cube as the cube will displace some water. Remember that the shape of a liquid is the shape of its container so the shape of the water remains the same.
When the water is poured into a glass, its shape changes as it now assumes the shape of the glass as explained above.
Answer: When the cube was placed in the water, the shape of the cube stays the same. When the liquid was poured from the bowl into the glass, the shape changed
Explanation:
Three blocks of the same mass are placed in front of you. Block A has a volume of
3.0 cm", block B of 5.0 cm', and block C of 10.0 cm. Which has the higher
density?
Given :
Three block of same mass name A , B and C .
Sides of block A , B and C is 3.0 cm , 5.0 cm and 10.0 cm .
To Find :
Which block has the higher density .
Solution :
We know , density [tex]\rho[/tex] is given by :
[tex]\rho=\dfrac{M}{V}[/tex] ......1 )
Here , V is volume .
Now , volume V for cube is given :
[tex]V=a^3[/tex] .......2 )
( Here , a is the side of cube )
Now ,form equation 1 we can see if mass remains constant then density decrease with increase in volume.
Therefore , cube with minimum side will have higher density , in this case it is 3 cm block .
Hence , this is the required solution .
What are the intermolecular forces between molecules in a liquid sample of sulfur trioxide,SO3?a. hydrogen bonding b. dipole-dipole interactions c. dispersion forces
Answer:
dispersion forces
Explanation:
SO3 is a trigonal planar molecule. All the dipoles of the S-O bonds cancel out making the molecule to be a nonpolar molecule.
The primary intermolecular force in nonpolar molecules is the London dispersion forces. As expected, the London dispersion forces is the intermolecular force present in SO3.
Hence SO3 is a symmetrical molecule having only weak dispersion forces acting between its molecules.
The intermolecular bond in the sulfur trioxide has been the dispersive force. Thus, option C is correct.
The sulfur trioxide has been the nonpolar molecule with the presence of S-O and S=O bonds.
The nonpolar bonds have consisted of weak intermolecular interactions resulting from the London Dispersive force. This type of interaction has been able to bind the nonpolar molecules together.
Thus, the intermolecular bond in the sulfur trioxide has been the dispersive force. Thus, option C is correct.
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What is the role of the greenhouse gases in the atmosphere?
Answer:
greenhouse effects are molecules that trap heat on earth atmosphere
Answer:
play an important role in Earth's climate.
Explanation:
Greenhouse gases are certain molecules in the air that have the ability to trap heat in the Earth's atmosphere. Some greenhouse gases, like carbon dioxide (CO2) and methane (CH4), occur naturally and play an important role in Earth's climate. If they didn't exist, the planet would be a much colder place.
A square table has an area of 400 square feet. They want to cut the table into two equal rectangles. If they cut the table in half, vertically, what would be the dimensions of the rectangular table?
Answer:
b=200
l=100
Explanation:
so since it is a square all sides would be equal
when you cut the square vertically the dimensions will change
the bredth would be same that is 200
but the length would be half that is 100
True or False? If a substance is mixed with another substance and then the result is a new odor, then is reaction is a physical reaction.
Answer:
True
Explanation:
In a chemical reaction, there's usually something to do with the composition of the substance. In a physical reaction, the effect could have something to do with appearance or smell.
Hope this helps!
If you burn yourself in lab you should?
A. See the nurse after class
B. Tell the instructor
C. See a doctor after school
D. Apply first aid yourself
Answer:
B. Tell the instructor
Explanation:
Always to the instructor about any accidents happens in a lab.
Answer:
B
Explanation:
Just helping out:)
An experiment looking at structures smaller than a cell would most likely employ a
1) dissecting microscope
B) transmission electron microscope
3) scanning electron microscope
D) compound light microscope
Answer:
The correct answer is - b. transmission electron microscope.
Explanation:
A transmission electron magnifying instrument fires a light emission through an sample to create an amplified and magnified picture of a specimen.
The transmission electron magnifying instrument is utilized to see thin slices of specimen or specimen smaller than 100 nm through which electrons can pass and form a image of specimen. The TEM is comparable to from various perspectives to the ordinary light magnifying instrument.
Thus, the correct answer is - b. transmission electron microscope.
chemistry screen shot below plzzzzzzz help i've been stuck forever
Answer:
True
Explanation: Imagine the Electrons is by the nucleus which give more energy.
What is the density of a copper blocks if it has a mass of 43.5 grams and a volume of 4.85 cm^3?
The complementary base sequence to GTAGCT is:_______.A) CATCGA.B) ACGATC.C) GCAGTA.D) AGTCGA.E) None of the above
Answer:none of the above
Explanation:
The complementary base sequence to GTAGCT is C-A-T-G. Therefore, option E is correct.
What is complementary base sequence ?If the base sequence of the other strand is known, complementary base pairs allow the sequence of one strand to be predicted. In DNA, complementary base pairing is crucial because it enables the base pairs to be put in the most energetically advantageous configuration.
Reverse transcriptase, a DNA polymerase that can use either DNA or RNA as a template, creates complementary DNA (cDNA), a DNA copy of a messenger RNA (mRNA) molecule.
The nitrogenous bases' adenine, thymine, cytosine, and guanine are referred to as complementary base pairs. Adenine will always pair with its complementary base, thymine, and cytosine will always couple with its complementary base, guanine, in a double strand of DNA.
Thus, option E is correct.
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(The radioisotope 224Ra decays by alpha emission via two paths to the ground state of its daughter 94% probability of alpha decay directly to the daughter ground state;(20 pts, 5 pts each)5.5% probability of alpha decay to an excited state before emitting a 0.241 MeV photon in an isomeric transition to reach the ground state of the daughter.a.Write the reaction equation for the alpha decay of 224Ra. b.Calculate the Q-value (in MeV) of this reaction. c.What are the energies (in MeV) of the two associated alpha particles? d.Sketch the decay scheme for the decay of 224Ra with the associated probabilities, energies, and emissions for the a
Answer:
a) ²²⁴Ra₈₈ ---> α + ²²⁰Rn₈₆ + Q
b) the Q-value of this reaction is 5.789 MeV
c) the energies (in MeV) of the two associated alpha particles are; 5.69 MeV and 5.449 Mev
Explanation:
a)
The decay equation for the alpha decay is expressed as;
²²⁴Ra₈₈ ---> α + ²²⁰Rn₈₆ + Q
b)
Calculate the Q-value (in MeV) of this reaction.
Q = Mparent - Mdaughter -Mg
Q = MRa - MRn -Mg
= 224.020202 - 220.011384 - 4.00260305
= 0.00621495 amu
= 5.789 MeV
therefore the Q-value of this reaction is 5.789 MeV
c)
Energy of alpha particle is expressed as;
E∝ = MQ / ( m + M)
now this is the maximum energy available for the daughter, ²²⁰Rn going to the ground state;
The energy of the alpha particle gives;
E∝ = 220(5.789) / ( 4 + 220) = 5.69 MeV
as given in the question,The other less frequent alpha occurring 5.5% of the time leaves the daughter nucleus in an excited state of 0.241 MeV above the ground state.
Therefore the energy of this alpha is
E∝ = 5.69 - 0.241 = 5.449 Mev
Therefore the energies (in MeV) of the two associated alpha particles are; 5.69 MeV and 5.449 Mev
d)
Sketch of the nuclear decay scheme have been uploaded along side this answer.
(a)[tex]^{224}Ra_{_{88}}=^4\alpha_{_2}+^{220}Rn_{_{86}}+Q[/tex]
(b) the Q-value of the reaction is 5.789 MeV
(c) The alpha particles have energies of 5.69 MeV and 5.449 MeV
Alpha decay:(a) The alpha decay of the radioisotope 224Ra is given by:
[tex]^{224}Ra_{_{88}}=^4\alpha_{_2}+^{220}Rn_{_{86}}+Q[/tex]
(b) The Q-value of a reaction is given by:
Q = {mas of reactants - mass of products}c²
[tex]Q = [M_{224Ra} - M_{\alpha} - M_{220Rn}]c^2[/tex]
Q = (224.020202 - 220.011384 - 4.00260305) amu.c²
Q = 0.00621495 × 931.5 MeV ( since 1 amu.c² = 931.5 MeV)
Q = 5.789 MeV
(c) The energy of the alpha particle is expressed as;
E(α) = MQ / ( m + M)
it is the maximum energy available for the daughter nucleus, ²²⁰Rn going to the ground state.
If the daughter nucleus is at rest then all the energy is carried by the alpha particle.
The energy of the alpha particle is:
E(α) = 220(5.789) / ( 4 + 220) = 5.69 MeV
Now, for the alpha particle occurring 5.5% of the time and leaving the daughter nucleus in an excited state of 0.241 MeV :
The energy of this alpha particle is
E(α) = 5.69 - 0.241 = 5.449 Mev
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What is the name of the binary molecule H2O2? This compound is also known as hydrogen peroxide and is a properly disinfectant or cuts and scrapes.
Answer:
hydrogen dioxide
Explanation:
Hydrogen dioxide is the name of the binary molecule H2O2 ,therefore option (b) is correct from the image below.
What do you mean by hydrogen dioxide ?A thick, colorless liquid, H2O2, resembling water, but having a bitter, sour taste, produced by the action of acids on barium peroxide.
It decomposes into water and oxygen, and is manufactured in large quantities for an oxidizing and bleaching agent. Called also oxygenated water.
A colorless, unstable compound of hydrogen and oxygen (H 2 O 2). It is used as an antiseptic and bleaching agent.
Hydrogen dioxide is the name of the binary molecule H2O2 ,hence option (b) is correct from the image below.
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A student obtains a clean, dry graduated cylinder. She weighs the cylinder and finds the mass to be 32.64 g. She then fills the cylinder with a certain volume of water. She weighs the water-filled cylinder and finds the total mass to be 61.57 g. If the density of the water in the laboratory is 0.9975 g / mL , what is the volume of the water in the graduated cylinder?
Answer:
Explanation:
A student obtains a clean, dry graduated cylinder. She weighs the cylinder and finds the mass to be 32.64 g. She then fills the cylinder with a certain volume of water. She weighs the water-filled cylinder and finds the total mass to be 61.57 g. If the density of the water in the laboratory is 0.9975 g / mL , what is the volume of the water in the graduated cylinder?
Answer:
Volume of water =29.00mL
Explanation:
mass of cylinder (Mc)=32.64g
mass of water-filled cylinder (Mw+c)=61.57g
mass of water (Mw)= (Mw+c) - (Mc).
=(61.57 - 32.64)g = 28.93g
However:
Density = mass÷volume
hence Volume of water = mass of water÷density of water.
28.93g÷0.9975g/mL = 29.00mL
Which species is oxidized in the following reaction? CO2 + H2 → CO + H2O A. H B. CO2 C. C D. O
it should be option A. H
[ because H gained oxygen ( O ) ]
Oxidation is defined by :
- the loss of electrons
- the loss of hydrogen ( H )
- the gain of oxygen ( O )
- increase in oxidation state
Reduction is defined by :
- the gain of electrons
- the gain of hydrogen ( H )
- the loss of oxygen ( O )
- decrease in oxidation state
(Basically, oxidation n reduction is opposite of each other)
The species being oxidized in the following reaction is Carbon Dioxide (CO2). This can be determined by looking at the oxidation states of the reactants and products.
What happens in case of reactants ?In the reactants, Carbon Dioxide (CO2) has an oxidation state of +4, while Hydrogen (H2) has an oxidation state of 0. In the products, Carbon (CO) has an oxidation state of +2, and Water (H2O) has an oxidation state of -2.
The net change in oxidation states between the reactants and products is a decrease of 6, which means that the species that was being oxidized is Carbon Dioxide (CO2). The oxidation state of a species can be determined by looking at the number of electrons it has gained or lost in a reaction.
In this reaction, Carbon Dioxide (CO2) has lost 6 electrons, which is a sign that it is the species being oxidized. This is further evidenced by the fact that Carbon (CO) and Water (H2O) have gained electrons, meaning that they are the species being reduced. Therefore, the species being oxidized in the following reaction is Carbon Dioxide (CO2).
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