Answer: a. +2, cation and magnesium ion .
b. -1, anion, chloride
c. -2, anion, oxide
d. +1. cation , potassium ion
Explanation:
When an atom accepts an electron negative charge is created on atom and is called as anion.
When atom loses an electron positive charge is created on atom and is called as cation.
Magnesium (Mg) with atomic number of 12 has electronic configuration of 2,8,2 and thus it can lose 2 electrons to form [tex]Mg^{2+}[/tex] cation and becomes magnesium ion.
Chlorine (Cl) with atomic number of 17 has electronic configuration of 2,8,7 and thus it can gain 1 electron to form [tex]Cl^{-}[/tex] anion and becomes chloride.
Oxygen (O) with atomic number of 8 has electronic configuration of 2,6 and thus it can gain 2 electrons to form [tex]O^{2-}[/tex] anion and becomes oxide.
Potassium (K) with atomic number of 19 has electronic configuration of 2,8,8,1 and thus it can lose 1 electron to form [tex]K^{+}[/tex] cation and becomes potassium ion.
CH3CH2OH and CH3CHO
Which is more acidic??
Answer:
CH3CH2OH
Explanation:
CH3CH2OH the ethanol is regarded as neutral since pH is very close to 7 and CH3CHO or acetaldehyde is an extremely weak basic max pH of 8.
How many moles of Chromium is in 4.41 ×10^24 atoms
7.32 moles of Chromium is present in 4.41 × 10²⁴ atoms.
How to find the number of moles ?Number of moles = [tex]\frac{\text{Given number of atoms}}{\text{Avogadro's Number}}[/tex]
What is Avogadro's Number ?
Avogadro's number is the number of particles in one mole of substance. 6.022 × 10²³ is known as Avogadro's Constant / Avogadro's Number.
Avogadro's Number = 6.022 × 10²³
Now put the values in above formula we get
Number of moles = [tex]\frac{\text{Given number of atoms}}{\text{Avogadro's Number}}[/tex]
= [tex]\frac{4.41 \times 10^{24}}{6.022 \times 10^{23}}[/tex]
= 7.32 moles
Thus from the above conclusion we can say that 7.32 moles of Chromium is present in 4.41 × 10²⁴ atoms.
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What color does red cabbage juice make when mixed with a citrus cleaner?
Answer: PINK
Explanation:
What is the generic name of this molecule? (Ph stands for phenyl)
The proper name of the compound is now 1,1 - dihydroxy-3-phenyl propene.
What is the name of the compound?Firstly we know that the parent chain is based on propane. Now we have three substituents on that parent chain. Two hydroxy moieties and one phenyl moiety.
The proper name of the compound is now 1,1 - dihydroxy-3-phenyl propene.
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I need to know the number of each atom
60cm³ of hydrogen are sparked with 20cm³ of oxygen at 100°c and 1 atmosphere. The total volume of the residual gasses is?
Answer:
Options
*A) 60 cm3 = Correct.* This is the answer
B) 10 cm3
C) 40 cm3
D) 30 cm3
E) 70 cm3
Explanation:
what is the Thermodynamics of leaching of ilmenite in hydrochloric acid for titania pigment production?
The thermodynamics of leaching of ilmenite in hydrochloric acid for titania pigment production is an industrial production of nano-sized titanium dioxide (TiO2).
What is thermodynamics?Thermodynamics is defined as the change in the energy of system that brings about work in that system.
The leaching of ilmenite which is a titanium-iron oxide mineral with HCl can lead to the production of titanium dioxide (TiO2).
The use of thermodynamics in this process controls the heat and energy of the leaching system leading to a better yield of final products.
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Predict the products of the double replacement reactions given. Check to see that the equations are
balanced.
AgNO3 + NaCl → ?
O AgNa+CINO3
NaNO3 + AgCl (s)
O 2NaNO3 + 3AgCl (s)
O Ag + NaNO3
Answer:
Option (2)
Explanation:
The two compounds formed will be AgCl and NaNO₃.
We can see that this will result in a balanced equation, so the answer is Option (2).
Answer:
B) NaNO3 + AgCl (s)
Explanation:
edge 2023
A hazard is ________. An example of a hazard is ____.
According to the research, a hazard is the real possibility that we will suffer some harm. An example of a hazard is free toxic gases.
What is a hazard?It is associated with situations that have potentially harmful effects on the body, the environment or property.
In chemistry, it is understood as those conditions of potential health damage caused by uncontrolled exposure to chemical agents of various kinds, such as the release of toxic and flammable gases such as ethanol.
Therefore, we can conclude that according to the research, a hazard is the real possibility that we will suffer some harm. An example of a hazard is free toxic gases.
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can someone please fill this out for me
Filling out the table of elements below following the outlined order:
Calcium - symbol = Ca; Group =2; Period = 4; Ar = 134; Am =40.078u; Ph = solid; Density = 1.55; Bp = 1757K; Mp = 1115K.Vanadium - symbol = V; Group =5; Period = 4; Ar = 197; Am =50.9415u; Ph = solid; Density = 6.11; Bp = 3680K; Mp = 2183K.Manganese - symbol = Mn; Group =7; Period = 4; Ar = 127; Am = 54.938044u; Ph = solid; Density = 7.21; Bp = 2334K; Mp = 1519K.Cobalt: - symbol = Co; Group =9; Period = 4; Ar = 125; Am =58.933195 u; Ph = solid; Density = 8.90; Bp = 3200K; Mp = 1768K.Zinc: - symbol = Zn; Group = 12; Period = 4; Ar = 134; Am =65.38 u; Ph = solid; Density = 7.14; Bp = 1180K; Mp = 692.68K.Arsenic: - symbol = As; Group = 15; Period = 4; Ar = 197; Am = 74.9216 u; Ph = solid; Density = 5.75; Bp = 889K; Mp = 889K.Bromine: - symbol = Br; Group =17; Period = 4; Ar = 120; Am = 79.904 u; Ph = Liquid; Density = 3.1028; Bp = 332K; Mp = 265K.Meaning of ElementAn element can be defined as a substance that can not be broken down into simpler substances.
An element serves as a building blocks for compounds and mixtures.
In conclusion, each element and its property as requested in the table are given above.
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Perform the following operation
and express the answer in
scientific notation.
6.0×103-2.3×103
[?]x10[?]
Answer:
6.0 x 10³ - 2.3 x 10³ = 3700
3700 ---------> 3.7 x 10³
It takes 50.0 J to raise the temperature of an 10.6 g piece of unknown metal from 13.0°C to 24.9 °C.
What is the specific heat for the metal?
Express your answer with the appropriate units.
Answer:
0.396 J/g°C (to 3 sf)
Explanation:
50.0 = 10.6(24.9-13.0)(c)
c = 0.396 J/g°C (to 3 sf)
Put the following energy sublevels in order from least to greatest energy.
A. 1s, 2s, 3s, 4s, 2p, 3p, 4p, 3d, 4d, 4f
B. 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 4d, 4f
C. 1s, 2s, 2p, 3s, 3p, 3d, 4s, 4p, 4d, 4f
D. None of these
The correct order is 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 4d, 4f. The correct option is B.
Order of energy sublevelsThe correct order of energy sublevel is 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p.
Thus, with the exclusion of 5s, 5p, 6s, 5d, 6p, 7s, 5f, 6d, and 7p, what we have left in order of increasing energy is 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 4d, 4f.
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The correct order from least to greatest energy for the energy sublevels is; 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 4d, 4f (Option B).
What is the Aufbau principle?The Aufbau principle offers a method in which the energy levels in an atoms are arranged from the least to the greatest. We know that electrons are filled into orbitals in order of increasing energy.
Thus, the correct order from least to greatest energy for the energy sublevels is; 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 4d, 4f (Option B).
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Calculate the percent yield of a reaction that produced 0.350 mol HCI if the theoretical yield was 15.36 g
The percent yield of the reaction that produced 0.350 mol HCI is 83.17%
How to determine the actual yield (in grams)Mole of HCl = 0.350 moleMolar mass of HCl = 36.5 g/molActual yield =?Actual yield = 0.35 × 36.5
Actual yield = 12.775 g
How to determine the percentage yield Actual yield of HCl = 12.775 gTheoretical yield of HCl = 15.36 gPercentage yield =?Percentage yield = (Actual / Theoretical) × 100
Percentage yield = (12.775 / 15.36) ×100
Percentage yield = 83.17%
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What makes yogurt a colloid? What kind of a colloid is yogurt?
Answer:
Explanation:
yogurt is a colloid because of the milk/dairy in it. yogurt is a complex colloid.
As yogurt includes living bacterial cultures, proteins, lipids, and milk solids in addition to water, yoghurt is a colloid.
Yoghurt is a colloid because it contains living bacterial cultures, proteins, lipids, and milk solids in addition to water. A colloid forms a homogenous mixture rather than settling or separating over time because the particles or components are uniformly distributed throughout the medium. A water-in-oil emulsion, specifically yoghurt is regarded as an emulsion colloid. This implies that water droplets are evenly distributed across an ongoing fat or oil matrix. The matrix of yoghurt is made up of milk solids, proteins, and lipids, and the water phase is present as droplets. Lactic acid is produced when bacteria in the bacterial culture, including Lactobacillus bulgaricus and Streptococcus thermophilus, ferment milk's lactose.
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Question 5
Now, provide the following information about your chosen molecule: Percent composition of each element
The molecule is water. Molecular formula of water is H₂O. Molecular weight of water is 18 g. The percentage composition of hydrogen and oxygen in water is 11.11 % and 88.89 %. Intermolecular force in water is dipole-induced dipole and London dispersion.
Which molecule is Vital to human body ?Name of the molecule is Water. Molecular formula of the compound is H₂O.
What is the Molecular mass of water ?Molecular mass of H₂O = 2 × Atomic weight of H + Atomic weight of O
= 2 × 1 + 16
= 2 + 16
= 18
The water molecule is Covalent because hydrogen atoms share electrons with the oxygen atom.
How to find the percentage composition ?Percentage composition = [tex]\frac{\text{Mass of element}}{\text{Molar Mass}}[/tex]
Now,
Molar mass of Water = 18
Percentage composition of hydrogen = [tex]\frac{2}{18} \times 100[/tex]
= 11.11 %
Percentage composition of Oxygen = [tex]\frac{16}{18} \times 100[/tex]
= 88.89 %
In water molecule dipole-induced dipole and London dispersion forces are present because water has H-bonds.
The given molecule is water. Water is important for human body to keep a normal temperature. It carries nutrients. It protects our body organs and tissues. The function of water is to serves a s a lubricant. It helps to prevent constipation. It makes up Saliva.
Thus from the above conclusion we can say that The molecule is water. Molecular formula of water is H₂O. Molecular weight of water is 18 g. The percentage composition of hydrogen and oxygen in water is 11.11 % and 88.89 %. Intermolecular force in water is dipole-induced dipole and London dispersion.
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Disclaimer: The question was given incomplete on the portal. Here is the complete question.
Questions: Choose one molecule that is vital to the human body. Provide the following information: Name of the molecule
Now, provide the following information: Molecular formula
Now, provide the following information about your chosen molecule: Molecular mass
Now, provide the following information about your chosen molecule: The type of molecule (covalent or ionic)
Now, provide the following information about your chosen molecule: Percent composition of each element
Now, provide the following information about your chosen molecule: Intermolecular forces within the molecular
Now, provide the following information about your chosen molecule: Describe why the molecule is important and its function within the human body.
State which substance is undergoing oxidation and which substance is undergoing reduction in the following reaction:
2 K (s) + CuCl2 (aq) ---> 2 KCl (aq) + Cu (s)
Answer:
Oxidation - K
Reduction - Cu
Explanation:
2K --> 2K^+
Cu^+2 --> Cu
Given the reaction below, how many liters of oxygen are formed if 77.37 L of water are produced at STP? (4pts)
2C4H10 (g) + 13O2 (g) → 8CO2 (g) + 10H2O (g)
Round your answer to two decimal places.
1.2 x 10² L of oxygen is formed if 77.37 L of water is produced.
The density of water at STP = 0.99 g/ ml but we will assume 1 g/ml
Determine the mass of water ([tex]H_{2}[/tex]o) = 77.37 L × [tex]\frac{1000 ml}{1l}[/tex] × [tex]\frac{1g}{ml}[/tex]
The mass of water = 77370 g
Convert mass into moles = 77370 [tex]H_{2}[/tex]o × [tex]\frac{1mol}{18.01528} H _{2}O[/tex]
= 4294.6876 mol of [tex]H_{2} O[/tex]
Use stoichiometry to find how many mols of oxygen [tex]o_{2}[/tex] were used:
= 4294.6876 mol of [tex]H_{2} O[/tex] × [tex]\frac{13 mol }{10 mol}[/tex]
= 5583.0939 mol [tex]o_{2}[/tex]
Convert mols to mass = 5583.0939 mol ×[tex]\frac{32 g}{mol }[/tex]
= 178659.0059 g [tex]o_{2}[/tex]
Convert mass into liters
The density of [tex]o_{2}[/tex] at STP = [tex]\frac{1.439}{ml}[/tex]
Density of [tex]o_{2}[/tex] = 1.2 × [tex]10^{2}[/tex]
Hence,1.2 x 10² L of oxygen is formed if 77.37 L of water is produced.
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1.2 x 10² L of oxygen is formed if 77.37 L of water are produced at STP. The term is derived from the Greek word "oxy genes," which means "forms acid." a periodic table column that is vertical.
What is oxygen ?
The chemical element oxygen has an atomic number of 8. At normal temperatures and pressures, oxygen transforms into the chemical compound (O2) of two atoms, which is a colorless gas.
The density of H₂O at STP = 0.99 g ÷ ml, but we will assume 1 g/ml
The mass of H₂O = 77370 g
Use stoichiometry to find moles of oxygen given by
= 4294.6876 mol of X
= 5583.0939 mol
Convert moles into mass = 5583.0939 mol X
= 178659.0059 g
Then convert it into liter. 1.2 x 10² L of oxygen is formed if 77.37 L of water.
Thus, 1.2 x 10² L of oxygen is formed if 77.37 L of water are produced at STP.
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The concentration of an HCl acid solution is initially 6mol/L. What would the concentration of a new solution be if 200 mL of the original HCl solution is diluted with 1L of water.
Taking into account the definition of dilution, the concentration of the new solution is 1 mol/L.
DilutionWhen it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.
Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentrationVi: initial volumeCf: final concentrationVf: final volumeFinal volumeIn this case, you know:
Ci= 6 mol/LVi= 200 mLCf= ?Vf= 1 L (1000 mL) water + 200 mL of HCL= 1200 mLReplacing in the definition of dilution:
6 mol/L× 200 mL= Cf× 1200 mL
Solving:
(6 mol/L× 200 mL)÷ 1200 mL= Cf
1 mol/L= Cf
In summary, the concentration of the new solution is 1 mol/L.
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A reaction produces 156 mL of carbon dioxide gas collected
over water at a temperature of 25.0 °C and a pressure of 99.81
kPa. Calculate the volume of CO2 at STP.
mL
Your answer should be rounded to three significant figures. Do not include units
In your answer.
The volume of the CO₂ produced at STP, given the data is 141 mL
Combined gas equationP₁V₁ / T₁ = P₂V₂ / T₂
Where
Initial pressure => P₁Initial temperature => T₁Initial volume => V₁New pressure => P₂New temperature => T₂New Volume => V₂Data obtained from the questionInitial volume (V₁) = 156 mL Initial temperature (T₁) = 25.0 °C = 25 + 273 = 298 KInitial pressure (P₁) = 99.81 KPaNew pressure (P₂) = STP = 101.325 KPaNew temperature (T₂) = STP = 273 KNew volume (V₂) =? How to determine the volume at PP₁V₁ / T₁ = P₂V₂ / T₂
(99.81 × 156) / 298 = (101.325 × V₂) / 273
Cross multiply
298 × 101.325 × V₂ = 99.81 × 156 × 273
Divide both sides by 298 × 101.325
V₂ = (99.81 × 156 × 273) / (298 × 101.325)
V₂ = 141 mL
Thus, the volume of the CO₂ produced at STP is 141 mL
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If a sample of helium gas at 880 torr and 23°C is allowed to expand from 2.4 L to 5.6 L without changing the temperature, what pressure will the helium gas exert?
275 torr
962 torr
2.01 x 103 torr
377 torr
Answer: 962 torr
Explanation:
The buffer is prepared by adding 250mL of 0.80M NH3 to 150mL of 0.50M NH4NO3. What is the pH of the final solution (Kb for NH3 = 1.8 x 10^-5)
The pH of the solution is obtained to be 9.67.
What is a buffer?A buffer is a solution that serves to militate against changes in acidity or alkalinity. The buffer is often made of a solution of a strong acid and its salt or a weak base and its salt.
Now we have the that;
Number of moles of base = 250 /1000 * 0.80 = 0.2 moles
Number of moles of salt = 150/1000 * 0.50 = 0.075 moles
Total volume of the solution = 250 + 150 = 400 mL or 0.4 L
Molarity of the base = 0.2 moles/0.4 L = 0.5 M
Molarity of the salt = 0.075 moles/ 0.4 L = 0.1875 M
pKb = - log( 1.8 x 10^-5) = 4.74
pOH = pKb + log [salt/base]
pOH = 4.74 + log (0.1875/ 0.5)
pOH = 4.33
pH = 14 - 4.33
pH = 9.67
The pH of the solution is obtained to be 9.67.
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Determine the freezing point depression of a solution that contains 2 moles of NaCl in 200 g of water. ( Kf = 1.86°C/m and Kb = 0.512°C/m.)
The freezing point depression of a solution that contains 2 moles of NaCl in 200 g of water (Kf = 1.86 °C/m) is 18.6 °C.
What is the freezing point depression?It is a decrease in the freezing point of a solution, in comparison with the pure solvent.
Step 1. Determine the molality of the solution.The solution contains 2 moles of NaCl in 200 g of water.
b = moles NaCl / Kg water = 2 mol/0.200 kg = 10 m
Step 2. Calculate the freezing point depression.Given the cryoscopic constant (Kf) is 1.86 °C/m for water, the freezing point depression (ΔT) is:
ΔT = Kf × b = 1.86 °C/m × 10 m = 18.6 °C
The freezing point depression of a solution that contains 2 moles of NaCl in 200 g of water (Kf = 1.86 °C/m) is 18.6 °C.
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Hydrogen peroxide is oxidized with permanganate solution to produce oxygen gas by the following reaction:
2H + H2O2 + 2MnO4 -> 2MnO2 + 4H2O + 3O2
In the lab a student mixed 30.0 mL of 0.30 M hydrogen peroxide solution with 30.0 mL of 0.30 M potassium permanganate solution. The oxygen that was produced was collected by water displacement at 298 K and 1.00 atm of pressure. The volume of oxygen collected was 178 mL. (Ignore the effect of water vapor in the collection tube here.)
a.) What is the limiting reactant?
b.) What is the theoretical yield of oxygen gas, in milliliters?
c.) What is the percent yield of oxygen gas?
The percentage yield of the oxygen gas is 60%.
What is the limiting reactant?The reaction equation is;
2H^+ + H2O2 + 2MnO4 -> 2MnO2 + 4H2O + 3O2
Number of moles of hydrogen peroxide = 30/1000 * 0.30 M = 9 * 10^-3 moles
Number of moles of potassium permanganate = 30/1000 * 0.30 M = 9 * 10^-3 moles
Now;
1 mole of H2O2 reacts with 2 moles of permanganate
9 * 10^-3 moles of H2O2 reacts with 9 * 10^-3 moles * 2 moles/1 mole
= 1.8 * 10^-2 moles
Hence, permanganate is the limiting reactant
b) The theoretical yield of oxygen is;
2 moles of oxygen produced 3 moles of O2
9 * 10^-3 moles oxygen produced 9 * 10^-3 moles * 3 moles/2 moles
= 0.0135 moles
If 1 mole of O2 occupies 22.4 L
0.0135 moles of O2 occupies 0.0135 moles * 22.4 L/ 1 mole
= 0.302 L or 302 mL
c) Percentage yield of oxygen = 178 mL/ 302 mL * 100/1
= 60%
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Where are these chemical reactions happening?
Answer:
At Anode: oxidation occurs i.e loss of electrons
At cathode: reduction occurs i.e gain of electrons
OPTION 1 is the correct answer
What does a change in the entropy of a system indicate?
A.
That the disorder of the system has changed
B.
That the equilibrium position has changed
C.
That the energy of the system has changed
D.
That the activation energy has changed
A change in the entropy of a system indicate that the disorder of the system has changed. Option A
What is a change in entropy?A change in entropy indicates is a measure of the disorder, or randomness, in a system.
An increased value of entropy means more disorder, and a decreased value of entropy means less disorder.
These changes in entropy occur spontaneously
Thus, a change in the entropy of a system indicate that the disorder of the system has changed. Option A
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How many grams of Aspirin (acetylsalicylic acid) should we form in this reaction if we started with 2.08g of Salicyclic Acid?
Taking into account the reaction stoichiometry, 2.713 grams of aspirin are formed when 2.08 grams of salicyclic acid reacts.
Reaction stoichiometryIn first place, the balanced reaction is:
C₄H₆O₃ + C₇H₆O₃ (Salicyclic Acid) →C₉H₈O₄ (aspirin) + C₂H₄O₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
C₄H₆O₃: 1 moleC₇H₆O₃: 1 moleC₉H₈O₄: 1 moleC₂H₄O₂: 1 moleThe molar mass of the compounds is:
C₄H₆O₃: 102 g/moleC₇H₆O₃: 138 g/moleC₉H₈O₄: 180 g/moleC₂H₄O₂: 60 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
C₄H₆O₃: 1 mole ×102 g/mole= 102 gramsC₇H₆O₃: 1 mole ×138 g/mole= 138 gramsC₉H₈O₄: 1 mole ×180 g/mole= 180 gramsC₂H₄O₂: 1 mole ×60 g/mole= 60 gramsMass of aspirin formedThe following rule of three can be applied: if by reaction stoichiometry 138 grams of salicyclic acid form 180 grams of aspirin, 2.08 grams of salicyclic acid form how much mass of aspirin?
[tex]mass of aspirin=\frac{2.08 grams of salicyclic acidx 180 grams of aspirin}{138 grams of salicyclic acid}[/tex]
mass of aspirin= 2.713 grams
Then, 2.713 grams of aspirin are formed when 2.08 grams of salicyclic acid reacts.
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Which part of thr drug discovery life cycle can quantum computung impact the most
Molecular simulation is the part of the drug discovery life cycle that most likely uses quantum computing.
What is drug discovery?Drug discovery refers to the process to identify and validate medications in pharmaceutical research.
Drug discovery exploits computational approaches based on quantum modeling to accelerate this process.
In conclusion, molecular simulation is the part of drug discovery associated with quantum computing.
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What happens when food first touches your tongue?
Answer:
you will taste the flavour of the food
(04.03 LC)
Which of the following is a single replacement reaction?
Ba(OH)2 + H₂SO4 → BaSO4 + 2H₂O
O2Mg + O₂2MgO
O H₂O+ CO2 → H₂CO3
O Zn + H₂SO4 → ZnSO4 + H₂
Answer:
D.) Zn + H₂SO₄ ----> ZnSO₄ + H₂
Explanation:
Single-Replacement Reaction: a reaction in which an element in a compound is swapped with another element
ex.) Zn + H₂SO₄ ----> ZnSO₄ + H₂
Double-Replacement Reaction: a reaction in which a cation in one compound is swapped with a cation in another
ex.) Ba(OH)₂ + H₂SO₄ ----> BaSO₄ + 2 H₂O
Synthesis Reaction: a reaction in which two or more elements/compounds combine to form a new molecule
ex.) 2 Mg + O₂ ----> 2 MgO
ex.) H₂O + CO₂ ----> H₂CO₃