Describe the hybrid orbitals used by the central atom and the types of bonds formed in o3
In ozone, the central oxygen atom uses sp² hybridization, forming sigma bonds and also forms a pi bond through an unhybridized p orbital.
Explanation:In ozone (O3), the central oxygen atom uses sp² hybrid orbitals. This hybridization occurs due to mixing one s orbital and two p orbitals, producing three identical hybrid orbitals arranged in a trigonal planar geometry. This bonding arrangement allows the formation of σ (sigma) bonds through orbital overlap.
Besides, ozone is noted for its resonance structure, leading to the formation of single and double bonds between the oxygen atoms. The double bond consists of one σ bond and one π (pi) bond. The sigma bond results from the overlap of hybrid orbitals, while the pi bond comes from the side-by-side overlap of the remaining unhybridized p orbital.
In summary, the central atom in ozone (O3) undergoes sp² hybridization, forming sigma bonds and one pi bond due to unhybridized p orbital.
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Final answer:
In ozone (O3), the central oxygen atom uses sp² hybrid orbitals to form sigma (σ) bonds and has a delocalized pi (π) bond due to resonance. This results in a trigonal planar electron-pair geometry.
Explanation:
Ozone (O3) Hybridization and Bond Types
The central atom in ozone (O3) uses sp2 hybrid orbitals. The reason for this is that there are three regions of electron density around the central oxygen atom, which form a trigonal planar electron-pair geometry, as predicted by the VSEPR theory. The oxygen atom forms two sigma (σ) bonds with the other oxygen atoms using the sp2 hybrid orbitals. The delocalized pi (π) bond present in ozone, which is a characteristic of resonance structures, is formed by the side-by-side overlap of the remaining unhybridized p orbitals from each oxygen atom. This configuration allows for the distribution of the double bond character over the three oxygen atoms.
Multiple bonds in a molecule, such as the bonds in ozone, consist of a σ bond and one or two π bonds. In the case of O3, there is one σ bond between the central oxygen and each of the other two oxygens and one π bond that is delocalized across the molecule, contributing to the resonance structure.
Thus, hybrid orbitals are vital for the formation of covalent bonds in molecular compounds, where they allow for the correct prediction of molecule shapes and bond types.
Three highways connect the centers of three towns and form a triangle. A cell phone company wants to place a new cell tower so that it is the same distance from the centers of the three towns. How can the company find where to place the tower?
Answer:
For the tower to be the same distance from each of the centers, the company must find the point that is equidistant from the vertices of the triangle. This is the circumcenter of the triangle and can be found by constructing the point of concurrency of the perpendicular bisectors of the triangle.
Explanation:
sample response
Which subatomic particle is responsible for chemical properties of atoms?
a. protons
b. neutrons
c. electrons
d. neutrons and protons user: what is the maximum number of electrons in the first electron shell, closest to the nucleus?
a. 1
b. 2
c. 4
d. 8
2 CuCl2 + 2 NaNO3 ---> Cu(NO3)2 + 2 NaCl
If 15 grams of copper (II) chloride react with 20 grams of sodium nitrate, Which is the limiting reagent
In the reaction between copper chloride and sodium nitrate, copper chloride will be the limiting reagent as it has less number of moles.
What are limiting reagents?Limiting reagents are the chemical species that are present in less amount compared to another and get consumed 100 % hence limiting the product formation.
CuCl₂ + 2NaNO₃ → Cu(NO₃)₂ + 2NaCl
Moles of copper chloride: n = 15 ÷ 134.5 = 0.11 moles
Moles of sodium nitrate: n = 20 ÷ 85 = 0.23 moles
From the above reaction, it is seen that 1 mole of copper chloride requires 2 moles of sodium nitrate. So, 0.11 moles will need 0.22 moles of sodium nitrate.
From this, it can be concluded that sodium nitrate is in excess and copper chloride is within the limit.
Therefore, copper chloride will be the limiting reagent and will be consumed first.
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how many moles of O are in 10 moles of KClO3? ...?
Considering the chemical formula, there are 30 moles of O in 10 moles of KClO₃.
Chemical formulaChemical formulas use letters and numbers to represent chemical species, that is, compounds and ions.
The letters are called chemical symbols. They represent the elements present in the chemical species.
The numbers that accompany these letters are what we call subscripts.
A subscript is a number indicating the number of the element present in that compound. If no subscript appears after a chemical symbol, this implies that there is only one atom of that element.
KClO₃In this case, the chemical formula KClO₃ indicates that 1 mole of the compound has:
K= 1 moleCl= 1 moleO= 3 molesSo you can apply the following rule of three: if 1 mole of KClO₃ contains 3 moles of O, 10 moles of KClO₃ contains how many moles of O?
[tex]amount of moles of O=\frac{10 moles of KClO_{3} x3 moles of O}{1 moles of KClO_{3}}[/tex]
amount of moles of O= 30 moles
Finally, there are 30 moles of O in 10 moles of KClO₃.
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There are 30 moles of Oxygen in 10 moles of KClO3.
The chemical formula for potassium chlorate (KClO3) indicates that there is one oxygen atom for each molecule of KClO3. Therefore, the molar ratio of oxygen to potassium chlorate is 1:1. This means that for every mole of KClO3, there is one mole of oxygen atoms.
Given that we have 10 moles of KClO3, we can directly apply the 1:1 molar ratio to find the number of moles of oxygen. Since there is no need for a conversion factor, the number of moles of oxygen is simply equal to the number of moles of KClO3.
Thus, 10 moles of KClO3 contains:
[tex]\[ 10 \text{ moles of KClO3} \times \frac{1 \text{ mole of O}}{1 \text{ mole of KClO3}} = 10 \text{ moles of O} \][/tex]
However, each molecule of KClO3 contains 3 oxygen atoms. Therefore, to find the total number of moles of oxygen atoms, we need to multiply the number of moles of KClO3 by the number of oxygen atoms per molecule:
[tex]\[ 10 \text{ moles of KClO3} \times \frac{3 \text{ moles of O}}{1 \text{ mole of KClO3}} = 30 \text{ moles of O} \][/tex]
So, there are 30 moles of oxygen atoms in 10 moles of KClO3.
How will adding NaCl affect the freezing point of a solution?
Answer is: adding NaCl will lower the freezing point of a solution.
A solution (in this example solution of sodium chloride) freezes at a lower temperature than does the pure solvent (deionized water).
The higher the solute concentration (sodium chloride), freezing point depression of the solution will be greater.
Equation describing the change in freezing point:
ΔT = Kf · b · i.
ΔT - temperature change from pure solvent to solution.
Kf - the molal freezing point depression constant.
b - molality (moles of solute per kilogram of solvent).
i - Van’t Hoff Factor.
Dissociation of sodium chloride in water: NaCl(aq) → Na⁺(aq) + Cl⁻(aq).
Describe how two of the human organ systems interact( work together) to help maintain homeostasis.
Body systems work together to maintain homeostasis by sharing the work of regulating balances of nutrients and other physiological values. For example, the circulatory system delivers oxygen-rich blood to your bones. Meanwhile, your bones are busy making new blood cells.
Homeostasis refers to the ability of an organism to maintain the internal environment of the body within limits that allow it to survive. is a self-regulating process by which biological systems maintain stability while adjusting to changing external conditions.
One of the common example is the physical response to overheating that is sweating, which cools the body by making more moisture on the skin available for evaporation. Whereas, the body reduces heat-loss in cold surroundings by sweating less and reducing blood circulation to the skin. Thus, any change in the normal temperature automatically triggers an opposite feedback.
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Calculate the average atomic mass of carbon if 98.90% of the atoms are C-12 (12.000000 amu) and 1.100% are C-13 atoms (13.003354 amu). Give your answer to the correct number of significant figures.
The average atomic mass of carbon is calculated using the abundances and atomic masses of its isotopes. In this case, it sums up to approximately 12.01 amu.
Explanation:The average atomic mass of carbon is calculated by using the relative abundances and atomic masses of its isotopes. In this case, we consider C-12 and C-13 isotopes for our calculation. The formula to calculate the average atomic mass is:
Multiply the relative abundance of each isotope by its atomic massSum the values obtainedThus, the calculation would look like this:
(0.9890 * 12.000000 amu) + (0.0110 * 13.003354 amu)
This gives an average atomic mass of approximately 12.01 amu for carbon, which aligns with the value listed on the periodic table. Remember to respect the rules of significant figures in your calculation.
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Help I will give brainliest answer!
1. Calculate the number of moles of one level teaspoon of salt (NaCl). Repeat for all the other compounds (Hint: 1000mg = 1g). Fill in the appropriate boxes on the Data Table. Show your work.
2. Calculate the number of moles of each element in one level teaspoon of salt (NaCl). Repeat for all the other compounds. Fill in the appropriate boxes on the Data Table. Show your work.
3. Calculate the atoms of each element for one level teaspoon of salt (NaCl). Repeat for all the other compounds. Fill in the appropriate boxes on the Data Table. Show your work.
4. You measured equal volumes for each of the different compounds. Which of the compounds has the greatest number of moles in one teaspoon?
5. Which of the compounds has the greatest total number of atoms?
6. Why can you use the technique of measuring volume as a means of counting.
Calculate moles of salt by dividing its mass by molecular weight. Atomic moles can be calculated the same way. To calculate number of atoms, multiply moles by Avogadro's number. The compound with greatest moles or atoms in equal volume would be one with lowest molecular weight. Avogadro's law allows counting by volume.
Explanation:To calculate the number of moles of salt (NaCl), you need to know its molecular weight, which is approximately 58.44 g/mol. An average teaspoon of salt weights about 5 grams. So, the number of moles would be mass/molecular weight = 5 g / 58.44 g/mol = 0.086 moles.
NaCl consists of Sodium (Na) and Chlorine (Cl). So, in one mole of NaCl, there is one mole of Na and one mole of Cl. Hence, one teaspoon of salt would contain 0.086 moles of Na and 0.086 moles of Cl.
To calculate the number of atoms, note that 1 mole contains Avogadro's number (6.022 x 1023) of particles. Therefore, one teaspoon of salt contains 0.086 moles x (6.022 x 1023) atoms/mole = 5.18 x 1022 atoms of Na and an equal number of atoms of Cl.
The compound with the greatest number of moles or atoms in one teaspoon would be the one with the smallest molecular weight, assuming all compounds are measured in equal volumes.
Volume measurement can be used to count atoms and moles because, under equal conditions of temperature and pressure, equal volumes of all gases contain the same number of moles (known as Avogadro's law).
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There are approximately 0.0972 moles of NaCl in 1 teaspoon (5.69 grams) of table salt.
To calculate the number of moles of NaCl in 1 teaspoon (5.69 grams), we follow these steps:
Molar mass of NaCl: Sodium chloride (NaCl) has a molar mass of:
[tex]\[ \text{Molar mass of NaCl} = \text{atomic mass of Na} + \text{atomic mass of Cl} \][/tex]
[tex]\[ \text{Atomic mass of Na} = 22.99 \, \text{g/mol} \][/tex]
[tex]\[ \text{Atomic mass of Cl} = 35.45 \, \text{g/mol} \][/tex]
[tex]\[ \text{Molar mass of NaCl} = 22.99 \, \text{g/mol} + 35.45 \, \text{g/mol} = 58.44 \, \text{g/mol} \][/tex]
Calculate number of moles: Use the formula for moles:
[tex]\[ \text{Number of moles} = \frac{\text{Mass}}{\text{Molar mass}} \][/tex]
Given mass = 5.69 grams,
[tex]\[ \text{Number of moles of NaCl} = \frac{5.69 \, \text{g}}{58.44 \, \text{g/mol}} \][/tex]
[tex]\[ \text{Number of moles of NaCl} \approx 0.0972 \, \text{moles} \][/tex]
Express the answer with three significant figures:
[tex]\[ \text{Number of moles of NaCl} \approx 0.0972 \, \text{moles} \][/tex]
The complete question is
A teaspoon of table salt contains 5.69 grams of NaCl. Calculate the number of moles in 1 teaspoon. Express your answer with three significant figures.
A)How many moles of O2 are required for the complete combustion of 2.2 g of C3H8 to form CO2 and H2O?
b)A 65.25 g sample of CuSO4•5H2O (M = 249.7) is dissolved in enough water to make 0.800 L of solution. What volume of this solution must be diluted with water to make 1.00 L of 0.100 M CuSO4?
Final answer:
0.2495 moles of [tex]O_2[/tex] are required for the complete combustion of 2.2 g of [tex]C_3H_8[/tex] to form [tex]CO_2[/tex] and [tex]H_2O[/tex]. This is calculated based on the balanced chemical equation for the combustion of propane and the molar mass of [tex]C_3H_8[/tex].
Explanation:
To determine how many moles of [tex]O_2[/tex] are required for the complete combustion of 2.2 g of [tex]C_3H_8[/tex] to form [tex]CO_2[/tex] and H2O, we need to use the balanced chemical equation for the combustion of propane (C3H8):
[tex]C_3H_8[/tex] + 5 [tex]O_2[/tex] → 3 [tex]CO_2[/tex] + 4[tex]H_2O[/tex]
First, we calculate the moles of C3H8:
moles of C3H8 = mass (g) / molar mass (g/mol)
molar mass of [tex]C_3H_8[/tex] = 44.10 g/mol
moles of [tex]C_3H_8[/tex] = 2.2 g / 44.10 g/mol = 0.0499 mol
From the balanced equation, 1 mole of [tex]C_3H_8[/tex] reacts with 5 moles of [tex]O_2[/tex]. So, for 0.0499 moles of [tex]C_3H_8[/tex], the moles of [tex]O_2[/tex] required would be:
moles of [tex]O_2[/tex] needed = 0.0499 mol [tex]C_3H_8[/tex] × 5 moles O2/mol [tex]C_3H_8[/tex] = 0.2495 mol [tex]O_2[/tex]
0.2495 moles of [tex]O_2[/tex] are required for the complete combustion of 2.2 g of [tex]C_3H_8[/tex].
What characterizes a heterogeneous mixture?
A. The substances are dissolved in the mixture.
B. The substances are evenly mixed throughout.
C. The mixture is made up of different consistencies.
D. The mixture is made up of a single consistency.
Answer: C. The mixture is made up of different consistencies.
Explanation:
A heterogenous mixture is substance constituted by two or more pure substances (elements or compounds) in any proportion, where each pure substance keeps its individual properties, the mixture does not have uniform properties, and each pure substance remains separated, in different phases, which is what the term consistencies means.
Some examples of heterogeneous mixtrures are: sand and water, oil and water.
For better visualization think on this: i) pure water is a pure substance (a compound with definite composition), ii) sea water is a homogeneous mixture (sal and water keep their individual properties, may be in any proportion one respect each other, and are intimimated mixed forming a solution), and iii) water with sand form a heterogeneous mixture (you can observe clearly two phases).
From your knowledge about the distribution of electrons in the levels and from the atomic number (in parentheses), indicate the most likely charge on the ion when this atom forms an ion. (Remember the 2, 8, 18 level distribution.)
Answer Choices:
0
-1
+1
-2
+2
Find all solutions in the interval [0, 2π).
7 tan3x - 21 tan x = 0
Hence, all the solutions in the interval [0,2π) are:
[tex]0\ ,\pi\ ,\dfrac{\pi}{3}\ ,\dfrac{2\pi}{3}\ ,\dfrac{4\pi}{3}\ ,\dfrac{5\pi}{3}[/tex]
Explanation:We are asked to find the solution of the trignometric identity which is given by:
[tex]7\tan^3x-21\tan x=0[/tex]
On dividing both side by 7 we get:
[tex]\tan^3x-3\tanx=0\\\\i.e.\\\\\tan x(\tan^2 x-3)=0[/tex]
i.e.
Either
[tex]\tan x=0[/tex]
i.e.
[tex]x=0,\pi[/tex]
or
[tex]\tan^2x-3=0\\\\i.e.\\\\\tan^2x=3\\\\i.e.\\\\\tan x=\pm \sqrt{3}[/tex]
If
[tex]\tan x=\sqrt{3}\\\\Then\\\\x=\dfrac{\pi}{3},\dfrac{4\pi}{3}[/tex]
and if
[tex]\tan x=-\sqrt{3}\\\\Then\\\\x=\pi-\dfrac{\pi}{3}=\dfrac{2\pi}{3}\\\\and\\\\x=2\pi-\dfrac{\pi}{3}\\\\i.e.\\\\x=\dfrac{5\pi}{3}[/tex]
Hence, all solutions are:
[tex]0\ ,\pi\ ,\dfrac{\pi}{3}\ ,\dfrac{2\pi}{3}\ ,\dfrac{4\pi}{3}\ ,\dfrac{5\pi}{3}[/tex]
which substance contains metallic bonds (1)Hg (2)H2O (3) NaCL (4)C6H12O6
Answer:
The answer is (1) Hg
Explanation:
Hg is mercury. It is a metal, so the elemental substance have Hg atoms that interact each other by metallic bonds.
The other options do not contain metallic bonds:
(2) H₂O is water, and contains covalent bonds
(3) NaCl is sodium chloride and is a ionic compound (ionic bonds)
(4) C₆H₁₂O₆ is glucose, and the atoms are covalently bonded.
Answer: (1) [tex]Hg[/tex]
Explanation:
A covalent bond is formed when an element shares its valence electron with another element. This bond is formed between two non metals. Example: [tex]H_2O[/tex] and [tex]C_6H_{12}O_6[/tex]
An ionic bond is formed when an element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element and the element which accepts the electrons is known as electronegative element. This bond is formed between a metal and an non-metal. Example: [tex]NaCl[/tex]
Metallic bond is defined as the bond which is formed between positively charged atoms having free electrons and are shared among a lattice of cations. This is usually formed between metals. Example: [tex]Hg[/tex]
What can scientists learn by studying fossils? I. how the Earth's surface has changed over time II. the appearance of an organism and its structures III. how species have changed over time IV. how the Earth's climate has changed over time
Scientist can learn about Appearance of an organism and its structure by studying the fossils. hence, option" 2" Is correct.
What can scientist learn from fossil?By the method of radiocarbon-dating scientist can learn about an organism and its structures in the fossils, different kinds of rocks and about the earth strata.
hence, option" 2" is the correct option.
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How many sigma and how many pi bonds are in an ethyne molecule c2h2?
Milk of magnesia is a base. What happens when you drink milk of magnesia for an upset stomach?
A)
It raises the pH of your stomach.
Eliminate
B)
It lowers the pH of your stomach.
C)
It cleanses the stomach of harmful, painful bacteria.
D)
It coats the walls of your stomach with a protective layer.
Answer:
A)
It raises the pH of your stomach.
Explanation:
Milk of magnesia raises the pH of your stomach. This is because the pH of your acidic stomach is well below 7. Adding something with a high pH (a base) will raise the pH back to where it should be.
Milk of magnesia is a basic substance that neutralizes excess stomach acid by raising the pH of the stomach, thus relieving symptoms like heartburn and indigestion, hence option A is correct.
When you drink milk of magnesia for an upset stomach, it acts as an antacid. The chemical formula for milk of magnesia is Mg(OH)2. Being a base with a pH greater than 7, milk of magnesia reacts with the hydrochloric acid (HCl) in your stomach, which is part of the gastric juice involved in digestion. This is a neutralization reaction where the base (milk of magnesia) neutralizes the excess stomach acid, thus effectively raising the pH of your stomach, and relieving symptoms like heartburn and indigestion.
This neutralization reaction can be represented as:
Mg(OH)2(s) + 2HCl(aq) → 2H2O(l) + MgCl2(aq).
The correct answer to the student's question is A) It raises the pH of your stomach.
one molecule of chlorophyll contains 137 atoms. how many of these atoms come from the metal magnesium?
Depict the hydrogen bonding between two ammonia molecules and between one ammonia molecule and one water molecule?
Answer:
Hydrogen bondings are shown below.
Explanation:
Hydrogen bonding takes place between an electronegative atom (O, N and F) and H atom attached to those electronegative atoms (O, N and F). Lone pairs on electronegative atoms are involved in formation of hydrogen bond.
Electronegative atom of a molecule which donates it's lone pair to form hydrogen bonding is called hydrogen bond donor. And the other molecule whose H atom is involved in hydrogen bonding is called hydrogen bond acceptor.
Hydrogen bond is a kind of bond whose strength is an intermediate to ionic and covalent bond.
Hydrogen bonding is represented as dash lines.
Hydrogen bonding between ammonia molecules and between ammonia and water molecule has been shown below.
Hydrogen bonding in ammonia molecules occurs due to attraction between the nitrogen atom of one molecule (negative charge) and the hydrogen atom of another (positive charge). The same principle applies between an ammonia molecule and a water molecule.
Explanation:Hydrogen bonding in ammonia molecules (NH3) occurs due to attraction between the nitrogen atom of one molecule, which carries a partial negative charge, and the hydrogen atom of another molecule which carries a partial positive charge. With regard to an ammonia molecule and a water molecule (H2O), hydrogen bonds can form in a similar fashion.
The partial positively charged hydrogen atom of the ammonia molecule can attract the partial negatively charged oxygen atom of the water molecule, forming a bond.
Similarly, the partial positively charged hydrogen atoms of the water molecule can attract to the partial negatively charged nitrogen atom of ammonia, creating another hydrogen bonding.
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how many molecules are there in 237 grams of CCl4
You can find the number of molecules in a given mass of substance by first finding the number of moles in the mass, and then multiplying by Avogadro's number. Using this method, 237 grams of CCl4 contains approximately 9.27 × 10^23 molecules.
Explanation:To calculate the number of molecules in 237 grams of CCl4, you need to understand Avogadro's number and the concept of the mole. The molar mass of CCl4 is about 154 g/mol. So, first let's find out how many moles are in 237 grams.
Number of Moles = Mass / Molar Mass = 237 g / 154 g/mol = 1.54 moles.
Avogadro's number states there are 6.02214076 × 10^23 molecules in one mole.
So, the number of molecules in 1.54 moles would be: Number of Molecules = Number of Moles * Avogadro's Number = 1.54 moles * 6.02214076 × 10^23 molecules/mole
The result is approximately 9.27 × 10^23 molecules of CCl4.
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There are approximately 9.28 imes 10^23 molecules of CCl4.
To calculate the number of molecules in 237 grams of CCl4 (carbon tetrachloride), we first need to determine the molar mass of CCl4. The molar mass of carbon (C) is approximately 12.01 g/mol, and that of chlorine (Cl) is approximately 35.45 g/mol. Since CCl4 has one carbon atom and four chlorine atoms, its molar mass is (12.01 g/mol + (4 imes 35.45 g/mol) = 153.81 g/mol.
Next, we use the given mass of CCl4 to find the number of moles:
237 g CCl4 imes rac{1 mol CCl4}{153.81 g CCl4} = 1.541 moles of CCl4
Using Avogadro's number, which is 6.022 imes 1023 molecules per mole, we can then calculate the number of molecules:
1.541 moles imes 6.022 imes 1023 molecules/mol = 9.28 imes 1023 molecules of CCl4
So, there are approximately 9.28 imes 1023 molecules in 237 grams of CCl4.
the density of ethanol is 0.789g/ml at 20°c. find the mass of a sample of ethanol that has a volume of 150.0 ml at this temperature.
The density of the substance is denoted by the symbol ρ or D. The mass of the ethanol sample with a density of 0.789 g/ml in 150 mL at 20°C will be 118.35 g.
What is the relationship between density and mass?The density of the object has been defined by the mass divided by the unit of volume and shows the direct relationship between mass and density. A heavier object has more density as compared to a lighter object.
The formula for density is given as,
Density = mass ÷ volume
or Mass = density × volume
Given,
Density = 0.789 gm/mL
Volume = 150 mL
Mass is calculated by substituting values in the above formula as,
Mass = density × volume
Mass = 0.789 gm/mL × 150 mL
Mass = 118.35 g
Therefore, a 150.0 mL ethanol at a temperature 20°C with a density of 0.789 gm/mL has a mass of 118.35 g.
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Which of the following solutes will lower the freezing point of water the most?
A) the molecular compound sucrose (C₁₂H₂₂22O₁₁)
B) the iconic compound magnesium sulfate (MgSO₄4)
C)the iconic lithium chloride (LiCI)
D)the iconic compound calcium fluoride(CaF₂2)
Answer: D) the iconic compound calcium fluoride (CaF₂)
Explanation:
[tex]\Delta T_f=i\times k_f\times m[/tex]
where,
[tex]\DeltaT_f[/tex] = change in freezing point
i= vant hoff factor
[tex]k_f[/tex] = freezing point constant
m = molality
A) the molecular compound sucrose (C₁₂H₂₂O₁₁)
: For non electrolytes like sucrose, vant hoff factor is 1.
B) the iconic compound magnesium sulfate (MgSO₄): For electrolytes, vant hoff factor is equal to the number of ions it produce on dissociation.
[tex]MgSO_4\rightarrow Mg^{2+}+SO_4^{2-}[/tex] Thus i= 2
C) the iconic lithium chloride (LiCI):
[tex]LiCl\rightarrow Li^++Cl^-[/tex], thus i=2.
Thus 1% produces most ions and thus lowers the freezing point to maximum.
D) the iconic compound calcium fluoride(CaF₂):
[tex]CaF_2\rightarrow Ca^{2+}+2F^-[/tex], thus i=3.
Thus the compound with highest value of i, will depress the freezing point to maximum.
In a chemical reaction, an iron atom became the ion Fe2+. What happened to the iron atom?
It lost electrons and was oxidized
When molten material hardens and cools, what type of rock is formed?
Determine the identity of a cube of metal that measures 1.2 cm on each side and has a mass of 15.4g.
To identify the metal of the cube, calculate the cube's density by dividing its mass (15.4g) by its volume (1.728 cm³), which gives a density of approximately 8.91 g/cm³. This density can be compared to known densities to determine the cube's metal type.
Explanation:The identity of a metal cube can be determined using its mass and volume to calculate its density, which can then be compared to known densities of various metals. A cube with each side measuring 1.2 cm has a volume given by the formula V = a³ where a is the length of a side. The mass of the cube is 15.4 g, and therefore the density can be calculated by dividing the mass by the volume.
To find the volume of the cube:
V = 1.2 cm × 1.2 cm × 1.2 cm = 1.728 cm³.
Now, to get the density:
density = mass/volume = 15.4 g / 1.728 cm³ ≈ 8.91 g/cm³. This density can be matched to a list of metallic element densities to identify the metal.
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Given the atomic weights of carbon, 12.01; hydrogen, 1.01; and oxygen, 16.0, what is the molar mass of glucose?
A) 166.18 grams
B) 174.12 grams
C) 180.18 grams
D) 250.12 grams
According to newtons third law forces always occur in equal but____ pairs?
All of the following can be used to define a base except
a hydronium ion donor in a reaction
a substance that increases the concentration of hydroxide ions
an electron pair donor in a reaction
a substance that is a hydrogen ion acceptor in a reaction
Answer: The correct statement is a hydronium ion donor in a reaction.
Explanation:
According to Arrhenius concept, a base is defined as a substance which donates hydroxide ions [tex](OH^-)[/tex] when dissolved in water and an acid is defined as a substance which donates hydronium ions [tex](H_3O^+)[/tex] in water.
According to the Bronsted Lowry conjugate acid-base theory, an acid is defined as a substance which donates protons and a base is defined as a substance which accepts protons.
According to the Lewis concept, an acid is defined as a substance that accepts electron pairs and base is defined as a substance which donates electron pairs.
A substance that increases the hydroxide ion concentration of a solution is an Arrhenius base.
Hence, the correct statement is a hydronium ion donor in a reaction.
Calculate the electrical energy per gram of anode material for the following reaction at 298 K:
Li(s) + MnO2(s) ----> LiMnO2(s)
Ecell = 3.15 V
The answer is:
E per gram = 0.45 V
The explanation:
when MnO2 is the substance who oxidized here so, the oxidizing agent and the anode here is Li.
and when the molar mass of Li is = 7 g/mol
and in our reaction equation we have 1 mole of Li will give 3.15 V of the electrical energy
that means that :
7 g of Li gives → 3.15 V
So 1 g of Li will give→ ???
∴ The E per gram = 3.15 V / 7 g of Li
= 0.45 V
The hydrogen bomb uses the process of _____
-nuclear fusion
-nuclear fission
-hydrogen radioactivity
-spontaneous decay
Answer:
nuclear fusion