Answer: 5kg
Explanation: formula K=1/2mv^2
50=10m
Answer:
C
Explanation:
KE = 1/2 m v^2
KE *2 / v^2 = m
50 (2)/ 10^2 = m = 1 kg
PLEASE HELP
Write the empirical formula for at least four lonic compounds that could be formed from the following : Fe^ 3+ ,C 2 H 3 O 2 ,CN; pb^ 4+
The empirical formula refers to the simplest formula of a compound.
What is the empirical formula?The term empirical formula refers to the simplest formula of a compound. The empirical formula shows us the ratio of the atoms that are involved in the compound. It does not show the actual number of the atoms in the molecule as this is shown by the molecular formula. However, the arrangement of atoms in the compound is shown by the structural formula.
Now, let us write the compounds that can be formed rom each ion;
1) Fe^3+
-FeCl3
-FeBr3
-FeI3
-FeF3
2) C2H3O2^-
-NaC2H3O2
-KC2H3O2
-Ca(C2H3O2)2
-Mg(C2H3O2)2
3)
CN^-
-Fe(CN)3
-CsCN
-NaCN
-KCN
4) Pb^4+
-PbCl4
-PbI4
-PbBr4
-PbF4
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What atomic or hybrid orbital on the central br atom makes up the sigma bond between this br and an outer f atom in bromine trifluoride, brf3 ?
Atomic or hybrid orbital on the central br atom makes up the sigma bond between this br and an outer f atom in bromine trifluoride, brf3 is sp2 hybridization
Trigonal hybridization is another name for sp2 hybridization. It entails combining one's' orbital with two 'p' orbitals of equal energy to create a new hybrid orbital known as sp2. A trigonal symmetry combination of s and p orbitals that is kept at 120
One of the hybrid orbitals formed when one s orbital and two p orbitals are mathematically merged to form three new equivalent orbitals orientated toward the corners of a triangle is sp2 hybridization.
The only feasible molecule geometry for sp2 hybridized center atoms is trigonal planar. When all of the bonds are in place, the shape is trigonal planar as well.
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Identify the classification of whipped cream. group of answer choices aerosol solid aerosol foam emulsion solid emulsion
The classification of whipped cream is a foam.
So, option C is correct one.
The whipped cream is a colloid and it consists of gas ( dispersed phase ) in liquid ( dispersed medium) system.
Sol is a solid dispersed in the liquid . Examples includes Au , S sol in water , milk of magnesia .
The emulsion is liquid dispersed into the liquid . Example is milk
Foam is a gas dispersed into the liquid . Examples includes whipped cream , shaving cream , foam on the beer .
Gel is the liquid dispersed into the solid . Examples includes , butter , jellies .
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PLEASE HELP , what is the concentration of Br, molecules in a solution containing 1.6g of bromine in 250cm of solution
The concentration of the bromine solution, given the data is 0.04 M
What is molarity?Molarity is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:
Molarity = mole / Volume
How to determine the mole of bromine molecule (B₂)Mass of B₂ = 1.6 gMolar mass of bromine molecule (B₂) = 80 × 2 = 160 g/molMole of bromine molecule (B₂) = ?Mole = mass / molar mass
Mole of bromine molecule (B₂) = 1.6 / 160
Mole of bromine molecule (B₂) = 0.01 mole
How to determine the molarity of the bromine solutionMole of bromine molecule (B₂) = 0.01 moleVolume of solution = 250 cm³ = 250 / 1000 = 0.25 LMolarity bromine solution =?Molarity = mole / Volume
Molarity bromine solution = 0.01 / 0.25
Molarity bromine solution = 0.04 M
Thus, molarity of the bromine solution is 0.04 M
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If the titration of h2po4− in a urine sample was continued until all of the acid in the solution was neutralized, how many equivalents of naoh would be needed to fully neutralize the solution?
Two equivalents of NaOH are needed to fully neutralize the solution.
What is a neutralization reaction?A neutralization reaction involves the reaction of an acid and a base to form salt and water. The reaction is exothermic in nature.
For example,
[tex]HCl (aq) + NaOH(aq)\rightarrow NaCl(aq) + H_2O (l)[/tex]
During the titration of [tex]H_2PO_4^-[/tex] it gives [tex]2H^+[/tex].
[tex]H_2PO_4^- \rightarrow 2H^+ +PO_4^3^-[/tex]
To neutralize these [tex]2H^+[/tex], 2 [tex]OH^-[/tex] is needed which come from 2 equivalents of NaOH
[tex]2NaOH \rightarrow2 Na^+ +2OH^-[/tex]
Therefore, 2 equivalents of NaOH are needed
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How might the yield of 1-bromobutane be affected if water was not added, and what product(s) would be favored?
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What can you say about an unknown compound when dissolved in distilled water and with ph paper, gave an estimated ph of about 13. 3?
The pH of the solution is used to estimate the acidic and the alkaline condition. The pH paper can be used to determine the conditions. The compound with pH 13.3 is basic.
What is pH?The concentration of the hydrogen or the hydroxide ion in the water gives the estimate of the pH. The potential and the amount of hydrogen decide the acidic and the basic compound.
The pH scale ranges from 0-14 where the scale of 0-6 is acidic, 7 is neutral and 8-14 is basic. If the substance shows a pH of 13.3 then it will lie in the basic range.
Therefore, the compound with a pH of 13.3 is basic.
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What volume would a 0. 250 mole sample of h2 gas occupy if it had a which a a pressure of 1. 70 atm and a temperature of 35 C?
The volume of 0. 250 mole sample of [tex]H_{2}[/tex] gas occupy if it had a pressure of 1. 70 atm and a temperature of 35 °C is 3.71 L.
Calculation,
According to ideal gas equation which is known as ideal gas law,
PV =n RT
P is the pressure of the hydrogen gas = 1.7 atmVis the volume of the hydrogen gas = ?n is the number of the hydrogen gas = 0.25 moleR is the universal gas constant = 0.082 atm L/mole KT is the temperature of the sample = 35°C = 35 + 273 = 308 KBy putting all the values of the given data like pressure temperature universal gas constant and number of moles in equation (i) we get ,
1.7 atm×V = 0.25 mole ×0.082 × 208 K
V = 0.25 mole ×0.082atm L /mole K × 308 K /1.7 atm
V = 3.71 L
So, volume of the sample of the hydrogen gas occupy is 3.71 L.
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If the concentration of a dilute solution of nitric acid is 0. 0001 m. What is the ph of that solution?
If the concentration of a dilute solution of nitric acid is 0. 0001 M. The pH of the solution is 4.
What is pH ?pH is used to measure whether the substance is acidic, basic or neutral and the range is 0 - 14.
How to find the pH of the solution ?To calculate the pH hydrogen ion it is expressed as:
pH = - log [H⁺]
So, concentration of hydrogen ion in HNO₃ is 0.0001 M.
pH = - log [0.0001]
= [tex]-\log (\frac{1}{10000})[/tex]
= - log (10)⁻⁴
= -4 × - log (10)
= - 4 × (-1)
= 4
Thus from the above conclusion we can say that The pH of the solution is 4.
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The chemical formula H2O represents one molecule of water.
How many total atoms are present in this molecule? Use the words atom, molecule, and subscript in your answer.
There is a total of three atoms present in the water (H₂O) molecule.
What is an atom?An atom is the smallest particle of an element that may or may not be capable of independent existence.
What is a molecule?A molecule is the smallest particle of an element or compound that can exist freely.
What is a subscript?Subscripts are the numbers that come below after a symbol. They tell you the number of atoms of an element. If there is no subscript then it is understood that the subscript is 1.
How to calculate the number of atoms in a molecule?For calculating the number of atoms in a molecule, add the subscripts of that molecule, and you will get the total atoms of it.
For example, in molecule C₂H₅O, there are 2 carbon atoms, 5 hydrogen atoms, and 1 oxygen atom.
Add the subscripts
2 + 5 + 1 = 8
Hence, there is a total of 8 atoms in C₂H₅O.
For the H₂O molecule,
2 + 1 = 3
Hence, there is a total of 3 atoms present in one water molecule.
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When pcl5 solidifies it forms pcl4 cations and pcl6–anions. according to valence bond theory, what hybrid orbitals are used by phosphorus in the pcl4 cations?
When pcl5 solidifies it forms pcl4 cations and pcl6–anions. according to valence bond theory, hybrid orbitals that are used by phosphorus in the pcl4 cations are one orbital of s and three orbital of p as it is sp³hydridised.
What is sp³ hybridization?Hybridization is a process or system which specifies the shape and geometry of any element or molecule with bond angles too.
The pcl4 cation is sp³ hybridized because of the phosphorus behave as a central atom here and the 4 chloride molecules are attached with the p- orbitals to the phosphorus molecule.
Therefore, pcl4 cation is sp³ hybridized.
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What is the compound number (enter both the number and letter without spaces e. g. 1d, 2h) for trans-cinnamic acid?
99 140-10-3.
99 140-10-3 is the compound number for trans-cinnamic acid.
What do you mean by compound numbers?A subscript is the little number that appears to the right of an element's symbol. That figure represents how many atoms of that element are contained in the complex.What is the purpose of trans-Cinnamic acid?The creation of trans-cinnamic acid's methyl, ethyl, and benzyl esters is its primary usage, while it is also used to make flavors, colors, and medications. These esters play a significant role in perfume composition. The sweetener aspartame is a precursor of the acid.What other name would you give trans-Cinnamic acid?Phenolacrylic acid
The class of chemical compounds known as cinnamic acids includes trans-cinnamic acid, often referred to as (e)-cinnamic acid or phenylacrylic acid. These are organic aromatic compounds that generate 3-phenylprop-2-enoic acid from benzene and a carboxylic acid group.To learn more about trans-cinnamic acid visit:
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2. 109×103 g of ethylene glycol, c2h4(oh)2, are dissolved in 2. 40×103 g of water. what is the mole fraction of ethylene glycol?
The mole fraction of ethylene glycol is 0.203.
What is a mole fraction?The mole fraction represents the number of moles of a specific component divided by the total number of moles present in the given solution.
It is a method of expressing the concentration of a solution
Mole fraction can be represented by x. Let a solution consists of components A and B then, the mole fraction is
[tex]Mole fraction of solute, n_A = \frac{n_A}{n_A+n_B}[/tex]
[tex]Mole fraction of solvent, n_B = \frac{n_A}{n_A+n_B}[/tex]
The molar mass of ethylene glycol = 62 g
Given the mass of ethylene glycol = 2.109 x 10³ g
The molar mass of water = 18 g
Given the mass of water= 2.40×10³ g
No moles of ethylene glycol, [tex]n_A[/tex] = [tex]\frac{2.109 \times 10^3 g}{62 g}[/tex]
=34.02
No of moles of water, [tex]n_B[/tex] = [tex]\frac{2.40 \times 10^3 g}{18 g}[/tex] = 133.33
Mole fraction of ethylene glycol = [tex]x = \frac{n_A}{n_A +n_B}[/tex] = [tex]\frac{34.02}{34.02+133.33} = \frac{34.02}{167.35}[/tex]
= 0.203
Hence, The mole fraction of ethylene glycol is 0.203
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URGENT PLEASE HELP
In an experiment, hydrochloric acid reacted with different volumes of sodium thiosulfate in water. A yellow precipitate was formed during the reaction. A cross drawn at the base of each flask became gradually invisible due the formation of this yellow precipitate. The time taken for the cross to become invisible was recorded. A partial record of the experiment is shown.
Experimental Record
Flask Volume of
HCl Volume of
Sodium Thiosulfate Volume of
Water Time
1 10 mL 10 mL 40 mL 14 seconds
2 10 mL 20 mL 30 mL
3 10 mL 30 mL 20 mL
4 10 mL 40 mL 10 mL
Based on your knowledge of factors that affect the rates of chemical reactions, predict the trend in the last column of the experimental record. Use complete sentences to explain the trend you predicted. You do not have to determine exact values for time; just describe the trend you would expect (increase or decrease) and why it occurs.
The trend will be such that the time taken for the cross to disappear will be increasing.
Rate of reactionsThe rate of reactions is affected by the concentration of reactants. The more concentrated the reactants are, the more the rate of the reaction, and vice versa. This is based on the condition that all other factors are kept constant.
In the illustrated reaction, the volume of sodium thiosulfate decreases downward while the volume of water increases. This means that the sodium thiosulfate gets more diluted as we move downward.
Thus, the reaction rate will keep decreasing. In other words, more time would be needed for the cross to disappear as the concentration of sodium thiosulfate decreases.
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A dark purple liquid is diluted by adding water.
The diluted liquid becomes a pale purple colour.
Explain the process that causes this change.
Refer to particles in your answer
Answer: The process is diffusion.
Explanation:
a dark liquid will have the highest concentration of dark purple atoms/molecules so it gives a concentrated colour.
when water is added to it, the colourless water molecules fill up the gaps between the purple particles and so their colour fades and becomes lighter and lighter as we add more water. see the image attached where imagine the red particles are water and the blue particles are purple particles. thats why the colour fades.
The density (mass/volume) of aluminum is 2.70 times. 103 kilograms per cubic meter (kg/m3). what is the mass of an aluminum cylinder that has a volume of 1.50 m3? 5.56 times. 10–4 kg 1.50 times. 10–3 kg 1.80 times. 103 kg 4.05 times. 103 kg
Mass of aluminum = (1.50 m^3)( 2.70 x 10^3 kg/m^3) = 4050 kg
The intention of density is the assembly per volume of the substance. This is an intrinsic property consequently the size (or any external feature) does not change this effects.
What is Aluminum?Aluminum is a silvery-white metal, the 13 elements in the regular table. One surprising fact regarding aluminum is that it's the most widespread metal on Earth, making up more than 8% of the Earth's core mass. It's also the third most standard chemical essence on our planet after oxygen and silicon.The formed aluminum is in everyday use in mining, manufacturing, and trade in the United States; the formed aluminum is used with reasonable uniformity in Great Britain and typically by chemists in the United States.Aluminum (Al), also spelled aluminum, chemical component, a weightless silvery-white metal of main Group 13 (IIIa, or boron group) of the periodic table. Aluminum is the most plentiful metallic component in Earth's crust and the numerous widely used nonferrous metal.To learn motrev about Aluminum, refer to:
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Answer: D
Explanation: 4.05 x 10^3 kg
A(n) ________ is a fixed number of atoms held together by chemical bonds in a certain spatial arrangement.
Answer:
Molecule
Explanation:
What types of elements have atomic radii which remain relatively constant across a period? group of answer choices transition metal elements nonmetal
"Transition metal elements" are the type of element which have atomic radii which remain relatively constant across a period.
Periods refer to the horizontal lines of the periodic table. Each period represents the sequential occupation of an atom's valence shell orbitals, also with longer periods representing the employment of an atom's d subshell orbitals.
As the atomic number rises, more electrons, as well as protons, are present, increasing attraction over time, which drives the atomic radius to shrink over time.
Therefore, "Transition metal elements" are the type of element which have atomic radii which remain relatively constant across a period.
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What type of compound results from the reaction of an acid chloride and a 2° amine?
Amide is produced when a 2° amine and an acid chloride combine.
Acid chloride: What is it?
The chemical name for acid chloride is RCOCl, where "R" stands for a side chain. They are reactive derivatives of carboxylic acids. In organic chemistry, an acyl group and a chlorine atom form an organic molecule known as an acyl chloride (also known as acid chloride). A functional group identified by the RCO molecular formula is called an acyl group. Since acyl chlorides are often hazardous, handling them requires extra care. They have the potential to produce HCl and organic compounds when they interact with water on the surface of the eye, irritating the eye. Anhydrous acid salts are neutral because it lacks an H+ donor.Learn more about acid chloride here:
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Which of these atoms is the most electronegative?
a. si
b. cl
c. p
d. f
e. c
The Chlorine and fluorine atoms are the most electronegative.
So, option D and E is correct one.
The atom of a given chemical elements having tendency to attract bonded pair of electron toward itself is called electronegativity. The electronegativity of atoms is affected by both its atomic number and distance at which its valence electrons resides from the charged nucleus.
The electronegativity of the elements is increases on moving left to right in the period of periodic table while decreasing on moving top to bottom in the group of periodic table .
Example:
The elctronegativity of fluorine atom = 3.98
The elctronegativity of chlorine atom =3.16
The elctronegativity of carbon atom = 2.25
The elctronegativity of phosphorus atom = 2.19
The elctronegativity of silicon atom = 2.58
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Describe how the pH of anti-acid powder can be determined
Describe how solid ammonium chloride can be separated from a mixture of ammonium chloride and anhydrous calcium chloride
please help it's agent
There exist ways in separating mixtures of chloride salts such as that sodium chloride and ammonium chloride. It can be accomplished by crystallization, filtration, or sublimation.
What is pH of Anti-acid powder?
An antacid exists as a substance that neutralizes stomach acidity and stands habituated to relieve heartburn, indigestion, or an upset stomach.
Antacids increase the pH of the stomach contents toward neutrality. An antacid that increases the pH from 1.5 to 3.5 produces a 100-fold decrease in the concentration of gastric acid. Furthermore, the reduction of acidity exists escorted by inhibition of pepsin activity, another essential component of the digestive juice.
There exist ways in separating mixtures of chloride salts such as that sodium chloride and ammonium chloride. It can be accomplished by crystallization, filtration, or sublimation. The easiest approach among the three exists separation by sublimation.
Ammonium chloride sublimes upon heating. The sublimation exists as a decomposition of ammonium chloride forming ammonia and hydrogen chloride.
Sodium chloride on the other hand doesn't sublime and includes a more increased melting point than ammonium chloride. If we want to divide the mixture, we have to heat it to 330-350 degrees Celsius and manage the gas that will be produced.
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What best describes how chlorine molecules, cl2, would behave if mixed with water?
The chlorine molecules, cl2, would behave if mixed with water is best described by the polarity concept.
What is polarity?Polarity is a phenomena by which the dissolving power of any molecule can be known if they are polar will completely dissociate in water and if non polar will partially dissociate in water
Here chlorine is very poorly dissolve in water due to its non polar nature and water is polar. Some compounds are polar for short time of period and attend a partially positive and a partially negative charge within them.
Therefore, Cl2 is a non polar compound describes the polarity.
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If butane had a volume of 500 mL. at a pressure of 1.5 atm and a temperature of
20 °C, what would the new volume of the gas be at a temperature of 30 °C and a pressure
of 500 Torr
Question:
If butane had a volume of 500 ml. at a pressure of 1.5 atm and a temperature of 20 °C, what would the new volume of the gas be at a temperature of 30 °C and a pressure of 500 Torr?
Solution Given:
Let P be the pressure V be volume and and T be temperature.
Volume of Butane [[tex]V_1[/tex]] = 500 ml
Pressure of Butane [[tex]P_1[/tex]] = 1.5 atm
Temperature [[tex]T_1[/tex]] =20°C=20+273=293K
New Volume of Butane [[tex]V_2[/tex]] = ?
New Pressure of Butane [[tex]V_2[/tex]] =500 Torr=500*0.00131579=0.657895 atm
Note: 1 Torr= 0.00131579 atm
New Temperature of Butane [[tex]V_2[/tex]] =30°C=30+273=303K
Now
By using combined gas law equation:
[tex]V_2=V_2*\frac{P_1*T_2}{P_2*T_1}[/tex]
[tex]V_2=500*\frac{1.5*303}{0.657895*293}=1178.9 ml[/tex]
The new volume of Butane is 1178.9 ml
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What is the molar solubility of aluminum hydroxide, Al(OH)3, if Ksp for Al(OH)3 is 3.0 × 10−34?
AL(OH)3 (s) ⇌ AL3+ (aq) + 3OH- (aq)
Answer:
3.0×10⁻¹³ M
Explanation:
The solubility product Ksp is the product of the concentrations of the ions involved. This relation can be used to find the solubility of interest.
EquationThe power of each concentration in the equation for Ksp is the coefficient of the species in the balanced equation.
Ksp = [Al₃⁺³]×[OH⁻]³
Solving for [Al₃⁺³]The initial concentration [OH⁻] is that in water, 10⁻⁷ M. The reaction equation tells us there are 3 OH ions for each Al₃ ion. If x is the concentration [Al₃⁺³], then the reaction increases the concentration [OH⁻] by 3x.
This means the solubility product equation is ...
Ksp = x(10⁻⁷ +3x)³
For the given Ksp = 3×10⁻³⁴, we can estimate the value of x will be less than 10⁻⁸. This means the sum will be dominated by the 10⁻⁷ term, and we can figure x from ...
3.0×10⁻³⁴ = x(10⁻⁷)³
Then x = [Al₃⁺³] will be ...
[tex][\text{Al}_3^{\,+3}]=\dfrac{3.0\times10^{-34}}{10^{-21}}\approx \boxed{3.0\times10^{-13}\qquad\text{moles per liter}}[/tex]
We note this value is significantly less than 10⁻⁷, so our assumption that it could be neglected in the original Ksp equation is substantiated.
__
Additional comment
The attachment shows the solution of the 4th-degree Ksp equation in x. The only positive real root (on the bottom line) rounds to 3.0×10^-13.
Equilibrium constant for the reaction is
[tex]\sf K_{sp}=[Al^{3+}][OH^-]^3[/tex]
Let [Al³+] be s[OH-] is 10^{-7}So
[tex]\\ \rm\Rrightarrow s=\dfrac{3.0\times 10^{-34}}{(10^{-7})^3}[/tex[
[tex]\\ \rm\Rrightarrow s=\dfrac{3.0\times 10^{-34}}{10^{-21}}[/tex]
[tex]\\ \rm\Rrightarrow s=3.0\times 10^{-13}M[/tex]
The formation of protons over neutrons (thus producing about a 7:1 ratio) was favored in the early universe because:____.
a. it takes more energy to create a proton from a neutron than a neutron from a proton. b. it takes more energy to create a neutron from a proton than a proton from a neutron. c. the more massive neutrons made better targets for nucleon collisions. d. the positively charged protons were repelled away from the explosion.
Because it requires more energy to create a neutron from a proton than it does to create a proton from a neutron, protons were formed more frequently than neutrons in the early universe. The correct answer is option b.
To find the answer, we need to know more about the early universe.
How the formation of proton over neutrons was favored in the early universe?A neutron is produced with greater energy than a proton. However, later on, some of the protons were changed into neutrons. Contrary to some claims, the proton is a stable particle that never decays, but the neutron is unstable outside of the nucleus and decays with a half-life of around 10.5 minutes. However, very few would have had time to decay on the timeline you mention in your question. Every matter particle should have been accompanied by an antimatter particle, and every proton, neutron, and electron, by an anti-neutron and a positron, respectively. Where did all the antimatter go is the great mystery. There have been a few attempts to explain this, but they have failed.Thus, we can conclude that, the correct answer is option b.
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If an ideal solution contains 3. 50 mol of a non-volatile solute and 15. 8 mol of solvent, and it has a vapor pressure of 22. 6 torr, what is the vapor pressure of the pure solvent (in torr)?
The vapour pressure of the solvent is 28.25 torr.
Raoult's law is a physical chemistry relationship with consequences for thermodynamics. The theory, put out by French chemist François-Marie Raoult in 1887, asserts that the partial pressure of each component of an ideal mixture of liquids is equal to the vapor pressure of the pure component (liquid or solid) multiplied by its mole fraction in the mixture. As a result, the mole fraction of the solute in the solution is equal to the relative decrease in vapor pressure of a diluted solution of a nonvolatile solute.
According to Raoult's law, p = p⁰ × x
Where,
p = partial vapour pressure of the solvent
p⁰ = vapour pressure of the solvent
x = mole fraction of solvent
The mole fraction of the pure solvent = 15 .8 /19.3
= 0.81
Substitute values in the above expression,
p = p⁰ × x
22.6 = p⁰ × 0.8
p⁰ = 28.25 torr
Therefore, the vapour pressure of the solvent is 28.25 torr.
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A student sets up the following equation to convert a measurement.
(The ? stands for a number the student is going to calculate.)
Fill in the missing part of this equation.
Note: your answer should be in the form of one or more fractions multiplied together.
Answer:
[tex]\frac{1 kJ}{1,000 J}[/tex] · [tex]\frac{1,000 mmol}{1 mol}[/tex]
Explanation:
The final answer has a different set of units. In particular, millimoles (mmol) changes to moles (mol) and joules (J) changes to kilojoules (kJ). To make this change, you need to multiply the first value by proportions.
When writing these proportions, it is important that they are arranged in a way that allows for the cancellation of units. For instance, since J is located in the numerator, it must be located in the denominator of the conversion. Furthermore, since mmol is located in the denominator, it must be located in the numerator of the conversion.
Proportions:
1,000 J = 1 kJ
1,000 mmol = 1 mol
The full expression:
[tex]-1.3*10^4\frac{J}{mmol*^oC}[/tex] · [tex]\frac{1 kJ}{1,000 J}[/tex] · [tex]\frac{1,000 mmol}{1 mol}[/tex] = [tex]? \frac{kJ}{mol*^oC}[/tex]As you can see, the old units cancel out and you are left with kJ in the numerator and mol in the denominator.
The tetrahedral structure that forms the backbone of all silicate minerals is composed of silicon and what other element?
The tetrahedral structure that forms the backbone of all silicate minerals is composed of silicon and option(b) i.e, oxygen
The tetrahedron-shaped silica chemical structure. It comprises a core silicon atom that connects with four oxygen atoms on both sides. The tetrahedron-shaped geometric figure that is drawn around this configuration has four sides, each of which is an equilateral triangle.
Silicon and oxygen make up the silica tetrahedron, which serves as the base for all silicate crystals. In all sorts of rocks and everywhere in the world, the mineral quartz, SiO2, is formed. In deposited rocks, it manifests as sand grains, in igneous and metamorphic rocks, as crystals, and in veins that cut through all different types of rocks. These veins occasionally contain gold or other precious metals. It is widely known that up until the late 1700s, it was simply known as rock crystal. Quarts belong to a class of minerals known as silicates, all of which include silicon and oxygen in varying amounts. The majority of the minerals in the crust of the planet are silicates, and most estimates place 97 percent of the mantle and 95 percent of the crust in the crust.
The complete question is:
The silica tetrahedron that forms the backbone of all the silicate minerals is composed of silicon and what other element?
a. magnesium c. iron
b. oxygen d. carbon
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How many grams of calcium chloride are needed to produce 10. 0 g of potassium chloride?
cacl2( aq) k2co3( aq) → 2kcl( aq) caco3( aq)
Answer:
7.44 grams CaCl2 will produce 10.0 grams KCl.
Explanation:
The equation is balanced:
I've repeated it here, with the elements corrected for their initial capital letter.
CaCl2( aq) K2CO3( aq) → 2KCl( aq) CaCO3( aq)
This equation tells us that 1 mole of CaCl2 will produce 2 moles of KCl.
If we want 10.0g of KCl, we need to convert that mass into moles KCl by dividing by the molar mass of KCl, which is 74.55 grams/mole.
(10.0 grams KCl)/(74.55 grams/mole) = 0.1341 moles of KCl.
We know that we'll need half that amount of moles CaCl2, since the balanced equation says we'll get twice the moles KCl for every one mole CaCl2.
So we'll need (0.1341 moles KCl)*(1 mole CaCl2/2moles KCl) = 0.0671 moles CaCl2.
The molar mass of CaCl2 is 110.98 grams/mole.
(0.0671 moles CaCl2)*(110.98 grams/mole) = 7.44 grams CaCl2
7.44 grams CaCl2 will produce 10.0 grams KCl.
(c) If both ovaries are removed, how will it affect the female reproductive systems?
If both ovaries are removed, then the individual is unable to produce ovules and experiences menopause.
What are ovaries?The ovaries are two reproductive organs in women which act to generate germinal female cells known as ovules.
The absence of these organs (ovaries) leads to a stage known as menopause and the individual cannot produce sex hormones such as estrogen and progesterone.
In conclusion, if both ovaries are removed, then the individual is unable to produce ovules and experiences menopause.
Learn more about the ovaries here:
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