The reactant [tex]O_{2}[/tex] is limiting if we begin with 9. 50 grams of al and 9. 50 grams of [tex]O_{2}[/tex] .
The reactant whose number of moles is present in less quantity is called limiting reactant .
Calculation,
Given mass of Aluminium and oxygen
Mass of Aluminium = 9. 50 grams
and Mass of oxygen = 9. 50 grams
Number of moles of aluminium = given mass / molar mass of aluminium
Number of moles of aluminium = 9. 50 grams/ 26.99 = 0.351 mole
Number of moles of oxygen = given mass / molar mass of oxygen
Number of moles of oxygen = 9. 50 grams/ 31.999 = 0.296 mole
The reactant [tex]O_{2}[/tex] is limiting because oxygen present in less quantity or in limiting quantity and consume rapidly.
Therefor , the reactant [tex]O_{2}[/tex] is limiting if we begin with 9. 50 grams of al and 9. 50 grams of [tex]O_{2}[/tex] .
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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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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.
A 0.200 M solution of a weak acid, HA, is 9.4% ionized. Using this information, calculate Ka for HA.
Select one:
a.
9.4 × 10−3
b.
1.8 × 10−3
c.
1.9 × 10−2
d.
3.8 × 10−3
[tex]{ \qquad\qquad\huge\underline{{\sf Answer}}} [/tex]
Let's solve ~
Initial concentration of weak acid HA = 0.200 M
and dissociation constant ([tex]{ \alpha} [/tex]) is :
[tex]\qquad \sf \dashrightarrow \: \alpha = \frac{dissociation \: \: percentage}{100} [/tex]
[tex]\qquad \sf \dashrightarrow \: \alpha = \frac{9.4}{100} = 0.094[/tex]
Now, at initial stage :
[tex] \textsf{ Conc of HA = 0.200 M} [/tex][tex] \textsf{Conc of H+ = 0 M} [/tex][tex] \textsf{Conc of A - = 0 M} [/tex]At equilibrium :
[tex] \textsf{Conc of HA = 0.200 - 0.094(0.200) = 0.200(1 - 0.094) = 0.200(0.906) = 0.1812 M} [/tex][tex] \textsf{Conc of H+ = 0.094(0.200) = 0.0188 M} [/tex][tex] \textsf{Conc of A - = 0.094(0.200) = 0.0188 M} [/tex]Now, we know :
[tex]\qquad \sf \dashrightarrow \: { K_a = \dfrac{[H+] [A-]}{[HA]}} [/tex]
( big brackets represents concentration )
[tex]\qquad \sf \dashrightarrow \: { K_a = \dfrac{0.0188×0.0188}{0.1812}} [/tex]
[tex]\qquad \sf \dashrightarrow \: { K_a = \dfrac{0.00035344}{0.1812}} [/tex]
[tex]\qquad \sf \dashrightarrow \: { K_a \approx 0.00195 } [/tex]
[tex]\qquad \sf \dashrightarrow \: {K_a \approx 1.9 × {10}^{-3} } [/tex]
According to the problem, we have a 0.200 M solution of a weak acid HA that is 9.4% ionized. To find the Ka (acid dissociation constant) for HA, we can use the percent ionization formula:
[tex]\sf \% \: ionization = \dfrac{[H+]}{[HA]initial \times 100}[/tex]From this formula, we know that [H+] (the concentration of hydrogen ions) is equal to 9.4% of [HA]initial, and [HA]initial is equal to the initial concentration of the weak acid, which is 0.200 M. Solving for [H+], we get:
[tex]\sf [H+] = 0.094 \times 0.200 \: M = 0.0188\: M[/tex]Now we can use the equation for Ka:
[tex]\sf Ka = \dfrac{[H+][A-]}{[HA]}[/tex]We don't know the concentration of the conjugate base (A-) at this point, but we can assume that it is equal to [H+] because the weak acid is only slightly ionized. Therefore, we can substitute [A-] = [H+] = 0.0188 M into the equation and solve for Ka:
[tex]\sf Ka = \dfrac{(0.0188)^2}{(0.200 - 0.0188)} = \bold{1.8 \times 10^{-3}}[/tex]
So the answer is [tex]\bold{ B.\: 1.8 \times 10^{-3}}[/tex].
I hope this helps!
Olive oil and butter both contain fats; however, olive oil is liquid at room temperature and butter is solid. Why?.
Double bonds found in unsaturated fats form structures that stop tightly bound formations.
The arrangement of the phospholipids in the bilayer cell membrane depends on features of the phospholipid head and tails.
What are saturated and unsaturated fatty acids ?Unsaturated fatty acids have at least one double bond in the fatty acid chain while saturated fatty acids have no double bonds between the individual carbon atoms. Unsaturated fats are typically liquid and come from plant sources, whereas saturated fats are typically solid at room temperature
Animal fats, palm oil, and other sources of saturated fats are available. Plant and vegetable oils are sources of unsaturated fatty acids,Consuming healthy fats instead of saturated fat can also aid in preventing insulin resistance, a condition that precedes diabetes. Since unsaturated fat continues to be the healthiest type of fat, saturated fat may not be as bad as previously believedLearn more about Fatty acids here:
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A(n) ________ is a fixed number of atoms held together by chemical bonds in a certain spatial arrangement.
Answer:
Molecule
Explanation:
Could someone explain this sentence for me ?
Answer:
Explanation:
to put this plainly after putting strong electrolytes in water they dissolve to nothing but ions they give you an example and definition of a strong electrolyte I suggest you read those and see if you come up with what I gave you they also tell you that not all strong electrolytes dissolve as strongly as others that are in the example.
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.
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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Write 3–4 sentences to describe how coupling reactions are used to drive an unfavorable chemical reaction.
The concept of coupling reactions can be more understood knowing that Gibbs free energy is a state function. State function is a property that does not depend on the path taken to arrive to that value
What is Coupling reaction ?
A reaction where the the free energy of a thermodynamically favorable transformation, such as the hydrolysis of ATP, and a thermodynamically unfavorable one, are mechanistically joined into a new reaction (or may be envisaged to be so joined) is known as a coupled reaction.
How do you make an unfavorable reaction favorable?
Chemically unfavorable means non-spontaneous which means Gibbs' free energy change (ΔG) is positive, i.e. ΔG>0.
But we know that ΔG=ΔH−TΔS. Now ΔH and ΔS (enthalpy and entropy change, respectively) are state functions. So ΔG is also a state function.
Catalysts can only change the pathway of a reaction (in most of the cases, by lowering the activation energy of the reaction (Ea)) but after using the catalysts also, the energy states of the reactants and products don't alter. So ΔH and ΔS remain the same as uncatalysed reaction. So ΔG also doesn't change at all. So if the reaction is non-spontaneous, it remains like that.
That means, the thermodynamically unfavorable reaction can't be made favorable by introducing a catalyst.
But changing the temperature to a very high value can make ΔG<0, so the reaction can be made favorable by abruptly increasing temperature.
What are favorable and unfavorable reactions?
Reactions that release energy are energetically favorable. Conversely, reactions in which the products are higher in energy than the reactants require an input of energy to proceed; such reactions are energetically unfavorable
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if there are 12 moles of hydrogen how many moles of nitrogen are needed to react completely with the hydrogen? (N2(g)+3H2(g)->2NH3(g))
Answer:
Explanation:
Take a look at the balanced chemical equation for this synthesis reaction
N
2(g]
+
3
H
2(g]
→
2
NH
3(g]
Notice that you have a
1
:
3
mole ratio between nitrogen gas and hydrogen gas. This means that, regardless of how many moles of nitrogen gas you have, the reaction will always consume twice as many moles of hydrogen gas.
So, if you have
2
moles of nitrogen taking part in the reaction, you will need
2
moles N
2
⋅
3
moles H
2
1
mole N
2
=
6 moles H
2
This formula equation is unbalanced. pb(no3)2(aq) li2so4(aq) right arrow. pbso4(s) lino3(aq) which coefficient should appear in front of lino3 in the balanced equation?
The coefficient 2 should appear in front of [tex]LiNO_{3}[/tex] in the balanced equation
The chemical equation in which number of atoms in reactant side is equal to the number of atom in product side is called balanced chemical equation. The example of balanced equation is given as,
[tex]Pb(NO_{3} )_{2} (aq) + Li_{2} SO_{4} (aq)[/tex] → [tex]2Li(NO_{3} ) (aq) + Pb SO_{4} (aq)[/tex]
In the above equation, 2 is appear in front of [tex]LiNO_{3}[/tex] in the balanced equation which is known as the coefficient.
The symbolic representation of the chemical reaction is called chemical equation.
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Answer: 2
Explanation:
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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What process is used to determine if an acid-alkali neutralization is complete? a. titration b. bronsted-lowry neutralization c. arrhenius neutralization d. filtration
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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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
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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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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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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How does the body structure of each of these organisms contribute to a particular function?
body structure: the shape of specific organs/attributes of an organism. This includes cells, tissues, organs, and systems.
function: the action or purpose an organ or attribute has.
ExamplesBody structure
Function
Teeth allow organisms to chew food so that it is easier to digest and/or rip food.Certain skin patterns/colors may help an organism camouflage in its surrounding enviornmentCan't Touch ThisSpiny KatydidWhat is a body structure of the Spiny Katydid?
Spines on the body
What is the function of this structure?
The spines on the Spiny Katydid's body prevent predators from having an easy time eating them
Further Notes:
Without the spines on their body, Spiny katydids would be more vulnerable to being eaten. The spines help them survive
Blow on Your FoodLonghorn CowfishWhat is a body structure of the Longhorn Cowfish?
puckered mouth
What is the function of this structure?
The puckered mouth allows the Longhorn Cowfish to blow jets of water.
Further Notes:
The jets of water the Longhorn Cowfish blows move the sand, exposing the organisms it eats. Without the puckered mouth, the Longhorn Cowfish would have difficulty finding food.
Night VisionTarsierWhat is the body structure of the Tarsier?
Huge eyes
What is the function of this structure?
The Tarsier's huge eyes allow it to see well.
Further Notes:
It's excellent vision helps it see and hunt for prey
Key Termsbody structure
function
(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.
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How many grams of water are made from the reaction of 16.0 grams of o2? given the reaction: 2h2 o2 --> 2h2o
Answer:
18.0 g H₂O
Explanation:
To find the mass of water (H₂O), you need to (1) convert grams O₂ to moles O₂ (via the molar mass), then (2) convert moles O₂ to moles H₂O (via mole-to-mole ratio from equation coefficients), and then (3) convert moles H₂O to grams H₂O (via the molar mass). It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the sig figs of the given value.
Molar Mass (O₂): 2(15.998 g/mol)
Molar Mass (O₂): 31.996 g/mol
Molar Mass (H₂O): 2(1.008 g/mol) + 15.998 g/mol
Molar Mass (H₂O): 18.014 g/mol
2 H₂ + 1 O₂ -----> 2 H₂O
16.0 g O₂ 1 mole 2 moles H₂O 18.014 g
--------------- x ---------------- x --------------------- x ----------------- = 18.0 g H₂O
31.996 g 1 mole O₂ 1 mole
You are working in a lab on your magnetic levitation experiment. you are standing directly in front of two magnets. another scientist near you has a malfunction with their equipment and beta radiation is emitted directly at you, passing through the magnets first. you are wearing a lab coat and goggles. are you safe?
Yes, because magnets strongly deflect beta radiation, you wouldn't have been affected.
What should a lab do and not do?Guidelines for conduct in the science lab
Never consume food or beverages in a science lab.Avoid attempting to be a mad scientist.Avoid going into the lab without an adult present.Do put on appropriate clothing.Clean up the workspace and dispose of the trash.Do keep in mind where the emergency supplies are kept.Which method ensures lab safety?Avoid coming into contact with chemicals directly. Never taste, smell, or inhale lab chemicals. After taking off your gloves and before leaving the work area, wash your hands and arms thoroughly with soap and water. In a lab, never consume food or liquids, chew gum or tobacco, light up, or use cosmetics.learn more about lab safety here
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A solution is made by dissolving 42.3g of potassium hydroxide in 329g of water what is the molality of the solution?
Answer:
2.34 molality
Explanation:
Mole weight of KOH ( using periodic table ...rounded to 3 s.f.) =
56.1 gm/mole
Number of moles in 43.2 g
43.2 g / 56.1 gm / mole =.770 mole
molality = .770 mole / .329 kg = 2.34 m
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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A student weighs out 0. 0422 g of magnesium metal. The magnesium metal is reacted with excess hydrochloric acid to produce hydrogen gas. A sample of hydrogen gas is collected over water in a eudiometer at 32. 0°c. The volume of collected gas is 43. 9 ml and the atmospheric pressure is 832 mmhg. Using the experimentally collected data, calculate r and the percent error.
The value of r is 0.0868 and the error percentage is 5.78%.
The student weights 0.0422 grams of magnesium; thus, we may deduce that the magnesium he used is the mass of the magnesium over the additional mass, which is 0.024422.That is roughly equal to 0.001758.It also asserts that too much hydrochloric acid can react with magnesium, releasing hydrogen gas as a result.A sample of hydrogen gas is collected over water in a meter at a volume of 43.9 cc and a maximum pressure of 22 cc.To know more about this question, you can check:
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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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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 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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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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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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