The element that doesn't occur in elemental state in nature is
Answers
Answer:
technetium, atomic number 43; promethium, number 61; astatine, number 85; francium, number 87; neptunium, number 93; and plutonium, number 94.
Explanation:
Related Questions
Select the answer that lists the radiation waves in order of increasing
energy
Gamma rays, Infrared, Radio waves
O Radio waves, X-rays, Ultraviolet
O
Visible light, Infrared, X-rays
O Microwaves, Ultraviolet, X rays
Answers
Answer:
Concept: Radiology & Chemistry
Energy waves are judged based on their wave length, which is measures from one "hump" to the next In order from least to greatest, aka increasing: Radio Waves, infrared waves, visible light, UV, x-Ray, and GammaGive brainlist and rate positivelywhat is the concentration of the iron (iii) ions in solution when 22.0 ml of 0.34 m sodium sulfide reacts with 53.0 ml of 0.22 m iron (iii) nitrate?
Answers
The concentration of iron (III) ions in the solution is 0.0705 M.
Finding the Concentration of a SolutionTo determine the concentration of iron (III) ions in the solution, we need to use the stoichiometry of the reaction between sodium sulfide (Na2S) and iron (III) nitrate (Fe(NO3)3) and the volumes and concentrations of the reactants.
The balanced equation for the reaction is:
2 Na2S + 3 Fe(NO3)3 → 6 NaNO3 + Fe2S3
From the equation:
2 moles of sodium sulfide react with 3 moles of iron (III) nitrate to form 1 mole of iron (III) sulfide.
2 moles Na2S + 3 moles Fe(NO3)3 = 1 mole Fe2S3
First, let's calculate the number of moles of sodium sulfide and iron (III) nitrate used in the reaction:
Moles of sodium sulfide = volume (in L) × concentration
= 0.022 L × 0.34 mol/L
= 0.00748 mol
Moles of iron (III) nitrate = volume (in L) × concentration
= 0.053 L × 0.22 mol/L
= 0.01166 mol
From the stoichiometry of the reaction, we can see that the mole ratio of sodium sulfide to iron (III) nitrate is 2:3. Therefore, the limiting reagent is sodium sulfide because there are fewer moles of sodium sulfide compared to iron (III) nitrate.
Since 2 moles of sodium sulfide react with 1 mole of iron (III) sulfide, we can calculate the moles of iron (III) sulfide formed:
Moles of iron (III) sulfide = (0.00748 mol Na2S) × (1 mol Fe2S3 / 2 mol Na2S)
= 0.00374 mol
Finally, we can determine the concentration of iron (III) ions (Fe3+) in the solution. Since 1 mole of iron (III) sulfide corresponds to 3 moles of Fe3+ ions, the concentration is:
Concentration of Fe3+ = moles of Fe3+ / volume (in L)
= (0.00374 mol) / (0.053 L)
= 0.0705 M
Therefore, the concentration of iron (III) ions in the solution is 0.0705 M.
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During a reaction, the enthalpy of formation of an intermediate is 90.3 kJ/mol. During the reaction, 2 moles of the intermediate are formed as a reactant. What is the enthalpy value for this step of the reaction?
A. -180.6 kJ
B. 90.3 kJ
C. -90.3 kJ
D. 180.6 kJ
Answers
Answer:
180.6 kJ
Explanation:
The enthalpy of reaction refers to the energy absorbed or released during a reaction. If heat is absorbed in a reaction, the enthalpy of reaction is positive. If heat is released in a reaction, the enthalpy of reaction his negative.
Since the energy absorbed when one mole of the intermediate is formed is 90.3 kJ/mol, then, when two moles of intermediate is formed, 2 × 90.3 kJ/mol = 180.6 kJ of energy is absorbed.
describe how water molecules can hydrate various substances
Answers
Answer:
Water molecules forming hydration shells around Na+ and Cl- ions. The partially positive ends of the water molecules are attracted to the negative Cl- ion, while the partially negative ends of the water molecules are attracted to the positive Na+ ion.
Explanation:
I got this from another source, I hope this helps tho!
what’s the density if the mass is 19 g and the volume is 25 mL
Answers
Answer:
density =mass/ volume
Explanation:
isn't this physics ...
so is the mass is 19 g and volume = 25 ml first convert to same units (g/cm3)
1ml = 1cm3
same units so no need to convert
19 divided by 25 = 0.76
0.76 g/cm3
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How many moles is 54.0g of oxygen gas(O2)?
Answers
Answer:
Approximately 3.375 moles.
Explanation:
1 mole of oxygen is about 15.9 grams. And if you divide 54 by 15.9, you get 3.375.
how many allylic halides (including stereoisomers) can be formed when 3-methylcyclohexene undergoes allylic halogenation with one equivalent of nbs, peroxide, and light?
Answers
When 3-methylcyclohexene undergoes allylic halogenation with one equivalent of NBS (N-bromosuccinimide), peroxide, and light, it can form two allylic halides.
The reaction involves the addition of a bromine atom to the allylic position of the alkene. The two possible products are formed by the addition of the bromine atom to the two different allylic carbons in the 3-methylcyclohexene molecule.
The two allylic halides that can be formed are:
1-Bromo-3-methylcyclohexene (with the bromine atom attached to the allylic carbon adjacent to the methyl group).
1-Bromo-1-methylcyclohexene (with the bromine atom attached to the allylic carbon adjacent to the non-methyl substituted carbon).
These two compounds are stereoisomers of each other since they have the same connectivity but differ in the spatial arrangement around the double bond.
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Minerals are all naturally occurring solid substances with a definable chemical composition. they also must possess _____________.
Answers
They must also possess a fixed crystalline structure (spatial arrangement of atoms and ions).
What are the properties of minerals?Color is one category, however it is not necessarily a reliable indicator of a mineral's identity. Numerous minerals can be found in a variety of colors, and many minerals contain additional compounds that give them a surprising color.The way a mineral reflects light is called luster. The characteristics of minerals include metallic, pearly, glassy, smooth, greasy, dazzling, or drab.When particular minerals cleave, they do so in a distinct manner.By observing how simple it is to scrape a mineral, hardness is determined.The chemical composition of each occurrence of a mineral varies within a narrow range, and the atoms that make up the mineral must exist in particular ratios.In a mineral, the atoms are arranged in a recurring, predictable pattern.
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What is the specific heat of an unknown metal of 2.93 kcal of energy are required to raise the temperature of 183.4g sample of the metal by 126.3 Celcius
Answers
Answer:
The specific heat of the unknown metal is 1.26*10⁻⁴ \(\frac{kcal}{g* C}\)
Explanation:
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat occurs when heat added or removed from a substance causes a temperature change in it and is calculated by:
Q = c * m * ΔT
Where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c and where ΔT (Tfinal - Tinitial) is the variation in temperature
In this case:
Q= 2.93 kcalc= ?m= 183.4 gΔT= 126.3 °CReplacing:
2.93 kcal= c* 183.4 g*126.3 °C
Solving:
\(c=\frac{2.93 kcal}{183.4 g* 126.3 C}\)
c= 1.26*10⁻⁴ \(\frac{kcal}{g* C}\)
The specific heat of the unknown metal is 1.26*10⁻⁴ \(\frac{kcal}{g* C}\)
A suspension of yeast supplied with glucose as its source of energy was transferred from an aerobic environment to an anaerobic one. Which result would you predict for the rate of glucose utilization and the rate of ethanol production after the transfer? assume that the yeast must expend the same amount of energy to survive in both environments.
Answers
After the transfer from aerobic to anaerobic environment the rate of ethanol production will increase and the rate of glucose utilization would decrease.
Why the rate of ethanol production increases and glucose is broken down?See when the yeast was pacing in aerobic environment that is in the presence of oxygen it does not grow with fast speed.When yeast is transferred to anaerobic environment it grows rapidly.In anaerobic environment yeast breaks down glucose.By breaking down glucose releases ethanol and an appreciable amount of CO2.That's why yeast grows rapidly in anaerobic environment comparatively.Expending the same amount of energy yeast survives the best in anaerobic environment.To know more about yeast visit:
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How are the concentrations of hydrogen ions and hydroxide ions related in an aqueous solution?
Answers
Arrhenius acid increases the concentration of hydrogen ion in an aqueous solution and Arrhenius base increases the concentration of hydroxide ion in an aqueous solution.
What is Arrhenius Acid and Base ?Arrhenius acid dissociates in aqueous solution to form hydrogen ion. In aqueous solution Arrhenius acid increases the concentration of hydrogen ions.
Arrhenius base dissociates in aqueous solution to form hydroxide ion. In aqueous solution Arrhenius base increases the concentration of hydroxide ions.
Hydrogen Ion \((H^+)\) and Hydroxide Ion \((OH^{-})\).In aqueous solution of hydroxide ions bases dissociates. Greater the concentration of base means greater the concentration of hydroxide ion. If hydroxide ion concentration is more then pH will be less.
Thus, we can say that Arrhenius acid increases the concentration of hydrogen ion in an aqueous solution and Arrhenius base increases the concentration of hydroxide ion in an aqueous solution.
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equivalent massof sodium
Answers
Answer:
Sodium
Formula : Na
Equivalent mass:23.0
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Does the ir spectrum allow you to confirm that the structure of the product is a combination of the two reactants?
Answers
Yes, the IR spectrum allow you to confirm that the structure of the product is a combination of the two reactants.
What is Spectrum?A spectrum is a state that can fluctuate without gaps across a continuum and is not constrained to a particular range of values. After passing through a prism, visible light takes on a rainbow of hues, which is how the term was initially used scientifically in optics.As knowledge of light increased on a scientific level, it started to encompass the full electromagnetic spectrum.As a result, it evolved into a mapping of a variety of magnitudes to a variety of qualities, including the perceived "colours of the rainbow" and other attributes that correspond to wavelengths outside of the spectrum.Today, analogies with spectrum are used to discuss subjects unrelated to optics.Learn more about spectrum here:
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Explain why the following structure is incorrect
Answers
Answer:
there is too many electrons around the shell
Explanation:
Oxygen has to bond to two other atoms so the C-O bond should be a double bond to fulfil both of their bonding rules.
Hydrogen can only bond to one other atom, therefore it cannot make a double bond so that bond must be a single bond. (Carbon there is also bonding to five atoms so changing it to a single bond will fulfil both of their bonding rules).
A volcano has no ____
only heat.
Answers
Answer:
A volcano has no friends only heat.
Explanation:
How many atoms of aluminum are in 4.9 mol of aluminum?
Answers
Answer:
8.14 mols al
Explanation:
How did we find out the nitroglycerin would also help people with weak hearts?
Answers
Answer:
The physician William Murrell was one of the first physicians to recognize the the clinical benefits of nitroglycerin in the treatment of the heart disease known as angina pectoris, a type of chest pain caused by reduced blood flow to the heart.
Explanation:
The physician William Murrell was one of the first physicians to recognize the the clinical benefits of nitroglycerin in the treatment of the heart disease known as angina pectoris, a type of chest pain caused by reduced blood flow to the heart. He also used nitroglycerin to treat and reduce high blood pressure. He used small diluted doses of nitroglycerin to treat patients with angina pectoris. Murrell published his treatment results in the article "Nitro-glycerine as a remedy for angina pectoris," in the journal The Lancet in 1879. Thereafter, the use of nitroglycerin as treatment procedure for angina pectoris soon became generally adopted by other physicians.
Nitroglycerin is a vasodilator which is a medicine that opens blood vessels in order to improve blood flow. Nitroglycerine acts to improve blood flow to the heart by opening up or dilating the coronary arteries in the heart, thereby reducing how hard the heart has to work in pumping blood round the body. It reduces preload by dilating veins and reduces afterload moderately by dilating arteries.
Nitroglycerin comes in two forms: quick-acting forms and long-acting forms.
The quick-acting forms include tablets or oral sprays.
Long-acting forms include pills, tablets, skin ointment, and skin patches.
150.0g of steam at 145°C would need to lose how many joules of energy to become a liquid at 98°C? How
many cal of energy would that be?
Answers
The amount of heat that would be given out is 14.1kJ.
What is the heat capacity?Heat capacity is a physical property that describes the amount of heat required to raise the temperature of a substance by one degree Celsius. We know that the heat capacity of steam is 2J/g/°C.
We can tell that;
H = mcdT
H = heat that is absorbed or evolved
m = mass of the object
c = Heat capacity of the object
dT = temperature change
Then we have that;
H = 150 * 2 * (98 - 145)
H = -14.1kJ This is the heart lost
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What does the result table indicate about the solute in this solution
Answers
The result table indicate that A. The solute is a SOLID because it has a DECREASE in the amount dissolved as temperature decreases.
What is describes solubility?The solubility of a solid solute in a liquid solvent generally decreases as the temperature decreases. This is because the kinetic energy of the solute molecules decreases as the temperature decreases. As the kinetic energy of the solute molecules decreases, they are less likely to have enough energy to escape from the solution and enter the gas phase.
In the table, as the temperature decreases, the concentration of the solute in the solution decreases. This indicates that the solute is a solid and that the solubility of the solute decreases as the temperature decreases.
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5. which of the following amines can be prepared by the gabriel synthesis? write the equations showing the successful applications of this method. (a) butylamine (b) isobutylamine (c) tert-butylamine (d) 2-phenylethylamine (e) n-methylbenzylamine (f) aniline
Answers
The amines (a) butylamine, (b) isobutylamine, (c) tert-butylamine, and (f) aniline can be prepared by the Gabriel synthesis. This method involves the reaction of potassium phthalimide with an alkyl halide, followed by hydrolysis of the resulting N-alkylphthalimide with strong base.
The amine product is then obtained by acidification.
The Gabriel synthesis is a well-known method for the preparation of primary amines. It involves the reaction of potassium phthalimide with an alkyl halide to form an N-alkylphthalimide intermediate, which is then hydrolyzed with strong base to form the corresponding primary amine.
The mechanism of the reaction involves the formation of an imide anion, which acts as a nucleophile and attacks the alkyl halide to form the N-alkylphthalimide. The N-alkylphthalimide is then hydrolyzed with strong base to form the primary amine.
The Gabriel synthesis is a useful method for the preparation of primary amines, including butylamine, isobutylamine, tert-butylamine, and aniline. The successful application of this method involves the reaction of potassium phthalimide with an alkyl halide, followed by hydrolysis of the resulting N-alkylphthalimide with strong base and acidification to obtain the primary amine product.
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In a plant, 1500kg of nitrogen oxide is consumed per day to produce 1,500 kg of nitrogen per day. What is the prevent yield?
Answers
Answer:
65.21 percent
Explanation:
We are to find the percentage yield
We have this equation,
2no+o2 -->2no2
Such that 1500 kilograms/30grams
= Mno2/46
=1500/30 = mno2/46
We cross multiply from here
1500x46 = 30xMnO2
69000 = 30Mno2
69000/30 = MnO2
2300 = Mno2
The percentage yield would be
1500/2300 *100
= 0.6521 x 100
= 65.21%
This answers the question
Explain why mass is used to measure the properties of solids, liquids, and gases.
Answers
Answer: Mass takes into account the force of gravity.
Explanation:
Electricity costs about 20 cents per kilowatt-hour. A kilowatt-hour is the amount of
energy used by running a 1000-watt (aka 1 kilowatt) device for 1 hour. If you leave your
100-watt lightbulb (0.1 kilowatts) on all the time, how much will it cost (in dollars) per
month?
Answers
The cost (in dollar) of running your 100 watt light bulb at the time per month is $ 14.4
How do i determine the cost of running the light bulb?First, we shall determine the energy consumed per month by the light bulb
Power (P) = 100 watts = 100 / 1000 = 0.1 KW Time (t) = 30 days = 30 × 24 = 720 hoursEnergy (E) =?E = Pt
E = 0.1 × 720
E = 72 KWh
Finally, we shall determine the cost of running the light bulb. Details below
Cost per KWh = 20 cents = 205 / 100 = $ 0.2Energy (E) = 72 KWhCost of running per month =?Cost = energy × Cost per KWh
Cost of running per month = 72 × 0.2
Cost of running per month = $ 14.4
Thus, we can conclude that the cost of running per month is $ 14.4
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10 uses of non-metals
Answers
Answer: 10 uses
Explanation:
1] Oxygen is used for breathing.
2] Chlorine is used for purifying water.
3] Phosphorous is used in crackers.
4] Non - metals like nitrogen is used in fertilizers.
5] Graphite is used as a good conductor of electricity.
6] Pottassium is used in fertilizers.
7] Nitrogen is used by plants.
8] Graphite is used in making leads.
9] Carbon is used as a fuel.
10] Bromine is used in dyes and pesticides
B. How do you think the physical properties (strength, flexibility, and viscosity) of the polymer would change if more borate had been added
Answers
It became thicker and its viscosity decreased and cannot flow as easily as before.
You ignite a chemical reaction by adding the borax solution to the glue mixture.
In a chemical reaction, the molecules of glue and borax combine to form a flexible, springy new substance. With rubber's vulcanization serving as a model, chemical cross-linking has been extensively employed to change the physical properties of polymeric materials.
Chemical links between polymer chains provide a substance with a more solid structure and perhaps a better-defined shape. It thickened and lost viscosity, making it more difficult to flow than it once could.
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Imagine you are looking at a bottle of salad dressing containing oil, vinegar, and water. Why are there two layers in the salad dressing? Water and vinegar are both hydrophobic and mix, whereas the oil is hydrophilic. Vinegar and oil are both hydrophobic and mix, whereas the water is hydrophilic. Water and vinegar are both hydrophilic and mix, whereas the oil is hydrophobic. Vinegar dissolves into both the oil and the water in this container.
Answers
Answer:
Oil and vinegar separate because it is a suspension
Explanation:
When you let suspensions sit the particles begin to layer out, in the salad dressing the oil layers out on top of the vinegar. The two layers of oil and vinegar don't actually dissolve in each other. The layer with the lower density (oil) floats on top of the layer with a higher density (vinegar)
Water and vinegar are both hydrophilic and mix, whereas the oil is hydrophobic. Oil and vinegar separate because it is a suspension
What is the difference between hydrophilic and hydrophobic molecules ?Hydrophilic molecule are water-loving polar molecule.
They interact with water or they are dissolved in water or water like polar solvent.
For instance, the phospholipid molecules of the plasma membrane has a hydrophilic phosphate group.
Hydrophobic is a water hating substance which can not dissolve in water, but other non-polar solvent.
Thus hydrophobic substances are lipophilic in nature and the hydrophobic solvents are used to separate water-immiscible substances from water.
The layers of oil and vinegar can not dissolve with each other. The oil layer has the lower density floats on top of the layer with a higher density product called vinegar.
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Do you think it is still possible for the Church today to imitate the ways of the early Christians? Give reason for your answer.
Answers
Answer:
Explanation:
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How are superheavy elements made?
Answers
Answer: Most methods for making new elements involve a cyclotron, which speeds up atoms to high velocities before they smash into other atoms—these atoms are usually of different elements. This causes the nuclei to combine, creating new heavier elements.
Explanation: How are superheavy elements made?
Which describes an example of ecological succession?
Answers
Answer:
b. a meadow replacing a pond in it's flood plain
Explanation:
I'ts a secondary succession.
Given the reaction at equilibrium: 2 CO (g) + O2 (g) <---> 2 CO2 (g)
When the reaction is subjected to pressure, the equilibrium will shift to the ______.
Select one:
a. the pressure can't be changed
b. no change will occur
c. left
d. right
Answers
When the reaction is subjected to pressure, the equilibrium will shift to the side with fewer gas molecules, which is the left side. Therefore, the answer is c. left.
According to Le Chatelier's principle, when a system at equilibrium is subjected to a change in pressure, it will respond by shifting in a way that reduces the effect of the change. In this case, increasing the pressure would cause the equilibrium to shift towards the side with fewer gas molecules to alleviate the increase in pressure.
Since there are fewer gas molecules on the left side of the reaction (2 CO + O2), the equilibrium will shift to the left to reduce the total number of gas molecules. This means that the concentrations of CO and O2 will increase, while the concentration of CO2 will decrease until a new equilibrium is established. Thus, the equilibrium will shift to the left.
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