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Which of these is the best conductor of electricity?
distilled water
salt water
carbonated water
sugar water
Answers
Answer:
Pretty sure its salt water, my apologies if its wrong
Explanation:
Answer:
Sugar water :) took the test lol
Explanation:
Related Questions
a geochemist in the field takes a small sample of the crystals of mineral compound from a rock pool lined with more crystals of . he notes the temperature of the pool, , and caps the sample carefully. back in the lab, the geochemist dissolves the crystals in of distilled water. he then filters this solution and evaporates all the water under vacuum. crystals of are left behind. the researcher washes, dries and weighs the crystals. they weigh .
Answers
Yes. Solubility is 0.070 kg/L
Solution:
Solubility = mass / Volume
Solubility = (0.210kg)/(3L) = 0.070 kg/L
Solubility is defined as the maximum amount of a substance that will dissolve in a specified amount of solvent at a specified temperature. Solubility is a characteristic property of a particular solute/solvent combination, and different substances have very different solubilities.
Adding sugar cubes to your tea or coffee is a common example of a solution. The ability of a sugar molecule to dissolve easily is called solubility. The term solubility can therefore be defined as the property of a substance to dissolve in a particular solvent. Water solubility is a measure of the amount of a chemical that can be dissolved in water at a given temperature.
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What is the angle of refraction?
Answers
Answer:
The answer is the angle made by a refracted ray with a perpendicular to the refracting surface.
Explanation:
A prism uses refraction to form a spectrum of colors from an incident beam of light.What is one major environmental issue that CFL have on the environment?
This has to do with elements and the electromagnetic spectrum
Answers
Answer:
CFLs (compact fluorescent lights) contain small amounts of mercury, a toxic heavy metal. If a CFL bulb breaks, the mercury can be released into the environment, where it can contaminate water and soil, and harm wildlife and human health. This is considered one of the major environmental issues associated with CFLs.
Silver bromide is the photosensitive material in 35 mm photographic film. When monochromatic light falls on film, the photons are recorded if
they contain sufficient energy to react with silver bromide in the film. The minimum energy needed to do this is approximately 57.9 kJ/mol. What
is the wavelength of this energy in nm?
Answers
The minimum energy needed by the photons to react with silver bromide in the film is approximately 57.9 kJ/mol. Then, the wavelength is 206 nm.
What is wavelength?Wavelength of a wave is the distance between two consecutive crests or troughs of the wave.
To find the wavelength of the energy in nm, we can use the equation:
E = hc/λ
where E is the energy in joules, h is Planck's constant (6.626 x 10⁻³⁴ J s), c is the speed of light (2.998 x 10⁸ m/s), and λ is the wavelength in meters.
First, we need to convert the energy from kJ/mol to J/photon:
57.9 kJ/mol = 57.9 x 1000 J/mol / 6.02 x 10²³ mol^-1
= 9.626 x 10²⁰ J/photon
Now we can use the equation above to find the wavelength:
9.626 x 10²⁰ J/photon = (6.626 x 10⁻³⁴ J s)(2.998 x 10⁸ m/s) / λ
Solving for λ, we get:
λ = hc/E = (6.626 x 10⁻³⁴ J s)(2.998 x 10^8 m/s) / 9.626 x 10⁻²⁰J/photon
= 2.06 x 10⁻⁷ m
Finally, we convert the wavelength from meters to nanometers:
λ = 2.06 x 10⁻⁷ m x (10⁻⁹ nm/m)
= 206 nm
Therefore, the wavelength of the energy needed to react with silver bromide in 35 mm photographic film is approximately 206 nm.
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27.20cm3 of a NaOH solution was titrated with 25cm3 of a 0.75mol/dm3 HNO3. What was the concentration of the NaOH solution
Answers
The Concentration of NaOH solution when NaOH solution was titrated with 25cm3 of a 0.75mol/dm3 HNO3 is 26.4 g/dm3.
Titration is a method of chemical analysis where the quantity of a sample's constituents is determined by adding a precisely measured amount of a different substance to which the desired constituent will react in a specific, known proportion.Given,
Volume of HNO3 is 25cm³ = 0.025 dm³
Amount of solute in mol = concentration in mol/dm3 × volume in dm3
Amount of HNO3 = 0.75 × 0.025 = 0.018 mol
The balanced equation is: NaOH(aq) + HNO3(aq) → NaNO3(aq) + H2O(l)
So the mole ratio NaOH:HNO3 is 1:1
Therefore 0.018 mol of NaOH reacts with 0.018 mol of HNO3.
Volume of sodium hydroxide solution 27.20cm³ =
0.027 dm³.
Concentration = 0.018 / 0.027 = 0.66 mol/ dm³
Relative formula mass of NaOH= 40
Mass = relative formula mass × amount
Mass of HCl = 40 × 0.66
= 26.4
So concentration = 26.4 g/dm3
Therefore, concentration of NaOH is 26.4 g/dm3
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The speed of light is .99*10^ 8 m/s . Change this to feet-per-minute (ft/min) 1 foot = 0.3048 m, 60.000 sec (exact)= 1 min Unrounded Answer = 5.88583 * 10 ^ 10 ft /min
Answers
Answer:
5.88583×10¹⁰ ft/min
Explanation:
From the question given above, the following data were obtained:
Speed of light (in m/s) = 2.99×10⁸ m/s
Speed of light (in ft/min) =.?
Next, we shall convert 2.99×10⁸ m/s to ft/s. This can be obtained as follow:
0.3048 m/s = 1 ft/s
Therefore,
2.99×10⁸ m/s = 2.99×10⁸ m/s × 1 ft/s / 0.3048 m/s
2.99×10⁸ m/s = 980971129 ft/s
Finally, we shall convert 980971129 ft/s to ft/min. This can be obtained as follow:
1 ft/s = 60 ft/min
Therefore,
980971129 ft/s = 980971129 ft/s × 60 ft/min / 1 ft/s
980971129 ft/s = 5.88583×10¹⁰ ft/min
Thus, 2.99×10⁸ m/s is equivalent to 5.88583×10¹⁰ ft/min
What happens to the temperature of copper when it melts?
Answers
Answer:
Copper encompasses a relatively low softening point, around 1075 degrees C. You'll dissolve little sums with a blowtorch. To soften sufficient for casting you'll require a heater of a few kind. This require be small more than some of tin cans.
Determine ΔG°rxn using the following information.
H2(g) + CO(g) → CH2O(g) ΔH°= +1.9 kJ; ΔS°= -109.6 J/K
+34.6 kJ
+57.7 kJ
-41.5 kJ
-30.8 kJ
+17.3 kJ
Answers
Rounded to the nearest tenth, the ΔG°rxn is approximately +34.6 kJ.
Therefore, the correct answer is +34.6 kJ.
To determine ΔG°rxn (the standard Gibbs free energy change) for the given reaction, you can use the equation:
ΔG°rxn = ΔH°rxn - TΔS°rxn
where ΔH°rxn is the standard enthalpy change and ΔS°rxn is the standard entropy change of the reaction, and T is the temperature in Kelvin.
Given:
ΔH°rxn = +1.9 kJ
ΔS°rxn = -109.6 J/K
Note that you need to convert the units to match (kJ and J/K).
Therefore, ΔS°rxn will be -0.1096 kJ/K.
Assuming the temperature is not provided, let's use a standard temperature of 298 K.
ΔG°rxn = +1.9 kJ - (298 K * -0.1096 kJ/K)
ΔG°rxn = +1.9 kJ + 32.6208 kJ
ΔG°rxn = 34.5208 kJ
Rounded to the nearest tenth, the ΔG°rxn is approximately +34.6 kJ.
Therefore, the correct answer is +34.6 kJ.
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The car has a rechargeable battery to drive it’s motor. The rechargeable battery provided a potential difference of 330 volts and can store up to 64 mega Jules it takes 8 hours for the battery to receive a full charge assume that the charging process is 100% efficient calculate the total charge the flows while the battery is being charged
Answers
The total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.
To calculate the total charge that flows while the battery is being charged, we can use the relationship between electrical energy, potential difference, and charge.
The electrical energy (E) stored in the battery is given as 64 mega Jules (64 MJ). The potential difference (V) provided by the battery is 330 volts. We know that the energy (E) is equal to the product of the potential difference (V) and the charge (Q):
E = V * Q
Since the charging process is 100% efficient, all the electrical energy supplied is stored in the battery. Therefore, we can rearrange the equation to solve for the charge (Q):
Q = E / V
Substituting the given values, we have:
Q = 64 MJ / 330 V
To perform the calculation, we need to convert mega Jules (MJ) to joules (J) since the SI unit of energy is joules. One mega Joule is equal to 1 million joules:
Q = (64 * 10^6 J) / 330 V
Calculating the division:
Q ≈ 193,939.39 Coulombs
Therefore, the total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.
This value represents the quantity of electric charge transferred during the charging process, and it indicates the amount of electricity that enters the battery.
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An element, X has an atomic number 45 and a atomic mass of 133.559 u. decay, with a half life of 68d. The beta particle is emitted with a kinetic energy of This element is unstable and decays by B 11.71MeV. Initially there are 9.41×10¹2 atoms present in a sample. Determine the activity of the sample after 107 days (in uCi).
Answers
The activity of the sample with a half life of 68d after 107 days (in uCi) is 0.0019635.
Half-life : It is defined as the time period in which the radioactivity of the given element is halved.
The activity of a sample is given by, A = λ N
where,
A is the activity of the sample
N is the number of radioactive nuclei present in the sample
λ is the decay constant, which is equal to 0.693/t₁/₂
t₁/₂ is the half-life period of the radioactive element
Conversion factor,1 Ci = 3.7 × 10¹⁰ Bq
1 Bq = 2.7 × 10⁻¹¹ Ci
Calculation :
Atomic number of element X = 45
Atomic mass of element X = 133.559 u
Number of atoms present initially, N₀ = 9.41 × 10¹²
Half-life of element X = 68 d
Initial kinetic energy, E = 11.71 MeV = 11.71 × 10⁶ eV = 1.87456 × 10⁻¹² J
Total time, t = 107 days = 107 × 24 × 60 × 60 s = 9.2544 × 10⁶ s
Number of half-lives, n = t/t₁/₂ = (9.2544 × 10⁶)/ (68 × 24 × 60 × 60) = 6.7
N = N₀ / 2ⁿ = (9.41 × 10¹²)/2⁶.7 = 7.14 × 10⁹
Radioactive decay constant, λ = 0.693 / t₁/₂ = 0.693 / 68 = 0.01019
Activity of the sample after 107 days,
A = λ N = 0.01019 × 7.14 × 10⁹= 7.27 × 10⁷ Bq = 1.9635 × 10⁻³ uCi (unit conversion has been done)
= 0.0019635 uCi
Therefore, the activity of the sample after 107 days (in uCi) is 0.0019635.
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You can calculate the mechanical energy of an object by _____.
A. first calculating its thermal energy
B.adding its chemical energy and its electrical energy
C. subtracting its potential energy from its kinetic energy
D. combining its potential energy with its kinetic energy
Answers
Answer:
D - combining it's potential energy with it's kinetic energy
The current day periodic table is organized by
Answers
Answer:
Dmitri Mendeleev
Explanation:
Dmitri Mendeleev published the first recognizable periodic table in 1869, developed mainly to illustrate periodic trends of the then-known elements. He also predicted some properties of unidentified elements that were expected to fill gaps within the table. Most of his forecasts proved to be correct
Answer:
Mendeleev periodic table
Explanation:
In 1869, just five years after John Newlands put forward his
Law of Octaves, a Russian chemist called Dmitri Mendeleev
published a periodic table. Mendeleev also arranged the
elements known at the time in order of relative atomic mass
Which statement is true of the particles that make up a substance?
A. Particles in a liquid have more energy than particles in a gas.
B. Particles in a solid have more energy than particles in a gas.
C. Particles in a gas have more energy than particles in a liquid.
D. Particles in a liquid and particles in a solid have the same amount
of energy
Answers
Answer:B
Explanation:
the particles in a gas are more far apart and have more kinetic energy than liquid because they are more close together and have less kinetic energy than gas.
Diffusion in Solids It is desired to calculate the rate of diffusion of CO₂ gas in air through a loosely packed bed of sand at 276K and a total pressure of 1 atm. The bed depth is 1.25 m and the void fraction e is 0.3. The partial pressure of CO₂ at the top of the bed is 2.026 x 10' Pa and 0 Pa at the bottom. Assume equimolar counterdiffusion of CO₂ and air. Use a t of 1.87. DAB-0.142×10 m²/s.
Answers
the rate of diffusion of CO₂ gas in air through the bed of sand is approximately 2.304 × 10^-6 mol/(m²·s).
To calculate the rate of diffusion of CO₂ gas in air through a bed of sand, we can use Fick's law of diffusion:
J = -DAB (dC/dx)
where J is the molar flux of CO₂, DAB is the diffusion coefficient of CO₂ in air, and (dC/dx) is the concentration gradient of CO₂ in the direction of diffusion.
To calculate the concentration gradient, we can use the following equation:
(dC/dx) = (ΔC/Δx)
where ΔC is the difference in partial pressure of CO₂ between the top and bottom of the bed, and Δx is the bed depth.
We are given that the bed depth is 1.25 m and the void fraction is 0.3, which means that the volume of the bed is:
V = (1 - e) A L
where A is the cross-sectional area of the bed and L is the bed depth. Assuming a circular cross-section, we can calculate the area as:
A = π (d/2)²
where d is the diameter of the bed. We are not given the diameter, so we cannot calculate the area.
However, we are given the partial pressure of CO₂ at the top and bottom of the bed, as well as the diffusion coefficient and temperature. We can use these values to calculate the molar flux of CO₂ using Fick's law of diffusion.
First, we need to convert the diffusion coefficient to the appropriate units:
DAB = 0.142 × 10^-9 m²/s
Next, we can calculate the concentration gradient:
ΔC = 2.026 × 10^4 Pa - 0 Pa = 2.026 × 10^4 Pa
Δx = 1.25 m
(dC/dx) = (ΔC/Δx) = (2.026 × 10^4 Pa/1.25 m) = 1.6208 × 10^4 Pa/m
Finally, we can calculate the molar flux of CO₂:
J = -DAB (dC/dx) = -(0.142 × 10^-9 m²/s) (1.6208 × 10^4 Pa/m) = -2.304 × 10^-6 mol/(m²·s)
The negative sign indicates that the molar flux of CO₂ is in the opposite direction of the concentration gradient, which is expected for equimolar counterdiffusion.
Therefore, the rate of diffusion of CO₂ gas in air through the bed of sand is approximately 2.304 × 10^-6 mol/(m²·s).
The reaction conditions for a specific reaction, bcd ha ⟶⟶ abcdh, are correct, but the reaction does not occur. what could be the reason?
Answers
The reason for the reaction does not occur is the orientation of the molecule formed with respect to each other is not correct for the reaction to occur
ORIENTATIONIn chemical reaction the collision between the atom, the reactant molecules must collide with favorable orientation ensure the direct contact between the atom that involved in breaking and forming the bond.
ORIENTATION OF THE MOLECULEThe extension of macromolecule, the structural units along the fiber axis that determines the sorption of solvent, tensile strength, optical behaviors and modulus
Hence, the reason for that reaction does not occur is the orientation of the molecule formed with respect to each other is not correct for the reaction to occur.
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Which interaction occurs when light goes into an object as heat energy?
A. Absorbed light
B. Bright light
C. Reflected light
D. Refracted light
Answers
Interaction occurs when light goes into an object as heat energy is Absorbed light.
Absorbed light makes an object dark. Absorption of light is when the light is absorbed by the object and converts it into heat energy. The objects converts the wavelength of light into the larger wavelength of heat. this makes the object warmer and produced energy. Absorption depends on the frequency of light that is transmitted. The wavelength of light defined as the distance between the the two successive troughs of the the light wave.
Therefore, Interaction occurs when light goes into an object as heat energy is Absorbed light.
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Next to a shallow cylindrical lake with a radius of 4km and an average water height of 5m, a type A exhaust basin has been installed, which recorded a total water loss of 4.5cm during a summer month. It is requested to calculate the evaporation of the lake and the volume of the lake water in cubic meters for the specific time period if the coefficient of the evaporation basin is equal to 0.7
Answers
In a shallow cylindrical lake with a radius of 4 km and an average water height of 5 m, a type A exhaust basin recorded a total water loss of 4.5 cm during a summer month.
The task is to calculate the evaporation of the lake and the volume of lake water in cubic meters for that specific time period, assuming an evaporation coefficient of 0.7. To calculate the evaporation of the lake, we first convert the recorded water loss from centimeters to meters. The total water loss is 4.5 cm, which is equal to 0.045 meters.
The evaporation from the lake can be determined by multiplying the water loss by the evaporation coefficient. In this case, the evaporation coefficient is given as 0.7. So, the evaporation from the lake is calculated as:
Evaporation = Water loss * Evaporation coefficient
Evaporation = 0.045 m * 0.7 = 0.0315 m
Therefore, the evaporation of the lake during the specified time period is 0.0315 cubic meters.To calculate the volume of lake water, we need to consider the shape of the lake, which is a shallow cylinder. The formula for the volume of a cylinder is:
Volume = π * radius^2 * height
Given that the radius of the lake is 4 km (4000 m) and the average water height is 5 m, we can calculate the volume of the lake as:
Volume = π * (4000 m)^2 * 5 m = 251,327,412 m^3
Therefore, the volume of lake water for the specific time period is approximately 251,327,412 cubic meters.
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What is the theoretical yield of butan-2-one (shown) if 0.30 mL of butan-2-ol is treated with TEMPO and an excess of of TCCA and is completely oxidized? Your answer should be in grams and give only the number. Your answer should have at least 2 significant digits (2nd decimal place).
Answers
Answer:
Theoretical yield = 0.24 gram (Approx)
Explanation:
Given:
Butan-2-1
Molar mass(butan-2-ol) = 74.12 g/mol
Molar mass(butan-2-one) = 72.11 g/mol
Density of butan = 0.806 g/mol
Volume = 0.30 ml
Computation:
Mass of 2-butan = Density of butan × volume
Mass of 2-butan = 0.806 g/mol × 0.30 ml
Mass of 2-butan = 0.2418 g
Mass of product = Mass of 2-butan × [1 mol of butan-2-ol / 74.12] × [1 mol of butan-2-one / 1 mol of butan-2-ol] × [72.11 g/mol / 1 mol of butan-2-one]
Mass of product = 0.235 gram
Theoretical yield = 0.24 gram (Approx)
SEP Use Models Why does the number of electrons in each principal energy shell increase as the number of the shell increases?
Answers
Answer:
See explanation
Explanation:
The number of electrons in each principal energy shell increases as the number of shells increases because more electronic orbitals become available to accommodate the electrons.
For instance, the n= 2 level only accommodates eight electrons in the s and p orbitals whereas the n=3 level accommodates 18 electrons in s, p and d orbitals respectively.
Each principal level accommodates 2n^2 electrons where n= the principal energy shell.
The increase in the number of shell leads to increase in the number of electrons.
The number of electrons in each principal energy shell increase as the number of the shell increases because each cell can accommodate 8 electrons except the first shell which has only 2 electrons. The number of electrons increases when we go down the group due to addition of new shells.
The atom added new shells in the atom if the existing shells fill with electrons and no place is available for the remaining electrons so we can conclude that the increase in the number of shell leads to increase in the number of electrons.
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The interaction of aligned sp3 orbitals on adjacent atoms is _____________
It will ____________ (increase/decrease) the internal energy of a rotamer.
Answers
Answer: The interaction of aligned sp3 orbitals on adjacent atoms is called sigma orbitals. It can increase the internal energy of a rotamer.
Explanation:
The interaction of aligned sp3 orbitals on adjacent atoms is called σ-bonding. It occurs due to axial overlapping of sp3 orbitals.This interaction can increase the internal energy of a rotamer.
does baking soda make cake rise
Answers
Answer: Yes it can help make cake rise.
Explanation: Its a leavening agent and its a good ingredient for baking.
66 A student wants to design a controlled experiment to solve the following problem: When placed in a freezer, will hot water or cold water reach 0°C faster?
The student plans to place two containers with equal masses of water (one hot and one cold) in the same freezer in the classroom.
a List three conditions the student should keep constant for the hot-water and cold-water setups when planning this experiment. [3]
b For each condition you name, give a scientific reason why the condition needs to be the same for both the hot-water and cold-water setups
Answers
Answer:
Explanation:
is guiZ
Explain why a solution of calcium conducts electricity but solid calcium chloride does not
Answers
Answer:
because the ions arent firmly held in place!
Explanation:
What is transferred between a conjugate acid-base pair.
Answers
Answer:
Protons (Hydrogen Ions) transfer between conjugate acid-base pair.
Explanation:
what does the midpoint of the titration of a weak acid with a strong base correspond to?
Answers
In an acid – base titration, the titration curve reflects the strengths of the corresponding acid and base.
If one reagent is a weak acid or base and the other is a strong acid or base, the titration curve is irregular, and the pH shifts less with small additions of titrant near the equivalence point
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Please answer fast, I will give brainliest if correct!
Answers
Answer:
Explanation: 30 min
Why do lunar and solar eclipses not happen every month?
Answers
What is the formula for S2O5
Answers
Answer:
chemical formula
Explanation:
A student measures the mass of an 8 cm3 block of brown sugar to be 12.9 g. What is the density of the brown sugar?
Answers
Answer:
The answer is
1.61 g/cm³Explanation:
The density of a substance can be found by using the formula
\(density = \frac{mass}{volume} \)
From the question
mass = 12.9 g
volume = 8 cm³
The density of the block is
\(density = \frac{12.9}{8} \\ = 1.6125\)
We have the final answer as
1.61 g/cm³Hope this helps you
The mass number is used to calculate the number of___________ in one atom of an element. In order to calculate the number of neutrons you must subtract the ______________________ from the________
Answers
Answer:
Neutrons, Atomic Number, Atomic Mass
Explanation:
The Atomic mass is used to calculate the number of Neutrons in an atom.
Every atom is composed of Protons and Neutrons forming a tight compact nucleus orbited by electrons. The Atomic number of an element tells how many Protons the nucleus has. This is important because it determines how many electrons the atom has and consequently, its chemical properties. The Atomic mass (rounded to the nearest whole number) is the sum of the Protons and Neutrons in the elements nucleus, since their masses are nearly identical (Neutrons have one electron worth more mass than Protons). You subtract an element's Atomic number from its Atomic mass and you get the number of neutrons the element has in the nuclei of its atoms.