The intermolecular force present in butter is London dispersion forces. In kerosene, covalent bonding between carbon and hydrogen atoms are present.
What is intermolecular force ?Intermolecular forces are force exerted between two molecules which can be of attraction or repulsion. The intermolecular force of attraction make the atoms binded in a compound or molecule.
In butter, the hydrocarbon molecules exerts a London dispersion forces between two non-polar molecules. In kerosene, the hydrocarbon molecules are bound by covalent bonding between carbon atoms.
In ethanol, the OH group make it possible to form hydrogen bonds between ethanol molecules. In the case of calcium fluoride, dipole, dipole forces exists. Since the compound is ionic and have a permanent dipole moment.
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Atoms disappear during a chemical change true or false
Answer:
False
Explanation:
In a chemical reaction, only the atoms present in the reactants can end up in the products.
No new atoms are created, and no atoms are destroyed.
In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.
If the temperature of a cup of coffee decreases from
60.0°C to 25.0°C, what is the decrease in temperature in
units of degrees Celsius and kelvin?
To convert from Celsuis to Kelvin, add 273 or vice versa to convert from Kelvin to Celsuis.
So 60 Celsius + 273 = 333K
and 25 + 273 = 298K
Therefore we can see the decrease in temperature in units of degrees and Celsuis is 35.
Determine the number of atoms in 29.0
grams of sodium, Na. (The mass of one
mole of sodium is 22.99 g.)
The number of atoms in 29.0grams of sodium, Na is 7.58 × 10²³ atoms.
How to calculate number of atoms?The number of atoms of a substance can be calculated by multiplying the number of moles in the substance by Avogadro's number; 6.02 × 10²³.
no of atoms = no of moles × 6.02 × 10²³
According to this question, there are 29.0 grams of sodium (Na). The number of moles can be calculated as follows:
moles = 29.0g ÷ 22.99g/mol = 1.26mol
No of atoms = 1.26 mol × 6.02 × 10²³
no of atoms = 7.58 × 10²³ atoms
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Consider the reaction.
MnS(s)+2HCl(aq)⟶MnCl2(aq)+H2S(g)
If the small amount of MnS is combined with the large amount of HCl, what is the mass of the products? The mass of any excess reactants will also be included in this total.
Mass of Empty flask - 400g
Mass Empty beaker- 250g
Mass of small amount flask- 404.35g
Mass of large amount flask - 408.70g
Mass of small amount beaker- 300g
Mass of large amount beaker -350
Mass of Small amount flask and large amount beaker = 504.35g
Mass of Large amount flask and small amount beaker = 458.70g
If the small amount of MnS is combined with the large amount of HCl, The mass of any excess reactants will also be included in this total is the mass of the beaker with the small amount of MnS(s) and HCl(aq) after reaction is 504.35g.
What is balance chemical equation ?A balanced chemical equation is one that has the same number of atoms of each type in the reaction on both the reactant and product sides. In a balanced chemical equation, both the mass and the change are equal.
The balance chemical equation is as follows:
MnS(s) + 2HCl(aq) ⟶ MnCl₂(aq) + H₂S(g)
Thus, The mass of any excess reactants will also be included in this total the mass of the beaker with the small amount of MnS(s) and HCl(aq) after reaction is 504.35g.
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Suppose a different fatty acid molecule were used, with a molecular volume of 4.48 x 10-22 mL/molecule, and a molar mass of 235 g/mol. Use these data and the expected value for Avogadro's number to calculate its density (g/mL) by dimensional analysis. Hint: try starting with 235 g over 1 mole.
A student finds that the mass of a flask is 95.451 g. Her lab partner places a 10.00 mL sample of an
unknown liquid into the flask, and re-weighs it. The mass of the flask plus the liquid is 102.551 g.
What is the mass of the liquid?
According to law of conservation of mass, the mass of the liquid is 7.10 grams.
What is law of conservation of mass?According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.
According to law, mass of liquid= mass of flask and liquid-mass of liquid= 102.551-95.451=7.1 00 g.
Thus, the mass of the liquid is 7.10 grams.
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A brewed black tea generally has 81.30 milligrams of TA per 100 mL of water (which is to say it is at equilibrium). If a tea bag is steeped in 150. mL of water, what is the concentration of TA at equilibrium?
A brewed black tea generally has 81.30 milligrams of TA per 100 mL of water (which is to say it is at equilibrium). If a tea bag is steeped in 150. mL of water, 54.2 is the concentration of TA at equilibrium.
What do you mean by the concentration ?A substance's concentration is the amount of solute present in a given amount of solution. Molarity is the number of moles of solute in one liter of solution and is used to express concentrations.
Given:
M₁ = 81.30 milligrams
M₂ = ?
V₁ = 100ml
V₂ = 150ml
M₁V₁ = M₂V₂
By substituting given values in this equation and we get,
81.30 × 100 = M₂ × 150
M₂ = 81.30 × 100 / 150
= 54.2
Thus, 54.2 is the concentration of TA at equilibrium.
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Insulators ? thermal energy transfer.
Insulation is the process of constructing a barrier between hot and cold objects that prevents heat from transferring between them by either reflecting thermal radiation or reducing conduction and convection.
What reduces thermal energy transfer?
What is an insulator?The prevention of heat transfer between surfaces that are in thermal contact or within a radiative influence zone is known as thermal insulation. In addition to using the right item forms and materials, specially engineered technologies or processes can also be used to provide thermal insulation.
Thermal insulation prevents heat from moving from one substance to another when they are in thermal contact.
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Upon decomposition, one sample of magnesium fluoride produced 1.66 kg
of magnesium and 2.56 kg
of fluorine. A second sample produced 1.34 kg
of magnesium. How much fluorine (in grams) did the second sample produce?
The mass of Fluorine in grams in the second sample is 2066 g. The concept law of definite proportions is used here to obtain the mass of Fluorine in the second sample.
What is law of definite proportions?This law was stated by a French chemist, Louis Proust. It states that 'a chemical compound always contains the same elements combined together in the same proportion by mass'.
The mass of Mg in sample 1 is 1.66 kg and that of F is 2.56 kg. The mass of Mg in sample 2 is 1.34 kg and we have to find out the mass of F in second sample.
The mass of Fluorine in sample 2 can be obtained by using the mass ratio of the elements in sample 1.
In sample 1:
Mass of magnesium ÷ Mass of Fluorine = 1.66 kg ÷ 2.56 kg
In sample 2:
By using dimensional analysis,
Mass of Fluorine = 2.56 kg Fluorine ÷ 1.66 kg Magnesium × 1.34 kg Magnesium
Therefore the mass of Fluorine = 2.066 kg
The mass in kilogram can be converted into grams as:
Mass of Fluorine = 2.066 kg × 1000 g ÷ 1 kg = 2066 g
Thus the mass of Fluorine in the second sample is 2066 g.
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In the formation of carbon dioxide from carbon monoxide and oxygen, how many grams of carbon dioxide are produced by the reaction of 8 grams of oxygen with an excess of carbon monoxide?
The amount of carbon dioxide produced by the reaction of 8 grams of oxygen with an excess of carbon monoxide is 16 grams.
How many grams of carbon dioxide are produced by the reaction of 8 grams of oxygen with an excess of carbon monoxide?In the reaction of 8 grams of oxygen with an excess of carbon monoxide, 16 grams of carbon dioxide are produced.This is an example of a combustion reaction, whereby oxygen and a fuel, in this case carbon monoxide, combine to produce energy in the form of heat and light, as well as the product carbon dioxide.The reaction can be represented by the equation: 2CO + O2 → 2CO2.This equation indicates that for every 2 moles of carbon monoxide and 1 mole of oxygen, 2 moles of carbon dioxide are produced.Since 8 grams of oxygen is equal to 1 mole, 16 grams of carbon dioxide are produced.The excess of carbon monoxide ensures that all of the oxygen is used up in the reaction, resulting in the maximum amount of carbon dioxide being produced.To learn more about combustion reaction refer to:
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Gold (atomic mass=197) is plated from a solution clauric acid H4UCl4, It deposits on the cathode. Calculate the time to deposit 0.50g of gold passing a current of 0.10 (F=96485C)
Gold (atomic mass=197) is plated from a solution clauric acid H4UCl4, It deposits on the cathode. The time to deposit 0.50g of gold passing a current of 0.10 is 2.4 hour.
What is current ?The movement of electrons through a wire is referred to as electric current. The number of charges that move through the wire per second is measured in amperes (amps).
One mole of gold require 3 mole electron
Mass of gold deposited = 0.50g
Molar mass of gold = 197g
No of mole of gold = 0.50g/197g
= 0.0025
No of electron required = 3 × 0.0025
= 0.0076
1mole of electron having the charge of 96485C
Therefore, Columns for 0.0076 mole of electron = 940.43C
0.1 A current means 0.1 Columbs per second
Therefore, time to deposit 0.50g of gold = 940.44/0.1
= 9404.4second
= 2.4 hour
Thus, the time to deposit 0.50g of gold passing a current of 0.10 is 2.4 hour.
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In a study to determine the rate of the following reaction:
2NO(g) + O₂(g) -> 2NO₂(g)
the concentration of NO was 0.0450 M at t= 5.0 s and 0.0225 M at t= 650.0 s. What is the average rate of the reaction during this time period?
3.68*10-5 m/s is the average reaction speed for this time frame. a single rate that is a weighted average of the different rates that are applicable to property in various locations.
How do you find the average rate of time?It is described as "the ratio of change in reactant or product concentration to change in time in a chemical process." The average rate of the reaction will be negative as the rate of reactant concentration declines. The average rate of reaction will be favorable as the rate of product concentration rises.
2NO(g)+O2(g) -> 2NO_2(g)
Rate = -1/2 d[No]/dt
Average Rate = -1/2[0.0225-0.0700/650-5]
= 3.68*10^-5 m/s
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H₂ (g) + CO₂ (g) = H₂O(g) + CO (g)
K = 0.106 at 700 K. If a mixture of
gases that initially contains 0.0150 M
H₂ and 0.0150 M CO2 is allowed to
equilibrate at 700 K, what are the final
concentrations of all substances
present?
CO2(g) + H2(g) CO(g) + H2O(g) Initial no. of moles: 0.45 0.45 0 0 No. of moles
What are the final concentrations of all substances present?A chemical reaction is said to be in a state of chemical equilibrium when both the reactants and the products have reached a concentration that does not change with time. The rate of forward reaction is the same as the rate of backward reaction in this state.
The ratio of the concentrations of the substances on the right to those on the left equals a constant appropriate for that specific reaction in any equilibrium reaction. It is worth noting that the ratio is always written with the products preceding the reactants.
In chemistry, however, solution concentration is often expressed as a "molarity" (a molar concentration), which is defined as the number of moles of solute divided by the number of litres.
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Express your answers as integers separated by commas.
Not enough information man
I need help answering these
How many significant figures are in each of the following numbers?
a. 225.0
c. 0.0003210
b. 1000.0
d. 0.0067
e. 1,000,000.
f. 2.00001
Round off each of the following numbers to three significant figures.
a. 15.9994
c. 0.6654
e. 87,550
b. 1.0080
d. 4885
f. 0.027225
3. Perform the indicated arithmetic operations, and round the results to the appropriate number of significant figures or decimal places.
a. 77.981 x 2.33
b. 4 x 0.0665 =
c. 17.344.900 + 23.1
d. 9.80 4.762 =
e. 3.9 X 6.05 X 420 =
f. 14.1/5
g. 1001 + 16.23 =
h. 424.5+ 2.8461 =
i. 9.9-9.54
j. 7.3778 0.000265 =
k. (24.358)(6.4)
1. (48.6)(0.6959)
Significant figures are the meaningful digits in a number that convey its precision. In scientific and technical calculations, the number of significant figures is used to express the level of accuracy of a measurement or calculation.
What is the Number of significant figures?a. 225.0 - 4 significant figures
c. 0.0003210 - 5 significant figures
b. 1000.0 - 4 significant figures
d. 0.0067 - 3 significant figures
e. 1,000,000. - 7 significant figures
f. 2.00001 - 5 significant figures
Rounding to three significant figures:
a. 15.9994 -> 16.0
c. 0.6654 -> 0.67
e. 87,550 -> 87,000
b. 1.0080 -> 1.01
d. 4885 -> 4,900
f. 0.027225 -> 0.0272
Arithmetic operations rounded to the appropriate number of significant figures or decimal places:
a. 77.981 x 2.33 = 182.0 (3 significant figures)
b. 4 x 0.0665 = 0.266 (3 significant figures)
c. 17.344.900 + 23.1 = 17.345 million (1 decimal place)
d. 9.80 - 4.762 = 5.038 (3 significant figures)
e. 3.9 x 6.05 x 420 = 9,658 (3 significant figures)
f. 14.1 / 5 = 2.82 (3 significant figures)
g. 1001 + 16.23 = 1017 (3 significant figures)
h. 424.5 + 2.8461 = 427.3 (3 significant figures)
i. 9.9 - 9.54 = 0.36 (2 significant figures)
j. 7.3778 - 0.000265 = 7.378 (4 significant figures)
k. (24.358)(6.4) = 155 (2 significant figures)
l. (48.6)(0.6959) = 33.7 (2 significant figures)
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who was the first human in america
Answer:
no one can really be sure who was the very first human in america, but the Clovis people were the 1st type of people to populate the US. If you meant the person who founded america then Christopher Columbus would be your answer.
Also, not part of the answer, but this is marked in chem? not sure its supposed to be.
Scientific notation 7.77 x 10^4 =
Answer:
7.77×10^4=77,700
Explanation:
10^4 is 10,000, since there are 4 zeros in 10,000, move the decimal in 7.77 4 spaces to the right.
1: 77.7
2: 777.
3: 7,770.
4 77,700.
Side note: This trick ONLY works with +/-10^x value. If the value is positive the decimal moves to the right, and if the value is negative the decimal moves to the left.
Example: 7.77×(-10)^3=.00777
(-10)×(-10)×(-10)=(-10)^3= -1000
1: .777
2: .0777
3: .00777
HELPPP PLSS ILL GIVE U BRAINLIEST
Mountains can evolve in a variety of ways over time. They are susceptible to erosion from rain and wind, as well as landslides caused by flooding. Volcanic activity causes some mountains to change. They may also change as a result of earthquakes and tectonic plate movement.
What is volcanic activity ?A volcanic eruption occurs when lava and gas are expelled from a volcano, sometimes violently. A 'glowing avalanche,' which occurs when freshly erupted magma flows down the sides of a volcano, is the most dangerous type of eruption.
The heat from the mantle plume melts and thins the crust, resulting in surface volcanic activity.
Thus, In figure 3 there are two images one is millions of years ago and another is present day image. In both the images mountains are different because of erosion from rain and wind, as well as landslides caused by flooding.
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How many milliliters of 18.2 MH2SO4 are needed to prepare 600.0 mL of 0.10 MH₂SO4?
3.26 mL of a solution of 18.4 M H2 SO4 would be required. Therefore, 3.26 ml of that concentrated stock solution is what we need, and it seems like that is the right answer.
What does "concentrated" in liquid terms mean?Water has been removed from a concentrated liquid to increase its strength. Use honey or concentrated apple or pears juice sparingly to sweeten food. Synonyms: rich, concentrated, undiluted, and reduced More definitions of concentrated.
What do concentration and an example mean?to guide or draw to a common core or goal: focus. one's attention, concentrate. The lenses concentrate light, which means to collect into one entity, mass, or force. Only a select few skilled hands had all the power.
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why is baffle used in a Sparger
When baffles are present, the liquid becomes more turbulent and power is used more effectively. A sparger is a tool used to introduce air into the fermentor vessel below the liquid level.
What is the purpose of a sparger?In order to ensure that bubbles are distributed equally throughout the flotation cell or leach tank, industry tools called spargers are used to inject gas into these tanks. Isostatic pressing is used to create sparger elements from sintered metal powder. The material is subsequently compressed in a vessel with a solid steel core that is under pressure and filled with 900°C liquid.
An essential component of the vessel's mixing mechanism, a baffle encourages greater fluid flow for maximum effectiveness. By transforming the swirling into the correct flow pattern.
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Which of the following is the equation for impulse?
impulse =p
impulse =mv
impulse =FΔt
impulse =ma
The correct equation for impulse is FΔt. The third option.
What is impulse?In mechanics, the impulse is the amount of force applied to an object for a certain amount of time leading to a change in the momentum of the object.
The impulse is mathematically expressed as:
Impulse = FΔt
Where F is the amount of force applied in Newton and Δt is the changes in the time spent applying the force. In other words, impulse is the product of force in Newtons and time in seconds.
Thus:
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How many O atoms are in 0.150 mol of aspirin, C9H8O4
Answer: 3.61 × 10²³
Explanation:
Total anions =
Total cations =
The total number of cation is 1 and the total number of anion is 1.
What is cation and anion ?The positively charged particles are called as cation and the negatively charged particles are called as anions.
The number of atoms present in unit cell at corner are 4 red ( B cation ) 4 Blue (A cations)
Total number of cations at the corner = 8
1 atom at corner have 1/8th of its portion
8 atom have 1/8th × 8 atom = 1 atom
Number of cation = 1
Atoms at the edge contributes ¼ th portion
There are 4 anions at edges
Contribution from 4 anions
= 1 / 4 × 4
= 1
Total anions = 1
Total cations = 1
Thus, the total number of cation is 1 and the total number of anion is 1.
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Answer the question OR ELSE... you will eat a French Fry with a beatle in it.
N2 + 3H2 --> 2NH3
What volume(L) of NH3 at STP is produced if 25.0g of N2 is reacted with an excess of H2 ?
Question 1 options:
40.0 L
25.0 L
45.0 L
0.89 L
Answer:
40.0L
Explanation:
All "terminally differentiated" organs are immune to cancer
True or False
Answer:
false
Explanation:
Consider the endothermic reaction N2(g) + 3H2(g) ⇌ 2NH3(g). How does the following action affect an equilibrium reaction by driving the reaction? Increasing the volume of the system, while decreasing pressure
is this a forward or reverse reaction
For the given reaction, increasing the volume of the reaction system will shift the equilibrium to forward reaction. Decreasing the pressure will shift the equilibrium to the reverse direction.
What is chemical equilibrium ?The state of a reaction at which, the back ward and forward reaction takes place in equal rates is called equilibrium state. According to Le -Chatlier's principal, if any disorder imbalance the system, the system will balance it and shift to a new equilibrium state.
When the volume of reactants is increased, the reaction changes to the forward direction in which the increased volume is decreased. Hence, as the volume increases, forward reaction takes place.
When the pressure is decreased, the reaction will shift to the direction in which the number of moles of gas is increasing to increase the pressure. Here, the reactant side haves the 4 moles of gases and product side have 2 moles of gas.
Hence, decrease in temperature make a shift to the reverse reaction.
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The dazzling colors produced by fireworks result from excited gaseous atoms or molecules emitting light. The normal electron configuration of an atom is known as the
"ground state." In ground state all electrons are in the lowest energy levels available. When atoms or ions are heated, some electrons may absorb enough energy to
allow them to "jump" to higher energy levels. The atom or ion is then said to be in the "excited state." The electrons cannot remain in this excited state for long and will
emit energy in the form of light when they return to ground state. It is this light we see when an atom is heated in a flame. The frequency or color of light emitted
depends on the energy difference between the excited state and the ground state.
Chose the correct ground state configuration for Sr
1s22s22p63s23p64s23d104p65s2
1s22s22p63s23p64s23d104p8
1s22s22p63s23p64s23d104p75s1
1s22s22p63s23p64s24p64d105s2
Answer:
The ground state electron configuration of Sr (Strontium) is 1s22s22p63s23p64s23d104p65s2. This means that the electrons in the Sr atom occupy the lowest possible energy levels available to them. The electron configuration is written as a series of numbers and letters that indicate the number of electrons in each orbital. In this case, the first electron goes in the 1s orbital, the next two electrons go in the 2s orbital, the next six electrons go in the 2p orbital, the next six electrons go in the 3s orbital, the next six electrons go in the 3p orbital, the next ten electrons go in the 4s orbital, and the final two electrons go in the 5s orbital. When Sr is heated and its electrons are excited, they absorb enough energy to jump to higher energy levels. When these electrons then return to the ground state, they emit light of a specific frequency or color.
The wavelength and speed of a wave can be influenced by many factors. Adjust the amplitude and frequency as described in the table below. Then complete the chart to report whenever this causes the wavelength or wave height to increase or decrease. Also tell what effect the change will have on how the wave sounds. Return each variable to its original value after each experiment
The speed of the sound would increase as the wave speed increase.
What is the effect of the wavelength on the speed of sound?
We have to know that the speed of the sound is dependent on the wavelength and the relationship is a direct relationship if the frequency of the sound has been kept as a constant.
We can now be able to write that;
v = λf
v = wave speed
f = frequency
λ = wavelength
Now we can see that is we increase the wavelength of the sound then the wave speed of the sound would also increase .
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1.25 moles of gas is held at a temperature of -4.5°C. What is the volume of the gas if the pressure is 1.20 atm?
30 points
How many faraday is needed for 127g of Cupper in Chlorine cuprous?
Answer:
One Faraday is the charge of one mole of electrons, which is approximately 96,500 coulombs. To calculate the number of Faradays needed to reduce 127 grams of copper to the cuprous form in chlorine, we need to know the balanced chemical equation for the reaction and the equivalent weight of copper.
Explanation: