According to the given statement Object B, by 1 gram per cubic centimeter object has a greater density.
What is density ?The measure of how densely a substance is pressed together is called density. As the weight per unit volume, it meets that definition. The formula for density, denoted by the symbol D, is given as follows: density = m/V, where m denotes the object's mass and V its volume.
Does mass affect density?Mass and volume are intimately linked with density. In reality, it explains the precise nature of the connection between the two. By dividing the mass of an object by its volume, we may get its densities. The mass is said to have a low population density if it has a high volume but a tiny mass.
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Which two elements will release the most energy when they combine to make a compound?
Answer:
The most vigorous reaction, between two elements for the formation of an ionic compound, in theory, would be between the most electronegative element and the least electronegative element, Fluorine and Francium respectively, according to the Pauling scale. So it would be 2Fr + F2 ->2FrF. But for a more practically reasonable choice, because Francium has a very short half-life, would be Caesium and Fluorine because Caesium is just right above Francium, being in the same group (Group 1 / IA). 2Cs + F2 -> 2CsF. In both cases, the outermost electron of the Caesium/Francium atom will be taken by the Fluorine atom, in the process, releasing a massive amount of energy.
Explanation:
Although chemical reactions can involve any of the other hundred-plus elements on the periodic table, it turns out that most of the familiar energy-releasing reactions involve only hydrogen, carbon, and oxygen. Consider again the reaction, which involves only hydrogen and oxygen atoms. Metals often react with nonmetals to form ionic compounds. These compounds are composed of positive and negative ions formed by adding or subtracting electrons from neutral atoms and molecules. Nonmetals combine with each other to form covalent compounds, which exist as neutral molecules.
The substance that speed up the digestion stop working when they have been boiled, what does asim need to put in a fourth test tube to test this in his experiment?
He needs to put some pancreatic blood in a test tube to test for the functioning of digestion enzymes produced by the pancreas.
The objective of this experiment is to identify the substrates and substances.
An enzyme is a substance that acts as a catalyst to speed up a biochemical process. They also help in to speed up the digestion process.
The main the purpose of this experiment is to check why these enzymes aren't working properly. A pancreatic blood test needs to be done in a test tube to find out the reasons.
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In Spain, the legal blood alcohol limit is 250 of alcohol per 1 L of breath. What is this alcohol concentration in parts per billion, ppb?
The alcohol concentration in parts per billion, ppb given that the alcohol limit is 250 of alcohol per 1 L of breath is 25×10¹⁰ ppb
How do I determin the concentration in ppb?The concentration of substance in parts per million, ppb can be obtained by using the filling formula:
Concentration (in ppb) = (amount of solute / volume) × 10⁹
With the above formula, we can obtain the alcohol concentration in parts per billion, ppb as shown below:
The concentration of the vitamin C in ppb can be obtained as follow:
Amount of alcohol = 250Volume = 1 LConcentration (in ppb) =?Concentration (in ppb) = (amount of solute / volume) × 10⁹
Concentration (in ppb) = (250 / 1) × 10⁹
Concentration (in ppb) = 25×10¹⁰ ppb
Thus, the concentration in ppm is 25×10¹⁰ ppb
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How many moles are equal to 4.0 x 1025 atoms of tungsten
The number of moles are equal to 4.0 × 10²⁵ atoms of tungsten is 0.6624 moles.
Mole is the amount of substance that contain the element chemical units present in 12 g of carbon - 12.
given that :
number of present in atoms of tungsten = 4.0 × 10²⁵
1 mole contains = 6.022 × 10²³ atoms
therefore, 4.0 × 10²⁵ atom will contains :
number of moles = 4.0 × 10²⁵ / 6.022 × 10²³
number of moles = 0.6642 moles.
Thus, The number of moles are equal to 4.0 × 10²⁵ atoms of tungsten is 0.6624 moles.
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Which best represents a balanced equation?
200 grams of carbon dioxide
A. 120 grams of carbon plus 20 grams of oxygen -
B. 120 grams of carbon plus 50 grams of oxygen 200 grams of carbon dioxide
C. 120 grams of carbon plus 80 grams of oxygen 200 grams of carbon dioxide
D. 120 grams and carbon plus 100 grams of oxygen - 200 grams of carbon dioxide
Answer:
i think its C i may be wrong...
Explanation:
Which statement below best describes why NASA crashed DART into an asteroid?
The statement that best describes why NASA crashed DART into an asteroid is option A; NASA wanted to know if crashing a satellite into an asteroid would be enough to change the course of the asteroid.
Why is NASA colliding a spaceship with an asteroid?Double Asteroid Redirection Test is the name of the first "planetary defense" test that the US space agency, in collaboration with researchers at Johns Hopkins University, carried out to determine whether it was possible to change the course of an asteroid in deep space if one ever got close enough to threaten Earth.
The 'planetary defense' experiment on the Dart mission seeks to determine whether Armageddon-style impacts can be avoided.
Therefore, The world's first planetary defense technology demonstration, NASA's Double Asteroid Redirection Test (DART), successfully impacted its asteroid target on Monday after spending 10 months in space. This was the agency's first attempt to move an asteroid in orbit.
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given the table below that shows student's examples of proposed models of the atom: which model correctly describes the locations of protons and electrons in the wave-mechanical model of the atom?
The model accurately depicts where protons and electrons are in the wave. The proton is in the nucleus and the electron is where it is most likely to be. This is the mechanical model of the atom.
The electron was expected to move in circular orbits according to the Bohr model. On the other hand, orbitals are used in the wave mechanical model to characterise the electron positions. The two are not the same. Protons are located inside the nucleus in the wave mechanical model of an atom, but electrons are present where they are most likely to be.
A subatomic particle with a negative charge is an electron. A subatomic particle having a positive charge is called a proton. The strong nuclear force holds protons together in the nucleus of an atom. A type of subatomic particle without charge is the neutron (they are neutral).
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Is a process that is internally reversible and adiabatic necessarily isentropic?.
No, a process that is internally reversible and adiabatic is not necessarily isentropic. A process is isentropic if there is no change in entropy during the process. However, a process can be internally reversible and adiabatic and still have a change in entropy.
Entropy is a measure of the disorder of a system, and a reversible process can still have a change in entropy if the system is not in equilibrium.A reversible process is one that can be reversed without any change in entropy. However, if the system is not in equilibrium, the process can still have a change in entropy. This is because the entropy of a system is a measure of the disorder of the system, and a system that is not in equilibrium is not in a state of maximum disorder.
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one calorie (cal) is the amount of heat needed to (fill in the blank) the temperature of one gram of water one degree celsius.
Answer:
Raise
Explanation:
One calorie (cal) is the amount of heat needed to raise the temperature of one gram of water one degree Celsius.
the ph of saliva is normally in the range of 6.4 to 7.0. however, when a person is ill, the person's saliva becomes more acidic. (a) when marco is sick, he tests the ph of his saliva and finds that it is 6.1. what is the hydrogen ion concentration of his saliva? (round your answer to seven decimal places.) m (b) will the hydrogen ion concentration in marco's saliva increase or decrease as he gets better? increase decrease (c) after marco recovers, he tests the ph of his saliva, and it is 6.5. was the saliva more acidic or less acidic when he was sick? more acidic less acidic
A quantity that can be determined by using logarithms is a substance's pH. The base-10 logarithm can be used to calculate this. We multiply the logarithm of the hydrogen ion concentration by a negative number.
The hydrogen ion concentration of his saliva is 0.0000013 gram moles per liter.
Marco's saliva is said to have a pH of 5.9. We can solve for this number since we have an equation that determines the pH from the hydrogen ion concentration.
We must use the inverse of this logarithm to obtain the value of this variable because the pH is calculated using the logarithm with a base of 10. To do this, raise both sides by a factor of 10.
What is Saliva and what is it's pH ?The pH of saliva typically ranges from 6.2 to 7.6, with 6.7 being the average. The mouth's pH is not below 6.3 while it is at rest. Saliva helps to keep the pH of the mouth cavity close to neutral (6.7–7.3). There are two ways that saliva helps to keep the pH balanced.
Potential Hydrogen, or pH, is an acronym that indicates how much hydrogen is present in liquids and how active the hydrogen ion is.
An acidic pH is A pH of less than 7 results in acidic saliva, which can seriously harm your smile. Your smile will likely experience acid erosion when you have acidic saliva, which can eventually cause enamel loss, tooth decay, and cavities.
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1 ) Is this system at equilibrium?
2) As the system moves towards equilibrium (from reactants to products), what happens to the concentration of B and the concentration of A?
1. The answer to the statement above" Is this system at equilibrium " is yes as the reaction rate for both forward and reverse reaction are all equal.
2. From the above given task, as the equilibrium system moves from the reactants to the products, the concentration of the reactants and products are absolutely constant at equilibrium.Why the reaction system above is at equilibrium?It follows that from the reactions above, the concentration of A above is 1.5M and that of B is also 1.5, the resultant concentration is still 1.5M. This implies that the concentration of the A and B are constant throughout in the equilibrium reaction.
The major reason why the concentrations of B and that of A are the same is simply because both the forward and backward reactions are the same in all areas.
The major significance of equilibrium reactions is that it helps us to understand the direction of chemical reaction
So therefore, we can now confirm from the explanation above that a system is said to be at equilibrium when there is no change in the amounts or concentration of the reactants and products.
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what volume in \pu{ml}ml of 6.00 \pu{m}m acetic acid is needed to make 200 \pu{ml}ml of 0.05 \pu{m}m acetic acid?
1.6 ml volume of 6.00 m acetic acid is needed to 200 ml of 0.05 m acetic acid
WE know that
V1 * M1 = V2 * M2
V2 = 200 ml = 0.2 l
M1 = 6.00 m
M2 = 0.05 m
V1 * 6m = 0.2 l * 0.05 m
V1 = (0.2 * 0.05) / 6
V1 = 0.0016 L
V1 = 1.6 ml
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You are making a glass of Kool-Aid. You put 2 tablespoons of sugar, stir it until all the sugar is dissolved and then taste it. You realize it is not sweet enough so you add 10 more tablespoons of sugar and stir it. You notice that there are still solids in the glass. Do these solids indicate that a chemical reaction occurred?
Yes because you saw solids form and the color change, which indicates a chemical reaction.
No because the solids are not a new substance.
Yes because the solids are a new substance that formed between the Kool-Aid and water.
No because a chemical reaction has to show a change in denisty.
The solids are a new substance which indicate that a new substance is formed between the Kool-Aid and water as the chemical reaction has occurred between these two substances.
What is a chemical reaction?Chemical reaction is defined as a reaction which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.
There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical reactions:
1) inorganic reactions
2)organic reactions
3) biochemical reactions
During chemical reactions atoms are rearranged and reactions are accompanied by an energy change as new substances are formed.
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Chemical bonds contain a form of energy called chemical energy. Forming and breaking chemical bonds during reactions involves changes in energy.
---------------------------------------------------------
Identify if energy is released or absorbed when a chemical bond is broken. Then identify if energy is released or absorbed when a chemical bond is formed.
Explanation:
when a chemical bond is broken, the excess energy that was stored in the bond will be released whereas, for a bond to be formed energy is absorbed.
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what type of evidence have scientists collected and studied from deep ice cores that shows a correlation between changes in global climate with methane and carbon dioxide levels?
A correlation between changes in global climate with methane and carbon dioxide levels is Variations in ice layer color and thickness.
Ice cores provide direct information about how greenhouse gas concentrations have changed in the past, and also provide direct evidence that climate can change rapidly. By examining the gas trapped in the ice core, scientists learned the amount of carbon dioxide for the first time.
Global temperature has been associated with at least the last million years of Earth's history. A particularly powerful correlation technique is to use the composition of atmospheric gases trapped in ice bubbles. Since most gases remain in the atmosphere long enough to be well mixed on a global scale, ice cores around the world simultaneously exhibit the same atmospheric composition with trapped gas bubbles.
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2. What is the frequency of an electromagnetic wave that has an energy of 9.89 x 10-18 J?
a. Known values:
b. Equation:
C. Work:
d. Answer:
The frequency of electromagnetic waves with an energy of 9.89×10-18 J is 1.492 ×10^16 Hz.
What are electromagnetic waves?
These are the waves created due to the vibration caused between two fields, i.e., electric field and magnetic field.
In simple words, it originates from the oscillating magnetic and electric field. The electromagnetic spectrum gives us a range of frequency, wavelength and Energies.
It is used to classify the electromagnetic waves and arrange them according to their order of frequencies and wavelength.
Frequency = Energy/ Planck's constant
f= E/h
h=6.626×10^-34 J s
⇒9.89×10^-18/6.626×10^-34
⇒1.492×10^16 Hz.
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explain why atoms only emit certain wavelengths of light when they are excited. check all that apply.
Answer:
Explanation:
Atoms emit light because excited electrons are returning to lower energy states, emitting the energy difference :- Bohr model. This energy always has a specific wavelength because the electrons can only exist in set orbits.
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#SPJ4what volume of a 0.158 m potassium hydroxide solution is required to neutralize 27.5 ml of a 0.361 m nitric acid solution?
Volume of a 0.158 m potassium hydroxide solution is required to neutralize 27.5 ml of a 0.361 m nitric acid solution is 0.0159 ml
Volume is the measure of the capacity that an object hold
Here given data is
0.158 m potassium hydroxide solution is required to neutralize 27.5 ml of a 0.361 m nitric acid solution
And the balanced equation is
HNO₃ + KOH → KNO₃ + H₂O
And from the given equation
Mole ratio of acid HNO₃ i.e (nA) = 1
Mole ratio of base KOH i.e (nB) =1
And the molarity of HNO₃ i.e (Ma) = 0.361 m
Volume of base of KOH i.e (Vb) = ?
Molarity of base KOH i.e (Mb) = 0.158 M
Volume of acid HNO₃ i.e (Va) = 27.5 ml
Then MaVa/MbVb
27.5 ml × 0.361 m /0.158 M × Vb = 1/1
9.9275 = 0.158 M × Vb
Vb = 0.158 M/9.9275
Vb = 0.0159 ml
Therefore,0.0159 ml of potassium hydroxide solution is required for the reaction
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copper(i) iodide (cui) is often added to table salt as a dietary source of iodine. how many moles of cui are contained in 1.00 lb (454 g) of table salt containing 0.0100% cui by mass?
Copper(i) iodide added to table salt as a dietary source of iodine. 0.238mm of CuI are contained in 1.00 lb (454 g) of table salt containing 0.0100% CuI.
What is molar mass?Mass per mole is a definition of molar mass. Molar mass is the total mass of all atoms in substance that makes up a mole. It is measured in gram-per-mole units.
In the case of single elements or individual atoms, the molar mass is just the element's mass given in atomic mass units. Atom's atomic mass and molar mass are exactly equal.
Given,
Mass of table salt is 1.00 lb = 454 g
Copper(I) Iodine (CuI) present in the table is 0.0100% by mass or
CuI present in the 1 pound of salt = 0.01% of 454 g = 0.0454 grams
Now,
Molar mass of CuI = 63.54 grams + 126.90 grams
Molar mass of CuI = 190.44 grams
∴ number of moles of CuI present in 1 pound salt = Mass / Molar mass
Moles of CuI= 0.0454 / 190.44
Moles of CuI = 2.38 × 10⁻⁴ moles
Moles of CuI = 0.238 millimoles
∴ Moles of CuI present is 0.238mm.
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2. Which type of intermolecular force accounts for each of
these differences?
a) CH3OH boils at 65°C whereas CH₂SH boils at 6°C.
b) Xe is a liquid at atmospheric pressure and 120 K whereas Ar is a gas under the same conditions.
c)Kr, atomic mass is about 84 amu, boils at 120.9 K, whereas Cl₂, molecular mass about 71 amu, boils at
238 K.
At atmospheric pressure and 120 K, Xe is a liquid, whereas Ar is a gas at the same circumstances.
The right response is B.
What distinct intermolecular forces are there between each other?Intermolecular forces can be divided into three categories: hydrogen bonds, dipole-dipole interactions, and London dispersion forces (LDF). Despite the fact that molecules can have any combination of these three types of intermolecular forces, all substances at least contain LDF.
What are the four distinct intermolecular force types?These are the four principal intermolecular forces: Van der Waals dipole-dipole interactions > Ionic bonds > Hydrogen bonds > forces of Van der Waals dispersion.
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Write the structural formula of compound formed by replacing one hydrogen with OH group from ethane.
The structural formula of the compound formed by replacing one hydrogen with the OH group from ethane is Ethanol.
The alkane are the compound in which carbon atoms connected with single bond and carbon and hydrogen single bond . alkanes are called as saturated hydrocarbon. we use prefix eth for the two carbon atom and suffix ane for alkane .the ethane is alkane. The OH group is functional group called as hydroxy group. The suffix use for hydroxy group is ol.
CH₃ - CH₃ + OH -----> CH₃ - CH₂OH
ethane ethanol
Thus, The structural formula of the compound formed by replacing one hydrogen with the OH group from ethane is Ethanol.
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which is the major product of the reaction of ethyl grignard and propiophenone (ethyl phenyl ketone)?
2-Methyl-butan-2-ol is the major product of the reaction of ethyl grignard and propiophenone (ethyl phenyl ketone).
What type of reaction is Grignard?The nucleophile in a keto or aldehyde is coupled to alkyl, ethyl ester, vinyl, or allylic halides in the Fermentation process, an organo combination of carbon monoxide. It takes place in this process for carbon-carbon bonds to form.
What purpose does Grignard reagent serve?It is possible to count the halogen atoms in a halide compound using Grignard reagents. For the chemical examination of several glycerides as well as numerous cross-coupling processes for the synthesis of various dioxide and carbon-heteroatom linkages, Grignard degradation is employed.
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a five part per million standard has a percent transmission on a spectrometer of 34.780. what is the absorbance?
The absorbance of the sample with 34.780 percent transmittance is 3.54
What is transmittance?
Transmittance is the fraction of the incident light which passes through the sample and comes out successfully. In spectrometer, the detector detects the amount of light coming out of the sample and converts the reading into digital display. Absorbance is the fraction of the light which is being absorbed by the given sample.
The absorbance of the sample is,
A = 2 - log (-% T)
where, A = absorbance, %T = transmittance
A = 2 - log (-34.780) = 2 - (-1.54) = 3.54
Therefore, the absorbance of the sample having 34.780 percentage transmittance is 3.54.
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a soluble iodide was dissolved in water. then an excess of silver nitrate, , was added to precipitate all of the iodide ion as silver iodide, . if g of the soluble iodide gave g of silver iodide, how many grams of iodine are in the sample of soluble iodide? what is the mass percentage of iodine, , in the compound?
Answer:
a: 1.181grams of iodine are present in the sample of soluble iodide.
b: 76.44 percent iodine is the mass percentage of iodine when excess silver nitrate was added to precipitate all of the iodide ions
Explanation:
We know that when silver reacts with halides it forms precipitate, silver when reacts with iodine it forms a yellow coloured precipitate of silver iodide which is an inorganic compound soluble in water. One odd characteristic of silver iodide is that it is photosensitive and may form metallic/dark silver if exposed to light. One of the most renowned albeit controversial use of silver iodide is that it is used to generate rain through clouds
Ag+ (aqueous)+ I−(aqueous) →AgI(s) yellow precipitate
2.185g x (1 mole of AgI / 234.77 AgI) x (1 mole Iodine/1 mole AgI) x (126g of Iodine/1 mole of I)
= 1.181g
b)Now, mass percentage can be obtained by using the following formula
mass percentage = mass of solute/mass of solution x 100
iodine mass percent = (mass of iodine/mass of soluble iodide) x 100
= (1.181/1.545) x 100 = 76.44 %
mass percentage is the mass of the element/solute divided by the mass of compound or solution ,then the result is multiplied to get the answer. It can be defined as the weight of solute in a particular weight of solution.
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The concentration of a solution of sodium hydroxide is 0.10 mol/dm3. What is the concentration of the solution in g/dm3?
The concentration of solution of sodium hydroxide is 4 g/dm³ as per the molar concentration concept, to convert mole/dm³ to g/dm³ multiply the concentration by molar mass, which is 40 g.
What is molar mass?Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.
The molecular mass and formula mass are used as synonym for the molar mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.
Molar masses of an element are given as relative atomic masses while that of compounds is the sum of relative atomic masses which are present in the compound.
The molar mass of sodium hydroxide is 40 g thus, concentration in mole/dm³×40, that is 0.10×40= 4 g/dm³.
Thus , the concentration in g/dm³ is 4 g/dm³.
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which statement best describes groups and periods of the periodic table? select one: a. groups are vertical columns, while periods are horizontal rows. b. groups are mostly nonmetals, while periods are mostly metals. c. groups are horizontal rows, while periods are vertical columns. d. periods have similar properties, while the properties of groups gradually change.
The correct statement is "groups are vertical columns, while periods are horizontal rows".
The chemical elements are shown in tabular form on the periodic table, sometimes referred to as the periodic table containing the elements. It is frequently used in physics, chemistry, and some other sciences, and thus is frequently regarded as a symbol of chemistry.
The Periods were the horizontal rows of the periodic table. The periodic table contains seven distinct periods in all. They have the same amount of electron shells and thus are symbolized by the exact overall number of valence electron.
In a periodic table, the horizontal rows were known as periods, while the vertical columns were known as groups.
Therefore, the correct answer will be option (a).
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Answer:
groups are vertical columns, while periods are horizontal rows
Explanation:
the future value of a single sum: increases as the compound rate increases. increases as the compound rate decreases. decreases as the compound rate increases. increases as the number of compound periods decreases. decreases as the number of compound periods increases.
The future value of a single sum increases as the compound rate decreases.
Future value is the total amount received at a particular point in time if the initial investment and the interest earned on the initial investment are included.
Future value calculations are used for various accounting functions. The most common use is to understand how much money is in investment at a given point in time due to interest income.
The formula for the final value of the single sum is
Future value = P ( 1 + i )n
where P is the principal amount
i is the interest rate
n is the number of years
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Identify the following as metals, nonmetals or metalloids using the periodic table.
a. Silicon
b. fluorine
c. uranium
d. mercury
e. arsenic
f. iridium
DART sent images from a camera to record its progress.
How were the collision and the results of the collision recorded?
DART sent images from a camera to record its progress. The collision and the results of the collision were recorded by the International Space Station.
What is DART?DART stands for Double Asteroid Redirection Test. The investigative team of the (DART) mission indicates that the spacecraft's kinetic contact with its target asteroid, Dimorphos, successfully changed the asteroid's orbit.
Asteroid is a small planet in our Solar System. Asteroids range in size and shape from 1-meter boulders to a dwarf planet almost 1000 kilometers in diameter; they are stony, metallic, or ice worlds with no atmosphere.
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acetylene () is used in welding torches, because it produces an extremely hot flame when it burns. how many grams of carbon dioxide are formed in the combustion of 6.50 g of acetylene?
Acetylene (C₂H₂) is used in welding torches, because it produces an extremely hot flame when it burns. grams of carbon dioxide are formed in the combustion of 6.50 g of acetylene is 22 g.
the balanced reaction is given as :
2C₂H₂ + 5O₂ -----> 4CO₂ + 2H₂O
mass of C₂H₂ = 6.50 g
molar mass of C₂H₂ = 26 g/mol
number of moles of C₂H₂ = mass / molar mass
= 6.50 / 26
= 0.25 mol
2 moles of C₂H₂ produced 4 moles of CO₂
0.25 mol of C₂H₂ produced = (4 / 2) × 0.25 = 0.5 mol of CO₂ .
mass of CO₂ = molar mass × moles
= 44 × 0.5
= 22 g
Thus, Acetylene (C₂H₂) is used in welding torches, because it produces an extremely hot flame when it burns. grams of carbon dioxide are formed in the combustion of 6.50 g of acetylene is 22 g.
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