What colors make the color turquoise?
Answer:
Two of them Lol
Explanation:
A 14.01 g sample of N2 reacts with 3.02 g of H2 to form ammonia (NH3). If ammonia is the only product, what mass of ammonia is formed?
How many moles of oxygen atoms are contained in the following?
1.67 x 10-2mol CuSO4-5 H₂O
The moles of oxygen atoms in 1.67 x 10⁻² mol CuSO₄·5H₂O is found to be approximately 0.1503 moles.
First, we need to determine the total number of oxygen atoms in one formula unit of CuSO₄·5H₂O. The formula CuSO₄·5H₂O contains:
4 oxygen atoms from CuSO₄5 oxygen atoms from 5 molecules of H₂OTherefore, each formula unit of CuSO₄·5H₂O contains a total of 4 + 5 = 9 oxygen atoms.
Next, we calculate the number of moles of oxygen atoms in 1.67 x 10⁻² mol of CuSO₄·5H₂O:
Moles of CuSO₄·5H₂O = 1.67 x 10⁻² molTotal oxygen atoms per mol = 9Moles of oxygen atoms = (1.67 x 10⁻² mol) x 9 = 0.1503 molThus, the number of moles of oxygen atoms in 1.67 x 10⁻² mol CuSO₄·5H₂O is 0.1503 moles.
What is the definition of heat?
What do an electron and a neutron have in common?
The structure of a solid is due to its
Exactly one mole of an ideal gas is contained in a 2.00-liter container at 1,000 K. What is the pressure exerted by this gas?
Given: R = 0.08205 L · atm/K · mol
Answer : The pressure of the gas is, 41.025 atm
Solution :
Using ideal gas equation :
[tex]PV=nRT\\\\P=\frac{nRT}{V}[/tex]
where,
n = number of moles of gas = 1 mole
P = pressure of the gas = ?
T = temperature of the gas = 1000 K
R = gas constant = 0.08205 L.atm/mole.K
V = volume of gas = 2.00 L
Now put all the given values in the above equation, we get the pressure of the gas.
[tex]P=\frac{nRT}{V}[/tex]
[tex]P=\frac{1mole\times (0.08205L.atm/mole.K)\times 1000K}{2.00L}[/tex]
[tex]P=41.025atm[/tex]
Therefore, the pressure of the gas is, 41.025 atm
Which of the following elements is classified as a halogen?
a. b
b. ba
c. be
d. br
. which of these statements is about reaction rate is accurate
A. All chemical reactions occur at a fast rate.
B. All chemical reactions occur at a slow rate.
C. All chemical reactions occur at different rates.
D. All chemical reactions occur at the same rate.
Balance: (NH4)2CO3-->NH3+H2O+CO2 ...?
Which atomic property is different in each isotope of an element?
Humans exhale carbon dioxide when they breathe. if the concentration of carbon dioxide in the air that people breathe gets too high, it can be fatal. therefore, in space shuttles, submarines, and other sealed environments, it is common to use "air scrubbers" to remove carbon dioxide from the air. the air scrubbers on the space shuttle remove carbon dioxide by using lithium hydroxide (lioh). the reaction in the air scrubbers is shown below: co2 2lioh li2co3 h2o each astronaut produces 8.8 × 102 g co2 per day that must be removed from the air on the shuttle. if a typical shuttle mission is 9 days, and the shuttle can carry 3.50 × 104 g lioh, what is the maximum number of people the shuttle can safely carry for one mission?
Answer: 4 people can carry safely for one mission.
Explanation: To calculate the number of moles of [tex]CO_2[/tex] produces by 1 astronaut, we use the formula:
[tex]Moles=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ....(1)
Molar mass of carbon dioxide = 44 g/mol
Given mass of carbon dioxide = [tex]8.8\times 10^2g[/tex]
Putting values in equation 1, we get:
[tex]Moles=\frac{8.8\times 10^2g}{44g/mol}=200moles[/tex]
We are given a chemical equation:
[tex]CO_2+2LiOH\rightarrow Li_2CO_3+H_2O[/tex]
Moles of LiOH by using equation 1, we get:
Molar mass of LiOH = 24 g/mol
[tex]Moles=\frac{3.40\times 10^4g}{24g/mol}=1458.3moles[/tex]
By stoichiometry of the reaction,
2 moles of LiOH produces 1 mole of [tex]CO_2[/tex]
So. 1458.3 moles of LiOH will produce = [tex]\frac{1}{2}\times 1458.3=729.15moles[/tex] of [tex]CO_2[/tex]
Applying Unitary method:
As, 200 moles of [tex]CO_2[/tex] are produced by 1 astronaut
So, 729.15 moles of [tex]CO_2[/tex] will be produced by = [tex]\frac{1}{200}\times 729.15=3.64\approx 4[/tex] astronauts.
Which of the following are most likely to form a metallic bond?
several gold atoms
copper and chlorine
magnesium and chlorine
several chlorine atoms
Final answer:
Several gold atoms are most likely to form a metallic bond since gold is a metal, capable of creating a lattice with a sea of delocalized electrons typical of metallic bonding.
Explanation:
The question revolves around identifying which scenario most likely forms a metallic bond. Metallic bonds are a type of chemical bond found in metal elements where the atoms contribute their valence electrons to form a 'sea of electrons' that are delocalized over all the atoms. This allows for a structure where positive metal ions are immersed in a sea of mobile electrons. Such bonds are typically found in elemental metals or alloys, not compounds with nonmetals like chlorine.
Among the given options, several gold atoms are most likely to form a metallic bond. This is because gold is a metal, and when multiple gold atoms come together, they form a metallic lattice with a sea of delocalized electrons, which is characteristic of metallic bonding. Copper and chlorine, as well as magnesium and chlorine, will more likely form ionic bonds due to the metal reacting with a nonmetal. Chlorine atoms alone form covalent bonds with each other, creating diatomic molecules, not metallic bonds.
IN A CHEMICAL CHANGE DOES THE ORIGINAL SUBSTANCE DISSAPPEAR ...?
Which statement best describes the effect of low ionization energies and low electronegativities on metallic bonding?
The valence electrons are easily delocalized.
The valence electrons stay in a single orbital.
The valence electrons break free of the crystals.
The valence electrons move closer to the nuclei.
Answer:
the valence electrons are easily delocalized.
Explanation:
Explain how conduction can increase the temperature of the air above Earth's surface. ...?
The temperature of the air above Earth's surface is mainly increased through convection, where warm air becomes less dense and rises, getting replaced by cooler air in a cycle. Conduction is inefficient over large distances, and radiation also contributes to heat transfer in the environment.
Explanation:Conduction is the process where heat is transferred through direct contact between materials, but conduction alone is not very efficient for warming the air above Earth's surface over large distances or in short times. Instead, the increase in air temperature is largely due to convection. This process involves the movement of warm air upward as it becomes less dense when heated, creating buoyant forces. As the warmer air rises, it is replaced by cooler air from surrounding areas, which then gets heated by the Earth's surface. In this way, convection creates a cycle that effectively distributes heat throughout the atmosphere.
Another form of heat transfer that plays a role in the earth's atmosphere and engine cooling is radiation. Radiation is the emission of energy as electromagnetic waves, which can transfer heat without the need for a medium. This is why we experience warmth from the sun even though there is a vacuum of space between the Earth and the sun.
\
Conduction is less efficient for warming the atmosphere and is surpassed by convection, where warm air rises due to decreased density as it heats, creating a cycle that distributes heat in the atmosphere.
Explanation:Conduction can increase the temperature of the air above Earth's surface through the process where heat is transferred through the direct contact of atoms and molecules. However, it is relatively inefficient for heating the atmosphere significantly because conduction is not effective over large distances and short time frames. Instead, the warming of the air is primarily the result of convection currents: warm air heated at the surface expands, becomes less dense, and rises, being replaced by cooler air that gets heated in turn. This creates a circulation pattern that helps distribute heat. It is due to the natural convection driven by buoyant forces that large-scale atmospheric circulation and ocean currents transfer heat around the globe, NOT primarily through conduction.
group 7a of the periodic table contains the most or least reactive elements
How many moles of each element 19.5g platinum
Is matter lost when a candle is burned
A teacher makes the following statement.
“Gasoline boils at a relatively low temperature (about 150°C). The kerosene is removed at around 200°C, followed by diesel oil at 300°C and fuel oil at around 370°C.”
What topic is the teacher most likely talking about?
a. distillation of a mixture
b. filtration of a pure substance
c.evaporation of a mixture
d. sorting of a pure substance
Answer:
The correct answer is option a.
Explanation:
According the question, boiling points of different liquids are discussed which means that if we take all these liquids in single mixture we can separate them from each other on the basis of their difference in boiling point. And the technique which employs this principle is distillation process.
Hence, we can say teacher is most likely talking about distillation of a mixture of oils.
Distillation is a process which is used to separate mixture of different liquids from each other. In this process, during the course of boiling of mixture liquid compound with lower boiling points vaporizes first leaving behind the liquid with higher boiling point behind.
And vapors of boiled liquid are condensed down in a separate container for the collection.
What was used in the first voltaic cell to allow for ion flow between the solutions of CuSO4 and ZnSO4?
A. a porous barrier
B. a non-porous barrier
C. a platinum bridge
D. a salt bridge
In the first voltaic cell, a salt bridge was used for ion flow between CuSO4 and ZnSO4 solutions. The salt bridge ensured electrical neutrality within the circuit and allowed for ion exchange to maintain cell function.
Explanation:In the first voltaic cell, a salt bridge was used to allow for ion flow between the solutions of CuSO4 and ZnSO4.
The purpose of the salt bridge is not only to maintain electrical neutrality within the internal circuit, but is also to permit the exchange of ions (transfer of charge). Without the salt bridge, the solution would rapidly reach the point where they could no longer release or accept ions, causing the voltaic cell to stop working.
The device, therefore, significantly enhanced the effectiveness and longevity of voltaic cells, playing an integral role in the advancement of electrochemistry.
Learn more about Voltaic Cell here:https://brainly.com/question/34404030
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Select the sentence that best describes why copper and some other metals are good conductors.
Answer
Copper atoms have loosely held electrons; this means they can freely move in and out of the nucleus of the atom.
Copper atoms have a loosely held free electron in their outer shell that is able to move freely to other atoms.
Copper and some other metals have highly active inner shells. This means that electrons can be freely exchanged between shells.
Copper has a small number of electrons; this means it can easily shed these electrons and take electrons from other atoms.
...?
Answer: Option (b) is the correct answer.
Explanation:
Electronic configuration of copper is [tex][Ar]4s1 3d^{10}[/tex] and copper is known as the best conductor of heat and electricity.
This is because in copper there is availability of free electrons in its valence shell (outermost shell).
And, as it is known that electricity is the flow of electrons. This means that since copper metal contains a number of free electrons. Hence, it can easily conduct electricity.
Thus, we can conclude that copper and some other metals are good conductors because copper atoms have a loosely held free electron in their outer shell that is able to move freely to other atoms.
A change in temperature causes a change in mass.
True
False
Answer:
false i hope this works
Explanation:
If Plank's constant is 6.6 x 10(-34) J/Hz, then what is the approximate frequency of a photon having an energy of 3 x 10(-19) Joules?
Final answer:
The approximate frequency of a photon with an energy of 3 x 10⁻¹⁹ Joules is 4.545 x 10¹⁴ Hz, calculated using Planck's equation E = hf.
Explanation:
To calculate the frequency of a photon with a given energy, we use the equation E = hf, where E denotes the energy of the photon, h is Planck's constant, and f is the frequency of the photon. In this question, the energy (E) is given as 3 x 10⁻¹⁹ Joules, and Planck's constant (h) is given as 6.6 x 10⁻³⁴ J/Hz. By rearranging the equation to solve for the frequency, we get f = E/h.
With the supplied values substituted, the computation is as follows:
f = (3 x 10⁻¹⁹ J) / (6.6 x 10⁻³⁴ J/Hz) = 4.545 x 10¹⁴ Hz.
Therefore, the approximate frequency of the photon is 4.545 x 10¹⁴ Hz.
If the net force on a 75-N object is 375 N from the left, in what direction will the object move?
Question 2 options:
toward the right
toward the left
in a straight line
to the side
Answer:
It will move to the right.
Explanation:
I took the test and wasn't very sure about this answer but I got it right. I also attached a photo down below for proof.
Good luck on your quiz! Have a great day. :)
Final answer:
With a net force of 375 N to the left, the 75-N object will move toward the left, in a straight line, according to Newton's second law of motion.
Explanation:
If the net force on a 75-N object is 375 N from the left, the object will move in the direction of the net force, which is to the left. This is in accordance with Newton's second law of motion, which states that an object will accelerate in the direction of the net external force.
The net force is a vector quantity, meaning it has both a magnitude and a direction. In this case, a net force to the left means that the force vector is pointing to the left, and therefore, the object will move toward the left.
It's important to clarify that the object will move in a straight line towards the left unless acted upon by another force that could change its direction. However, based on the information given, we can conclude that the object will just move toward the left.
Use VSEPR theory to predict bond angles in the following covalently bonded molecules. Explain your predictions.
a. methane
b. ammonia
c. water
Answer: Bond angle for methane is 109.5°,Bond angle for ammonia is 107° and Bond angle for water is 104.5°
: [tex]Formula used :{\text{Number of electrons}} =\frac{1}{2}[V+N-C+A][/tex]
where, V = number of valence electrons present in central atom
N = number of monovalent atoms bonded to central atom
C = charge of cation
A = charge of anion
a. Methane:[tex]CH_4[/tex]
In the given molecule, carbon is the central atom and there are 4 Hydrogens as monovalent atoms.
[tex]Formula used :{\text{Number of electrons}} =\frac{1}{2}[4+4-0+0]=4[/tex]
The number of electrons is 4 that means the hybridization will be [tex]sp^3[/tex] and geometry of the molecule will be tetrahedral.The bond angle for terahedral geometry is 109.5°.
b. Ammonia:[tex]NH_3[/tex]
In the given molecule, nitrogen is the central atom and there are 3 Hydrogens as monovalent atoms.
[tex]Formula used :{\text{Number of electrons}} =\frac{1}{2}[5+3-0+0]=4[/tex]
The number of electrons is 4 that means the hybridization will be [tex]sp^3[/tex] and geometry of the molecule will be pyramidal as there are three bond pairs and one lone pair.The bond angle for pyramidal geometry is 107°.the bond angle reduces due to lone pair bond pair repulsions.
c. water :[tex]H_2O[/tex]
In the given molecule, oxygen is the central atom and there are 2 Hydrogens as monovalent atoms.
[tex]Formula used :{\text{Number of electrons}} =\frac{1}{2}[6+2-0+0]=4[/tex]
The number of electrons is 4 that means the hybridization will be [tex]sp^3[/tex] and geometry of the molecule will be bent as there are two bond pairs and two lone pairs.The bond angle for pyramidal geometry is 104.5°.The bond angle reduces further due to greater lone pair-lone pair repulsions.
Consider the equation CaF2 + H2SO4 → CaSO4 + 2 HF. What type of reaction is this?
A. synthesis
B. decomposition
C. single displacement
D. double displacement ...?
The reaction between CaF2 and H2SO4 to form CaSO4 and HF is a double displacement reaction, where two compounds exchange ions.
Explanation:The reaction CaF2 + H2SO4 → CaSO4 + 2 HF is an example of a double displacement reaction. In this type of reaction, two compounds exchange ions or other groups to form two new compounds. In this particular reaction, CaF2 and H2SO4 trade their anions, resulting in the formation of CaSO4 and HF. Another name for this type of reaction is a metathesis reaction. It is important to note that this reaction is different from a synthesis, decomposition, or single displacement reaction.
Students in Mr. Klein’s chemistry class are conducting an experiment to calculate the specific heat of a copper sample. Mr. Klein requires each lab team to repeat the experiment until their percent error is 2% or less. Percent error is calculated using observed values (those students calculate from their lab results) and the true value (the accepted value based on reference). The formula for percent error is: (observed – true) x 100 true If the accepted value for the specific heat of copper is 0.385 J/g°C, which of the following lab teams have an unresolved problem on their hands
a.
team 1: calculates 0.392 J/gºC
b.
team 2: calculates 0.395 J/gºC
c.
both teams
d.
neither team
Final answer:
Team 2 has a percent error greater than 2% with their specific heat calculation of copper, while Team 1's percent error is within the acceptable range. Thus, Team 2 has an unresolved problem regarding their experiment.
Explanation:
To determine which lab teams have an unresolved problem based on their calculation of the specific heat of copper, we first need to calculate the percent error using the given formula:
Percent error = ((observed - true) × 100) / true
Where 'observed' is the experimental value and 'true' is the accepted value.
The accepted value for the specific heat of copper is 0.385 J/g°C. We can now calculate the percent error for each team:
Team 1: ((0.392 - 0.385) × 100) / 0.385 = approximately 1.82%Team 2: ((0.395 - 0.385) × 100) / 0.385 = approximately 2.60%Team 1 has a percent error within the 2% limit set by Mr. Klein, while Team 2 has exceeded it. Therefore, the answer is:
b. team 2: calculates 0.395 J/gºC
Which change takes place in a nuclear fusion reaction?
A) Matter is converted to energy.
B) Energy is converted to matter.
C) Ionic bonds are converted to covalent bonds.
D) Covalent bonds are converted to ionic bonds.
Answer:
Matter is converted to energy.
Explanation:
In a chemical reaction we consider that matter is conserved.It means in a chemical reaction the amount of matter on the reactant side is equal to the amount of matter on the product side.
However in case of nuclear reaction the matter gets converted to energy and thus there is loss of matter. Due to this conversion of matter into energy high amount of energy is associated with the nuclear reactions.
There is no change of ionic bond to covalent or vice versa.
Which of the following two cycles are the most closely related in their role in sustaining life?
a. carbon and nitrogen
b. water and nitrogen
c. carbon and oxygen
d. nitrogen and phosphorus please select the best answer from the choices provided a b c d
Answer: d. nitrogen and phosphorus
Nitrogen and phosphorus are important component of the genetic material present in the living organism, required for the expression of genes to perform a desire function in the living organisms. Both nitrogen and phosphorus are chief ingredients of the fertilizers required for the plant growth. Hence, nitrogen and phosphorous are two cycles that are most closely related in their role in sustaining life.