In this question, we have a situation where an ice cube is placed in a glass of hot water, which means we have a situation of exothermic and endothermic reactions occurring.
The endothermic reaction will be related to the ice cube, since this cube will increase its temperature, and in order to do that, the cube needs to absorb energy, and this thermal energy will come from the hot water
The exothermic reaction is the hot water releasing this thermal energy to its surroundings, and then the temperature will decrease as well
The options that are the answers will be:
C
F
Letter B should be the opposite, -qwater = qice, and letter A doesn't show the positive or negative sign
I’m not a picky eater; plants or animals are just fine for me! What am I?
The answer that I need starts with an H? Im confused
The answer is Homo sapiens. Homo sapiens is a genus of animals that are omnivorous. To be omnivorous means to be able to eat a plant-based AND animal-based diet. Ther are other kinds of omnivores, however, since the key term must start with H, this makes the above the right answer.
What other kinds of animals are omnivorous?Bears, birds, dogs, raccoons, foxes, some insects, and even humans are examples of omnivores. Predators are creatures that hunt other animals, whereas prey are animals that are hunted.
As adults, frogs and toads are carnivores, devouring insects and occasionally small animals. They are herbivores as tadpoles, consuming algae and decomposing materials.
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Hey y’all I’m having trouble understanding this, I would appreciate it if someone helped
By allocating algebraic variables as stoichiometric coefficients to each species in the unbalanced chemical equation, this method balances chemical equations.
H₂ + O₂ → H₂OBalancing it we get,
2H₂ + O₂→ 2 H₂O
N₂ + H₂ → NH₃Balancing it we get,
N₂ + 3H₂ → 2NH₃
H₂ + O₂→ H₂OBalancing it we get,
2H₂ + O₂→ 2 H₂O
K + H₂O → KOH + H₂Balancing it we get,
2K + 2H₂O → 2KOH + H₂
CH₄ + O₂→ CO₂ + H₂OBalancing it we get,
CH₄ + 2O₂ →CO₂ + 2H₂O
Fe + HCl → H₂ + FeCl₃Balancing it we get,
2Fe +6 HCl →3 H₂ + 2FeCl₃In this way all the chemical equations get balanced by balancing their coefficients stepwise.
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One of the most important chemical reactions is the haber process, in which n2 and h2 are converted to ammonia which is used in the production of fertilizers. Consider that you have just produced 170 g of nh3 in a 50. 0 l tank at 400. 0 c. What was the total pressure of the gases that reacted to produce this ammonia?.
The total pressure of the gases that reacted to produce ammonia is 22 Pa.
Considering the following balanced equation of the Haber process;
N₂(g) + 3 H₂(g) ----> 2 NH₃(l)
According to the balanced equation, 34.0 g of NH₃ are produced by 1 mol of N₂ as the molar mass of NH₃ is 17g/mol
Now calculating for 170 g of NH₃ as follows;
170g NH₃ × ( 1 mol N₂ / 34 g of NH₃) = 5 mol N₂
Similarly; According to the balanced equation, 34.0 g of NH₃ are produced by 3 moles of H₂, therefore calculating for 170 g of NH₃ as follows;
170g NH₃ × ( 3 mol H₂ / 34 g of NH₃) = 15 mol H₂
The total gaseous moles before the reaction were;
5.00 mol + 15.0 mol = 20.0 mol.
Now we can determine the total pressure (P) by using the ideal gas equation.
P.V = n.R.T
where
V is the volume (50.0 L)
n is the number of moles (20.0 mol)
R is the ideal gas constant (0.08206atm.L/mol.K)
T is the absolute temperature (400.0 + 273.15 = 673.2K)
P = n.R.T / V
P = (20.0 mol × 0.08206atm.L/mol.K × 673.2K) / 50 L
P = 22 atm
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Which statement best describes a mole?
It is 12 units of a given substance.
It contains 6.02 Times. 1023 grams of sodium chloride.
It is the mass of 12 carbon atoms.
It contains 6.02 Times. 1023 particles of a given substance.
Best describes a mole is it contains 6.02×10²³ particles of a given substance
Mole is the amount of substance that contain the same number of elementary entities and according to the Avogadro's law number of elementary entities in the substance is 6.02×10²³ and these elementary entities could be atoms, ions, molecules etc and we use the mole to express the amount of substances and one mole of any substance is the equal to its atomic mass and molecular mass which is expressed in gram and the number of particles present in one mole of any substance is 6.02×10²³
Therefore the statement which is correct for mole is it contains 6.02×10²³ particles of a given substance
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what is the concentration of a naoh solution if 26.96 ml are needed to titrate 0.5930 g of khp? enter your answer with a unit of m.
0.000107 mol is the concentration of a NaOH solution if 26.96 ml are needed to titrate 0.5930 g of KHP.
What is KHP?KHP, also known as potassium hydrogen phthalate, is an acidic salt chemical. It produces a colorless solution, a white powder, colorless crystals, and an ionic solid that is the monopotassium salt of phthalic acid.
Moles of KHP= 0.5930/204.22g/mol
Moles of KHP=0.0029mol
now when26.96 ml are needed
concentration=0.0029/26.96
Concentration=0.000107 mol
Hence,0.000107 mol is the concentration of a NaOH solution if 26.96 ml are needed to titrate 0.5930 g of KHP.
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what is the number of sigma and pi bonds in C2H4O2??
There are 7 sigma bonds and 1 pi bond in C2H4O2.
What are sigma bonds?Sigma bonds are known as the strongest type of covalent chemical bond which are formed by head-on overlapping between atomic orbitals. Sigma bond is most simply defined for diatomic molecules using the language and tools of symmetry groups.
There are some parameters in determining sigma bonds and they include the following:
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A gas has a temperature of 34.9 degrees C and a volume of 70.0 L. If the temperature increases to 86.8 degreesC , what is its final volume ?
Answer
Its final volume is 81.8 L
Explanation
Given;
Initial temperature, T₁ = 34.9°C = (34.9 + 273.15 K) = 308.05 K
Initial volume, V₁ = 70.0 L
Final temperature, T₂ = 86.8°C = ( 86.8 + 273.15 K) = 359.95 K
What to find:
The final volume at 86.8°C.
Step-by-step solution:
The final volume, V₂ can be calculated using Charle's law formula below:
[tex]\begin{gathered} \frac{V_1}{T_1}=\frac{V_2}{T_2} \\ \\ \Rightarrow V_2=\frac{V_1T_2}{T_1} \end{gathered}[/tex]Putting the values of the given parameters into the formula, we have
[tex]V_2=\frac{70.0L\times359.95K}{308.05K}=81.8\text{ }L[/tex]Hence, if the temperature of the gas increases to 86.8 degrees C, its final volume is 81.8 L
Answer:
81.8 L
Explanation:
Ideal gas law:
PV = nR T
V = nR/P * T since nr and P are constant , this becomes
V = k T where k is a proportionality constant ====> then: V/T = k
so:
V1/T1 = V2/T2 ( NOTE : T must be in K)
V2 = T2 ( V1/T1) = ( 86.8 + 273.15) ( 70.0) /(34.9 + 273.15) = 81.8 L
Investigate the effect of the concentration of the disodium thiosulfate solution on the rate of the process
Na2S2O3 + H2SO4 = Na2SO4 + SO2 + H2O + S.
Prepare a control sample by adding 1 cm^3 of sulfuric acid solution to 3 cm^3 of Na2S2O3 solution. Pay attention to the upcoming changes.
Pour 1 cm^3, 2 cm^3 and 3 cm^3 of Na2S2O3 solution into three test tubes respectively. Using a pipette (or syringe), add 2 cm^3 of water to the first tube, and 1 cm^3 of water to the second. Thus you get three solutions of equal volume and different concentration.
To each of the tubes successively add 1 cm^3 of sulfuric acid solution and note the time for the solution to darken from the sulfur released during the reaction. Record the results of each experiment in the table.
Graphically represent the relationship between the reaction time and the concentration of Na2S2O3 (∆t = f1(c)).
Represent the graphical dependence 1/∆t = f2(c).
Based on the graphs, draw a conclusion about the effect of concentration on the rate of the reaction.
Answer: yes but im not 100 percent sure
Explanation:
Use the drop-down menus to identify the class of compounds to which each structure belongs. A skeletal chain goes up, down, up, down to C double bonded to O, up to O H. A skeletal chain goes up to O, down, up, down, up. A hexagonal ring is single bonded to C l on one corner. N has a pair of electron dots above, and is single bonded to R Superscript 1, wedge bonded to H, and wavy bonded to H.
Functional group can be interconverted into each ther by the means of suitable reagent. Functional group are responsible for the chemical and physical properties of a compound.
What is functional group?A group of atoms forming a component of a molecule that accounts for a particular function or chemical behavior is called a functional group. There are so many functional group in organic chemistry.
a. A skeletal chain goes up, down, up, down to C double bonded to O, up to O H is Carboxylic group COOH.
b. A skeletal chain goes up to O, down, up, down, up. A hexagonal ring is single bonded to C l on one corner. this belongs to cyclic substituted compound.
c. N has a pair of electron dots above, and is single bonded to R Superscript 1, wedge bonded to H, and wavy bonded to H. This belongs to primary amine compound.
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what happens when mix vinegar and baking soda???
is for science project
Answer:
The mixture quickly foams up with carbon dioxide gas.
Explanation:
Answer:
Explanation:
When you mix vinegar and baking soda, you will get an acid solution.
witch substance exhibits metallic bonding in the solid state
Answer:
Explanation:
When in a solid state, the substances that exhibit metallic bonding include metals, metal alloys, and some metalloid elements. Metals always form metallic bonds when bonding to other metal atoms.
The electron configuration of an element is 1s22s22p6. Will a bond form if an atom of this element moves towards an atom having seven valence electrons? Why or why not?
Answer:
No it mostly likely would not because the first element(Neon) is already stable as it's outermost shell is completely filled
Explanation:
I'm not 100% sure about this because I know that some weird bonds do form in real life especially with the dative covalent
What is the frequency of a red light with a wavelength of 650 nm?
Answer:
It would be approximately 4.61 x 10^14 Hz
Explanation:
Well if a narrow beam that is at a wavelength of approximately[tex]650 nm (650 x 10^{-9}m)[/tex] would correspond to a frequency of approximately[tex]6.61 x 10^14 Hz[/tex] which would make it be a few hundred terahertz.
Hope this helps :)
Answer:
approximately 4.61 x 10^14 Hz
why is the melting point for vanillyl alcohol so much higher than that of vanillin? use intermolecular forces to guide your answer.
Because vanillyn alcohol involves intermolecular hydrogen bonding interactions rather than vanillin's weak interactions that result in a stable compound, vanillyn alcohol has a much higher melting point than vanillin.
What is the intermolecular forces ?The attracting and repellent forces that develop between the molecules of a material are referred to as intermolecular forces (IMF), which is sometimes shortened. These forces operate as a mediator between a substance's individual molecules.The majority of matter's physical and chemical characteristics are caused by intermolecular forces.Intermolecular forces are the aggregate name for the forces that exist between the molecules themselves. The primary cause of the substance's physical properties is intermolecular forces. The condensed states of matter are caused by intermolecular forces. Intermolecular forces, which hold the particles that make up solids and liquids together, have an impact on a number of the physical characteristics of matter in these two states.Learn more about Intermolecular forces refer to :
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In a galvanic cell, _______________ occurs at the anode? (1 pt)
*
1 point
oxidation
reduction
In a galvanic cell, oxidation occurs at the anode?
The slogan "Red Cat An Ox" states that reduction happens at the cathode whereas oxidation happens at the anode. The anode would be the negative terminal for such galvanic cell because the anode's reaction serves as the origin of the electrons for such current.
No matter what kind of electrical cell is used, oxidation always occurs at the anode. Galvanic as well as electrolytic cells have reversible both cathode and anode charges.
Therefore, oxidation will happen at anode.
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THE RIGHT GETS 10 POINTS AND BRAINLIEST
Which layer is between the asthenosphere and the outer core? (7 points)
a
Crust
b
Inner core
c
Lithosphere
d
Mesosphere
The layer which is between the asthenosphere and the outer core is referred to as the Lithosphere and is denoted as option C.
What is Lithosphere?
This is referred to as the outermost rocky layer of the earth and has a rigid structure. It is made up of the crust and the solid outermost layer of the upper mantle which is the reason why it has a rigid structure.
It can also be described as the region or layer which is between the asthenosphere and the outer core which is therefore the reason why it was chosen as the correct choice.
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calculate the energy in joules released by the fusion of a 1.25 -kg mixture of deuterium and tritium, which produces helium. there are equal numbers of deuterium and tritium nuclei in the mixture.
4.2 × 10^14 J will be the energy released by the fusion of a 1.25 -kg mixture of deuterium and tritium, which produces helium.
Emitted energy in the reaction will be
E = (1876.136 + 2809.45) (3728.42 +939.565)
E =017.6 Mev
Now total atomic bar weight A = (2+3) = 5 grams
total no of atoms = 2Na
for 1-25 kg
= (2Na/5)X1250
= (2x6.023×10^23/5)*1250
= 3.0115×10^26
In Joules released energy in fusion a 1.25kg mixture of denterium and trilium will be
Q = 2.65 × 10^33 × 1-6 × 10^-19 J
= 4.2 × 10^14 J
the energy released by the fusion deuterium and tritium is 4.2 × 10^14 J.
the complete question is:
The atomic masses of deuterium and tritium are 2.014102 u and 3.016049 u respectively. Calculate the energy in joules released by the fusion of a 1.25 -kg mixture of deuterium and tritium, which produces helium. There are equal numbers of deuterium and tritium nuclei in the mixture
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Give the name for the formula PbO
Chlorine can bond with fluorine to form ClF. Chlorine can also bond with lithium to form LiCl. Which compound will have a greater partial charge?Question 2 options:A) Both compounds will have the same partial charge.B) ClFC) LiClD) Neither compound will have partial charge.
In this question, we have two compounds, ClF and LiCl. The first molecule is a covalent compound, since we will not have donation of electrons but instead the sharing of electrons, but in this case, the difference of the electronegativity will cause this molecule to have Polar covalent bond, which will cause partial charges to occur. LiCl is a molecule in which we have a greater difference in electronegativity, which makes this molecule be an ionic molecule, and not covalent. Since ionic compounds have real charges, the only possible answer will be ClF, since they have partial charges. Letter B
If the contact area between two objects is
getting warm, what might you conclude?
Answer: The end result is thermal equilibrium.
Explanation: When two objects are touching for a specific period of time heat [thermal energy] always moves from a warmer substance to a cooler substance. In your case we have two objects of unknown temperature. The temperature between those objects is transferred/ conducted. Eventually, the heat conduction between two objects of unknown temperature results in the achievement of thermal equilibrium.
Answer: Thermal equilibrium
Explanation :Heat will transfer thermal energy from the object at higher temperature to the one at lower temperature until they both reach the same temperature. The objects are then in thermal equilibrium, and no further temperature changes will occur if they are isolated from other systems. The systems interact and change because their temperatures are different, and the changes stop once their temperatures are the same. Thermal equilibrium is established when two bodies are in thermal contact with each other—meaning heat transfer (i.e., the transfer of energy by heat) can occur between them. If two systems cannot freely exchange energy, they will not reach thermal equilibrium. (It is fortunate that empty space stands between Earth and the sun, because a state of thermal equilibrium with the sun would be too toasty for life on this planet!)
1. You have 4 moles of NaCl. How many particles are present?
To calculate the molecules present in the given moles we will apply for Avogadro's number. Avogadro's number tells us that in one mole of any substance there are 6.022x10^23 molecules.
Therefore if we have 4 moles of NaCl we will have:
[tex]\begin{gathered} moleculesNaCl=GivenmolNaCl\times\frac{6.022\cdot10^{23}moleculesNaCl}{1molNaCl} \\ moleculesNaCl=4molNaCl\times\frac{6.022\cdot10^{23}moleculesNaCl}{1molNaCl} \\ moleculesNaCl=2\times10^{24}moleculesNaCl \end{gathered}[/tex]In 4 moles of NaCl there are 2 x10^24 molecules
question content area use the references to access important values if needed for this question. what atomic or hybrid orbitals make up the sigma bond between si and h in silane, sih4? orbital on si orbital on h what is the approximate h-si-h bond angle?
sp^3 is the hybrid orbitals make up the sigma bond and 1s is the orbital on si orbital on h and bond angle is 120.
In a complex molecule or ion, the angle between two orbitals that contain bonding electron pairs, or bonds, that are arranged around the centre atom is referred to as the bond angle. Using a spectroscopic approach, it is estimated and measured in degrees. How many lone electron pairs are present affects the bond angles. For instance, boron trichloride has a trigonal planar structure, no lone pairs, a bond angle of 120 degrees, and none of these characteristics.
Hybrid orbitals are created by combining the atomic orbitals of a single atom in a model in a way that creates a fresh set of orbitals with geometries suitable for forming bonds in the directions suggested by the VSEPR model. In order to create new hybrid orbitals, atomic orbitals are mixed.
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A student bends a paperclip rapidly back and forth. When he touches the point where he was bending the paperclip, he finds that its temperature has increased. why did it increase?
A student bends a paperclip rapidly back and forth when he touches the point where he was bending the paperclip, he finds that its temperature has increased because temprature goes up at the point of the bending
Temprature is the degree of hotness and coldness and here when student bends a paperclip rapidly back and forth he touches the point where he was bending the paperclip then the temprature is increases because of temprature goes up at the point of the bending and molecule of clip start moving slower
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a student performs an experiment where gas is collected over water in an upside down graduated cylinder. if the atmospheric pressure is 733 mmhg and the level of water in the graduated cylinder is 14.4 cm higher than the level of the water exposed to the atmosphere, what is the total pressure of gases inside the graduated cylinder?
total pressure of gases inside the graduated cylinder will be equals to the sum of atmospheric pressure and Pressure change inside the glass.
Atmospheric pressure = 733 mm of Hg
Pressure change inside the glass = dgh
where d is the density of gas i.e. 1000 kg per meter cube
g is acceleration due to gravity i.e. 9.8 meter per second square
h is the level of water in the graduated cylinder i.e. 14.4 cm = 0.144m
Pressure change inside the glass = dgh
Pressure change inside the glass = (1000)(9.8)(0.144)
Pressure change inside the glass = 1411.2 Pa
Pressure change inside the glass = 10.584 mm of Hg
Total pressure = 733 + 10.584 = 743.584 mm of Hg
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Which map would you bring with you as you navigate the wilderness?
The map that would I bring with me as I navigate the wilderness is Topographic maps.
Why carry Topographic maps?Because topographic maps use contour lines to indicate the geometry of landforms, they are excellent for wilderness navigation (mountains, valleys, ridges, saddles).
Reading topographic maps has somewhat lost some of its appeal with the development of reliable, accurate GPS devices and phone navigation apps.
However, no matter how sophisticated and costly your equipment is, it could still run out of batteries, malfunction due to excessive dampness, cease functioning in the cold (cough, iPhones), or fall off a cliff and smash.
Additionally, the satellite signal that your device requires to locate you will always decide to go out at the worst possible time.
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Pls help nowwww I’m begging
a rocket fuel, hydrazine, is produced by a reaction of cl2 with excess naoh and nh3. a.) how many grams of hydrazine can be produced from 1.00 kg of cl2?
A rocket fuel, hydrazine, is produced by a reaction of cl2 with excess naoh and nh3. a.) 473 g of hydrazine can be produced from 1.00 kg of cl2
N2H 4 is created when 1 mole of ClNH 2 reacts.
ClNH 2 has a molar mass of 35.5+14+2=51.5 g/mol.
N2H 4 has a molar mass of 2(14)+4=32 g/mol.
As a result, 32 g of N2H 4 is created from 51.5 g of ClNH 2.
As a result, when 1000 g of ClNH2 reacts, 321000/51.5 = 621.36 g of N2H 4 is produced.
Only 473 g of N2H4 are produced, though.
As a result, the reaction's percentage yield is 473 100/ 621.36=76.12%.
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Objective: Apply the concepts of mole and stoichiometry.
Question: If 50.0 g of O₂ are mixed with 4.5 g of H₂ and the mixture is ignited, what mass of water is
produced?
Include a balanced reaction equation, definitions, explanations, and discussion of your problem-solving
process.
The mass of water when 50.0 g of O₂ are mixed with 4.5 g of H₂ and the mixture is ignited is 56.25g. Here the concept of mole can be applied.
What is mole?
A mole can be explained as the substance containing an Avogadro number of particles that is 6.022 x 10^23 particles in it. It can be calculated by dividing the mass of the substance by molecular mass of the substance.
The reaction can be written as,
2H2 + O2 --------> 2H2O
4g 32g 36g
Here, 2 moles of H2 is reacting with 1 mole of O2 to give 2 moles of water. 50.0 g of O₂ are mixed with 4.5 g of H₂ and the amount of oxygen reacting is less so it can be considered as the limiting reagent.
The mass of water = 36g x 50g / 32g = 56.25g
Therefore, 56.25g of water can be formed when 4.5 g of H2 and 50g of O2 is reacting. This can be seen in mole concept of balanced chemical reaction.
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PLEASE ANSWER SCIENCE
The great Rift valley is a large land fracture that extends 3000 kilometers across the African continent. the process form the great rift valley is The widening of the crust along a divergent boundary as two plates carrying continental crust pull apart.
Rift valley is long narrow valley formed in the dispersion of block of earth crust. Rift valley is found in land as well as in bottom of ocean due to seafloor spreading. rift valley formed by the tectonic action. one of the example of divergent boundary is the great rift valley.
Thus, The great Rift valley is a large land fracture that extends 3000 kilometers across the African continent. the process form the great rift valley is The widening of the crust along a divergent boundary as two plates carrying continental crust pull apart.
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Ozone in the upper atmosphere (the ozone layer) absorbs light at around 220 nm. what is the frequency???
Answer:
1.36x10^15 Hertz
Explanation:
The wavelength, λ, and frequency, ν, of light are described by the equation:
c = λν
where c is the speed of light (c = 3.0x10^8 m/s)
We are given the wavelength, λ, as 220nm
We'll need this in meters, not nanometers, nm.
1nm = 10^-9m
(220nm)*(10^-9m/nm) = 2.20x10^-7m
v = c/λ
v = (3.0x10^8 m/s)/(2.20x10^-7m) = 1.36x10^15/s or Hertz (1360 terahertz)