How many molecules of HCl are required to react with 2.50 moles Zn? Zn + 2 HCI —— ZnCl2 + H, Use 6.022 x 1023 mol-' for Avogadro's number. Your answer should have three significant figures.
Answers
Zn + 2 HCI —— ZnCl2 + H; The balanced chemical equation shows that 3.01 × 10^24 moles of HCl react with 2.50 moles of Zn.
To determine the number of HCl molecules required to react with 2.50 moles of Zn, we can use the balanced chemical equation:
Zn + 2 HCl → ZnCl2 + H2
From the equation, we see that 1 mole of Zn reacts with 2 moles of HCl. To find the moles of HCl needed for 2.50 moles of Zn, we can use the stoichiometric ratio:
2.50 moles Zn × (2 moles HCl / 1 mole Zn) = 5.00 moles HCl
Now, we'll use Avogadro's number to convert moles of HCl to molecules:
5.00 moles HCl × (6.022 × 10^23 molecules/mol) = 3.01 × 10^24 molecules HCl
Therefore, 3.01 × 10^24 molecules of HCl are required to react with 2.50 moles of Zn.
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Related Questions
Write the scientific term.
The number of grams of solute dissolved in 100 g of the solvent to form a saturated solution at STP
Answers
Answer: Solubility.
Explanation:
Solubility is defined as the maximum amount of solute dissolved per 100 g of the solvent at a certain fixed temperature to form a saturated solution.
STP condition is Standard Temperature and Pressure condition which is temperature of 273 K and pressure of 1 atm.
Thus the scientific term for "the number of grams of solute dissolved in 100 g of the solvent to form a saturated solution at STP" is called as Solubility.
if a body does not have enough potassium, how might that affect neuronal firing?
Answers
Potassium is fundamental for neuron activity. If a body does not have enough potassium, then the neuron will struggle to fire because there will not be enough positively charged ions to trigger the firing of the neuron.
The potassium (K+) is maintained at a high level within the neuron at rest, whereas sodium (Na+) is maintained at a high level outside of the cell.
Neurons contain K+ and Na+ leakage channels that allow the two ions to diffuse in favor of a concentration gradient.
Depolarization opens both K+ and Na+ channels in the membrane, thereby these ions can flow out and into the axon, respectively.
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At 273°K and 1 atm (STP), the volume of a gas is 1000ml. If the temperature changes to
298° K and the pressure is doubled, what is the new volume of the gas?
Answers
Answer:
V₂ = 545.79 mL
Explanation:
Given data:
Initial volume = 1000 mL
Initial pressure = 1 atm
Initial temperature = 273 K
Final temperature = 298 K
Final volume = ?
Final pressure = 2 atm
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
Solution:
V₂ = P₁V₁ T₂/ T₁ P₂
V₂ = 1 atm × 1000 mL × 298 K / 273 K × 2 atm
V₂ = 298000 atm .mL. K / 546 K.atm
V₂ = 545.79 mL
Ignoring the possibility of stereoisomers what is the iupac name of the following substance ch3ch2ch2ch
Answers
The IUPAC name of the given substance CH₃CH₂CH₂CH₃ is butane. Butane is a hydrocarbon with four carbon atoms, so it is named using the prefix "but-" in its IUPAC name. The suffix "-ane" indicates that it is an alkane, which means it consists only of single bonds between carbon atoms.
The IUPAC nomenclature is a systematic way to name organic compounds. In this case, the compound has four carbon atoms, so the prefix "but-" is used. The suffix "-ane" indicates that it is an alkane, which means it consists only of single bonds between carbon atoms.
The molecule has no functional groups or substituents, so there are no further modifiers needed in the name. Therefore, the IUPAC name of the compound CH₃CH₂CH₂CH₃ is butane.
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Complete question is:
Ignoring the possibility of stereoisomers what is the IUPAC name of the following substance CH₃CH₂CH₂CH₃?
Show your work with good use of units, rounding, and significant figures. [Hint: it is good practice to show the value of your answer before you round off to the final answer with the correct significant figures!]
(8 points) How much heat is required to convert 10.00 g of ice at –20.00°C to water at 25°C. The specific heat of ice is 2.09J/g°C; the specific heat of water is 4.182 J/g°C; the heat of fusion is 333.0 J/g.
Group of answer choices
Answers
Heat required : 4.8 kJ
Further explanationThe heat to change the phase can be formulated :
Q = mLf (melting/freezing)
Q = mLv (vaporization/condensation)
Lf=latent heat of fusion
Lv=latent heat of vaporization
The heat needed to raise the temperature
Q = m . c . Δt
1. heat to raise temperature from -20 °C to 0 °C
\(\tt Q=10\times 2.09\times (0-(-20)=418~J\)
2. phase change(ice to water)
\(\tt Q=10\times 333=3330~J\)
3. heat to raise temperature from 0 °C to 25 °C
\(\tt Q=10\times 4.18\times (25-0)=1045~J\)
\(\tt Q~tot=418+3330+1045=4793~J\rightarrow rounding~and~2~sig~figs=4.8~kJ\)
1400 J of heat energy is added to a sample of iron. The temperature of the sample
rose from 16 C to 20 C. How many moles of iron were used?
Answers
Answer: 14.24
Explanation:
Bronsted Lowry reactions can use hydroxide ions.
True
False
Answers
Answer:
f
Explanation:
What are 3 characteristics of a scientific theory?
Answers
The three characteristics of a scientific theory are : testable, the falsifiable predictions, theories are supported by the observation.
The scientific Theory is the model that can explains the facts about the nature on the basis of the observations, the experimentation and reasoning. The scientific theories have the characteristics as follows :
1) It is testable
2) The falsifiable predictions,
3) The theories are based on facts
4) The theories are based on observation.
5) The theories are modify according to the new observation.
The scientific theory is the theory based on the evolution that holds all the present life descended.
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in of the electron cloud in each element's atoms.
One way in which elements differ from each other is the structure of tl
In
has
n electron cloud, an electron that is farther away from the nucleus to
Answers
Answer:
Out of the answer choices, rubidium has the highest energy valence shell. With a single electron in the fifth energy level, krypton will have the highest number of energy levels of the group I elements listed.
Explanation:
kasama na jan ang explanation sana tama ang sagut thank you
select all the strong bases from the following list. multiple select question. ca(oh)2 h2so4 nh3 naoh koh
Answers
Strong bases are Ca(OH)₂, KOH, NaOH
A strong base is a substances that behave like a base and dissociates completely to give a solution that is composed of its ion and conjugate acid and hydroxyl ion bases are substances that accept hydrogen ion H⁺ from other atom and a strong base is a base that is completely dissociated in an aqueous solution and these compound ionize in water to yield one or more hydroxide ion per molecule of base
So in that given data Ca(OH)₂, KOH, NaOH this is the strong bases because in the OH⁻ hydroxide ion yield one or more hydroxide ion per molecule of base
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Given: S03(g) H20(1) -> H2SO4(1); AH° = -130. KJ
determine AH° for the following thermochemical equation. 5H2S04(1) -> 5$03(8) 5H20(1)
Answers
enthalpy of reaction AH° = +650 kJ for the following thermochemical equation. 5H2S04(1) -> 5S03(8) 5H20(1)
Given ,503(g) + 420/1) + H2S04(0); . Reverse the reaction is also change the sign of OH. H₂ So3 (1) 503(g) + H2O(1), DH" = +130kJ.Multiplying this equation by s. 512 804 11) 550₂ (g) + SH₂0 (1), DH" = 5X (+130kJ)= +650kJ. AH° = +650 kJ.This quantity, H, is referred to as the enthalpy of reaction or the reaction's heat. The quantification of heat published or soaked up by a chemical reaction is known as calorimetry. The quantity of heat transferred by the reaction causes the the solution's temperature to change. A scientist can use Delta H to ascertain whether a reaction emits heat (or is exothermic) or absorbs heat (or is endothermic) (or is endothermic). Delta H = m x s x Delta T, at which m represents the mass of a reagents, s is the heat capacity of the product, as well as Delta T is the temperature change caused by the reaction.
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describe something with numbers in science
Answers
Please help I'm struggling
What type of attractive force exists when two atoms form a temporary dipole or charge because of the movement of electrons?
Answers
Answer:
The correct option is A
Explanation:
The forces of attraction among the molecules or atoms of a substance are called inter molecular forces.
When two atoms gain temporary dipole and become polar for an instant the inter molecular forces of attraction between then are known as London dispersion forces.
London Dispersion Forces:
It is a type of inter molecular force that occurs when the electrons in two adjacent atoms are displaced in such a way that the atoms get some temporary dipoles, they attract each other through London dispersion forces. These inter molecular forces usually occur between non polar substances.
Answer: B intramolecular force
Explanation:
I’m making an invisible ink experiment. I’m using baking soda, water and a heat source. How do I explain the chemical/physical reaction?
Answers
Answer:
The physical reaction is...
Applying the baking soda/ water to the provided surface is a physical change, once a heat element is brought in, the releasing of heat is a chemical change; the baking soda changing color is in fact a chemical change because you are scorching it, it cant be undone.
Explanation:
Which statements explain the relationship between mass, velocity and kinetic energy? Select the TWO (2) that apply.
Consider the equation to calculate kinetic energy: KE = ½mv2
Kinetic energy decreases if either the mass or the velocity of the object decreases or if both decrease.
Kinetic energy decreases if either the mass or the velocity of the object increases or if both increase.
Kinetic energy increases if either the mass or the velocity of the object decreases or if both decrease.
Kinetic energy increases if either the mass or the velocity of the object increases or if both increase.
Answers
Answer:
I think D
Explanation:
Kinetic energy has a direct relationship with mass, meaning as mass increases so does the kinetic Energy of an object.
The _____ must be collected in order to determine the caloric content of food using a bomb calorimeter.
Answers
In order to determine the caloric content of food using a bomb calorimeter,
the following steps need to be taken:
Sample Preparation:
Obtain a representative sample of the food item that you want to analyze. The sample should be finely ground or homogenized to ensure uniformity.
Weighing the Sample:
Accurately weigh the prepared sample using a balance. The weight of the sample will be used in the calculations to determine the caloric content.
Assembling the Bomb Calorimeter:
Set up the bomb calorimeter according to the manufacturer's instructions. The bomb calorimeter consists of a bomb vessel, which is a strong sealed container, along with a stirrer, a thermometer, and an ignition system.
Filling the Bomb:
Place the weighed sample into the bomb vessel. It is important to ensure that the sample completely fills the bomb without any air gaps.
Oxygen Filling:
Flush the bomb vessel with pure oxygen to create an oxygen-rich environment for combustion. This ensures that the sample burns completely.
Sealing the Bomb:
Once the bomb is filled with the sample and oxygen, carefully seal the bomb to prevent any gas from escaping during the combustion process.
Calorimeter Setup:
Place the bomb into the calorimeter, which is essentially a water bath. The calorimeter is insulated to minimize heat exchange with the surroundings.
Initial Temperature Measurement:
Record the initial temperature of the water in the calorimeter using the thermometer.
Combustion:
Ignite the sample inside the bomb using the ignition system. The sample will undergo combustion, releasing heat energy.
Heat Transfer:
As the sample burns, the heat energy is transferred to the water in the calorimeter, causing its temperature to rise.
Final Temperature Measurement:
Monitor the temperature of the water in the calorimeter until it reaches a stable final temperature. Record this final temperature.
Calculation:
The caloric content of the food sample can be determined by measuring the heat transferred to the water and using the heat capacity of the calorimeter. This calculation involves the use of equations specific to bomb calorimetry.
By following these steps and conducting the necessary calculations, it is possible to determine the caloric content of food using a bomb calorimeter.
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How do you calculate % transmission
Answers
Answer:
you will have to use T = 1/10
When calcium carbonate is heated ,two new substances, calcium oxide and carbon dioxide are formed a)write a word equation for the above chemical reaction b)is calcium carbonate an element or a compound ?Explain
Answers
Answer:
Explanation:
When calcium carbonate is heated the new substances formed will be Calcium oxide and carbon dioxide
(a)
\(CaCO3 + heat\)→\(CaO+ CO2\)
\(Calcium carbonate + heat\)→\(Calcium oxide +Carbon dioxide\)
(b)
Elements are pure substances made up of the same atoms such as Ca, C, etc.
Compound are formed when two or more different types of elements are bonded together. like Calcium carbonate in this case
hence, \(CaCO3\) is a compound
Which energy level has the most energy available to it?
4
3
2
1
Answers
Difference between atomic number and atomic weight any 2 points
Answers
Answer:
According to the definitions given, atomic mass which is also called atomic weight is the measured total mass of an element's atom. Whereas, atomic number is nothing but the total number of neutrons and protons in the nucleus of an atom....
can u talk to in comment section
30 points if you tell me your favorite food! ☺️
Answers
Answer:
Pizza, salad, tacos, burgers, etc.
Explanation:
:D
4. For a typical vertebrate cell with a membrane potential of 0.050 V (inside negative), what is the free-energy change for transporting 1 mol of Ca+2 from the cell into the blood at 37 °C? Assume the concentration of Ca+2 inside the cell is 145 mM and in blood plasma it is 25 mM. Does this transport take place spontaneously or not? (R= 8.315 J/mol.K)
Answers
Free energy change for transporting Ca2+ ions is calculated as follows:∆G = RT ln ([Ca2+]outside/[Ca2+]inside)∆G = 8.315 J/mol.K x 310 K x ln (25 mM/145 mM) = -15,400 J/mol.
Here, ∆G is negative, which implies that Ca2+ ions transport spontaneously from the cell to blood. This is because the free energy of the system decreases when Ca2+ ions move from high concentration to low concentration. Therefore, transporting Ca2+ ions is energetically favorable.
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62g 72cm what is the density
Answers
Answer:
0.861111... g/cm³
Explanation:
density= mass/volume
identify the conditions for a standard electrochemical cell. select one or more: pressure of 1 atm temperature of 298 k solution concentrations of 1 m pressure of 5 atm solute masses of 1 g temperature of 273 k
Answers
The conditions for a standard electrochemical cell. select one or more : pressure of 1 atm temperature of 298 k solution concentrations of 1 M.
The electrochemical cell is the cell that is capable of generating the electrical energy from the chemical reactions or by the use of the electrical energy to cause the chemical reaction. The conditions for a standard electrochemical cell. select one or more : pressure of 1 atm temperature of 298 k solution concentrations of 1 M.
There are the two types of the electrochemical cells is as follows : the galvanic called the electrolytic cells. the galvanic cell is also called as the voltaic cell.
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Explain on what Nasa means and why it exists and when was it invented!
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Describe how you could show that a compound is an acid
Answers
Urgent please please I really need help
I will give you 60 points just please help
Answers
Answer:
1 = -15. 2 = +5
Explanation:
i just did it good luck
WILL GIVE BRAINLIEST
Which model provides more information-a chemical formula or a sketch of the molecule
like in the structural formula? Explain your reasoning.
Answers
Answer:
Explanation
:Both b/c a chemical formula tells you how many and a sketch formula shows how they are bonded together.
Molecular formulas show how many atoms of each element one molecule of a compound contains. Note: Ionic compounds are generally crystalline solids with high melting points. Other compounds, however, have very different properties.
True or False. Orbitals are a delocalized cloud of electron density.
Answers
False. A delocalized cloud containing electron density makes up orbitals. An electron from the valence band or ion that would be delocalized is one that is not bound to another atom a covalent bond.
How do covalent bonds work?A covalent bond is formed when two atoms exchange one or more sets of electrons. The two protons and neutrons are concurrently drawing these electrons to them. When there is a difference in the ionization energy of two atoms, a covalent connection is created.
What three kinds of covalent bonding are there?Single hydrogen bonding, double hydrogen bonding, and triple side chains are the three varieties of covalent bonds. One sigma and one pi link make up a double covalent bond, while two pi but one sigma binding make up a triple covalent bond.
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Magnesium, calcium and strontium are Group II elements.
) Calcium reacts with cold water to form two products:
a colourless gas, P, which 'pops' with a lighted splint
a weakly alkaline solution, Q, which turns milky when carbon dioxide is bubbled through it.
(i) Name gas P.
(ii) Identify the ion responsible for making solution Q alkaline.
(iii) Suggest the pH of solution Q.
(iv) Write a chemical equation for the reaction of calcium with cold water.
Answers
1) Gas P is hydrogen as hydrogen burns with a pop sound
2) OH -ve is the ion responsible for making Q alkaline
3)Since OH (-ve ) ion is responsible so it must be basic means Ph is more than 7 or can say between 7 and 14
4)Reaction of calcium with cold water:
Ca (s) + 2H2O (l) --> Ca(OH)2(aq.) + H2 (g)
So basically it is an experiment you also can perform when you hold a lighter near the bubble that formed during the reaction it will burn out with a pop sound.
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