for what maximum kinetic energy is a collision between an electron and a hydrogen atom in its ground state definitely elastic?

The concentration of chloride ions in the solution is 0.012 mM.

To determine the concentration of chloride ions (Cl-) in the solution, we need to first calculate the number of moles of calcium chloride (CaCl2) that were dissolved in the solution. We can use the formula weight of calcium chloride, which is 110.98 g/mol:

=> 23.7 g CaCl2 / 110.98 g/mol

=> 0.214 moles CaCl2

Next, we need to determine the number of moles of chloride ions produced when the calcium chloride dissolves. Since calcium chloride is an ionic compound, it dissociates into its constituent ions when dissolved in water. For every mole of calcium chloride that dissolves, one mole of calcium ions (Ca2+) and two moles of chloride ions (Cl-) are produced.

So, the number of moles of chloride ions produced is twice the number of moles of calcium chloride that were dissolved:

0.214 moles CaCl2 * 2 moles Cl- / 1 mole CaCl2

=> 0.428 moles Cl-

Finally, to determine the concentration of chloride ions in the solution, we need to divide the number of moles of chloride ions by the volume of the solution. The volume of the solution can be calculated from its mass and density:

=> 375 g solution / 1.05 g/mL

=> 358.33 mL

Now we can calculate the concentration of chloride ions in moles per milliliter (mM):

=> 0.428 moles Cl- / 358.33 mL

=> 0.012 mM Cl-

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Answer:

348 g FeCO3

Explanation:Use your 3 mol's and find the atomic number of Iron II and CO3 which i think is 115.854 so you multiply it by the 3 and that should give you your grams in FeCO3.

A 64g sample of germanium-66 is left undisturbed for 12.5 hours. at the end of that period, only 2.0g remain. The half-life of germanium-66 is approximately 2.5 hours.

To find the half-life of germanium-66, we can use the formula N(t) = N0 * (1/2)^(t/T), where N(t) is the remaining amount at time t, N0 is the initial amount, T is the half-life, and t is the time elapsed. We have N(t) = 2g, N0 = 64g, and t = 12.5 hours. Plugging these values into the formula, we get:
2 = 64 * (1/2)^(12.5/T)
Now, we need to solve for T. First, divide both sides by 64:
(2/64) = (1/2)^(12.5/T)
Simplify the left side:
1/32 = (1/2)^(12.5/T)
Next, take the logarithm of both sides:
log2(1/32) = (12.5/T) * log2(1/2)
Solve for T:
T = 12.5 / log2(32)
T ≈ 2.5 hours
Therefore, the half-life of germanium-66 is approximately 2.5 hours.

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The cosine function of a chemical reaction that occurs at temperatures between 40 and 180 degrees Celsius is \(f (t) = -70\cos \left(\frac{\pi}{6}\right)t+110\).  Option c is the correct expression.

A cosine function's amplitude is equal to half the vertical distance between its highest and lowest points. The distance between the tallest point and the center line is equal to this.  This is of the form f (t) = A cos (bt)+k where A is the wave amplitude, t is the time period, and k is the vertical displacement.

In this problem, the temperature is measured by f(t), which ranges from 40 to 180 degrees Celsius. Then the temperature is not negative. The amplitude will be,

\(A=\frac{|180-40|}{2}=70\)

Given the time period is 12 hours.

\(\begin{aligned}\text{Period}&= \frac{2\pi}{b}\\12&= \frac{2\pi}{b}\\b&= \frac{2\pi}{12}\\b&=\frac{\pi}{6}\end{aligned}\)

When, t = 0, the wave must be at its lowest point. Then, f(t)=40. Find k using this.

\(\begin{aligned}f(t=0)&=40\\40&=-70\cos\left(\frac{\pi}{6}\times 0\right)+k\\40&=-70+k\\k&=110\end{aligned}\)

The required cosine function will be of the form, \(f (t) = -70\cos \left(\frac{\pi}{6}\right)t+110\)

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Enthalpy of vaporization for the compound will be close to 24.3 kJ/mol. The enthalpy of vaporization is also known as the (latent) heat of vaporization or heat of evaporation.

In (p2/p1) = ΔH vap / R × ( 1 / T1 - 1 /T1 )

P1, P2 - the vapor pressure at 273 K and 325 K, respectively

ΔHvap  - the enthalpy of vaporization;

T1, T2 - the two temperatures given to you.

ΔH vap = In (p2/p1) ×  R / ( 1/ T1 - 1 /T2 )

ΔH vap = ( In (135 torr / 24.3 torr) ×  8.314 J / mol ×  k ) / (1/273 - 1/325 ) K^ -1

ΔH vap = ( 1.7148 ×  8.314 J/mol ) / 0.0005861 = 24324.9 J/mol

ΔH vap ≈ 24.3 kJ/mol

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The Lewis structure of HCI, also known as hydrogen chloride, is a useful tool for understanding the molecular structure of this compound and its behavior in chemical reactions.

The Lewis structure of HCI shows that it is composed of one hydrogen (H) atom and one chlorine (Cl) atom. The hydrogen atom has one valence electron, and the chlorine atom has seven valence electrons.The hydrogen and chlorine atoms bond covalently to form HCI, with the hydrogen atom donating its electron to form a bond with the chlorine atom.

It's important to note that it represents only the basic arrangement of atoms and bonds in the molecule, and does not take into account the movement of electrons and the dynamic nature of chemical bonds.

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River samples may evidence problems with the water treatment plant because it may contain an excessive amount of certain substances which are filtered during this procedure.

A water treatment plant is a place where wastewater from a city is processed and purified in order to obtain potable water.

Water treatment procedure generally involves the collection, chemical substance addition, filtration, and disinfection.

Any type of problem in these steps can be evidenced by taking a sample of the water after treatment.

In conclusion, river samples evidence problems due to an excessive amount of certain substances which are filtered during this procedure.

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A measure of how much solute can dissolve in a given amount of solvent. A substance's solubility in water is the greatest amount of that material that can dissolve in 100 grams of water at a specific temperature. The solubility of BaCrO₄ is 2.787.

The equilibrium constant for a solid material dissolving in an aqueous solution is the solubility product constant, Ksp. It stands for the degree of solute dissolution in solution. A substance's Ksp value increases with how soluble it is.

Ksp = [Ba²⁺][CrO₄²⁻]

Ksp = S × S

S² = Ksp

\(S=(K_{sp} )^{1/2}\)

\(S=(1.2 * 10^{-10} )^{1/2}\)

\(S=1.10*10^{-5} mol/L\)

[Ba²⁺] = 1.10 × 10⁻⁵ mol/L

[CrO₄²⁻] = 1.10 × 10⁻⁵ mol/L

ppm = Molarity × molecular mass × 1000

ppm = 1.10 × 10⁻⁵ × 253.37 × 1000

ppm = 2.787

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Your question is incomplete, the complete question is:

what is the solubility of barium chromate in parts per million if the value of Ksp is 1.2×10⁻¹⁰.

Solid is the state in which matter maintains a fixed volume and shape; liquid is the state in which matter adapts to the shape of its container but varies only slightly in volume; and gas is the state in which matter expands to occupy the volume and shape of its container.??.....

Answer:

D.Salad

Explanation:

A mixture is a substance that combines two or more substance that are physically combined. A mixture can be easily seperated by a physical means . A mixture is the combination of various substances that are not chemically combined .Examples of mixtures are cake and salad . The  cake contains various substances like egg, flour and sugar. This mixture can be easily separated into it individual entities by a physical means .

Base on the option the only mixture among the option is salad . Salad is a a mixtures that combines substances like tomatoes , fruits and vegetable. The individual substances that makes up the salad can be easily separated.

Sugar is a compound . Water is a compound as it contains two elements and potassium is an element.

Answer:

D

Explanation:

hope this helps you please mark brainliest ☺♦♦♦

The answer is B) a fossil fuel.This reaction represents the combustion of methane (CH4), which is a primary component of natural gas, a fossil fuel. The combustion reaction occurs when methane reacts with oxygen (O2) to produce carbon dioxide (CO2), water (H2O), and energy (in the form of heat).

This is because CH4, or methane, is a hydrocarbon that is commonly found in natural gas, which is a type of fossil fuel. When fossil fuels are burned, they undergo a combustion reaction, releasing energy in the form of heat and/or light. The equation provided is an example of a combustion reaction, as it shows methane reacting with oxygen to produce carbon dioxide, water, and energy in the form of heat (represented by the positive value of 802.5 kJ). The energy stored in fossil fuels originally comes from the sun, but the process of converting that energy into a usable form involves the formation and burning of fossil fuels.
The original source of energy for the reaction CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) + 802.5 kJ is:

B) a fossil fuel

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Answer:

Lids can be made of the same material as the pan or glass. Glass lids are made of tempered (strengthened) glass. A glass lid lets the cook watch the food cooking and usually has a reinforcing stainless steel rim.​

Answer: These are most commonly made out of stainless steel or polycarbonate, as these materials can withstand a wider range of temperatures, but polypropylene and polyethylene lids are also available

Explanation:

Answer:

photosynthesis

Explanation:

Answer:

Photosynthesis

Explanation:

I had it on a quiz.

Answer:

I believe it's a.

Explanation:

The work done during this reaction is -0.1013 kJ. Therefore, the correct option is 2) -7.3 kJ.

According to the question, the work done during a reaction in which the internal volume expands from 0.75 L to 1.25 L against an external pressure of 2 atm has been asked to calculate. The formula for work done by a system can be given as: Work = -PΔV Where P is the external pressure and ΔV is the change in volume of the system. The pressure is given as 2 atm, the change in volume can be calculated as:

ΔV = Vf - ViΔV

= 1.25 L - 0.75 L

= 0.5 L

Now, putting the given values into the formula of work, we get:Work = -PΔVWork = -(2 atm)(0.5 L)Work = -1 atm L The units of atm L are not in standard units of Joules, but we can convert them using the conversion factor 1 atm L = 101.3 J Therefore, Work = -1 atm L × 101.3 J/atm L Work = -101.3 J = -0.1013 kJ.

Thus, the work done during this reaction is -0.1013 kJ. Therefore, the correct option is 2) -7.3 kJ.

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Answer:

Eliptical

Explanation:

While some orbits may seem circular, like Earth's, it is still an ellipse. Planets orbit stars in an elliptical shape, but some come very close to perfect circles. As for the other two, im certain you have never seen a triangular or spherical orbit. Hope this helps.

Out of the given options, none of the following have the empirical formula CHO.

The empirical formula is the simplest formula for a compound that reflects the ratio of elements present in the compound. It gives the ratio of atoms of different elements in the compound. The empirical formula can be different from the molecular formula.

Lipids are the biomolecules that are composed of carbon, hydrogen, and oxygen (CHO) in a different ratio. They are the esters of fatty acids and glycerol. They are also known as fats or oils. They are the major component of cell membranes. Lipids include fats, phospholipids, and steroids.

Nucleic acids are macromolecules composed of nucleotide units. Nucleotide units consist of a nitrogenous base, a sugar, and a phosphate group. They are the building blocks of DNA and RNA. The empirical formula of nucleic acids is C5H4O2N3P. They contain nitrogen, phosphorus, carbon, oxygen, and hydrogen. They do not have the empirical formula CHO.

Proteins are macromolecules composed of amino acids. They have a complex structure. Proteins are composed of carbon, hydrogen, oxygen, and nitrogen. Some proteins also contain sulfur and phosphorus. Therefore, they do not have the empirical formula CHO. Thus, out of the given options, none of the following have the empirical formula CHO.

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Here is a MATLAB code that calculates and plots the concentration profiles of NH ₃, NH₄+, NO₂-, and NO₃- as a function of time at T=298 K and neutral pH, given the rate constants and initial concentrations:

```matlab

% Rate constants (k) and initial concentrations ([C])

k1 = 0.1;   % Rate constant for NH₃ + H₂O₂ -> NH₂ + H₂O

k2 = 0.05;  % Rate constant for NH₂ + NO₃- -> NO₂- + H₂O

k3 = 0.08;  % Rate constant for NO₂- -> NO₃- + N₂

C_NH₃ = 1.0;    % Initial concentration of NH₃

C_H2₂O₂ = 0.5;   % Initial concentration of H₂O₂

C_NH₄ = 0.0;    % Initial concentration of NH₄+

C_NO₂ = 0.0;    % Initial concentration of NO₂-

C_NO₃ = 0.0;    % Initial concentration of NO₃-

% Time vector

t = 0:0.1:10;   % Time range from 0 to 10 with a step size of 0.1

% Calculation of concentrations at each time point

for i = 1:length(t)

   NH₃(i) = C_NH₃ * exp(-k1*t(i));

   NH₄(i) = C_NH₃ - NH₃(i);

   NO₂(i) = C_NO₂ + k₂ * (NH₄(i) - C_NH₄) * t(i);

   NO₃(i) = C_NO₃ + k₃ * NO₂(i) * t(i);

end

% Plotting concentration profiles

plot(t, NH₃, 'r-', t, NH₄, 'g-', t, NO₂, 'b-', t, NO₃, 'm-');

xlabel('Time');

ylabel('Concentration');

legend('NH₃', 'NH₄+', 'NO₂-', 'NO₃-');

```

The provided MATLAB code calculates and plots the concentration profiles of NH₃, NH₄+, NO₂-, and NO₃- as a function of time based on the given rate constants and initial concentrations. The code uses a time vector to define the time range for which the concentrations will be calculated.

Inside the for loop, the concentrations of NH₃, NH₄+, NO₂-, and NO₃- are calculated at each time point using the given rate constants and the previous concentrations. The concentration of NH₃ decreases exponentially over time due to the reaction NH₃ + H₂O₂ -> NH₂ + H₂O, where k1 is the rate constant. NH₄+ concentration is the difference between the initial NH₃ concentration and the current NH₃ concentration.

The concentration of NO₂- increases with time due to the reaction NH₂ + NO₃- -> NO₂- + H₂O, where k₂ is the rate constant. The change in NH₄+ concentration from its initial value is multiplied by k₂ and the time to calculate the increase in NO₂- concentration.

Finally, the concentration of NO₃- increases with time due to the reaction NO₂- -> NO₃- + N₂, where k₃ is the rate constant. The previous NO₂- concentration is multiplied by k₃ and the time to determine the increase in NO₃- concentration.

The resulting concentration profiles are then plotted using the plot function, with time on the x-axis and concentration on the y-axis. Each compound is represented by a different color line in the plot.

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Among the given options, solid calcium will have the greatest increase in temperature when equal masses of these substances absorb equal amounts of thermal energy. This is because solid calcium has the lowest specific heat capacity, meaning it requires less heat energy to increase its temperature compared to the other substances.

The substance that will have the greatest increase in temperature when equal masses absorb equal amounts of thermal energy is the substance with the lowest specific heat capacity. Specific heat capacity is the amount of heat energy required to raise the temperature of a substance by a certain amount. Looking at the given options, we can compare the specific heat capacities of water, ammonia gas, aluminum metal, and solid calcium. Water has the highest specific heat capacity of 4.18 J/goC, which means it requires a large amount of heat energy to raise its temperature. Ammonia gas has a specific heat capacity of 2.1 J/goC, aluminum metal has a specific heat capacity of 0.90 J/goC, and solid calcium has the lowest specific heat capacity of 0.476 J/goC. Therefore, among the given options, solid calcium will have the greatest increase in temperature when equal masses of these substances absorb equal amounts of thermal energy. This is because solid calcium has the lowest specific heat capacity, meaning it requires less heat energy to increase its temperature compared to the other substances.

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The structural formula of a chemical compound is a graphic representation of the molecular structure, which shows how atoms are arranged or spatially distributed. The chemical bonds within the molecule are shown, either explicitly or implicitly.

a) If we look at the structure of propanol then it is having single bonds with one alcohol (OH) group. In such a case, the closest homologues which cab be formed will be ketone and aldehyde.

b) Isomers can be of different types. In this the structural formula is talked about so we will take into account only about the structural isomer. Structural isomer is the arrangement of compound in which the number of bonds and elements remains same but the structure is different. In propanol, the OH group can come in the mid carbon and that carbon can also have a methyl group attached to it.

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The first reaction is,

Each of the following reactions is catalyzed by an enzyme. For each reaction, classify the enzyme according to one of the six main classes suggested by the International Union of Biochemistry.

(Image attached to the end of the solution)

in first reaction HYDROLASE enzyme as clearly, it is a hydrolysis reaction

in 2nd reaction OXIDOREDUCTASE is the answer as it is a reduction reaction

Reduction, any of a class of chemical reactions in which the number of electrons associated with an atom or a group of atoms is increased. The electrons taken up by the substance reduced are supplied by another substance, which is thereby oxidized.

REDUCTION can be identified as:

* Removal of oxygen

* Addition of hydrogen

* Decrease in valency of metal ion\((e.g.\) \($\mathrm{Fe}+2$\)\(? $\mathrm{Fe}+3)$\)

and the last one is clearly isomers of each other hence ISOMERASE.

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The entire amount of greenhouse gases (such as carbon dioxide and methane) produced by human actions is known as a carbon footprint. One of the highest rates in the world, the average carbon footprint of a person in the United States is 16 tonnes.

As we drive, heat our homes with oil or gas, consume fuel for transportation, or use electricity produced from coal, natural gas, or oil, we all emit greenhouse gases.

Described by the WHO as a weight of CO2, a carbon footprint is a measurement of the effect your actions have on the amount of carbon dioxide (CO2) created by the combustion of fossil fuels.

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a. The conjugate acid of HSO3- is HSO4-.The conjugate acid is formed by the addition of a proton (H+) to the sulfur atom in the sulfurous acid molecule (HSO3-). The sulfur atom becomes a sulfate ion (SO42-), and the hydrogen atom becomes a hydroxide ion (OH-).

b. The conjugate acid of F- is HF

The conjugate acid is formed by the addition of a proton (H+) to the fluoride ion (F-). The fluoride ion becomes a hydrogen fluoride ion (HF), which is a strong acid that ionizes in water to form H3O+ and HF- ions.

c. The conjugate acid of PO43- is H2PO4-.

The conjugate acid is formed by the addition of a proton (H+) to the phosphate ion (PO43-). The phosphate ion becomes a phosphate ion (H2PO4-), which is also known as orthophosphoric acid.

d. The conjugate acid of CO is CO2-.

The conjugate acid is formed by the addition of a proton (H+) to the carbon atom in the carbon monoxide molecule (CO). The carbon atom becomes a carboxyl group (COOH), and the hydrogen atom becomes a hydrogen ion (H+). The resulting compound is CO2-, which is also known as carbonic acid.  

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According to the question, the pH of the solution after the addition of 50.0 mL of HNO₃ is 4.74.

pH is a measure of the acidity or alkalinity of a solution. It is measured on a logarithmic scale from 0 to 14, with 7 as the neutral point. Solutions with a pH lower than 7 are considered acidic, whereas solutions with a pH higher than 7 are considered basic or alkaline. Lower pH values indicate a higher concentration of hydrogen ions, while higher pH values indicate a higher concentration of hydroxide ions.

The pH of the solution after the addition of 50.0 mL of HNO₃ can be calculated using the Henderson-Hasselbalch equation.

pH = pKa + log (base/acid)

Where pKa is the -log of the acid dissociation constant (Kb) of NH₃ (1.8 x 10-5), base is the concentration of NH₃ in the solution (0.10 M), and acid is the concentration of HNO₃ in the solution (0.10 M).

pH = -log(1.8 x 10-5) + log(0.10/0.10)

pH = -log(1.8 x 10-5)

pH = 4.74

Therefore, the pH of the solution after the addition of 50.0 mL of HNO₃ is 4.74.

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True. The Genuine Progress Indicator (GPI) incorporates adjustments to GDP in order to provide a more comprehensive measure of societal progress rather than focusing solely on economic activity.

The statement is true. The GPI is an alternative economic indicator that takes into account various factors beyond traditional economic measures like GDP. It aims to provide a more holistic view of societal progress by considering social, environmental, and economic factors.

Unlike GDP, which primarily measures the monetary value of goods and services produced within a country, the GPI adjusts for certain aspects that affect well-being but are not adequately captured by GDP. These adjustments include factors such as income inequality, environmental degradation, the value of unpaid household work, and the depletion of natural resources.

By incorporating these adjustments, the GPI offers a more nuanced understanding of the overall well-being and sustainability of a society. It recognizes that economic growth alone does not necessarily translate into improved quality of life or societal progress. The GPI provides policymakers and researchers with a tool to assess and compare the overall welfare and progress of different regions or countries beyond just economic indicators like GDP.

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Based on the given statement, Katherine has expressed her wishes in regards to her medical treatment in the event that she is unable to make decisions for herself.

Based on the given statement, Katherine has expressed her wishes in regards to her medical treatment in the event that she is unable to make decisions for herself. This document is commonly referred to as a living will, which outlines an individual's preferences for end-of-life care. In some states, a durable power of attorney for health care may also be created to appoint a trusted individual to make medical decisions on behalf of the patient. However, it is important to note that the laws and requirements regarding advanced directives can vary by state. It is recommended to consult with an attorney or healthcare professional to ensure that all legal and medical considerations are properly addressed when creating these documents. Additionally, it is crucial to regularly revisit and update these documents to reflect any changes in personal preferences or medical conditions.

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Answer:

emprical weight=ch2o

=12*12*1*1*16 =30

Molecular mass=n*emprical weight

60=n*30

N=60/30=2

Molecular formula=n*emprical formula=2*30

=60

C2h4o2

Hope this helps :)

Answer:

The correct option is the second option

Explanation:

Generally, the aim of science is to understand a particular concept in the best and the most correct way possible; hence experiments are done and repeated to ensure an explanation is actually true about a concept or need modification.

The atomic models have also been a "beneficiary" of this process. The different atomic models are usually been improved upon as scientists leaned more. For example, the Dalton's atomic theory has been modified to a more correct atomic description; some of which are shown below

(1) Dalton's theory suggested that an atom is the smallest unit of a molecule. We know now from different experiments (by J. J Thompson and Rutherford) that atoms are not the smallest molecules and are made up of smaller particles known as protons, neutrons and electrons.

(2) Dalton's theory suggested that atoms of the same elements are alike in all aspects. The knowledge of isotopy shows this is not always the case. As atoms of the same elements (isotopes) have the same atomic number but different mass number; hence cannot be said to be the same in all aspects.

(3) Dalton's theory also suggested that when atoms react, they do so in fixed, simple whole number ratio. The knowledge of organic chemistry shows atoms do not always react in simple whole number ratios

There are several modifications to different postulations by scientists that have also occurred aside from this, hence the most correct answer is that "As scientists learned more, they modified the atomic model"

Answer:

B

Explanation:

Answer:

d. The acid is likely to eat through the can.

Explanation:

Aluminium is a metallic element found in group 3 of the periodic table. Aluminum is a very reactive metal owing to the fact that it reacts with almost every substance it comes in contact with e.g air, acids, bases etc.

In this question where Derek stores his Hydrochloric acid (HCl) remnant, after an experiment, into a can made of aluminum. What will happen is that the acid is likely going to eat through the can. This might occur gradually but will eventually. Aluminum protects itself from further reactions by forming a layer of Aluminum oxide (Al2O3) when it reacts with air.

This is what keeps the reaction with HCl gradual but the acid will eventually permeate the layer and corrode the aluminum can by reacting with the aluminum.