Extra Stoichiometry Practice
1. How many grams of aluminum oxide can be formed by the reaction of 38.8 g of aluminum with
oxygen?
4 Al (8) + 3 O2(g) →2 A12O(s)

The correct answer is 1.776 atm, which is the rounded value of the conversion from 1350 mmHg to atm.

To convert 1350 mmHg to atm, you need to use the conversion factor between millimeters of mercury (mmHg) and atmospheres (atm). The conversion factor is 1 atm = 760 mmHg.

To convert mmHg to atm, divide the value in mmHg by 760:

1350 mmHg / 760 mmHg/atm ≈ 1.776 atm

Therefore, 1350 mmHg is approximately equal to 1.776 atm.

It's important to note that the conversion factor of 1 atm = 760 mmHg is based on the definition of atmospheric pressure at sea level and at a specific temperature. The actual conversion may vary slightly depending on atmospheric conditions.

So, the correct answer is 1.776 atm, which is the rounded value of the conversion from 1350 mmHg to atm.

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In this example, the exam, Carlos concerns, and his behavior may be seen as an example of eustress.

Stress is a normal physiological and psychological reaction that people have in response to their surroundings. Eustress refers to positive, motivating stress that improves functioning, whereas distress refers to negative, overwhelming stress that impairs functioning.

Eustress refers to positive stress, which can be psychological, physical, or biochemical/radiological. Endocrinologist Hans Selye coined the term, which combines the Greek prefix eu-, which means "good," and stress, which literally means "good stress." Eustress refers to beneficial stress, which can be psychological, physical, or biochemical/radiological in nature.

Since Carlos has a comprehensive final exam in three weeks that he is concerned about and this made him to go ahead and start studying, this is eustress.

Exhilarating rides, competition, and a good scary movie are all examples of Eustress.

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Complete question

Carlos has a comprehensive final exam in three weeks that he is concerned about. His concerns prompt him to go ahead and start studying and in doing so, he feels less worried as the exam approaches. In this example, the exam, Carlos concerns, and his behavior may be seen as an example of ?

Answer:

Try googling it that will help. If not I don't know?

Explanation:

Answer:

The Solar Nebula Theory accounts for the creation of solar systems, stars, and planets. The theory accounts for planet composition by stating that iron compounds, silicates, and dust clump together to form planetesimals. Because of the proximity of the sun, ices and gases cannot condensate near them, so they do not become gas giants. The planetesimals then collide together due to gravity and collect to form our rocky planets.

Explanation:

Answer:

gravity

Explanation: its a force that pulls you down but you are never making contact with it

Answer: Gravity

Explanation:

It pushes you down but you never actually touch it

Given the fact that we are seeing a rise in the temperature of the globe, the artic animals in that ecosystem must adapt by a reduction in the rate of metabolism.

Several evidences continue to emerge that the temperature of the earth have continued to increase and this is largely due to the fact that since the turn of the twentieth century and the rise of industrialization, there have been a rise in the emission of the carbon dioxide and other green house gases into the environment. As a result of this, the temperature of the earth has continued to rise steadily leading to the melting of the ice cover and the destruction of ecosystems that are found around the artic regions of the earth.

Now, we know that an organism is able to adapt to the changes that occur in its habitat by being able to alter some of its structure and function.

Given that the organisms that live in the artic are adapted to cold regions and low temperatures, the metabolic rate of the organisms is high in order to produce heat.

As a result of the rise in global temperatures, the organisms would have to reduce their rate of metabolism.

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1.the smallest things that can carry out life proccess

Answer:

Zinc Carbonate

Zinc Nitrate

Explanation:

Answer:

2.38 g of oxygen (O2).

Explanation:

What is given?

Mass of potassium chlorate (KClO3) = 6.06 g.

Molar mass of KClO3 = 122.4 g/mol.

Molar mass of oxygen (O2) = 32 g/mol.

Step-by-step solution:

First, let's state the balanced chemical equation. Remember that the decomposition of a compound produces two or more products:

Now, let's convert 6.06 g of KClO3 to moles using its molar mass:

You can see in the chemical equation that 2 moles of KClO3 produce 3 moles of O2. By doing a rule of three with this data, we obtain that:

The final step is to convert from 0.0743 moles of O2 to grams using its molar mass, like this:

The answer is that we will produce 2.38 g of oxygen (O2) from the decomposition of 6.06 g of potassium chlorate (KClO3).

The specific heat of the metallic element rhodium is 0. 240 j/g-k at 25°c. If 586 j of heat is added to an 80. 0 g block of rhodium metal that is initially at 25. 0°c,  the expected final temperature of the block 55.5 °C.

As we know heat is equal to:

Q= mcΔT

Given values:

M= 80 g

C = 0.240 J/g K

Q= 586 J

To find final temperature

ΔT = 586 / 80 x 0.240 = 30.5 °C

Final temperature =25 + 30.5 = 55.5 °C

The final temperature is  55.5 °C.

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The name of the chemical formula ZnO is zinc oxide.

Chemical  formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols of elements. It also makes use of brackets and subscripts.

Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form  is called empirical formula.

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Answer:

Explanation:

I'm not sure what is being asked, not the units of "1.5."  I don't know of potassium "ioxicide."  Was "dioxide" intended?

I'll assume the question is "What is the concentration, in Molar, of 1.5g of potassium dioxide in 150cm^3 of water (150cm^3 is 150 ml).

The molar mass of K2O, potassium dioxide, is 94.2 g/mole.  1.5g is (1.5g/94.2 g/mole) or 0.0159 moles of K2O.  The definition of Molar is moles/liter.  So take the moles of K2O and divide by the liters, which is 0.150L in this case.

(0.0159 moles K2)/0.150 L  = 0.106 M K2O

Answer:

D

Explanation:

The two atoms must be of the same element in order for two atoms  to share electrons equally in a chemical bond.

An element is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.

Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.

The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.

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a) The Lennard-Jones potential predicts the separation r_eq at the minimum energy U_min.

b) The U_min for this interaction at T=298 K is the value obtained from the Lennard-Jones potential equation when r=r_eq.

c) The ratio of U_min to the purely attractive van der Waals component of the interaction potential at r_eq can be calculated by comparing the attractive part (-A/r^6) to the total potential energy U_min.

d) The ratio of r_eq to r_0, where u(r_0)=0.4, can be determined by finding the value of r_eq where the potential energy is equal to 0.4 times the total potential energy at r=r_0.

e) The ratio of r_s to r_0, where r_s is the separation where the magnitude of the attractive adhesion force is maximum, can be determined by finding the value of r where the derivative of the potential energy with respect to r is equal to zero.

f) The value of F_max between the two atoms can be obtained by taking the negative derivative of the potential energy equation with respect to r and evaluating it at r=r_s.

a) The Lennard-Jones potential provides information about the relationship between energy and separation between two interacting atoms.

At the minimum energy (U_min), the potential predicts the separation r_eq, which corresponds to the equilibrium distance between the atoms. This is the distance at which the energy of the system is at its lowest point.

b) To determine the value of U_min at a given temperature (T=298 K), you can substitute the equilibrium separation r_eq into the Lennard-Jones potential equation and calculate the resulting energy value.

This will give you the U_min for the interaction.

c) The Lennard-Jones potential consists of two components: an attractive component (-A/r^6) and a repulsive component (B/r^12).

The ratio of U_min to the purely attractive van der Waals component of the interaction potential at r_eq can be calculated by comparing the magnitude of the attractive component to the total potential energy at the equilibrium separation.

This ratio provides insights into the relative contribution of the attractive force to the overall potential energy at equilibrium.

d) The ratio of r_eq to r_0 can be determined by finding the value of r_eq where the potential energy is equal to 0.4 times the total potential energy at r=r_0.

In other words, you need to solve the Lennard-Jones potential equation for r_eq when the potential energy is equal to 0.4 times the potential energy at r=r_0.

e) The ratio of r_s to r_0 is obtained by finding the value of r where the magnitude of the attractive adhesion force is maximum.

This can be determined by finding the separation r where the derivative of the potential energy equation with respect to r is equal to zero.

The value of r_s represents the separation at which the attractive force between the atoms is strongest.

f) The value of F_max between the two atoms can be obtained by taking the negative derivative of the Lennard-Jones potential energy equation with respect to r and evaluating it at r=r_s.

This will give you the magnitude of the maximum attractive adhesion force between the atoms.

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There are 0.250 moles in 25.3 g of potassium nitrate.

To calculate the number of moles in a given mass of potassium nitrate (\(KNO_3\)), you need to follow these steps:

1. Determine the molar mass of potassium nitrate:
- Potassium (K): 1 x 39.1 g/mol = 39.1 g/mol
- Nitrogen (N): 1 x 14.0 g/mol = 14.0 g/mol
- Oxygen (O): 3 x 16.0 g/mol = 48.0 g/mol

The molar mass of \(KNO_3\) = 39.1 + 14.0 + 48.0 = 101.1 g/mol

2. Use the mass given (25.3 g) and the molar mass of \(KNO_3\) to find the number of moles:

Number of moles = mass (g) / molar mass (g/mol)

Number of moles = 25.3 g / 101.1 g/mol = 0.250 moles

So, there are 0.250 moles in 25.3 g of potassium nitrate.

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Answer:

Hit me with brainlist pls

Explanation:

A equals 6.8 and C is the final answer of the equation so you would subtract the answer from a which gives you 2.6 grams

Answer:

Pd (palladium).

Explanation:

46 electrons total, this is representative of the Pd (palladium) element.

Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Palladium (Pd) element is represented by the ground state electronic configuration.

Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.

The ground state electronic configuration of 1s² 2s² 2p⁶3s² 3p⁶4s² 3d¹⁰ 4p⁶ 5s² 4d⁸ shows total 46 electrons. The element with atomic number 46 is palladium, Pd. Palladium is a d block element. Palladium is found in group 8 and period four of periodic table.

Therefore, palladium (Pd) element is represented by the ground state electronic configuration.

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Answer:

It is a physical change, because you DID NOT chemically change the waters compound just by boiling it.

Explanation:

I hope this helps!

Answer:

Boiling is a physical change!

(Edited bc the person who commented told me it was physical and not to make anyone being confused when the look at this post so... yeah)

The carbon engineering technologies forward the carbon dioxide capturing methods. The first step involved in the air contactor is given below:

\(\rm CO_{2} + 2 KOH \rightarrow H_{2}O + K_{2}CO_{3}\)

Nowadays evolution of greenhouse gases such as carbon dioxide is causing serious issues such as global warming. Industries and factories are uncontrollably release these gases to the atmosphere.

Carbon engineering designs the techniques for direct capture of carbon dioxide. The methods include an air contactor with the reaction given above and a pelletizer where, the KOH and calcium carbonate produces calcium hydroxide.

A calcinator decomposes the calcium carbonate forming the carbon dioxide  which is  captures.

\(\rm CaCO_{3} \rightarrow CO_{2} + CaO\)

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The ratio of argon-40 to potassium-40 two half-lives after the rock has formed is 7:1.

The half-life of a radioactive compound tells us the time needed for half of the atoms of any compound to go through the radioactive decay.

We know that, half-life of potassium-40 is 1.25 billion years because this is how long it takes for half of the number of atoms which are present in the sample to decay to argon-40.

The half-life of potassium-40 which decays by the beta emission is 1.28 × 10⁹ years. The half-life of potassium-40 which decays by the positron emission is 1.19 × 10¹⁰ years.

40 K which naturally occurs decays to the stable 40 Ar which is 11.2%, It happens by the capture of electron and by positron emission. It gets decayed to stable 40 Ca (88.8%) by emission of negatrons. Half-life of 40 K 1.25 x 10⁹ years.

The dating method of potassium-argon is specifically useful in determining the Lava age.

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This problem is providing statements whereby an student is pretending to explain a wrongly-classified non-redox reaction via the change in the oxidation numbers the elements undergo as it takes place. It is asked to report where the student went wrong and to determine whether the reaction is redox or not.

In such a way, we can start by saying that the student was right about the +1 on H and -1 on I but just on HI, not on the diatomic gases too, because when the elements act alone in a chemical equation, their oxidation states must be 0 as they are not forming any ions.

Next, we can go over the identification of the reaction as redox, by writing the correct oxidation numbers in the considered chemical equation:

\(I_2^0(g)+H_2^0(g)\rightleftharpoons 2H^+I^-(g)\)

Which exhibits an oxidation half-reaction for hydrogen because it changed from 0 to +1 and a reduction half-reaction for iodine because it changed from 0 to -1, and thus, when the oxidation numbers change, we say the reaction is redox.

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Answer:

Youngest - limestone with crinoid

2nd - shale with ammonite

3rd -  sandstone with trilobite

oldest - conglomerate rock

Explanation:

Answer:

Coke

Explanation:

A solid fuel formed by heating coal in the absence of air is coke. Coke is black colored, tough porous substance. It is pure carbon.

The statement that is true regarding beta particles is D. "Beta-particle formation is accompanied by the conversion of a neutron into a proton."

Beta particles are high-energy electrons or positrons that are emitted during certain types of radioactive decay processes. Beta decay occurs when an unstable nucleus undergoes a transformation in order to reach a more stable state. In beta-minus decay, a neutron in the nucleus is converted into a proton, releasing a beta particle (high-energy electron) and an antineutrino. The conversion of a neutron into a proton increases the atomic number of the nucleus by one.

The statement that beta particles have a mass number of 0 is incorrect. Beta particles do have mass, although they are much less massive compared to protons or neutrons. Similarly, the statement that beta particles have an atomic number of 1 is incorrect. The atomic number refers to the number of protons in an atom, and beta particles are not atoms themselves. Beta particles are high-energy particles emitted from the nucleus during beta decay.

Therefore, the only true statement regarding beta particles is that their formation is accompanied by the conversion of a neutron into a proton, which leads to an increase in the atomic number of the nucleus. Therefore, Option D is correct.

which of the statements regarding beta particles are true?

A. beta particles have a mass number of 0.

B. beta-particle formation is accompanied by the conversion of a proton into a neutron.

C. beta particles have an atomic number of 1.

D. beta-particle formation is accompanied by the conversion of a neutron into a proton.

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