Chemistry Question Help Please!
Use the phase diagram for water to answer the following questions.

35℃ and 85 kPa
-15℃ and 40 kPa
-15℃ and 0.1 kPa
60℃ and 50 kPa

Using the graph above, describe the phase changes that are in equilibrium along each black line. Describe what those equilibria mean.

The boiling point for nitrogen is -195.8℃. Imagine that you had a sealed container of nitrogen gas at room temperature. What are two ways that you could turn the gas into a liquid?

Answer:

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Explanation:

hahhahahahahhaahah oki nam omy mymy mymy

Answer:

Galileo and Copernicus each proposed a heliocentric, or Sun-centered, a model of the solar system. In this model, the Sun sits at the center of the solar system. The Moon rotates around the Earth, but like the other planets, the Earth rotates around the Sun Gravity keeps the planets in orbit around the Sun.

Increases the pressure          l

_____________________

Removing Energy                    l

Answer:

4.15×10²² atoms of C are contained in 1 g of butane.

Explanation:

Formula for butane is C₄H₁₀

1 mol of butane contains 4 moles of carbon and 10 moles of H

Molecular weight is 58 g/mol

In conclussion we can say that 58 g of butane contain 4 moles of C and 10 moles of H

We prepare the rule of three:

1 g . 4 moles of C / 58g = 0.0689 moles of C

Now we can count the atoms by NA. We know that 6.02×10²³  particles are contained in 1 mol of anything.

0.0689 mol . 6.02×10²³ atoms / 1mol = 4.15×10²²

4.15×10²² atoms of C are contained in 1 g of butane.

Compared to 2,3,4-trifluoropentane, the nonane's carbon chains are longer.

A substance's molar mass is defined as its molecular weight in grams. By adding the molar masses of a substance's constituent atoms, we may get the substance's molar mass. Then, to convert between mass and the quantity of moles of the material, we may utilize the computed molar mass.

Adding the atomic masses of a particular substance results in the calculation of molar mass. Below each element's symbol on the periodic table is a designation of the mass of that specific element. The molar mass is obtained by averaging the atomic masses obtained from the periodic table.

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There are 576 different ways to choose a meal.

Promotional offers. A promotional offer is a specific proposition to clients that specifies a reward and patron behavioral standards for earning a reward. the recognition and trouble of the praise are captured thru a retail transaction, purchaser order, rebate claim, rebate redemption, or different patron interplay. a discount is a difference between the unique charge and the lower charge it's far being bought at. a proposal is a deal wherein a product is normally bought at a reduction.

Calculation:-

There are 8 appetizers, 12 entrees, and 6 desserts.

Number of choices =  8 × 12 × 6

                                =  576

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Answer:

Explanation:

7A 0.2

7B cork

7C  Yes because the lighter it is the more likely it will float

7D  Density is one of the fundamental scientific principles of life. It can describe any everyday object. Despite its significance, students often struggle to understand what it really is. Density is a measurement of how much space or volume is packed in an object or substance.

8   property means a characteristic or trait that you can use to describe matter by observation, measurement, or combination.

Answer and Explanation:

The color change of a pH indicator is caused due to the dissociation of protons H+. The most common indicators are: phenolphthalein, methyl red, and bromothymol blue, which are used to indicate pH ranges of about 8 to 10, 4.5 to 6, and 6 to 7.5, respectively. For each indicator, phenolphthalein goes from colorless to pink, methyl red goes from red to yellow, and bromothymol blue goes from yellow to blue.

The density of the iron placed in the water is 7.87g/mL.

Density is the measure of the mass of matter contained by a unit volume. The density of a substance can be calculated by dividing the mass of a substance by its volume as follows:

Density = mass ÷ volume

According to this question, one adds 9.6 g of iron to 23.60 mL of water and observe that the volume of iron and water together is 24.82 mL.

Volume of iron = 24.82mL - 23.60mL = 1.22mL

Density of iron = 9.6g ÷ 1.22mL

Density of iron = 7.87g/mL

Therefore, 7.87g/mL is the density of the iron.

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Answer:

CH2

Explanation:

The empirical formula gives the lowest whole number ratio of the elements. In this case, both subscripts can be divided by 20, hence CH2.

Answer:

a

Explanation:

pls sdame

Answer:

123.96 g Na₂O

Explanation:

4 Na  +  O₂  ⇒  2 Na₂O

You first need to find the limiting reagent.  Convert the reactants to moles and see which produces the least amount of product using the mole ratios in the chemical equation.

(91.96 g Na)/(22.99 g/mol Na) = 4 mol Na

(4 mol Na) × (2 mol Na₂O/4 mol Na) = 2 mol Na₂O

(32.0 g O₂)/(32.0 g/mol) = 1 mol O₂

(1 mol O₂) × (2 mol Na₂O/1 mol O₂) = 2 mol Na₂O

Since they both produce the same amount of product, you don't need to pick a limiting reagent.  Now, convert moles of Na₂O to grams.

(2 mol Na₂O) × (61.98 g/mol Na₂O) = 123.96 g Na₂O

Answer:

B. a nuclear reactor core (1000°C)......

Answer:

Ethyn gas ( acetylene gas )

Explanation:

All group II carbides react with water to form ethyn gas apart from beryllium which produces methane gas.

\({ \sf{CaC_{2(s)} + 2H _{2} O_{(l)} → Ca(OH) _{2(s)} + C _{2} H _{2(g)} }}\)

Answer:

Temperature, concentration, and a catalyst can all affect the rate of a chemical reaction.

Temperature: Increasing the temperature generally increases the rate of a reaction. This is because higher temperatures provide more kinetic energy to the reactant particles, causing them to move faster and collide more frequently. With increased collision frequency, the chances of successful collisions with sufficient energy to overcome the activation energy barrier and proceed with the reaction are also increased. As a result, the reaction rate typically increases with temperature.

Concentration: Increasing the concentration of reactants generally increases the rate of a reaction. When the concentration of reactant particles is higher, they become more crowded, increasing the likelihood of collisions between reactant particles. With more collisions occurring, there is a higher probability of successful collisions leading to a reaction. Therefore, higher reactant concentrations generally result in a higher reaction rate.

Catalyst: A catalyst is a substance that increases the rate of a reaction by providing an alternative reaction pathway with a lower activation energy. Catalysts themselves are not consumed during the reaction and do not undergo any permanent changes. They work by providing an alternative route that requires less energy for the reactants to reach the transition state. This lowers the activation energy barrier, making it easier for the reaction to occur. By providing an alternative pathway, catalysts increase the rate of reaction without being consumed in the process.

Regarding collision theory, the three key points required for a reaction to happen are:

Collision: Reactant particles must collide with each other for a reaction to occur. Collisions bring the reactant particles in close proximity, allowing them to interact and potentially form new chemical bonds.

Energy: Colliding particles must possess enough energy, equal to or greater than the activation energy, for the reaction to take place. Activation energy is the minimum energy required for the reactant particles to break existing bonds and initiate the formation of new bonds. Only collisions with sufficient energy can overcome the activation energy barrier and lead to a reaction.

Orientation: In addition to sufficient energy, the collision between reactant particles must occur with the correct orientation. This means that the particles must collide in a way that allows the necessary atoms or groups to come into contact and form new bonds. If the collision occurs with an incorrect orientation, the particles may simply bounce off each other without any reaction taking place.

In summary, according to collision theory, for a reaction to happen, reactant particles must collide with sufficient energy and the correct orientation. Temperature and concentration affect the rate of reaction by influencing collision frequency, while a catalyst provides an alternative reaction pathway with lower activation energy.

Answer:b

Explanation:i just did it

What to do is On Form N-445, Notification of Naturalization Oath Ceremony, complete the questionnaire.Visit USCIS before your naturalisation ceremony and report there.Your Legal Resident Card must be returned (Green Card).To become an American citizen, you must take a Oath of Allegiance.

In a Nutshell:Application for Naturalization Form N-400 takes between 8 and 12 months to complete.On the USCIS website, keep records of your naturalisation application, and remain in touch wit your immigration attorney if you need any guidance.

$1,170.You have three options for paying the fee: cashier's check, personal check, or money order.You can pay with a credit card while submitting paperwork at the a USCIS lockbox by utilising Form G-1450, Permission for Card Transactions.

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Answer:

propane

Explanation:

Answer:

Its C

Explanation:

Answer:

1) A. carbon B. oxygen

2) A. semi metal. B. Non- metal( gas)

This element is in group 1.

According to the octet rule, this element would be expected to form an ion with a charge of +1.

If X is in period 5, the ion formed has the same electron configuration as the noble gas Krypton

The symbol for the ion is Rb⁺

Electronic configuration refers to the arrangement of electrons in the orbitals of an atom or molecule, indicating the energy level of the electrons, the number of electrons in each energy level, and the number of electrons in each orbital.

Considering the given element:

It has one valence electron, hence it is in group 1. Group 1 elements form ions with a charge of +1.

Losing one electron will give the ion the same electron configuration as Kyrton since it is the noble gas in Period 4.

The element is rubidium and the ion is Rb⁺.

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In first reaction alkyne is treated with base to remove proton later alkyne anion react with T20 to form tritium isotope labelled product.

What is reagent?

Reagent is a substance used to bring about a chemical reaction, or added to test if a reaction occurs. In a chemical reaction, one or more reactants are combined to form one or more products. A reagent is typically used to start, speed up, or determine the progress of a reaction. Common reagents include acids, bases, oxidizers, reducing agents, and salts. Reagents can also be used in qualitative or quantitative analysis to detect, measure, or separate chemicals in a sample.

For structure refer attached file
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After being treated with a base in the initial reaction to remove the proton, the alkyne anion then reacts with T20 to produce a product labeled with the tritium isotope.

A reagent in a chemical process is what?

In the field of chemical research, a "substance or compound that is given to a system in order to bring about a chemical reaction or is added to check whether a reaction is occurring or not" is referred to as a reagent. A similar response is utilized to validate the discovery of the presence of another drug.

A catalyst can speed up a certain chemical reaction, whereas a reagent is a material or mixture used in chemical analysis or other reactions.

See attached file for response.

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Answer:

Explanation:

I hope this helps

The compound that is formed from the combination of NH₄⁺ and SO₃²⁻ is (NH₄)₂SO₃ and the compound that is formed from the combination calcium ion and phosphate ion is Ca₃(PO₄)₂.

Definition of Ionic bond

A bond that is formed by the complete transfer of some electrons from one atom to another is known as an ionic bond. The atom which loses one or more electrons becomes a cation—a positively charged ion. The atom which gains one or more electron becomes an anion—a negatively charged ion.

The term "ionic bonding" is given "when the ionic character is greater than the covalent character".

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By a redox reaction that involves the transfer of electrons, often through the dissolution of an ionic substance, electrochemical cells produce electricity from the flow of electrons.

In electrochemistry, redox or oxidation-reduction reactions, in which electrons travel from one element to another, can produce electricity. Redox processes involve the transfer of electrons from one substance to another.

Batteries use a very significant class of oxidation and reduction reactions to produce useable electrical energy. Using solutions of respective sulphates, copper and zinc metals can be combined to create a straightforward electrochemical cell.

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Answer:

958 g is the mass of LiOH that can react with all the CO₂

Explanation:

CO₂(g) + 2 LiOH(s) → Li₂CO₃(aq) + H₂O

We think in the reaction:

1 mol of carbon dioxide can react with 2 moles of lithium hydroxide.

First of all, we convert the mass of our reactant to mol:

880 g . 1mol /44g = 20 moles

As ratio is 1:2, 20 moles of CO₂ will react with 40 moles of LiOH.

Let's determine the mass:

40 mol .  23.95 g /1mol = 958 g

Answer:

Explanation:

Why +4?

We can see here that the best fuel is the one that produces the most heat per unit mass. In this case, the fuel that produces the most heat per unit mass is methanol.

Fuel is a substance that is used to produce energy through combustion or other chemical reactions. It is commonly utilized to power various forms of transportation, generate heat or electricity, and operate machinery and appliances.

The results of the experiment are shown below:

Fuel            Mass (g)      Heat produced (J)       Heat per gram (J/g)

Methanol 1.0                          350                   350

Ethanol         1.0                          250                   250

Propane         1.0                          200                   200

Butane         1.0                          150                            150

Pentane         1.0                          100                            100

It is important to note that the results of this experiment are only a measure of the heat produced by the fuels.

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