The volume of Oxygen gas at 250 °K is 4.00 L. At a constant pressure , what is the volume at 50 °K ? (Charles Law )

Answer:

V = 11 L

Explanation:

To find the missing value, you need to use the Ideal Gas Law. The equation looks like this:

PV = nRT

In this formula,

 ----> P = pressure (atm)

 ----> V = volume (L)

 ----> n = number of moles

 ----> R = constant (0.0821 atm*L/mol*K)

 ----> T = temperature (K)

You have been given all of the values in the correct units. Therefore, you can plug these values into the equation and simplify to find volume. The answer should have 2 sig figs to match the given value with the lowest amount of sig figs.

PV = nRT

(9.4 atm)V = (4.5 moles)(0.0821 atm*L/mol*K)(286 K)

(9.4 atm)V = 105.6627

V = 11 L

Depending on the reaction conditions, the reaction between selenium (Se) and sodium (Na) can result in a variety of compounds. However, sodium selenide is a frequently formed product (Na2Se).

Under the right circumstances, sodium (Na) and selenium (Se) can react to generate a variety of products, including sodium selenide (Na2Se) and/or other intermediary compounds. The creation of ionic compounds with various stoichiometries is often the outcome of an electron transfer process between the reactants. Temperature, pressure, concentration, and the presence of catalysts are a few examples of the variables that may have an impact on the reaction rate and product distribution. With a high melting point and black hue, sodium selenide is a solid that is frequently utilised in the production of other selenium compounds. Overall, the reaction of selenium with sodium is a significant procedure for producing compounds containing selenium that have a variety of uses in chemistry, materials science, and industry.

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Li and Na two elements have chemical properties that are most similar

The element that have the most similar chemical properties are those in the same group or column of the periodic table and one such group includes lithium sodium potassium these element are all shiny and conduct heat and electricity well and have similar chemical properties and the element in a group have the same number of electron in the outermost shell hence they have similar chemical properties

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When HCl is added to aqueous solution of sodium sulphate aqueous solution, sulfuric acid is formed, and the solution's chemical makeup and acidity get changed.

Thus, several chemical reactions happen when HCl is introduced to a sodium sulphate aqueous solution. While sodium sulphate breaks down into 2 Na+ ions and SO4^2- ions, HCl splits into H+ and Cl- ions. When the H+ ions from HCl interact with the SO4^2- ions, sulfuric acid, a more potent acid, is created.

The solution's H+ ion concentration rises as a result of this reaction, altering the equilibrium in favor of the products. As a result, the system's equilibrium is upset, which causes sulfuric acid to form. The solution's chemical makeup and acidity ultimately alter as a result of the addition of HCl.

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The molar mass of NaCl is 58.44 g/mol (22.99 g/mol for Na and 35.45 g/mol for Cl).

The correct option is C

To find the percent composition of NaCl in the water, we can use the following formula:

percentage % composition of NaCl = (mass of NaCl / mass of seawater) x 100%

We can first calculate the mass of NaCl in the sample:

0.317 moles NaCl x 58.44 g/mol = 18.5 g NaCl

Therefore, the percent composition of NaCl in the seawater is:

(18.5 g / 520 g) x 100% = 3.6%

Therefore, the correct answer is (c) 3.6%.

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If the MDS (Minimum Data Set) is successfully implemented, several positive outcomes can be expected. The MDS is a standardized assessment tool used in healthcare settings to evaluate the physical, mental, and psychosocial well-being of patients.

Its successful implementation can lead to improved patient care, more efficient resource allocation, and enhanced data analysis.With the MDS in place, healthcare providers can gather consistent and comprehensive data about patients, enabling better understanding of their needs and tailoring of individualized care plans.

This can result in improved treatment outcomes and patient satisfaction. Additionally, the MDS facilitates effective communication and information sharing among healthcare professionals, leading to coordinated care and reduced errors.From a broader perspective, successful implementation of the MDS allows for accurate and reliable data collection, enabling robust research and evidence-based decision-making.

This can contribute to advancements in healthcare practices, policy development, and quality improvement initiatives. Ultimately, the successful implementation of the MDS can enhance patient outcomes, improve healthcare delivery, and drive positive changes in the healthcare system as a whole.

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Explanation:

CH4+8/2Cl2—>CCl4+4HCl

that is,1molecule of methane+8/2 molecules of dichlorine—>1molecule of carbon tetrachloride+4molecules of hydrogen chloride

Answer:

0.5 grams

Explanation:

Answer:

d

Explanation:

d

The formulas which could represent the empirical formula and the molecular formula of a given compound are  CH₂, C₃H₆ as the smallest possible is 2 which on multiplying the subscripts of empirical formula give molecular formula.

Empirical formula of a compound is defined as the simplest whole number ratio of atoms which are present in a compound.It does not make any mention of the arrangement of atoms or the number of atoms. The empirical formula gives information about the ratio of number of atoms which are present in a compound.

Molecular formula is determined from the empirical formula by dividing the molar mass of a compound by the empirical formula mass. The resultant which should be a whole number or very close to the whole number , then the subscripts are multiplied by the whole number to get the molecular formula.

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Answer:

\(\fbox{c = - 4.01 \: joule/g°C}\)

Step by step explanation:

Given:

Mass of given sample (m) = 2.50 g

Initial temperature (T1) = 25°C

Final temperature (T2) = 20°C

Heat Energy Q = 12 cal

To find:

\(Specific \: Heat \: c = \: ?\)

Solution:

We know that,

Specific heat of any substance is directly proportional to the mass and change in temperature.

Represented by equation,

\(Q = mc \triangle T\)

Where,

Q = Heat Energy

m = mass of given sample

c = specific heat

∆T = change in temperature

Substituting corresponding values,

\(Q = mc \triangle T \\ 12 = 2.5\times c \times (20-25) \\ c = \frac{12}{2.5 \times ( - 5)} \\ c = - 0.96 \: cal/g°C \\ \)

We also know that,

\(1 \: cal = 4.184 \: joules\)

multiplying above answer by 4.184,

\(c = - 0.96 \times 4.184 \\ \fbox{c = - 4.01 \: joule/g°C}\)

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Answer: A physical property that will be the same regardless of the amount of matter. Extensive Properties:  A physical property that will change if the amount of matter changes.

Answer: H2O

Explanation:To determine the most polar molecules one could look at the electronegativities between the molecules involved. The greatest difference in electronegativity will correspond to the most electronegative compound.

Answer:

I have attached pictures below. Maybe those will help?

Explanation:

Answer:

this is  a CER model i did for science

Explanation:

claim : Tissue engineering is good for the future and has a positive impact on the future because tissue engineering restores aged, damaged or lost tissues/organs with artificial tissues in a way past medicines or technology has not.

evidence: The infographic states, “This science field provides opportunities for helping many people replace dead or injured organs with new ones. In doing so, it will give them a healthier, more productive life. This field is just beginning, and it is sure to change the length and quality of life of many people in the future.“

reasoning: Many people can benefit from tissue engineering because they can have dead or injured organs replaced with new ones. Tissue engineering is just the beginning and is still being conducted and tested , but as technology gets more advanced and advanced, tissue engineering will improve peoples lives the way medicines and past technology has never done.

Answer:

C. The more electronegative atom willl make its end of the

bond more negative

A P E X

The electronegativity affects the polarity of the bond between two atoms, as the more electronegative atom will make its end of the bond more negative. The correct option is C.

Electronegativity is a charge that shows the ability of an element to gain electron pairs with other elements during bonding. Electronegativity is altered by the distance between the electron and the nuclei and the atomic number of the element.

Polarity is the state of the atomic body in which it has placed charges in an opposite way to the other atoms so that they can join together.

Thus, the correct option is C. The more electronegative atom will make its end of the bond more negative.

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Answer:

Ionic bond.

Explanation:

Group 7 elements like Bromine (Br) and group 2 elements like Magnesium,(Mg) involved loss and gain of electrons which is typical with Ionic bonding.

Answer:

\(\triangle G = -911.296 \ kJ\)

Explanation:

ΔG = ΔH-TΔS

Where ΔH = -176 kJ = -176000 J , T = 25°C + 273 = 298 K , ΔS = -284.8 JK⁻¹

=> \(\triangle G =-176000 - (298)(-284.8)\)

=> \(\triangle G = -176000+84870.4\)

=> \(\triangle G = -91129.6 \ J\)

=> \(\triangle G = -911.296\ kJ\)

Since the value is negative, the reaction is spontaneous under standard conditions at 298 K and the reactants have more free energy than the products.

Answer:

655

Explanation:

using bodmas, (bracket first), 8.81-7.50=1.31

1.31÷0.0020=655

The temperature of the substance from point D to point E remains constant at 0°C, indicating a phase change from a solid to a liquid state.

During this time period, the substance is melting, and the energy added to the substance is being used to break the intermolecular forces between the molecules of the solid, allowing them to move more freely and become a liquid. This phase change is known as melting or fusion, and it occurs at a constant temperature, as long as the pressure remains constant.

A substance is in the solid phase between points A and D on the graph. At point A, the temperature is -20°C, and the substance is a solid. As energy is added to the substance, the temperature increases until it reaches the melting point at point D. At this point, the substance begins to melt and becomes a liquid. Therefore, between points A and D, the substance is in the solid phase, as it has a fixed shape and volume.

The phase change that requires the greatest change in energy is the change from a solid to a gas, which is represented by the vertical line between points B and C on the graph. This phase change is known as sublimation and requires a significant amount of energy because it involves the breaking of strong intermolecular forces between the molecules in the solid, followed by the creation of new intermolecular forces between the gas molecules.

During sublimation, the substance changes from a solid to a gas without passing through the liquid phase. The energy required for sublimation is significantly higher than that required for melting or boiling because it involves breaking strong intermolecular forces in the solid state and overcoming the forces of attraction between the gas molecules.

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Answer:

a liquid

Explanation:

while zinc is an important mineral with numerous functions in the body, it is not true that grains are the most reliable food source of zinc. A balanced diet that includes a variety of foods can provide adequate zinc intake for most people.

How to solve the problem?

The statement that is NOT true of zinc is "Grains are the most reliable food sources of zinc." While grains can be a source of zinc, they are not necessarily the most reliable source.

Zinc is an essential mineral that plays important roles in many biological processes, including immune function, protein synthesis, wound healing, and DNA synthesis. It is involved in various enzymatic reactions, and acts as a cofactor for many enzymes. Zinc is also important for proper growth and development, especially during childhood and adolescence.

Excess zinc intake can lead to decreased copper absorption, as both minerals compete for absorption in the intestines. This can lead to copper deficiency, which can cause anemia neutropenia, and other health problems. Therefore, it is important to maintain a balance between zinc and copper intake.

While grains can be a source of zinc, other foods such as meat, seafood, and dairy products are also good sources. Vegetarians and vegans may need to pay particular attention to their zinc intake, as plant-based sources of zinc may be less bioavailable than -based sources. Zinc supplements can also be used to prevent or treat deficiencies, but should be used with caution as excessive intake can have negative health effects.

In summary, while zinc is an important mineral with numerous functions in the body, it is not true that grains are the most reliable food source of zinc. A balanced diet that includes a variety of foods can provide adequate zinc intake for most people.

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Answer:

It has its elements with mass numbers phrased in many decimal places, it requires one to round off to get the actual value.

The atomic numbers of some elements such as Protonium were just guessed.

25 M of a solution of 5 moles of NaCl dissolved in 0.5 liters of water.In chemistry, the most commonly used unit for the term molarity is the number of moles per litre.

Molarity = Weight/GMW  × 1000/V
             = 5/40 * 1000 / 500

             = 25 M

The term "molarity" or "molar concentration" refers to the quantity of solute molecules per litre of solution, and it can be calculated using the following equation: Utilise molar concentration to translate between the mass or moles of the solute and the volume of the solution.

A solution with a concentration of 1 mol/L is said to be 1 molar. It is commonly designated as 1 M. In simple language, the molarity of a given solution is the total number of moles
of solute per litre of solution.

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Answer:

the volume of a object will go down but the density stays the same

The type of reaction that will occur if AH is negative and entropy increases is option  A which is a spontaneous reaction .

The spontaneity of any chemical reaction depends on the Gibbs free reaction which is related to entropy change and enthalpy change.ΔG= ΔH-TΔS

Where T is temperature change in kelvin.If AH is negative, entropy will increases which is ΔS. Then the ΔG will depend on the temperature change.

If TΔS is larger than ΔH, the reaction will be spontaneous and ΔG will be negative which means the reaction will move forward without any external input.

When a change in entropy increases with the temperature in the system, the reaction will be spontaneous and this will make the Gibbs free energy to be negative.

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Answer:

All of the above are correct.

Explanation:

The Flame Test Shortcomings

Small quantities of most molecules can not be measured by the examination.

The signal's intensity ranges from one test to the next.

The test findings are impaired by impurities or toxins.

The test is not capable of differentiating between all components.

Answer:

69.23g

Explanation:

Find out how many moles is in 9.89g of H2.

number of moles = mass(g) / molar mass

1 is the molar mass of hydrogen (to the nearest whole)

relative molecular mass of H2: 2*1 = 2

number of moles of H2 = 9.89/2 = 4.945

1 mol of H2 is produced from 2 mol of Li

so

4.945 mol of H2 produces 9.89 mol of Li

mass(g) = number of moles * molar mass

7 is the molar mass of Lithium (to the nearest whole)

mass = 9.89 * 7 = 69.23

69.23 grams of Li are needed to produce 9.89 of H2

Answer:

See explanation

Explanation:

The degree of movement of molecules in each not the three different states of matter depends on the arrangement of the molecules.

In a solid, molecules are packed closely together and are held in fixed positions by strong intermolecular forces such that they can only vibrate or rotate about a fixed point.

In liquids, molecules are less closely packed hence they can flow around each other but possess only little kinetic energy. Intermolecular forces in liquids are much lesser than that of solids.

In gases, intermolecular forces are negligible and gas molecules move with a very high velocity and possess high kinetic energy. There are large spaces between gas molecules and they are always in motion.

Answer:

water

Explanation:

In chemistry, an important principle that guides the solubility of a solute in a solvent is the principle of like dissolves like.

A polar solvent will dissolve a polar solute and a non-polar solvent will dissolve a non polar solute.

Ethyl acetate is a polar solute. It will have to dissolve in water which is a polar solvent. Hence, ethyl acetate will dissolve in the water layer.

Answer:

it's zero

Explanation:

water is composed of hydrogen and oxygen