100 ml of 4.0 c liquid water is heater until its temp is 37. calculate the amount of heat energy needed to cause this rise in temperature

Answer:

A

Explanation:

The octet rule refers to the tendency of atoms to prefer to have eight electrons in the valence shell. When atoms have fewer than eight electrons, they tend to react and form more stable compounds. When discussing the octet rule, we do not consider d or f electrons. Only the s and p electrons are involved in the octet rule, making it useful for the main group elements (elements not in the transition metal or inner-transition metal blocks); an octet in these atoms corresponds to an electron configurations ending with  s2p6 .

Answer:

it's A

The octet rule is a chemical rule of thumb that reflects the theory that main group elements tend to bond in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas. 

The octet rule states that atoms tend to form compounds in ways that give them eight valence electrons and thus the electron configuration of a noble gas. An exception to an octet of electrons is in the case of the first noble gas, helium, which only has two valence electrons.

Explanation:

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By mixing the chemicals.

Answer:

A chemical reaction can be sped up by many factors. Add a catalyst (A substance that reduces activation energy, speeding up the reaction) Increase the concentration of reactants. Increase the concentration of catalysts.

Answer:

47

Ag

Silver

107.87

Explanation:

Answer:

Yes

Explanation:

17×10−21 J/molecule.

The modern periodic law states that the physical and chemical properties of the elements are periodic functions of their atomic numbers. The elements are arranged in the increasing order of their atomic numbers.

Here the element Lithium is a alkali metal which is located in the group 1 of the periodic table and placed in the second period. Its atomic number is 3. Alkali metals are highly electropositive and are good reducing agents.

Lithium reacts with the elements of groups 16 and 17 and form compounds, they also burn in oxygen and react with water.

The reaction of lithium with water is:

2Li + 2H₂O → 2LiOH + H₂

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a 0.50 liter solution of 0.10 M HF titrated to the equivalence point with a 0.10 M solution of NaOH. The final volume of the solution is 1.0 liter. The pH of the equivalence point is 5.87.

The titration of hydrofluoric acid (HF) with sodium hydroxide (NaOH) can be represented by the balanced chemical equation:

HF (aq) + NaOH (aq) → NaF (aq) + H₂O (l)

At the equivalence point of the titration, the moles of NaOH added will be equal to the moles of HF originally present in the solution. We can use the balanced chemical equation to determine the number of moles of HF in the original solution:

0.10 M HF = 0.10 mol HF / L

0.50 L HF solution contains 0.05 mol HF

Therefore, when 0.05 mol NaOH is added at the equivalence point, it will react with all the HF present in the solution to form NaF and water.

The balanced chemical equation shows that one mole of HF produces one mole of H+ ions in solution. At the equivalence point, all the HF has been neutralized, and the remaining solution contains only NaF and water. NaF is the salt of a weak acid (HF) and a strong base (NaOH), and it undergoes hydrolysis in water, which means it reacts with water to produce H+ ions and F- ions:

NaF (aq) + H₂O (l) → HF (aq) + Na+ (aq) + OH- (aq)

The Kc expression for the hydrolysis of NaF is:

Kc = [HF][Na⁺][OH⁻] / [NaF]

At the equivalence point, all the HF has been converted to NaF, so [HF] = 0 M. The initial concentration of NaF is:

0.10 M NaOH = 0.10 mol NaOH / L

0.05 L added to the HF solution

0.005 mol NaOH added

0.005 mol NaF formed

0.005 M NaF

The reaction between NaF and water produces equal amounts of H⁺ and OH⁻ ions, so [H⁺] = [OH⁻] = x M (assuming the solution is initially neutral). The concentration of Na⁺ ions is equal to the initial concentration of NaF, which is 0.005 M. Substituting these values into the Kc expression, we get:

Kc = x² * 0.005 / 0.005

Kc = x²

Taking the square root of both sides, we get:

x = sqrt(Kc)

x = sqrt(1.8 × 10⁻¹¹)

x = 1.34 × 10⁻⁶ M

At the equivalence point, the pH of the solution is given by:

pH = -log[H⁺]

pH = -log(1.34 × 10⁻⁶)

pH = 5.87

Therefore, the pH of the solution at the equivalence point is 5.87.

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Answer:

the mass percentage of water of crystallization in washing soda is 62.9 %.

Explanation:

The question presents a table with many multiplications using different units (mass and velocity) and requires us to decide whether the operations presented are possible.

To solve this question, we should keep in mind this general rule: for units reffering to the same measurement (for example: mass, volume, distance etc.), we are able to multiply the units as long as they are the same. For example: g x g, L x L, m x m. If units are about the same measurement but still different, we should convert one of them in order to make them the same.

On the other hand, when we are talking about division, if we have the same unit on the operator and denominator position, we will have a result as "1" - then we need to analyze the entire value.

Now, considering the operations presented in the question:

On the first one, we have kg multiplied by kg. Although it isn't usual to see square kg (kg^2), we are able to make this operation:

On the second line, we have square g multiplied by kg. In this case, since the first unit is square, we can assume they are not about the same measurement. Thus, we can't complete this operation.

On the third line, there is a division and we should proceed as a normal operation (although the unit km/s isn't usual):

In summary, the answers should be:

1) Is it possible? YES / Result = 45 kg^2

2) Is it possible? NO

3) Is it possible? YES / Result = 0.8 km/s

Answer: 204 L

Explanation:

According to ideal gas equation:

\(PV=nRT\)

P = pressure of gas = 0.262 atm

V = Volume of gas = ?

n = number of moles = \(\frac{\text {given mass}}{\text {molar mass}}=\frac{11.7g}{4g/mol}=2.92\)

R = gas constant =\(0.0821Latm/Kmol\)

T =temperature =\(-50^0C=(273+(-50))K=223K\)

\(V=\frac{nRT}{P}\)

\(V=\frac{2.92\times 0.0820 L atm/K mol\times 223K}{0.262atm}=204L\)

Thus volume occupied by 11.7 g of Helium in a balloon is 204L

1) He is performing serology

2) Cast-off pattern

3) If the mother is Rh negative and her child is Rh positive she will form antibodies that may kill her second child

Serology is the scientific study of blood serum and other bodily fluids to detect the presence of specific antibodies or antigens.

This is usually done through a laboratory test called a serological assay, which is used to diagnose various infectious diseases, autoimmune disorders, and other medical conditions.

Serological tests work by detecting the presence of antibodies in a patient's blood serum or other bodily fluids.

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Answer:

For things that we can not directly observe, we can use indirect observation – which studies the consequences of an action or process. For example, we cannot see the Earth's magnetic field, but we detect it by its effect on a compass.

True. Do not use oil-based products such as Vaseline and body lotions because they destroy latex. Latex is a natural rubber, and when it comes into contact with oil-based products, it reacts chemically.

This reaction causes latex to degrade and lose its elasticity, making it prone to breakage. Therefore, it is important to avoid oil-based products when using latex products, such as condoms, gloves, and other medical supplies. Instead, use water-based products that are safe to use with latex. Water-based products are gentle on the skin and do not react chemically with latex, making them ideal for use with latex products.

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The atomic radius and metallic properties of sodium and phosphorus are different. It's important to know that sodium is a metal and phosphorus is a nonmetal, which is the reason for their distinct properties.

Sodium is a metal with an atomic number of 11, which means it has 11 protons and electrons. Phosphorus, on the other hand, is a nonmetal with an atomic number of 15, indicating that it has 15 protons and electrons. Atomic radius comparison:When moving from left to right across the periodic table, the atomic radius of elements tends to decrease. Sodium, for example, has an atomic radius of 186 pm, whereas phosphorus has an atomic radius of 98 pm.

As a result, sodium has a larger atomic radius than phosphorus, implying that sodium atoms are larger than phosphorus atoms. Metallic properties comparison: Metallic properties are more common in metals than in nonmetals. As a result, sodium, which is a metal, has more metallic properties than phosphorus, which is a nonmetal.

Sodium has one valence electron that can be easily removed from its outermost shell. Phosphorus, on the other hand, has five valence electrons, which means it will gain electrons to fill its outermost shell. Sodium has a lower electronegativity than phosphorus, indicating that sodium is more metallic than phosphorus.

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If 0.576 M of KF has a volume of 121.2 mL, the mass of KF is in the solution is 4.049 g

To determine the mass of KF in the solution, we can use the formula:

mass = molarity x volume x molar mass

First, we need to calculate the molar mass of KF:

KF

= K + F

= 39.10 g/mol + 18.99 g/mol

= 58.09 g/mol

Now, we can substitute the values in the given formula:

mass

= 0.576 mol/L x 121.2 mL x 58.09 g/mol

= 0.576 mol/L x 0.121 L x 58.09 g/mol

=4.049 g

Therefore, there are 4.049 g of KF in the solution.

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Gases near together and vibrate in position however, don't circulate beyond each other. In a liquid, the particles are interested in every different but now not as a great deal as they may be in a strong.

The particles of a liquid are near together, constantly transferring, and may slide beyond one another. The Kinetic-molecular concept attempts to explain the behavior of fuel molecules based totally on the nature of gasoline. The principle is grounded on  simple assumptions

In gases the debris passes swiftly in all directions, regularly colliding with every different facet of the box. With a boom in temperature, the debris gains kinetic strength and passes more quickly. Gasoline is a state of matter that has no constant form and no fixed extent. Gases have a decreased density than other states of the count, together with solids and liquids. there may be a high-quality deal of empty area between debris, that have loads of kinetic energy and aren't especially drawn to one another.

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The Entropy(ΔS) (water) is positive, and ΔS (surrounding) is negative, Water does evaporate, so the process is spontaneous, which means ΔS (universe) > 0 according to the Second Law of Thermodynamics.

What is Entropy (ΔS)?

The measure of a system's disorder is called entropy. It is a thermodynamic system's extensive attribute, which means that the amount of matter in the system affects how much it is worth. Entropy is typically represented in equations by the letter S and has units of joules per kelvin (J/K1) or (kg/m2/s2K1). Low entropy describes a highly ordered system.

What is the Second law of thermodynamics?

The entropy will either rise or stay the same in every cyclic process, according to the Second Law of Thermodynamics. Entropy, sometimes known as the "direction of time's arrow," provides information on how an isolated system evolves through time. If two separate pictures of the same system show one state that is more disordered than the other, it may be assumed that this state emerged later in time. In the case of an isolated system, the flow of events leads to a state where the system is more disordered or has the higher entropy.

Hence, ΔS (water) is positive, and ΔS (surrounding) is negative, Water does evaporate, so the process is spontaneous, which means ΔS (universe) > 0 according to the Second Law of Thermodynamics.

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Answer:

Explanation:

b

Answer:

Bari oxit được tạo nên từ các nguyên tố Bari (Ba) và Oxi (O)

Explanation:

The relationship between the average mass of one mole of carbon and the average mass of a single carbon atom measured in amu is based on the definition of molar mass and the atomic mass unit.

The average mass of one mole of carbon is equal to the average mass of a single carbon atom measured in atomic mass units (amu) due to the concept of molar mass. Molar mass is defined as the mass of one mole of a substance, and it is expressed in grams per mole (g/mol). The molar mass of an element is numerically equal to the atomic mass of that element expressed in atomic mass units. The atomic mass unit (amu) is a unit of measurement commonly used to express the masses of atoms and molecules. It is defined as one-twelfth the mass of a carbon-12 atom, which is assigned a mass of exactly 12 amu. The atomic mass of carbon is approximately 12.01 amu.

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The nurse would want to call a rapid response, place the patient on oxygen, and prepare for the administration of Epinephrine. This drug is the first-line treatment for anaphylactic shock, and It will increase blood pressure, decrease swelling, and dilate the airway.

“Nursing is not an easy job. It takes physical and mental stamina to survive a 14-hour shift.” If you believe, you may find yourself thriving. in the midst of activity.

There is much to learn. The exams are difficult, the schedules are complex, and the challenges pile up. All these factors can make life as a student difficult. Nursing is a highly competitive field from the moment you start the application process until you graduate.

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Answer:

Seafloor spreading

Explanation:

The possible compositions of the liquid phases are: \(x_{1} =0.15\) and  \(x_{2} =0.79\), while those of vapor phases are: \(y_{1} =0.2\) and  \(y_{2} =0.7\)

The given binary mixture of ethanol and ethyl acetate at 100 kPa.

Given plot is temperature versus mole fraction (T-xy) at constant pressure 100 kPa.

In the given plot, the upper curve represents the dewpoint curve and lower curve represents bubble point curve.

At a given temperature 74 C, we can determine the mole fractions as follows:

1. We draw a horizontal lie from 74 °C mole fraction 0 to 1 and it touches lower curve at two points and upper curve at two points.

2. We also draw a vertical line from points where it touches the lower curve gives the composition of liquid and draw a vertical line from points where it touches the upper curve gives the vapor compositions.

From the plot given below, the compositions of liquid where the vertical line touches lower curve are: \(x_{1} =0.15\) and \(x_{2} =0.79\)

And those for vapor phases where the line touches the upper curve are:

\(y_{1} =0.2\) and \(y_{2} =0.7\)

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Answer:

It must be a part of a eukaryote

Explanation:

Eukaryotic cells are larger than prokaryotic cells and have a “true” nucleus, membrane-bound organelles, and rod-shaped chromosomes. The nucleus houses the cell's DNA and directs the synthesis of proteins and ribosomes.

Answer:

Another word which can be used to replace gas is air.

Air is a gas simply because it is a mixture of a number of gases. In order words, air consists of different gases including hydrogen gas, oxygen gas, carbon dioxide gas, rare or noble gases, dust, moisture, nitrogen gas and so on and so forth. Because air is an embodiment of different gases, it is on this premise that the word " air " can be used instead of gas.

However, there are so many other words which can be used as synonyms for gas or to replace gas; among which include: fart, vapor or even steam.

So therefore, we can now confirm from the detailed explanation above that when we talk about gas, we are referring to air as well.

Complete question:

What is another word for gas?

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Answer:

The density of helgas sample is 17.8 g/cm³.

Explanation:

Given that,

Mass of sample of Rowena = 5 gram

Density = 8.9 g/cm³

Mass of sample of helga = 10 gram

We need to calculate the volume of sample

Using formula of volume

\(V=\dfrac{m}{\rho}\)

Where, m = mass

\(\rho\) = density

Put the value into the formula

\(V=\dfrac{5}{8.9}\)

\(V=0.56\ cm^3\)

We need to calculate the density of helgas sample

Using formula of density

\(\rho=\dfrac{m}{V}\)

Where, m = mass

V = volume

Put the value into the formula

\(\rho=\dfrac{10}{0.56}\)

\(\rho=17.8\ g/cm^3\)

Hence, The density of helgas sample is 17.8 g/cm³.

The diagram shows a chromatogram of several inks, which means the statement that is correct is Yellow may be present in green ink and is denoted as option A.

This refers to a laboratory technique which involves the separation of a mixture into its various components and it comprises of two types of phases which can be seen below:

The mobile phase refers to the fluid solvent which is added to the mixture and moves according to their solubility differences while the stationary phase is the material in which they move on.

In the chromatogram given, we can see that yellow and green have the same solubility which means that yellow may be present in green ink.

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Answer:

4is the answer

Explanation:

The type of object that completely absorbs white light would be a black piece of paper. First option.

Black bodies are objects that completely absorb all the components of white light.

White light is a mixture of different colors of light, each with a different wavelength and frequency.

When white light strikes a black body, the black body absorbs a large fraction of all the different colors, regardless of their wavelength. This absorption causes the light to be transformed into thermal energy, which increases the temperature of the black body.

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