Potassium reacts with fluorine to produce the ionic compound potassium fluoride

Figure 3 shows the transfer of electrons during the reaction.

(d)

o-loilor
Describe what happens when potassium reacts with fluorine to produce potassium
fluoride. Write about electron transfer in your answer.
(5)

Strong and Weak Foundations Bases provide a similar problem: a strong base is one that is completely ionized in solution.

Strong and Weak Foundations Bases provide a similar problem: a strong base is one that is completely ionized in solution. A weak base is one that is less than 100% ionized in solution.

Acids and bases are incompatible. Acids and bases will balance one another out. A solution's pH can be changed by acids but not by bases. While bases give hydrogen ions (H+), acids give hydroxide ions (OH-).

The aqueous solution of the salt formed by neutralisation of weak acid and strong base possesses basic nature, while aqueous solution of salt produced by neutralisation of weak base and strong acid possesses acidic nature.

The complete question is:

A strong base or salt in solution exist predominately as electrons in solution.

a) True

b) False

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Answer:

that "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules." For a given mass of an ideal gas, the volume and amount (moles) of the gas are directly proportional if the temperature and pressure are constant.

Answer:

a neutron decays into a proton, an electron, and an antineutrino: n Æ p + e - +.

Explanation:

In beta plus decay, a proton decays into a neutron, a positron, and a neutrino: p Æ n + e+ +n. Both reactions occur because in different regions of the Chart of the Nuclides, one or the other will move the product closer to the region of stability. These particular reactions take place because conservation laws are obeyed. Electric charge conservation requires that if an electrically neutral neutron becomes a positively charged proton, an electrically negative particle (in this case, an electron) must also be produced. Similarly, conservation of lepton number requires that if a neutron (lepton number = 0) decays into a proton (lepton number = 0) and an electron (lepton number = 1), a particle with a lepton number of -1 (in this case an antineutrino) must also be produced. The leptons emitted in beta decay did not exist in the nucleus before the decay–they are created at the instant of the decay.

The subscripts in a chemical equation shows the number of atoms of each element in a compound.

A chemical equation is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.

Chemical equations involves molecular formulas of compounds that make up the reactant and products. The molecular formula is a notation indicating the number of atoms of each element present in a compound.

Subscript is a type of lettering form written lower than the things around it. The subscript shows the number of atoms of an element in a compound.

Examples of elements with evident subscripts are as follows:

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Sodium (Na) and potassium (K) in the same group on the periodic table because of option B They have similar reactivity.

The periodic table, also called the periodic table of the factors, is a tabular show of the chemical elements. it is broadly used in chemistry, physics, and other sciences, and is typically visible as an icon of chemistry.

Lithium, sodium, and potassium have the same wide variety of valence electrons i.e. 1, for this reason, they belong to the same organization. The institution is referred to as the alkali metals group because these kinds of elements shape oxides that dissolve in water to form alkali.

Potassium is observed clearly in lots of meals and as a complement. Its major position within the body is to assist maintain ordinary levels of fluid inside our cells. Sodium, its counterpart, keeps regular fluid ranges outdoors of cells. Potassium also helps muscles to settle and supports normal blood pressure.

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Answer: 3. The atoms are rearranged to form new substances.

According to law of conservation of matter, atoms are rearranged to form new substances in a chemical reaction.

According to law of conservation of matter, it is evident that matter can  be  neither created nor destroyed rather it is restored at the end of a chemical reaction .

Law of conservation of matter and energy are related as matter possesses mass and mass  and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of matter is widely used in field of chemistry and fluid dynamics.

Law needs to be modified in accordance with laws of quantum mechanics under the principle of matter and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.

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Answer: Option (B) is the correct answer.

Explanation: Freezing point depression is defined as the decrease in temperature of freezing of a solvent when a non-volatile solute is added into it.

This decrease in temperature arises because addition of solute particles into the solvent tend to disrupt the crystal formation of the solvents.

As a result, particles does not come closer to each other. Hence, we need to provide more lower temperature due to which there will be formation of crystal lattice in order to form the solid.

Thus, we can conclude that a solute depress the freezing point because the solute disrupts crystal formation by the solvent.

If the density of an object is greater than 1 g/mL, the object will sink in water (option D).

Density of a substance can be defined as the measure of the mass of matter in the substance contained by a unit volume.

The density of a substance is a determinant of whether or not the substance will float or sink in a liquid substance like water.

This means that an object will float in water if it has a density less than water but will sink if it has a density higher than water.

Since the density of water is 1g/mL, therefore, an object with density greater than 1g/mL will sink in water.

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These isolated thylakoids are transferred to a ph8 solution in the dark, that the isolated thylakoids produce ATP.

The chloroplasts are exposed to a hypotonic buffer devoid of sorbitol in order to achieve this. While stromal extract (SE) must also be isolated during this preparation if the cpSec1 or cpSRP pathways are to be studied, isolated thylakoids can be used to test any of the translocation pathways.

In the experiment that follows, it is possible to make thylakoid membranes that were isolated from chloroplasts produce ATP without the assistance of photosynthetic electron transport. Thylakoids are taken out of chloroplasts and suspended in a pH 4 buffer.

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As you climb to the top of a academic mountain in florida, air pressure decreases from 1 atm to0.75 atm at the peak. what will the partial pressure of oxygen be at the top of the mountain.

Pressure

Pressure( symbol p or P) is the force applied vertical to the face of an object per unit area over which that force is distributed.

Colorful units are used to express pressure. Some of these decide from a unit of force divided by a unit of area; the SI unit of pressure, the pascal( Pa), for illustration, is one newton per forecourt metre( N/ m2); also, the pound- force per forecourt inch( psi) is the traditional unit of pressure in the Homeric and U.S. customary systems. Pressure may also be expressed in terms of standard atmospheric pressure; the atmosphere( atm) is equal to this pressure, and the torr is defined as 1⁄760 of this. Manometric units similar as the centimeter of water, millimeter of mercury, and inch of mercury are used to express pressures in terms of the height of column of a particular fluid in a manometer.

Pressure is the quantum of force applied vertical to the face of an object per unit area. The symbol for it's" p" or P.( 2) The IUPAC recommendation for pressure is a lower- case p.( 3) still, upper- case P is extensively used. The operation of P vs p depends upon the field in which one is working, on the near presence of other symbols for amounts similar as power and instigation, and on writing style.

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However, if it is heated to impregnated vapor, volume and work (1W2) will determine the final temperature. result (a) Indicate that the lift pressure should be 400 kPa, using v = V/ m = 0.1 m3/kg

Standard sets of circumstances for experimental measures to be produced at standard temperatures and pressures (STP) enable comparisons to be made between various sets of data. The most commonly used standards are those of the National Institute of Standards and Technology (NIST) and the International Union of Pure and Applied Chemistry (IUPAC), albeit these standards are not generally acknowledged. Different essential delineations for other associations' standard reference circumstances have been established.

In chemistry, IUPAC changed its description of standard temperature and pressure in 1982

Temperature and Pressure

Until 1982, STP was defined as a temperature of273.15 K( 0 °C, 32 °F) and an absolute pressure of exactly 1 atm(101.325 kPa).

Since 1982, STP has been defined as a temperature of273.15 K( 0 °C, 32 °F) and an absolute pressure of exactly 105 Pa( 100 kPa, 1 bar).

STP shouldn't be confused with the standard state generally used in thermodynamic evaluations of the Gibbs energy of a response.

NIST uses a temperature of 20 °C(293.15 K, 68 °F) and an absolute pressure of 1 atm(14.696 psi,101.325 kPa). This standard is also called normal temperature and pressure( shortened as NTP). still, a common temperature and pressure in use by NIST for thermodynamic trials is298.15 K( 25 °C, 77 °F) and 1 bar(14.5038 psi, 100 kPa). NIST also uses" 15 °C( 60 °F)" for the temperature compensation of refined petroleum products, despite noting that these two values aren't exactly harmonious with each other.

The International Standard Metric Conditions for natural gas and analogous fluids are288.15 K(15.00 °C;59.0.

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The change will correctly effect the model of the electron transport system above simply is to switch H₂O and O₂ ( Water and oxygen ).

The correct answer choice is option c.

It happens that oxygen react with 2 different electrons from the transport chain and 2 hydrogen in order to produce water molecules in the process.

Electron transport chain simply refers to a protein complex redox reactions which result in the production of ATP molecules. In this whole process of forming ATP, the electrons in the chain carried by the NADH, FADH2 and H+· are transferred to oxygen atom.

In conclusion, for an effective change to occur in the above electron transport system, there needs to be a switch of water and oxygen molecules

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Answer :Switch H2O and O2.

Explanation: edgenuie 2022-23

Solid with the following characteristics property: Density is 0.56 g/cm³ is Lithium .

Lithium , chemical symbol Li is the alkali group metal. lithium is the lightest solid element. lithium has melting point of 180.54 °C and having boiling point of 1342 °C. lithium belongs to group I(a) having valency 1. under normal condition , lithium is the least dense solid element having density 0.56 g/cm³ . lithium has several industrial uses like heat resistant glass lithium ion batteries , lithium is so light ,it can float on water.

Thus, Solid with the following characteristics property: Density is 0.56 g/cm³ is Lithium .

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The student made a mistake in substituting the wrong values of the relative abundance of the isotopes Potassium-39 and Potassium-41. That is why his answer was wrong.

The student exchanged the values of the relative abundance of the isotope values. That is why it has resulted in the wrong value of the average atomic mass. On substituting the correct values using the following formula, we get the atomic mass of the respective isotopes as,

atomic mass = Mass x Relative abundance

atomic mass of K⁴¹₁₉ = 40.962 x 0.0688

the atomic mass of K⁴¹₁₉ = 2.8181856amu

Similarly, for the mass of K₃₉¹⁹ = 38.964 x 0.9312

                                                  = 36.28327amu

Thus the average atomic mass of Potassium is given by,

Average atomic mass of potassium = Mass of K₃₉¹⁹ + Mass of K⁴¹₁₉

The average atomic mass of potassium = 36.2832 +2.8181

The average atomic mass of potassium = 40.962amu

Hence, the correct value of the average atomic mass is thus obtained.

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If Andrea's teacher wrote a note on her lab report stating that though her data was precise, it was not accurate, then Andrea she didn't properly calibrate her instruments (Option b).

The term precision indicated that the measurement was correctly recorded in the experimental procedure, while accuracy refers to this measurement is factually correct. For example, when measuring temperature, it may be deviated from the correct temperature value due to failure of calibration in instrumentation.

Therefore, we can conclude that precision and accuracy are not identical and we can take precise measurements that are not accurate.

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The value of a car that was purchased in 2010 for $20,000 which is depreciating in value by 15% each year is $3937.49.

The value of the car will be found using the exponential decay model.

The formula of the exponential decay model is given as follows:

y = a (1 - r)ˣ

where;

y = the amount remaining

a = initial amount

r = decay rate

x = time period of decay

In the question above, a car was bought for $20000 in 2010.

The value of the car decays exponentially at a rate of 15% each year.

The time period between 2010 and 2020 is 10 years.

Considering the data given about the car:

a = $20000

r = 15% or 0.15

x = 10

Substituting the values in the decay formula:

y = 20000 (1 - 0.15)¹⁰

y = 20000 (0.85)¹⁰

y = $3937.49

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Answer:

Water Intake,Food Intake

Explanation:

Evidence might you need in order to explain the bands of different colors are because of electromagnetic radiations

The color of the light that correspond to the narrow wavelength band are the pure spectral colors

Here each different wavelength and frequency of visible light correspond to the different color so that spectrum appear as a band of color ranging from violet at the shorter wavelength and full spectrum of visible light travel through prism and wavelength separates into the colors of the rainbows because each colors has its own frequency and different wavelength and spectrophotometer is the important tool to study the colors of band

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Resistance is inversely proportional to current because R = VI. Option D.

If you increase the applied voltage and don't change the resistance, the current will also increase. The higher the resistance the more strongly the electron interacts with the resistance, slowing it down. Electrons repel each other, so even if more electrons pass through the resistor this cannot be counteracted.

As resistance increases current decreases and all other factors remain constant. Materials with low resistance, such as metals, are called electrical conductors and allow current to flow easily. High-resistance materials such as plastics are called electrical insulators. Current is inversely proportional to resistance. If I fix the voltage across a variable resistor the current that flows is inversely proportional to the resistance.

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Answer:

B) Resistance is inversely proportional to current because R = V/I

Explanation:

Proton has positive charge whereas neutron has no charge.

Proton is a type of subatomic particle that has a positive charge whereas Neutron is a type of subatomic particle that has no charge.

An atom that has lost one or more number of electrons is known as anion.

Isotopes is defined as an element that have the same number of protons i.e. atomic number but different numbers of neutrons i.e. mass number.

Electron is located outside the nucleus of an atom.

Fluorine is that atom which has 9 number of protons so its atomic number is 9.

Atomic number is related to the number of particles in the nucleus of an atom because in the nucleus, proton is present which shows the atomic number of an atom.

There are three parts of an atom i.e. proton, electron and neutron.

The size of electron is about 2 × 10⁻¹⁰ cm, The size of proton is about 0.84×10⁻¹³ cm and the size of neutron is about 1.7×10⁻¹⁵ meters

Electron has negative charge, proton has positive charge and neutron has no charge.

Yes, we can tell about the element if we know about the charge and the number of electrons in it because different atoms has particular number of electrons.

The diameter of a nucleus in scientific notation is 1.6 x 10⁻¹⁵.

The mass of hydrogen atom in whole number is 0.00000000000000000000000000167.

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1. Na cannot replace K

2. Co will replace Cu

3. Zn cannot replace itself

4. Ni  cannot replace Ba

The reactivity series is a table showing how reactive elements. The reactiveness could be in descending or ascending order.

Reactivity series exist for both cations and anions.

In this case, we are dealing with cations. The reactivity series for cations is in the attached image.

The following can be observed from the table:

As a rule of thumb, cations at the lower part of the table cannot displace cations at the upper part during reactions.

Thus:

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No because it's travelling at a constant velocity in both scenarios and there's no particular direction in which the rate of change of velocity is changing.

After ingesting 1 L of 80-proof whiskey, the student's consumption of ethanol would, after the application of dimensional analysis, be 5.798 g of ethanol per kilogram of the body.

First, we calculate the mass of ethanol ingested by the student by using dimensional analysis. To do that, we must calculate its volume, which we can do using the total volume (1 L = 1000 mL) and alcohol volume percentage (40% = 0.40). When we have the volume in hand, we can calculate the mass of ethanol using its density (0.789 g/cm³ = 0.789 g/mL).

m(EtOH) = V(EtOH) * d(EtOH) = 0.40 * V(total) * d(EtOH) = 0.40 * 1000 mL * 0.789 g/mL = 315.6 g

So the student would ingest 315.6 g of ethanol. We can now divide that mass by the student's mass to calculate their consumption.

1 lb = 453.59 g = 0.45359 kg

315.6 g / (120.0 * 0.45359 kg) = 5.798 g/kg

This is dangerously close to the median lethal dose and definitely above the lower threshold of 5 g/kg, so the student would definitely be in danger of overdosing.

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Answer:

Heat waves can form when a high-pressure system moves into a region and stalls. The system can force warm air downward, acting like a cap as it keeps the cool air near the surface from rising, according to AccuWeather. What qualifies as a heat wave can vary greatly from region to region.

Explanation:

mole=mass/molar mass

molar mass of c12H17N4OS

12×12+17+14×4+16+32

=265

molar mass=265

mole=0.02/265

Answer:

t can be removed by using a water softener

Explanation:

The balanced equation for ammonia formation is:

N2 + 3H2 ---> 2NH3

First we need to figure out how many moles of hydrogen, 340 grams nets us. We can do this by dividing 340 by the molar mass of diatomic hydrogen (2.016 grams/mole). This will get us 168.651 moles.

From the chemical formula, we see that it takes 3 moles of hydrogen to produce 2 moles of ammonia. So, if we multiply the moles of hydrogen by (2/3), we can find the moles of ammonia produced.

168.651 x (2/3) = 112.43 moles of ammonia

To convert this into grams, we multiply this number with the molar mass of ammonia (which is 17.031 grams/mole)

112.43 x 17.031 = 1914.8 grams of ammonia. Or if you want to account for significant figures, 1900 grams of ammonia.