A hiker inhales 598 ml of air. if the final volume of air in the lungs is 612 ml, at a body temperature of 37 degrees celsius, what was the initial temperature of the air in degrees celsius? explain.

Answer:

a metal is an element that readily forms positive ions (cations) and has metallic bonds

coke is a strong stimulant made from coca leaves

Answer:

Bài 1. Có 30g dung dịch NaCl 20%. Tính nồng độ % dung dịch thu được khi

a. Pha thêm 20g H2O

b. Cô đặc dung dịch để chỉ còn 25g.

The safety of the spring water sample is said to be  that in an untreated state, it is said to be undrinkable.

The EPA is one that tells that the spring water is seen as a kind of any water that is said to have its origin from any  kind of underground aquifer and is said to be taken as it flows naturally to the earth's surface or through the use of a borehole that lunch into the underground  water  source.

Note that studies shows that when a spring water is said to be examined, the different parameters of health safety were said to be analyzed by the use of laboratory tests and the outcome of the  study reveals that water is not good  for drinking because it has higher concentrations of ammonium ion as well as others.

Hence, The safety of the spring water sample is said to be  that in an untreated state, it is said to be undrinkable.

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It means that a person has the ability to describe, explain, and predict natural phenomena. Scientific literacy entails being able to read with understanding articles about science in the popular press and to engage in social conversation about the validity of the conclusions. Scientific literacy implies that a person can identify scientific issues underlying national and local decisions and express positions that are scientifically and technologically informed. A literate citizen should be able to evaluate the quality of scientific information on the basis of its source and the methods used to generate it. Scientific literacy also implies the capacity to pose and evaluate arguments based on evidence and to apply conclusions from such arguments appropriately.

hope this helps and sorry if this is wrong

Answer:

D) Cyanidin indicator

Explanation:

Cyanidin indicator has to be used in order to get an emerald green color at a pH of 9.

Indicators are substances that change colour when they are added to acidic or alkaline solutions.

In nature, cyanidin is a reddish-purple (magenta) pigment. It is the major pigment in berries [4] and other red-coloured vegetables such as red sweet potato and purple corn. It appears as a blue-reddish or purple pigment in the plant.

Cyanidin indicator has to be used in order to get an emerald green colour at a pH of 9.

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Answer:

A solution in which the maximum amount of solvent has been dissolved

Explanation:

For example, 36g of salt in 100g of water.

So, if the water is already at 100oC, it would take 11,725 J of energy to convert 5.2 g of liquid water to steam.

For liquid water, the molar heat of vaporization is 40.6 kJ/mol4. If the water is already at 100°C, we can use the following formula to determine the amount of energy needed to convert 5.2 g of liquid water to steam:

Q = mL

What exactly is vaporization heat?

The quantity of enthalpy (heat energy) necessary to convert a liquid substance into a gas or vapour is known as the heat of vaporization1. Joules per mole (J/mole) or, in some cases, calories are used to measure it (C). Enthalpy of vaporization is another name for the heat of vaporization

m is the mass of water being vaporized (in grammes), Q is the needed energy, and L is the molar heat of vaporization (in J/mole).

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To begin, we must change 5.2 g of water into moles:

18.015 g/mole / 5.2 g = 0.288 mole

Then, we can determine Q:

Q is equal to 0.28 mole, 40.6 kJ/mole, and 1000 J/kJ.

Q = 11,725 J

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To produce one molecule of glucose, 6 molecules of carbon dioxide (\(CO_{2}\)), 18 molecules of adenosine triphosphate (ATP), and 12 molecules of nicotinamide adenine dinucleotide phosphate (NADPH) are required.

Glucose, a six-carbon sugar, is synthesized through the process of photosynthesis in plants. It involves the Calvin cycle, which incorporates carbon dioxide, ATP, and NADPH to produce glucose. For each molecule of glucose formed, 6 molecules of carbon dioxide are required.

The energy needed for glucose synthesis is provided by ATP, which is an energy-rich molecule. In the Calvin cycle, the synthesis of one glucose molecule requires 18 molecules of ATP.

NADPH, a coenzyme involved in energy transfer reactions, is required for the reduction of carbon dioxide during the Calvin cycle. In the process, 12 molecules of NADPH are utilized to produce one molecule of glucose. These components play crucial roles in capturing and storing energy, as well as providing carbon atoms for the formation of glucose, which serves as a vital energy source for organisms.

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when 51.8 and 67.5 are multiplied, the product has three significant figures, and when 51.8 and 67.5 are added, the sum has three significant figures.

The significant figures in multiplying  51.8 and 67.5:

51.8 ×  67.5 = 3496.5 = 3.50  × 10^3

Now according to the rules of significant figures

All non-zero numbers and trailing zeros to the right of the decimal are significant. But 10 and power of ten like in this case its 3 are not significant. So the product has three significant figures.

The significant figures in adding 51.8 and 67.5:

51.8 +  67.5 = 119.5

Now, according to the rules of significant figures, all non-zero digits are significant figures. So the sum has 4 significant figures.

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The different colors in Kaleidoscope Lane can be attributed to a mix of colorful objects, reflective surfaces, diverse light sources, and the interaction of colors, creating a visually captivating environment similar to the patterns seen in a kaleidoscope.

The different colors in Kaleidoscope Lane can be seen due to the combination of the following factors:
1. Colorful objects: The lane might be decorated with various colorful items like street art, murals, or decorations, which contribute to the vibrant colors seen in the area.
2. Reflection: A kaleidoscope is an optical instrument that uses mirrors to reflect light and create symmetrical patterns. In Kaleidoscope Lane, reflective surfaces or mirrored installations might be placed to bounce light off and create colorful patterns similar to those seen in a kaleidoscope.
3. Light sources: Different colored lights or filters might be installed in the lane to illuminate the surroundings, which results in a variety of colors being seen.
4. Interaction of colors: As light bounces off multiple surfaces and interacts with various colored objects in the lane, the colors blend and create new combinations, further contributing to the visual spectacle.

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To address the crevice corrosion issue in the high-pressure connectors and piping of the SWRO plant, several remedies can be considered, A SWRO (Sea Water Reverse Osmosis) plant is a water desalination facility that uses reverse osmosis technology to treat seawater or brackish water and produce freshwater

Material Selection: Evaluate the material compatibility with the operating conditions, especially the chloride ion concentration and temperature. Consider using corrosion-resistant alloys such as duplex stainless steel (e.g., 2205) or super duplex stainless steel (e.g., 2507) that have better resistance to chloride-induced corrosion compared to 316L or 317L stainless steel.

Surface Treatment: Apply appropriate surface treatments to enhance corrosion resistance. Passivation or pickling can remove surface contaminants and create a protective oxide layer on the metal surface, reducing the susceptibility to corrosion.

Design Modifications: Evaluate the design of the connectors and piping to minimize crevices and stagnant areas where corrosion can occur. Smooth transitions, avoiding sharp angles or crevices, can help promote better fluid flow and prevent the accumulation of corrosive substances.

Cathodic Protection: Implement cathodic protection methods, such as impressed current or sacrificial anodes, to protect the connectors and piping from corrosion. This technique involves introducing a more easily corroded metal (anode) to the system, which sacrifices itself to protect the connected metal (cathode) from corrosion.

Monitoring and Maintenance: Regularly monitor the corrosion levels and condition of the connectors and piping. Implement a maintenance program that includes periodic inspections, cleaning, and repairs, if necessary, to prevent corrosion from progressing.

It is important to consult with corrosion experts and engineers who specialize in SWRO plant operations to assess the specific conditions, perform material testing, and provide tailored solutions to mitigate the crevice corrosion problem effectively.

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When the flame turns on and heats the gas inside the hot air balloon, the volume of the gas increases.

This is because as the temperature of a gas increases, the molecules in the gas move faster and collide more frequently, creating a greater pressure. This increase in pressure causes the gas to expand, which results in an increase in volume. Therefore, when the flame turns on and heats the gas inside the hot air balloon, the gas molecules move faster, collide more frequently, and create a greater pressure, causing the gas to expand and the volume to increase.

This phenomenon can be explained using the Gas Laws, specifically Charles's Law. Charles's Law states that the volume of a gas is directly proportional to its temperature, as long as the pressure and the amount of gas remain constant.

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The compound that contains only covalent bonds among the given choices is NO₂ (nitrogen dioxide).

Covalent bonds are formed when atoms share electrons, typically between non-metal atoms. In NO₂, nitrogen (N) and oxygen (O) are both nonmetals, and they share electrons to form covalent bonds. On the other hand, the other compounds listed contain both ionic and covalent bonds:

Ca₃(PO₄)₂ (calcium phosphate) contains both ionic and covalent bonds. The calcium cation (Ca²⁺) forms ionic bonds with the phosphate anions (PO₄³⁻), while the phosphate group itself contains covalent bonds.

NH₄OH (ammonium hydroxide) contains both ionic and covalent bonds. The ammonium cation (NH₄⁺) forms ionic bonds with the hydroxide anion (OH⁻), while the covalent bond exists within the ammonium group.

NaCl (sodium chloride) contains ionic bonds. Sodium (Na) is a metal and donates an electron to chlorine (Cl), a nonmetal, resulting in the formation of an ionic compound.

Therefore, the compound NO₂ is the only one among the given choices that contains only covalent bonds.

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Answer:

nimbostratus (cumulonimbus) and stratus

Explanation:

Answer:

b. Electrons have a mass of 1 amu

Explanation:

Mass of electron is 0.00055amu.

Charge= - 1.6×10^−19

By definition, the statement b. is false: Electrons haven't a mass of 1 amu. Electrons have a mass of 0.0005 amu.

All atoms are made up of subatomic particles: protons and neutrons, which are part of their nucleus, and electrons, which revolve around them.

Protons are positively charged, neutrons are neutrally charged, and electrons are negatively charged. Protons and neutrons have roughly the same mass, about 1.674×10⁻²⁴ g, which represents 1 atomic mass unit or amu. An electron has a mass of 9.11×10⁻²⁸ g, which represents 0.0005  amu.

So, the atomic nucleus is the small central part of the atom, with a positive electrical charge and in which most of the mass of the atom is concentrated.

In a neutral atom, the number of electrons is equal to the number of protons, and since they have a negative electrical charge, they compensate.

Then, the statement b. is false: Electrons haven't a mass of 1 amu. Electrons have a mass of 0.0005 amu.

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True is the answer to statement I, and true is the answer to statement II. The relationship between the concentrations of reactants and products of a system at equilibrium is given by the law of mass action.

In other words, the mass action law states that the rate of a chemical reaction is proportional to the concentrations of the reactants. The concentrations of the reactants and products are constant over time when the system reaches equilibrium. The rate of the forward reaction is equal to the rate of the reverse reaction at equilibrium, and there is no net change in the concentration of the reactants and products. When there is a disturbance to an equilibrium system, such as changing the temperature or pressure, the system will shift to re-establish equilibrium.

The two statements given are true, and are in line with the concept of chemical equilibrium. When a chemical reaction reaches equilibrium, the concentrations of the reactants and products no longer change. At equilibrium, the rate of the forward reaction is equal to the rate of the reverse reaction, and the equilibrium position can be changed by changing the temperature, pressure, or concentration of the reactants or products. The mass action law is a mathematical equation that relates the concentrations of the reactants and products to the rate of the chemical reaction. The equilibrium constant is derived from the mass action law and is used to predict the position of equilibrium for a chemical reaction.

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Answer:

B.

No light

C.

Explanation:

B. Maximum in A, Minimum in B

When a colored filter is placed in the path of white light, the light passes through the filter, is of the same color as that of filter.

So, when the white light passes through the red filter, the red light pass through it.

When red light pass through the green filter, the light passes through the green filter is none, so this is dark.

C.

When the nail is placed in ordinary water, it gets rusted due to the oxygen present in water.

When nail is placed in boiling water which is covered with oil, so the rust is very small quantity as boiling water also contains some oxygen.

When the nail is placed in calcium carbonate, it absorb all the moisture of air and no rusting takes place.

So, maximum rusting in test tube A and minimum rusting is in test tube C.  

Answer:

January, 28th.

Explanation:

yeet

Answer:

copper is the only material composed of a single pure substance

Explanation:

plss mark brainliest

Answer:

1st opt.

(copper is the only material consisting of a single pure substance)

Explanation:

an element is made up of only one type of atom, and copper (Cu) as you can see is a single pure atom whereas salt (NaCl) and vinegar (C2H4O2) are both made of different elements.

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The electronic geometry of a carbon dioxide molecule would be linear.Electronic geometry is the shape that occurs when lone pairs and bonding pairs of electrons on a central atom repel one another to create the most stable shape.

The valence-shell electron-pair repulsion (VSEPR) theory can be used to predict the electronic geometries of molecules. The shape of a molecule is determined by its electronic geometry, which depends on the number of lone pairs and bonding pairs on the central atom of the molecule.

The electronic geometry of carbon dioxide Carbon dioxide is a linear molecule. The CO2 molecule is made up of a carbon atom in the middle, with two oxygen atoms on either side of it. The electronic geometry of CO2 is linear.Each oxygen atom has two electron groups, one of which is a double bond between carbon and oxygen, while the other is a lone pair of electrons.

The carbon atom in the center has only two electron groups, both of which are double bonds between carbon and oxygen. As a result, the carbon dioxide molecule has a linear electronic geometry.

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The solution is acidic, and the [H₃O⁺] is 1.78 x 10⁻⁴ M. The pOH is 10.25, the [OH-] is 5.62 x 10⁻¹¹ M, the pKw is 14, and the Kb is 3.16 x 10⁻⁹.


1. Since the pH is less than 7, the solution is acidic.

2. To calculate the [H₃O⁺], use the formula pH = -log[H₃O⁺]. Rearrange to [H₃O⁺] = \(10^-^p^H\)=  \(10^-^3^.^7^5\) = 1.78 x 10⁻⁴ M.

3. Calculate the pOH by subtracting the pH from 14: pOH = 14 - 3.75 = 10.25.

4. To calculate the [OH⁻], use the formula pOH = -log[OH⁻]. Rearrange to [OH-] = \(10^-^p^O^H\) = \(10^-^1^0^.^2^5\) = 5.62 x 10⁻¹¹ M.

5. The pKw (ion product constant of water) is always 14 at 25°C.

6. Calculate the Kb using the relationship Ka * Kb = Kw. First, convert pKa to Ka: Ka = \(10^-^p^K^_a\) = \(10^-^5^.^4^2\) . Then, Kb = Kw / Ka = 10⁻¹⁴ /  \(10^-^5^.^4^2\)  = 3.16 x 10⁻⁹.

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Answer:

So F=2N

Hope this helps.

Explanation:

P= F/A, where P is pressure, F is force, A is area.

So

P=F/A

0.5N/cm2 = F/4cm2 <--(do cross

2N=F multiplication,

4×0.5)

( And pls check on the unit of area u wrote, it should be (4cm2), not (4cm3) Unit of area is cm2.)

Answer: Malleability

Explanation: Is because metals have mobile electrons in their s orbitals.

Hope this helps..

Answer:

The answer to this question is mobile electrons in s orbitals.

The answer to the following question on edg is directional electrons in p orbitals.

Explanation:

If there are 8.59 × 10²² molecules of NaCl in a salt shaker, the mass of the substance is 8.37grams.

The mass of a substance can be calculated by multiplying the number of moles of the substance by its molar mass as follows:

mass = no of moles × molar mass

However, the number of moles must be calculated from the number of molecules as follows:

no of moles = 8.59 × 10²² ÷ 6.02 × 10²³

no of moles = 1.43 × 10-¹moles

molar mass of NaCl = 58.5g/mol

mass of NaCl = 58.5 × 0.143 = 8.37g

Therefore, 8.37grams is the mass of the salt in the shaker.

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Answer:

Answer: 227.5 grams

Explanation:

Answer:

227.5

Explanation:

Acellus

Answer:   A transfer of electrons occurs when fluorine and calcium react to form an ionic compound. This is because calcium is in group two and so forms ions with a two positive charge. ... A pairs of shared electrons makes one covalent bond. The compound formed is known as a molecule***