When you use a spectrophotometer, should you set the wavelength of light to be the same color as that of the solution, or would a different color be more appropriate? Explain.

i cant understand your question define briefly

Answer:

1192.54 J

Explanation:

Applying,

Q = cm(t₂-t₁)................ Equation 1

Where Q = Amount of heat lost, c = specific heat capacity of the iron, m = mass of the iron, t₁ = initial temperature, t₂ = final temperature.

From the question,

Given: m = 83 g = 0.083 kg, t₁ = 297 K, t₂ = 329 K

Constant: c = 449 J/kg.K

Substitute these values into equation 1

Q = 449(0.083)(329-297)

Q = 449(0.083)(32)

Q = 1192.54 J

Answer: C

Explanation:

The N2 should have a triple bond because it needs three covalent bonds to fill its outer shell. This means the two atoms need to share three electrons each.

It also serves as a nice illustration of a triple-bonded molecule. For the Lewis structure of N2, there are ten accessible valence electrons. Therefore, option C is correct.

The diagrams known as Lewis structures, often referred to as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, depict the interactions between the atoms in a molecule as well as any lone pairs of electrons that may be present.

It contradicts the octet rule, as shown by the production of molecules, and could not account for the release of energy during the formation of covalent bonds.

The three parallel lines between the N atoms represent three bonds. This is a triple bond, with one electron from each N atom contributing to each bond. A total of 6 electrons are thus represented by this triple bond.

Thus, option C is correct.

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The periodic table with masses is very useful as the atomic mass is the average number of protons and neutrons in atoms of a chemical elements, which allows for the natural abundances of the element's isotopes.

Generally, atomic mass of an element is defined as the number of times an atom of that element which is heavier than an atom of carbon taken as 12. Basically, one atomic mass unit is equal to one-twelfth of the mass of an atom of carbon 12 isotope.

In the modern periodic table atomic number is present at the upper left, or number of protons. And in the middle the letter is the symbol used for the element (e.g., H). And below is the relative atomic mass, as calculated for the isotopes found naturally on Earth. Finally at the very bottom is the name of the element (e.g., hydrogen).

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Answer:

B

Explanation:

Chemical reactions involve electron rearrangements. Nuclear reactions involve changes to the nucleus.

Answer:

B

Explanation:

The mass of 2.80 moles of H2O is approximately 50.441 grams.

Molar mass is the mass of one mole of a substance and is expressed in units of grams per mole (g/mol). It is calculated by summing the atomic masses of all the atoms in a molecule, and it is expressed in the same units as atomic mass, which is atomic mass units (amu).

The molar mass of water (H2O) is 18.01528 g/mol (2 hydrogen atoms with atomic mass 1.008 and 1 oxygen atom with atomic mass 15.999).

To find the mass of 2.80 moles of H2O, we can use the following formula:

mass = number of moles x molar mass

Plugging in the values, we get:

mass = 2.80 mol x 18.01528 g/mol

mass = 50.441 g

Therefore, the mass of 2.80 moles of H2O is approximately 50.441 grams.

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Plants produce glucose and oxygen in an endothermic reaction called photosynthesis. The mass of glucose, C6H12O6, made when 1.0g of water reacts with carbon dioxide is 60gm.

Photosynthesis is a process used by plants and other organisms to change light energy into chemical energy that, through cellular respiration, can later be passed to fuel the organism's activities.

6H₂O + 6CO₂ CH12O6 + 602

We must convert the water to moles. We know that the molar mass of

Water 18

= 1 / 18

= 0.055

Now we look at our chemical equation's mole ratios. We can see that

6 moles of water produce 1 mole of glucose.

therefore, we will have 1/3 mol of glucose

The molar mass of glucose is 180

= 60gm of glucose will produce.

Thus, the mass of glucose, C6H12O6, made when 1.0g of water reacts with carbon dioxide is 60gm.

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Answer:

Water is the primary erosion

hope it helps :)

Ionic and covalent bonds can occur in substances that have a repeating lattice structure.

Ionic bonds are formed when an atom donates electron (s) to another atom. Covalent bonds, on the other hand, are formed when two atoms share electrons to complete their octet states.

Ionic compounds are formed from a combination of metal and non-metal atoms. They usually have crystalline lattice structures with high melting points.

Covalent compounds are formed between non-metal atoms. They can also have lattice structures but generally have lower melting points because the forces holding the molecules together are weaker.

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Answer:

Occurs in substances that have a repeating lattice structure

Explanation:

Answer:

stratus​

Explanation:

The type of cloud that forms close to the ground when the temperature is just above the dew point would be stratus.

Stratus cloud forms when moisture condenses at low-level as a result of light air current pushing cold air above a pocket of warm air.

Stratus clouds are the most similar to fog among all the cloud types because both are formed at low altitudes. However, while fogs are formed from ground moisture, stratus clouds are formed from air moisture.

Answer: C-fog

Explanation: Cirrus, cumulus, and stratus, all form high. Fog forms low.

Answer:

A) Chemical Change

Explanation:

Chemical changes occur when bonds are broken and formed between molecules or atoms. This means that one substance with a particular set of properties (such as melting point, color, taste, etc.) is turned into a different substance with different properties.

"his performing the first successful heart surgery" - This is the correct choice.

The components that are common to both ATP and NAD are: adenine and ribose. Adenine and ribose are both found in ATP and NAD molecules.

ATP stands for Adenosine Triphosphate, which is the primary energy carrier in cells. ATP is an energy-rich molecule that stores energy that can be used by the cell. It is composed of three phosphate groups, an adenine base, and a ribose sugar.

NAD stands for Nicotinamide Adenine Dinucleotide, which is an electron carrier molecule that is involved in many cellular metabolic reactions. It is composed of two nucleotides (adenine and ribose) linked by two phosphate groups.

The oxidized form of NAD is NAD+ while the reduced form is NADH.

The components of ATP and NAD are: Adenine and ribose are the two components common to both ATP and NAD.

Other components are specific to each molecule, as follows: ATP components: Three phosphate groups An adenine base A ribose sugar NAD+ components: Nicotinamide (a type of vitamin B3)Adenine A ribose sugar Two phosphate groups.

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KSCN or potassium thiocyanate will degrade the sample overtime. Therefore, we need to wait to add kscn to add just before absorbance measurements.

Potassium thiocyanate is a chemical compound used for the electroplating of metal surface and also used as an analytical reagent in colorimeter tests.

    Colorimeter is a device used for calculating the concentration of a sample or the absorbance of a sample through a certain wavelength of polarized light. Colorimeter runs on the application of Beer-Lambert's law also known as Beer's law that states that, the absorbance and concentration of a solution is directly proportional to each other.

    According to Beer-Lambert's law, we need to add a certain reagent such as- potassium thiocyanate or biuret's reagent to the solution as they deviate the polarized light and given the reading of the absorbance of the solution. Even though, the reagents help us in getting the correct result of the colorimetry test, it can also degrade the solution by breaking the compounds present in the solution.

Thus, we need to add the reagents right before taking the reading to prevent any kind of mishappening.

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PbO2 (s) + 4 HCl (aq) → PbCl2 (s) + Cl2 (g) + 2 H2O (l)

This is an oxidation-reduction (redox) reaction:

PbIV + 2 e- → PbII

(reduction)

2 Cl-I - 2 e- → 2 Cl0

(oxidation)

PbO2 is an oxidizing agent, HCl is a reducing agent.

The specific heat of titanium is 0.69 J/ g c.

The specific heat of titanium can be calculated by using the principle of calorimetry.

According to this principle, the heat lost by one body is equal to the heat gained by another body in contact with it.

The heat(Q) is calculated by the following formula,

Q = m(s)(ΔT)

Here m is the mass of the body

s is the specific heat of the body

ΔT is the change in temperature

Thus, the heat lost by titanium metal is equal to the heat gained by water present in the calorimeter,

(msΔT)Titanium= (msΔT)Water

Putting the given values in the above equation

15.7 x s x 99.5-24.3 = 75 x 4.184 x 24.3-21.7

s = 0.69 J/g C

Thus, the specific heat of titanium is 0.69 J/ g c.

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Using the equation H=cpmT and the water specific heat, the amount of heat received is determined. 4. At 100oC, water vaporizes into vapour.

The fact that it requires a lot of energy to boil water is one of its most important characteristics. To be precise, one calorie of heat must be absorbed by 4,184 Joules of water for one degree Celsius of temperature rise. To provide some context, 1 kilogram of copper can be heated to 1°C with just 385 Joules of heat.

Water takes energy during the freezing, evaporation, and sublimation processes. The water molecules alter their bonding structure and transition to a higher energy state as a result of the energy received. This energy must be provided by the atmosphere in the Earth system.

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A sugar, a phosphate group, and a nitrogen base form the building blocks of Nucleic Acids.

What are nucleic acids?

In the category of macromolecules, nucleic acid is a biomolecule. Nucleic acid is made up of nucleotides. A nitrogenous base, a phosphate group, and a 5-carbon sugar make up a nucleotide.

The primary element of a living thing's genetic makeup is a nucleic acid. It is made of RNA and DNA. Animals and plants typically contain DNA, while some bacteria and plants also include RNA.

In 1868, nucleic acid was first identified. A Swiss researcher found it in white blood cells. They were initially called nuclein. They are crucial to the process of protein synthesis.

Thus, the correct option is  Nucleic Acids.

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Because only certain size electron orbits are allowable, the frequency and energy of the electron is quantized

According to the Bohr model of the atom, an electron moves from a lower to a higher energy level when it absorbs energy. This energy is released when the electron returns to ground state.

According to the Bohr model, only certain size electron orbits are allowable hence the frequency and energy of the electron is quantized.

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Bill Nye is an American scientific educator, engineer, and television host who goes by the moniker "Bill Nye the Science Man. "Children were the target audience for the program, which used humor, experiments, and demonstrations to teach scientific principles in a fun and approachable way.

Phases of matter are the various phases that matter can take on depending on its physical characteristics as well as the ambient temperature and pressure. Matter exists in three basic states: solid, liquid, and gas.

The "Phases of Matter" video by Bill Nye the Science Man teaches you the following 10 things:

There are three basic phases of matter: solid, liquid, and gas. Matter is everything that has mass and occupies space.

Because their molecules are closely packed together and immobile, solids have a definite shape and volume.

Because their molecules can move and slide past one another, liquids have a constant volume but adopt the shape of the container.

Because their molecules are spaced far apart and are free to flow in any direction, gases don't have a set shape or volume.

By adding or subtracting heat energy, a substance can transition from one phase to another.

A substance's melting point is the temperature at which it turns from a solid to a liquid, and its boiling point is the temperature at which it turns from a liquid to a gas.

Because water has a higher melting and boiling point than other molecules of a similar size, it is a unique substance.

Moreover, a change in pressure or a chemical reaction can cause a substance to transition from one phase to another.

In extremely high temperatures and pressures, matter can exist in other states like plasma and Bose-Einstein condensate.

For the purpose of comprehending the behavior of materials and creating new technologies, the study of matter and its phases is crucial.

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Answer:

It is really easy and I don't want you to get in trouble for using other people's work I'm not saying i can't help but I think its wrong no offense  

Explanation:

Explanation:

We are given different isotopes and we have to identify the number of protons and neutrons that are in the nuclueus of each atom.

a) Carbon-14:

By definition two isotopes are atoms that have the same atomic number but different mass number. The atomic number of an atom is equal to the number of protons of that atom, and the mass number is equal to the number of protons plus the number of neutrons.

atomic number = n° of protons

mass number = n° of protons + n° of neutrons

n° of protons = atomic number

n° of neutrons = mass number - n° of protons

n° of neutrons = mass number - atomic number

If two isotopes have the same atomic number but different mass number we can say that two isotopes have the same number of protons but different number of neutrons.

In we pay attention to carbon-14 we can look for its atomic number in the period table: 6. And its mass number is the one that we are given after the name of the element: 14.

n° of protons = atomic number = 6

n° of protons = 6

n° of neutrons = mass number - atomic number = 14 - 6

n° of neutrons = 8

b) Cobalt-60:

atomic number = 27 (from the periodic table)

mass number = 60

n° of protons = atomic number = 27

n° of protons = 27

n° of neutrons = mass number - atomic number = 60 - 27

n° of neutrons = 33

c) Gold-197:

atomic number = 79 (from the periodic table)

mass number = 197

n° of protons = atomic number = 79

n° of protons = 79

n° of neutrons = mass number - atomic number = 197 - 79

n° of neutrons = 118

d) Uranium-235:

atomic number = 92 (from the periodic table)

mass number = 235

n° of protons = atomic number = 92

n° of protons = 92

n° of neutrons = mass number - atomic number = 235 - 92

n° of neutrons = 143

Answer:

a) Carbon-14: n° of protons = 6 n° of neutrons = 8

b) Cobalt-60: n° of protons = 27 n° of neutrons = 33

c) Gold-197: n° of protons = 79 n° of neutrons = 118

d) Uranium-235: n° of protons = 92 n° of neutrons = 143

Answer:

Decane doesn't have any free electrons because all the electrons of carbon is used for bonding.

Answer:

B.

Explanation:

Lol notes brought everything but B. Up

Answer:

Wildfire

Explanation:

Fire go brrrr

A tropical cyclone is a  natural disaster which  is likely to cause the most widespread damage in a coastal ecosystem.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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Answer:

See explanation

Explanation:

The leaves or needles of evergreen trees lose less water than other kinds of leaves. This means that they are better able to conserve water in  the taiga, a cold biome with long, dark winters.

These conifers possess adaptations that are able to help them survive the long, cold winters and short summers in a typical taiga biome since their needles contain very little sap, which also helps prevent them from freezing.