Rihanna tested two different foods using iodine solution and Benedict's s-
Solution
These were her results.
spaghetti - went blue-black with iodine solution, went blue
with
Benedict's solution
honey - went orange-brown with iodine solution, turned brick red
with Benedict's solution
Describe how Rhianna tested the foods with Benedict's solution.
Construct a results table and fill it in to show Rhianna's results clearl
What conclusions can Rhianna make from her results?

Answer:

Explanation:

english please

The balanced chemical equation for the reaction associated with the heat of formation for [tex]AgNO_{3}[/tex]

Decomposition is a type of chemical reaction when a single reactant breaks down into two or more different products. The term "thermal decomposition process" refers to the decomposition method used when heat is present.

The enthalpy change that takes place when 1 mole of a substance is created from its component elements in their standard states is known as the standard enthalpy of formation. A pure element has a standard enthalpy of production of 0 in its normal state.

Enthalpy of formation = Enthalpy change 1 mole of product formed from its original constituents.

[tex]Ag(s) + \frac{1}{2} N_{2}(g) + \frac{3}{2}O_{2} \rightarrow AgNO_{3}[/tex]

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refer the pic above for answer

The released air produces an equal force in the opposite direction of the motion of the air, which causes the balloon to move forward in accordance with Newton's Third Law of Motion.

As the balloon climbs, friction develops between the moving balloon and the air molecules it encounters. In opposition to the lift, drag and gravity's pull on the balloon's mass both exert downward forces. The balloon rises if the lift is greater than the drag and gravity's pull. One component of the force pair is the force of the balloon on the air, and the other component is the force of the air on the balloon.

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Answer:

Kinetic energy has its determining factors and those are mass and speed or velocity

whereas the determining factors of potential energy are height, distance and mass.

EXAMPLE OF K.E

kinetic energy could be flowing water...

EXAMPLE OF P.E

potential energy is the water that is present at the top of the hill.

0.0781 mol of N2 would be there at a pressure of 0.3atm at 30°C

Avogadro's number can be used to convert between molecules and moles by multiplying or dividing: The amount of moles must be multiplied by 6.02 x 1023 to convert to molecules. Divide the number of molecules by 6.02 x 1023 to convert it to moles.

At STP defined as 0°C (273.15 K, 32°F) and 1 atm, the molar volume of a gas is 22.414 L/mol.

Use dimensional analysis to calculate the moles of nitrogen in 1.75 L at STP.

1.75 L N₂ × 1 mol/22.414 L = 0.0781 mol N₂ to three 2 significant figures.

A mole is 6.02214076 x 1023 of any chemical unit, including atoms, molecules, ions, and others. Due to the large number of atoms, molecules, or other components that make up any substance, the mole is a useful unit to use.

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The cell potential of an electrochemical cell with the cell reaction  is 1. 607 v.  the maximum electrical work obtainable from this cell when 0. 50 g of al is consumed is - 9.3 × 10⁵ J.

The reaction is given as :

2Al  +  3Zn²⁺  ---->   3Zn   +   2Al³⁺

the maximum electrical work obtainable from this cell:

ΔG = - n FE°cell

where,

maximum electrical work = ΔG

n = no. of transfer electron = 2 × 3 = 6 e⁻

E°cell = 1.607 V

ΔG = - n FE°cell

ΔG = - 6 × 9.65 × 10⁴ ×  1.607

ΔG = - 9.3 × 10⁵ J

Thus the maximum electrical work obtain from this cell is - 9.3 × 10⁵ J.

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This reaction is neutralization reaction.
2HNO3+2KOH⇒ 2KNO3+2H2O

What is neutralization reaction?

A neutralization reaction is a type of chemical reaction in which an acid and a base react with one another to form a salt and water. The acid and the base each donate one or more protons (H+ ions) to form a neutral compound. This type of reaction is important in many everyday applications, from the neutralization of stomach acid to the processing of industrial waste.

Acid+Base⇒Salt+Water

The given reaction is neutralization reaction because potassium nitrate salt is formed, and water is produced.

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Engineered wood products type of building material can be highly combustible and produce toxic gases when exposed to fire.

Its construction materials exhibit a variety of flaws and stone degradation patterns, including color fading, spalling, and flaking.

Materials comprised of wood fibers connected by glue or binders may be extremely flammable, release hazardous fumes, or degrade quickly when exposed to fire. Building firewalls involves using walls.

In North America, wood is the most widely used building material and the foundation of many different structural systems. Wood's response to fire conditions is influenced by its size and moisture content.

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Each aminoacyl-tRNA synthetase's active site fits a certain amino acid and its associated tRNA like a "lock and key." The amino acid is subsequently joined to the tRNA using ATP.

What is endergonic process?

Hence lock and key model is used

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The classifications of the reactions are;

A . Synthesis

B. Decomposition

C. Combustion reaction

D. Single replacement

E. Double replacement

We know that in chemistry, what we call a reaction has to do with the interaction that is taking lace between two or more substances and leads to the production of a new substances. We have to look at the reacts that are here and then know how to classify each one.

In fact the combustion reaction has to do with the burning of a species in air. A single replacement has to do with the substitution of a given specie in a compound with another. A double replacement reaction has to do with a case where the anions interchange cation partners. The synthesis reaction deals with the production of new compounds while the decomposition reaction has to do with the compound into its components.

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Answer:

Na2CO3 + 2HNO3 → CO2 + H2O + 2NaNO3

Explanation:

The picture that can be encoded by the pattern 000010000 is

9 squares in 3 rows and 3 columns, with only the center square filled in.

A pattern in mathematics is a series of recurring figures, shapes, or numbers. Any kind of event or thing can be connected to a pattern.

A pattern has a rule that identifies the items that are part of the pattern and those that are not.

The pattern representing blank and filled can be encoded as follows

let 0 represents blank and 1 represent fill

The pattern 000010000 can be rewritten as

0 0 0

0 1 0

0 0 0

The represents 3 rows and 3 columns where all are blanks except the center is filled in

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Average kinetic energy is the average sum of all kinetic energy of all the molecules of gases. Therefore, the kinetic energy of the cart is 450J. Average kinetic energy is directly proportional to temperature.

It is a energy which is possess  by a moving object. It is very difficult to find the correct value of kinetic energy so we find average kinetic energy. Which is very easy to calculate as compared to calculating kinetic energy.  It is not dependent on the type of gases or mass of gases.

Mathematically,

K.E=1/2mv²

Where,

m= mass of object= 225 kg

v= velocity of object= 2 m/s

substituting all the given values in the above equation, we get

K.E=1/2×225 ×2²

K.E=450J

Therefore, the kinetic energy of the cart is 450J.

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Considering the definition of empirical formula, if a sample has 28g nitrogen and 64g oxygen, the empirical formula is NO₂.

The empirical formula is an expression that represents the atoms that make up a chemical compound regardless of its structure. It is therefore the simplest representation of a compound.

The empirical formula indicates the elements that are present and the minimum proportion in whole numbers that exist between its atoms.

In this case, in first place you need to convert the number of grams given into percentage as follow, being the mass of the sample 92 grams (mass of nitrogen + mass of oxygen):

Assuming a 100 grams sample, the percentages match the grams in the sample. So you have:

Then it is possible to calculate the number of moles of each atom in the molecule, taking into account the corresponding molar mass:

Nitrogen (N): 30.43 grams÷ 14 g/mole= 2.17 moles

Oxygen (O): 69.57 grams÷ 16 g/mole= 4.35 moles

The empirical formula must be expressed using whole number relationships, for this the numbers of moles are divided by the smallest result of those obtained. In this case:

Nitrogen (N): 2.17 moles÷ 2.17 moles= 1

Oxygen (O): 4.35 moles÷ 2.17 moles= 2

Therefore the N: O mole ratio is 1: 2

Finally, the empirical formula is N₁O₂= NO₂.

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A 0.0733L balloon contains 0.00230 mol at a pressure of 0.924 atm.

V=0.0733 L

n=0.00230

P=0.924 atm

From the ideal gas law:

T=PV/nR

T= 359.12K

What is the ideal gas law?

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The nuclear binding energy of silver is 1.5E-24  j/nucleon where the mass of a silver is 110

Formula used

Binding Energy per Nucleon = (Mass Defect×931.5)/Mass Number

B.E per nucleon = (∆m×931.5)/A

The bare minimal amount of energy needed to separate an atom's nucleus into its component protons and neutrons—collectively referred to as nucleons—is known as the nuclear binding energy in experimental physics. For stable nuclei, the binding energy is always positive since the nucleus needs to gain energy for the nucleons to move apart from one another. The strong nuclear force pulls nucleons toward one another. The nuclear binding energy is thought to be negative in nuclear physics theory. When the constituent nucleons are infinitely far apart from one another, it shows the energy of the nucleus in relation to their energies. With slightly differing emphasis on what the binding energy signifies, the experimental and theoretical points of view are equivalent.

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Explanation:

MAUNA LOA (VNUM #332020)

19°28'30" N 155°36'29" W, Summit Elevation 13681 ft (4170 m)

Current Volcano Alert Level: WARNING

Current Aviation Color Code: ORANGE

The Northeast Rift Zone eruption of Mauna Loa continues. One active fissure, fissure 3, is feeding a lava flow downslope.

Fissure 3 is generating a lava flow traveling to the north toward the Daniel K. Inouye Highway (Saddle Road) that has reached relatively flatter ground and slowed down significantly over the past several days, as expected.

As of 12 p.m. today, December 4, the flow front was about 2.25 mi (3.6 km) from the Daniel K. Inouye Highway (Saddle Road). Where the fissure 3 lava channel is branching, on the steeper slopes of the Northeast flank about half way down the lava flow, there were several small overflows recorded over the past day. During the past 24 hours, the lava flow advanced at an average rate of about 40 feet per hour (12 meters per hour). Though the advance rate has slowed over the past several days, the lava flow remains active with a continuous supply from the fissure 3 vent.

Advance rates may be highly variable over the coming days and weeks. On the flat ground between Mauna Loa and Mauna Kea, lava flows advance more slowly, spread out, and inflate. Individual lobes may advance quickly, and then stall. Additional breakouts may occur if lava channels get blocked upslope. There are many variables at play and both the direction and timing of flow advances are expected to change over periods of hours to days, making it difficult to estimate when or if the flow will impact Daniel K. Inouye Highway.

Sulfur dioxide (SO2) emission rates of approximately 180,000 tonnes per day (t/d) were measured on December 1, 2022 and remain elevated at this time. Volcanic gas is rising high and vertically into the atmosphere before being blown to the west at high altitude, generating vog (volcanic air pollution) in areas downwind. The International Volcanic Health Hazard Network has detailed information about

Answer: B3N3H6

Explanation:

I am pretty sure the formula for benzene is B3N3H6. If I am wrong, I am sorry, I learned this a long time ago.

The statement that describes a way in which humans could increase biodiversity in a marine ecosystem is as follows: Fish populations increase as dissolved oxygen decreases (option A).

Biodiversity is the diversity (number and variety of species) of plant and animal life within a region.

It can be used more specifically to refer to all of the species in one region or ecosystem. Biodiversity refers to every living thing, including plants, bacteria, animals, and humans.

Marine ecosystem are aquatic environments with high levels of dissolved salt. These include the open ocean, the deep-sea ocean, and coastal marine ecosystems, each of which has different physical and biological characteristics.

The biodiversity of a marine ecosystem can be illustrated by the increase in fish populations in the marine environment, hence, option A is correct.

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Answer: Selenium

Explanation: Selenium is a non metal  

There can be no zero for the main quantum number (n). Therefore, the permitted values for n are 1, 2, 3, 4, and so forth. Any integer between 0 and n – 1 can serve as the angular quantum number (l).

The value of n is between 1 and the outermost electron shell of that atom. Looking at the period (numbered row) of the element on the periodic table will reveal the primary quantum number. The period number and the primary quantum numbers of electrons in the S-block and P-block are identical.

There are three values if n=3 is the primary quantum number. The electron is in a p-orbital state when l=1, and the electron.

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4.1g of sodium phosphate is required to prepare 250.0 ml of a solution that is 0.30 m in sodium ion.

The important thing to note here is that each mole of trisodium phosphate ([tex]Na_{3}PO_{4}[/tex]) gives us 3 moles of Na ions. So a solution that is 0.30 M in sodium ion is only 0.10 M in [tex]Na_{3}PO_{4}[/tex].

Now, molarity is moles/L, so we can figure out the total number of moles we need:

0.10 mol/L × 0.250 L = 0.025 moles [tex]Na_{3}PO_{4}[/tex].

Finally, the MW of [tex]Na_{3}PO_{4}[/tex] = 164 g/mol.

So: 0.025 moles × 164 g/mol = 4.1 g

So you would need 4.1 g of trisodium phosphate to make 250 mL of this solution.

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X-rays are a form of indirectly ionizing radiation, and it can be really harmful to the humans health, so limiting the exposure is always a priority. Here, wearing a protective vest is the correct answer.

X-rays are a type of radiation that ionizes indirectly. Remember that ionization is what harms our cells, thus it is best to minimize exposure to these radiation types.

Now when X-rays are strong enough, they can penetrate through many ordinary materials (like wood, plastic, etc.) Also, once it enters in your body, a series of responses begin that cannot be stopped by outside forces.

Therefore, you should try to minimize your exposure. If possible, avoid being close to an X-ray source, but if that's not possible, use radiation protection.

Depending on the application, it can come in many shapes. For example, you can use LED screens to block out the fluence (flux of photons) that is focused at you. By placing these screens between you and the source, you can significantly reduce this fluence.

The same is true with protective vests that shield you from photons by absorbing them. These vests can include parts made of lead or other high atomic number materials.

So, a person can wearing a protective vest to limit exposure to X-rays.

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