A fifth-grade science class puts half of a white tablet in a test tube with 10 milliliters (mL) of water at 21°C (70°F). The tablet bubbles rapidly for three minutes until it is gone. Students record the final temperaturo at 20°C (637)
Which choice best identifies evidence that a chemical reaction occurred?
tablet was white
tablet broke in hall
tablet dissolved in the water
change in water temperature

there are an infinite number of ways to synthesize an answer to a question, including the following:

Summarize the key points in a concise manner.

Provide a detailed explanation of the topic.

Use examples or analogies to illustrate the concept.

Break down the answer into smaller, more digestible pieces.

Address potential counterarguments or alternative perspectives.

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Compare and contrast different aspects of the topic.

Provide historical context or a timeline of events.

Use a storytelling approach to engage the reader.

Use a Q&A format to organize the information.

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Scenes A–I show numerous atomic-scale forms of materials. A substance that overflows its container

Quarks and leptons are the two simplest types of basic particles that make up matter (the class of elementary particles that includes electrons). Quarks combine to create protons and neutrons, which together with electrons create the atoms of the periodic table's elements like hydrogen, oxygen, and iron.

Understanding and manipulating materials at the atomic or molecular level is the goal of nanotechnology. The nanotubes on which this insect is walking were made possible because to advances in nanotechnology.

The molecular forces in the gas phase are quite weak. When a gas is placed in a container, it fills it, taking on both its shape and volume. Fluids (Liquids and Gases).

Therefore, the correct answer is option

(a) A mixture that fills its container

(d) A homogeneous mixture

(g) A gas that can be broken down into simpler substances

(j) A heterogeneous mixture

(k) Matter that obeys the law of definite composition

The complete question is:

Scenes A-I depict various types of matter on the atomic scale. Choose the correct scene(s) for each of the following:

(a) A mixture that fills its container

(b) A substance that cannot be broken down into simpler ones

(c) An element with a very high resistance to flow

(d) A homogeneous mixture

(e) An element that conforms to the walls of its container and displays a surface

(f) A gas consisting of diatomic particles

(g) A gas that can be broken down into simpler substances

(h) A substance with a 2/1 ratio of its component atoms

(i) Matter that can be separated into its component substances by physical means

(j) A heterogeneous mixture

(k) Matter that obeys the law of definite composition

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Answer:

1120 L.

Explanation:

Hello!

In this case, as no conditions of pressure of temperature are given for this problem, we can assume that the scuba diver dives at STP (1 atm and 273.15 K), which means that 1 mole of air would occupy a volume of 22.4 L.

In such a way, since she needs 50.0 moles of air, the following ratio is useful to compute the size (volume) of the tank she needs:

\(V_2=\frac{V_1*n_2}{n_1}\)

Thereby, we plug in to obtain:

\(V_2=\frac{22.4L*50.0mol}{1mol}\\\\V_2=1120 L\)

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The amount of heat lost by the copper is 2402.4 J.

To Calculate the amount of heat lost, we use the formula below.

From the question,

Substitute these values into equation 1.

Hence, The heat lost by the copper is 2402.4 J

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1. First, let's state the chemical reaction based on the given description. Copper (Cu) and silver nitrate (AgNO3) are the reactants and there is a single replacement:

The next step is to convert from grams to moles 15.00 g of Cu, using its molar mass which you can find in the periodic table (63.5 g/mol):

Now, with this value, we can find the number of moles of silver. You can see that in the reaction 1 mol of Cu reacts and produces 1 mol of silver (Ag), so the mol ratio is 1:1, meaning that it is producing the same number of moles of Cu but what would be its mass of 0.2362 moles of Ag? We need to use the molar mass of Ag which is 107.87 g/mol:

The answer is that 15.00 g of copper (Cu) with an excess of silver nitrate produces 25.48 g of silver (Ag).

2. Let's convert grams of Ag to oz:

And now, let's see how much would 0.8994 oz of silver we can collect:

The answer is $4.047.

Answer:

Explanation:

The density of a substance can be found by using the formula

\(d = \frac{m}{v} \\ \)

We have

\(d = \frac{1.25 \times {10}^{2} }{51} \\ = 2.45098..\)

We have the final answer as

Hope this helps you

The molarity of vinegar is 0.47368421 moles per liter.

To calculate this, we can use the following formula:

molarity = (initial_volume - total_volume_change) / final_volume

In this case, the initial volume is 7.5 mL, the total volume change is 21 mL, and the final volume is 28.5 mL. Plugging these values into the formula, we get:

molarity = (7.5 - 21) / 28.5 = -0.47368421

The negative value for molarity indicates that the solution is diluted. This is because the total volume of the solution increased by 21 mL, while the amount of solute (acetic acid) remained the same.

It is important to note that the molarity of a solution can change depending on the temperature. This is because the volume of a solution expands as it gets warmer. Therefore, it is important to measure the volume and temperature of a solution at the same time to get an accurate measurement of its molarity.

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When 6.8776g of aluminium reacts with an excess of oxygen, 6.8776g of aluminium oxide are produced.

What is the name of aluminum oxide?

Al2O3 is an inorganic chemical reagent with the chemical name aluminum oxide. Other names for it include alumina, alundum, al-alumina, and aloxide.

If there are 4 moles of Al that equals 107.926156 grams of 4Al

If there are 2 moles of Al2O3 that equals 203.9226g

If  107.9261 grams of 4Al equals 203.9226 grams of 2Al2O3 then, 3.64g of Al equals x

107.9261 / 3.64 = 203.9226 / x

(107.9261) x = (203.9226) 3.64

107.9261 x = 742.2782

dividing both LHS and RHS by 107.9261,

107.9261/107.9261x = 742.2782/107.9261

                             x = 6.8776g

Hence, 6.8776g of aluminium oxide are produced.

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8.253 is the pH of a 0.307 M solution of NaNO\(_2\). The ionization constant, a, for the acid, HNO\(_2\), is 4.60×10⁻⁴.

In chemistry, the pH scale is used to define the level of basicity or acidity of an aqueous. pH has historically stood for " Hydrogen potential" (or "power of hydrogen").

Lower pH values are recorded for acid solution (solutions with greater H ion concentrations) than for basic or alkaline solutions.

NO\(_2\)⁻ + H\(_2\)O → HNO\(_2\) + OH⁻

Kb = [HNO\(_2\) ][OH⁻]/[NO\(_2\)⁻]

Kb = 1.00X10⁻¹⁴

Kb = 1.00X10⁻¹⁴/ 4.60X10⁻⁴= 2.17X10⁻¹¹

[HNO\(_2\) ] = [OH⁻] = x

[NO\(_2\)⁻ ] = 0.148-x

Kb = 2.17X10⁻¹¹= x² / 0.148

x = [OH⁻] = 1.79X10⁻⁶

pOH = 5.747

pH = 14.000 - pOH = 8.253

Therefore, 8.253 is the pH of a 0.307 M solution of NaNO\(_2\). The ionization constant, a, for the acid, HNO\(_2\), is 4.60×10⁻⁴.

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The Kb for the conjugate base of HF, Fluoride ion is 1.470588 * 10^-11

The conjugate base of HF (hydrofluoric acid) is fluoride ion, F-

Ka of HF or hydrofluoric acid is given as 6.8 × 10⁻⁴

Kw = Ka * Kb

Where,

Kb = Base dissociation constant

Kw = Water dissociation constant or equilibrium constant

Ka = Acid dissociation constant

Kw = [H+] [OH-] = 1.0 X 10-14 at room temperature

The formula can be rewritten as,

Kb = (Kw / Ka)

     = (10^-14) / (6.8 * 10^-4)

     = 1.470588 * 10^-11

Therefore, the kb for the conjugate base of HF, Fluoride ion is 1.470588 * 10^-11

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Digital road maps are different from paper and road maps in that they allow users to plan routes before a trip, they can be used anywhere in the world, and they can be updated almost immediately. They also show both major and minor roads in a region.

Digital road maps are a type of digital map that is based on GIS data. This data is collected from various sources and is used to create a detailed representation of the real world.  The digital road map allows the user to zoom in and out and to see different levels of detail, depending on their needs. They also allow the user to search for specific locations, find directions, and plan routes before they begin their trip.

On the other hand, paper maps are usually printed on paper and can be difficult to read in low light conditions. They are also limited in the amount of detail that they can show, and they may not always be up-to-date.

Road maps, on the other hand, are a type of map that shows roads and highways in a region. They may include some additional features such as rest areas, gas stations, and other points of interest. Road maps are typically printed on paper and are often used for navigation while driving. They are not as detailed as digital road maps, and they can quickly become outdated as new roads are built.

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The molar mass is 3230.8 g/mol

First, we need to know that the formula for the general gas law  is represented as;

PV = nRT

such that the parameters are;

Substitute the values

1 × 2.33 = n × 8.314 × 433.15

Multiply the values, we get;

n = 2.33/ 8.314 × 433.15

Divide the values

n = 6.5 × 10⁻⁴ moles

But, number of moles = mass/molar mass

Molar mass = 2.10/ 6.5 × 10⁻⁴

Molar mass = 3230.8 g/mol

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The energy range expected is 6.6 × 10^-19 J < E < 7.33 × 10^-19 J

The energy of the photon is given by;

E = hc/λ

E = energy of the photon

h = Plank's constant

c = speed of light

λ = wavelength of light

For the upper boundary range;

E = ?

h = 6.6 × 10^-34 Js

c = 3  × 10^8 m/s

λ = 270 × 10^-9

E =  6.6 × 10^-34 Js × 3  × 10^8 m/s / 270 × 10^-9

E = 7.33 × 10^-19 J

For the lower range;

E = ?

h = 6.6 × 10^-34 Js

c = 3  × 10^8 m/s

λ =300 × 10^-9

E =  6.6 × 10^-34 Js × 3  × 10^8 m/s / 300 × 10^-9

E = 6.6 × 10^-19 J

Hence, the energy range 6.6 × 10^-19 J < E <  7.33 × 10^-19 J

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Answer:

Cr(OH)3

Explanation:

The addition of 6M sodium hydroxide to a solution that contains chromium(III) ion leads to the net ionic reaction;

3 OH^-(aq) + Cr^3+(aq) -------> Cr(OH)3(s)

Cr(OH)3 is insoluble except an excess of the hydroxide is added then the precipitate dissolves as follows;

Cr^3+(aq) + 4OH^-(aq)------> [Cr(OH)4]^-

According to the data of the experiment the reaction that is presented is the oxidation of the metal Mg to obtain MgO, the reaction is as follows:

Answer:

biological decay

Explanation:

Hope this helps

Answer:

true

because with the both states we increase the surface of reaction

Answer:

I hope that help you

Explanation:

energy is change from one form to another called    _energy conversion

energy can neither be created nor destroyed it can only be transformed from one form to another called --The law of conservation of energy

cause to change in form character or function called - convert

the last sentensce

energy  transformation

Answer:

(a) Cr3+ and Br- will form CrBr3 (chromium(III) bromide)

(b) Fe3+ and O2- will form Fe2O3 (iron(III) oxide)

(c) Hg22+ and CO32- will form Hg2CO3 (mercury(I) carbonate)

(d) Ca2+ and ClO3- will form Ca(ClO3)2 (calcium chlorate)

(e) NH4+ and PO43- will form (NH4)3PO4 (ammonium phosphate)

Explanation:

chatGPT

The chemical formulas for the compounds formed by the given pairs of ions are: (a) CrBr3, (b) Fe2O3, (c) Hg2(CO3)2, (d) Ca(ClO3)2, and (e) (NH4)3PO4.

(a) Cr3+ and Br- : In order to form a neutral compound, the charges of the ions must balance. The charge of Cr3+ is 3+ and the charge of Br- is 1-. To balance the charges, we need three Br- ions for every Cr3+ ion. Therefore, the chemical formula is CrBr3.

(b) Fe3+ and O2- : The charge of Fe3+ is 3+ and the charge of O2- is 2-. To balance the charges, we need two O2- ions for every Fe3+ ion. Therefore, the chemical formula is Fe2O3.

(c) Hg22+ and CO2- : The charge of Hg22+ is 2+ and the charge of CO2- is 2-. The charges are already balanced, so no extra ions are needed. Therefore, the chemical formula is Hg2(CO3)2.

(d) Ca2+ and ClO3- : The charge of Ca2+ is 2+ and the charge of ClO3- is 1-. To balance the charges, we need two ClO3- ions for every Ca2+ ion. Therefore, the chemical formula is Ca(ClO3)2.

(e) NH4+ and PO3- : The charge of NH4+ is 1+ and the charge of PO3- is 3-. To balance the charges, we need three NH4+ ions for every PO3- ion. Therefore, the chemical formula is (NH4)3PO4.

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Answer: A

Explanation:

The Amazon rainforest is maintained by a number of abiotic elements that foster an ecosystem that is highly adaptable to a wide variety of species.

The region's warm, moist climate provides year-round stability that fosters the growth and survival of a wide variety of organisms. With an average annual rainfall of 2,000 to 3,000 millimetres, the area receives abundant rainfall which maintains a steady supply of water for both plants and animals to thrive.

The Amazon's great diversity of vegetation is supported by its excellent soil, which provides a variety of habitats and resources for many species. The terrain of the rainforest, which includes rivers, floodplains and hills, provides a variety of ecological niches that enable the coexistence of many species adapted to different micro-habitats.

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Ionization levels are most highest on the top right side of the Periodic Table. The type of gases that would be in the top right are noble gases, like helium, and other common noble gases.

Hope this answer helps you!

Answer: Earth's crust core contains a large amount of iron and nickel

Explanation:

The dynamo theory proposes a mechanism by which a celestial body such as Earth or a star generates a magnetic field. Earth's crust core contains a large amount of iron and nickel is evidence of the dynamo theory. Dynamo theory proposes a mechanism by which a celestial body such as the Earth or a star generates a magnetic field. The thesis describes how a rotating, convecting, and electrically conducting fluid can maintain a magnetic field over astronomical time scales. In this dynamo mechanism, fluid motion in Earth's outer core moves to execute material (liquid iron) across an already existing weak magnetic field and generates an electric current. (Heat from radioactive decay in the core is thought to induce convective motion.

Answer:

pH = 4.40

Explanation:

The chlorine and sodium atoms in this configuration form a crystal lattice, a crystal structure made up of powerful ionic bonds.

The symmetrical, three-dimensional structural configuration of points representing atoms, ions, or molecules that make up a crystalline solid is known as the crystal lattice.

It can be characterized as the spatial geometrical arrangement of the atoms, ions, or molecules that make up the crystalline solid.

The cubic lattice of rock salt, NaCl, which has half of its lattice points occupied by sodium atoms and half by chlorine atoms, is one of the most prevalent structures.

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The temperature of the reaction should be decreased

This change in temperature would make the equilibrium to shift to the right.

The Le Chatelier's principle, commonly referred to as the Le Chatelier's principle of equilibrium, is a chemical principle that describes how an equilibrium system reacts to environmental changes.

According to this theory, when an equilibrium system is exposed to an outside force, it will respond in a way that partially offsets the imposed change and restore equilibrium.

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Answer: 4,000 grams of NaCI

Explanation:

We know that there are 400g of NaCI in one drop.

This bottle has 10 drops of this item.

So, we have to multiply the amount of NaCI in a drop by the amount of drops.

400 x 10 = 4,000.

The answer to the question is 4,000. Hope this helps!

The frictional force that acts on the body is shown as force D.

We know that the term friction has to do with the force that opposes the motion of a body along a surface. The magnitude of the frictional force is highly dependent on the nature of the surfaces that are in contact with each other.

In this case we have a free body diagram. The meaning of the Freebody diagram is a diagram that show all the forces that acts on a body. In this case, we can see that there are four forces that act on the body and they are the frictionl force, the moving force, the weight of the object and the normal reaction on the objject.

We can see that all the forces that are acting on the body have been labelled with a proper alphabet.

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The wavelength is 4.48 * 10^- 8 m.

Let us recall that the De Broglie idea is that matter has an associated wavelength. This is the so called wave particle duality theory. The sodium atoms also have an associated wavelength.

Now;

1 amu = 1.67 * 10^-27 kg

Relative atomic mass of sodium = 23 amu

Mass of sodium in kilogram = 23 amu *  1.67 * 10^-27 kg

= 3.68 * 10^-26 Kg

Velocity of sodium atoms = 40. cm s-1 or 0.4 ms-1

Thus the de Broglie wavelength;

λ= h/mv

λ= wavelength

h = Plank's constant

m = mass

v = velocity

λ= 6.6 * 10^-34 Js/ 3.68 * 10^-26 Kg *  0.4 ms-1

λ= 4.48 * 10^- 8 m

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Answer:

SnSO₄

Explanation:

Tin(II) sulfate is a chemical compound. It is a white solid that can absorb enough moisture from the air to become fully dissolved, forming an aqueous solution; this property is known as deliquescence.

Answer:

please give me brainlist and follow

Explanation:

SnSO₄