The formula for 1000 g of polyethylene glycol ointment calls for 700 g polyethylene glycol 400. At $1.20 per pint, what is the cost of the polyethylene glycol 400, specific gravity 1.140, needed to prepare 4000 g of the ointment?

Answer:

eon,era, period

Explanation:

Answer:

period<era<eon

Explanation:

I took the test, sadly got a 70%.

When a more complex compound breaks down into two or more simpler compounds, it is known as a decomposition reaction.

What do you mean by complex compound?

In chemistry, a complex compound is a substance that consists of two or more molecules or ions joined together by coordinate covalent bonds. These bonds are formed when one atom donates a pair of electrons to another atom that has an empty orbital. The atom that donates the electron pair is called the donor atom, and the atom that accepts the electron pair is called the acceptor atom.

When a more complex compound breaks down into two or more simpler compounds, it is known as a decomposition reaction. In other words, decomposition reactions involve the breaking down of a larger molecule into smaller molecules or atoms. This type of reaction is the opposite of a synthesis reaction, which involves the combining of two or more simpler compounds to form a more complex compound.

A decomposition reaction can occur through various mechanisms, including thermal decomposition, electrolysis, photolysis, and catalytic decomposition. The specific mechanism depends on the nature of the reactant and the conditions under which the reaction takes place.

Thermal decomposition reactions occur when a substance is heated to a temperature high enough to break its chemical bonds. For example, calcium carbonate decomposes into calcium oxide and carbon dioxide gas when heated:

CaCO3 (s) → CaO (s) + CO2 (g)

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Sugar mixed in water is an example of a solution. Option A

A solution is a homogeneous mixture composed of two or more substances that are evenly dispersed at a molecular level. In this case, sugar (a solute) is dissolved in water (a solvent) to form a sugar-water solution.

When sugar is added to water, the sugar molecules interact with the water molecules through a process called dissolution. The water molecules surround the sugar molecules, forming hydrogen bonds with them and effectively pulling them apart from each other.

As a result, the sugar molecules become evenly dispersed throughout the water, creating a uniform mixture. The sugar molecules do not chemically combine with the water molecules to form a new substance; instead, they remain intact as individual sugar molecules.

The term "molecule" refers to the smallest unit of a substance that retains its chemical properties. Both sugar and water are composed of molecules, but when they mix, they form a solution rather than a single molecule. Therefore, option B) "molecule" is not the correct answer.

Similarly, a compound refers to a substance composed of two or more different elements chemically bonded together. Sugar (C12H22O11) is a compound, and water (H2O) is a compound as well. However, when sugar and water are mixed, they do not chemically react to form a new compound. Instead, they form a solution, making option C) "compound" an incorrect choice.

Finally, a precipitate is a solid that forms when two solutions are mixed and a chemical reaction occurs, leading to the formation of an insoluble compound. In the case of sugar mixed with water, no chemical reaction occurs, and no solid is formed. Therefore, option D) "precipitate" is not the correct answer.

option A

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If the heat capacity of the bomb calorimeter is 9.96 kj/°c, then the amount of heat released from combustion of 2 g of wood is 39.84 kJ.

To determine the amount of heat released from combustion of 2 g of wood, you need to use the formula

Q = C × ΔT Where:Q is the heat released or absorbed in joules (J)C is the heat capacity of the bomb calorimeter (given as 9.96 kJ/°C)ΔT is the change in temperature in degrees Celsius (°C)We can assume that all the heat released from the combustion of the wood is absorbed by the calorimeter, so we can use the heat capacity of the calorimeter to calculate the heat released. Since the calorimeter absorbs the heat, the value of Q will be negative (i.e. the heat is released).

Given: Mass of wood = 2 g Heat capacity of the bomb calorimeter = 9.96 kJ/°C First, we need to calculate the change in temperature. This can be done by measuring the temperature of the calorimeter before and after combustion. Let's assume that the temperature increases by 4.0 °C.ΔT = 4.0 °C Now, we can calculate the heat released: Q = C × ΔTQ = (9.96 kJ/°C) × (4.0 °C)Q = 39.84 kJ

Therefore, the amount of heat released from combustion of 2 g of wood is 39.84 kJ.

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Answer:

The dog ate the bone hiding under the shady tree.

Explanation:

The best observation is that the dog ate the bone hiding under the shady tree. This is because it provides the most graphic details about the position and activities of the dog.

Answer:

The dog ate the bone hiding under the shady tree.

Explanation:

It has the most detail :)

Answer:

Repetition

Explanation:

In the world of science, experiments are regularly conducted to test out hypotheses. These experiments are however, not conducted by scientist once to derive a result. They are rather conducted multiple times (repeated) to ascertain the accuracy i.e not as a result of random occurrence. The experiments that undergo multiple trials are said to undergo REPETITION.

This is the case of the scientist in this question, who is conducting an experiment to test what temperature causes the fastest growth rate in sunflower plants. He conducted the experiment multiple times, making it an example of REPETITION.

N.B: Replication is when the experiment is re-conducted by another scientist to see if same result is derived.

Answer:

The size of the particle has a color effect in Rayleigh scatter, but that is unrelated to your question. In the visible spectrum, the main factor determining the color is electronic transitions in the atoms and molecules which make up the substances.

For very simple compounds, it is relatively easy to determine the absorption bands. The bands could possibly change in solution because the electrical environment of the compound’s molecules could change while in solution with water’s polar molecules. However, in many cases, the bands only change slightly so that a purple crystal for example might remain a purple color in aqueous solution.

Some compounds are very sensitive to ionization and to the pH of the aqueous solution, and for these compounds you may see large color shifts as they go into solution.

There are 725,760 seconds in 1.2 weeks.

To calculate the number of seconds in 1.2 weeks, we need to convert weeks to seconds. Here's the calculation:

1 week = 7 days (there are 7 days in a week)

1 day = 24 hours (there are 24 hours in a day)

1 hour = 60 minutes (there are 60 minutes in an hour)

1 minute = 60 seconds (there are 60 seconds in a minute)

Using these conversion factors, we can calculate the number of seconds in 1.2 weeks:

1.2 weeks × 7 days/week × 24 hours/day × 60 minutes/hour × 60 seconds/minute

= 1.2 × 7 × 24 × 60 × 60 seconds

= 725,760 seconds

Therefore, there are 725,760 seconds in 1.2 weeks.

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Answer:

Magnesium nitride, which possesses the chemical formula Mg3N2, is an inorganic compound of magnesium and nitrogen. Moles H2O = 75.0 grams / 18.02 g/mol. This reaction is used to prove that air contains nitrogen gas. Which equation would have the same coefficients in the same order as 2CO2 + 3H20 → C2H6O + 3O2?

Explanation:

Hopefully this helps :)

Brainiest please I need 5 more

Answer:

yeah im only answering so she can get brainliest

Explanation:

The food chain is the sequence of organisms in an ecosystem where each organism depends on the next as a source of food. For example, a simple food chain in a forest ecosystem could be grass being eaten by a rabbit, which is then eaten by a fox, which may be eaten by a mountain lion.

The trophic level that receives the most energy captured by plants is the primary consumer level (herbivores).

By eating higher up the trophic level, humans are contributing to the reduction of available energy in the ecosystem, as energy is lost at each level due to respiration, heat loss, and waste production. This means that fewer organisms can be supported in higher trophic levels, leading to a reduction in biodiversity.

Most of the energy that enters the trophic level is lost as heat or used by organisms in respiration, growth, and reproduction. Only a small fraction of energy is converted into biomass and passed on to the next trophic level.

Only about 10% of the energy from one trophic level gets passed to another. This is because energy is lost at each trophic level due to heat loss, respiration, and waste production. As a result, there is a limit to the number of trophic levels that can be supported in an ecosystem, as each level receives less and less energy.

Answer:

a food chain is a complex chain or a series of different organisms, depending on the particular food chain, that function in a hierarchy, depending on food source.

The trophic level that most energy captured by plants is the first level of the particular food chain. These are the producers.

By eating her up in the trophic level humans are contributing to loss in certain parts of the food chain, such as decreasing sources of food for organisms who are solely dependent on other organisms.

most of the energy that enters the trophic level is exerted and is mostly not used in terms of food and energy percentage.

10% of energy that is consumed from a food source from an another organism is stored per each trophic level to the next.

Explanation:

brainliest :)

Answer:

34.78% Fe

39.66% Cu

5.48% S

20.07% O

Explanation:

Para resolver esta pregunta debemos hallar la masa de cada átomo en cada mineral. Así, podremos hallar el porcentaje de cada átomo:

Pirita (Fe: 55.845g/mol; S: 32.065g/mol; FeS2: 119.975g/mol)

Masa Fe:

20kg FeS2 * (1*55.845g/mol / 119.975g/mol) = 9.31kg Fe

Masa S:

20kg FeS2 * (2*32.065g/mol / 119.975g/mol) = 10.69kg S

Hemetita (Fe: 55.845g/mol; O: 16g/mol; Fe2O3: 159.688g/mol)

Masa Fe:

70kg Fe2O3 * (2*55.845g/mol / 159.688g/mol) = 48.96kg Fe

Masa O:

70kg Fe2O3 * (3*16g/mol / 159.688g/mol) = 21.04kg O

Calcopirita (Fe: 55.845g/mol; Cu: 63.546g/mol; CuFe2: 175.236 g/mol)

Masa Fe:

15kg CuFe2 * (2*55.845g/mol / 175.236 g/mol) = 9.56kg Fe

Masa Cu:

15kg CuFe2 * (1*63.546g/mol / 175.236 g/mol) = 5.44kg Cu

Tenorita (O: 16g/mol; Cu: 63.546g/mol; CuO: 79.545 g/mol)

Masa O:

90kg CuO * (1*16g/mol / 79.545 g/mol) = 18.10kg O

Masa Cu:

90kg CuO * (1*63.546g/mol / 79.545 g/mol) = 71.90kg Cu

Masa Total: 20kg + 70kg + 15kg + 90kg = 195kg

Porcentaje Hierro:

9.31kg Fe + 48.96kg Fe + 9.56kg Fe / 195kg * 100 =

34.78% Fe

Porcentaje Cobre:

5.44kg Cu + 71.90kg Cu / 195kg * 100 =

39.66% Cu

Porcentaje Azufre:

10.69kg S / 195kg * 100 =

5.48% S

Porcentaje Oxígeno:

21.04kg O + 18.10kg O/ 195kg * 100 =

20.07% O

Answer:

Hydrogen is the first element in the periodic table. Oxygen is the eighth element in the periodic table.

Both elements are gases.

Hydrogen is used for the Haber process and rocket fuel.

Oxygen is used for breathing and production purposes.

Air composes 21% oxygen and 0.0001% hydrogen.

Water is an example that contains both hydrogen H2 and oxygen O2 molecules.

Answer:

Hydrogen is the chemical element with the Symbol H and atomic number 1.

Hydrogen is the lightest element in the periodic table and it is the most abundant in the universe.

                                                 WHILE:

Oxygen is the chemical element with the symbol O and the atomic number 8.

It is a member of the chalcogen group in the periodic table.

This is what we humans take in to breathe that gives us life.

Answer:

The answer is 0.025576559594663

Answer:

NaNO3

balanced equation - Na2CO3 + Sn(NO3)2 → 2NaNO3 + Sn(CO3)

Reference table F lists the solubility of various compounds in water at 25°C. According to the table, the solubility of silver iodide in water is 1.5 x 10⁻³ grams per 100 grams of water.

This means that at 25°C, 1.5 x 10⁻³ grams of silver iodide will dissolve in 100 grams of water.

Silver iodide is a sparingly soluble compound, which means that it has low solubility in water. This is due to the ionic nature of silver iodide, which results in strong attractive forces between the ions in the solid form.

As a result, only a small amount of silver iodide can dissolve in water, even at high temperatures. This low solubility has important implications for the use of silver iodide in various applications, including photography and cloud seeding.

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Among the options provided, the correct formula and chemical name combination is:

PCI₂ represents phosphorus tetrachloride. The other combinations listed are not correct:

C D Q Zoom X N₂O₂ is not a valid chemical formula or name combination.

N₂O is dinitrogen monoxide (commonly known as nitrous oxide), not dinitrogen pentoxide.

Ca₂P represents calcium phosphide, not dicalcium diphosphide.

Therefore, the correct combination is PCI₂, which stands for phosphorus tetrachloride.

Phosphorus tetrachloride (PCI₂) is a chemical compound composed of one phosphorus atom bonded to two chlorine atoms. It is a colorless, toxic, and reactive liquid with a pungent odor. PCI₂ is commonly used as a precursor in various chemical reactions and synthesis processes.

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The formation of solid magnesium chloride (MgCl₂) by the reaction between chlorine gas (Cl₂) and magnesium metal (Mg) at high temperatures is classified as a synthesis reaction or a combination reaction.

Synthesis reactions involve the combination of two or more substances to form a single product. In this case, chlorine gas and magnesium metal combine to produce magnesium chloride as the sole product.

The balanced chemical equation for this synthesis reaction is:

Mg + Cl₂ ⇒ MgCl₂

Hence, the reaction between chlorine gas and magnesium metal to form solid magnesium chloride indicates a synthesis reaction, as the elements combine to form a compound.

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Electrons are said to be delocalized electrons

Delocalized electrons are electrons in a molecule, ion, or solid metal that are not associated with a single atom or covalent connection. Electrons that have been delocalized are trapped within an orbital that spans many neighboring atoms.

Because electrons can freely roam within these molecular orbitals, each electron becomes separated from its parent atom. Delocalization refers to electrons. The strong forces of attraction between the positive nuclei and the delocalized electrons hold the metal together.

As a result, in a metallic link, electrons are free to flow freely from one atom to the next across the metal and are not bound to a specific atom; these electrons are referred to as delocalized electrons.

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All the units listed in the question can be valid units for a reaction rate, except for the unit of grams per second (g/s). Reaction rate is defined as the change in concentration of a reactant or product per unit time. It is usually expressed in units of mol/L-time, where time can be in seconds, minutes, or hours.

The unit of M/s (molarity per second) is often used for expressing the reaction rate, especially in kinetics studies. The unit of mol/L-hr (molarity per hour) is also a valid unit for expressing the reaction rate, as it represents the change in concentration per unit time.

The units of mol/hr (moles per hour) and mol/L (molarity) are also used to express the reaction rate. However, the unit of g/s is not a valid unit for a reaction rate, as it represents the mass of a substance per unit time, rather than the change in concentration per unit time.

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Answer:

A open system

I think plz tell me if i'm wrong

Explanation:

Answer:

A- an Open System

Explanation:

Explanation:

The boiling point of a pure substance is the temperature at which the substance transitions from a liquid to the gaseous phase. At this point, the vapor pressure of the liquid is equal to the applied pressure on the liquid.

Ionic compounds are formed by the complete transfer of electrons from more electronegative elements to less electronegative elements.

7. Sodium Nitride (Na₃N) is an ionic substance.

8. The ionic formula for Lithium Oxide is Li₂O

9. The compound SrF₂

10. Aluminum Sulfide is a chemical compound with the formula Al₂S₃.

An ionic compound is a chemical compound composed of ions held together via electrostatic forces termed ionic bonding. The compound is neutral standard but includes definitely charged ions known as cations and negatively charged ions known as anions.

An ionic compound is a chemical compound composed of ions held collectively by means of electrostatic forces termed ionic bonding. The compound is neutral normal however consists of positively charged ions known as cations and negatively charged ions referred to as anions. Ionic compounds incorporate ions and are held collectively via the attractive forces of most of the oppositely charged ions.

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The mass of "Be (beryllium-7) in the reaction 1²H +³ He → "Be is approximately 7.0154 atomic mass units (u).

To find the mass of "Be (Beryllium-7) in the reaction 1²H +³ He → "Be, we can use the Q value of the reaction and the known masses of the isotopes involved.

It can be calculated using the equation;

Q = (m_initial - m_final) × c²

Where;

Q = Q value of the reaction

m_initial = total initial mass of the reactants

m_final = total final mass of the products

c = speed of light

In this case, the Q value for the reaction 1²H +³ He → "Be is given as 559.5 ± 0.4 keV.

Now, we need to determine the masses of the isotopes involved;

Mass of 1²H (deuterium) = 2.014102 u (atomic mass units)

Mass of ³ He (helium-3) = 3.016029 u

Mass of "Be (beryllium-7) = ?

Let's denote the mass of "Be as m_"Be.

Using the equation for the Q value, we can rearrange it to solve for the mass of "Beryllium

m_"Be = (Q/c²) + m_initial - m_final

m_"Be = (559.5 keV / (2.998 × 10⁸ m/s)²) + (2.014102 u + 3.016029 u) - m_"Be

Simplifying the equation, we have;

m_"Be = (559.5 × 10³ eV) / (8.98755 × 10¹⁶ m²/s²) + 5.030131 u - m_"Be

Rearranging the equation and solving for m_"Be:

2m_"Be = (559.5 × 10³ eV) / (8.98755 × 10¹⁶ m²/s²) + 5.030131 u

m_"Be = [(559.5 × 10³ eV) / (8.98755 × 10¹⁶ m²/s²) + 5.030131 u] / 2

Calculating the expression in the brackets:

m_"Be ≈ 7.0154 u

Therefore, the mass of "Be (beryllium-7) in the reaction 1²H +³ He → "Be is approximately 7.0154 atomic mass units (u).

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--The given question is incorrect, the correct question is

"B decay. Find several examples to verify your derived relationship. 6. The Q value for the reaction "Be (p. d) Be is 559.5 ± 0.4 keV. Use this value along with the accurately known masses of "Be. H. and ¹H to find the mass of "Be. 1²H +³ He."--

Answer

Explanation

In the oxidation number method of balancing chemical equations, you determine the oxidation numbers of all atoms. Then you multiply the atoms that have changed by small whole numbers. You are making the total loss of electrons equal to the total gain of electrons. Then you balance the rest of the atoms.

The given equation is:

Ag + H₂S + O₂ —> Ag₂S + H₂O

Step 1. Identify the atoms that change oxidation number.

Left hand side: Ag = 0, H = +1, S = -2, O = 0

Right hand side: Ag = +1, S = -2, H = +1, and O = -2

The changes in oxidation number are:

Ag: 0 → +1; Change = +1

O: 0 → -2; Change = -2

Step 2. Equalize the changes in oxidation number.

Each Ag atom has lost one electron, and each O atom has gained two electrons.

O: 0 → -2; Change = -2,

The initial concentration of acid ha in solution is 2.0 m. if the ph of the solution at equilibrium is 2.2, the percent ionization of the acid is 0.3 %.

To calculate the percent ionization of the acid we are using the formula,

The H⁺ ion concentration [H⁺] = C x,

where, we are given,

C= concentration of the acid.

=2 M

x= degree of dissociation of the acid.

And one more thing we are given that, the pH of the acid=2.2

So from the above statement we can say that,

pH = - log [H⁺]

Or, 2.2= -log [H⁺]

Or, log [H⁺] = -2.2

Or, [H⁺] = antilog -2.2

Or,[H⁺]=0.00631

Now from the above calculation we know, the H⁺ ion concentration= 0.00631 M.

Now we put the known values in the above equation,

[H+]= Cx

Or,0.00631 = 2 x

Or, x= 0.003155

From the above calculation we can conclude that the percent Ionization of the acid= 0.003155 X 100= 0.315= 0.3%

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Yes, it is necessary to be careful when adding too much additional chromate during the strontium test. Excessive amounts of chromate can form a precipitate with strontium ions, leading to the formation of strontium chromate.

This can interfere with the accurate detection and measurement of strontium. Strontium chromate is a yellow solid that can precipitate out of the solution, making it difficult to distinguish and quantify the presence of strontium. This interferes with the accuracy and reliability of the strontium test. Therefore, it is important to use the appropriate amount of chromate in the test to ensure that the reaction specifically targets the barium ions without affecting the strontium ions.

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During the melting of ice, the ice absorbs heat energy and the molecules move further away; option A.

Melting refers to the process by which a solid substance changes to liquid when heat is added to it.

The melting of pure substances occur at a definite temperature called the melting point of that substance.

The molecules of a substance move further apart when they melt as the attractive forces between them are weakened.

The melting of ice is an example of the process of melting.

During the melting of ice, the ice absorbs heat energy and the molecules move further away.

In conclusion, melting of solids occur when heat is added to the solid.

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In the context of atomic orbital (AO) wavefunctions, the terms "radial node" and "nodal plane" refer to different aspects of the wavefunction's behavior.

A radial node is a region in the AO wavefunction where the probability of finding an electron is zero along the radial direction. In other words, it represents a spherical shell where the electron is unlikely to be found. The number of radial nodes is determined by the principal quantum number (n) of the orbital. For example, the 2s orbital has one radial node, while the 2p orbital has no radial nodes.

On the other hand, a nodal plane is a flat plane within the AO wavefunction where the probability of finding an electron is zero along a particular direction. It represents a surface that divides the orbital into two regions of opposite phases. The number of nodal planes is determined by the angular quantum numbers (l and m) of the orbital. For example, the 2s orbital has no nodal planes, while the 2p orbital has one nodal plane (the xz or yz plane).

Radial nodes arise from the radial part of the wavefunction because they depend on the distance from the nucleus. The radial part determines the distribution of the electron density as a function of distance, and the nodes correspond to regions where the density drops to zero.

On the other hand, nodal planes arise from the angular part of the wavefunction because they depend on the orientation and shape of the orbital. The angular part describes the angular distribution of the electron density around the nucleus, and the nodal planes correspond to regions where the phase of the wavefunction changes sign.

In summary, radial nodes are related to the distance from the nucleus and arise from the radial part of the wavefunction, while nodal planes are related to the orientation and shape of the orbital and arise from the angular part of the wavefunction. The 2s orbital has one radial node and no nodal planes, while the 2p orbital has no radial nodes and one nodal plane.

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Valence Electrons are The number of electrons in the outer most shell of an atom. These shells have a maximum amount before being filled by electrons, in which remaining electrons will fill the next remaining valence shell.