If a catalyst is added to a system, the temperature and the pressure remain constant, there would be no effect on the?

A. activation energy of the reaction
B. rate of the reaction
C. rate of the reverse reaction
D. heat of reaction

In a liter of 0.15 M \(CaCl\)₂, there are 0.15 moles of \(CaCl\)₂. Calculating it in grams.

1 mole \(CaCl\)₂ = 110.98 g

16.65 g \(CaCl\)₂ in 1 liter from 0.15 moles \(CaCl\)₂ x 110.98 g/mole

So, it needs \(CaCl\)₂—54 g—in liters (or milliliters)

3.24 L or 3240 ml is equal to 16.65 g/L or 54 g/L.

Alternatively put:

You get 54 g of \(CaCl\)₂ converted to moles.

54 g x 1 mole/110.98 g = 0.487 moles of \(CaCl\)₂ in 3.24 L, or 3240 ml of solution.

According to the chemical formula for \(CaCl\)₂, there are two moles of \(Cl_{1} -\)and one mole each of the total ions \(Ca_{2}+\) and \(Cl_{1} -\) in every mole of the molecule.

The amount of solute that dissolves in one liter of solution is measured by a substance's molarity (M). Divide the number of moles of solute by the liters of solution volume to determine the molarity of a solution: Molarity (M) = moles of solute/liters of solution = molL.

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Answer:

Water level (m)

Explanation:

I had it on a quiz and got it right

The most likely thing to be input in a software is water level(m).

Hydroelectricity is a type of renewable energy that produces electricity by harnessing the force of moving water.

Hydroelectric energy, also known as hydroelectric power or hydroelectricity, is a type of energy that uses the force of moving water to produce electricity, such as water running down a waterfall.

There are three basic kinds of hydroelectric generating plants, with impoundment facilities being the most prevalent. A dam is used in an impoundment facility to regulate the flow of water stocked in a pool or reservoir. Water level would most likely be the input value in software.

Therefore, The most likely thing to be input in a software is water level(m).

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Answer: c

Explanation: built different

While the circular portion of this solar eclipse is not visible in Quito, a partial solar eclipse can be seen there.

A partial eclipse happens when the Sun and Moon are only partly blocked from Earth's view by the Moon. Typically, a sizable portion of the planet's surface outside of an annular or complete eclipse can observe this occurrence.

However, because the umbra travels above the polar areas of the Earth and never touches the Earth's surface, some eclipses can only be seen as partial eclipses. Since it requires well over 90% coverage to observe any dimming of the Sun's brightness, partial eclipses are essentially undetectable. It wouldn't be any dimmer than civil dusk even at 99%.

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The Beilstein test is a test for halogens, which identifies the presence of halogens in an organic compound. The test is based on the observation that halogen atoms produce a green flame when a compound containing halogens is introduced into a flame.

Of the halogens in the halogen family (fluorine, chlorine, bromine, and iodine), fluorine is the halogen that would not produce a positive Beilstein test result. This is because fluorine is so reactive that it will react with the copper wire used in the test, preventing the green flame from being produced. In contrast, chlorine, bromine, and iodine will react with the copper wire to produce a green flame, indicating the presence of halogens in the compound being tested.

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Answer:

The cyclist must be fed in order to continue to pedal because food will. provide him/her with energy to continue with it.

Answer:167.9 g Ag

Explanation: 1 mol Cu + 2 mol AgNO3 = 2 mol Ag + 1 mol Cu(NO3)2

63.55 g Cu —> 2*107.688 g Ag

So 49.1 g Cu —> (49.1/63.55)*2*107.688 = 167.9 g Ag

Answer:

the correct answer is B. far left

Explanation:

i just got it right on edge 2020 :p

TLDR: They should be the same by the conservation law of masses.

Now it may appear as if they changed if one of the resulting products is in the form of a gas or another hard to examine and weigh. In those situations it may seem that the masses will change, but the ratio should remain constant. Try looking up 3.7: Conservation of Mass - There is No New Matter on ChemLibre for more information on this topic that goes more into depth about it.

If AgNO3 and NaOH are combined in a chemical reaction, the addition of the individual weights of the reactants must be equal to that of the compounds formed after the reaction.

Recall:

Looking at the equation of the reaction:

There is no evolution of gas in the reaction. Hence, if a scale was used to find the mass of AgNO3 and NaOH before the reaction, the addition of the masses must be equal to the total mass of the compounds formed from the reaction.

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Answer:

1.85 g per cm^3

The substance is Beryllium(if it is a single element, and not a compound)

Explanation:

Answer:

+1

Explanation:

Sodium has one electron in its outermost shell. Sodium can not be able to accept seven electrons because the energy required for that process is very high. Sodium would rather loose its only valence electron to form a univalent positive ion Na^+.

This is an easier process. When sodium looses one electron, it now has a charge of +1.

Acetic acid is the by product of production of aspirin. Aspirin crystals are formed after the acetic acid is removed through filtration of the acetic acid-water solution. Recrystallization from an ethanol/water solvent pair removes any trace levels of salicylic that are still present.

Acetylsalicylic acid (ASA), generally known as aspirin, is a nonsteroidal anti-inflammatory medication (NSAID) used to treat inflammation, fever, and/or pain as well as a blood thinner. Aspirin is used to treat a variety of inflammatory disorders, including Kawasaki disease, pericarditis, and rheumatic fever. 

Long-term usage of aspirin is also used to help those at high risk avoid further heart attacks, ischemic strokes, and blood clots.

The effects of pain or fever usually start to take effect after 30 minutes. While aspirin functions similarly to other NSAIDs, it also inhibits platelets' natural function.

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Answer:

\(\Large \boxed{\mathrm{A}}\)

Explanation:

Rust formed from iron and oxygen combining is a chemical change, because in a chemical change, the resulting substance(s) will have different properties from the substance(s) before the chemical change.

I cant comment... So is it Right?

When EROEI (Energy Return on Energy Investment) is equal to 1, it means that the energy gained from a particular source is equivalent to the energy invested in obtaining that energy. In other words, the energy return is equal to the energy input. This indicates a situation where the energy extraction process is barely breaking even, with no net gain or loss in energy.

EROEI is a metric used to assess the efficiency and viability of energy sources. It measures the amount of usable energy obtained from a particular energy source divided by the amount of energy invested to extract or produce that energy. A value of 1 means that the energy gained is just enough to offset the energy invested.

In practical terms, an EROEI of 1 implies that the energy source being evaluated is not very efficient. It suggests that the amount of energy required to extract, process, or produce the energy is nearly equal to the energy obtained. Therefore, there is little to no surplus energy available for other uses or to sustain the energy extraction process itself.

An EROEI of 1 is often associated with energy sources in their early stages of development or exploration, where the technology or extraction methods may not be fully optimized. It could also indicate energy sources with high production costs or low energy density.

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Sort the atoms in order of proximity to one another. The atom with the lowest group number should be positioned in the middle since it has the lowest electronegativity. If the group number of two atoms is the same

Of Lewis structures, the valence electrons of the atoms in a molecule are shown. They are also known as electron dot structures or Lewis dot structures.

The valence electrons of atoms and molecules are easier to visualize using these Lewis symbols and structures. An extremely simplified representation of a molecule's valence shell electrons is provided by a Lewis Structure. It serves to illustrate how certain atoms are surrounded by electrons in a molecule.

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Propane gas does pose a greater risk of fire than methane. Propane and methane are both hydrocarbon gases commonly used as fuels. The difference lies in their properties and characteristics that affect their flammability.

Propane (C3H8) has a higher energy content and a lower ignition energy compared to methane (CH4). This means that propane is more easily ignited and has a higher heat release rate when burned. Propane has a wider flammable range (2.4%-9.6% volume in air) compared to methane (5%-15% volume in air), making it more susceptible to combustion over a broader range of gas-to-air ratios.

Additionally, propane has a higher vapor density than air, which means that leaked propane gas tends to sink and accumulate in low-lying areas, increasing the risk of ignition and explosion. Methane, on the other hand, is lighter than air and tends to dissipate more rapidly.

However, it is important to note that both propane and methane can pose fire risks if mishandled or in the presence of an ignition source. Proper storage, handling, and ventilation are crucial to mitigate the fire hazards associated with any flammable gas.

In summary, due to its higher energy content, lower ignition energy, wider flammable range, and higher vapor density, propane gas generally poses a greater risk of fire compared to methane.

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\(125 ml\) of normal saline is needed to prepare 2.5 g of Penicillin.

\(2.5 g\)

Penicillin, also known chemically as benzylpenicillin or penicillin G, is an antibiotic used to treat and prevent bacterial infections. It works by inhibiting the growth of bacteria by disrupting the formation of their cell walls.

To calculate the amount of normal saline needed to prepare the prescribed amount of Penicillin, we can use the following equation:

\(\frac{(Prescribed amount of Penicillin) }{(Amount of Penicillin in the 5 g vial)} = (Amount of normal saline needed)\)

In this case: \(\frac{ (2.5 g) }{(5 g) }= (0.5)\)

Since the instructions say to reconstitute with 250 ml of normal saline, we can multiply 0.5 by 250 ml to get the amount of normal saline needed to prepare the prescribed amount of Penicillin:

\(0.5 * 250 ml = 125 ml\)

Therefore, 125 ml of normal saline is needed to prepare 2.5 g of Penicillin.

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complete quetsion:The doctor orders Penicillin 2.5 g. Instructions on the 5 g vial say to reconstitute with 250 ml of normal saline. How many milliliters will prepare the ordered amount?*

A. 125 ml/dose

B. 20 ml/dose

C. 10 ml/dose

D. 100 ml/dose

The mole fraction of N₂ in the mixture, given the data is 0.225

Density = mass / volume

Cross multiply

Mass = Density × volume

Mass of mixture = 2.063 × 22.4

Mass of mixture = 46.2112 g

We'll begin by calculating the mole of N₂ in the mixture. This can be obtained as follow:

Total mole = Mole of N₂ + Mole of Cl₂ + Mole of O₂

1 = x + y + y

1 = x + 2y

2y = 1 - x

y = (1 - x) / 2

Mass of mixture = mass of N₂ + mass of Cl₂ + mass of O₂

Recall

mass = mole × molar mass

Thus,

Mass of mixture = (mole of N₂ × molar mass) + (mole of Cl₂ × molar mass) + (mole of O₂ × molar mass)

46.2112 = 28x + 71y + 32y

But

y = (1 - x) / 2

46.2112 = 28x + 71(1 - x) / 2 + 32(1 - x) / 2

Multiply through by 2

92.4224 = 56x + 71(1 - x) + 32(1 - x)

92.4224 = 56x + 71 - 71x + 32 - 32x

Collect like terms

92.4224 - 71 - 32 = 56x - 71x - 32x

-10.5776 = -47x

Divide both sides by -47

x = -10.5776 / -47

x = 0.225 mole

Finally, we can determine the mole fraction of N₂. This can be obtained as follow:

Mole fraction = mole / total mole

Mole fraction of N₂ = 0.225 / 1

Mole fraction of N₂ = 0.225

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The net equation for the synthesis for the biosynthesis of palmitate(16-carbon fatty acid) in rat liver, starting from mitochondrial acetyl-CoA and cytosolic NADPH, ATP, and CO2:

8 Acetyl CoA (2C)  + 14 NADPH + 13H+ + 7 ATP→ Palmitate (16C) + 8 CoA-SH + 6 H2O + 14 NADP+ + 7 ADP + 7 Pi

In this equation, 8 acetyl-CoA molecules are used, along with 14 NADPH, 7 ATP,  to produce 1 molecule of palmitate. Additionally, 14 NADP+, 8 CoA, 6 H2O, 7 ADP, and 7 Pi molecules are generated as byproducts during the fatty acid synthesis process.

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Yes. Solubility is 0.070 kg/L

Solution:

Solubility = mass / Volume

Solubility = (0.210kg)/(3L) = 0.070 kg/L

Solubility is defined as the maximum amount of a substance that will dissolve in a specified amount of solvent at a specified temperature. Solubility is a characteristic property of a particular solute/solvent combination, and different substances have very different solubilities.

Adding sugar cubes to your tea or coffee is a common example of a solution. The ability of a sugar molecule to dissolve easily is called solubility. The term solubility can therefore be defined as the property of a substance to dissolve in a particular solvent. Water solubility is a measure of the amount of a chemical that can be dissolved in water at a given temperature.

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Answer:

Mass, m = 19466.7 kg

Explanation:

Given that,

Portland cement concrete (PCC) has a density of 150 lb/ft³

We need to find how many kilograms of PCC are required to cast a cylindrical column 1.15 m in diameter and 7.8 m in height.

Since, 1 kg = 2.205 lb

1 lb/ft³ = 16.018 kg/m³

150 lb/ft³ = 2402.77 kg/m³

Density, \(d=\dfrac{m}{V}\)

m is mass of PCC in kg and V is volume of cylinder

\(m=d\times V\)

\(m=d\times \pi r^2 h\\\\m=2402.77\times \pi \times (1.15/2)^2\times 7.8\\\\m=19466.70\ kg\)

So, the mass of PCC required is 19466.7 kg.

The concentration of the koh solution content loaded when 15.00 ml of 0.500 m h2so4 is titrated with 17.70 ml of potassium hydroxide is 0.848 M (Approx.)

To determine the concentration of the KOH solution when 15.00 mL of 0.500 M H2SO4 is titrated with 17.70 mL of potassium hydroxide, follow these steps:

1. Write the balanced chemical equation: H2SO4 + 2KOH -> K2SO4 + 2H2O

2. Calculate the moles of H2SO4: moles = Molarity × Volume (in liters)
moles_H2SO4 = 0.500 M × 15.00 mL × (1 L / 1000 mL) = 0.0075 moles

3. Determine the moles of KOH: From the balanced equation, 1 mole of H2SO4 reacts with 2 moles of KOH, so
moles_KOH = 2 × moles_H2SO4 = 2 × 0.0075 moles = 0.015 moles

4. Calculate the concentration of KOH: Molarity = moles / Volume (in liters)
M_KOH = 0.015 moles / (17.70 mL × (1 L / 1000 mL)) ≈ 0.848 M

So, by calculating, the concentration of the solution results in approximately 0.848 M.

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In a molecule with the formula AB3 and a trigonal pyramidal geometry, the central atom, A, is bonded to three other atoms, B. To determine the number of lone pairs on the central atom, we need to consider the valence electrons of the central atom and the total number of electrons around it.

The central atom, A, typically follows the octet rule, which means it prefers to have eight electrons in its valence shell. To determine the number of lone pairs, we subtract the number of bonded electrons from the total number of valence electrons.

For an atom in group 3A (such as Boron or Aluminum), it typically has three valence electrons. If A is in group 5A (such as Nitrogen or Phosphorus), it would have five valence electrons.

Since the molecule has a trigonal pyramidal geometry, we can infer that there is one lone pair on the central atom, A. The three bonded pairs of electrons (forming the AB3 part) and the lone pair give the molecule its trigonal pyramidal shape.

Therefore, in the molecule AB3 with a trigonal pyramidal geometry, the central atom, A, has one lone pair.

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your anwser would be 342 gmol  Please mark branliest

Just get out that Periodic Table of the Elements, find the atomic masses for each atom, and add them up!

Carbon = 12

Hydrogen = 1

Oxygen = 16

C=12×12=144

H=1×22=22

O=16×11=176

Sucrose =144+22+176=342gmol

An intensive property is the physical characteristics that have an independent magnitude. The thermometer can be used to measure the temperature. Thus, option C is correct.

An intensive property has been constituted of the parameters that are not dependent on the size and the mass of the sample. Density, pressure, and temperature are some intensive properties.

The first image shows a weighing balance, the second shows a volumetric cylinder, and the fourth shows a ruler used to measure mass, volume, and length respectively, which are extensive properties.

Therefore, option C. thermometer measures temperature, which is an intensive property.

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Answer:

Chemical potential energy is a form of potential energy related to the structural arrangement of atoms or molecules. This arrangement may be the result of chemical bonds within a molecule or otherwise. Chemical energy of a chemical substance can be transformed to other forms of energy by a chemical reaction.

The chemical energy and nuclear energy can be considered potential energy because both of them has energy stored in it.

Potential energy is any form of energy that has stored potential that can be put to future use such as nuclear energy, chemical energy in which the energy is stored in it so we can conclude that chemical energy and nuclear energy can be considered potential energy due to its storage of energy.

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Answer:

Yellow

Explanation:

Thymol blue has a brownish-green or reddish-brown color and is a good pH indicator. It changes from red to yellow at a pH 1.2–2.8 ( acidic) and then from yellow to blue at a pH of 8.0–9.6( alkaline).

Nitric acid is a strong acid which means the pH indicator will change to yellow.

The structure of the nitrile that would give the carboxylic acid is a carbon atom triple bonded to a nitrogen atom and single bonded to an alkyl or aryl group. This structure is known as a nitrile group and is represented by the formula -C≡N. The nitrile precursor is the compound that contains this nitrile group and is used to synthesize the carboxylic acid.

For example, if the carboxylic acid is acetic acid (CH3COOH), then the nitrile precursor would be ethanenitrile (CH3CN). The nitrile group in ethanenitrile can be hydrolyzed to form the carboxylic acid group in acetic acid.

In general, the nitrile precursor for a carboxylic acid can be identified by removing the -COOH group from the carboxylic acid and replacing it with a -CN group. This will give the structure of the nitrile precursor that can be used to synthesize the carboxylic acid.

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The most likely pH at the equivalence point of the titration of a weak acid with a strong base would be option b, pH of 7. The equivalence point of a titration is the point at which equal moles of acid and base have reacted.

In the titration of a weak acid with a strong base, the strong base will react with the weak acid to form a salt and water. At the equivalence point, all of the weak acid will have reacted with the strong base to form the salt of the weak acid.

The pH at the equivalence point of the titration of a weak acid with a strong base will depend on the pKa of the weak acid. If the pKa of the weak acid is less than 7, then the pH at the equivalence point will be greater than 7 (option c). If the pKa of the weak acid is greater than 7, then the pH at the equivalence point will be less than 7 (option b). If the pKa of the weak acid is equal to 7, then the pH at the equivalence point will be equal to 7 (option b).

Therefore, we cannot determine the exact pH at the equivalence point without knowing the pKa of the weak acid. However, based on the options given, the most likely pH at the equivalence point of the titration of a weak acid with a strong base would be option b, pH of 7.

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