A cube with a mass of 250. 0 g has sides measuring 5. 00 cm each. What is the density of this cube in grams per cubic centimeter?

The balanced reaction equation is;

\(2LiI + Pb(NO_{3} )_{2} --- > 2LiNO_{3} + PbI_{2}\) as we can see from the equation that is written here.

In the balancing of the reaction equation, we have to make sure that the number of the reacting atoms on the reactant and the product side are the same for each of the elements.

On both sides of the equation, tally the atoms of each element. First, balance the polyatomic ion or the most complicated molecule. One element at a time, balance the other atoms of the reactants and products. Make sure that every atom is now evenly distributed on both sides of the equation.

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Answer:

All living cells release energy from food  molecules through cellular breathing and/or fermentation. Some cells make food molecules using light energy through the process of (making food from light).

Making food from light- Photosynthesis

Breathing- Respiration

All living units give out power for a given time from food small complex units through formed of small units breathing and or fermentation. Some units make food small complex units using light power for a given time through the process of (making food from light).

Answer:

When 3.85 moles of HCl react with excess aluminum, the balanced equation is as follows:

2Al + 6HCl → 2AlCl3 + 3H2

To solve for the number of moles of H2 gas released, we can use a conversion factor that multiplies the number of moles of HCl by the coefficient for H2 on the product side (3).

3.85 moles of HCl x (3 moles of H2 / 6 moles of HCl) = 2.9 moles of H2

Therefore, when 3.85 moles of HCl react with excess aluminum, 2.9 moles of H2 gas are released.

The percentage of O2 will react is 0.97%.

The rate of reaction at equilibrium is determined by the equilibrium constant (Kc) value; that is, the higher the Kc value, the more products are formed. Kc is calculated by taking the ratio of product and reactant concentrations at equilibrium.

The chemical equation is N2 (g)+O2 (g)⇋2NO (g)

The reaction's equilibrium constant is Kc = 4.10104.

The solution contains 0.867 mol of N2 and 0.867 mol of O2.

The container has a volume of V=0.769L.

The initial concentration of

N2 = 0.967/0.769 M = 1.13 M

O2 = 0.867/0.769 M = 1.3 M

For the table, refer image

Now we write this same reaction's equilibrium constant expression.

\(K_{c} = \frac{[NO]^{2} }{[N_{2} ] . [O_{2} ]} \\\\4.10 * 10^{-4} = \frac{(2y)^{2}}{(1.13 - y) . (1.13 - y)} \\\\1.277 - 2.26y + y^{2} = 9756y^{2} \\\\9755y^{2} + 2.26y - 1.277 = 0\\\)

     y = 0.011 M

So,

Now we know that the amount of O2 reacting is y = 0.011 M

and the percentage is 0.011/1.13 * 100%

                                                      = 0.97%

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Then 2520 ounces of solution z contains ounces of a is 876 ounces.

given that ;

x contains a and b in the ratio = 2:3

y contains a and b in the ratio = 1:2

z contains the a and b in the ratio 3:11, that, means in 14 parts of solution.

therefore, 2520 ounces solution of z,

x = ( 2520 × 3 ) / 14 = 540

y =  ( 2520 × 11 ) / 14 = 1980

x = 540 (2/5) = 216

y = 1980 / 3 = 660

thus, One ounce of solution x contains only ingredients a and b in a ratio of 2:3. One ounce of solution y contains only ingredients a and b in a ratio of 1:2. If solution z is created by mixing solutions x and y in a ratio of 3:11, then 2520 the ounces of solution of z = 876

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The mass of the glass is 1 gram.

What is specific heat capacity?

 This refers to the amount of heat in joules (J) absorbed per unit mass (kg) of the material when its temperature rises 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).

From the question:

cp= 0.20 cal/(g°C)

T = 150°C

heat added = 30 cal

To find the mass of the glass, you can use the formula:

mass = heat added / (specific heat capacity x temperature change)

Substituting the given values:

mass =           30 cal

              (0.20 cal/(g°C) x 150°C)

mass =             30

                 (0.20 x 150)

mass       = 30

                  30

mass = 1 g

Hence, the mass of the glass is 1 gram.

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Explanation:

(1) The mechanism of the reaction between propene and hydrogen bromide to give 2-bromopropane is as follows:

Protonation of the alkene: A proton from hydrogen bromide (HBr) attacks the alkene, forming a carbocation intermediate.

Bromine addition: Bromine (Br) adds to the carbocation intermediate to form an intermediate bromonium ion.

Deprotonation: A proton from the bromonium ion is removed by a water molecule or another molecule, producing the final product 2-bromopropane.

The mechanism can be represented using curly arrows as follows:

H,C

H

c=c

H

H

H-Br

CH, H

H-C-C-H

Br H

CH, H

1 1

H-C-C-H

Br H

2-bromopropane

(2) 2-bromopropane is the main product of this reaction because of the stereochemistry of the reaction. When the carbocation intermediate forms, the bromine atom has a preference for adding to the face of the alkene that has the least number of hydrogen atoms. This leads to the formation of the 2-bromopropane, which has the bromine atom attached to the carbon atom with two hydrogen atoms. On the other hand, the formation of 1-bromopropane, which has the bromine atom attached to the carbon atom with three hydrogen atoms, is less favorable. This is why 2-bromopropane is the main product of this reaction.

Water molecules have a stronger attraction than helium due to the presence of dipole-dipole interactions resulting from the polarity of the water molecule.

Water molecules have a stronger attraction than helium due to the difference in their intermolecular forces. Intermolecular forces are the attractive forces that exist between molecules and play a crucial role in determining the physical properties of substances.

Water molecules have a polar nature, meaning they have a partial positive charge on the hydrogen atoms and a partial negative charge on the oxygen atom.

This polarity arises from the unequal sharing of electrons in the O-H bonds due to oxygen's higher electronegativity compared to hydrogen. The presence of polar bonds within the water molecule gives rise to a dipole-dipole interaction.

In contrast, helium is a noble gas and exists as individual atoms. Helium atoms are electrically neutral and do not possess a permanent dipole moment.

As a result, helium exhibits weak intermolecular forces known as London dispersion forces or Van der Waals forces. These forces arise due to temporary fluctuations in electron distribution, causing temporary dipoles that induce dipoles in neighboring atoms or molecules.

The dipole-dipole interaction in water is stronger than the London dispersion forces in helium. This is because dipole-dipole forces are more significant when there are permanent dipoles in the molecules.

The stronger attraction between water molecules leads to higher boiling and melting points compared to helium.

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2 moles of Zn are produced when 2 moles of hydrogen react in the given reaction: \(Zn + 2HCl\)  → \(ZnCl_2 + H_2\)

The balanced chemical equation for the reaction between zinc (Zn) and hydrochloric acid (HCl) is:

\(Zn + 2HCl\) → \(ZnCl_2 + H_2\)

Therefore, if 2 moles of \(H_2\) are produced, we can work backward to determine how many moles of Zn must have reacted.

Starting with 2 moles of \(H_2\), we know that it must have come from the reaction of 1 mole of Zn, since the mole ratio of Zn to \(H_2\) is 1:1. Therefore, for every 1 mole of Zn that reacts, we get 1 mole of \(H_2\).

So, if 2 moles  \(H_2\) are produced. Thus, the answer is 2 moles of Zn.

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Answer:

Mark me as Brainliest please

Explanation:

Compression vs Tension

Tension and compression are two concepts discussed in physics. Tension is a force, while compression is a phenomenon. Both these concepts play important parts in fields such as mechanical systems, automobile engineering, heat engines, material science, pendulums and various other fields. It is vital to have a proper understanding in tension and compression in order to excel in such fields. In this article, we are going to discuss what compression and tension are, their definitions, applications of compression and tension, the similarities between compression and tension and finally, the difference between compression and tension.

Answer:

the answer is CO2

Explanation:

because is Na2CO3--> Na2O+........

and there remains 1 atom of Carbon and 2 atoms of oxygen and it reacts and form CO2

Answer:

Precipitates Form

Explanation:

I apologize if I am wrong

Acids are substances that turn wet blue litmus paper to red while bases are substances that turn red litmus paper to blue.

Acids and bases can be differentiated using their definitions as follows:

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Acid has hydrogen ion whereas base has hydroxyl ion.

Acid is a type of chemical compound that is dissolved in water and gives a solution with Hydrogen ions more than purified water. A base is a substance that gives electrons, takes protons, or releases hydroxide (OH-) ions. Acid is also called a proton donor. While a base is also called a proton acceptor.

Acids have a sour taste whereas Bases have a bitter taste. The pH value of acid is lower than 7. Basis has a pH value higher than 7. The strength of Acid depends on the number of Hydrogen ions. The strength of the Base depends on the amount  of Hydroxide ions

An acid is any hydrogen-carrying substance that is able of giving a proton that is to say a hydrogen ion to another substance. A base is a molecule or ion able to gain a hydrogen ion from an acid.

so we can conclude that the molecules which have hydrogen ions are considered acids while those molecules which have hydroxyl ions are considered bases.

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Explanation:

As the temperature increases, the average kinetic energy increases as does the velocity of the gas particles hitting the walls of the container. The force exerted by the particles per unit of area on the container is the pressure, so as the temperature increases the pressure must also increase.

For example, if an engineer has to store 600g of oxygen in a container and that oxygen needs to be kept at a pressure of 1 atm and a temperature of 125 degrees Fahrenheit, then this theorem (which is called Ideal Gas Law) is used to figure out what volume of a container needs to be built.

Answer:

top one is anaphase and the middle one is cytokinesis can't see enough of the bottom one to tell

Explanation:

In functionalized hydrocarbons, a functional group is attached to the core of hydrocarbons (alkanes, alkenes, alkynes). Some examples are methanol (where the hydroxyl group is attached to methane) and it belongs to the chemical class of alcohols.

In organic chemistry, hydrocarbons are organic compounds made entirely of hydrogen and carbon. Hydrocarbons are examples of Group 14 hydrides. Hydrocarbons are generally colorless and hydrophobic, and their odor is usually faint or exemplified by the liquid odor of gasoline or lighters.

Examples of hydrocarbons include gasoline, kerosene, lamp oil, and furniture oil. If someone accidentally drinks a hydrocarbon product that gets into their lungs, it can cause breathing problems. Severe injury or even death can result. Crude oil is a mixture of relatively volatile liquid hydrocarbons (compounds composed primarily of hydrogen and carbon), but it also contains nitrogen, sulfur, and oxygen.

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3.99 teaspoons should be administered to a person weighing 220 pounds

The adult dose of a solution is 0.2 mL/kg of body weight to be administered once daily.

If a person weighs 220 pounds, you have to first convert their weight from pounds to kilograms before you can calculate the dosage.

You should be given the conversion factor of 1 teaspoon = 5 milliliters (mL) or 1 mL

= 0.2 teaspoons (tsp).

Using the conversion factor of pounds to kilograms,1 pound = 0.453592 kilograms

220 pounds = 99.7913 kilograms

Dose = 0.2 mL/kg x 99.7913 kg = 19.95826 mL

To convert the dose from milliliters to teaspoons, use the conversion factor of 1 teaspoon = 5 milliliters.

19.95826 mL × 1 tsp / 5 mL = 3.991652 tsp

Therefore, 3.99 teaspoons should be administered to a person weighing 220 pounds, given the adult dose of 0.2 mL/kg of body weight to be administered once daily.

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Answer:The light-independent reactions use the ATP and NADPH from the light-dependent reactions to reduce carbon dioxide and convert the energy to the chemical bond energy in carbohydrates such as glucose.

Explanation:step-by-step

Answer:

FALSE

Explanation:

I just took the test and put true and it was wrong so it's false. Hope this helps and please mark brainliest!

When Wegener was working, scientists were not aware of plate tectonics, the theory that explains how continents can shift.

The scientific community was not aware of the mechanism underlying the migration of the continents during the time of Wegener. Both the ideas of a solid Earth and plate tectonics had not yet gained widespread acceptance. Initially, scientists were sceptical of Wegener's idea of continental drift because they thought the Earth's surface was permanent and unchanging. The theory's development was hampered by the inability to collect and analyse data on a worldwide scale due to a lack of technology. The scientific world didn't completely embrace the idea of plate tectonics and the part it plays in sculpting the Earth's surface until decades later, with technological breakthroughs and the collection of more evidence.

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Tetrodotoxin (TTX) specifically affects voltage-gated sodium channels.

These channels are responsible for the generation and propagation of action potentials in excitable cells, including neurons and muscle cells. TTX binds tightly to a specific site on the outside of the sodium channel, blocking the movement of sodium ions through the channel pore.

By blocking sodium channels, TTX prevents the influx of sodium ions into cells during depolarization, effectively inhibiting the generation and propagation of action potentials. This leads to the disruption of normal electrical signaling in excitable tissues, resulting in various physiological effects depending on the affected tissues.

Due to its potent inhibitory effects on sodium channels, TTX is known for its use as a toxin, primarily found in pufferfish and certain other marine organisms. Ingesting TTX-contaminated seafood can lead to severe poisoning, characterized by paralysis, respiratory failure, and potentially fatal consequences.

Research on TTX and its interactions with sodium channels has also provided valuable insights into the function and structure of these channels, contributing to our understanding of electrical signaling in cells and the development of drugs targeting sodium channels for therapeutic purposes.

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Answer:

So, is the human eye concave or convex? The human eye has a biconvex lens. The lens in the eye refracts the light and focuses it on the retina. Unlike the normal lens, the biconvex lens in the eye can change the shape.

Explanation:

The effective nuclear charge of sulfur is 14, and the effective nuclear charge of chlorine is 15.

Effective nuclear charge (Zeff) is a measure of the positive charge felt by the valence electrons. The effective nuclear charge (Zeff) of s and Cl is calculated using the simple formula zeff = z – s, where z is the atomic number and s is the screening constant. Screening constant (s) is the number of electrons between the nucleus and the valence electrons that shield the valence electrons from the full nuclear charge of the nucleus.

For sulfur (S), the atomic number is 16, and there are two electrons in the innermost shell and four electrons in the second shell. So, the number of valence electrons in sulfur is 6. The screening constant of S is 2. Effective nuclear charge of sulfur = z – s= 16 - 2= 14

For chlorine (Cl), the atomic number is 17, and there are two electrons in the innermost shell and eight electrons in the second shell and seven valence electrons. Therefore, the screening constant of Cl is 2. Effective nuclear charge of chlorine = z – s= 17 - 2= 15

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The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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Answer:

4 moles of HCl will be required to produce 2 moles of H2.

Explanation:

A balanced chemical equation gives the stoichiometric ration of moles of reactants required to produce a certain number of moles of products. The ratio of moles of reactants to moles of products is known as the mole ratio and is constant for a given chemical reaction.

In the given balanced equation of reaction shown below:

Zn + 2HCl → ZnCl2 + H2

The mole ratio of HCl and H2 is 2:1. This means that in this reaction between Zinc metal and hydrochoric acid to produc zinc chloride and hydrogen gas, every two moles of hydrochloric acid used in the reaction will result in the production of one mole of hydrogen gas.

Therefore for two moles of H2 to be obtained from the reaction, twice the number of moles of HCl is required.

Moles of HCl required = 2 × 2 moles = 4 moles of HCl.

Answer: The alkyne

Explanation:

Answer:

the alkyne

Explanation:

Hope it helps u

FOLLOW MY ACCOUNT PLS PLS

Answer: B. Mass

Explanation: The quantity of matter anything contains is called mass.

Here are the answers to the given post-lab questions:1. The color of the product was pale yellow, its mass was 0.082g, and the percent yield was 66.23%.

Calculation for percent yield:% Yield = (Actual yield/Theoretical yield) × 100%Theoretical yield = (Molar mass of anthracene-9-methanol/Molar mass of anthracene) × Moles of N-Methylmaleimide usedActual yield = Mass of product obtainedPercent yield = Actual yield/Theoretical yield × 100% = (0.082/0.124) × 100% = 66.23%2. The melting point range of the crude product was 232.8 − 236.2°C. The literature value of the melting point is 237-239°C. Therefore, the purity of the product was low.3.

The following arrow-pushing mechanism illustrates the Diels-Alder reaction of anthracene-9-methanol and N-maleimide:4. Anthracene is a suitable diene for the Diels-Alder reaction because it has two alternating double bonds, which are responsible for the formation of cyclic compounds through a Diels-Alder reaction.5. The hydrophobic effect is caused by nonpolar substances interacting with one another. The nonpolar molecules in water form clusters because they are attracted to one another.

The interactions between nonpolar molecules are stronger than the interactions between water molecules. The "hydrophobic effect" explains why organic compounds aggregate in water.6. a. Atom Economy = (Molar mass of anthracene-9-methanol + Molar mass of N-Methylmaleimide)/Molar mass of anthracene × 100%Atom Economy = (188.23 + 111.1)/178.24 × 100% = 178.24% b. E-Factor = Mass of waste produced/Mass of product obtainedE-Factor = (Mass of N-Methylmaleimide + Mass of Anthracene-9-methanol - Mass of product obtained)/Mass of product obtainedE-Factor = (0.106 + 0.067 - 0.082)/0.082 = 0.9548 or 95.48%.

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Answer:

it takes the train 1 hour and 75 minutes

Explanation:

you multiply the constant speed starting from 1 (which represents 1 hour) then you add as many decimal places as you need. Bit of a confusing explanation

The concentration of the acid is 1.8 M if it takes 40.0 ml of a 0.900 m powerful base to exactly neutralize 20 ml of acid of a given concentration.

Volume of solution = 40.0 ml

Numer of moles = 0.900 m

The balanced chemical equation for the neutralization reaction between the acid and the strong base is:

acid + strong base = salt + water

We need to find the number of moles of strong base used in the reaction:

moles of strong base = volume of strong base × concentration of strong base

moles of strong base = 0.040 L × 0.900 mol/L

moles of strong base = 0.036 mol

Now, the concentration of acid is calculated by the product of moles of acid and volume of acid.

the concentration of acid = moles of acid/volume of acid

volume of acid = 0.020 L

the concentration of acid = 0.036 mol / 0.020 L

concentration of acid = 1.8 M

Therefore, we can conclude that the concentration of the acid is 1.8 M.

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The given double displacement reaction can be balanced as written below:

\(\rm 3CaCl_{2} + 2Na_{3}PO_{4} \rightarrow Ca_{3}PO_{4} + 6 NaCl \\\)

Displacement reactions are those in which one or two groups are replaced to form the new products. There are both single displacement reaction and double double displacement reactions.

In single displacement reactions, only one reactant will be replaced in the reaction whereas in double displacement reactions, two groups from the reactants are exchanged each other.

In the given reaction, the phosphate group is replaced to Ca and the Cl is group is shifted to Na metal as written in the chemical equation.

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