Someone PLEASE help me I don’t remember this.

Explanation:

Density = mass/volume

.: volume = mass/density

Volume = 77/3.5

Volume = 22cm³

Answer:

Synthesis reaction

Explanation:

Two or more elements or compounds combining to make one complex substance occurs in a synthesis reaction.

A synthesis or combination reaction is one that involves the formation of a single product from two or more reactants.

   A + B + C →  D

Answer:

20 atoms total

Explanation:

N (3) + H (12) + P (1) + O(4) = 20 atoms

Answer:

The acid mist is known as laze - a term combining the words lava and haze - when laze and sea water combine. Laze is potentially deadly if inhaled and can be hot and corrosive. If anyone goes near it, they can experience breathing difficulties and irritation of their eyes and skin.

Explanation:

hope it helps :)

The treatment of an alkene with Br2 and water adds the substituents Br across the double bond to form a halohydrin. This reaction is known as halogenation.

The Br2 molecule is first polarized by the double bond of the alkene, causing the bromine molecule to break apart and form a bromonium ion. The bromonium ion then reacts with water, which acts as a nucleophile, attacking the positive charge of the bromonium ion and displacing one of the bromine atoms. This results in the addition of a bromine atom and a hydroxyl group (OH) across the double bond, forming a halohydrin. In conclusion, the treatment of an alkene with Br2 and water leads to the formation of a halohydrin, with a bromine atom and a hydroxyl group added across the double bond.

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A second-order reaction results in the breakdown of substance X. It takes 0.50 0.025 h for just a solution with an initial concentration of 1.00 0.5 M in X to degrade to 0.025 M 0.50M.

Reaction is what?

reaction definition 1 a: the reactionary act, process, or instance b: a power, influence, or activity that is opposed or opposed to especially: propensity for an old, typically obsolete political, social, or policy

What does a response time test entail?

regarding the test. This is a straightforward tool for calculating reaction times. According to the information gathered so far, the response time was 215 milliseconds on average (median). The latency of the computer and screen has an impact on this test in addition to assessing your reaction time.

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In conclusion, the statement that "group of answer choices a, c, g, and u are the only bases present in the molecule" is false.

tRNA or transfer RNA is a type of RNA that binds to a specific amino acid and transports it to the ribosome during protein synthesis. The tRNA molecule has an anticodon, which is a sequence of three nucleotides that complement the codon on the mRNA.

This allows the tRNA to read the genetic code and match the correct amino acid with the codon. However, the statement "group of answer choices a, c, g, and u are the only bases present in the molecule" is false. While adenine (A), cytosine (C), guanine (G), and uracil (U) are the primary bases found in tRNA molecules, some modifications occur on the bases of the tRNA molecules which do not include those four nucleotides.

This includes methylation and thiolation of the nucleotides present in the tRNA molecules. Methylation is the addition of a methyl group (-CH3) to the base of a nucleotide, whereas thiolation is the addition of a sulfur atom to the base of a nucleotide. This is because while adenine (A), cytosine (C), guanine (G), and uracil (U) are the primary bases found in tRNA molecules, some modifications occur on the bases of the tRNA molecules which do not include those four nucleotides.

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The given chemical equation is:H+ + CN- ⇋ HCN .The equilibrium constant is given as:Kc = [HCN]/([H+] [CN-])We know that the concentration of NaCN is equal to the concentration of CN-, the [CN-] is 0.100 M.

The formula to calculate pH is:pH = -log[H+]Initially, we need to calculate the concentration of H+ ions.Using the chemical equation, we can write:

[HCN] = [H+] [CN-]/KcLet [H+] be x, we have

[HCN] = x (0.100)/Kc[HCN]

= (x * 0.100)/9.12 x 10^-10

= (0.100x)/9.12 x 10^-10(x * 0.100)/(0.100x)

= 9.12 x 10^-10/0.100

= 9.12 x 10^-9

Now we can apply the quadratic formula to solve for x.

x2 + 9.12 x 10^-9 x - 9.12 x 10^-11 = 0x

= (-9.12 x 10^-9 ± √(9.12 x 10^-9)^2 - 4(1)(-9.12 x 10^-11))/(2(1))x

= (-9.12 x 10^-9 ± √8.34144 x 10^-17)/2

Now we need to select the correct value for x.pH = -log[H+]When we solve for x, we get two values:

x = 1.20 x 10^-4, -7.56 x 10^-10

Since the value of x cannot be negative, we select the positive value of x.

x = 1.20 x 10^-4pH

= -log[H+]pH

= -log[1.20 x 10^-4]pH

= 3.9

Therefore, the correct answer is option C. 4.52.

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Since pH + pOH = 14, we can calculate the pH:

pH = 14 - pOH = 14 - 4.52 = 9.48

Therefore, the pH of the 0.100 M NaCN solution is approximately 9.48.

To calculate the pH of a solution of NaCN, we need to consider the dissociation of NaCN into Na+ and CN- ions. CN- can react with water to form HCN and OH- ions. The equilibrium expression for this reaction is:

CN- + H2O ⇌ HCN + OH-

Given that the K value for this reaction is 9.12 x 10^(-10), we can set up an equilibrium expression:

K = [HCN] * [OH-] / [CN-]

Since NaCN is a strong electrolyte, we can assume that the concentration of CN- after dissociation is equal to the initial concentration of NaCN, which is 0.100 M.

Let's assume that the concentration of OH- at equilibrium is x M. The concentration of HCN would also be x M, and the concentration of CN- would be 0.100 M - x M.

Plugging these values into the equilibrium expression, we have:

9.12 x 10^(-10) = (x * x) / (0.100 - x)

Simplifying the equation, we get:

9.12 x 10^(-10) = x^2 / (0.100 - x)

Multiplying both sides by (0.100 - x), we have:

9.12 x 10^(-10) * (0.100 - x) = x^2

Expanding and rearranging the equation, we obtain a quadratic equation:

9.12 x 10^(-11) - 9.12 x 10^(-10) * x + x^2 = 0

Now, we can solve this equation using the quadratic formula:

x = (-b ± √(b^2 - 4ac)) / (2a)

For this equation, a = 1, b = -9.12 x 10^(-10), and c = 9.12 x 10^(-11).

Solving the quadratic equation using the quadratic formula, we find two solutions for x:

x = 2.98 x 10^(-5) M (approximately) or x = 9.12 x 10^(-6) M (approximately)

The concentration of OH- at equilibrium is x, so the concentration of OH- is approximately 2.98 x 10^(-5) M.

Since pH is defined as the negative logarithm of the hydrogen ion concentration, we can calculate the pOH as:

pOH = -log10([OH-]) = -log10(2.98 x 10^(-5)) = 4.52

Finally, since pH + pOH = 14, we can calculate the pH:

pH = 14 - pOH = 14 - 4.52 = 9.48

Therefore, the pH of the 0.100 M NaCN solution is approximately 9.48.

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The produced at the anode in the electrolysis of molten CuF2 is A. F₂.

During electrolysis, CuF₂ will separate into Cu₂⁺ cations and F⁻anions. Cu₂⁺ will be reduced to copper metal, which will deposit on the cathode, whereas F⁻ anions will be oxidized to fluorine gas on the anode in the electrolysis of molten CuF₂. Hence, the answer is option A. Fluorine gas (F₂) is generated at the anode in the electrolysis of molten CuF₂.

Therefore, during the electrolysis of molten CuF₂, Cu₂⁺ is reduced to copper metal, which deposits on the cathode, and F⁻ anions are oxidized to fluorine gas on the anode, which is produced at the anode. The chemical reactions taking place during electrolysis of CuF₂ are given below: At the cathode, Cu₂⁺ cations get reduced to copper metal. Cu₂⁺ + 2e⁻ ⟶ Cu. At the anode, F⁻ anions get oxidized to fluorine gas. 2F⁻ ⟶ F₂ + 2e⁻. Therefore, option A is correct.

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Answer:

62.21 gm

Explanation:

From periodic table   K = 39    I = 126.9  

    mole weight =   39 + 126.9 = 165.9

.750 Molar  =     .75 * 165.9 = 124.425  gm   per LITER

        you only need 1/2 of a liter so ===>   1/2 * 124.425 = 62.21 gm

Molar mass is the mass of one mole of a substance. Therefore, the molar mass of trans-9-(2-phenylmethyl)anthracene is 356.44 g/mol.

The substance in question is trans-9-(2-phenylethenyl)anthracene. This organic compound can be represented as C28H20. The molar mass of trans-9-(2-phenylethenyl)anthracene is therefore calculated as follows:Step 1Determine the molar mass of carbon (C) and hydrogen (H). The atomic mass of carbon is 12.01 g/mol, and the atomic mass of hydrogen is 1.008 g/mol. Step 2Calculate the total molar mass of carbon and hydrogen in the compound. Multiply the atomic mass of carbon by the number of carbon atoms in the compound (28), and multiply the atomic mass of hydrogen by the number of hydrogen atoms in the compound (20).Step 3Add the molar masses of carbon and hydrogen to get the total molar mass of the compound. 12.01 × 28 + 1.008 × 20 = 336.28 + 20.16 = 356.44 g/molTherefore, the molar mass of trans-9-(2-phenylethenyl)anthracene is 356.44 g/mol.

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Answer

moles = 5.81 mol

Explanation

Given:

Volume = 144 L

AT SATP

1 mole = 24.4651 L

Solution:

1 mole = 24.4651 L

x mole = 144 L

x = 144/24.4651

x = 5.8 mol

The heat lost by 18.0 g of ethanol during cooling from 63.5 °C to -47.0 °C is approximately -4,193.76 J (or 4.19 kJ, rounded to two decimal places).

The temperature change and the mass of the substance are given. To calculate the heat lost by ethanol during cooling, we can use the formula:

q = mcΔT

where:

q = heat lost or gained (in joules)

m = mass of the substance (in grams)

c = specific heat capacity of the substance (in J/g·°C)

ΔT = change in temperature (in °C)

First, we need to determine the specific heat capacity of ethanol. The specific heat capacity of ethanol is approximately 2.44 J/g·°C.

Next, let's calculate the heat lost by the given mass of ethanol during cooling.

Step 1: Convert the mass of ethanol to grams.

The given mass is already in grams, so no conversion is needed.

Step 2: Calculate the change in temperature.

ΔT = final temperature - initial temperature

ΔT = (-47.0 °C) - (63.5 °C)

ΔT = -110.5 °C

Step 3: Plug the values into the formula and solve for q.

q = (18.0 g) × (2.44 J/g·°C) × (-110.5 °C)

q ≈ -4,193.76 J

Therefore, the heat lost by 18.0 g of ethanol during cooling from 63.5 °C to -47.0 °C is approximately -4,193.76 J (or 4.19 kJ, rounded to two decimal places). Note that the negative sign indicates heat loss.

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Answer:

yes

Explanation:

The growth of the balloon after being taken out of liquid nitrogen is a result of the increase in temperature, which leads to an increase in the kinetic energy and speed of the gas molecules, causing them to spread out and expand, resulting in the expansion of the balloon.

The phenomenon you are describing, where a small, partially inflated balloon grows in size after being taken out of liquid nitrogen, can be explained by the principles of gas expansion due to temperature change.

When the balloon is submerged in liquid nitrogen, it is exposed to an extremely low temperature. As a result, the air molecules inside the balloon lose thermal energy and their average kinetic energy decreases. This decrease in kinetic energy causes the molecules to slow down and move closer together, leading to a decrease in pressure and volume of the gas inside the balloon.

When the balloon is removed from the liquid nitrogen and placed on the table, it starts to warm up. As the temperature increases, the air molecules regain thermal energy and their average kinetic energy rises. This increase in kinetic energy causes the molecules to move faster and spread out, leading to an increase in pressure and volume of the gas inside the balloon.

Furthermore, gases typically exhibit a property known as Thermal expansion, which means they expand when heated and contract when cooled. As the temperature of the air inside the balloon rises, the gas expands, causing the balloon to grow in size.

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Answer:

, the sides of the bucket will be pushed out and above a rim, just like when you put a water bottle in a freezer for 24 hours, the sides will be pushed out.

Explanation:

this is the answer I found online so I hope it's right :,)

Answer:

There are different types of soil in the earth. Those different types of soil helps the earth stay healthy in many ways!! Just like the different layers in the earth. There are so many different layers in the earth so that the plants get the different nutrition they need. Not only that but it cleans the water that soaks in the ground.

There are 6 different types of soil, they are; sandy soil, clay soil, silt soil, peat soil, chalk soil, and loam soil.

Explanation:

Sandy soil

Sandy Soil is light, warm, dry and tend to be acidic and low in nutrients. Sandy soils are often known as light soils due to their high proportion of sand and little clay (clay weighs more than sand). These soils have quick water drainage and are easy to work with. They are quicker to warm up in spring than clay soils but tend to dry out in summer and suffer from low nutrients that are washed away by rain. The addition of organic matter can help give plants an additional boost of nutrients by improving the nutrient and water holding capacity of the soil.

Clay Soil

Clay Soil is a heavy soil type that benefits from high nutrients. Clay soils remain wet and cold in winter and dry out in summer. These soils are made of over 25 percent clay, and because of the spaces found between clay particles, clay soils hold a high amount of water. Because these soils drain slowly and take longer to warm up in summer, combined with drying out and cracking in summer, they can often test gardeners.

Silt Soil

Silt Soil is a light and moisture retentive soil type with a high fertility rating. As silt soils compromise of medium sized particles they are well drained and hold moisture well. As the particles are fine, they can be easily compacted and are prone to washing away with rain. By adding organic matter, the silt particles can be bound into more stable clumps.

Peat Soil

Peat soil is high in organic matter and retains a large amount of moisture. This type of soil is very rarely found in a garden and often imported into a garden to provide an optimum soil base for planting.

Chalk Soil

Chalk soil can be either light or heavy but always highly alkaline due to the calcium carbonate or lime within its structure. As these soils are alkaline they will not support the growth of ericaceous plants that require acidic soils to grow. If a chalky soil shows signs of visible white lumps then they can’t be acidified and gardeners should be resigned to only choose plants that prefer an alkaline soil.

Loam Soil

Loam soil is a mixture of sand, silt and clay that are combined to avoid the negative effects of each type. These soils are fertile, easy to work with and provide good drainage. Depending on their predominant composition they can be either sandy or clay loam. As the soils are a perfect balance of soil particles, they are considered to be a gardeners best friend, but still benefit from topping up with additional organic matter.

Those are the different types of soils with all of their many uses. I hope this helps!!!!! Have a wonderful day!!!

False. Chemical weathering of limestone is not an example of incongruent weathering. Incongruent weathering refers to a type of chemical weathering where a mineral decomposes into multiple products that have different chemical compositions than the original mineral.

This typically occurs when a mineral dissolves in water and undergoes a chemical reaction that results in the formation of new compounds. In the case of limestone, the main component is calcium carbonate (CaCO3). When limestone undergoes chemical weathering, it primarily reacts with water and carbon dioxide in the atmosphere through a process called carbonation.

This leads to the formation of calcium bicarbonate (Ca(HCO3)2), which is soluble in water and can be carried away in solution. The chemical composition of the limestone is altered, but the reaction does not produce multiple products with different chemical compositions. Therefore, chemical weathering of limestone is not an example of incongruent weathering.

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Answer:

Concentration is a measure of how much solute (or dissolved "stuff") is present per amount of solvent (or dissolving liquid) in a solution. The most common measurement of concentration is molarity, abbreviated M. Molarity is expressed in amount per volume, or moles/liter.

Explanation:

Hydration is a specific example of the phenomenon known generally as a. solvation

The act of hydrating involves combining or dissolving an object in water. It is a particular instance of the more general phenomena known as solvation, which is the process by which solvent molecules surround and scatter a solute to create a homogeneous solution. However, hydration explicitly refers to solvation with water as the solvent.

Solvation may also happen with solvents other than water. Solvation is the process through which a solute and solvent interact to stabilise a solute species. Due to its impact on the solubility, reactivity, and behaviour of compounds in solution, solvation is a crucial mechanism in many chemical and biological processes.

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The standard enthalpy change for reaction (3) is 117.1 kJ.

The standard enthalpy change for reaction (3) can be calculated by using the enthalpy changes of reactions (1) and (2) and applying Hess's Law.

To do this, we need to manipulate the given equations so that the desired reaction (3) can be obtained.

First, we reverse reaction (1) to get the formation of C2H4(g) from C2H6(g):

C2H4(g)C2H6(g) ΔH° = -52.3 kJ

Next, we multiply reaction (2) by 2 and reverse it to obtain 2 moles of C2H6(g) reacting to form 3 moles of H2(g):

2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

Now, we add the two modified equations together:

C2H4(g)C2H6(g) ΔH° = -52.3 kJ
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

When adding these equations, the C2H6(g) on the left side cancels out with the C2H6(g) on the right side, leaving us with the desired reaction (3):

C2H4(g) + H2(g)C2H6(g) ΔH° = -52.3 kJ + 169.4 kJ = 117.1 kJ

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1. if 17.5 grams of MgCl2 are reacted, 16.3 grams of AlCl3 are produced.

2. the number of grams of CO2 produced is 0.78 mol * 44.0 g/mol = 34.3 g.

3. 440.64 grams of HCl are produced by the reaction of 48.5 grams of CH4.

we need to find the number of moles of MgCl2 that are present i question 1 :

n = m/M = 17.5 g / (95.21 g/mol) = 0.184 mol

we the can find the number of moles of AlCl3 that are produced:

n = 0.184 mol * (2 mol AlCl3 / 3 mol MgCl2) = 0.123 mol

in conclusion, we find the number of grams of AlCl3 produced:

m = n * M = 0.123 mol * (133.34 g/mol) = 16.3 g

We can say that if if 17.5 grams of MgCl2 are reacted, 16.3 grams of AlCl3 are produced.

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Answer:

Yes, A  toothpick can be a good model for showing the strength and brittleness of salt as It will break and splinter just like salt.

What are the properties of  salt ?

Salts are ionic in nature due to the presence of ions.

They are brittle, hard and crystalline solids.

Salt is white, odorless and it has a salty taste.

Toothpick will break and splinter just like salt, exclamation, because it breaks easy and if we use a hammer on a tooth pick its gonna break and splinter just like salt.

Therefore , A  toothpick can be a good model for showing the strength and brittleness of salt as It will break and splinter just like salt.

Explanation: hope this helps

Answer:

Solute - The solute is the substance that is being dissolved by another substance. In the example above, the salt is the solute. Solvent - The solvent is the substance that dissolves the other substance.

Explanation:

The concentration of A decreases and then levels out. Option A

In many chemical reactions, a reactant is consumed as the reaction progresses, leading to a decrease in its concentration over time. The reactant molecules are transformed into products, and as the reaction proceeds, the concentration of the reactant gradually diminishes.

At equilibrium, the concentrations of both reactants and products remain relatively constant over time, although they can coexist.

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Answer:

Deserts and oceans appear to be far from one another will little in common, but in fact, they're connected in an intresting way.Water from the open evaporates into clouds that travel and eventually empty the water onto the land,creating much-needed sources of water in dessert areas.Meanwhile,winds from the dessert sweep up billions of tons of dust intosky,at least a quarter of which falls into the ocean and provides nutrients for marine life.

Explanation:

Answer:

It both benefits the bird by providing sustenance and the plant by possibly spreading seeds through fecal matter.

Explanation:

The equation of the formation of lead II nitrate is;

Pb (s) + N2(g) + 3O2(g) --> Pb(NO3)2(s)

The equation of the formation of NaCl is 2Na(s) + Cl2(g) --->NaCl(s)

The equations of formation of the NaCl and Pb(NO3)2 from the standard states have been shown above.

The physical state of a substance under normal circumstances, which are commonly described as a pressure of 1 atmosphere (atm) and a temperature of 25°C, is known as the standard state of a substance.

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Answer: 35.84

Explanation: Look at the most uncertain number and your sum should have the same number of decimal places as that. In this case it is 4.26 which as 2 numbers following the decimal point, so your answer should too.