In a solid to liquid mixture and increase in temperature means?

Answer:

17.5moles

Explanation:

The number of moles in a substance can be calculated by using the formula;

Number of moles (n) = mass (m) ÷ molar mass (MM)

According to this question, mass of ammonia (NH3) = 297g

Molar Mass of NH3 = 14 + 1(3)

= 17g/mol

n = 297/17

n = 17.47

Number of moles of NH3 = 17.5moles

Marine creatures that use CaCO3 to create shells are most sensitive to changes in pH levels. CaCO3 is the chemical symbol for calcium carbonate, which is a mineral that is present in many forms of sedimentary rock.

Calcium carbonate is a significant component of many seashells, corals, and other marine invertebrate hard structures.

It is also used to make lime, a substance that is utilized in the building industry.

pH, on the other hand, refers to the level of acidity or alkalinity of a solution, on a scale of 0 to 14. A pH of 7 is neutral, while a pH of less than 7 is acidic, and a pH of more than 7 is alkaline.

The pH level of seawater typically ranges between 7.5 and 8.5, making it moderately alkaline.

The pH level of seawater varies depending on the time of day, season, and location.

When pH levels in the ocean decrease, it becomes more acidic, and calcium carbonate shells dissolve.

This is because acidic seawater reacts with calcium carbonate, which is present in the shells of marine organisms, causing it to dissolve.

Acidification can impair the capacity of creatures such as corals, mollusks, and some plankton to construct and maintain their shells.

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In general, covalent bonds form between nonmetals, ionic bonds form between metals and nonmetals, and metallic bonds form between metals.

As a general rule of thumb, compounds that contain a metal binding with both a non-metallic or a semi-metallic will show ionic bonding. Compounds that are composed of best non-metals or semi-metals with non-metals will show covalent bonding and may be categorised as molecular compounds.

those molecules that encompass charged ions with opposite prices are referred to as IONIC. these ionic compounds are generally solids with excessive melting points and conduct electric contemporary. Ionic compounds are typically formed from metal and a non-metal elements.

Covalent bonding normally happens between nonmetals. Covalent bonding is the sort of bond that holds together the atoms inside a polyatomic ion. It takes electrons to make a covalent bond, one from every bonding atom.

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Answer:

it's because they need warm ocean temperature/water

Answer:

Diagram: the bottom label is roots, the one above that is stems, and the one above it is leaves.

Definition for root: The section for the plant where it is linked to the ground.

Defintion for stems: The main part of the plant which rises above the ground

Defintion for leaves: A green blade-like structure that is flat and connceted to the stem.

Explanation:

Hope this helps!

the expected pH of each buffer solution, we need to consider the dissociation of the acidic or basic components of the buffer and their respective equilibrium constants.

For the 0.1 L solution of 2.0 M HCl using concentrated 12 M HCl:
HCl is a strong acid and will completely dissociate in water

For the 0.1 L solution of 2.0 M NaOH using the pure solid:NaOH is a strong base and will completely dissociate in water, giving OH- ions. Therefore, the pH of this solution will be high, close to 14.

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a.the concentration of H+ ions will be 12 M. pH = -log[H+] = -log(12) = 1.08.

b. pH = 14 - pOH = 14 - 0.30 = 13.70.

c. By calculating the concentration of H+ ions from the Ka value, we can find the pH of the solution.

d. y calculating the ratio of acetate ions (CH3COO-) to acetic acid (CH3COOH), we can find the pH of the buffer using the Henderson-Hasselbalch equation.

To determine the expected pH of the given buffer solutions, we need to consider the components of each solution and their acid-base properties.

a. 0.1 L of 2.0 M HCl (using conc. 12 M HCl): Since HCl is a strong acid, it completely dissociates in water to give H+ ions. So, the concentration of H+ ions will be 12 M. pH = -log[H+] = -log(12) = 1.08.

b. 0.1 L of 2.0 M NaOH (using the pure solid): NaOH is a strong base and completely dissociates in water to give OH- ions. So, the concentration of OH- ions will be 2 M. pOH = -log[OH-] = -log(2) = 0.30. To find pH, we subtract pOH from 14: pH = 14 - pOH = 14 - 0.30 = 13.70.

c. 50 mL of 0.050 M potassium hydrogen phthalate: Potassium hydrogen phthalate (KHP) is a weak acid. The acid dissociation constant (Ka) for KHP is known. By calculating the concentration of H+ ions from the Ka value, we can find the pH of the solution.

d. 50 mL of 0.075 M acetic acid and 0.325 M sodium acetate (0.400 M acetate buffer): Acetic acid (CH3COOH) is a weak acid and sodium acetate (CH3COONa) is its conjugate base. By calculating the ratio of acetate ions (CH3COO-) to acetic acid (CH3COOH), we can find the pH of the buffer using the Henderson-Hasselbalch equation.

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A biodiverse environment, one with many distinct species, is frequently more adaptable to changing conditions and can endure major shocks. Each species has a distinct purpose in the coral reef ecosystem.

Better biodiversity contributes to greater stability in ecosystems, animals, and individuals. Species with significant genetic diversity and diverse populations that are adapted to a wide range of environments, for example, are more likely to withstand disturbances, illness, and climate change.

Biodiversity, also known as biological diversity, refers to the variety and variability of life on Earth. Biodiversity is a measure of genetic, species, and ecological variation.

Soil fertilization, nutrient recycling, pest and disease controls, erosion control, and crop and tree pollination are all provided by biodiversity.

High biodiversity is preferable to low biodiversity because high biodiversity ecosystems are better equipped to maintain equilibrium and be productive.

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Answer:

Meiosis

Explanation:

This is The process of cell division in which the resulting cells have half the chromosomes number of the parent cell.

Answer:

(NH4)2Se

Explanation:

The  chemical formula for  compound ammonium selenide is (NH₄)₂Se.

Here's a step-by-step explanation of how we arrive at this formula:

1. Ammonium ion: The ammonium ion is represented by the formula NH₄⁺. It consists of one nitrogen atom (N) bonded to four hydrogen atoms (H).

2. Selenide ion: The selenide ion is represented by the formula Se₂⁻. It consists of one selenium atom (Se) with a charge of -2.

3. Combining the ions: To form a neutral compound, we need to balance the charges of the ions. Since the ammonium ion has a charge of +1 and the selenide ion has a charge of -2, we need two ammonium ions to balance the charge of one selenide ion.

4. Formula: Therefore, the formula for ammonium selenide is (NH₄)₂Se, indicating that two ammonium ions are required for each selenide ion.

Thus, ammonium selenide has chemical formula of (NH₄)₂Se.

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Alkyl bromides are created when an alkene and HBr interact in the presence of factors such as heat, sunshine, or peroxides. A radical intermediate is used in this reaction to progress.

What is Alkene?

Alkenes, and ethene in particular, play a crucial role in the chemical industry. They are created during the cracking of the alkanes but are not present in significant amounts in crude oil. Like all hydrocarbons, alkenes burn in the presence of air to produce carbon dioxide and water. Ethene reacts violently in oxygen, making it ineffective as a fuel. Additionally, the alkenes are too useful for the production of plastics and many other compounds to be used as fuels in the chemical industry.

Compound A reacts with HBr to produce 2-bromohexane as a byproduct. 1-Bromohexane is created when component an interacts with HBr and peroxide.

In the absence of light, the carbocation intermediate is used to add HBr. In the presence of light, the radical intermediate is used to add HBr.

The result of component B reacting with HBr is 1-bromo-1-methylcyclohexane. 1-Bromo-2-methylcyclohexane is produced via the reaction of component b with HBr and peroxide.

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Answer:

the answer is B

Explanation:

because its asking you the frequent summertime storms

hope it helps you

Answer:

b is your answer i'm sure of it :)

Explanation:

have great day :)

Answer:

Q = 3440Kj

Explanation:

Given data:

Mass of gold = 2kg

Latent heat of vaporization = 1720 Kj/Kg

Energy required to vaporize 2kg gold = ?

Solution:

Equation

Q= mLvap

It is given that heat required to vaporize the one kilogram gold is 1720 Kj thus, for 2 kg

by putting values,

Q= 2kg ×  1720 Kj/Kg

Q = 3440Kj

It will take approximately 26.5 seconds for 65% of the initial quantity of reactant to be consumed in this first-order reaction.

The integrated rate law for a first-order reaction is:

ln([A]t/[A]0) = -kt

where [A]t is the concentration of a reactant at time t, [A]0 is the initial concentration, k is the rate constant, and ln is the natural logarithm.

To solve for t when 65% of the initial quantity of reactant is consumed, we can use the following steps:

Determine the concentration of reactant remaining after 65% is consumed:

[A]t = (1 - 0.65) [A]0 = 0.35 [A]0

Rearrange the integrated rate law to solve for time t:

t = -ln([A]t/[A]0) / k

Substitute the given values and solve for t:

t = -ln(0.35) / 0.0450 s⁻¹

t ≈ 26.5 seconds

Therefore, it will take approximately 26.5 seconds for 65% of the initial quantity of reactant to be consumed in this first-order reaction.

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Out of the options listed, "Water vapor, carbon dioxide, and other volatile organic compounds (VOCs)" would not be considered a material stream exiting the roaster.

A material stream is a flow of a physical substance, such as a solid, liquid, or gas, that enters and exits a system or process. In the context of a chemical or process plant, a material stream is a stream of raw materials, intermediate products, or final products that are being produced, transported, or processed.

To perform a mass balance on a coffee roaster, you would consider all the material streams that enter and exit the system. These are gaseous emissions resulting from the roasting process and are not a physical material. The other options, "Spent coffee grounds," "Chaff," and "Roasted coffee beans" are physical materials that can be weighed and measured, and would be considered as material streams exiting the roaster.

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Answer:

Strait.

Explanation:

After a fast online search, I've found that the list of words are:

Athens

Age of Pericles

satraps

tyrant

Cyrus the Great

hoplites

Parthenon

peninsula

upper-class Athenian women

strait

Well, the definition is:

"A narrow body of water with land on both sides"

This is something like a river, so we need to find which one of these words means something like river.

To do it, let's look at short definitions of each word:

Athens: This is the capital city of Grece. (Isn't the correct option)

Age of Pericles:  This refers to a historical period (isn't the correct option)

Satraps: Were governors in the Persian empire (Isn't the correct option)

Tyrant: Refers to a cruel leader (Isn't the correct option)

Cyrus the Great: Was the founder of the Achaemenid Empire (isn't the correct option)

Hoplites: A citizen-soldier (isn't the correct option)

Parthenon: A construction in Grece (isn't the correct option)

Peninsula: A small body of land surrounded mostly by water, but connected to land (isn't the correct option)

upper-class Athenian women: It is self-explained, this isn't the correct option.

Strait: This refers to a narrow passage of water that connects two larger areas of water (like two seas, for example)

Then this one is the correct option.

First, we can translate the sentence into an equation: 1/4 + m/6 = 2/3.

Next, we can multiply both sides by 12 to get rid of the fractions: 3 + 2m = 8.

Subtracting 3 from both sides gives us 2m = 5.

Finally, dividing both sides by 2 gives us m = 5/2 or m = 2.5.

So the solution to this equation is m = 2.5.

Answer:

A common problem in algebra is to find the value of a variable that satisfies a given equation. For example, suppose we want to find the value of m that makes the following statement true: 1/4 more than the quotient of m, and 6 is the same as 2/3. To solve this problem, we need to translate the words into mathematical symbols and operations. The quotient of m and 6 means m divided by 6, which we can write as m/6. 1/4 more than something means adding 1/4 to that something, which we can write as + 1/4. The same as means equal to, which we can write as =. Therefore, the equation we need to solve is:

m/6 + 1/4 = 2/3

To find the value of m, we need to isolate it on one side of the equation by using inverse operations. We can subtract 1/4 from both sides to eliminate the constant term on the left side:

m/6 = 2/3 - 1/4

Then, we can multiply both sides by 6 to eliminate the fraction on the left side:

m = 6 * (2/3 - 1/4)

Finally, we can simplify the expression on the right side by finding a common denominator and subtracting the fractions:

m = 6 * (8/12 - 3/12)

m = 6 * (5/12)

m = 5/2

Therefore, the value of m that satisfies the equation is 5/2 or 2.5

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Answer: The answer is elastic potential energy

Explanation: Potential energy is stored energy if something is elastic that means the shape or form of an object is being compressed from its original form. Like elastic girl from the incredibles lol. but anyways if you compare somehting to a rubber band it has elastic potential energy Thus the answer is D.

Hope this helps :).

When you bend, stretch, or compress an object from its natural shape, it stores Elastic potential energy.

Elastic energy is the mechanical potential energy held in a material's or a physical system's configuration as it is subjected to elastic deformation as a result of work being done on it. Elastic energy is created when objects are momentarily crushed, stretched, or otherwise deformed.

Because it is stored in the bonds between atoms of an object or substance when it is momentarily stressed, elastic energy is a type of potential energy. The object may have been stretched or compressed, causing this stress.

An object's shape may change as a result of a force operating on it. If stretched or compressed, elastic things can store elastic potential energy. This occurs, for instance, when a spring is stretched or a catapult is utilized.

Thus, option D is correct.

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Answer: B. The molecules move faster and become less dense

Explanation:

Liquid is the state of matter in which particles are less tightly bound as compared to solids as they have weak inter molecular forces as compared to solids.

Thus when a solid is heated, the molecules start moving in random motion due to an increase in the kinetic energy. The molecules move apart as the forces will be weak and thus less molecules will be present per unit volume. Thus it will become less dense.

Answer:

naclo4+koh naoh+kclo4

Explanation:

if you know your cemestry

Answer:

it's A

Explanation:

A convergent boundary is a type of tectonic boundary where two plates of the Earth's lithosphere move towards each other and collide, resulting in the deformation and destruction of the plates. This type of boundary can occur between two continental plates, between an oceanic plate and a continental plate, or between two oceanic plates.

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Answer:

4

Explanation: it's a carbon atom right....soo it'll form 4 bonds(single)

An atom can form 4 single covalent bonds is carbon with two electron shell.

The bonds are defined as a strong bond that binds atoms, ions, or molecules together and promotes the production of molecules.

There are three types of bonds.

Covalent bonds are defined as the bond formed by sharing of electrons with each other.

Covalent bonding is a stable equilibrium of the attractive and repulsive forces between two atoms that occurs when they share electrons. Bonding pairs or sharing pairs are other names for these electron pairs.

It can also be defined as a type of chemical link where atoms share electrons to create electron pairs.

Covalent bonds  has low melting point, boiling point, enthalpy of fusion and enthalpy of vaporization.

Thus, an atom can form 4 single covalent bonds is carbon with two electron shell.

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Answer:

yes

Explanation:

because density is determined by an objects mass and volume

Answer:

approx 17.1429 days rounded up = 18days

Explanation:

400÷70 =5.7143 × 3 = 17. or rounded up = 18days

Answer:

4

Explanation: on the left side of the equation there are 4 carbons, to make 4 carbons on the right side of the equation you need 4 of the CO2 molecules.

Answer:

13.75

Explanation:

Density is equal to mass divided by volume. 110/8 = 13.75

The total heat that is required to produce the solid  is obtained as 34.8 kJ.

We know that the energy of the substance can be defined as the ability to do work. In this case, energy has been supplied to the system as the heat that is supplied to the substances.

There are stages that the objects would have to go through and in all these stages we have heat that is evolved or absorbed.

As the object cools from  120.9 °C to  87.9 °C

H = mcdT

m = mass of the object

c = specific heat capacity

dT = temperature change

H = 221.6 g *  1.5 J/g·°C * (87.9 °C - 120.9 °C)

H = -10,969 J or 10.969 kJ

As it is converted from gas to liquid;

H = 221.6 g/75 g/mol * 34.6 kJ/mol

H = 2.95 mol *  34.6 kJ/mol

H = 102.1 kJ

As the liquid cools from 87.9 °C to  -30.9 °C

H = 221.6 g * 2.4 J/g·°C * ( -30.9 °C - 87.9 °C)

H = -63.2 kJ

As the liquid changes to solid;

H =  221.6 g/75 g/mol * 6.3 kJ/mol

H = 2.95 mol * 6.3 kJ/mol

H = 18.6 kJ

As the solid cools further to  -61.9°C

H = 221.6 g * 4.9 J/g·°C * (-61.9°C - (-30.9 °C))

H = -33.7 kJ

Total heat involved;

10.969 kJ + 102.1 kJ - 63.2 kJ + 18.6 kJ - 33.7 kJ

= 34.8 kJ

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There are approximately 3.8 x \(10^{6}\) g of Sodium Chloride in 65 liters of the solution.

The number of grams of NaCl in 65 liters of a solution can be determined by using the concentration of the solution. Since the concentration of NaCl is not given, it's not possible to determine the exact number of grams of NaCl in 65 liters of the solution.

However, if we assume that the solution is an aqueous solution of NaCl, we can make an estimate using the density of water. The density of water is approximately 1 g/mL, so 65 liters of water is approximately 65 × 1000 = 65000 mL of water. This means that if the concentration of NaCl in the solution is 1 M, then there would be 65000 mL × 1 M = 65000 moles of NaCl in the solution. Since the molar mass of NaCl is 58.44 g/mole, this would correspond to 65000 moles x 58.44 g/mole = 3.80 × \(10^6\) g of NaCl.

This is a rough estimate, and the actual number of grams of NaCl in 65 liters of solution would depend on the actual concentration of NaCl in the solution. However, if we use 2 significant figures, we can estimate that there are approximately 3.8 × \(10^6\) g of NaCl in 65 liters of the solution.

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The freezing point of the solution is -11.8 °C.

The boiling point of the solution is 103.31 °C.

To determine the freezing point of the solution, we can use the equation:

ΔTf = Kf * m

where:

ΔTf is the freezing point depression,

Kf is the cryoscopic constant (for water, Kf = 1.86 °C/m),

m is the molality of the solution (moles of solute per kilogram of solvent).

First, let's calculate the molality (m) of the solution:

Molar mass of ethylene glycol (C2H6O2):

C = 12.01 g/mol

H = 1.01 g/mol (x 6) = 6.06 g/mol

O = 16.00 g/mol (x 2) = 32.00 g/mol

Total molar mass = 12.01 g/mol + 6.06 g/mol + 32.00 g/mol = 50.07 g/mol

Number of moles of ethylene glycol (C2H6O2) = mass / molar mass

Number of moles = 30.8 g / 50.07 g/mol = 0.615 mol

Mass of water = volume x density = 96.6 mL x 1.00 g/mL = 96.6 g

Now, let's calculate the molality:

Molality (m) = moles of solute / mass of solvent (in kg)

Molality = 0.615 mol / 0.0966 kg = 6.36 mol/kg

Now we can calculate the freezing point depression (ΔTf):

ΔTf = Kf * m

ΔTf = 1.86 °C/m * 6.36 mol/kg = 11.8 °C

To find the freezing point of the solution, subtract the freezing point depression from the freezing point of pure water (0 °C):

Freezing point = 0 °C - 11.8 °C = -11.8 °C

To determine the boiling point of the solution, we can use the equation:

ΔTb = Kb * m

where:

ΔTb is the boiling point elevation,

Kb is the ebullioscopic constant (for water, Kb = 0.52 °C/m),

m is the molality of the solution (same value as calculated before: 6.36 mol/kg).

ΔTb = 0.52 °C/m * 6.36 mol/kg = 3.31 °C

To find the boiling point of the solution, add the boiling point elevation to the boiling point of pure water (100 °C):

Boiling point = 100 °C + 3.31 °C = 103.31 °C

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Answer:

Explanation: It’s the correct answer on Edmentum.