Which compound in each pair is more soluble in water?(b) Strontium carbonate or cadmium sulfide

If we had used 4 grams of NaOH instead of 2 grams, the heat gained by the solution would have been higher.

The term enthalpy has to do with the heat that could be emitted or evolved in a given reaction. We know that in a neutralization reaction, there is an evolution of heat and as such the reaction  vessel would feel warm at the end of the reaction.

Also, the enthalpy would depend on the amount of the limiting reactant. In this case, the limiting reactant would be the sodium hydroxide and as such the enthalpy would affected by a change in the amount of the sodium hydroxide.

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Answer:

27 grams

Explanation:

mass = density × volume

(A) R_r represents the rate of change of resistance with respect to the radius of the artery, r. The units of R_r are mmHg/mm. A negative value for R_r indicates that an increase in the radius of the artery will result in a decrease in resistance, meaning it becomes easier for blood to flow through the wider artery.

(b) The derivative is zero because the resistance with respect to the radius does not depend on the length of the artery.

(a) To calculate R_L (L, r), we differentiate the equation with respect to L while keeping r constant:

\(R_L(L, r) = d/dL (kL/r^4) = k/r^4\)

R_L represents the rate of change of resistance with respect to the length of the artery, L. The units of R_L are mmHg/cm. A positive value for R_L indicates that an increase in the length of the artery will result in an increase in resistance, meaning it becomes harder for blood to flow through the longer artery.

To calculate R_r (L, r), we differentiate the equation with respect to r while keeping L constant:

\(R_r(L, r) = d/dr (kL/r^4) = -4kL/r^5\)

R_r represents the rate of change of resistance with respect to the radius of the artery, r. The units of R_r are mmHg/mm. A negative value for R_r indicates that an increase in the radius of the artery will result in a decrease in resistance, meaning it becomes easier for blood to flow through the wider artery.

(b) To calculate R_rr (L, r), we differentiate R_r (L, r) with respect to r while keeping L constant:

\(R_rr(L, r) = d/dr (-4kL/r^5) = 20kL/r^6\)

R_rr represents the rate of change of R_r with respect to r. The units of R_rr are mmHg/mm^2. A positive value for R_rr indicates that as the radius of the artery increases, the rate of decrease in resistance increases. In other words, the wider the artery becomes, the easier it is for blood to flow through.

To calculate R_rL (L, r), we differentiate R_r (L, r) with respect to L while keeping r constant:

\(R_rL(L, r) = d/dL (-4kL/r^5) = 0\)

R_rL represents the rate of change of R_r with respect to L. The units of R_rL are mmHg/(cm·mm). The derivative is zero because the resistance with respect to the radius does not depend on the length of the artery. This implies that changes in the length of the artery do not affect the rate of change of resistance with respect to the radius.

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Answer:

D Sunlight

Explanation:

Hoped that helped :)

The laboratory reported that the unknown sample was most likely a pure substance or an element.

When a sample cannot be decomposed by physical or chemical means, it indicates that the sample is most likely a pure substance or an element. physical means of decomposition involve processes like heating, cooling, or applying pressure, while chemical means involve reactions with other substances.

In this case, since the unknown sample could not be decomposed by either physical or chemical means, it suggests that the sample is not a mixture of different substances. Instead, it is likely a pure substance or an element.

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Answer:

Kg/ ml

Explanation:

Hope I help you

thank you

Answer:

89.3 %

Explanation:

M(CH4) = 12+ 4*1 = 16 g/mol

M(O2) = 2*16 = 32 g/mol

M(CO2) = 12 + 2*16 = 44 g/mol

8.50 g * 1 mol/16 g = 0.5313 mol CH4

15.9 g * 1 mol/32 g = 0.4969 mol O2

9.77 g * 1 mol/44 g = 0.2220 mol CO2

1)                                  CH4        + 2O2 -----> CO2 + 2H2O

from reaction             1 mol          2 mol

given                       0.5313 mol   (0.4969 mol)

1 mol CH4              --- 2 mol O2

0.5313 mol  CH4  --- x mol O2

x= 2*0.5313 = 1.0626 mol O2

We can see that for given amount of CH4 we do not have enough O2, so O2 is a limiting reactant.

2)                               CH4        + 2O2 -----> CO2 + 2H2O

from reaction                             2 mol        1 mol

given                                      0.4969 mol   x mol

x = 0.4969*1/2 = 0.2485 mol CO2 theoretical yield

3)

Practical yield CO2 = 0.2220 mol

Theoretical yield CO2 = 0.2485 mol

% yield = (0.2220/0.2485)*100% = 89.3 %

As bond order decreases in  b2, c2 and p2 but increases in f2, 3 of them will decrease bond order.

Bond order is defined in chemistry by Linus Pauling as the difference between the number of bonds and anti-bonds. The number of electron pairs (covalent bonds) between two atoms is the bond order.

For example, the bond order between the two nitrogen atoms in diatomic nitrogen NN is 3. (triple bond). The bond order between the two carbon atoms in acetylene is also 3, and the C-H bond order is 1. (single bond).

The bond order between carbon and oxygen in carbon monoxide CO+ is three. The bond order between sulphur and nitrogen in thiazyl trifluoride NSF3 is 3, while the bond order between sulphur and fluorine is 1. The bond order in diatomic oxygen O=O is 2 (double bond).

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2 Bond Order Reduction Elements are always made up of just one type of atom, however molecules can include only one type of atom if one electron is removed from the neutral molecule.

Definition of a molecule

The smallest unit of a substance that retains its composition and properties is a molecule. It is constructed of two or more atoms connected by chemical bonds. Moles are the foundation of chemistry.

Is a molecule an ionic bond?

A molecule, which is a grouping of three or more atoms, is the largest recognized unit into which a pure substance may be divided while keeping its makeup and chemical reactivity.

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The pillar of sustainability broken by recycling electronics in India is environmental sustainability. Implementing a law that restricts electronics recycling to the US would not necessarily be the most effective solution, as it overlooks the complex global dynamics of electronic waste management.

Recycling electronics in India often involves improper disposal methods, such as burning or dismantling without proper safety measures. This leads to environmental pollution, including the release of hazardous substances into the air, soil, and water, thus violating the principle of environmental sustainability.

However, simply mandating that electronics can only be recycled in the US may not be the most optimal solution. Electronic waste is a global issue, and restricting recycling to a single country disregards the fact that electronic products are manufactured and consumed worldwide. A more comprehensive approach to addressing electronic waste would involve international cooperation, strict regulations, and monitoring of recycling practices to ensure they meet environmental standards.

Efforts should focus on improving recycling practices globally, including promoting responsible electronic waste management, developing sustainable recycling infrastructure in multiple countries, and encouraging the adoption of safe and environmentally friendly recycling practices. This approach would foster global sustainability and address the challenges associated with electronic waste disposal more effectively than a geographically limited restriction.

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The compound which contains  an alkaline earth metal and a halogen is CaCl₂.

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:

1)Molecular compounds where in atoms are joined by covalent bonds.

2) ionic compounds where atoms are joined by ionic bond.

3)Inter-metallic compounds where atoms are held by metallic bonds

4) co-ordination complexes where atoms are held by co-ordinate bonds.

They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.

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360.87g of sodium reacted with 497g of chlorine to form 819g of sodium chloride (NaCl).

Chlorine and sodium react to form sodium chloride (NaCl). Below is the balanced reaction:

Cl2 + 2Na = 2NaCl.

1 mole of Na interacts with 1 mole of Cl2 to create 2 moles of NaCl. Sodium's atomic mass is 23 and chlorine's molar mass is 71, while sodium chloride's molar mass is 58.5.

As a result, the reaction between 46g Na and 71g Cl2 yields (2 X 58.5)g = 117g of NaCl.  Na fully interacts in response to the question, indicating Na as the limiting reactant. Thus, the amount of Na that reacts is equal to the amount of NaCl that is created.

Produced NaCl = 819g = (819/58.5) moles = 15.69 moles. The amount of Na that reacted was 15.69 moles = 15.69 X 23g = 360.87g.

Result:

Amount of Na reacted is 360.87g.

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Answer:

c.

earthquakes along the fault were more frequent in the south than in the north

Heliocentric model of the solar system state the sun is assumed to lie at or near a central point and the earth and other bodies revolve around it.

Heliocentrism is the astronomical model developed by Nicolaus Copernicus and published in 1543 and this model postulate that the sun at the center of the universe with Earth and the other planets orbiting around it in circular paths and main heliocentric means earth revolve around the sun is called as heliocentric theory

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Wine was produced 37 years ago (1984 as usual year 15,2021) that is shown in the calculations below.

Reaction rate is calculated using the formula rate = Δ[C]/Δt, where Δ[C] is the change in product concentration during time period Δt. The rate of reaction can be observed by watching the disappearance of a reactant or the appearance of a product over time.

The time can be represented as follows:

t= 2.303\∧ log A0/A

∧= 0.693/t 1/2

The rate of a reaction is proportional to the reciprocal of the time taken. Rate α 1 time Rate is inversely proportional to time. Units: s-1, min-1 etc.

The given parameters are as follows:

t1/2=12.3

A0=5.5

A=0.688

t= 2.303/(0.693/12.3) log (5.5/0.688)

t=36.9

t=37 years

Thus, wine was produced 37 years ago (1984 as usual year 15,2021)

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When, pH of the resulting solution is 2.41. Then, the Ka for the weak acid is 1.75 × 10⁻⁴.

The first step is to set up the balanced equation for the ionization of the weak acid;

HA + H₂O ⇌ A⁻ + H₃O⁺

Next, write out the expression for the acid dissociation constant, Ka;

Ka = [A⁻][H₃O⁺] / [HA]

Since the concentration of the weak acid is given as 0.0194 M, we can assume that the initial concentration of HA is 0.0194 M. Let x be the concentration of H₃O⁺ ions and A⁻ ions formed when the acid dissociates.

HA + H₂O ⇌ A⁻ + H₃O⁺

Initial; 0.0194 M 0 0

Change; -x +x +x

Equilibrium; 0.0194 - x x x

We know that the pH of the solution is 2.41, so we can use the pH expression to find the concentration of H3O+ ions:

pH = -log[H₃O⁺]

2.41 = -log[H₃O⁺]

[H₃O⁺] = \(10^{(-2.41)}\)

= 6.43 × 10⁻³ M

Substitute the equilibrium concentrations into the Ka expression and solve for Ka;

Ka = [A-][H₃O⁺] / [HA]

Ka = (x)(6.43 × 10⁻³) / (0.0194 - x)

Since the weak acid is monoprotic, the concentration of A⁻ ions formed will be equal to the concentration of H₃O⁺ ions formed;

x = [A⁻] = 6.43 × 10⁻³ M

Substitute this value of x into the Ka expression and solve for Ka;

Ka = (6.43 × 10⁻³)² / (0.0194 - 6.43 × 10⁻³)

Ka = 1.75 × 10⁻⁴

Therefore, the Ka for the weak acid is 1.75 × 10⁻⁴.

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Answer

27.59 is the answer

Answer:

I love Science anyways

The ans is in the picture with the  steps how i got it

(hope this helps can i plz have brainlist :D hehe)

Explanation:

Answer:

C. newton's third law of motion

Explanation:

as newton's third law of motion states that every action has a reaction that is equal in size, opposite in direction, and acts simultaneously.

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:

Its is the product.

Explanation:

According to Rutherford's nuclear theory, the number of negatively charged particles outside the nucleus is equal to the number of positively charged protons inside it.

What is Rutherford's nuclear theory?

According to the Rutherford atomic theory, an atom is made up of a compact, dense, positively charged nucleus that is around by smaller, negatively charged particles called electrons. It explains the atomic model, according to which an atom's mass is concentrated in its nucleus, around which the electrons, or negatively charged particles, move.

In accordance with Rutherford's nuclear theory, an oxygen atom has 8 protons and 8 electrons, whereas a calcium atom cannot have 20 protons and 20 electrons. This is because the number of negatively charged particles outside the nucleus is equal to the number of positively charged particles inside the nucleus.

Thus, the number of negatively charged electrons outside the nucleus is equal to the number of positively charged protons inside the same.

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About 0.0288 g of HCl is required to b added to 500 grams of distilled water to make a solution of pH 2.8.

To find the amount of HCl to be added in distilled water, we follow these steps,

Step 1: Calculate the concentration of H⁺ ions in the solution using the pH.

pH = -log[H⁺]

2.8 = -log[H⁺]

[H⁺] = 1.58 × 10⁻³ M

Step 2: Write the balanced chemical equation for the dissociation of HCl in water and determine the mole ratio of HCl to H⁺ ions.

HCl + H₂O → H₃O⁺ + Cl⁻

The mole ratio of HCl to H⁺ ions is 1:1.

Step 3: Calculate the moles of H⁺ ions in the solution.

moles of H⁺ = [H⁺] × volume of solution

moles of H⁺ = (1.58 × 10⁻³ M) × 0.5 L

moles of H⁺ = 7.90 × 10⁻⁴ mol

Step 4: Calculate the moles of HCl needed to produce the desired amount of H⁺ ions.

moles of HCl = moles of H⁺

moles of HCl = 7.90 × 10⁻⁴ mol

Step 5: Calculate the mass of HCl needed using its molar mass.

mass of HCl = moles of HCl × molar mass of HCl

mass of HCl = (7.90 × 10⁻⁴ mol) × (36.46 g/mol)

mass of HCl = 0.0288 g

Therefore, approximately 0.0288 g of HCl needs to be dissolved in 500.0 mL of distilled water to create a solution with a pH of 2.8.

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Complete question - How much HCl (in grams) needs to be dissolved in 500.0 mL of distilled water to create a solution with a ph of 2.8.

535,525.7  tons of co2 emissions were avoided by using the electricity from the solar panels.

Electricity Generated = 1.26 GWh

1 GWh = 1,000,000 KWh

So electricity generated = 1,260,000 kWh

Carbon Footprint = 937 lbs/kWh

So total carbon emmisions saved by solar panels in lbs

= 937 lbs × 1,260,000

= 1,180,620,000 lbs

1 ton = 2204.6 lbs

So CO2 emissions avoided

= 1,180,620,000 lbs/2204.6 lbs

= 535,525.7 tonnes

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Answer:

1-bromo-6-chloro-5-methylheptane

Explanation:

There are 3 substituents, 1 chlorine, 1 bromine, and 1 methyl group.

The longest carbon chain consists of 7 carbons.

There are no double bonds, based on the saturation and substituents.

So you have a 1-bromo-6-chloro-5-methylheptane.

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mass of Aluminum produced = = 2.647 kg

moles of Oxygen = 73.53 moles

Given

5.0 kg Al₂O₃

Required

moles of Oxygen

Solution

The aluminum oxide gets decompose into aluminum and oxygen gas.

Reaction :

2Al₂O₃(s)⇒ 4 Al(s) + 3O₂(g)

mol of Al₂O₃(MW=102 g/mol) :

= mass : MW

= 5000 g : 102 g/mol

= 49.02 moles

From the equation, mol ratio of Al₂O₃ : O₂ = 2 : 3, sol mol O₂ :

= 3/2 x mol Al₂O₃

= 3/2 x 49.02

= 73.53 moles

mol Al :

= 4/2 x mol Al₂O₃

= 2 x 49.02

= 98.04 moles

Mass Al :

= mol x Ar Al

= 98.04 x 27 g/mol

= 2647.08 g

= 2.647 kg

Answer:

Aluminum :)

Explanation:

Answer:

78.4°C

Explanation:

Boiling point does not depend on the mass of the substance present, only the heat content is a function of the mass or volume of the substance in consideration. If there is 1000 ml of ethanol and it boils at 78.4°C, a 100 ml sample too should boil at the same temperature of 78.4°C.

Take into account these initial-rate measurements for the reaction given by K has a value of 6.6 s-1.

Chemical Response: Chemical reactions are the processes by which a substance or substances change chemically to create a new substance or substances with entirely new attributes. Products are completely distinct in nature and identity from reactants.

A physical response is a reaction that modifies the physical characteristics of an item or material Determinants of physical attributes include things like volume, mass, and density. The definition of a physical reaction is a response in which molecules rearrange one another but do not undergo chemical change.

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Consider these observations of the starting rate for the reaction for which K gives a score of 6.6 s-1.

Chemical Reaction: Chemical reactions are now the mechanisms by which a material or substances undergo chemical modification to produce a new substance or compounds with wholly new properties. Products are wholly different from reactants in nature and identity.

A physical response is a reaction that modifies the physical characteristics of an item or material Determinants of physical attributes include things like volume, mass, and density. A physical reaction is defined as an action in which ions rearrange one another without experiencing a chemical change.

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If 120 cm³ of oxygen gas is collected at 713.3 mm Hg pressure, the volume of the dry gas at STP is 0.102 cm³.

To solve this problem, we will use the ideal gas law, which relates the pressure, volume, temperature, and number of moles of a gas:

PV = nRT

First, we need to convert the given conditions to the correct units. The temperature is already in Celsius, so we need to convert it to kelvins by adding 273.15:

T = 27 + 273.15 = 300.15 K

The pressure is given in millimeters of mercury (mm Hg), so we need to convert it to atmospheres (atm) to use in the ideal gas law. There are 760 mm Hg in 1 atm, so:

P = 713.3 mm Hg / 760 mm Hg/atm = 0.938 atm

Next, we can use the ideal gas law to find the number of moles of oxygen gas:

n = PV/RT = (0.938 atm)(120 cm³)/(0.08206 L·atm/(mol·K))(300.15 K) = 0.00454 mol

Finally, we can use the molar volume of a gas at STP (standard temperature and pressure) to find the volume of the dry gas at STP. At STP, the temperature is 273.15 K and the pressure is 1 atm. The molar volume of a gas at STP is 22.4 L/mol, so:

V = n(22.4 L/mol) = (0.00454 mol)(22.4 L/mol) = 0.102 cm³

Therefore, the volume of the dry gas at STP is 0.102 cm³.

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A value of k near 1 indicates that at equilibrium, significant quantities of both products and reactants are present.

The equilibrium constant, k, is a measure of the ratio of the concentrations of the products to the reactants at equilibrium. When the value of k is close to 1, it means that the concentrations of the products and reactants are roughly equal, and therefore significant quantities of both are present. This also indicates that the forward and reverse reactions occur at a moderate rate, neither too fast nor too slow. Therefore, it is unlikely that only reactants or only products are present at equilibrium.

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