Which temperature in Celsius (°C) does this
thermometer show?
-8°
Ο°
Ο Ο Ο Ο
25°
Ο 32°

Explanation:

Difference between pulley and wheel and axle are:

pully = A pulley is a circular disc that has a groove around the circumference over which a rope or string can move. In the pulley, load is connected to one end of the rope and effort is applied on the other ends . The pulley that does not move up and down is called the fixed pulley.

Wheel and axle= Wheel and axle consists of two cylinders of different radii. The cylinder of large radius is called wheel and the cylinder radius is called axle . Both wheel and axle move together under the application of effort.

I have send you a photo of wheel and axle, pulley.

I hope it will help you so.

Answer:

Electrons

Explanation:

Atoms can combine together and share electrons between them. Atoms that share electrons are linked to each other in a form, called a molecule that is in a lower energy state than either of the separate atoms alone.

Pls Brainliest! It would mean a lot! ;)

Answer:

Fishes undergo both asexual and sexual mode of reproduction with majority of fishes reproducing by sexual mode

Explanation:

Fishes undergo sexual reproduction. The sperm from the male fuses with the eggs of females. Some of the fishes have separate female and male sexes while some are hermaphrodites and have both testes and ovaries. Some species of fishes reproduce through parthenogenesis in which female egg develops into baby fishes without fusing with a sperm cell. Due to this, the offspring are exact copies of their mothers

I believe that the answer is C

If the hydrogen gas is combusted and produces 645L of water vapor at 400 kelvin and 1.75 atm, 2796.96 g mass of the zinc is produced .

Using the ideal gas law equation:

PV = nRT

n = (PV) / (RT)

= (1.75 atm * 645 L) / (0.0821 atm·L/(mol·K) * 400 K)

= 42.71 moles

the balanced equation for the reaction between zinc and hydrochloric acid:

Zn + 2HCl -> \(ZnCl_{2}\)  + \(H_{2}\)

1 mole of zinc produces 1 mole of hydrogen gas. Therefore, the moles of zinc are also 42.71.

The molar mass of zinc is 65.38 g/mol.

Mass of zinc = moles of zinc * molar mass of zinc

= 42.71 moles * 65.38 g/mol

= 2796.96 g

Therefore, the mass of the zinc is 2796.96 grams.

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The amine that has the given spectroscopic data is N,N-dimethylisopropylamine. To identify the amine, we will analyze the provided 1H NMR and 13C NMR data.

1H NMR:
- 1.15 ppm (9H singlet): This indicates three methyl groups (\(CH_{3}\)) present in the molecule, each contributing three protons.
- 1.41 ppm (2H broad singlet): This indicates a methylene group (\(CH_{2}\)) attached to a nitrogen atom (amine group).
13C NMR:
- 32.6 ppm: This corresponds to a carbon that is attached to the nitrogen atom (amine) and is part of the methylene group (\(CH_{2}-N\)).
- 47.4 ppm: This corresponds to the carbon that has three methyl groups (\(CH_{3}\)) attached to it.
Taking these pieces of information together, we can deduce the structure of the amine: N,N-dimethylisopropylamine. This molecule has one \(CH_{2}-N\) group, with the nitrogen atom bonded to two methyl groups and a central carbon atom connected to three methyl groups.
Based on the provided 1H NMR and 13C NMR spectroscopic data, the amine in question is N,N-dimethylisopropylamine.

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The given redox reaction is:

Cr2O7^2- + C2H4O → C2H4O2 + Cr3+

To balance this reaction, we first balance the oxygen atoms by adding H2O on the right side of the equation. The number of H2O molecules added depends on the number of oxygen atoms needed. In this case, we need three O atoms on the right side, so we add three H2O molecules to the right side of the equation:

Cr2O7^2- + C2H4O → C2H4O2 + Cr3+ + 3H2O

Next, we balance the hydrogen atoms by adding H+ ions on the left side of the equation. The number of H+ ions added depends on the number of hydrogen atoms needed. In this case, we need eight H atoms on the left side, so we add eight H+ ions to the left side of the equation:

Cr2O7^2- + C2H4O + 8H+ → C2H4O2 + Cr3+ + 3H2O

Finally, we balance the charge by adding electrons. The number of electrons added depends on the difference in charge on the left and right side of the equation. In this case, the left side has a charge of -2 (from the Cr2O7^2- ion), while the right side has a charge of +3 (from the Cr3+ ion). This means that we need to add 5 electrons to the left side of the equation to balance the charge:

Cr2O7^2- + C2H4O + 8H+ + 5e- → C2H4O2 + Cr3+ + 3H2O

Therefore, the coefficient for water molecules in the balanced version of the given redox reaction is 3.

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Answer:

answer is option a..............

Answer:

I'm assuming you're talking about something like a regular housekey, in which case there are numerous things you can describe!

Its mass: how much it weighs, times the gravity of the system.

Its color: is it silver-colored, or gold, etc.?

Its volume: you could probably calculate this, though it would be hard because it's not a traditional shape, I assume.

Its density: this is mass/volume. It means how many of the atoms are in a given space; how tightly packed the atoms are.

Its tendency to rust / its specific combination of metals or alloys: is it made of copper, tin, steel.. and these are all things that can rust to varying degrees.

Answer:

A is the answer.

Explanation:

Answer:

It has a lot of matter

plz mark brainliest

They include the folowing;

1. The break-up of firm particles = Endothermic heat absorbing process

2. The break-up of solute fragments = Endothermic heat arresting process

3. The joining of solute and solvent particles = Exothermic heat bearing process

The Enthalpy of Resolution maybe found in this manner including three elements: ΔHsoln = ΔH1 + ΔH2+ ΔH3

1. Break-up of the solute molecules from each one (extending the solute), this is an endothermic response. (ΔH1)

2. Break-up of the financially sound molecules from each one (extending the solid fragments), this is also an endothermic backlash (ΔH2)

In their divided states, the solute and fit fragments are free to attract each one liquid.

3. The exothermic response of the solute and fit resulting in the composition of the resolution. (ΔH3)

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Answer:

27 °C

Explanation:

Applying,

V/T = V'/T'................. Equation 2

Where V = Initial volume of oxygen, T = Initial temperature, V' = Final volume of oxygen, T' = Final temperature.

Make T' the subject of the equation

T' = V'T/V................ Equation 2

Form the question,

Given: V' = 600 mL, V = 460 mL, T = -43°C = (-43+273) = 230K

Substitute these values into equation 2

T' = (600×230)/460

T' = 300 K

T' = (300-273) °C

T' = 27 °C

Answer:

Im going to say sleep

Explanation:

Frictional force between two objects can be increased by:

i) making the surfaces rough

ii) increasing the mass of the object that ks moving.

Hope it helps you.

Answer:

See Explanation

Explanation:

From the data given an argument for either reactant as limiting can be presented. The Limiting Reactant is that reactant which when consumed the reaction stops as the remaining reactant does not have any reagent to react with.    

Based on this definition, if one adds a small quantity of AgNO₃ solution to a large quantity of copper wire the interaction will spontaneously react with copper metal undergoing oxidation forming CuNO₃ followed by formation of the reduced form of silver precipitate until all of the AgNO₃ is consumed and the reaction stops. In this case, the AgNO₃ is the limiting reactant and the copper will remain in excess.      

On the other hand and based on this definition of limiting reactant, one can add a small amount of copper wire to a concentrated solution of AgNO₃ and the same reaction will spontaneously occur. However, in this reaction system the reaction would proceed until all of the copper wire is consumed (dissolved) and the reaction stops leaving an excess of unreacted AgNO₃ in solution with CuNO₃ and reduced Ag.

Problems dealing with limiting reactants require specifying the  quantities of each reactant from which identification for the limiting reactant can be specified. One simple way to ID the limiting reactant is to convert all given reactant quantities to moles followed by dividing each by its respective coefficient from the balanced rxn equation. The smaller value will be the limiting reactant.  

Gasohol is a blend of gasoline and ethanol. To determine the maximum work that can be obtained by burning 1.003 mol of C2H5OH at 25°C and 1 atm, the Gibbs free energy equation can be utilized. What is Gibbs free energy equation? Gibbs free energy equation is a thermodynamic equation that quantifies the maximum quantity of work that may be obtained during a chemical reaction. T

he equation is as follows: ΔG = ΔH - TΔSThe values of ΔH and ΔS are calculated from thermodynamic tables or by calculating the enthalpy and entropy of the products and reactants, and the temperature, T, is usually specified in Kelvin. The change in Gibbs free energy, ΔG, is the maximum amount of energy that can be obtained from the reaction in the form of useful work if the reaction takes place at constant pressure and temperature. The reaction will proceed spontaneously if ΔG is negative. And if ΔG is positive, the reaction will not take place spontaneously. The solution to this problem is shown below:

First, let's figure out how much heat is produced when one mole of C2H5OH is burnt.ΔHrxn = [2(moles of CO2)(-393.5 kJ/mol) + 3(moles of H2O)(-285.8 kJ/mol)] - [(moles of C2H5OH)(-277.7 kJ/mol)]ΔHrxn = [2(2.006 mol)(-393.5 kJ/mol) + 3(3.009 mol)(-285.8 kJ/mol)] - [1.003 mol(-277.7 kJ/mol)]ΔHrxn = -2043.5 kJ/mol. Now, we'll figure out the entropy change for the reaction.ΔSrxn = [2(moles of CO2)(213.8 J/mol-K) + 3(moles of H2O)(69.9 J/mol-K)] - [(moles of C2H5OH)(160.7 J/mol-K)]ΔSrxn = [2(2.006 mol)(213.8 J/mol-K) + 3(3.009 mol)(69.9 J/mol-K)] - [1.003 mol(160.7 J/mol-K)]ΔSrxn = -104.3 J/mol-KThe temperature in Kelvin is 25°C.273 + 25 = 298 KΔG = ΔH - TΔSΔG = -2043.5 kJ/mol - (298 K)(-104.3 J/mol-K)/1000ΔG = -2032.6 kJ/mol. Therefore, the maximum work that can be obtained by burning 1.003 mol of C2H5OH is 2032.6 kJ/mol, which is the value of ΔG.

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Answer:

It picked out for the best time for man to the earth for the earth and the earth in the moon to moon earth earth moon earth and moon earth moon and moon earth lord earth moon earth lord moon earth moon and earth moon earth lord lord moon earth moon lord moon earth lord moon lord

Explanation:

Therefore, the correct answer is Shortest 2<5<3<1<4 Longest.

The bond lengths in a molecule can be determined using the molecular formula of the molecule. Bond lengths are measured in units of length. The length of a bond between two atoms is related to the strength of the bond. This means that the length of the bond is proportional to the strength of the bond.

As a result, shorter bonds are stronger than longer bonds.

Here is the rank of the bond lengths in the following molecule from shortest to longest:

Shortest 2<5<3<1<4 Longest

Explanation:

Here is the molecular formula of the molecule given in the question. It is important to look at the structural formula to identify the bonds and their lengths.

CH3-CH=CH-CH2-COOH

The molecule consists of five carbon atoms, one of which is double bonded to another carbon atom.

There is a methyl group (CH3) attached to one of the carbon atoms, and a carboxyl group (-COOH) attached to another carbon atom.

Each carbon atom is bonded to other atoms by covalent bonds.

The strength of each covalent bond is proportional to its length, with shorter bonds being stronger than longer bonds.

The carbon-carbon double bond (C=C) is the shortest bond in the molecule.

This is because double bonds are shorter than single bonds. The bond lengths are as follows:

2. C=C (double bond)

5. C-C (single bond)

3. C-C (single bond)

1. C-C (single bond)

4. C-C (single bond)

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Answer:

The chemical formula of Tetraoxosilicate(IV) acid is H4SiO4

The given statement "scientists have reached a main milestone in learning how to reverse aging" is true because scientists have investigated that lifestyle interventions, such as proper and healthy diet, exercise and supplements can reverse aging.

Scientific studies reveal that lifestyle interventions, including diet, exercise, and supplements can reverse aging. For instance, in one of the studies, patients were put on a healthy diet, had to take particular supplements, and exercise. After 8 weeks of following this plan, their epigenetic age was reversed by almost two years.

Thus, the given statement correctly specifies that scientists have achieved a big milesotme to reduce or reverse aging.

"

Complete question

scientists have reached a key milestone in learning how to reverse aging

True

False

"

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To determine the predominant species in a solution of a hypothetical diprotic weak acid (H2A) with pKa values of 4.5 and 8.5, we need to consider the acid dissociation constants and the pH of the solution. Here's a step-by-step explanation:

1. Acid Dissociation Constants: The acid dissociation constants (Ka) represent the degree of ionization for each proton (H+) released by the acid.

2. Calculation of pH: The pH of the solution determines the concentration of H+ ions. A low pH indicates a high concentration of H+ ions, while a high pH indicates a low concentration of H+ ions.

3. Predominant Species at Low pH (Acidic Conditions): At low pH, below the first pKa value of 4.5, the acid exists mainly in the protonated form (H2A), since most of the H+ ions remain bound to the acid molecule.

4. Predominant Species between pKa values: Between the two pKa values (4.5 and 8.5), the acid exists in a mixture of protonated (H2A) and singly deprotonated (HA-) forms. The relative concentrations depend on the pH of the solution.

5. Predominant Species at High pH (Basic Conditions): At high pH, above the second pKa value of 8.5, the acid exists mainly in the doubly deprotonated (A2-) form, as the H+ ions have been released.

Therefore, the predominant species in the solution of the hypothetical diprotic weak acid (H2A) at different pH ranges are as follows:

- Low pH: Predominantly H2A

- Between pKa values: Mixture of H2A and HA-

- High pH: Predominantly A2-

Please note that the exact distribution of species will depend on the specific pH of the solution.

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The assumption built into the TWA (time-weighted average) value with regard to years of exposure is that the exposure to the content loaded in a particular environment is spread out over a working career, which typically spans around 30 years.

Therefore, the TWA value is based on an average exposure over a period of time, assuming that an individual will work in that environment for a full career length. However, it should be noted that TWA values may vary depending on the specific type of content being measured and the associated health risks.

The assumption built into the Time Weighted Average (TWA) value with regard to years of exposure is "A working career." This typically means that the TWA value is calculated based on a worker's exposure to a substance or hazard over a 40-hour work week for a duration of approximately 30 years, which is considered a standard working career.

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Answer:

There are 5.43 grams of NaOCl

Explanation:

The given percent by mass of the solute tells us that out of the 150 g of the solution, 3.62% are due solely to the solute.

In other words, the mass of the solute in the solution is:

Thus, in 150 grams of the given bleach solution, there are 5.43 grams of sodium hypochlorite.

The code for corrosion control of underground storage tank systems by cathodic protection is  B) SP0169

Petroleum products are kept in a tank farm before being distributed to end users or retail establishments. A tank farm often has extremely basic amenities. Tanks can be above or below ground, with plumbing to link them to tankers and pipelines to allow fuel to be dispensed and the tanks to be filled. Numerous tank farms are situated close to ports, rail yards, major trucking terminals, and refineries (for convenience). Moving fuel into and out of the farm is made simple by these places. Another possible location for a tank farm is alongside a pipeline that carries petroleum products. In tank farms, cathodic protection systems and grounding systems may be used for corrosion control and safety reasons, respectively.
The correct code for Corrosion Control of Underground Storage Tank Systems by Cathodic Protection is:

B) SP0169

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Answer:

Explanation:

Here, we want to select the most important information piece to determine saturation

The best way to check for this is to check the kind of bonds between the carbon atoms in the molecule

When there are double or triple covalent bonds between the carbon atoms, then, we can be sure that there is a degree of unsaturation (alkenes, alkynes)

If we have single bonds only, then the molecule is saturated

Answer:

I think it will option B it will retain enough heat

Answer:

\( \huge{ \boxed{ \boxed{0.13 \: moles}}}\)

Explanation:

The number of moles of the given mass of calcium chloride can be found by using the formula;

\( n = \dfrac{m}{M} \)

where

m is the mass in grams

M is the molar mass in g/mol

n is the number of moles

From the question

m = 14.3 g

Molar mass (M) of calcium chloride ( \( CaCl_2 \)) = 40 + (35 × 2) = 40 + 70 = 110 g/mol

\(n = \dfrac{14.3}{110} = 0.13 \\ \)

We have the final answer as