Lithium has a relative atomic mass of 7. Bromine has a relative atomic mass of 80. A compound was found to contain 16g of lithium and 183g of bromine. What is the empirical formula of this compound?

Option D: 5

IMA is Ideal Mechanical advantage, for pulley system it is equal to the number of ropes present in the system. At ideal conditions, it is equal to the number of times, input force is getting multiplied. For example, If a pulley uses two ropes, its required mechanical force to displace the load will be divided into two or the distance that should be pulled will be multiplied by two (keeping total energy constant).

In the pulley system in diagram, there are total of 5 ropes in the system that is total strand that lead directly to the load thus, IMA for this pulley system will be 5.

The answer is plastic...

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Answer:

Measuring the level of lead in drinking water is the job of an analytical chemist.

Explanation:

The work of analytical chemists is to analyse the chemical properties and nature of the substance.

They have to perform different experiments using instruments and then conclude about the nature of the sample, chemical properties of the sample, toxicology, concentration and other properties of the samples and then the analytical chemists should give a detailed report on the measurements or analysis he or she has carried out.

So the measuring of lead in drinking water forms under the measurement of toxicology of water as lead is toxic on reaction with water so it is the job of analytical chemists only.

Answer:

Definitely an analytical chemist. Because the substance has to be analyzed to look for those chemicals and toxins.

Explanation:

The saturated solution among the provided options is the one with 52g KCl in 100g water at 80 degrees Celsius, because KCl's solubility limit at this temperature is about 51g per 100g of water, and this solution marginally exceeds that amount. Hence correct option C.

To identify which option represents a saturated solution, one must refer to the solubility curves for each substance at the given temperatures. A saturated solution is one where the maximum amount of solute has dissolved in the solvent at a specific temperature. If more solute is added to a saturated solution, it will not dissolve and will remain as a precipitate. Conversely, if the amount of solute in a solution is less than the solubility limit at that temperature, the solution is considered unsaturated.

Looking at the options given by the student:

For NH₄Cl, its solubility at 50 degrees Celsius is approximately 62g per 100g of water, so if there's 40g NH₄Cl in 100g of water at 50 degrees Celsius, it is an unsaturated solution since it is less than the solubility limit.

For SO₂, its solubility at 10 degrees Celsius is much higher than 2g per 100g of water, implying that this is an unsaturated solution as well.

With KCl, the solubility at 80 degrees Celsius is about 51g per 100g of water. Since 52g KCl is mentioned, this solution is just over the saturation point, making it a saturated solution.

Lastly, KI's solubility at 20 degrees Celsius is around 140g per 100g of water, so a solution of 120g KI in 100g water is unsaturated.

Therefore, the correct answer is the one with 52g KCl in 100g water at 80 degrees Celsius, as it is the only saturated solution listed.

Answer:

B: head to tail joining of monomers

Explanation:

The element that would be a positive ion in a compound between Sr and Te would be Sr.

Elements form positive or negative ions based on the number of valence electrons their atoms contain and the tendency to either donate these electrons to form bonds or accept more electrons to form bonds.

The donation of acceptance of electrons will enable atoms to form an octet structure.

The number of valence electrons in Sr atoms is 2. In order to form an octet when bonding, these 2 electrons are readily donated rather than accepting more electrons. Thus, Sr ions are usually [tex]Sr^{2+[/tex].

The number of valence electrons in Te atoms is 6. Hence, instead of donating these electrons to form an octet, it will rather accept 2 more electrons. Thus, Te ions are usually [tex]Te^2^-[/tex].

In other words, Sr would be the positive ion in a compound.

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Final answer:

Strontium (Sr) would form a positive ion in a compound since it is an alkaline earth metal that readily loses electrons to become a cation, whereas tellurium (Te) tends to gain electrons to form an anion.

Explanation:

Between the elements strontium (Sr) and tellurium (Te), Sr would typically form a positive ion in a compound. This is because Sr is an alkaline earth metal and is found in Group 2 of the periodic table, where elements readily lose electrons to form cations with a +2 charge. On the other hand, Te is a metalloid in Group 16, known for gaining electrons to form anions with a -2 charge. Compounds are neutral, which means that the total number of positive charges must balance the total number of negative charges.

Additionally, Sr is lower down in its group than Ca, making it easier to remove an electron from Sr than from Ca. Hence, Ca has the higher ionization energy (IE) compared to Sr. When considering a potassium ion (K+), it would also be harder to remove an electron because it already has a positive charge. Therefore, the IE of K+ is significantly higher, especially since the next electron to be removed would come from a different electron shell.

Answer : The letter represents the enthalpy of reaction is, 'H'

Explanation:

Enthalpy of a reaction : Enthalpy of a reaction is defined as the energy change which takes place when the reactants go to the products.

Enthalpy of a reaction is represented as, [tex]\Delta H[/tex]. In this, 'H' represent the enthalpy.

When the enthalpy of reaction is positive that means the heat is absorbed during the reaction.

When the enthalpy of reaction is negative that means the heat is released during the reaction.

That means,  when the enthalpy of reaction is negative then the energy is released and the reaction will be exothermic reaction.

when the enthalpy of reaction is positive then the energy is absorbed and the reaction will be endothermic reaction.

Hence, the letter represents the enthalpy of reaction is, 'H'

Answer:

people walking on the sidewalk crush the calcium chloride pellets.

Explanation:

When calcium chloride pellets are crushed with feet it increases the surface area of the calcium chloride. As the surface area increase the number of collision between the reactant molecules increases. Here the reactant molecules are calcium chloride ions and water molecules. In the process of dissolution the calcium chloride ions get hydrated by the dipoles of the water molecules. As the frequency of collision increases it lowers the activation energy or threshold barriers to start a reaction.  

Answer :

D. Agrarian

Explanation:

Answer:

C. IT FLOWS THROUGH VENEZUELA

Explanation:

correct asnwer

The equilibrium associated with [tex]\text{K}_{a3}[/tex] for [tex]\text{H}_3\text{PO}_4[/tex] is as follows:

 [tex]\boxed{\text{HPO}^{2-}_{4}(aq)+\text{H}_{2}\text{O}(l)_{\rightleftharpoons}^{{K}_{a3}}\text{PO}^{3-}_{4}(aq)+\text{H}_{3}\text{O}^{+}(aq)}[/tex]

Further Explanation:

Acids are substances that can donate hydrogen ion [tex]\text{H}^{+}[/tex] or proton in their aqueous solutions.

Classification of acids:

1. Monoprotic acids

Acids that are capable to donate single proton in solutions are monoprotic acids. For example, HCl is a monoprotic acid due to its tendency to donate only one proton in solutions.

2. Polyprotic acids

Acids that are capable to donate more than one proton in aqueous solutions are called polyprotic acids. For example, [tex]\text{H}_2\text{SO}_4[/tex] and [tex]\text{H}_3\text{PO}_4[/tex] are all polyprotic acids.

Acid strength is measured with the help of dissociation constant. Itis denoted by [tex]\text{K}_a[/tex]. Since [tex]\text{H}_3\text{PO}_4[/tex] contains three hydrogens in it, it can donate three hydrogen ions in solutions so it is triprotic acid.

Dissociation of [tex]\text{H}_3\text{PO}_4[/tex] occurs as follows:

[tex]\begin{aligned}\text{H}_3\text{PO}_4(aq)+\text{H}_2\text{O}(l)_{\rightleftharpoons}^{K_{a1}}\text{H}_2\text{PO}^{-}_{4}(aq)+\text{H}_3\text{O}^{+}(aq)\\\text{H}_2\text{PO}^{-}_{4}(aq)\text{H}_2\text{O}(l)_{\rightleftharpoons}^{K_{a3}}\text{HPO}^{2-}_{4}(aq)+\text{H}_{3}\text{O}^{+}(aq)\\\text{HPO}^{2-}_{4}(aq)+\text{H}_{2}\text{O}(l)_{\rightleftharpoons}^{K_{a3}}\text{PO}^{3-}_{4}(aq)+\text{H}_{3}\text{O}^{+}(aq)\end{aligned}[/tex]  

Where,

[tex]{{\text{k}}_{{\text{a1}}}}[/tex] is the first dissociation constant of [tex]{{\text{H}}_{\text{3}}}{\text{P}}{{\text{O}}_{\text{4}}}[/tex].

[tex]{{\text{k}}_{{\text{a2}}}}[/tex] is the second dissociation constant of [tex]{{\text{H}}_{\text{3}}}{\text{P}}{{\text{O}}_{\text{4}}}[/tex].

[tex]{{\text{k}}_{{\text{a3}}}}[/tex] is the third dissociation constant of [tex]{{\text{H}}_{\text{3}}}{\text{P}}{{\text{O}}_{\text{4}}}[/tex].

The expression of [tex]{{\text{k}}_{{\text{a3}}}}[/tex] for [tex]{{\text{H}}_{\text{3}}}{\text{P}}{{\text{O}}_{\text{4}}}[/tex] is as follows:

[tex]{{\text{k}}_{{\text{a3}}}} = \dfrac{{\left[ {{\text{PO}}_4^{3 - }} \right]\left[ {{{\text{H}}_{\text{3}}}{{\text{O}}^ + }} \right]}}{{\left[ {{\text{HPO}}_4^{2 - }} \right]}}[/tex]  

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Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Equilibrium

Keywords: acids, monoprotic acid, polyprotic acid, hydrogen ions, ka3, H3PO4, acid strength, dissociation constant, first dissociation constant, second dissociation constant, third dissociation constant.

Final answer:

Coastal areas like Maryland have milder climates due to the moderation by nearby ocean water, which has a stable temperature that influences the air temperature over land. In contrast, inland areas such as Kansas and Iowa experience more extreme temperatures due to their distance from the ocean's moderating effects and greater influence from continental air masses.

Explanation:

The location of an area relative to the coast significantly influences its climate due to the effects of oceanality and continentality. Coastal Maryland, being near the Atlantic Ocean, experiences milder conditions because the temperature of ocean water remains relatively stable throughout the year, moderating the air temperature over the land. In contrast, inland areas such as Kansas and Iowa are subject to more extreme temperatures due to their distance from the ocean's moderating influence, leading to significantly warmer summers and colder winters.

Ocean water has a high heat capacity, which means it absorbs and releases heat more slowly than land, resulting in a smaller range of temperature fluctuations. This heat inertia is why coastal areas tend to have more moderated climates. For example, airflow from the ocean keeps San Francisco's climate mild and more constant throughout the year, while Salt Lake City, which is an inland city at approximately the same latitude, experiences greater temperature variation.

In summary, coastal regions are influenced by the temperature of the nearby ocean, which changes little with the seasons. This results in a milder climate with less variation between summer and winter temperatures. Conversely, inland regions are more subject to continental air masses, leading to a larger range in temperatures and more extreme seasonal conditions.

Final answer:

The potential first-order rate law is rate = k[A] or rate = k[B], and the potential second-order rate law is rate = k[A][B].

Explanation:

The potential first-order rate law for the given reaction aA + bB → cC + dD is rate = k[A] or rate = k[B]. This means that the rate of the reaction is directly proportional to the concentration of either reactant A or reactant B.

The potential second-order rate law for the given reaction is rate = k[A][B]. This indicates that the rate of the reaction depends on the product of the concentrations of both reactant A and reactant B.

The blank solution used to calibrate the spectrophotometer contains 0.2 M Fe(NO3)3 and 0.1 M HNO3 to reflect the composition of the actual samples and to maintain consistent ionic strength and acidity, leading to more accurate and reliable measurements.

When calibrating a spectrophotometer, it is preferred to use a blank solution that is reflective of the matrix of the samples being measured. In this case, the blank solution contains not just de-ionized water but also 0.1 M HNO3 and 0.2 M Fe(NO3)3 diluted accordingly. This approach is preferred because it accounts for the absorption of the solvent and any potential interaction with the analyte.

The use of HNO3 in the calibration blank maintains a consistent ionic strength and acidity as in the samples, which can affect the absorbance readings. This method reduces background noise and leads to more accurate and reliable measurements when comparing the blank to the actual samples containing Fe³+ ions.

The blank solution for calibration includes Fe(NO₃)₃  and HNO₃ to match the sample matrix, reducing calibration errors caused by matrix effects. De-ionized water fails to replicate the sample's chemical environment.

The blank solution used to calibrate the spectrophotometer is 10.0 mL of 0.2 M Fe(NO₃)₃  diluted to 25.0 mL with 0.1 M HNO₃. This solution is preferred over de-ionized water because it closely matches the matrix of the actual samples being measured, ensuring that any absorbance readings due to the matrix itself are accounted for. This reduces the possibility of matrix effects, thus providing a more accurate calibration for the spectrophotometer.  This ensures more accurate spectrophotometer readings.

De-ionized water lacks the chemical environment of the sample solutions, which could lead to calibration errors. By using a matrix-matched blank, the spectrophotometer can be properly calibrated, accounting for interactions between Fe(NO₃)₃ and HNO₃ that might affect absorbance.

The fact that 'Gravity depends on weight' is not true. Gravity doesn't depend on weight; instead, weight is actually a result of the gravitational force. Gravity does depend on mass and distance: bigger mass and closer distance result in stronger gravitational force.

The statement 'Gravity depends on weight' is NOT true about gravity. Gravity does not depend on weight; instead, it is actually the other way around - weight is the force that gravity exerts on an object. Additionally, gravity does depend on mass and distance - the larger the mass and the closer the objects, the stronger the force of gravity. However, it's important to remember that the force of gravity will not be zero except in the theoretical case where the objects are at infinite distance from one another.

Weight is actually dependent on gravity because it's the force that gravity exerts on an object. So, in this case, weight depends on gravity, not gravity on weight.

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Answer: Mass of the substance is 1.792 kg

Explanation: Density of a substance is defined as the mass contained per unit volume.

[tex]Density=\frac{mass}{volume}[/tex]

Given:

Volume = 560 ml

Density = 3.2 g/ml

[tex]Mass=Density\times volume[/tex]

[tex]Mass=3.2g/ml\times 560ml=1792g[/tex]

Mass of the substance is 1792 g or 1.792 kg.

Answer: Option (b) is the correct answer.

Explanation:

When copper wire is place into the atmosphere or anywhere then there is possibility that some oxide layer or impurity must have deposited over its surface.

So, when we sanded copper wire then these impurities get removed and copper metal gets exposed onto the surface.

Thus, we can conclude that you sanded the copper wire before burning it to make sure that copper metal was exposed on the surface of the wire.

Answer:

B. to make sure that copper metal was exposed on the surface of the wire

Explanation:

Right on Edgen.