How many grams of zinc would be required to produce 9.65g of zinc hydroxide

C. reducing the amount of garbage

Building a city recycling center has several potential benefits, but the biggest long-term benefit would be reducing the amount of garbage.  By decreasing the need to haul trash to landfills, the city can lower disposal costs, reduce environmental impact, and conserve natural resources.  Additionally, it can encourage more sustainable practices among businesses and residents, further reducing waste production and improving overall environmental health.

Answer:

MethodsPart A – Preparation of reference hot or cold packsEach group had either hot packs (CaCl2) or cold packs (NH4NO3). Each hot/cold pack was prepared in 20.0mL of water. We used a beaker to consistently measure 20.0mL of water for each trial. We then placed 20.0mL of deionized water in a 100mL beaker. The initial temperature of thewater was measured. My lab partner and I added about 1.0 grams of calcium chloride for hot packs. After the calcium chloride was added, we stirred gently with the glass stirring rod until the solid dissolved. While doing so, we kept the thermometer in the solution and recorded the final temperature change. We monitored the temperature change closely and recorded the maximum temperature. Once that was recorded, we disposed of the solution and dried the glassware carefully. We repeated step 2 again, using 4.0 grams of solid and 8.0 grams of solid. Before beginning Part B, we completed results # 1-2.Part B- Preparation of desired hot or cold packAfter completing results #1-2, we used the answer from results #2 to prepare a 20.0mL hot pack that reached the desired temperature. Once, finished our results were shared on the board. On the board, we reported our data to the class for “grams of solid used” and “final temperature reached”.  

Explanation:

Answer: 714 g Al2O3

Explanation: Solution attached

First convert mass of O2 to moles

Do the mole ratio between O2 and Al2O3 from the balanced equation.

Convert moles of Al2O3 to mass using its molar mass.

In a chemical reaction, 378 grams of aluminum can react with 336 grams of oxygen to form aluminum oxide, calculated using stoichiometry based on the balanced chemical equation.

The calculation of how many grams of aluminum can react with 336g of oxygen involves using stoichiometry, a technique in chemistry to calculate amounts of reactants and products.

The balanced chemical equation given is 4Al + 3O2 ⇒2Al2O3. First, we need to find the number of moles of oxygen by dividing the given mass of oxygen by its molar mass (32 g/mol for O2, thus 16 g/mol for O). Next, using the mole ratio from the balanced equation, calculate the moles of aluminum required to react with the obtained moles of oxygen. Finally, convert the moles of aluminum to grams using the molar mass of aluminum (27 g/mol).

The process will involve these steps:

Therefore, 378 grams of aluminum can react with 336 grams of oxygen to form aluminum oxide.

Answer:

              Percentage Yield is given as,

                 %age Yield  =  Actual Yield / Theoretical Yield × 100

This shows that the %age yield is directly depending upon the actual yield. And most of the time the percentage yield is less than 100 % because of the following factors.

Impure Starting Materials:

                                           If the starting materials (reactants) are not pure then reaction will not completely form the desired product. Different by products will form which will decrease the %age yield.

Incomplete Reactions:

                                     Not all reactions go to completion. In many reactions the starting material after some time stops forming the product due to different conditions. Some reactions attain equilibrium and stop increasing the amount of product. While, in some reactions a by products (like water) formed often react with the product to give a reverse reactions. Hence, the chemistry of reactions also causes the decrease in %age yield.

Handling:

               Another major reason for decrease in yield is handling the product. Always some of the product is lost during the workup of the reaction like, taking TLC, doing solvent extraction, doing column chromatography, taking characterization spectrums. So, we can conclude that the %age yield will always be less than 100%.

Explanation:

We are given with compound C₆N₄O₁₀: mass percentage of all is :

For C = 12 x 6 /288=0.25%

For N= 14 x 4 /288=0.19%

For 0= 16 x 10/288=0.5%

The elements present are :

         Atomic mass   moles                       Simplest ratio           rounding off

C      12                        0.25/12=0.020             0.02/0.02=1           2

N       14                       0.9/14=0.06                    0.06/0.02=3         6

O       16                        0.5/16=0.03                   0.03/0.02=1.5       3

The empirical formula derived is : C₂n₆O₃

Answer:

Ductility

Explanation:

Ductility is the ability of a metal to be converted into a thin wire without  getting break and loosing its hardness. The property of Ductility of a metal allows us to make a wider use of them. Some most ductile metals are gold, silver, copper etc. whereas some of the metals with very less ductility are tungsten, steel and other alloys as they are very hard to transform into a thin wire.

A metal with less ductility can be malleable as it can have the ability to be converted into a thin sheet. Not all the metals are ductile but some of them have high ductility, some have less and some of them are non ductile.

Answer:

1- The graph provides a comparison of the different marketing strategies

2- The graph helps in selecting the best marketing strategy to improve sales

Explanation:

Hope this help

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Have a nice day!!!

Answer:  You need 2 answers:

The graph provides a comparison of the different marketing strategies.

The graph helps in selecting the best marketing strategy to improve sales.

Explanation:  I just took the test and these are correct.

Answer:

D. Ten apples cost $9

Explanation:

C, the cost in dollars of buying apples is a function of the number (n) of apples bought

C (10) = $9 implies that the cost of buying 10 apples is $9

The statement 'C (10) = 9' means that ten apples cost $9 based on the given function C which represents the cost of buying n apples.

The question is asking for the interpretation of the mathematical function C(n) = 9 when n is 10. In this case, C(10) = 9 means that the cost of 10 apples is $9. This is based on the provided function C which represents the cost of buying n number of apples. So, when n is 10, the cost is 9 dollars. This interpretation is similar to how we calculate the cost of buying fruits in chapters 8 and 9, by multiply the quantity of each fruit by the price.

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Final answer:

When a gas in a fixed-volume cylinder is heated and additional gas is added, the pressure of the gas will most likely increase due to more frequent and forceful collisions of gas molecules with the container's walls.

Explanation:

The question is about what will happen to the pressure of the gas inside a cylinder when it is heated and additional gas is added. According to the principles of gas laws, specifically the combined gas law, which is related to pressure (P), volume (V), and temperature (T) of a gas, the pressure of the gas will increase if the temperature of the gas increases while the volume remains constant.

When the number of gas molecules is increased in a fixed volume, there is less space for the molecules to move, which means they will collide with the walls of the container more frequently, leading to an increase in pressure. Additionally, heating the gas will increase the kinetic energy of the molecules, resulting in more forceful collisions and therefore an increase in pressure.

To convert from one mass (stuff A) to another (substance B), first convert A's mass to moles, then apply the mole-to-mole conversion factor (B/A).

A's mass to moles, then apply the mole-to-mole conversion factor (B/A), and then convert B's mole quantity back to grams.

There is no straightforward conversion from one substance's mass to that of another. To convert from one mass (stuff A) to another (substance B), first convert A's mass to moles, then apply the mole-to-mole conversion factor (B/A), and then convert B's mole quantity back to grams.

Find out more information about 'Conversion'.

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Answer:

D. Increasing the temperature gives the molecules more kinetic energy.

Increasing the temperature gives the molecules more kinetic energy. Hence, option D is correct.

The rate of a reaction is the speed at which a chemical reaction takes place.

Temperature is also known as the average kinetic energy of molecules.

Some atoms used to have sufficient kinetic energy to react, while others do not.

Increasing the temperature indicates that more numbers of molecules will have sufficient kinetic energy to react and reactions will take place more frequently.

Hence, increasing temperature increases the reaction rate.

Thus, option D is correct.

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Final answer:

Chemical reactions require colliding particles with sufficient energy and proper orientation at the time of collision.

Explanation:

Chemical reactions require a few conditions to occur. Firstly, the reactant particles must collide with each other. The more frequent the collisions, the faster the reaction. Secondly, the particles must collide with sufficient energy to break the old bonds. Lastly, the particles must have proper orientation at the time of the collision.

The correct response is (1) an effective collision between reacting particles. For a chemical reaction to occur, reactant particles must collide with correct energy and orientation, surpassing the activation energy.

To answer the question, let's explore the requirements for a chemical reaction to occur according to the collision theory.

Given these points, the correct choice is: (1) an effective collision between reacting particles.

Explanation:

All chemical substances has certain chemical nature that is whether it is :

Acidic

It is a substance that in water produce hydrogen ions .

Like HCl ------> H⁺ + Cl⁻

When these kind of ions are released in water , they further combine with water to form hydronium ion that is :

HCl ------> H₃O⁺ + Cl⁻

                (hydronium ion)

The bonding in them is a coordinate bond that is : A bond formed between a donor and a acceptor as in it there is no mutual sharing of electrons ,Therefore it is also called as dative bond . The structure of hydronium ion is attached below .

Bases

They are those when dissolved in water produce hydroxide ion .

That is : NaOH-------> Na ⁺    + OH⁻

Answer:

364 nm

Explanation:

The formula for the energy (E) of a photon in terms of its wavelength λ is

E = hc/λ

We can rearrange this formula to give

λ = hc/E

If E = 5.45 × 10⁻¹⁹ J, then  

[tex]\begin{array}{rcl}\lambda& = & \dfrac{6.626 \times 10^{-34} \text{ J$\cdot$s} \times 2.998 \times 10^{8}\text{ m$\cdot$ s}^{-1}} {5.45 \times 10^{19} \text{ J}}\\\\& = & 3.64 \times 10^{-7} \text{ m}\\& = & \textbf{364 nm}\\\end{array}\\[/tex]

Answer:

It is advisable to use a fresh sample and not a re-solidified one when determining melting point of a substance because when the sample is melted once, it changes its crystal lattice structure to a certain extent. This can cause it to melt at a different temperature the second time around, which will not be an accurate reading.

Explanation:

The temperature at which a substance changes state from its solid form to its liquid form is known as the melting point for that substance. At this temperature, a pure substance will have both its solid as well as liquid states existing in equilibrium with each other.

When a pure, crystalline sample is melted the first time to determine its melting point, its crystal lattice structure gets distorted to a certain extent with the rising temperature. Even if cooled and re-solidified, this original crystalline structure will not melt at the same temperature it did earlier. This is because its crystal lattice is different this time around, leading to an incorrect melting point reading.

figure B has greater mechanical advantage

Explanation:

The mechanical advantage of a machine is the ratio between the output force and the input force.

For a ramp, the (ideal) mechanical advantage of a machine is also given by the formula

[tex]MA=\frac{L}{H}[/tex]

where

L is the lenght of the ramp

H is the height of the ramp

Therefore, in order to compare the mechanical advantage of these two ramps, we have to compare their ratio L/H.

By looking at the figure, we notice that:

- Figure A has greater height H and shorter length L

- Figure B has smaller height H and longer length L

This means that the ratio L/H is larger for figure B: therefore, figure B has greater mechanical advantage.

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Yo sup??

given value=1.24 g

expected value=1.30 g

Percentage Error=(expected value-given value/expected value)*100

=(0.06/1.3)*100

=4.62 %

Hope this helps.

Final answer:

The percent error for the chemistry experiment, given the theoretical yield (accepted value) of 1.30g and actual yield (amount in the lab) of 1.24g, is calculated to be 4.62%.

Explanation:

To calculate the percent error in this chemistry experiment, we can use the formula:

The % error of the yield = | [Theoretical Yield - Actual Yield] / Theoretical Yield x 100%|

In this case, the theoretical yield (accepted value) is 1.30g, and the actual yield (amount in the lab) is 1.24g. Applying the formula:

% error = |[1.30g - 1.24g] / 1.30g x 100% |
= |[0.06g] / 1.30g x 100% |
= | 0.046154 x 100% |
= 4.62%

Therefore, the percent error for this experiment is 4.62%.

Answer:

A.The kinetic energy of water is converted by a generator into electric energy.

Explanation:

Hydroelectric plant will need a source of flowing water. Water flow to lower ground because of gravity. The gravity will convert potential energy of water that located in higher ground into kinetic energy. These flowing water will be used to move the turbin that will in turn produce electrical energy.

So, the hydroelectric plant is converting the kinetic energy of water into electric energy.

Answer: A: The kinetic energy of water is converted be a generator into electric energy.

Explanation: I took the quiz!

By dividing the percentage composition with the molar mass of that element we will get the empirical formula. Then using that empirical formula and formula mass we can find the molecular formula.

Explanation:

The chemical properties of any substance are defined obviously by the different types and relative amounts of atoms constituting its primary entities (in case of covalent compounds the primary entities are molecules and ions in the event of ionic compounds).

A percent composition of any compound gives the mass percent of each element present in the compound; in addition to that frequently it is determined experimentally and utilized to derive an empirical formula of any compound. An empirical formula mass of any covalent compound could be comparable with the molar or molecular mass of a compound to acquire a molecular formula.

Answer:

C

Explanation: Acceleration is defined as the rate of change of velocity with time i.e acceleration = velocity/time.

but velocity is defined as distance moved in one second i.e velocity = distance / time.

distance is measured in meter (m) and time in second (s), then, acceleration = m/s/s. which is meter/second² i.e m/s²

The SI unit of acceleration is meters per second squared (m/s²). It represents the rate of change of velocity per unit of time.

The SI unit of acceleration is metres per second squared (m/s²). It is a measure of how quickly an object changes its velocity. For instance, continue driving a car starting from rest, if your speed grows by 6 m/s every second, then your acceleration is 6 m/s². Here, 'metres per second' shows the velocity change and squaring it (second squared) shows the time duration over which this change occurs.

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Answer: 24 N

Explanation: solution attached:

F = ma

= 6.0 kg ( 4.0 m/s²)

= 24 N

Explanation:

Chemical reaction '

It is a reaction in which two or more substances react to form some new substance .

The substances that react are called "reactants " and the new ones that are formed are called "products ".

A + B ---> C + D

(reactants )    (products )

In a chemical reaction :

Answer:

B

Explanation: it is the correct answer

Answer:

Electron cloud

Explanation:

The electron cloud is an informal term in chemistry and physics. This region describes the negatively charged electrons in their orbit surrounding the nucleus in an atom. The nucleus has protons in it that have a positive charge on it. It is not easy to know where exactly an electron in any specific time but the electron cloud helps to know electron is moving in this specific area.

Answer:

In the study of thermochemical processes, things are viewed from the point of view of the system. A chemical reaction or physical change is endothermic if heat is absorbed by the system from the surroundings. In the course of an endothermic process, the system gains heat from the surroundings and so the temperature of the surroundings decreases. The quantity of heat for a process is represented by the letter q . The sign of  q for an endothermic process is positive because the system is gaining heat. A chemical reaction or physical change is exothermic if heat is released by the system into the surroundings. Because the surroundings is gaining heat from the system, the temperature of the surroundings increases. The sign of  q for an exothermic process is negative because the system is losing heat.

Explanation:

Patrick can use the terms exothermic and endothermic to explain changes in thermal energy. Exothermic processes release heat into the environment, like burning wood, while endothermic processes absorb heat, like melting ice.

Patrick can explain the change in thermal energy from one substance to another using endothermic and exothermic processes. An exothermic process is one in which heat is released into the surrounding environment. An example of this is the burning of wood in a fireplace where heat is given off as the wood burns, increasing the thermal energy in the room. On the other hand, an endothermic process is one in which heat is absorbed from the surroundings. An example is the melting of ice, which takes heat from the surrounding environment, reducing its thermal energy, to change from a solid to a liquid state. By using these terms, Patrick can effectively explain changes in thermal energy.

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The empirical formula is XeO₃.

Explanation:

Assume 100 g of the compound is present. This changes the percents to grams:

Given mass in g:

Xenon = 73.23 g

Oxygen = 26.77 g

We have to convert it to moles.

Xe = 73.23/   131.293 = 0.56 moles

O = 26.77/ 16 = 1.67 moles

Divide by the lowest value, seeking the smallest whole-number ratio:

Xe = 0.56/ 0.56 = 1

O = 1.67/ 0.56 = 2.9 ≈3

So the empirical formula is XeO₃.

[tex]2.4088 \times 10^{24} \text { molecules }[/tex] are there in [tex]4.00 \text { moles } C_{3} H_{6} O_{3}[/tex]

Explanation:

One mole =  [tex]6.022 \times 10^{23}[/tex] (Applicable to the substances like ions, molecules, or atoms). This specified number is called as Avogadro's constant or number. This idea helps us to convert number of moles of a substance to the number of molecules, multiply moles by Avogadro's number, [tex]6.022 \times 10^{23}[/tex]

Given:

[tex]4.00 \text { moles } C_{3} H_{6} O_{3}[/tex]

To find the number of molecules in it

By using Avogadro’s number, convert given moles into molecules as below,

         [tex]\text { 4.00 moles } C_{3} H_{6} O_{3} \times \frac{6.022 \times 10^{23} \text { molecules }}{1 \text { mole } C_{3} H_{6} O_{3}}[/tex]

By solving the above, we get

         [tex]Number of molecules of $C_{3} H_{6} O_{3}=24.088 \times 10^{23}$[/tex]

[tex]Number\ of\ molecules\ of\ C_{3} H_{6} O_{3}=2.4088 \times 10^{24}\ molecules\ C_{3} H_{6} O_{3}[/tex]

Answer:

124.26g

Explanation:

Diameter  = 1.80 , length (h) = 4.12 , density = 11.4

Density = mass / volume

Volume = area x height

Area = #d2 ➗ 4

Where #(pi) = 3.142

Area = 3.142 x 1.80 square ➗ 4

Area = 10.2/4 = 2.6

Volume = area x height

Volume = 2.6 x 4.2=10.9

Density = mass / vol

Mass = density x vol

Mass = 11.4 x 10.9

Mass 124.26g

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The significance of meiosis in living organisms is that it allows sexual reproduction to maintain the diploid chromosome number by producing haploid gametes, which upon fertilization, restore the diploid condition.

Meiosis is significant to most living organisms because it allows sexual reproduction to maintain the diploid chromosome number. In sexual reproduction, genetic material from two individuals is combined to produce genetically diverse offspring. The process of meiosis is a series of events that arrange and separate chromosomes into cells, thereby reducing the chromosome number by half to produce haploid gametes. Fertilization then involves the fusion of these haploid gametes from two individuals to restore the diploid condition in the new zygote, hence, maintaining the species' chromosome number through generations.

The correct answer to the student's question is B. allows sexual reproduction to maintain the diploid chromosome number. This answer is supported by the understanding that meiosis produces genetically unique reproductive cells, called gametes, which have half the number of chromosomes as the parent cell. When two gametes fuse, they restore the original diploid state of the organism's chromosomes.