5. A salvage operator recovered coins believed to be gold. A sample weighed 129.6 g and had a volume of 15.3 cm3. Were the coins gold (d= 19.3 g/cm3) or just yellow brass (d= 8.47 b/cm3)?

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.

The property that is different from the rest based on the categories of physical and chemical properties is Boiling point.

Boiling point is a physical property because it is associated with the phase change of a substance from liquid to gas and does not involve a change in the chemical composition of the substance. It is a characteristic of a substance that can be measured at a specific pressure and is used to identify substances.

Flammability is a chemical property because it involves a chemical reaction, specifically combustion, where the substance reacts with oxygen to produce heat and light. This reaction results in the formation of new substances with different chemical compositions.

Magnetism is considered a physical property as it pertains to the behavior of a substance in the presence of a magnetic field. It does not involve a change in the chemical composition of the material.

Thermal conductivity is also a physical property. It measures the ability of a material to conduct heat and is a characteristic that can be measured without changing the chemical identity of the substance.

In summary, boiling point, magnetism, and thermal conductivity are physical properties, while flammability is a chemical property. Boiling point is the one that is different from the rest in terms of the physical and chemical property categories

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.

molar mass of Zn is 65.38 g/mol≅65.4 g/mol

65.4 g Zn* 1 mol Zn/64.4g* (6.022*10^23) atoms/1 mol Zn

hence, there are 6.022*10^23 atoms

Answer: half as much .hope this helped

Explanation:

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.

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:

electricity

Explanation:

i took the test and got the answer right.

There can be emissions of radiations like gamma radiation. There can be emission of particles too like alpha particle. Therefore, electricity is the final outcome of a nuclear generating plant.

Nuclear decay is process in which the radioactive element releases particles or radiations. Alpha particles is ⁴₂He. Alpha particle is nothing but helium particle. the kinetics of decay of radioactive nuclear decay is of first order kinetics.

The rate law for first order kinetics is

K=(2.303/T)×log(a/a-x)

Where

k - rate constant

t - time passed by the sample

a - initial amount of the reactant

a-x - amount left after the decay process

Electricity is the final outcome of a nuclear generating plant. A nuclear power plant is a thermal power station in which we produce electricity using nuclear reactor.

Therefore, electricity is the final outcome of a nuclear generating plant.

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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⁻

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

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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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:

The sun is our main source of heat and light energy. A source is where something comes from. The heat we feel and the light we see here on Earth is mainly from our nearest star, the sun.

Explanation:

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:

B

Explanation: it is the correct answer

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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Answer: 0.14 mole C2H2

Explanation: solution attached:

Derive n from PV= nR

n= PV/RT

= 1 atm ( 3.25 L) / (0.08205 L.atm/mol.K) ( 273 K)

= 0.14 mole C2H2

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:

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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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:

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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Answer:

                     %age Yield  =  22.72 %

Explanation:

                    The balance chemical equation is as follow;

                           2 NH₄Cl + CaO → 2 NH₃ + CaCl₂ + H₂O

Step 1: Calculate Moles of CaO, NH₄Cl and NH₃;

CaO:

        Moles  =  Mass / M.Mass

        Moles  =  112 g / 56.07 g/mol

        Moles  =  1.99 moles of CaO

NH₄Cl:

        Moles  =  Mass / M.Mass

        Moles  =  224 g / 53.49 g/mol

        Moles  =  4.18 moles of NH₄Cl

NH₃:

        Moles  =  Mass / M.Mass

        Moles  =  16.3 g / 17.03 g/mol

        Moles  =  0.95 moles of NH₃

Step 2: Calculate Limiting reagent as:

According to equation.

                   2 moles of NH₄Cl reacts with  =  1 mole of CaO

So,

              4.18 moles of NH₄Cl will react with  =  X moles of CaO

Solving for X,

                     X =  4.18 mol × 1 mol / 2 mol

                     X  =  2.09 mol of CaO

This means that none of the given reagent is limiting reagent. They both are almost equal in number of moles.

Step 3: Calculate Theoretical Yield of NH₃ as;

According to equation.

                   2 moles of NH₄Cl produced  =  2 moles of NH₃

So,

              4.18 moles of NH₄Cl will produce  =  X moles of NH₃

Solving for X,

                     X =  4.18 mol × 2 mol / 2 mol

                     X  =  4.18 mol of NH₃

Step 4: Calculate Percentage Yield as;

             %age Yield  =  Actual Yield / Theoretical Yield × 100

             %age Yield  =  0.95 mol / 4.18 × 100

             %age Yield  =  22.72 %

The percent yield of a reaction is calculated by dividing the actual yield by the theoretical yield and multiplying by 100. In this case, it would involve using stoichiometry to calculate the theoretical yield of NH3 from 112 g of CaO, then dividing the actual yield of 16.3 g by the theoretical yield and multiplying by 100.

The percent yield of a reaction is calculated by taking the actual yield (the amount actually produced by the reaction) and dividing it by the theoretical yield (the amount that could have been produced under perfect conditions), then multiplying by 100 to get a percentage. In this case, we don't have the theoretical yield, but we know that 16.3 g of ammonia gas was produced from 112 g of Calcium Oxide and 224 g of ammonium chloride.

The reaction between Calcium Oxide and ammonium chloride is: CaO + 2NH4Cl -> 2NH3 + H2O + CaCl2

First, use stoichiometry to calculate the theoretical yield of NH3 from 112 g of CaO. Then, divide the actual yield by the theoretical yield, and multiply by 100 to get the percent yield.

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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.

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:

2AgNO3 + Cu = Cu(NO3)2 + 2Ag

Explanation:

This is a simple substitution reaction.

For the equation to be balanced, the total number of elements on each side of the equation must be equal.

The right hand side contains 2 nitrogen and 6 oxygen, to balance this on the left add 2 to the back of silver nitrate. Thus silver on the right hand side of the equation must be 2.

Thus the equation is balanced.

Final answer:

To balance the chemical equation for the reaction between copper and silver nitrate, ensure you have an equal number of atoms for each element on both sides of the equation, resulting in 2 AgNO3 (aq) + Cu (s) → Cu(NO3)2 (aq) + 2 Ag (s).

Explanation:

To balance the chemical equation Cu (s) + AgNO3(aq) → Cu(NO3)2 (aq) + Ag (s), follow these steps:

Identify the reactants and products to understand what symbols go on each side of the arrow and where the + signs go.

Write the correct formulas for all compounds and elements, ensuring all ionic compounds are charge balanced.

Balance the equation by ensuring the same number of atoms of each element appears on both sides of the reaction.

Here is the balanced chemical equation:

2 AgNO3 (aq) + Cu (s) → Cu(NO3)2 (aq) + 2 Ag (s)

This reaction is an example of a single replacement reaction where silver (Ag) is displaced by copper (Cu). The copper starts as a solid and is oxidized to copper (II) nitrate, while silver nitrate is reduced to solid silver. Remember that the charge conservation is important, and therefore the number of electrons and the total charge must remain equal on both sides of the equation.

Answer:

the answer is d

Explanation:

but wusup shawty

Final answer:

Among the provided options, 'A cup with steam coming from it will be hot to the touch' is an example of an inference because it is a conclusion based on the observation of steam, indicating the cup's contents are hot.

Explanation:

The question asks for the identification of an inference among four options. An inference is a conclusion reached based on evidence and reasoning rather than from explicit statements. Option d, 'A cup with steam coming from it will be hot to the touch', is an inference because it is a conclusion that one arrives at after observing steam, which suggests that the liquid inside the cup is likely hot.

Inference Examples

In the context of a joke, the question 'How many months have 28 days?' with the answer 'All of them' involves linguistic or logical inference as it plays on the expectation that people will think of February alone.

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.

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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HYDROGEN is the correct answer just test 2021