study this chemical reaction: ca(s) zncl2(aq)zn(s)cacl2(aq) then, write balanced half-reactions describing the oxidation and reduction that happen in this reaction

Answer:

Lead

that can be found in the periodic table of elements

Explanation:

Answer:

so 0.71 g/L

Explanation:

C =n/v n= to 0.355

v= 0.500L

The concentration of Na⁺ ions in the dilutes solution of 0.500 L is 0.131 molar.

Molarity is a concertation term for solutions. Mathematically it is the ratio of no. of moles of solute to the volume of solution in liter.

Molarity = (no.of moles / volume of solution in L)

Given that the volume of NaCl is 0.185 L and have a concentration of 0.355 M. The solution is diluted to 0.500 L , then the new concentration is calculated as follows:

M1 V1 = M2V2

(0.185 L × 0.355 M) = (0.500 L × M2), where M2 have to be calculated.

M2 = (0.185 × 0.355)/0.500 = 0.131 M

The concentration of Na⁺ will be one times the concentration of NaCl. Since the no.of moles of sodium ions and chloride ions are equal there.

Therefore, the concentration of sodium ions is 0.131 M.

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Answer:

36690

Explanation:

The concentration of the solution if the absorbance of the solution at 427 nm is 0.15 and the molar absorptivity of yellow dye at 427 nm is 5.47 × 10-⁶M.

Absorbance in physics is a logarithmic measure of the amount of light that is absorbed when passing through a substance.

It is the capacity of a substance to absorb light of a given wavelength. According to this question, the absorbance of the solution at 427 nm is 0.15.

A = εmCl

Where;

C = 0.15 ÷ (27400 × 1)

C = 5.47 × 10-⁶M

Therefore, 5.47 × 10-⁶M is the concentration of the solution.

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The statement "The orbit of a comet is one of nature's cycles" is True because The orbit of a comet is a natural cycle that follows the laws of physics and determines its path around the Sun.

Comets have highly elliptical orbits that can take them far away from the Sun and then back again, following a predictable cycle that can span many years or even centuries. This cycle of orbit is a natural phenomenon that occurs due to the gravitational forces of the Sun and other celestial bodies.

Comets are celestial bodies that follow an elliptical orbit around the Sun. Their orbit is determined by the gravitational forces acting on them from the Sun and other celestial bodies, such as planets and moons. The path of a comet is predictable and follows the laws of physics, which govern the motion of all celestial bodies.

As the comet approaches the Sun, it heats up and releases gas and dust, creating a glowing tail that can be seen from Earth. This tail always points away from the Sun, due to the solar wind blowing the gas and dust particles away from the comet.

The orbit of a comet is a natural cycle that repeats itself over time. Depending on the shape and size of the comet's orbit, its cycle can span many years or even centuries. For example, Halley's Comet, one of the most famous comets, has an orbit that takes it around the Sun every 76 years. This means that it follows a predictable cycle, and astronomers can calculate when it will be visible from Earth again.

In summary, the orbit of a comet is a natural cycle that is determined by the laws of physics and the gravitational forces of celestial bodies. This cycle determines the path of the comet around the Sun and can span many years or even centuries.

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If he rubs his foot on the carpet or touches the metal doorknob it would increase his chances of being zapped.

Rubbing his feet would be friction.

Touching the doorknob would be potential energy.

Side note: I love the format for this question, was not expecting to see John Travolatge on here today >O< !!!  

Answer:

smallest is O then Se then K then Cs.

Explanation:

These trends exist. elements tend to get smaller as it completes it's shell since there is more attraction when it is complete. plus the further down the periodic table you go the bigger it is. there are more electrons which repulse each other and make it bigger.

Based on the given reaction, the standard enthalpy of reaction is the 177.8 kJ of heat absorbed when calcium carbonate decomposes under standard conditions to produce calcium oxide and carbon dioxide.

The change in enthalpy that takes place in a system when matter undergoes a certain chemical reaction and all reactants and products are in their initial states is known as the standard enthalpy of reaction (Hr).

The enthalpy of a reaction refers to the heat changes that occur in a reaction as products are formed from reactant molecules.

Under standard reaction conditions, the sum of the overall heat changes that occur, thus, is defined as the standard enthalpy of the reaction.

In the given reaction, calcium carbonate decomposes under standard conditions to produce calcium oxide and carbon dioxide with the absorption of 177.8 kJ of heat. Hence, the standard enthalpy of the reaction is =177.8 kJ.

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Answer: 0.5 g/cm^3

Density equals mass divided by volume so..

60/120 is 0.5 g/cm^3

Answer:

The waters' temp increased

Explanation:

The temperature of the water in the swimming pool has increased due to the heat from the Sun. As a result, the particles in the water are moving faster and have a higher kinetic energy than in the morning.

The reaction between cyclopropane and propene is a first-order reaction, which means that the rate of the reaction depends on the concentration of the reactant.

The rate law for this reaction is:

Rate = k[Cyclopropane]

Where k is the rate constant, and [Cyclopropane] is the concentration of cyclopropane.

To determine the time required for the concentration of propene to reach 0.100 M, we can use the integrated rate law for a first-order reaction:

ln([Cyclopropane]t/[Cyclopropane]0) = -kt

Where [Cyclopropane]t is the concentration of cyclopropane at time t, [Cyclopropane]0 is the initial concentration of cyclopropane, k is the rate constant, and t is the time.

Rearrange this mathematical statement to work out t:

t = ln([Cyclopropane]0/[Cyclopropane]t) / k

Substituting the given values into this equation, we get:

t = ln(0.500 M / 0.100 M) / 6.7 × 10⁻⁴ s⁻¹

t = 5512 seconds

Therefore, the time required for the concentration of propene to reach 0.100 M is approximately 5512 seconds, or 1.53 hours.

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Answer:

ok..............................

Statement A:- False

Statement B:- True

Statement C:- True

Statement A:- There are many molecules and atoms that are moving randomly and they collide continuously in gas medium but not every collision leds to product formation. Only that collision which has a certain energy(activation energy) can participate in product formation, so statement A is false.

Statement B:- So, according to collision Theory, for a collision to form a product the orientation of the collision must be proper. So this statement is true.

Statement C:- This statement is a combination of what we have discussed in Statement A and B, so both the things which are mentioned in the statement is required to form a product. So this statement is true.

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The balanced reaction with correct coefficients for the given chemical reaction is given as,

4Sb + 3O₂ → Sb₄O₆

H₂S + Cl₂ → S + 2HCl

Balanced chemical equations are defined as the equations that have the same number and type of each atom on both sides of the equation. The coefficients in a balanced equation must be in the simplest whole number ratio. In a balanced chemical equation mass is always conserved.

The equation Sb + O₂ → Sb₄O₆ is written after balancing as 4Sb + 3O₂ → Sb₄O₆. Therefore, its coefficients are 4 and 3.

The equation H₂S + Cl₂ → S + HCl is written after balancing as H₂S + Cl₂ → S + 2HCl. Therefore, its coefficient is 2.

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Answer:

because I want to save life

Answer:

it is a soild only

Answer:

Br-CH2-CH(CH3)2-C(Cl)H-CH(CH3)2-CHO

Explanation:

The molecule has a total of 14 carbon atoms, 13 hydrogen atoms, and 1 bromine atom. The carbon atoms are arranged in a chain with a methyl group attached to the second carbon atom, a chlorine atom attached to the third carbon atom, and two methyl groups attached to the fourth carbon atom. The fifth carbon atom has a carbonyl group attached to it.

The molecule is an aldehyde, which means that it has a carbonyl group (C=O) at the end of the chain. The carbonyl group is polar, and the oxygen atom has a partial negative charge. The hydrogen atom has a partial positive charge. This polarity makes the aldehyde group susceptible to nucleophilic attack.

The bromine and chlorine atoms are both electrophilic, which means that they have a partial positive charge. This makes them susceptible to nucleophilic attack.

The methyl groups are non-polar and do not have any significant reactivity.

The molecule is a chiral molecule, which means that it has a mirror image that is not superimposable on itself. This is because the carbon atom with the carbonyl group is attached to four different groups.

The molecule is a liquid at room temperature and has a strong odor. It is used in a variety of products, including perfumes, flavorings, and plastics.

Explanation:

\(H _{2}O _{2(aq)} →H _{2}O _{(l)} + O _{2}(g) \\ solution : 2 \: and\: 2\)

IUPAC name for the compound is 5,6 Dimethyl Heptene.

This refers to a naming based on the highest length of the carbon molecule- chains that are joined by either a single bond, continuous chain, or ring.

In IUPAC naming / Nomenclature, multiple bonds or atoms other than carbon and hydrogen are indicated by suffixes and prefixes with respect to a particular set of priorities.

Alkane= CnH2n+2

Alkene= CnH2n

Alkyne= CnH2n-2

C - Chain =7

H- Chain =14

CH₃ - bond= 2

Therefore,

n= 7

2n=14

It is an alkene hydrocarbon. The methyl group is present at the 5th and 6 chain.

Hence, the IUPAC name of the compound is 5,6 Dimethyl Heptene.

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Answer:

c

Explanation:

I just want to get to the app

Answer:

The dark colored moths blended in while the light colored moths stand out. the light moths were hunted by predators and the black moths hid from them, making the light moths rare and the dark moths common.

Explanation:

The dark colored moths can survive easily from predators whereas, light colored moths are easily trapped by the predators due to their visibility. That's why light colored moths are rare and black colored are numerous in the environment.

According to the concept of survival of the fittest those organisms which are fit to survive in the nature will live more and others will extinct. The food chain in biosphere make the balance between various organisms where higher level organisms are the fittest to survive because they consume the lower level organism for food .

Some living things have certain peculiarity that make them adapted with adverse circumstances or save them from predators. For instance, chameleons shows the camoflouge that is the ability to change its color to protect themselves.

Similarly, the black moths cannot be identified easily by predators and very hard in the dark to see them whereas light moth are visible in the night and can be easily captured by predators. That's why they are less than black moth in population.

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The correct order of the five steps of the scientific method is as follows:

State problem

Form hypothesis

Conduct experiment

Interpret data

Draw conclusion.

The scientific method is a systematic approach used by scientists to investigate and understand the natural world. The five steps of the scientific method, in their logical order, are as follows:

State problem: In this step, the scientist identifies and defines a specific question or problem to be investigated. The problem should be clear and well-defined to guide the rest of the scientific process.

Form hypothesis: A hypothesis is a proposed explanation or prediction for the problem stated in step one. It is an educated guess that can be tested through experiments and observations. The hypothesis should be based on prior knowledge and observations.

Conduct experiment: In this step, the scientist designs and performs experiments to test the hypothesis. The experiment is carefully planned and executed, and data is collected through observations and measurements.

Interpret data: Once the experiment is completed, the scientist analyzes the collected data. This involves organizing, graphing, and statistically analyzing the data to identify patterns and trends.

Draw conclusion: Based on the interpretation of the data, the scientist draws conclusions about whether the hypothesis is supported or not. The conclusions should be objective and supported by evidence obtained from the experiment.

It's important to note that while these steps are presented in a linear order, the scientific process is often iterative, with scientists revisiting and refining hypotheses, conducting further experiments, and building upon existing knowledge.

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Answer:

se hhgggggggg I no

Answer:

1) Cl

2) O

3) O

4) S

5) N

6) P

7)N

Explanation:

Mass ratio of Tristearin that react according to the reaction : \(NaOH\) is

20 : 27

The main fat in beef is tristearin. A molecule of glycerine that has interacted with three (3) molecules of the fatty acid stearic acid is known as a triglyceride.

1 mole of Tristearin requires 3 moles of \(NaOH\) to react to give 1 mole of glycerol & 3 moles of sodium sterate.

Molar ratio of reactant Tristearin : \(NaOH\) = 1 : 3

Molar weight of Tristearin = 891.5 g/mol

=> 20 g Tristearin = \(\frac{20}{891.5} moles\)

=> \(NaOH\) required to react with \(\frac{20}{891.5}\) moles of Tristearin = \(3\times\frac{20}{891.5} moles\) = 0.0673 moles

=> Molecular weight of \(NaOH\) = 40 g/mol

=> \(NaOH\) mass required to react with 20 g Tristearin = 0.0673 × 40g = 2.7g

∴ Mass ratio of Tristearin: \(NaOH\) is 20 : 27.

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The net ionic equation of the reaction is as follows:

4 Al3+(aq) + 12 NO3-(aq) + 3 Ag(s) = 4 Al(s) + 12 Ag+(aq) + 12 NO3-(aq)

Ions which remain in their ground state and do not take part in the reaction are called spectator ions. The net ionic equation cancels out these ions, which are present on both the reactant and product sides of the equation.

Spectator ions, which can be found on both the reactant and product sides, but are not included in the finished reaction from the net ionic equation. The \(NO^3^-\) ions are spectator ions in this example, thus taking them out of the equation. The net ionic equation makes up the rest of the species.

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Answer:

Explanation:  check my paage

Answer:

1.58 g Pt

Explanation:

one mole of platinum weighs 195.09 grams (195.09 g/mol).

to convert moles of platinum to grams, we simply multiply the given moles of platinum by 195.09 to convert it to grams.

0.00808 x 195.09 = 1.576 g

Answer:

Kinetic Molecular Theory

Explanation:

The kinetic-molecular theory is a theory that explains the states of matter and is based on the idea that matter is composed of tiny particles that are always in motion. The theory helps explain observable properties and behaviors of solids, liquids, and gases. However, the theory is most easily understood as it applies to gases. The theory applies specifically to a model of a gas called an ideal gas.