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Yield of reaction = 80%

Reaction

Cu(NO₃)₂ (aq) + Na₂S (aq) ⇒ 2 NaNO₃ (aq) + CuS (s)

mol Cu(NO₃)₂ :(MW 187,56 g/mol)

[tex]\tt \dfrac{469}{187.56}=2.5[/tex]

mol Na₂S :(MW 78,0452 g/mol)

[tex]\tt \dfrac{156}{78.0452}=2[/tex]

 Limiting reactant⇒Na₂S( 2 < 2.5)

mol of NaNO₃ (MW = 84,9947 g/mol)

[tex]\tt 2\times 2=4[/tex]

mass  NaNO₃ (theoretical)

[tex]\tt 4\times 84.9947=339.979~g[/tex]

[tex]\tt \dfrac{272}{339.979}=0.8\rightarrow=80\%[/tex]

Answer:1. The instantaneous rate is the rate of a reaction at any particular point in time, a period of time that is so short that the concentrations of reactants and products change by a negligible amount. The initial rate is the instantaneous rate of reaction as it starts (as product just begins to form).

Explanation:

average rate

rate of a chemical reaction computed as the ratio of a measured change in amount or concentration of substance to the time interval over which the change occurred

initial rate

instantaneous rate of a chemical reaction at t = 0 s (immediately after the reaction has begun)

instantaneous rate

rate of a chemical reaction at any instant in time, determined by the slope of the line tangential to a graph of concentration as a function of time

rate of reaction

measure of the speed at which a chemical reaction takes place

rate expression

mathematical representation relating reaction rate to changes in amount, concentration, or pressure of reactant or product species per unit time

Solutions

Answers to Chemistry End of Chapter Exercises

1. The instantaneous rate is the rate of a reaction at any particular point in time, a period of time that is so short that the concentrations of reactants and products change by a negligible amount. The initial rate is the instantaneous rate of reaction as it starts (as product just begins to form). Average rate is the average of the instantaneous rates over a time period.

3.

rate

=

+

1

2

Δ

[

CIF

3

]

Δ

t

=

−

Δ

[

Cl

2

]

Δ

t

=

−

1

3

Δ

[

F

2

]

Δ

t

5. (a) average rate, 0 − 10 s = 0.0375 mol L−1 s−1; average rate, 12 − 18 s = 0.0225 mol L−1 s−1; (b) instantaneous rate, 15 s = 0.0500 mol L−1 s−1; (c) average rate for B formation = 0.0188 mol L−1 s−1; instantaneous rate for B formation = 0.0250 mol L−1 s−1

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Next: 12.2 Factors Affecting Reaction Rates

Answer:

a avarge rat is a select period of time win itstantanous is at that time

Explanation:

Answer:

silicon

Explanation:

Silicon. Silicon is often found in electronic devices, as well as the sand.

hope this helps UwU

Answer:

2.08753919851 cups

0.464942810185139 cups

2.08753919851 cups

Explanation:

i looked it up

Answer:

Explanation:

2C₂H₂ + 5O₂ = 4CO₂ +  2H₂O .

CO₂ formed in moles = 33.4 / 44 = .76 moles

4 moles of CO₂ is formed by 2 moles of C₂H₂

.76 moles of CO₂ is formed by .38 moles of C₂H₂

.38 moles of C₂H₂ were present initially

2 moles of C₂H₂  produces 2 moles of water

.38 moles of C₂H₂  produces .38  moles of water

water produced = .38 moles

= .38 x 18 = 6.84 grams of water .

Answer:

Atom isotopes

Explanation:

The number of protons is equal to the number of electrons in elements therefore atom 2 has 6 protons like atom 1. This means that both are the same atom but with different masses which means they are isotopes.

The atoms are isotopes.

Isotopes are atoms having the same atomic number (i.e proton) but different mass number due to the difference in the neutron number of the atoms involved.

Mass number = 12

Proton = 6

Mass number = 14

Proton = Electron = 6 (for neutrao atom)

From the above, we can see that atom 1 and atom 2 have the same number of protons but different mass number.

Therefore, we can conclude that the atoms are isotopes

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Answer:

two moles noen

Answer:

An object has potential energy (stored energy) when it is not in motion. Once a force has been applied or it begins to move the potential energy changes to kinetic energy (energy of motion).

Therefore, true. (Also would u mind giving brainliest, you don't have to hehe)

Answer:

A Leaf

Explanation:

Compressions are the way that leaves are fossilized as the leaves are pressed firmly between hard layers of rock.

Answer:

Leaf

Explanation:

Because it is a plant

Answer:

5.88%

Explanation:

percent composition depends on relative atomic mass.

the percentage of component present in a compound is

(relative formula mass of component

÷

relative formula mass of compound)

⋅

100

%

the relative atomic mass of

H

(hydrogen) is

1

the relative formula mass of

H2 is 2

the relative atomic mass of S (sulphur) is 32.

2+32=34 the compound H2S is known as hydrogen sulphide.

relative formula mass of

H2÷relative formula mass of (H2S)⋅100%=2/34⋅100%=5.88% (2d.p.)

Answer:

According to your answers last quarter for number 1

Number 2  waxing gibbous

Explanation:

Answer:

Direct evidence from rock samples and indirect evidence from seismic waves may account for why scientists have two ways of thinking about earth's layers

Explanation:

Scientists who study about the earth's structure and components called geologists have two main types of evidence to learn about Earth's interior namely

1. direct evidence from rock samples

2. indirect evidence from seismic waves

Direct evidence From Rock Samples

Scientists examine rocks from inside the Earth and these rocks give them clues about Earth’s structure. Some scientists have drilled holes as much as 12 kilometers into Earth and bring up samples of rock. From these samples, they can make inferences about conditions deep inside Earth, where these rocks formed. In addition, forces inside Earth sometimes blast rock to the surface from depths of more than 100 kilometers. These rocks from deep within the Earth provide more information about the interior.

Indirect evidence From Seismic Waves

Since scientist cannot look inside Earth, they have devised an indirect methods of observation by using seismic waves. When earthquakes occur, they produce seismic waves. Scientists record the seismic waves and study how they travel through Earth. The speed of seismic waves and the paths they take reveal the structure of the planet. Using data from seismic waves, scientists have learned that Earth’s interior is made up of several layers with each layer surrounding the layers beneath it.

Answer:

Atomic radius is directly proportional to Metallic reactivity in group 2.

Explanation:

Atomic radius is directly proportional to Metallic reactivity in group 2.

As we move down the group in group 2 which is called as the alkaline earth metals, the atomic number increases due to which the subshell increases. And the outermost shell's electron are less tightly held to the nucleus of the atom. Since the electrons are loosely held that means they can easily participate in reactions and that what makes it reactive down the 2nd group. Therefore alkaline earth metals with higher atomic number are more chemically reactive.

Answer:

A Brønsted-Lowry acid is any species that can donate a proton (H+) to another molecule. A Brønsted-Lowry base is any species that can accept a proton from another molecule. In short, a Brønsted-Lowry acid is a proton donor (PD), while a Brønsted-Lowry base is a proton acceptor (PA).

Explanation:

Answer:

Autumn is one of the four basic seasons of the year in the temperate climate zone. It is characterized by moderate air temperatures with a decreasing daily average, and relatively high annual precipitation. The climate autumn is the period of the year in which the average daily air temperature ranges around 10° C.

Astronomical fall begins at the fall equinox and lasts until the winter solstice, which roughly means in the southern hemisphere between March 23 and June 22 (sometimes these dates are a day earlier or a day later, and in a leap year they may be additionally retracted one day). During astronomical autumn, the day time of the day is shorter than the night time, and moreover, with each successive day of the day it decreases and night increases.

Answer: the elementary school

Explanation:

Answer:

Unicellular organisms achieve locomotion using cilia and flagella. By creating currents in the surrounding environment, cilia and flagella can move the cell in one direction or another.

Explanation:

Unicellular organisms are the smallest and simplest of all living beings, they are composed of a single cell, and they do not form any type of tissue.

They move through appendages of the membrane that allow movement which are:

Amoebas, unicellular protists, are characterized by their irregular shape and their movements based on pseudopods, that is, tentacular extensions of their cytoplasm that allow them to engulf (engulf) food and incorporate them through their cell membrane.

Therefore, we can conclude that the 3 ways unicellular organisms can move are through fragelli, cilia, and pseudopods.

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Answer:

1. Vaporization

2. Evaporation

3. Heat of vaporization

4. more

Explanation:

This problem deals with a phase change from liquid to gas. In such a change heat is added to cause the vaporization of the liquid to form gases.

Answer:

Hey again sissy how you doing?

Explanation:

Answer:

iron ii is reddish in color and is known as the mineral hematite. iron iii is black and is the mineral wustite.

Explanation:

Answer:

1. Kelvin

Explanation:

The standard temperature for scientific report is the kelvin.

According to the SI unit definition, temperatures should reported in Kelvin.

Answer:

Explanation:

Exothermic Reactions

Exothermic Reactions

This means that the energy required to break the bonds in the reactants is less than the energy released when new bonds form in the products. Excess energy from the reaction is released as heat and light. Figure: Chemical reaction: A Hermite reaction, which produces molten iron.

Answer:

Hey mate, here is your answer. Hope it helps you.

Explanation:

The balanced equation is 2Na+2H2O———-> 2NaOH +H2.

Answer:BC And D

Explanation:just did the quiz

The three phenomena occur during a double-slit experiment and support the wave model of light is bright areas appear on the screen, light bends around the edges of the slit, dark areas appear on the screen. Therefore, option B, C and D are correct.

The double-slit experiment, which was conducted to study the characteristics of light in the eighteenth century, has subsequently been found to illustrate the duality of photons as well as the ideas of superposition and quantum interference.

It implies that things we refer to as "particles," like electrons, in some ways mix the traits of both particles and waves. That is quantum physics' renowned wave-particle duality.

The three phenomena occur during a double-slit experiment and support the wave model of light is bright areas appear on the screen, light bends around the edges of the slit, dark areas appear on the screen.

Thus, option B, C and D are correct.

To learn more about the double slit experiment, follow the link;

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Answer:

[Xe] 4f14 5d9 6s1

Explanation:

Salt and water level is balanced in our body by the proper regulation through hormonal actions. The level of sodium is controlled and the water if needed is reabsorbed from urine. And if the salt concentration is higher it  is removed through urine.

In addition to actively holding or releasing water in urine, the body manages its salt and water balance by excreting extra sodium in urine. This method has the benefit of reducing the need on external water sources for the long-term preservation of bodily fluids.

Researchers discovered that the kidney regulates levels of sodium, potassium, and the waste product urea to save or release water. This may be the link between salt consumption and glucocorticoid levels.

A high-salt meal raised glucocorticoid levels, which increased the amount of energy utilized by the liver and muscle to generate urea, which the kidney then used to conserve water.

The maintenance of the body fluids' normal concentration, or the sum of all dissolved chemicals  that would exert osmotic pressure against a barrier impervious to them, is known as osmotic control.

Find more on osmotic regulation:

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Answer:

C

Explanation:

The airplanes speed would decrease