Consider the following intermediate chemical equations.


What is the enthalpy of the overall chemical reaction?
-205.7 kJ
-113.4 kJ
-14.3 kJ
78.0 kJ

Answer:

A compound containing metallic bonds.

Explanation:

Metals are the best conductors of electricity due to their free-moving electrons, with silver and copper being among the most effective. Copper is widely used for electrical wiring, while silver's use is limited by its cost. Gold is also a good conductor, used where high conductivity is necessary.

The substance most likely to be a conductor is typically a metal because metals have free electrons that can easily move and carry electric current. Among the best conductors of electricity are silver, copper, gold, and aluminum, which are also excellent thermal conductors.

Copper is commonly used in electrical wires due to its high electrical conductivity and cost-effectiveness. However, the best electrical conductor is actually silver; its usage is limited by its high cost. Gold is also used for its high conductivity, especially when high conductivity is required, such as in high-quality audio cables or in electronic connectors that are subjected to heavy wear.

In the case of cooking utensils, they are typically made from good conductors like these metals to efficiently transfer heat. These conductors work well because they have a high density of free electrons that are available to carry the electric charge, resulting in low resistivity. Conversely, insulators have a high resistivity and semiconductors have an intermediate resistivity, with their conductivity varying depending on impurities and other factors.

18. Reaction will occur.

19. Reaction Will occur.

20. Reaction will occur.

21. Reaction will occur.

22. Reaction won't occur.

23. Reaction will occur.

24. Reaction will occur.

25. Reaction won't occur.

The reaction rate of the metals with water, steam, acid, or hydroxides or their inert behavior towards them are noted in the metal activity series.

It contains all the metals one after the other which and the upper metal can replace the lower metal from its salt.

Calcium can replace hydrogen from acid, so the reaction will occur in 18. The products formed are calcium phosphate and hydrogen gas.

Chlorine is more reactive than bromine. So it can replace bromine from its salt to from bromine gas and magnesium chloride.

Aluminium can replace iron from its salt. So it will form aluminium oxide and iron metal. This reaction is used to obtain iron from ores.

Zinc can replace hydrogen from acid. So the products will be zinc chloride and hydrogen gas.

Chromium cannot displace hydrogen form water. So the reaction won't occur.

Tin can replace hydrogen form acid. So the reaction will proceed.

Magnesium will replace platinum from its salt. So magnesium oxide and platinum will form.

Bismuth cannot replace hydrogen from acid. So the reaction won't proceed.

Answer:

Condensation

Explanation:

Answer:

sublimation

Explanation:

it went from boiling so it can't be B. and its not condensation and i dont believe its freezing so C. is your answer

The concentration of hydroxide ion is  5  [tex]\times[/tex] 10^ − 14  M.

Explanation:

Consider the equilibrium of this acid's dissociation,

                          H C l O 4  ⇌  H +  +  C l O  4 -

Moreover, let's assume that  H C l O 4  is a strong acid and will fully dissociate.

Hence,

                              [ H + ]  =  0.20  M

Now, recall,  

                  K w  =  [ H + ] [ O H − ]  =  1.0  [tex]\times[/tex] 10 ^− 14

Hence,

                  ⇒ [ O H − ]  =  K w  / [ H + ]  = 5  [tex]\times[/tex] 10^ − 14  M.

Explanation:

(1)

True

The winds are significant in the distribution of heat across the globe. There are global air circulations around the world such as the Hadley and polar cells that take heat from the hotter regions to the cooler regions. This is driven by high and low-pressure systems on earth that are influenced by the sun. Cooler air masses move from the high-pressure system and displace the warm winds in the low-pressure systems. This helps in maintaining a heat balance on earth.  

(2)

False

The geosphere not only includes all the rocks on the surface of the earth but also the whole of the lithosphere ( or crust), which also includes all the landforms on earth. All the rocks and minerals in the interior of the earth are also part of the geosphere, including the process – such as the convection currents of the mantle- that helps in the shaping of the earth's surface.

(3)

A.

In a storm, the heat from the hydrosphere which is transferred to the atmosphere via the heat of evaporation is what feeds the storm. Therefore these two spheres not only share distribution of heat energy but also water. When the storms dissipate the heat and its water from the clouds, the water flows back to the hydrosphere and the cycle continues.

(4)

True

The biosphere includes all the living and biotic components on earth. Therefore even the marine animals in the oceans are part of the biosphere. They are one aspect that signifies the interaction betwene the hydrosphere and the biosphere. These organisms draw oxygen, water and minerals from the hydrosphere which is important or life.

(5)

True

However, the atmosphere is not the only sphere that distributes heat across the globe. So does the hydrosphere. The ocean's currents are very significant with this regard just as are air currents, The warm surface currents from the equator distribute heat towards the poles while cooler deeper currents  flow towards the equator from the poles – maintaining a heat balance on earth.

(6)

D.

When a volcano erupts, gases  -like sulfur dioxide and carbon dioxide- and pyroclasts from deep in the earth rocks (geosphere) are spewed into the atmosphere. This is an example of how these two spheres of the earth interact.

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Explanation:

We have different gas laws that shows the relationship between pressure , volume , moles and temperature of a gas .

The gas laws that we generally study are :

Let us study about Boyle's Law :

According to it at constant temperature , the volume of a gas varies inversely with the pressure applied on a  gas .

That is : P∞1/v

Or, PV=K (constant )

If we a gas whose volume is changed from V₁ to V₂ and Pressure is changed from P₁ to P₂then we have :

P₁V₁=P₂V₂

[tex]K = PV[/tex] is the mathematical relation between the pressure and volume of the gas when K is given.

At constant temperature, the volume (V)of an ideal gas is inversely proportional to the pressure(P) of the gas.

[tex]P = \dfrac 1V\\\\K = PV[/tex]

Where,

[tex]P[/tex]- the pressure of the gas

[tex]K[/tex] - gas constant

[tex]V[/tex] - the volume of gas

Therefore, [tex]K = PV[/tex] is the mathematical relation between the pressure and volume of the gas when K is given.

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Answer:

Explanation:

                     As we know that half life of any substance is constant. The ratio of parent to daughter atoms after one half life will be 1:1, then after the second half life further half of the first half will decay and will produce more daughter and reduce more parent and making the ratio 1:3, the ratio after 3rd half life will be 1:7, then 1:15 and so on.

Let's suppose that we are given with 100 g of radioactive substance and we are calculating the mass of parent and daughter atoms after every half life as;

1/2 life             Mass of Parent             Mass of Daughter               Ratio

0                            100 g                                   0                            100:0

1                                50                                     50                            1:1

2                               25                                     75                             1:3

3                               12.5                                   87.5                           1:7

4                               6.25                                 93.75                         1:15

Answer:

When a turtle is lying on a sunny riverbank, it’s body temperature rises and when it starts swimming in a cool river, it's body temperatures drop.

Explanation:

Cold-blooded animals, like turtles, do not have an internal feedback loop that regulates constant body temperature – as warm-blooded animals do. Their body temperatures fluctuate with that of the environment. This is why you see animals like lizards basking on rocks to raise their body temperatures. When it too hot, then they seek the shade under these rocks to lower their temperatures.

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Answer:

Explanation: is A

A major difference between a chemical reaction and a nuclear reaction is that a nuclear reaction changes an atom's nucleus and chemical reaction loses/gains electrons.

There are two types of nuclear reactions which are nuclear fusion and nuclear fission .They involve the combination and disintegration of the element's nucleus respectively.

In nuclear fission, the nucleus of the atom is bombarded with electrons of low energy which splits the nucleus in to two parts .Large amount of energy is released in the process.It is used in nuclear power reactors as it produces large amount of energy.

In nuclear fusion,on the other hand, is a reaction which occurs when two or more atoms combine to form a heavy nucleus.Large amount of energy is released in the process which is greater than that of the energy which is released in nuclear fission process.

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Answer:

                       Moles  =  10.625 mol

Explanation:

             Molarity is the amount of solute dissolved per unit volume of solution. It is expressed as,

                         Molarity  =  Moles / Volume of Solution    ----- (1)

We can also rearrange this equation in terms of moles as,

                         Moles  =  Molarity × Volume of Solution  ------(2)

Data Given;

                  Molarity  =  4.25 mol.L⁻¹

                  Volume  =  2.50 L

Now, putting value of Molarity and Volume in eq. 2,

                        Moles  =  4.25 mol.L⁻¹ × 2.50 L

                        Moles  =  10.625 mol

[tex]98 \times mass \text { joule }[/tex] is the potential energy of the ball as it is half way through the fall, 20 meters high

Explanation:

Given data:

Height of the fall = 20 m

Given that the body is half-way through the fall, it is at above the ground 10 m

          [tex]\frac{1}{2} \times 20=10 \mathrm{m}[/tex]

We need to find its potential energy (P.E)

Energy due to the body’s position is referred as potential energy. It means the energy when body is at rest. It can be expressed as below,

         [tex]\text { Potential energy }=m \times g \times h[/tex]

Where

m – The body’s mass

g - Acceleration due to gravity  [tex]\left(9.8 m / s^{2}\right)[/tex]

h - Height of the body

By substituting the given values, we get

           [tex]Potential energy =m \times 9.8 \times 10=98 \times m\ joule[/tex]

Since the mass is not provided, just kept it.

Answer: 98 x m

Explanation:

Answer:

212 degrees Fahrenheit

Answer: 212 degrees Fahrenheit

Answer:

False

Explanation:

The biosphere includes all living organisms on Earth, which certainly includes fish in the ocean. However, the ocean is part of the hydrosphere, which is one of the Earth's spheres that encompasses all of its water, including oceans, lakes, rivers, and other bodies of water. So, the biosphere and hydrosphere are interconnected, but they are not the same thing.

Answer:

The measure of angle ABE is 27°.

Explanation:

Consider the below figure attached with this question.

Given information: ∠ABE=2n+7 and ∠EBF=4n-13.

From the below figure it is clear that ∠ABE and ∠EBF are congruent.

[tex]m\angle ABE=m\angle EBF[/tex]

[tex]2n+7=4n-13[/tex]

Isolate variable terms on one side.

[tex]7+13=4n-2n[/tex]

[tex]20=2n[/tex]

Divide both sides by 2.

[tex]10=n[/tex]

The value of n is 10.

We need to find the measure of ∠ABE.

[tex]\angle ABE=2(10)+7=20+7=27[/tex]

Therefore, the measure of angle ABE is 27°.

The measure of angle ABE is 27°.

Since the angles are congruent, therefore, ∠ABE=2n+7 and ∠EBF = 4n-13 will be equated to each other.

This will be;

2n+7 = 4n-13

Collect like terms

4n-2n = 7+13

2n  = 20  

Divide both sides by 2.  

2n/2 = 20/2

n = 10  

Therefore, the value of n is 10.

Since angle ABE = 2n + 7

ABE = 2[10]  + 7

= 20 + 7 =  27°.  

Therefore, the measure of angle ABE is 27°

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Answer:

Yeah

Explanation:

Mhm

Answer:

2 C2H6O2 + 5 O2 => 4 CO2 + 6H2O

Explanation: The chemical equation is now balanced.

Decrease in temperature is -126.0°C

Explanation:

Using Charles law we can set up the equation as,

V₁/T₁ = V₂/T₂

(2.00 L) / 294.0 K) = (1.00 L) / (x)

cross multiply to get:

2x = 294

2x/2 = 294/2

x = 147.0 K

Now kelvin is converted into Celsius by subtracting 273 from 147 as,

147 - 273 = -126°C

Given that:

Volume,

Temperature,

By using Charles Law, we get

→ [tex]\frac{V_1}{T_1} = \frac{V_2}{T_2}[/tex]

By substituting the values, we get

 [tex]\frac{2.00}{294.0} = \frac{1.00 \ L}{x}[/tex]

    [tex]2x = 294[/tex]

      [tex]x = \frac{294}{2}[/tex]

         [tex]= 147.0 \ K[/tex]

By converting "Kelvin" into "Celsius", we get

= [tex]147-273[/tex]

= [tex]- 126^{\circ} C[/tex]

Thus the response above is correct.

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Answer:

The answer is Weight. The person who said mass is incorrect.

Explanation: Took the test and got it right

Answer:

Weight

Explanation:

It's weight cause it literally only makes sense no other answer would make sense.

Answer:

                      3.011 × 10²³ O₂ Molecules

Explanation:

Data Given:

                Mass of O₂  =  16.0 g

                M.Mass of O₂  =  32.0 g.mol⁻¹

Step 1: Calculate Moles of O₂ as,

                Moles  =  Mass ÷ M.Mass

Putting values,

                Moles  =  16.0g ÷ 32.0 g.mol⁻¹

                Moles  =  0.50 mol of O₂

Step 2: Calculate number of Carbon atoms,

As 1 mole of any substance contains 6.022 × 10²³ particles (Avogadro's Number) then the relation for Moles and Number of Oxygen Molecules can be written as,

      Moles  =  Number of O₂ Molecules ÷ 6.022 × 10²³ Molecules.mol⁻¹

Solving for Number of C atoms,

      Number of O₂ Molecules  =  Moles × 6.022 × 10²³ Molecules.mol⁻¹

Putting value of moles,

      Number of O₂ Molecules  =  0.50 mol × 6.022 × 10²³ Molecules.mol⁻¹

      Number of O₂ Molecules  =  3.011 × 10²³ O₂ Molecules

Answer: 15.7 g CO2

Explanation: Solution attached:

CaCO3 => CaO + CO2

Convert mass of CaCO3 to moles.

Use the mole ratio of CaCO3 and CO2 from the balanced equation.

Convert moles of CO2 to mass using its molar mass.

Answer:

C) They all have the same volume at the same temperature and pressure.

Explanation:

the answer on top of mine is wrong

All of these molecules have 0.5 number of moles. According to Avogadro's law, equal number of moles of gases contains equal volume at STP. Hence, option C is correct.

The condition of standard pressure and temperature is called STP. The temperature of 298 K and a pressure of 1 atm is called standard condition.

At STP the volume of one mole of every substance is 22.4 L.

Molecular mass of O₂ = 32 g/mol

molecular mass of N₂ = 28 g/mol

molar mass of CH₄ = 16 g/mol and

molecular mass of H₂ = 2 g/mol.

The given masses of each of these gases are half of their molar mass. Hence, they are all 0.5 moles. According to Avogadro's law, equal number of moles of different gases have the same volume at STP. Hence,  option C is correct.

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Answer:

a. there is no change in color

also when you mix sugar in water it dissolves which is a physical change :)

Answer:

length tunes height over virtual distance

Answer:

san francisco

Explanation:

its correct i promise <3

Answer: 0.1 mole MgO

Explanation: 1 mole of MgO is equal to its molar mass.

4.00 MgO x 1 mole MgO/ 40g MgO

= 0.1 mole MgO

Answer: Human activities have affected more than D). 70 percent of the Earth's surface

Explanation:

Final answer:

Human activities have transformed over 50% of the Earth's surface, including significant land use changes and impacts on the climate due to emissions from burning fossil fuels.

Explanation:

Human activities have affected more than 50 percent of the Earth's surface. Humans have transformed a large portion of the Earth's land through the expansion of cropland and pasturelands, reduction of forest habitats, and acceleration in land conversion for agriculture and habitation. Human influence extends beyond the land to the oceans and atmosphere through practices like burning fossil fuels, which has contributed substantially to climate change.

Answer:

Explanation:Artificial selection is distinct from natural selection in that it describes selection applied by humans in order to produce genetic change. When artificial selection is imposed, the trait or traits being selected are known, whereas with natural selection they have to be inferred. In most circumstances and unless otherwise qualified, directional selection is applied, i.e., only high-scoring individuals are favored for a quantitative trait. Artificial selection is the basic method of genetic improvement programs for crop plants or livestock (see Selective Breeding). It is also used as a tool in the laboratory to investigate the genetic properties of a trait in a species or population, for example, the magnitude of genetic variance or heritability, the possible duration of and limits to selection, and the correlations among traits, including with fitness.

Wheat plants that produce much larger grains are most likely a result of artificial selection. Therefore, option C is correct.

Artificial selection, also known as "selective breeding”, is where humans select for desired traits in agricultural products or animals, rather than leaving the species to germinate and alter gradually without human interference, like in natural selection.

Agriculture has traditionally utilised artificial selection to breed crops and animals with desired features. Today's meats are the result of carefully bred birds, cattle, sheep, and pigs.

By artificial selection, several fruits and vegetables have been enhanced or even invented.

Thus, Wheat plants that produce much larger grains are most likely a result of artificial selection, option C is correct.

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Your question is incomplete, most probably your question was

which trait is most likely a result of artificial selection?

A. Chickens, cattle, lambs, and pigs have been selectively bred to produce the available meats we eat today.

B. Artificial selection has enhanced or even developed several fruits and vegetables.

C. Wheat plants that produce much larger grains

D. all of the above

When hot magma cools, igneous rocks are formed.

b) When graphite is under higher pressure and heat, it becomes diamond.

c) Igneous rocks include pumice and granite and can be formed above Eath's surface.

d) Metamorphic rocks are formed when existing rocks are changed inside Earth.

Magma is the molten rocks that is found inside Earth’s surface. Its the lava that is stored inside the Earth’s surface. This magma formes out of the Earth's surface during a volcanic eruption, or cools inside the Earth's surface itself to form igneous rock.

Graphite and diamond both are the allotropes of carbon. This is the change in allotropes which can occur in extreme cases of temperatures or pressure which can occur inside the Earth’s surface. This can change graphite to diamond.

Igneous rocks which are externally formed are pumice or basalt which forms when lava comes out of Earth's interior and cools to form rock. Whereas the Igneous rocks like granite are formed when the magma cools inside the Earth’s surface due to cooling of lava.

Metamorphic rocks are formed when the Igneous or sedimentary rocks undergoes conditions of severe temperature or pressure from inside the Earth's surface and the structure of the rock fully changes. This is how the metamorphic rocks form.

Answer:

a) When hot Magma cools, igneous rocks are formed.

b) When Graphite is under higher pressure and heat, it becomes diamond.

c) Igneous rocks include pumice and granite and can be formed above Earth's surface.

d) Metamorphic rocks are formed when existing rocks are changed inside Earth.

Explanation:

Answer: 2.1 qt

Explanation: solution:

2L x 1 qt / 0.95 L = 2.1 qt

Yo sup??

The correct answer is option C

the rest are aldehyde, carboxylic acid and ether respectively.

Hope this helps.

Answer:

Explanation:

it needs to included an if,then statement.