Which sentence best illustrates the idea outlined above

Answer:

Q = 0.768 calorie

Explanation:

Given that,

Mass of water, m = 18.2g

The temperature changes from 25.2°C to 67.4 °C.

The specific heat of water, c = 4.184 J/g °C

We need to find the heat needed to change in temperature. The formula is given by :

[tex]Q=mc\Delta T\\\\Q=18.2\times 4.184\times (67.4-25.2)\\\\Q=3213.47\ J[/tex]

We know that, 1 calorie = 4184 J

or

1 J = (1/4184) calories

t means,

[tex]3213.47\ J=\dfrac{3213.47}{4184}\ J\\\\=0.768\ calorie[/tex]

So, the required heat needed is 0.768 cal.

So, 0.768 calorie of heat is needed.

Answer:

The new temperature is 19.072 K.

Explanation:

Charles's Law consists of the relationship that exists between the volume and the temperature of a certain quantity of ideal gas, which is maintained at a constant pressure. This law says that as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases because the temperature is directly related to the energy of the movement of the gas molecules.

In summary, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the quotient that exists between the volume and the temperature will always have the same value:

[tex]\frac{V}{T}=k[/tex]

Assuming that a certain volume of gas V1 that is at a temperature T1 at the beginning of the experiment varies up to a volume of gas V2, then the temperature will change to T2, and it will be true:

[tex]\frac{V1}{T1}=\frac{V2}{T2}[/tex]

In this case:

Replacing:

[tex]\frac{500 mL}{298 K}=\frac{32 mL}{T2}[/tex]

Solving:

[tex]T2=32 mL*\frac{298 K}{500 mL}[/tex]

T2= 19.072 K

The new temperature is 19.072 K.

The addition or subtraction of thermal energy. For example if you heat up an ice cube, it will melt to become water. If you heat it even more, it will evaporate.

Answer:

La fuerza de atracción en el hielo sólido, que es un compuesto molecular, se debe al enlace de hidrógeno (que es la fuerza intermolecular más fuerte) entre las moléculas individuales de agua, por lo tanto, el hielo sólido es bastante fuerte y se mantiene en una estructura rígida.

Cuando el hielo se calienta, las moléculas absorben suficiente energía y, en lugar de solo la vibración del hidrógeno dentro de un área muy pequeña, los enlaces de hidrógeno se doblan y se estiran, con los ángulos y la longitud de los enlaces oscilando dentro de los rangos esperados.

Como tal, las fuerzas de atracción en el agua líquida son menores que las del hielo y las fuerzas de repulsión entre cargas similares tienen un efecto mayor en la plasticidad del agua que el hielo.

Explanation:

Answer:

29.92g

Explanation:

tell me if my answer is wrong

Answer:

10.0 g of AgI will produce 5.28 g of Ag₂S

Explanation:

The balanced equation of the reaction is given below:

2AgI + Na₂S ----> Ag₂S + 2NaI

From the equation of reaction, 2 moles of AgI produces 1 mole of Ag₂S

The moles of a substance is related to its mass by a quantity known as molar mass which is defined as the mass of one mole of that substance.

Molar mass of AgI = (108 + 127) g = 235 g

Molar mass of Ag₂S = (108 × 2 + 32) g= 248 g

Mass of 2 moles of AgI = 2 × 235 g = 470 g

470 g of AgI produces 248 g of Ag₂S

10 g of AgI will produce 248 /470 × 10 g of Ag₂S = 5.28 g

Therefore, mass of Ag₂S produced = 5.28 g

Answer:

I do not really no sorry

Explanation:

:))

Answer:

pH → 1.83

Explanation:

Let's write the lactic acid as HLac, because it is a monoprotic weak acid.

HLac + H₂O  ⇄  H₃O⁺  +  Lac⁻      Ka

Initially we have 0.25 moles, so x amount has reacted. At the end, when the equilibrium is finished, we may have (0.25 - x) moles of acid, x moles of protons have been released and x moles of lactate were formed.

In order to find x, we use the acid constant, Ka. The expression for Ka is:

Ka = [H₃O⁺] .  [Lac⁻] / [HLac]

8.3×10⁻⁴  = x² / (0.25-x)

8.3×10⁻⁴ (0.25 - x) = x²

8.3×10⁻⁴ . 0.25 - 8.3×10⁻⁴x - x² → this is a quadractic function

a = -1,  b = 8.3×10⁻⁴, c = 2.07×10⁻⁴

We solve: (-b - √(b² - 4ac) / (2a)

(-8.3×10⁻⁴ - (√ ((8.3×10⁻⁴)² - 4 (-1) (2.07×10⁻⁴) ) / (2 . -1) = 0.0148

[H₃O⁺] = 0.0148 M

- log [H₃O⁺] = pH → - log 0.0148 = 1.83

The pH is defined as the power of Hydrogen. The pH of a 0.25 M solution of lactic acid is 1.83.

[tex]\bold { CH_3COOH \rightarrow CH_3 COO + H^+\ \ \ \ \ \ \ \ \ \ \ \ (Ka = 8.3 x 10 -4 ).}[/tex]

Initial concentration of lactic acid is 0.25 M,  So, [tex]x[/tex]. At the end of equilibrium [tex]x[/tex] amount of lactic acid dissociates.

So, concentration of the Hydrogen ion in the (0.25 - [tex]x[/tex])  

[tex]x[/tex] can be found out by using the dissociation constant formula,

[tex]\bold {Ka = \dfrac {[H^+][CH_3COO^-]}{[Ch_3COOH]}}\\[/tex]

[tex]\bold {8.3x10^-^4= \dfrac {[x][x]}{[2.5- x]}}\\\\\bold {8.3x10^-^4= \dfrac {[x^2]}{[2.5- x]}}\\\\\bold {x^2= 8.3x10^-^4\times [2.5- x]}}\\\\\bold {8.3x10^-^4 \times 0.25 - 8.3x10^-^4 x - x^2 = 0}[/tex]      

The equation above is a quadratic equation, solving it we get,

The concentration of protons = 0.0148 M

Put this into the pH formula,

[tex]\bold {pH = -log [H^+]}[/tex]

[tex]\bold {pH = -log [ 0.0148]}\\\\\bold {pH = 1.83}[/tex]

Therefore, the pH of a 0.25 M solution of lactic acid is 1.83.

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Answer:

At the completion of reaction.

Explanation:

The time when the reaction take places is the most significant time for measuring temperature of the solution because on this time the temperature will decrease or increase. Some reactions releases heat energy upon completion we called them exothermic reactions whereas some absorb heat energy from the surrounding, decreases the temperature which is known as endothermic reaction so measuring temperature at the completion of reaction is the correct time.

Answer:

It's important for scientists to know the properties of matter because all things are made up of matter. Each type of matter has different physical characteristics and scientists need to know and understand these characteristics to make calculations. ... The main phases of matter are solid, liquid, and gas.

Answer: 2Cr + 3Br2 Yields 3CrBr3

Explanation:

We know that 4a is not balanced because there are 3 Nitrogen atoms on the reactants side and 2 on the products side.

We know that 4c is not balanced because there are 4 Chlorine atoms on the reactants side and 2 on the products side. (Remember there are 2 Cl2 atoms. Therefore, 2 times 2 means there are 4 Chlorine atoms on the reactants side)

Finally, we know the answer is not 4d because there is 1 Potassium on the reactants side and 2 potassiums on the products side.

Therefore, the answer must be 4b, which contains 2 Chromium atoms and 6 bromine atoms on each side

Answer:

41.54 grams of oxygen are required to burn 13.5 g of acetylene

Explanation:

The balanced reaction is:

2 C₂H₂ + 5 O₂ → 4 CO₂ + 2 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

Being the molar mass of the compounds:

By reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

You can apply the following rule of three: if by stoichiometry 52 grams of acetylene react with 160 grams of oxygen, 13.5 grams of acetylene react with how much mass of oxygen?

[tex]mass of oxygen=\frac{13.5 grams of acetylene*160 grams of oxygen}{52 grams of acetylene}[/tex]

mass of oxygen= 41.54 grams

41.54 grams of oxygen are required to burn 13.5 g of acetylene

Answer:

https://download.cnet.com/1-Click-Answers/3000-2378_4-10060189.html

Explanation:

Answer:

6.022x10^23 atoms of Ca

Explanation:

Answer:

I think its A-When the car is cruising straight down a highway

Answer:

chemical energy

Explanation:

just put that

Answer:

chemical energy

Explanation:

it is the light dependent reaction

D. A13+(aq) | Al(s) || Ni(s) | Ni2+(aq). The standard cell notation of a galvanic cell made with aluminum and nickel is  A13+(aq) | Al(s) || Ni(s) | Ni2+(aq).

The anode is on the left, and the cathode is on the right. The convention specifies that metals come first and then the metal ions present in the electrolyte represent the cell. And a vertical line is required to separate these two.

Voltaic or galvanic (spontaneous) cells are denoted by cell notations in shorthand. This special shorthand describes the anode, cathode, and electrode components as well as the reaction circumstances (pressure, temperature, concentration, etc.).

A galvanic cell is made up of two distinct metals (electrodes), connected externally to complete a circuit and through a conducting liquid (an electrolyte).

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Answer:

Answer is C

Explanation:

the valency of sulphur is 2 ans sodium is 1

by crossing it forms NA2S

Answer:

Asteroids and comets have a few things in common. They are both celestial bodies orbiting our Sun, and they both can have unusual orbits, sometimes straying close to Earth or the other planets. ... While asteroids consist of metals and rocky material, comets are made up of ice, dust, rocky materials and organic compounds.

Answer:

yes you do so you know how strong it is how maluble it's is so it can be customised to it's specific use

Answer:

alloy's properties are usually different from those of its component elements. Alloy constituents are usually measured by mass. Unlike pure metals, most alloys do not have a single melting point; rather, they have a melting range in which the substance is a mixture of solid and liquid.

Alloy steels have a wide range of special properties, such as hardness, toughness, corrosion resistance, magnetizability, and ductility. Nonferrous alloys, mainly copper–nickel, bronze, and aluminum alloys, are much used in coinage.

Pure metals are useful but their applications are often limited to each individual metal's properties. Alloys allow metal mixtures that have increased resistance to oxidation, increased strength, conductivity, and melting point; Essentially any property can be manipulated by adjusting alloy concentrations.

dnt learn all thr properties.

these are the main properties..u can learn thse only. hope it will help u

Answer:

1.09 mL

Explanation:

Density is a measure of a substance's mass over its volume.

d = m/v

We can rearrange the equation to solve for volume, using algebra.

v = d/m

Therefore v = 6.35/5.80 = 1.09 mL

Answer:

An unbalanced force? .

Pls give me feedback if thats not right.

When a outside force acts upon it.

Answer:

The pH scale 7 indicates neutral.

Explanation:

Answer:

72.95%

Explanation:

Para resolver esta pregunta, debemos hallar las moles tóricas que se producirían en la reacción asumiendo que los 500g son únicamente de clorato de potasio haciendo uso de la reacción balanceada:

2KClO₃(s) → 2KCl(s) + 3O₂(g)

Donde dos moles de clorato de potasio producen tres moles de oxígeno.

Después de hallar las moles teóricas de oxígeno debemos hallar las moles producidas usando PV = nRT. La pureza SERÁ:

Moles producidas / moles Teóricas * 100

Moles clorato -Masa molar: 122.55g/mol-:

500g KClO₃ * (1mol / 122.55g) = 4.08 moles KClO₃

Moles O₂ teóricas:

4.08 moles KClO₃ * (3 moles O₂ / 2 moles KClO₃) = 6.12 moles

Moles producidas:

PV / RT = n

Donde P = 1atm a STP

V es volumen = 100L

R es constante de los gases = 0.082atmL/molK

T =273.15K a STP

Reemplazando:

1atm*100L / 0.082atmL/molK*273.15K = 4.46 moles

La pureza de la muestra es:

4.46 moles / 6.12 moles * 100 = 72.95%

Answer:

Otherwise, positive charge means that the element lost an electron and negative charge means it gained an electron. (3) The atomic mass is equal to the sum of the number of protons and number of neutrons. An atom of the calcium-40 isotope has 20 neutrons in its nucleus.