A 21.5 g sample of nickel was treated with excess silver nitrate solution to produce silver metal and nickel(II) nitrate. The reaction was stopped before all the nickel reacted, and 36.5 g of solid metal (nickel and silver) is present. Calculate the mass of solid silver metal present in grams.

Taking into account the reaction stoichiometry, 12.857 grams of Li₂O are formed when 6 grams of Li reacts.

In first place, the balanced reaction is:

4 Li + MnO₂  → 2 Li₂O + Mn

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:

The molar mass of the compounds is:

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

The following rule of three can be applied: if by reaction stoichiometry 28 grams of Li form 60 grams of Li₂O, 6 grams of Li form how much mass of Li₂O?

[tex]mass of Li_{2} O=\frac{6 grams of Lix60 grams of Li_{2} O}{28 grams of Li}[/tex]

mass of Li₂O= 12.857 grams

Finally, 12.857 grams of Li₂O are formed when 6 grams of Li reacts.

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Answer:

0.000000025

Explanation:

[H+]=10^-pH

Answer:

2.5 10^-8

Explanation:

The reaction rate of the SN1 reaction change if the electrophile is switched from the tertiary electrophile to a secondary electrophile will decrease.

SN1 exhibits substitution, nucleophilicity, and monomolecular reaction, and is expressed by the expression rate = k [R-LG]. This means that the rate-determining step of the mechanism depends on the degradation of a single molecular species. Multi-step reactions include intermediates and multiple transition states (TS).

The SN1 reaction is a nucleophilic substitution reaction in which the nucleophile replaces the leaving group (similar to SN2). However, the SN1 reaction is a single molecule. The rate of this reaction depends on the concentration of only one reactant.

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I can form two compounds if I combine calcium, hydrogen and oxygen in five minutes.

A compound is formed by the combination of atoms. It is important to note that the same atoms can be combined in different ways to produce new compounds.

I can form two compounds if I combine calcium, hydrogen and oxygen in five minutes.

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Electrons are emitted from the surface of a metal in photoelectric effect.

The photoelectric effect is the emission of electron from the surface of a metal when light is shone on the surface..

For electrons to be emitted, the light must have a certain frequency known as threshhold frequency.

Therefore, electrons are emitted from the surface of a metal in photoelectric effect.

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Answer: The concentration of the diluted solution is 0.17M.

Explanation:

The equation for diluted solutions is shown as: [tex]M_{s} V_{s} =M_{d} V_{d}[/tex].

~M= Molarity (labeled as M)

~V=Volume (in L)

~s= stock solution (what you started with)

~d= diluted solution (what you finish with)

Now that we have that down, let's plug in our data!

[tex]0.718M*17.6mL=M_{d} *73.3mL[/tex]

(I put [tex]V_{d}[/tex] as 73.3 because you are adding 55.7mL to 17.6mL, meaning that you have to add that to get [tex]V_{d}[/tex]. In other words, [tex]17.6mL+55.7mL=73.3mL[/tex])

There is a little problem here though. The volume is not in liters. But no worries, we can just convert it by dividing it by 1000.

[tex]17.6mL/1000=0.0176L[/tex]     [tex]73.3mL/1000=0.0733L[/tex]

Now that we have both volumes in liters, we can plug them in correctly.

[tex]0.178M*0.0176L=M_{d} *0.0733L[/tex]

[tex]M_{d} =\frac{0.718M*0.0176L}{0.0733L}[/tex]     [tex]M_{d} =0.17M[/tex]

With all of this shown, we now know that the concentration of the diluted solution is 0.17M.

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The pKa of the acid is 4.05

Calculation of pKa:

pKa tells about the strength of acidic molecule.

[tex]pK_{a}= -log[K_a][/tex]

Where Ka is the dissociation constant of an acid.

According to Henderson-Hasselbalch equation:

[tex]pH= pK_{a} + log\frac{[salt]}{[acid]} \\[/tex]

pH= 4.41

Concentration of acid= 0.32M

Concentration of salt= 0.14M

Putting the values in the equation,

[tex]4.41= pK_{a} + log\frac{0.32}{0.14}\\\\4.41= pK_{a} + 0.36\\\\pK_{a}= 4.41 - 0.36\\pK_{a}= 4.05[/tex]

The pKa of the acid is 4.05.

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The types of atoms stay the same in chemical reactions but not in nuclear reactions. The correct option is C.

In chemical reactions, atoms remain the same at the end of every reaction. Although the bonds between atoms may change.

In nuclear reactions, atoms fuse with other atoms to form new atoms entirely. This is otherwise known as nuclear fusion.

Another type of nuclear reaction is nuclear fission. A single atom decomposes to form 2 or more different atoms entirely.

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Answer:

C) types of atoms

Explanation:

i just took the test

Answer:

a. name of element is copper it's proton is 29 neutron is 34 and electron is 29

b.name of element is sodium it's proton is 11 neutron is 12 and electron is 11

c.name of element is chlorine it's proton is 17 neutron is 18 and electron is 17

d.name of element is iron it's proton is 26 neutron is 30 and electron is 26

The answers are as follows;

3 - 4.95 atm

4 - 539 L

5 - 4 L

The gas laws are used to establish the relationship between the pressure, volume, number of moles etc of a gas.

3.

V1 = 1.50 L

V2 = 0.50 L

P1 = 1.65 atm

P2 = ?

P1V1 = P2V2

P2 = P1V1 /V2

P2 = (1.50)(1.65) / (0.50)

P2 = 4.95 atm

4.

P1V1 = P2V2

P1 =  760 mm Hg

V1 = 200.0 L

P2 = 282 mm Hg

V2 = ?

V2 = P1V1/P2

V2 = 760 mm Hg * 200.0 L/282 mm Hg

V2 = 539 L

The volume of the gas increases because the pressure decreases.

5.

Using

V1/T1 = V2/T2

V1T2 =V2T1

V2 = V1T2/T1

V2 = 3.00 L * 373 K/ 273 K

V2 = 4 L

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Answer:

2Al+1.5O2→Al2O3

Thus, 2 mol of Al combine with 1.5 mol of oxygen to form 1 mol of Al2O3.

2 mol of Al corresponds to 2×27=54 g.

Thus, the weight of Al used in the reaction is 54 g.

The efficiency of the engine is 91%.

The efficiency of the engine signifies how much heat is used and converted successfully into usable heat. It is fact that no engine can be 100% efficient because heat loss takes place in different ways during the process.

The efficiency of the engine is calculated by the formula:

Efficiency = Output heat/Input heat x 100

The temperature of heat engine is 1800 K. The temperature of the surrounding is 160 K.

Substitute the values in the above formula.

Efficiency = (1800 - 160)/1800 x 100

= 91%

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Answer:

91%

Explanation:

got it right on edge 23

Answer:

I am sorry

Explanation:

[tex]\huge\boxed{\textsf{Li and Ca}}[/tex]

An element is a substance that can't be broken down further. Lithium (Li) and calcium (Ca) are examples of elements.

Carbon monoxide (CO) and potassium bromide (KBr) are examples of compounds, which are made up of more than one element put together.

Because the molecules are more closely spaced, the solid occupies less space than the same substance when it is in a gaseous state.

Answer:

False

Explanation:

Forms of a given element that have a different number of neutrons are called isotopes.

Answer:

C

Explanation:

Answer:

The awnser is C: it tells you how much of a molecule IS up of each element.

Answer:

synthesis/combination

Explanation:

There are 5 main types of reactions.

combination/synthesis, decomposition, single-replacement, double-replacement, and combustion

synthesis/combination -  A+B → AB

Decomposition - AB → A+B

single- replacement - A + BC → AC + B

double replacement - AB + CD → AD + CB

combustion - example - C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g)

If you wanted to balance this

the answer would be [tex]C + 2H_{2}[/tex] → [tex]CH_{4}[/tex]

25.54 g of diethyl ether would you obtain from 41.8 g of ethyl alcohol if the per cent yield of the reaction is 76.6 %.

A mole is defined as 6.02214076 × [tex]10^{23}[/tex]of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

Step 1: Write the balanced equation

2 CH₃CH₂OH ⇒ CH₃CH₂OCH₂CH₃ + H₂O

Step 2: Calculate the moles corresponding to 41.8 g of CH₃CH₂OH

The molar mass of CH₃CH₂OH is 46.07 g/mol.

41.8 g × 1 mol ÷ 46.07 g = 0.90.

Step 3: Calculate the theoretical moles of CH₃CH₂OCH₂CH₃ produced

The molar ratio of CH₃CH₂OH to CH₃CH₂OCH₂CH₃ is 2:1. The moles of CH₃CH₂OCH₂CH₃ theoretically produced are 1/2 × 0.90 mol = 0.45

Step 4: Calculate the real moles of CH₃CH₂OCH₂CH₃ produced

The percent yield of the reaction is 85%.

0.45 mol × 76.6% = 0.3447 mol

Step 5: Calculate the mass corresponding to  0.3447 moles of CH₃CH₂OCH₂CH₃

The molar mass of CH₃CH₂OCH₂CH₃ is 74.12 g/mol.

34.47 mol × 74.12 g/mol = 25.549164 g

Hence, 25.54 g of diethyl ether would you obtain from 41.8 g of ethyl alcohol if the per cent yield of the reaction is 76.6 %.

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The New Volume is 5.4L

Boyle's law, also known as the Boyle-Mariotte law or Mariotte's law (particularly in France), is an experimental gas law that explains how a gas's pressure tends to drop as the capacity of the container increases.

A current formulation of Boyle's law is:

If the temperature and amount of gas remain constant in a closed system, the absolute pressure exerted by a given mass of an ideal gas is inversely proportional to the volume it occupies.

Boyle's law can be expressed mathematically as either PV = k or P 1/V (Pressure is inversely proportional to volume) (Pressure multiplied by volume equals some constant k)

P1V1 = P2V2

P1 = 242

V1 = 27

P2 = 1210

V2 = (242*27)/1210

V2 = 5.4L

Hence the New Volume V2 is 4.5L

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The pressure exerted by the nitrogen is 718 mmHg.

The oxygen, which is collected over water, will be mixed with water vapor.

This means that the total pressure of the mixture will have two components

The vapor pressure of water at that temperature is approximately 17mmHg.

P total = P oxygen + P water

P oxygen = 735 mmHg − 17mmHg

P oxygen = 718 mmHg

Vapor pressure or equilibrium vapor pressure is described as the strain exerted by way of a vapor in thermodynamic equilibrium with its condensed levels at a given temperature in a closed gadget. The equilibrium vapor stress is an indication of a liquid's evaporation price.

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Answer:

Al(OH)₃ + 3 HCl ----> AlCl₃ + 3 H₂O

Explanation:

In a double-displacement reaction, the cation of one compound is swapped with the cation of another. The basic structure of these reactions is:

AB + CD ----> AD + CB

In this reaction, the aluminum (Al) of Al(OH₃) is replaced by the hydrogen (H) of HCl, and vice versa.

The first resulting compound is AlCl₃. The chlorine has a subscript of 3 in order to eliminate the +3 charge from the Al cation (+3 + 3(-1) = 0). The second resulting compound is HOH, most commonly written as H₂O. There needs to be a coefficient of 3 in front of H₂O to balance the equation.

The complete balanced equation is:

Al(OH)₃ + 3 HCl ----> AlCl₃ + 3 H₂O

If metals are deposited in streambeds placer mining would probably be used. spoil bank mining open-pit mining placer mining strip mining underground mining

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From the reactions, 1.04 g of H2 and 7.995 g of aluminum phosphate is produced.

The term stoichiometry has to do with the amount of substances that participates in a reaction.

For reaction 1;

Mg + 2HCl → MgCl₂ + H₂

Number of moles of Mg reacted =  12.5 g/24g/mol = 0.52 moles

If 1 mole of Mg produced 1 mole of H2

0.52 moles produces 0.52 moles of H2

Mass of H2 =  0.52 moles * 2 g/mol = 1.04 g

For reaction 2;

2Li3PO4 + Al2(SO4)3 → 3Li2SO4 + 2AIPO4

Number of moles of lithium phosphate =  7.5 g/116 g/mol = 0.065 moles

2 moles of Li3PO4 produced 2 moles of AIPO4

0.065 moles of  Li3PO4 produced 0.065 moles of AIPO4

Mass of AIPO4  = 0.065 moles  * 123 g/mol = 7.995 g

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163.1 KJ of heat flows into the gas.

As the pressure is constant, then it is a isobaric process.

In this process , Heat flows is [tex]Q=nC_{p}[/tex]ΔT

Work done is represented by W = PΔV= nRΔT

γ for monoatomic gas is [tex]\frac{5}{3}[/tex]

So, their ratio is

[tex]\frac{W}{Q}[/tex] = [tex]\frac{R}{C_{P} }[/tex] =  R/γR/γ-1 = [tex]\frac{2}{5}[/tex] ….. (1)

Hence, Ratio of W and Q is 2/5

Now given,

Pressure = 233 kPa = 233000 Pa

ΔV= 0.76-0.48 = 0.28[tex]m^{3}[/tex]

So, W = PΔV = 233000 × 0.28 = 65240J

From equation (1)

[tex]\frac{65240}{Q} =\frac{2}{5}[/tex]

Q = 163100J or 163.1 KJ

As the value of Q is positive so, 163.1 KJ of heat flows into the gas.

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​

Answer:

0.86 moles H₂O

Explanation:

To solve this problem, it is important to first determine the balanced chemical equation. The balanced equation is necessary as it will provide the mole-to-mole ratio needed to convert between moles O₂ and moles H₂O.

The unbalanced equation:

C₈H₁₈ (l) + O₂ (g) ---> CO₂ (g) + H₂O (g)

Reactants: 8 carbon, 18 hydrogen, 2 oxygen

Products: 1 carbon, 2 hydrogen, 3 oxygen

As you can see, the equation is not balanced because there are unequal amounts of each element on both sides. Balancing the equation is a matter of guessing-and-checking to see which combination of coefficients work.

The balanced equation:

2 C₈H₁₈ (l) + 25 O₂ (g) ---> 16 CO₂ (g) + 18 H₂O (g)

Reactants: 16 carbon, 36 hydrogen, 50 oxygen

Products: 16 carbon, 36 hydrogen, 50 oxygen

Now that the equation is balanced, we can use the coefficients of O₂ and H₂O to construct our mole-to-mole ratio and perform our conversion. The final answer should have 2 sig figs to match the given value (1.2 moles). The state of matter is most likely not necessary to include in your final answer.

1.2 moles O₂          18 moles H₂O
---------------------  x  -----------------------  =  0.86 moles H₂O
                                25 moles O₂

The approximate change in gravitational force from Earth as a result of the change in radius of the satellite's orbit is -95.07N

The universal law of gravitation states that the particle of matter in the universe attracts another particle with a force directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

It is written thus;

F = G [tex]M_1M_2[/tex]÷ [tex]r^2[/tex]

Where

F = Gravitational force

G = Gravitational constant

[tex]M_1[/tex] and [tex]M_2[/tex] are the masses of the object

r = radius

How to calculate the gravitational force

Formula:

F = G [tex]M_1M_2[/tex]÷ [tex]r^2[/tex]

Given [tex]M_1[/tex] = 100kg

[tex]M_2[/tex] = 5.97 x[tex]10^{24}[/tex] kg

r = 7.5 x [tex]10^6[/tex] m

G =  6.67 x [tex]10^{-11}[/tex] N-m²/kg²

For the first orbit, substitute the values

F = 6.67 x [tex]10^{-11}[/tex]× 150 ×  5.97 x [tex]10^{24}[/tex] ÷ (7.5 x[tex]10^6[/tex])[tex]^2[/tex]

F = 5.95 × [tex]10^{16}[/tex] ÷ 56.25 × [tex]10^{12}[/tex]=  105.77 N

For the second orbit of radius 7.7 x 10^6 m

F =  6.67 x [tex]10^{-11}[/tex] × 100 ×  5.97 x [tex]10^{24}[/tex] ÷ (7.7 x [tex]10^6[/tex])2

F = 5.95 × [tex]10^{16}[/tex]÷ 59.25 × [tex]10^{12}[/tex] = 200. 84 N

The approximate change = 105. 77 - 200. 84 = -95.07N

Hence, the approximate change in gravitational force from Earth as a result of the change in radius of the satellite's orbit is -95.07N

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The values of the changes are

ΔH = 46.44kJ

Δu =  43.34Kj

ΔS = 126.6 J/K

= 1 mol + 75.3 (100 + 273) - 25 + 273 + 1 * 40.79

= 5.6475 + 40.79

= 46.44kJ

1 mol + 75.3 x ln 373/298 + 1 mol x 40.79

= 0.1263

ΔS = 126.6 J/K

46.44 - 0.00831 * 373

= 43.34Kj

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Advantages of Digital thermometer:

Digital thermometer readings can be more readily combined with computer software.      

Digital thermometer:  

Compared to current clinical thermometers, it represents a step forward. There are now digital thermometers available that can measure temperature accurately without using mercury due to mercury's high toxicity and difficulties in disposing of it when a thermometer breaks.

Digital thermometers measure body temperature using heat sensors. They can be utilized to measure body temperatures in the mouth, rectum, or armpit.

Advantage: They are affordable, simple to read, lightweight, portable and need minimal upkeep, and provide precise readings.

Disadvantage: Eventually, the battery powering them runs out, and they are readily broken if dropped.

Liquid-based thermometer:  

It is the most basic and widely used type of temperature measurement instrument.  

Advantage: They are relatively less expensive. In contrast to electrical thermometers, they don't require a power source or batteries to charge.

Disadvantage: They are fragile, only suitable for manual reading applications, and cannot be automated or digitized. A glass thermometer's liquid components could be hazardous or harmful to your health since they could leak chemicals. Liquid-in-glass thermometer readings require excellent vision.

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Considering the definition of pH, the pH is 1.36 and since it is lower than 7, the solution is acidic.

pH is the Hydrogen Potential. It is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.

Mathematically, pH is calculated as the negative base 10 logarithm of the activity of hydrogen ions:

pH= - log [H⁺]= - log [H₃O⁺]

The numerical scale that measures the pH of substances includes the numbers from 0 to 14. The pH value 7 corresponds to neutral substances. Acidic substances are those with a pH lower than 7, while basic substances have a pH higher than 7.

In this case, a solution has a [H₃O⁺] concentration of 4.32×10⁻² M. You can replace this value in the definition of pH:

pH= -log (4.32×10⁻² M)

Solving:

pH= 1.36

Finally, the pH is 1.36 and since it is lower than 7, the solution is acidic.

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