5.0 g of copper was heated from 20°C to 80°C. How much energy was used to heat Cu? (Specific heat capacity of Cu is 0.38 J/g °C)

The number of moles of iron produced can be obtained by the use of  stoichiometry.

The term stoichiometry has to do with mass - mole or mass - volume relationships. Stoichiometric relationships could be used to determine the amount of substance.

Now the reaction equation as well as other details are not shown in this question hence a numerical anwer can not be provided. As such, we can know that the balanced reaction equation can always be used to obtain the amount of iron by stoichiometry.

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Explanation:

it can damage satellites cuase there in space and are not protected by earth

Answer:

I believe is the correct answer

Explanation:

a

Answer:

Bitter in taste

Explanation:

Acids according to Robert Boyle taste sour not bitter.

According to Robert Boyle, the option which is not an acid’s property include the following: d) bitter in taste.

In Chemistry, an acidic solution can be defined as a type of aqueous solution that has a high concentration of hydrogen ions (H⁺), which is typically greater than that of pure water.

According to Robert Boyle, the properties of acids include the following:

They turn a blue Litmus paper red.

They are corrosive

They can act as neutralize bases.

They are sour in taste

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Answer:

In conclusion, the net ionic equation for the reaction between calcium carbonate and hydrochloric acid is CaCO3 solid plus two H+ aqueous react to form Ca2+ aqueous plus CO2 gas plus H2O liquid.

When calcium carbonate reacts with hydrochloric acid, calcium ions are transferred to the solution, the the net ionic equation is CaCO₃(s) + 2H⁺ → Ca²⁺ + CO₂ + OH⁻ + H⁺.

Net ionic equation of any reaction is the equation where all entities are written in the form of ions except spectator ions.

Given chemical reaction is:

CaCO₃(s) + 2HCl(aq) → CaCl₂(aq) + CO₂(g) + H₂O(l)

Ionic reaction for the above reaction will be written as:

CaCO₃(s) + 2H⁺ + 2Cl⁻ → Ca²⁺ + 2Cl⁻ + CO₂ + H⁺ + OH⁻

In the baove reaction Cl⁻ is the spectator ion as they are present on both sides of the given chemical reaction. So the net ionic reaction will be written as:

CaCO₃(s) + 2H⁺ → Ca²⁺ + CO₂ + OH⁻ + H⁺

Hence the net ionic reaction is CaCO₃(s) + 2H⁺ → Ca²⁺ + CO₂ + OH⁻ + H⁺.

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Answer:

Electrons

Explanation:

To calculate the molar volume of a gas at STP you can use the ideal gas law equation,

PV=nRT

Regardless of what ideal gas you use, the molar volume at STP will be identical across the board, since you'll be using 1 mole in the ideal gas law equation regardless of what gas you're dealing with.

That is why the volume occupied by 1 mole of any ideal gas will be equal to 22.7 L at STP.

22.4L = 1 mol

38.0L = ?

= 38/22.4

=1.6964285714 Moles

The valur of energy of formation ΔGf of H₂O is -228.6 kJ/mol.

ΔG of any reaction will be calculated as:

ΔG = Sum of ΔG of products - Sum of ΔG of reactants

Given chemical reaction is:

4NH₃(g) + 5O₂(g) → 4NO(g) + 6H₂O(g)

For this reaction, ΔG will be calculated as:

ΔG = [ΔGf 4(NO) + ΔGf 6(H₂O)] - [ΔGf 4(NH₃) + ΔGf 5(O₂)]

Given that:

ΔG = -957.9 kJ

ΔGf of NH₃ = -16.66 kJ/mol

ΔGf of NO = 86.71 kJ/mol

ΔGf of O₂ = 0 (because it is present in elemental form)

ΔGf of H₂O = let x (to find)

On putting all these values on the above equation, we get

-957.9 = [4(86.71) + 6(x)] - [4(-16.66) + 5(0)]

-957.9 = 346.84 + 6x + 66.64

6x = -957.9 - 346.84 - 66.64

6x = -1,371.38

x = -228.56 = -228.6 kJ/mol

Hence, correct option is (1) i.e. -228.6 kJ/mol.

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Answer:

A) -228.6 kJ/mol

Explanation:

EDGE 2022

Answer:

7L

Explanation:

Divide 101 by 10.1(kPa) and you get 10.

10 x .7 = 7

The concept Boyle's law is used here to determine the new volume of gas . Boyle’s law was put forward by the Anglo-Irish chemist Robert Boyle in the year 1662. Here the new volume of the gas is 0.07 L.

A gas law known as Boyle's law asserts that a gas's pressure is inversely proportional to its volume when it is held at a fixed temperature and of a given mass. To put it another way, as long as the temperature and volume of the gas remain constant, the pressure and volume of the gas are inversely proportional to one another.

For a gas, the relationship between volume and pressure (at constant mass and temperature) can be expressed mathematically as follows.

P = k*(1/V) ⇒ PV = k

For two different gases, the equation is:

P₁V₁ = P₂V₂

V₂ = P₁V₁ / P₂

10.1 × 0.7 / 101 = 0.07 L

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Answer:

This question is hard :( I dont know im so sorry

Explanation:

Sodium hydroxide wasn't used in the synthesis of divanillyl oxalate because it's a strong base.

It should be noted that sodium hydroxide simply means a corrosive cystaline solid which readily absorbs moisture until it dissolves.

In this case, sodium hydroxide wasn't used in the synthesis of divanillyl oxalate because it's a strong base and will decrease the yield of the product.

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Divanillyl oxalate is a chemical that is produced by triethylamine. Sodium hydroxide is not used in its synthesis as it is a strong base.

Sodium hydroxide or caustic soda is an ionic compound with ions of sodium and hydroxide. The formula is shown as, [tex]\rm NaOH[/tex]. It is crystalline and absorbs moisture from the surrounding.

It is not used in the synthesis of divanillyl oxalate as it is a strong base with pH 14 that affects the yield of the product in the reaction.

Therefore, sodium hydroxide is not used in the synthesis reaction.

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Answer:

answer is nitrogen dioxide

Answer:

D. a program on a computer

Explanation:

Answer:

I think it's c I hope this helps

The matter is conserved on a molecular scale when ionic compounds dissociate in solution in the form of solvated ions.

Ionic compounds are those compounds which are formed due to high attractive electrostatic force between the cation (positively charged ion) and anion (negatively charged ion) of any substance.

When a solid ionic compound dissolve in any solution then they will shows dissociation reaction as a result of which we get their ions uniformly distributed in the solution. As water molecule is also polar and ionic compounds are also polar that's why they show complete dissolving in water due to dissociation.

Hence in molecular scale we get it in the form of solvated ions.

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The percent yield of CuO is 96%. The percentage yield shows the extent to which reactants are converted to products.

The percent yield is the actual yield divided by the theroretical yield multiplied by 100.

Now we have the equation;

2Cu(OH)2 → 2CuO + 2H2O

Number of moles of Cu(OH)2 = 6.59 g/98 g/mol = 0.067 moles

Since 2 mole of Cu(OH)2 yeilds 2 moles of CuO

0.067 moles alos yields 0.067 moles of CuO

Mass of CuO = 80 g/mol * 0.067 moles of CuO = 5.36 g

Hence, percent yield =  5.17 g/5.36 g * 100 = 96%

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1. The reaction is a neutralization reaction

2. The reactant added to the water causes an acid reaction

3. The reactant added to the water causes a base reaction

4. The molarity of the solution is 0.025 M

This is a reaction involving an acid and a base which result in the formation of salt and water only

HF + NaOH –> H₂O + NaF

The reaction above indicates neutralization since the reaction produces water (H₂O) and salt (NaF) only

An acid is a substance which dissolves in water to produce hydronium ion H₃O⁺

3HI + 2H₂O —> 2H₃O⁺ + 3I¯ + H⁺

The reaction above is an acid reaction since it produces H₃O⁺

A base is a substance which dissolves in water to produce hydroxide ion OH¯

2CH₃COO¯ + H₂O —> CH₃COO¯ + OH¯ + CH₃COOH

The reaction above is a base reaction since OH¯ is produced.

Molarity = mole / Volume

Molarity = 0.05 / 2

Molarity = 0.025 M

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Answer:

before the substance was a gas it was a liquid.

Explanation:

The final pressure or the air pressure on the top of the mountain is 0.818.

Air pressure is the pressure exerted by air in the atmosphere of the earth.

By the Gas law

[tex]\dfrac{P_1V_1}{ T1} =\dfrac{ P_2V_2 }{T_2}[/tex]

Given, the pressure of the valley floor is 1 atm. = P1

The temperature is 25° C = T1

The volume of the bag is 0.985 L. = V1

The temperature at the top of the mountain is ° C = T2

Now, the volume of the bag is 1. 030 L = V2

To find P2

Put the values in the formula

[tex]\dfrac{1 atm \times0.985 L}{ 25} =\dfrac{ P_2 \times 1. 030 L }{22}\\\\0.03832 = 0.0468 \times P_2\\\\P_2= 0.818[/tex]

Thus, the final pressure is 0.818.

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Answer: The net charge on the cloth with be negative.

Explanation:

Because electrons are being transferred from the neutral rod to the neutral rod to the neutral cloth, the cloth will become negative due to the excess electrons. (The rod will also become positively charged, but that’s beyond the scope of the question.)

When a neutral cloth and a neutral rod are rubbed together then the final charge on the cloth is negative.

Whenever electrons are transferred between objects, neutral matter becomes charged. For example, when atoms lose or gain electrons they become charged particles called ions. Three ways electrons can be transferred in a material that are conduction, friction, and polarization.

Rubbing a neutral rod with a neutral cloth also transfer charge from both the material. We know that a metal rod is a conductor of electricity whereas the cloth is an insulator that does not conduct electricity. When both the rod and cloth is rubbed, electrons are transferred due to friction on the material. Electrons are always negatively charged. As the rod and cloth is rubbed, the electrons flow from the rod to the cloth thereby making the rod as positively charged and the cloth as negatively charged.

Thus, when a neutral cloth and a neutral rod are rubbed together then the final charge on the cloth is negative.

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In acidic solition, the coefficient of permanganate ion in the balanced redox equation is 2.

A redox equation showing a reduction and an oxidation reaction occurring simultaneously.

To balance redox equations, the atoms reacting as well as the electrons transferred are balanced.

In the reaction of permanganate ion and bromide ion in acidic solution, the balanced redox equation is given as follows:

Therefore, the coefficient of permanganate ion in the balanced redox equation is 2.

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The coefficient of the permanganate ion of the MNO₄ - Br- → MN₂ + Br₂ is 2.

A redox equation depicting a simultaneous reduction and oxidation reaction.

The atoms reacting as well as the electrons transferred must be balanced to balance redox equations.

The balanced redox equation for the reaction of permanganate ion and bromide ion in acidic solution is:

[tex]\rm 2 MnO_4- + 10Br^- + 16 H^+ \rightarrow2 Mn_2+ 5 Br_2 + 8 H_2O[/tex]

Thus, the coefficient of the permanganate ion of the MNO₄ - Br- → MN₂ + Br₂ is 2.

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Fuel shortages in the 1980s started the interest in fuel efficiency  best describes a society’s desire for fuel-efficient vehicles because of Iran- Iraq war.

The Iran-Iraq War in 1980 is the main cause of shortage of oil production. Iraq's and Iran's oil production dropped significantly which triggering economic recessions worldwide.

So that's why society’s desire for fuel-efficient vehicles in order to reduce consumption as well as reduce pollution.

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The molecular formula for a compound with a percent composition of 38.7% C, 9.76% H, 51.5% O, and a molar mass of 62.0 g/mol is C₂H₆O₂.

A molecular formula is a chemical formula indicating the kinds and number of atoms of each kind in a molecule of a compound.

To determine the molecular formula, we need to follow a series of steps.

C: 38.7/12.01 = 3.22

H: 9.76/1.01 = 9.66

O: 51.5/16.00 = 3.22

C: 3.22/3.22 = 1

H: 9.76/3.22 = 3

O: 3.22/3.22 = 1

The empirical formula is CH₃O and its molar mass is 31.04 g/mol.

First, we will calculate how many times the empirical formula is contained in the molecular formula by dividing their molar masses.

n = (62.0 g/mol) / (31.04 g/mol) = 2

The molecular formula is 2 times the empirical formula, that is, C₂H₆O₂.

The molecular formula for a compound with a percent composition of 38.7% C, 9.76% H, 51.5% O, and a molar mass of 62.0 g/mol is C₂H₆O₂.

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Balanced equation: 2 HI --> I2 + H2

Explanation:

HI-

H = 1 x 2 = 2

I = 1 x 2 = 2

H2-

H = 2

I = 2

powdered because it has more surface area which leads means there are more reactant particles exposed to collide, therefore the successful collision rate increases, resulting in an increased rate of reaction.

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If enough HCl is not added, the percent yield will be lower as all the magnesium metal has not reacted with HCl.

The percent yield of a reaction is the ratio of the actual yield and the expected yield expressed as a percentage.

The reaction between magnesium metal and HCl liberates hydrogen gas and forms magnesium chloride salt.

If enough HCl was not added to react with all the magnesium metal, the actual yield will be lower.

Hence, percent yield will be lower as well.

Therefore, the percent yield will be lower if all the magnesium metal has not reacted with HCl.

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