Answer:
formula of concentration ion.
At 25°C, which 5.0 g Zn sample will react the fastest with dilute HCÚ?
A)
bar
B)
lump
C)
powdered
D)
sheet metal
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.
[tex]\sf \boxed{\sf fiery answererft}[/tex]
Calculate the number of grams nitric acid (HNO3) in 375 L of a 1.00 M solution.
Explain why Na, Mg, and Al are good conductors of electricity?
Given that delta.g for the reaction below is –957.9 kj, what is delta.gf of h2o? 4nh3(g) 5o2(g) right arrow. 4no(g) 6h2o(g) delta.gf,nh3 = -16.66 kj/mol delta.gf,no = 86.71 kj/mol –228.6 kj/mol –206.4 kj/mol 46.7 kj/mol 90.7 kj/mol
The valur of energy of formation ΔGf of H₂O is -228.6 kJ/mol.
How we calculate ΔG ?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
Hikers noticed that a sealed bag of potato chips puffs up when taken to the top of a mountain. Suppose that at the valley floor below, the air pressure is 1. 0 atm, the temperature is 25°C, and the volume of the bag is 0. 985 L. At the top of the mountain, the temperature is 22°C and the bag has puffed up to 1. 030 L. What is the air pressure on top of the mountain? Type in your answer using the correct number of significant figures. Formula: P1V1 T1 = P2V2 T2 atm.
The final pressure or the air pressure on the top of the mountain is 0.818.
What is air pressure?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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Look at the products of the chemical reaction to determine if the reactant added to water caused an acid reaction, a base reaction, or a neutralization reaction.
Acid
Neutralization
Base
1.
2HF + 2CaOH -> 2H2O + 2NaF
2.
3HI + 2H2O -> 2H3O+ + 3I- + H+
3.
2CH3COO- + H2O -> CH3COO- + OH- + CH3COOH
0.05 moles of HCL are added to 2 L of H2O. What is the molarity of the solution?
Impossible to answer the question with the information provided.
1.60
0.025M
10.4
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
What is a neutralization reaction?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
What is an acid?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⁺
What is a base?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.
How to determine the molarity Mole = 0.05 mole Volume = 2 LMolarity =?Molarity = mole / Volume
Molarity = 0.05 / 2
Molarity = 0.025 M
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If you hadn't added quite enough hydrochloric acid to consume all the magnesium metal, what would be the effect of this error on the percent yield in your experiment? Would the actual yield ( and thus the percent yield) be erroneously high, low, or be unaffected by not adding enough HCl? Explain
If enough HCl is not added, the percent yield will be lower as all the magnesium metal has not reacted with HCl.
What is percent yield of a reaction?The percent yield of a reaction is the ratio of the actual yield and the expected yield expressed as a percentage.
Percent yield = actual yield/expected yield × 100%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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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)
114°
Explanation:
ΔE = mcΔT
ΔE = 5(0.38)(80 - 20)
ΔE = 1.9(60)
ΔE = 114°
What is the difference between an endothermic and an exothermic reaction?
How can solar flares affect the oceans?
Explanation:
it can damage satellites cuase there in space and are not protected by earth
Oxidation reactions involve the loss of __________.
Answer:
Electrons
Explanation:
What is the coefficient of the permanganate ion when the following equation is balanced? mno4- br- → mn2 br2 (acidic solution)
In acidic solition, the coefficient of permanganate ion in the balanced redox equation is 2.
How can a redox equation be balanced?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:
2 MnO4- + 10Br- + 16 H+ → 2 Mn2+ 5 Br2 + 8 H2OTherefore, 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.
What is a redox reaction?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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A gas occupies a volume of 0.7 L at 10.1 kPa. What volume will the gas occupy at 101 kPa?
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.
What is Boyle's law?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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Given the gas conversion factor 1 MOL= 22. 4 L , why couldn’t we just convert 38. 0 L to moles to get the answer for the last problem?
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
When calcium carbonate reacts with hydrochloric acid, calcium ions are transferred to the solution. Write only one net ionic equation for this reaction:
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⁺.
What is net ionic equation?
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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A scientist has a container with a substance inside. At first, the molecules in the substance move away from each other. Later, the molecules move around each other. What change did the scientist observe in the substance
Answer:
before the substance was a gas it was a liquid.
Explanation:
Explain in words what is happening in each chemical equation.
nh3 + o2 -> no2- + 3h+ + 2e-
no2- + h2o -> no3- + 2h+ +2e-
Answer:
Ammonia and oxygen without catalyst | NH3 + O2 → N2 + H2O. With supply of heat, ammonia reacts with oxygen and produce nitrogen gas and water as products. Nitrogen of ammonia is oxidized to nitrogen gas from -3 oxidation state to 0 oxidation state.
Explanation:
How long do peeled boiled eggs last in the refrigerator?.
Answer:
approximately 1 week
Explanation:
Hope this helps, feel free to give feedback
1 to 2 weeks but if they smell a litte more stink then usually you better get rid of them or they my make you sick. i got sick for old boiled egg from the school cafeteria a long time ago.
Explanation:
Why wasn’t sodium hydroxide used in the synthesis of divanillyl oxalate, instead of triethylamine?
Sodium hydroxide wasn't used in the synthesis of divanillyl oxalate because it's a strong base.
What is sodium hydroxide?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.
What is sodium hydroxide?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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Determine the maximum amount of Fe that was produced during the experiment. Explain how you determined this amount
The number of moles of iron produced can be obtained by the use of stoichiometry.
What is 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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Which statement best describes a society’s desire for fuel-efficient vehicles? Choose the correct answer.
Auto manufacturers set fuel-efficiency standards.
Interest in fuel efficiency decreases when fuel prices are low.
Fuel shortages in the 1980s started the interest in fuel efficiency.
An increase in fuel efficiency increases carbon dioxide emissions.
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.
Why Fuel shortages in the 1980s started?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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Explain how matter is conserved on a molecular scale when ionic compounds dissociate in solution ?
The matter is conserved on a molecular scale when ionic compounds dissociate in solution in the form of solvated ions.
What are ionic compounds?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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2. Which statement is TRUE about ionic compounds?
A. In an ionic compound, the positive ion is the cation, the negative ion is the anion, and the cation
is always named first.
B. In an ionic compound, the positive ion is the cation, the negative ion is the anion, and the anion
is always named first.
C. In an ionic compound, the positive ion is the anion, the negative ion is the cation, and the anion
is always named first.
D. In an ionic compound, the positive ion is the anion, the negative ion is the cation, and the cation
is always named first.
Answer:
I think it's c I hope this helps
4. when cu(oh), is heated, it decomposes to black cuo and h,o. consider, how
many grams of cuo will be formed from the decomposition of 6.59 g of cu(oh)?
if only 5.17 g of cuo are produced instead, what is the percent yield?
The percent yield of CuO is 96%. The percentage yield shows the extent to which reactants are converted to products.
What is percent yield?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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nitrogen gas reacts with oxygen gas to produce nitrogen dioxide gas
Answer:
answer is nitrogen dioxide
Which of these form electrolytic solutions with water?
Multiple answers.
A) Sodium Chloride (NaCl)
B) Glucose (C6H12O6)
C) Hydrochloric acid (HCl)
D) Carbon Dioxide (CO2)
Answer:
I believe is the correct answer
Explanation:
a
How can I identify which substance is more thermal stable?
3. Explain why an aluminum ion (A13+) is smaller than a sodium ion (Na+).
Answer:
This question is hard :( I dont know im so sorry
Explanation:
Which of the following phrases best defines the word software?
A.
an object that orbits the Earth
B.
a set of radio waves that are used to determine distance
C.
an image that is taken from the air
D.
a program on a compute
Answer:
D. a program on a computer
Explanation:
Balance the chemical equation
Balanced equation: 2 HI --> I2 + H2
Explanation:
HI-
H = 1 x 2 = 2
I = 1 x 2 = 2
H2-
H = 2
I = 2