Chemistry High School
Answers
Answer 1
The mass of the reactants and the mass of the products are no equal.
Answer 2
Answer:
B.
The mass of the reactants and the mass of the products are not equal.
Explanation:
The amount of reactants and products do not have to be equal.
Related Questions
This planet is know as the "Red" planet. It has polar ice caps and is believed to have once had liquid water on its surface. This planet has the thickest atmosphere of the inner planets. It has a dull yellowish tent.
This planet is the smallest of the planets. It has nearly no atmosphere and is the 2nd hottest of the planets. It also has a strong magnetic field of unknown origin.
Answers
Mars is the also known as the red planet, its not the hottest planet because it has a very thick atmosphere.
Mars
Venus I believe is the last ones answer ....
Consider the combustion of octane (C8H18) 2C8H18+25O2-> 16CO2+18H2O
How many grams of CO2 are produced when 191.6g of octane are burned?
Answers
The balanced equation for the above reaction is as follows;
2C₈H₁₈ + 25O₂ ---> 16CO₂ + 18H₂O
stoichiometry of octane to CO₂ is 2:16
number of C₈H₁₈ moles reacted - 191.6 g / 114 g/mol = 1.68 mol
when 2 mol of octane reacts it forms 16 mol of CO₂
therefore when 1.68 mol of octane reacts - it forms 16/2 x 1.68 = 13.45 mol of CO₂
number of CO₂ moles formed - 13.45 mol
therefore mass of CO₂ formed - 13.45 mol x 44 g/mol = 591.8 g
mass of CO₂ formed is 591.8 g
How structural formulas differ from ball-and stick models
Answers
Thedifferencebetween them is that instead ofsticksrepresenting bonds, as in theball and stick model, the spheres that represent atoms are fused together and the size of the sphere represents the size of the actual atom.
predict what will happen to the ammonia equilibrium system if hydrogen gas (H2) is added in the following reaction. N2(g) + 3H2(g) ⇄ 2NH3(g) (2 points)
Answers
According to theLe Chatelier's Principle, if a condition of system is changed, then the system try to become equilibrium again by correcting that change.
N2(g) + 3H2(g) ⇄ 2NH3(g)
If H2(g) is added, then the concentration of H2(g) is high in the system. So the system tries to reduce it and become toequilibrium state. Hence to reduce that H2(g) the forward reaction is promoted. Then Concentration of product,NH3 gas is increased.
Plasma occurs in electrical sparks. These sparks contain A)free protons. B)free molecules. C)ions and electrons. D)neutrons and protons.
Answers
Answer: option C) ions and electrons.
Explanation:
The answer involves just the definition of plasma.
Plasma is a state of the matter (the others are solid, liquid, and gas).
Plasma consists in a mixture of ions and electrons. The ions and electrons in plasma are intimately mixed and contains equal amounts of positive and negative charges.
Plasma is similar to gas, but, due to the presence of charged particles, in plasma the electromagnetic forces are very important.
I looked it up and i saw tht it was ions and electrons.
hope this helps you!! :)
What is used to measure heat? A.change in temperature
B.constant temperature
C.constant specific heat
D.change in specific heat
Answers
Change in temperature is used to measure heat. Therefore, the correct option is option A among all the given options.
What is heat?
Heat is the energy that moves from one body to the next when temperatures are different. Heat passes from the hotter to the colder body when two bodies with differing temperatures are brought together.
Usually, but just not always, this energy transfer results in a rise inside the temperatures of the region of lower temperature as well as a fall in the temperatures of the warmer object. The quantity of heat introduced into or withdrawn from a body as well as the severity of the consequences on the condition of the body are directly correlated. Change in temperature is used to measure heat.
Therefore, the correct option is option A.
To learn more about heat, here:
brainly.com/question/13411214
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The Answer is A and I checked and it was 100%.
Explain how the formation of an undertow differs from the formation of a longshore current.
Answers
In physical oceanography, undertow is the average under-current which is moving offshore when waves are approaching a shore. Undertow is a necessary and universal feature: it is a return flow compensating for the onshore-directed average transport of water by the waves in the zone above the wave troughs. The undertow's flow velocities are generally strongest in the surf zone, where the water is shallow and the waves are high due to shoaling. In popular usage, the word "undertow" is often misapplied to rip currents. An undertow occurs everywhere underneath shore-approaching waves, whereas rip currents are localized narrow offshore currents occurring at certain locations along the coast. Unlike undertow, rip currents are strong at the surface.
Describe some ways you could keep ice from melting over a long period of time?
Answers
Use a light colored container
Line the cooler or bucket with aluminum foil
Wrap the ice bucket in a towel
How many moles of hcl are required to neutralize aqueous solutions of these bases: a.) 0.03 mol koh
b.) 2 mol nh3
c.) 0.1 mol ca(oh)2?
Answers
The answers are a.) 0.03 mol KOH requires 0.03 mol HCl, b.) 2 mol NH3 requires 2 mol HCl and c.) 0.1 mol Ca(OH)2 requires 0.2 mol HCl.
Solution:
We need to write the balanced equations for each reactions to find out the stoichiometry for each reactants.
a.) HCl (aq) + KOH (aq) → KCl (aq) + H2O(ℓ)
From the balanced equations, we can see that 1 HCl reacts with 1 KOH, therefore if 0.03 mol KOH is reacted then 0.03 mol HCl must also be present.
b.) HCl(aq) + NH3(aq) ) → NH4Cl(aq)
If 2 moles of NH3 are reacted then 2 moles of HCl must also be present since 1 HCl reacts with 1 NH3 from the balanced reaction.
c.) 2HCl(aq) + Ca(OH)2(s) → CaCl2(aq) + 2H2O(ℓ)
We can see that 2 HCl react with 1 Ca(OH)2, hence if 0.1 mol of Ca(OH)2 is reacted then 0.2 mol HCl must also be present.
A) Chemical reaction: KOH + HCl→ KCl + H₂O.
n(HCl) : n(KOH) = 1 : 1.
n(HCl) = 0.03 mol.
b) Chemical reaction: HCl + NH₃ → NH₄Cl.
n(HCl) : n(NH₃) = 1 : 1.
n(HCl) = 2 mol.
c) Chemical reaction: Ca(OH)₂ + 2HCl→ CaCl₂ + 2H₂O.
n(HCl) : n(Ca(OH)₂) = 2 : 1.
n(HCl) = 0.2 mol.
Of all the noble gases, ________ has the strongest intermolecular force and hence the highest boiling point. select one: a. ar
b. car
vs. born
d. he
e. DKK
Answers
Xe; the boiling point increases as you go down the column, rn has the highest, then xe
For which nuclear power problem do we not yet have a workable solution? a. finding a substitute for uranium once it is used up
b. safe disposal of hlrw
c. producing steam to turn the turbine that is not radioactive
d. controlling the fission reaction
Answers
The correct answer is B.
Safe disposal of HLRW is the nuclear power problem which we do not yet have a workable solution or may be called high-level radioactivewaste which is the very difficult problem. Nuclear power was a major world energy source which was very strong in the year 1950s but from that time it has faded.
Four moles of hydrogen iodide (hi) gas react with one mole of oxygen (o2) gas to produce two moles of iodine gas (i2) and two moles of water gas (h2o). using this description of the reaction, write the corresponding chemical equation, showing the appropriate coefficients for each reactant and product. (include states-of-matter under the given conditions in your answer.)
Answers
4HI (g) + O2 (g) ---> 4I (g) + 2H2O (g)
The moles are just a measure of the amount of substance, in order to have a balanced equation the above is correct
Which term is dependent on temperature? A. [A]
B. [B]
C. R
D. x + y
E. None of the Above
Which term is dependent on pressure?
A. [A]
B. k
C. R
D. x + y
E. None of the Above
Answers
1. E. None of the Above
2. D. x + y
In reference to item 13, suppose synthesis of al2o3 is done in the lab using 20.50 g of al and excess of o2. upon purification, 30.33 grams of al2o3 is produced. what is the percent yield of al2o3?
Answers
The answer is 78.31%
Solution:
Aluminum reacts with oxygen to form aluminum oxide as shown in the chemical equation
4Al + 3O2 → 2Al2O3
We can see that 4 moles of aluminum is required to produce 2 moles aluminum oxide. Therefore we can calculate for the mass of aluminum oxide using the molar masses of aluminum and aluminum oxide:
mass of Al2O3 = 20.50 g Al (1 mol Al / 26.982 g Al) (2 mol Al2O3 / 4 mol Al) (101.96 g Al2O3 / 1 mol Al2O3)
= 38.733 g Al2O3
If only 30.33 grams of aluminum oxide formed under the conditions the percentage yield is
percent yield = (actual mass/theoretical mass) x 100
= (30.33 / 38.733) x 100
= 78.31%
The balanced equation for the above reaction is as follows;
4Al + 3O₂ --> 2Al₂O₃
stoichiometry of Al to Al₂O₃ is 4:2
the number of Al moles reacted - 20.50 g/ 27 g/mol = 0.76 mol
we have been told that O₂ was provided in excess, therefore Al is the limiting reactant.
Amount of product formed depends on amount of limiting reactant present.
number of Al₂O₃ moles formed are - 0.76 / 2 = 0.38 mol
therefore mass of Al₂O₃ formed is - 0.38 mol x 102 g/mol = 38.76 g
theoretical yield is 38.76 g
but actual yield is 30.33 g
the percentage yield = actual yield / theoretical yield x 100 %
percentage yield = 30.33 g/ 38.76 x 100% = 78.3 %
percentage yield = 78.3 %
How many kj or heat are needed to completely vaporize 23.4 g of h2o? the heat of vaporization for water at boiling point is 40.6 kj/mole. 31.2 52.8 23.4 2.26 none of the above?
Answers
Considering the definition of heat of vaporization, the correct answer is second option: 52.8 kJ are needed t ocompletely vaporize 23.4 g of H₂O.
The heat of vaporization for water at boiling point is 40.6 kJ/mole. In other words, the amount of energy required to transform a mole of liquid water into gas at constant temperature is 40.6 kJ.
Molar mass is the amount of mass that a substance contains in one mole. In this case, the molar mass of the water is 18 g/mole. Then the number of moles that 23.4 g of the compound contains can be calculated as:
Then you can apply the following rule of three: if 1 mole of water requires a heat of vaporization of 40.6 kJ, 1.3 moles of water, how much heat of vaporization does it require?
heat= 52.78 kJ ≅ 52.8 kJ
The correct answer is second option: 52.8 kJ are needed to completely vaporize 23.4 g of H₂O.
Learn more:
- brainly.com/question/9976942?referrer=searchResults
- brainly.com/question/9809898?referrer=searchResults
- brainly.com/question/12625048
Find how many moles of water you are dealing with. There are 18 g per mole.
23.4 g / 18 grams per mole = 1.3 moles of water
40.6 kJ are needed for each mole so 40.6 kJ x 1.3 moles = 52.8 kJ
Hope I helped!
Is the haber process for the industrial synthesis of ammonia spontaneous or nonspontaneous under standard conditions at 25 ∘c? n2(g)+3h2(g)→2nh3(g) δh∘=−92.2 kj; δs∘=−199 j/k?
Answers
The industrial synthesis of ammonia is spontaneous.
to to prove this one calculate the gibbs free energy(delta G)
= delta G = Delta H -T delta s
delta H = -92.2 kj in joules -92.2 x1000 =-92200j
delta s = -199j/k
T= 25+273= 298k
delta G is therefore= -92200-298(-199)=-32898j
since delta G is negative the reaction is therefore spontaneous
Identify an ionic bond. identify an ionic bond. neutrons are lost. protons are pooled. electrons are transferred. protons are shared. electrons are gained.
Answers
Answer:
Electrons are transferred.
Explanation:
Ionic Bond is formed between Cation and an Anion. The formation of Cation takes place when an atom ( mainly Metal) looses electron(s). While an Anion ois formed when an atom ( mainly Non-Metal) accepts or gain electron(s).
Example:
Na + Cl → Na⁺ + Cl− → NaCl
In Above reaction the valence electron of Sodium (2s¹→2s⁰ + e⁻) is transferred to the Valence Shell of Chlorine (3p⁵ + e⁻ →3p⁶) resulting in the formation of Na⁺ and Cl⁻.
If a reaction is endothermic and has a positive delta s, what should you do to the temperature in order to make sure the reaction will run spontaneously
Answers
Answer is: temperature must be increased to very high values.
Thechange in Gibbs free energy (ΔG), at constant temperature and pressure, is:ΔG=ΔH−TΔS.
ΔHis the change in enthalpy; in this exampleΔH>0..
ΔS is change in entropy;ΔS>0.
T is temperature of the system.
WhenΔGis negative, a reaction (occurs without the addition of external energy)will be spontaneous(exergonic).
TΔS>ΔH.
If the pressure of 125 cm3 of nitrogen gas at 100 °c decreases from 885 torr to 225torr, what is the final volume? assume temperature remains constant.
Answers
Suppose the Gas is acting ideally, Then, According to Ideal Gas Equation;
P₁ V₁ = P₂ V₂ ----- (1)
Data Given:
P₁ = 885 torr
V₁ = 125 cm³
P₂ = 225 torr
V₂ = ?
Puting values in eq, 1;
V₂ = P₁ V₁ / P₂
V₂ = (885 torr × 125 cm³)÷ 225 torr
V₂ = 491.66 cm³
A sample of oxygen gas was collected via water displacement. since the oxygen was collected via water displacement, the sample is saturated with water vapor. if the total pressure of the mixture at 26.4 °c is 817 torr, what is the partial pressure of oxygen
Answers
Missing question:The vapor pressure of water at 26.4 °C is 25.81 mm Hg.
p(total) = p(H₂O) + p(O₂).
p(total) = 817 torr;total pressure of the mixture.
p(H₂O) = 25.81 torr,partial pressure of water.
p(O₂) = 817 torr - 25.81.
p(O₂) = 791.19 torr;partial pressure of oxygen.