Answer:
Freezing point depression is a property of solutions where the solute lowers the normal freezing point of the solvent.
Diethyl ether has a δhvap of 29. 1 kj/mol and a vapor pressure of 0. 703 atm at 25. 0°c. What is its vapor pressure at 76. 0°c?
The heat of vaporization is the heat required to turn 1 gm solid into a liquid. The vapor pressure of diethyl ether at 76 degrees celsius is 1.95 atm.
What is vapor pressure?Vapour pressure is the pressure exerted by the vapors of the equilibrium system. Clausius-Clapeyron equation is used to find the vapor pressure.
[tex]\rm ln \dfrac{P_{2}}{P_{1}} = \rm \dfrac{\delta H}{R} (\dfrac{1}{T_{1}} - \dfrac{1}{T_{2}})[/tex]
Given,
Initial pressure = 0. 703 atm
Initial temperature = 298K
Final temperature = 349 K
Change in enthalpy of vaporization = 29100J/mol
Boltzman constant = 8.314 J/K mol
Substituting values above:
[tex]\begin{aligned} \rm ln \dfrac{P_{2}}{P_{1}} & = \rm \dfrac{\delta H}{R} (\dfrac{1}{T_{1}} - \dfrac{1}{T_{2}})\\\\&= \dfrac{9100}{8.314}(0.0004903)\\\\&= 0.5363\end{aligned}[/tex]
Solving further,
[tex]\begin{aligned} \rm ln \dfrac{P_{2}}{0.703} &= 0.5363\\\\& = \rm e^{0.5363}\\\\&= 1.70\end{aligned}[/tex]
The final pressure is calculated as:
[tex]\rm P_{2} = (0.703 atm)(1.70) = 1.95\;\rm atm[/tex]
Therefore, the vapor pressure at 76 degrees celsius is 1.95 atm.
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The most common source of copper (cu) is the mineral chalcopyrite (cufes2). How many kilograms of chalcopyrite must be mined to obtain 500. G of pure cu?
The amount of chalcopyrite must be mined to obtain 500g of pure Cu is 1.4 kilograms.
What is the relation between mass & moles?Relation between the mass and moles of any substance will be represented as:
n = W/M, where
W = given massM = molar massMoles of Cu = 500g / 63.5g/mol = 7.87 mole
Given chemical reaction is:
CuFeS₂ → Cu²⁺ + Fe²⁺ + 2S²⁻
From the stoichiometry of the reaction, it is clear that
1 mole of Cu = produced by 1 mole of CuFeS₂
7.87 mole of Cu = produced by 7.87 mole of CuFeS₂
Mass of given moles of CuFeS₂ = (7.87mol)(183.5g/mol) = 1,444.14g = 1.4kg
Hence required mass of CuFeS₂ is 1.4 kg.
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) If 35.0 mL of 1.50 M solution is diluted to 100. mL, what is the concentration of the dilute solution
Answer:
0.53 (sig figs) or 0.525 original answer
Explanation:
If you use the formula (M1)(V2)=(M2)(V2) and plug in the values, you are solving for the missing X, which is the concentration.
which of the following enthalpy diagrams represent exothermic reactions? Endothermic reactions? please state which one each diagram is.
Answer:
a,c and d are exothermic
b is the endothermic
Explanation:
exothermic because energy required to form products is less than the energy required to break bonds in reactants.
endothermic because energy required to form products is larger than the energy required to break bonds in reactants.
What is AH in the equation AG = AH - TAS
Answer:
option c is the correct answer of given statement in chemistry
Answer: The answer is D. (The other answer is incorrect)
Explanation: AH is just known as enthalpy. Search it up!
__________ happens when no particles or atoms can move anymore due to the lack of heat
Freezing Point
Absolute Zero
The Ice Theory of 83
Radiation
Absolute Zero happens when no particles or atoms can move anymore due to the lack of heat. Option A.
What is Absolute Zero temperature?Generally, Absolute zero is simply the moment at which all of the atoms have totally halted relatively to each other.
In conclusion, Absolute Zero occurs when no particles or atoms can move owing to a lack of heat.
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Classify each chemical compound as ionic or molecular:
1. MnP ionic or molecular?
2. AIOH3 ionic or molecular?
3. C3S2 ionic or molecular?
The following is a classification of the compounds;
MnP - ionicAIOH3 - ionic C3S2 - molecularWhat is an ionic substance?The term ionic substance refers to a substance that is composed of ions. It is a substance that can dissolve in water.
The following is a classification of the compounds;
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Write the chemical equation for this reaction. Use the picture I provide!
Answer:
H2O
H2O
Explanation:
because the are only two hydrogen that can react to Oxygen
determine the molarity of a solution that contains 7.5 mol of HCL in 350 mL of water
Answer:
21.4 M
Explanation:
7.5 mole / ( 350/1000) = 21.4 M
1: Why are scientific observations important?
Every experiment uses qualitative observations.
Every experiment ends with observations.
Every experiment begins with observations.
Every experiment uses quantitative observations.
2:
What is one way in which a field investigation can differ from a classroom or laboratory experiment?
In field investigations, it is much more difficult to separate your control and experimental groups.
In field investigations, you are usually working with much larger animals than in the lab.
In field investigations, you are always working with microscopic organisms.
In field investigations, it is much easier to separate your control and experimental groups.
3: Qualitative observations are ______.
based on your senses
measurable
often taken using instruments
only made by scientists in a laboratory
4: Which observation is quantitative?
The flower has five petals.
The flower has a thin stem.
The flower is purple.
The flower is tall.
5: Which statements are true about observations? (Select all that apply.)
Lab experiments rely on observations, but field investigations do not.
We naturally make observations about the world around us.
They are statements made based on something seen, noticed, or measured.
Observations are only made in a laboratory setting.
According to the research, scientific observations are important because every experiment begins with observations.
What are observations?It consists of receiving knowledge of the outside world through our senses, it means that we naturally make observations about the world around us and the first step proposed by the scientific method.
Scientific observation, on the other hand, refers to the process of detailing any phenomenon of nature with analytical intent, usually later replicated in a laboratory (experimentation) or controlled environment.
Similarly, there are qualitative observations that are based on the senses, which are generally more subjective, while quantitative observations are more objective, focusing mainly on numbers, for example "the flower has five petals" is a quantitative observation.
Therefore, we can conclude that according to the context, scientific observations are important because every experiment begins with observations.
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Answer:
1. Every experiment begins with observations
2.In field investigations, it is much more difficult to separate your control and experimental groups.
3.based on your senses
4.The flower has five petals.
5.We naturally make observations about the world around us.
They are statements made based on something seen, noticed, or measured. (I think 5 is wrong, if it is then sorry guys dont report me, i tried my best.)
Explanation:
Acids generally release h2 gas when they react with
Answer:
Metals
Explanation:
When acids react with metals h2 gas is produced and a salt is formed
eg. Na + HCL ---------- NaCl + H2
Answer:
active metals
Explanation:
Write the chemical equation for the follow- ing: "carbon plus oxygen produces carbon dioxide." Label the parts of the equation.
How to tell which acid whill have the hightest perceent ionization
We can tell which acid which have the highest percent ionization on the basis of pH value.
What is percent ionization?The % ionized indicates how much of the original chemical has ionized. As a result, we compare the ion concentration in solution to the neutral species' original concentration.
If any acid have a high pH value then they must show high percent ionization because they are strong in nature and show full dissociation.
Hence acids with high pH value will show highest percent ionization.
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Identify reduced, oxidized substance, reducing and oxidizing agents in 3 No₂+ H₂0 -> 2HNO3 + No
Answer:
(c) Fe2O3 + 3CO → 2Fe + 3CO2
Explanation:(c) Fe2O3 + 3CO → 2Fe + 3CO2
Carbon monoxide (CO) is the reducing agent, it has reduced ferric oxide (Fe2O3) which acts as an oxidising agent.
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when a solid will not dissolve in a liquid, it is termed___
a. insoluble
b. miscible
c. soluble
d. dissolvable
Answer:
a. insoluble.
Explanation:
This is the opposite of soluble, which means things can dissolve in a liquid, so insoluble means a solid cannot dissolve in a liquid.
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You have a big bon fire outside in your back yard . Although it is only 40 degrees F, you and your friends are all warm sitting by the fire. This is
Question 14 options:
An exothermic exchange from radiant energy.
An endothermic exchange from conduction.
An exothermic exchange by conduction.
None of the above are correct
Answer:
An exothermic exchange by conduction
Explanation:
Because the heating system (the bonfire) is what is conducting the energy, and is transferring said energy to it’s surroundings, this is an exothermic exchange.
Definition: The time in an age-structure diagram where the population is not yet reproducing.
Answer:
Explanation:An age-structure diagram provides a snapshot of the current population and can represent information about the past and give potential clues about future problems. When you are interpreting age-structure diagrams, it is important to compare the width of the base to the rest of the population
What is the empirical formula of a compound containing 90 g carbon 11 g hydrogen and 35 g nitrogen
The empirical formula of the compound containing 90 g carbon, 11 g hydrogen and 35 g nitrogen is C₆H₉N₂
Data obtained from the questionCarbon = 90 gHydrogen = 11 gNitrogen = 35 gEmpirical formula = ?How to determine the empirical formulaDivide by their molar mass
C = 90 / 12 = 7.5
H = 11 / 1 = 11
N = 35 / 14 = 2.5
Divide by the smallest
C = 7.5 / 2.5 = 3
H = 11 / 2.5 = 4.4
N = 2.5 / 2.5 = 1
Multiply by 2
C = 3 × 2 = 6
H = 4.4 × 2 ≈ 9
N = 1 × 2 = 2
Thus, the empirical formula of the compound is C₆H₉N₂
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Where on the periodic table is a metal element most likely found? Do not think about the stair case split.
bottom
right side
middle
Answer:
C.) Middle
Explanation:
A.) is incorrect because elements on the bottom of the periodic table can be metals, nonmetals, or metalloids. However, the majority of these elements would be metals.
B.) is incorrect because elements on the right side (aka. the p-block) of the periodic table are mostly nonmetals. This excluding the stair case elements which are metalloids and elements to the left of the stair case which are metals.
C.) is correct because elements located in the middle of the periodic table (aka. the d-block) are always metals. The elements in this section are usually nicknamed the "transition metals". It should be noted that elements on the left side (aka. the s-block) of the periodic table are also metals (excluding hydrogen).
How to calculate delta g for autoionization of water
The Delta G for the autoionization of water can be calculated as [tex]\Delta G=-RTlnK[/tex].
What is the autoionization of water?The autoionization of water is given as the reaction of the two water molecules, resulting in the formation of the ions of hydronium and hydroxide ion.
It can be expressed as:
[tex]\rm 2\;H_2O\;\leftrightharpoons\;H_3O^+\;+\;OH^-[/tex]
The[tex]\Delta G[/tex] of the autoionization of water can be given as;
[tex]\Delta G=-RTlnK[/tex]
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A 10.00-mL sample of HCI solution was transferred to an Erlenmeyer flask and diluted by adding about 40 mL of distilled water. Phenolphthalein indicator was added, and the solution was titrated with 0.215 M NaOH until the indicator just turned pink. The exact volume of NaOH required was 22.75 mL. Calculate the concentration of HCI in the original 10.00-mL sample.
Use Relationship between C and V
C1V1=C2V2(40-10)C1=22.75(0.215)30C1=4.9C1=4.9/30C1=0.1634MA solution of 5 m hci is already made. you need to dilute the solution to 1 m hci. the 1 m hci solution is _____
options :slower, stronger, weaker, faster ,
1M HCl solution is weaker
what does doping mean ?
give an example.
[tex] \\ [/tex]
ty! ~
D∅ping is usually used in sports to refer to the act of taking substances that enhance performances.
What is d∅ping?D∅ping refers to the act of taking substances that are banned in sports.
The word is usually used with respect to sporting events. Certain substances have been found to give athletes a performance advantage over their competitors. These are referred to as d∅pes and are usually banned in most sports.
When a sportsperson takes any of these banned substances, they are said to have d∅ped.
For example, an athlete anabolic steroids before taking part in a sporting event.
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Doping = use of drugs to improve athletic performance.
Doping means taking of some drugs that enhance athletic performance. Many players use doping to enhance their performance. It is illegal, and it is banned. If any player caught doing this, he/she might be suspended for years.
Hope it help you
Identify the atom below.
a.) H
b.) He
c.) Bе
d.) С
Answer:
B. Helium
Explanation:
Correct me if I'm wrong
A gem has a mass of 5. 50 g. When the gem is placed in a graduated cylinder containing 9. 500 ml of water, the water level rises to 10. 45 ml
The density in grams per milliliter 7.975.
What is density?Density is the mass of per unit volume. Density is equals to mass into volume.
D = M x V
The mass of a gem is given, M = 5.50
The volume is 10.45 - 9.00 = 1.45
Thus, the density is
D = 5.50 × 1.45 = 7.975
Thus, the density in grams per milliliter is 7.975.
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4. An element is a substance made up of two kinds of matter. True or false?
A. true
B. false
Answer:
false
Explanation:
Elements are pure substance. A ball of sodium will only have sodium atoms.
Nitrate reduction test consider the uninoculated tube. A. Is it a positive or negative control?
The nitrate reduction test with the uninoculated tube considers it a positive control.
What is a nitrate reduction assay?The nitrate reduction assay is given as the assay with the ability of the bacteria or enzyme to reduce nitrate to nitrite.
The test is performed by considering the difference in the inoculated and the uninoculated tubes with bacteria. The tube with the bacteria and the nitrate is termed a test tube.
The tube with nitrate only without bacteria is termed as a negative control, as it will not have the results for the reduction and can be used to assess the test.
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a solution with an [OH-] concentration of 1.20 x 10-7M has a pOH and pH of?
Taking into account the definition of pH and pOH, the solution has a pOH of 6.92 and a pH of 7.08.
Definition of pHpH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.
The pH is defined as the negative base 10 logarithm of the activity of hydrogen ions, that is, the concentration of hydrogen ions or H₃O⁺:
pH= - log [H⁺]= - log [H₃O⁺]
Definition of pOHSimilarly, pOH is a measure of hydroxyl ions in a solution and is expressed as the logarithm of the concentration of OH⁻ ions, with the sign changed:
pOH= - log [OH⁻]
Relationship between pH and pOHThe following relationship can be established between pH and pOH:
pOH + pH= 14
pOH and pH in this caseA solution has an [OH⁻] concentration of 1.20×10⁻⁷ M. Replacing in the definition of pOH:
pOH= - log (1.20×10⁻⁷ M)
Solving
pOH= 6.92
Then, pH is calculated as:
pH + 6.92= 14
pH= 14 - 6.92
pH= 7.08
Finally, the solution has a pOH of 6.92 and a pH of 7.08.
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If two gases a and b in separate 1 liter containers
The pressure exerted when both gases are put together in a single 1 liter container is 5 atm.
What is pressure?Pressure is the force exerted by any object on another object.
Given that, a and b separate 1 liter containers and exert pressure of 2 atm and 3 atm respectively.
When both gases a and b exert together, the pressure then
2 atm + 3 atm = 5 atm.
Thus, the pressure exerted when both gases are put together in a single 1 liter container is 5 atm.
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Braconid wasps lay eggs on the tomato hornworm caterpillar's body. The larvae that hatch from the eggs start feeding on the tissue of the caterpillar. What type of ecological relationship do both the organisms share?
Answer:
Braconid wasps lay eggs on the tomato hornworm caterpillar's body. The larvae that hatch from the eggs start feeding on the tissue of the caterpillar. What type of ecological relationship do both the organisms share?
