Formic acid, which is a component of insect venom, has a ka = 1. 8 ✕ 10-4. what is the [h3o ] in a solution that is initially 0. 10 m formic acid, hcooh?
The [H3O+ ] in a solution that is initially 0. 10 m formic acid, hcooh is 0.00415M.
What is formic acid?Formic acid is defined as the simplest carboxalic acid which contain one carbon atom. It is weak acid.
Another name of formic acid is methanoic acid. It is used as the preservation and antibacterial agent in livestock feed.Exposure to Formic Acid can cause headache, dizziness, nausea and vomiting. individuals, may cause a skin allergy.Thus we concluded from the image that the
concentration of [H30+] is 0.00413M.
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Carbon dioxide is considered a waste product of cellular respiration.
a. true
b. false
Answer: True
Explanation:
What is the relationship between cubic centimetres and millimetres
Answer:
1 cc always equals 1 mL.
Explanation:
The primary difference is that milliliters are used for fluid amounts while cubic centimeters are used for solids. No matter what is being measured.
Hope this helps you
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1.50 moles of N2 at 825 mmhg and 303 K are contained in a 34.3 L bottle. What is the pressure of the system if an additional 1.00 mole of gas is added to the bottle and the temperature is reduced to 273 K?
Answer:
1240 mmHg
Explanation:
Since volume is being held constant, we can use the following variation of the Ideal Gas Law to find the new pressure.
[tex]\frac{P_1}{T_1N_1}=\frac{P_2}{T_2N_2}[/tex]
In the equation, "P₁", "T₁", and "N₁" represent the initial pressure, temperature, and moles. "P₂", "T₂", and "N₂" represent the final pressure, temperature, and moles. Your answer should have 3 sig figs to match the sig figs of the given values.
P₁ = 825 mmHg P₂ = ? mmHg
T₁ = 303 K T₂ = 273 K
N₁ = 1.50 moles N₂ = 1.50 + 1.00 = 2.50 moles
[tex]\frac{P_1}{T_1N_1}=\frac{P_2}{T_2N_2}[/tex] <----- Formula
[tex]\frac{825 mmHg}{(303K)(1.50 moles)}=\frac{P_2}{(273 K)(2.50 moles)}[/tex] <----- Insert values
[tex]\frac{825 mmHg}{454.5}=\frac{P_2}{682.5}[/tex] <----- Simplify denominators
[tex]1.815=\frac{P_2}{682.5}[/tex] <----- Simplify left side
[tex]1238.86 mmHg={P_2}[/tex] <----- Multiply both sides by 682.5
[tex]1240 mmHg={P_2}[/tex] <----- Apply sig figs
Answer:1240
Explanation:
What is the C-terminal amino acid in the tetrapeptide
Val-Thr-Phe-Pro?
O threonine
O phenylaline
O valine
O proline
The C-terminal amino acid in the tetrapeptide is valine.
Valine is one of three branched-chain amino acids that enhance energy, increase endurance, and aid in muscle tissue recovery and repair. This group also lowers elevated blood sugar levels and increases growth hormone production.
The cease with a free carboxyl group is called the C-terminal amino acid residue. Peptides are named from the N-terminal acid residue to the C-terminal amino acid.
The C-terminal amino acid may be decided by way of addition of carboxypeptidases, enzymes which cleave amino acids from the C-terminal. A time direction ought to be carried out to look which amino acid is launched first.
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The C-terminal amino acid in the tetrapeptide is c) Valine.
The C-terminal amino acid is direct confirmation of the sequence of C terminal of the proteins that are expressed. It is present at the end of the protein sequence. A free carboxyl group is called the C-terminal amino acid residue.
A tetrapeptide is a chain containing four amino acids producing a Chain of amino acids.
Valine is three branched chain amino acids that is needed for protein synthesis. It enhances:
- Energy
- Muscle Growth
- Muscle Regeneration
- Increase endurance
- Muscle Recovery
Valine lowers elevated blood sugar levels. Also, it increases growth hormone production in the body.
Valine is found through following food:
MeatFishSoyDairyPeptides are named from the N-terminal acid residue present in the start to the C-terminal amino acid present at the end.
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Describe how the mass spectrometry readout is consistent with the chemical structure of hydrochloric acid.
The reading of mass so of hydrochloric acid involves sequence of analysis including:
Sample introductionAnalyte ionizationMass analysisIon detectionData processingThe chemical structure of hydrochloric acid is HCl
What is mass spectrometry?Mass spectrometry is defined as a special analytical technique that is used to measure the mass ratio of ions.
It is used to determine the masses of atoms of chemical elements
So therefore, the reading of mass so of hydrochloric acid involves sequence of analysis including:
Sample introductionAnalyte ionizationMass analysisIon detectionData processingLearn more about mass spectrometry:
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LOTS OF POINT PLS HELP!!!! What is the balanced, net ionic equation for the reaction shown below? HCI (aq) + NaOH (ag)-> NaCI (aq) +H2P(l)
The net ionic equation is written as H^+(aq) + OH^-(aq) -------> H2O(l)
What is the net ionic equation?The term net ionic equation refers to the equation that shows the ions that underwent a change in the reaction. We have to note that the reaction species here must be ionic species which are able to dissociate into ions in solutions.
Now the first step is to put down the molecular equation. The molecular equation shows the reaction of the compounds as follows;
HCI (aq) + NaOH (ag)-> NaCI (aq) +H2O(l)
Next, we put own the complete ionic reaction equation as follows;
H^+(aq) + Cl^-(aq) + Na^+(aq) + OH^-(aq) -------> Na^+(aq) + + Cl^-(aq) + H2O(l)
Next we have the net ionic equation;
H^+(aq) + OH^-(aq) -------> H2O(l)
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What is observed when magnesium is reacted with hydrochloric acid? choose all that apply
It is observed that when magnesium reacts with hydrochloric acid, it produces visible bubbles of hydrogen gas.
A vigorous reaction will occur giving rise of heat as it is an exothermic reaction. If heat is applied then it should be more vigorous.
Reaction is as follows:
Mg(s) + HCl (aq) --> MgCl2 (aq) + H2(g)
Magnesium reacts easily with HCl to produce H2 gas and magnesium ions, Mg2+, and heat. The reaction is exothermic, so it heats up quickly.
Mg(s) + HCl (aq) --> MgCl2(aq) + H2(g)
The net ionic equation :
Mg(s) + 2H+ --> Mg2 + H2(g)
If water is removed from the solution then white crystals of Mgcl2 is obtained.
Or in simple words,
2Mg + 2HCl -> 2Mg+ + 2Cl- + H2(gas)
The magnesium is attacked by the hydrochloric acid resulting in the magnesium dissolving into the solution resulting in a solution of magnesium chloride in hydrochloric acid and the production of hydrogen gas.
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One d orbital can
hold ___ electrons.
A. 2
B. 6
C. 10
D. 14
[tex]{ \red{ \tt{option \: (c)}}}[/tex]
Explanation:
One d orbital can hold 10 electrons.
The maximum number of electrons which can be hold by one d orbital is 10 electrons. It can hold less than 10 electrons in it's orbit but not more than 10 electrons. It's impossible to hold and never possible to hold more than 10 electrons in d orbital.
What type of reaction is: iron + sulfur -> iron sulfide? A. Double Replacement B. Decomposition C. Synthesis D. Combustion
Answer:
Hi there. In this question, we are trying to classify this reaction type. What we see happening here is we're told that we have sulfur which is in its solid state and it is reacting with solid iron And they're going to produce solid Iron three sulfide. So that is going to be f. E two S. Three. And that is a solid. I know it was F. E two S. Three because the iron three tells us the charge on the iron is three plus and sulfur voice forms ions with a too negative charge. Therefore it has to be FE two S 3. We can balance this equation although that's not necessary for this problem. But it's kind of quick. So I'll go ahead and do that. Okay, but we want to know what type of reaction it is. So we're looking for a pattern here when we see an element sulfur, it's combining with another element iron and it's producing a compound. So only one product. Alright, so looking at this general reaction type, there's only one reaction type of those five listed there, there's only one reaction type that has just one product and that is a synthesis reaction. A synthesis reaction follows this pattern where we are taking two or more simpler substances and combining them to make more complex compounds. Alright, with the simplest synthesis being element plus element equals compound. So this would be a synthesis reaction. Thank you for asking a question. And I hope this was helpful
Answer:
It should be D) Combustion Reaction
For the energy diagram of the chemical reaction depicted here, which statement is the best conclusion?
The reaction is endothermic.
The reaction is endothermic.
The reaction will proceed without the input of energy.
The reaction will proceed without the input of energy.
The reaction is exothermic.
The reaction is exothermic.
The activation energy is not represented on the graph.
The reaction shown here is an exothermic reaction.
What is an exothermic reaction?An exothermic reaction is one in which the energy of the reactants is greater than the energy of the products. This implies that energy is given out in the process. Whether a reaction is endothermic or exothermic shows in the nature of the reaction profile curve.
For an endothermic reaction, the part of the diagram that represents the energy of the products is higher than the part that represents the energy of the reactants. This is clear from the image attached here.
If we look at the reaction graph very well, we will observe that the energy of the reactants is far above that of the products. Thus it follows that the reaction shown here is an exothermic reaction.
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The ears work with the brain and other body parts through a series of steps that help
you hear the sound of a train coming. What step must happen before your brain recognizes that this is the sound of a train moving?
Your brain sends a message through the nerves to the muscles in your legs.
Your ears send a message through the nerves to the brain.
Your leg muscles pull on the bones as you move out of the way.
Your eyes pick up the sound waves as you see the train coming.
NEED HELP ASAP 23 POINTS PLS HELP FAST
Answer: B: Your ears send a message through the nerves to the brain.
Answer:
B!!!!
Explanation:
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The solutions that are used in this experiment have alcohols as both the solvent and the reactant. How is the excess alcohol removed?.
Excess alcohol is removed by Vacuum filtration.
What is vacuum filtration?Vacuum filtration is a methodology where a tension differential is kept up with across the channel medium by clearing the air beneath the channel paper. Vacuum filtration gives a power on the arrangement notwithstanding that of gravity and builds the pace of filtration. Vacuum filtration is the standard strategy utilized for isolating a strong fluid blend when the objective is to hold the strong (for instance in crystallization).How do you dry a product after vacuum filtration?The strong can be dried rapidly by washing the strong with an unpredictable fluid (methanol, CH3)2CO, or ether are normal) that the strong won't break up in. In the event that the filtrate is to be gathered, change the getting jar prior to washing.To learn more about vacuum filtration from the given link
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What products are formed in the following reaction
The correct product from this reaction is the structure in option D.
What is a secondary amine?An amine is a compound that contains an alkyl group and an amino group. We know that we can obtain an amine from ammonia by replacing one or more hydrogen atoms with alkyl groups.
The compound as shown here is a secondary amine because two hydrogen atoms have been replaced with alkyl groups. We know that the reaction between the HCl and the amine produces an ionic compound owing to the fact that the nitrogen and the hydrogen from HCl are involved in a Dative bond.
As such, the correct product from this reaction is the structure in option D.
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A particular buffer solution consists of a weak acid and its conjugate base. How could this buffer solution be modified so as to increase its buffer capacity against added base?
The only way increase the buffer capacity is to increase the total concentration of the system (conjugated acid + base).
What is buffer capacity?
The buffer capacity can be defined as the amount of strong base needed to change the pH of 1 liter of solution by 1 pH unit.
To increase buffer capacity to modify buffer solution-
The buffer capacity of a buffer, consisting of a weak acid and its conjugated base is given by the following equation:
π=㏑ 10 [{H⁺} + K ÷ H⁺ + CKα [H⁺] ÷ [H⁺] + Kα]
With [H^+] the concentration of the H^+ ion ; C the total buffer concentration (i.e. acid + conjugated base) and Kα the acidity constant.
It is clear from this equation that the buffer capacity is directly proportional to the concentration.
So the only way increase the buffer capacity is to increase the total concentration of the system (conjugated acid + base).
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If 36. 0 ml of 0. 20 m hcl is added to 30. 0 ml of 0. 40 m naoh, what will be the ph of the resulting solution?
The pH of the resulting solution is 2.05
Sodium hydroxide and hydrochloric acid neutralize each other in a 1:1 mole ratio as described by the balanced chemical equation
[tex]NaOH_{(aq)} + HCL_{(aq)}[/tex] → [tex]NaCl_{(aq)} + H_2O_{(aq)}[/tex]
This means that a complete neutralization, which would result in a neutral solution, i.e. a solution that has pH=7 at room temperature, requires equal numbers of moles of sodium hydroxide and hydrochloric acid.
Notice that your two solutions have equal molarities, but that the volume of the hydrochloric acid solution is 1.2 times larger than the volume of the sodium hydroxide solution. This implies that the number of moles of hydrochloric acid is 1.2 times bigger than the number of moles of sodium hydroxide.
This means that after the reaction is complete, you will be left with excess hydrochloric acid → the pH of the resulting solution will be <7.
Now, the number of moles of hydrochloric acid that will not take part in the reaction is given by
= moles of HCL added - moles of NaOH added
= 36 × [tex]\frac{0.100 moles HCL}{10^3 ml}[/tex] - 30 × [tex]\frac{0.100 moles HCL}{10^3 ml}[/tex]
= [tex]\frac{6* 0.100 moles}{10^3}[/tex]
The total volume of the resulting solution will be = ( 30 + 36 ) mL
= 66 mL
Since hydrochloric acid is a strong acid that ionizes in a 1:1 mole ratio to produce hydronium cations, you can say that the concentration of hydronium cations in the resulting solution will be
[tex][ H_3O^+] = \frac{\frac{6*0.100}{10^3} }{66*10^3}[/tex]
[tex][ H_3O^+] = \frac{6*0.100}{66}[/tex]
pH = - log [tex](\frac{6*0.100}{66} )[/tex]
pH = 2.05
Therefore, the pH of the resulting solution is 2.05.
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Which carboxylic acid derivative can be made from another carboxylic acid derivative by a dehydration reaction?
Acid nitric oxide
When a carboxylic acid combines with an acid chloride in the presence of a base, anhydrides are frequently produced.
The Fischer esterification, which involves reacting a carboxylic acid with an alcohol to produce an ester: RCO2H + R′OH RCO2R′ + H2O, is a well-known example of a dehydration reaction. The presence of a dehydrating agent, or a chemical that reacts with water, is frequently necessary for these processes.
Although an ester is produced when an acyl chloride and an alcohol react, this conversion cannot be stopped by adding HCl to the reaction mixture. One of the most popular carboxylic derivatives is esters.
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You are asked to weigh approximately 0. 4g of acetylsalicylic acid to the nearest mg. When you enter the data in grams in your lab notebook, how many significant figures will you record ?.
Number of significant figures will be 1.
Given:
weight of acetylsalicylic acid = 0. 4g
Significant figures are the digits of value which carry meaning towards the resolution of the measurement. They are also called significant figures in chemistry. All the experimental measurements have some kind of uncertainty associated with them.
When we convert 0.4g acetylsalicylic acid to mg we get value 400mg
when we convert 400mg to gram we get value of 0.4 gram
Since 0 before a decimal is not significant so there is only one significant figure that is 4.
How do you determine the number of significant figures?The zero to the left of a decimal value less than one is meaningless.All trailing zeros that are placeholders are meaningless.The presence of zeros between non-zero numbers is significant.Non-zero numbers are all significant.If a number contains more digits than the desired number of significant digits, it is rounded.Why 'Hidden Figures' is so important?It's an important story for a variety of reasons, and it comes at a time when people are looking to Hollywood more than ever to tell stories that represent them. Hidden Figures is that movie for many, and it's critical that everyone sees these women in action. This is why. This film tells a story that you've probably never heard before.
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1.07 option 1 -- laboratory techniques lab report anybody got this lab filled out for me?
For this reason, chromatographic methods such as liquid, gas, or high-performance liquid chromatography are typically used in laboratories, with spectroscopic methods such as UV-visible spectroscopy, NMR, or MS being used for detection.
What purpose do laboratory methods serve?The use of laboratory methods is crucial to a researcher's career. These abilities are essential for carrying out various studies and examinations. One cannot use these strategies in projects or research without the necessary understanding. The majority of experiments require these procedures.
An lab report is what?A lab report describes an experiment and any findings that were made as a result of the experiment. The three major goals of a lab report are to: clearly explain the results of an experiment by giving data. talk about the outcomes.
What is the name of a lab report?Experimental reports, commonly referred to as "lab reports," are summaries of the writers' own empirical study. An experimental report should be viewed as a "narrative" of your research that guides the reader through your experiment.
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1. In a 16 gram sample, how many grams of the parent isotope will be left after 3 half-lives?
A. 2
B. 3
C. 8
D. 16
2. Complete the balanced nuclear reaction below.
/64 → /62 + ?
A. 1n 0
B. 0e −1
C. 4He 2
D. 147Eu
3. How does the trend of proton-to-neutron ratio change as elements become heavier?
A. Elements continue to have an equal number of protons and neutrons.
B. Heavier elements have a great number of protons per neutron.
C. Heavier elements have a greater amount of neutrons per proton.
D. There is no trend between the ratio and the mass of the element.
4. A compound of multiple atom types has less mass than those of the individual atoms they are made of. What accounts for the missing mass?
A. Gamma decay
B. Chain reactions
C. Energy stored in electron bonds
D. Energy stored in the bonds in the nucleus
5. Carbon-14 decays to carbon-12 with a half-life of 5,730 years. How old is a carbon sample containing 3 grams of carbon-14 and 9 grams of carbon-12?
A. 5,730 years
B. 11,460years
C. 17,190years
D. 22,920 years
6. A major argument against nuclear power plants is that they:
A. Produce radioactive waste materials.
B. Release large amounts of carbon dioxide into the atmosphere.
C. Generate less electricity than other types of power plants.
D. Can’t be used at night.
7. A common source of radiation that humans are exposed to come from:
A. Eatingfood
B. An x-ray examination
C. Outer space
D. All of the above
8. Complete the following balanced nuclear reaction.
/92+/0→/36+ 1/0+?
A. 4He 2
B. 0e −1
C. 143Ba 56
D. 144Xe 54
Based on the half-life of the radioactive sample and the properties of nuclear reactions, the correct options are:
option Aoption Coption Coption Doption Boption A.option C.option CWhat is half-life?Half-life is the time taken for half the amount of atoms in an a radioactive element to decay.
1. After three half-lives, (1/2)³ of the original amount will remain = 1/8
1/8 of 16 = 2 ; option A
2. The balanced nuclear equation is given below:
action below:
/64 → /62 + 4He 2 ; option C
3. The trend of proton-to-neutron ratio as elements become heavier is that heavier elements have a greater amount of neutrons per proton; option C
4. The loss in mass of a compound composed of multiple atom types than those of the individual atoms they are made of is due to energy stored in the bonds in the nucleus known as the binding energy; option D
5. Initially, 12 g of carbon-14 was present
After one half-life, 6 g of carbon-14 remained, and 6 g of carbon-12 was present.
After two half-lives, 3 g of carbon-14 remained, and 9 grams of carbon-12 was present.
Age of the carbon sample = 5730 * 2 = 11460 years; option B
6. A major argument against nuclear power plants is that they produce radioactive waste materials; option A.
7. A common source of radiation that humans are exposed to come from outer space in the form of ultraviolet rays; option C.
8. The balanced nuclear reaction is:
/92+/0 → /36+ 1/0 + 143Ba 56 ; option C
In conclusion, nuclear reaction results in changes in the nucleus of atoms.
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Why isn't the ph at the equivalence point always equal to 7 in a neutralization titration?
The pH at the equivalence point always not equal to 7 in a neutralization titration when titration occur between weak acid and weak base , strong acid and weak base or strong base weak acid. The reason behind it is given as,
At equivalence point the product is present by reacting from acid and base. So, when weak acid titrate with strong base then the solution will be weak base at equivalence point.When strong acid is neutralize with strong base then it form neutral product at the equivalence point. Hence the final conclusion is that the pH of the solution in which titration is takes place between strong acid and strong base is 7 that is neutral left titration between all type of acids and bases ha pH not equal to 7 .
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What is the percent yield when 68. 5 kg of carbon monoxide is reacted with 8. 60 kg of hydrogen gas to produce methanol (ch3oh)? the actual yield of methanol was 3. 57 x 104 g
Hence the percent yield of methanol is 51.45%
Step 1: Convert Kg into g
68.5 Kg CO = 68500 g CO
8.60 Kg H₂ = 8600 g
Step 2: Find out the Limiting reactant;
The Balance Chemical Equation is as follows;
CO + 2 H₂ → CH₃OH
According to Equation,
28 g (1 mol) CO reacts with = 4 g (2 mol) of H₂
So,
68500 g CO will react with = X g of H₂
Solving for X,
X = (68500 g × 4 g) ÷ 28 g
X = 9785 g of H₂
It shows that 9785 g H₂ is required to react with 68500 g of CO but we are provided with 8600 g of H₂ which is less than required. Therefore, H₂ is provided in less amount hence, it is a Limiting reagent and will control the yield of products.
Step 3: Calculate Theoretical Yield
According to the equation,
4 g (2 mol) H₂ reacts to produce = 32 g (1 mol) Methanol
So,
8600 g H₂ will produce = X g of CH₃OH
Solving for X,
X = (8600 g × 32 g) ÷ 4 g
X = 68800 g of CH₃OH
Step 4: Calculate %age Yield
%age Yield = Actual Yield ÷ Theoretical Yield × 100
Putting Values,
%age Yield = 3.54 × 10⁴ g ÷ 68800 g × 100 = 51.45 %
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1) Calculate the empirical formula for a chemical compound that gives the following analysis: 66.6 g titanium and 33.4 g oxygen.
a) Ti_2O_3
b) Ti_2O
c) TiO_3
d) Ti_2
2) The empirical formula for a compound shows the symbols of the elements with subscripts indicating what?
a) actual numbers of atoms in a molecule
b) number of moles of the compound in 100 g
c) smallest whole-number ratio of the atoms
d) atomic masses of each element
3) In the tin oxide laboratory activity, what was the color of the vapor emitted when the nitric acid was added to the tin?
a) orange-brown
b) pink
c) green
d) blue
4) What is the empirical formula for a compound that is 36.6 percent potassium, 33.2 percent chlorine, and 29.9 percent oxygen?
KClO_2
KClO_3
K_2Cl_2O
K_2Cl_2O_5
5) What is the empirical formula for a compound that is 43.6 percent phosphorus and 56.4 percent oxygen?
P_3O_7
PO_3
P_2O_3
P_2O_5
1. The empirical formula of the compound is Ti₂O₃
2. The correct answer to the question is: smallest whole-number ratio of the atoms (Option C)
3. The correct answer to the question is: orange-brown (Option A)
4. The empirical formula of the compound is KClO₂
5. The empirical formula of the compound is P₂O₅
1. How to determine the empirical formulaTi = 66.6 gO = 33.4 gEmpirical formula =?Divide by their molar mass
Ti = 66.6 / 48 = 1.3875
O = 33.4 / 16 = 2.0875
Divide by the smallest
Ti = 1.3875 / 1.3875 = 1
O = 2.0875 / 1.3875 = 3/2
Multiply by 2 to express in whole number
Ti = 1 × 2 = 2
O = 3/2 × 2 = 3
Thus, the empirical formula of the compound is Ti₂O₃
2. What is empirical formula?This is the simplest formula of a compound which shows the smallest whole number ratio of the atoms present in the compound
With the above definition, we can conclude that the correct answer to the question is: smallest whole-number ratio of the atoms (Option C)
3. What colour is shown when nitric acid is added?In the tin oxide laboratory activity, the colour of the vapor emitted when nitric acid is added to the tin is: orange-brown
NOTE: This colour is visible when we carryout the practical experiment
Thus, the correct answer to the question is orange-brown (Option A)
4. How to determine the empirical formulaK = 36.6%Cl = 33.2%O = 29.9%Empirical formula =?Divide by their molar mass
K = 36.6 / 39 = 0.9385
Cl = 33.2 / 35.5 = 0.907
O = 29.9 / 16 = 1.8688
Divide by the smallest
K = 0.9385 / 0.907 = 1
Cl = 0.907 / 0.907 = 1
O = 1.8688 / 0.907 = 2
Thus, the empirical formula of the compound is KClO₂
5. How to determine the empirical formulaP = 43.6%O = 56.4%Empirical formula =?Divide by their molar mass
P = 43.6 / 31 = 1.406
O = 56.4 / 16 = 3.525
Divide by the smallest
P = 1.406 / 1.406 = 1
O = 3.525 / 1.406 = 5/2
Multiply by 2 to express in whole number
P = 1 × 2 = 2
O = 5/2 × 2 = 5
Thus, the empirical formula of the compound is P₂O₅
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An ideal reversible heat pump is taking heat from the outside air at -14.0°c and discharging it into the house at 20.0°c. what is the coefficient of performance of this heat pump?
the coefficient of performance of this heat pump is 8.61.
What is Heat pump ?
The air source heat pump converts heat from the ambient air into a low-temperature liquid refrigerant. The pump compresses the liquid to raise its temperature using power. To release the heat it had been holding, it then condenses back into a liquid. Your underfloor heating system or radiators get heat.
coefficient of performance -The usable heating or cooling delivered to work (energy) needed ratio, also known as the coefficient of performance, or COP, of a heat pump, refrigerator, or air conditioning system. Higher efficiency, less energy (power) usage, and thus reduced operational costs are all related to higher COPs.
temperature of cold reservoir = -14.0°C
Tc = [ 273+ (-14.0)]K = 259K
temperature of hot reservoir = 20°C
Th = [ 273+ (20)]K = 293K
therefor, formula for coefficient of performance
Cop = Th/Th-Tc
Cop = 293/34
Cop = 8.61
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During an experiment a thermometer was placed in a beaker containing hydrogen peroxide. The following observations were recorded when yeast granules were added to hydrogen peroxide.
Observation 1: Fizzing and bubbling took place.
Observation 2: The temperature began to rise.
Based on the observation, justify the type of change (physical or chemical) that took place
The states of matter change to produce the same or the new substance. When yeast is added to hydrogen peroxide bubble of carbon dioxide is formed which indicates chemical change.
What is a chemical change?A chemical change is the formation of a new substance by the chemical alterations in the reactants. The yeast releases products of cellular respiration that react with hydrogen peroxide.
The reaction is exothermic as it releases heat and increases the temperature when measured by the thermometer. The Fizzing and bubbling occur when carbon dioxide reacts with H₂O₂ to produce a new substance.
Therefore, addition of yeast to hydrogen peroxide is a chemical change.
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Answer:
The type of change that took place is most likely a chemical change, due to the recordable reactivity of the hydrogen peroxide to the yeast granules in the experiment.
Explanation:
As stated in the question, the hydrogen peroxide started fizzing and bubbling in reaction to the yeast granules, which is already a sign of a chemical change. The question also states that there was an increase in temperature. This is another sign of a chemical change. Hope this helped (;
Write the empirical formula for at least four ionic compounds that could be formed from the following ions:
Answer:
Fe(C₂H₃O₂)₃, Fe(CN)₃, Pb(C₂H₃O₂)₄, Pb(CN)₄
Explanation:
Cations (positively charged ions) can only form ionic bonds with anions (negatively charged ions). However, you can't just simply put one cation and one anion together to form a compound. Each compound needs to been neutral, or have an overall charge of 0. When cations and anions do not have charges that perfectly cancel, you need to modify the amount of each ion in the compound.
1.) Fe(C₂H₃O₂)₃
-----> Fe³⁺ and C₂H₃O₂⁻
-----> +3 + (-1) + (-1) + (-1) = 0
2.) Fe(CN)₃
-----> Fe³⁺ and CN⁻
-----> +3 + (-1) + (-1) + (-1) = 0
3.) Pb(C₂H₃O₂)₄
-----> Pb⁴⁺ and C₂H₃O₂⁻
-----> +4 + (-1) + (-1) + (-1) + (-1) = 0
4.) Pb(CN)₄
-----> Pb⁴⁺ and CN⁻
-----> +4 + (-1) + (-1) + (-1) + (-1) = 0
At constant temperature and pressure the gibbs free energy value is a measure of the __________ of a process.
At constant temperature and pressure the gibbs free energy value is a measure of the spontaneity of a process.
At constant temperature and pressure the gibbs free energy value is zero and when gibbs free energy value is zero then the process is spontaneous . The meaning of spontaneous is that the process is takes place smothly with any effect and itself .
The Gibbs free energy also known as Gibbs function , Gibbs energy or free enthapy . It is a quantity that is used to measure maximum amount of work done in a thermodynamic system when temperature and pressure is keep constant.
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A 0. 462 g sample of a monoprotic acid is dissolved in water and titrated with 0. 180 m koh. what is the molar mass of the acid if 28. 5 ml of the koh solution is required to neutralize the sample?
The molar mass of the acid if 28. 5 ml of the koh solution is required to neutralize the sample is 90.23g/mol.
For the calculation of molarity of solutionMolarity = (moles of solute/volume of solution) × 1000
Given,
Molarity of KOH solution = 0.180 M
Volume of solution = 28.5 mL
0.180 = (moles of KOH/ 28.5) × 1000
Moles = (0.18× 28.5)/1000
= 0.00513 mol
Chemical equation for the reactionHA + KOH ------- KA + H2O
1 moles of KOH reacts with 1 moles of HA.
So, 0.00513 moles of KOH react with 0.00513 moles of HA.
To calculate the molar mass for given number of molesNumber of moles= given mass/ Molar mass
Given,
Mass of HA = 0.462 g
Moles of HA = 0.00512 mol
0.00512 = 0.462/ Molar mass
Molar mass = 90.23 g/ mol.
Thus the molar mass of HA required to neutralize the 28.5 mL of KOH is 90.23g/mol.
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48. Which of the following (a) KCI (b) NaCl is called Sylvine? (c) CaCl₂ (d) MgCl₂
Answer:
(a) KCI
sylvine, is potassium chloride (KCl) in natural mineral form
Are there other tests that could be used to determine if cyclohexanol is present in your product? give at least one test with some detail of what you would expect
Out of the many tests that is used to determine the presence of cyclohexanol in a product is the Lucas test.
The Lucas test is a chemical reactant that is used to identify the presence and level of alcoholism in a given solution. Cyclohexanol shows many chemical properties as do most substances, one of those property is the presence of an alcohol group.
The presence of this chemical group makes it possible to test for cyclohexanol using the Lucas test. The Lucas test will cause reactions in the presence of alcohol and convert alcohols into chloroalkanes, which is nearly insoluble in aquatic solutions.
From above, we concluded that a positive result will look like the solution separates into a cloudy chloroalkane-containing part on top of a much clearer layer.
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