Answers
Answer
c = 1.380 J/g°C
Explanation
Given:
Mass of sample, m = 10 g
Initial temperature, T₁ = 10 °C
Final temperature, T₂ = 81 °C
Change in temperature, ΔT = T₂ - T₁ = 81 °C - 10 °C = 71 °C
Quantity of heat, Q = 980J
What to find:
The specific heat, c of the material.
Step-by-step solution:
The specific heat, c of the material can be calculated using the formula given below:
\(\begin{gathered} Q=mc\Delta T \\ \\ \Rightarrow c=\frac{Q}{m\Delta T} \end{gathered}\)Plugging the values of the parameter, we have;
\(c=\frac{980J}{10g\times71°C}=\frac{980J}{710\text{ }g°C}=1.380\text{ }J\text{/}g°C\)Therefore, the specific heat, c of the material is 1.380 J/g°C
Related Questions
write the structural formula for 2-bromo-3-chloro-4,4-dimethylpentanal
Answers
Answer:
Br-CH2-CH(CH3)2-C(Cl)H-CH(CH3)2-CHO
Explanation:
The molecule has a total of 14 carbon atoms, 13 hydrogen atoms, and 1 bromine atom. The carbon atoms are arranged in a chain with a methyl group attached to the second carbon atom, a chlorine atom attached to the third carbon atom, and two methyl groups attached to the fourth carbon atom. The fifth carbon atom has a carbonyl group attached to it.
The molecule is an aldehyde, which means that it has a carbonyl group (C=O) at the end of the chain. The carbonyl group is polar, and the oxygen atom has a partial negative charge. The hydrogen atom has a partial positive charge. This polarity makes the aldehyde group susceptible to nucleophilic attack.
The bromine and chlorine atoms are both electrophilic, which means that they have a partial positive charge. This makes them susceptible to nucleophilic attack.
The methyl groups are non-polar and do not have any significant reactivity.
The molecule is a chiral molecule, which means that it has a mirror image that is not superimposable on itself. This is because the carbon atom with the carbonyl group is attached to four different groups.
The molecule is a liquid at room temperature and has a strong odor. It is used in a variety of products, including perfumes, flavorings, and plastics.
How many moles of carbon dioxide gas is there when 2.3g of sodium bicarbonate decomposes
to produce carbon dioxide and sodium hydroxide? NaHCO3 à NaOH + CO2
Answers
Total, 0.0137 moles of carbon dioxide gas is produced when 2.3 g of sodium bicarbonate decomposes to produce carbon dioxide and sodium hydroxide.
To determine the number of moles of carbon dioxide gas produced, we first need to find the balanced chemical equation for the reaction;
2NaHCO₃ → Na₂CO₃ + CO₂ + H₂O
From this equation, we can see that for every 2 moles of sodium bicarbonate, 1 mole of carbon dioxide is produced.
Next, we need to calculate the number of moles of sodium bicarbonate in 2.3 g using its molar mass;
molar mass of NaHCO₃ = 84.0066 g/mol
moles of NaHCO₃ = mass/molar mass
= 2.3 g / 84.0066 g/mol = 0.0274 mol
Finally, we can use the mole ratio from the balanced equation to find the number of moles of carbon dioxide produced;
moles of CO₂ = (0.0274 mol NaHCO₃) x (1 mol CO₂ / 2 mol NaHCO₃)
= 0.0137 mol CO₂
Therefore, 0.0137 moles of carbon dioxide gas is produced.
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How do the terms genotype and phenotype relate?
O Both are sets of alleles that define traits.
O An organism's phenotype leads to its genotype.
O An organism's genotype leads to its phenotype.
Both are terms for observable traits
Answers
Answer:
c is the
Explanation:
EXPERIMENT
You have learned that carbon dioxide is a compound consisting of two atoms of oxygen united with one atom of carbon. This substance is a gas which you exhale (breathe out) as waste material. In this experiment, you will combine carbon dioxide with limewater (calcium hydroxide) to make a new compound called calcium carbonate. You may do this experiment as required with the supplies listed below, or watch the video demonstration.
Answers
Answer:
6
Explanation:
I somehow know just cause im smart and stuff.
Which are ways to ensure that temperature readings are accurate? Check all that apply. shaking the thermometer before use using the thermometer as a stirring rod making sure the liquid inside the thermometer is at eye level when taking the temperature making sure the bulb of the thermometer does not touch the bottom of the beaker or the ice when taking the temperature using the Celsius scale instead of the Fahrenheit scale when taking temperature readings
Answers
Answer:
Explanation:
making sure the liquid inside the thermometer is at eye level when taking the temperature
making sure the bulb of the thermometer does not touch the bottom of the beaker or the ice when taking the temperature
Solar and wind energy are both intermittent resources that cannot be relied upon for a constant stream of energy production. Explain why developing better ways to store energy is an important part of making these energy sources more practical to use.
Answers
By removing the need to build additional transmission lines and equipment, energy storage may reduce costs for utilities and their customers.
By removing the need to build additional transmission lines and equipment, energy storage may reduce costs for utilities and their customers. Energy storage's inherent ability to offer backup power in the event of grid failure is a feature that both residential consumers and commercial owners find highly desirable.
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g draw all possible stereoisomers of stilbene dibromide, making sure to draw each stereoisomer only once. id all pairs of enantiomers and any meso compounds. assign r/s configuration to all stereocenters on your drawings.
Answers
Stilbene dibromide includes (1R,2S)-1,2-dibromo-1,2-diphenylethane, (1R,2R)-1,2-dibromo-1,2-diphenylethane, (1S,2S)- It has three stereoisomers. 1,2-dibromo-1,2-diphenylethane.
Bromination of trans-stilbene primarily yields meso-1,2-dibromo-1,2-diphenylethane. Electrophilic bromine addition reaction. Stilbenes can exist as both trans and cis stereoisomers, but they naturally occur predominantly as the trans isomer due to their greater thermodynamic stability compared to the cis isomer.
If a molecule has two stereocenters there should be four possible stereoisomers. If a molecule has 3 stereocenters, there should be up to 8 stereoisomers. Therefore, the maximum number of stereoisomers for a given configuration is 2n. where n is the number of chiral centers.
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A solution containing more solute than the equilibrium amount is called A solution containing more solute than the equilibrium amount is called an unsaturated solution. a dilute solution. a supersaturated solution. a concentrated solution. a saturated solution.
Answers
Answer:
a supersaturated solution.
Explanation:
Dissolution can be defined as the process of dissolving or dissociating a solute in solid, liquid or gaseous phase into fragmented particles by a solvent in order to form a solution.
In Chemistry, a solute can be defined as a substance that is typically dissolved in a liquid solvent such as water, coffee, tea, etc., to produce a solution.
For dissolution to occur in solids, the crystalline structure of the substance must be broken up so as to release ions, atoms or molecules to produce a solution.
For liquid and gases, the substance to be dissolved must form a non-covalent bond with the solvent to produce a solution.
During the process of dissolution, a solute maybe completely ionized, partially ionized, or it may remain intact.
Generally, when a solution contains more solute than the equilibrium amount it's called a supersaturated solution.
However, when a solution contains lesser solute than the equilibrium amount it's called an unsaturated solution.
Also, when a solution is in dynamic equilibrium with the dissolved solute, it's called a saturated solution.
Which of the following are correct statements about reactions?
Check all that apply.
A. There are reactions that occur more slowly than others.
B. Reactions are all very fast and explosive.
C. A catalyst cannot lower the activation energy of a reaction.
D. Catalysts are not used up by a reaction.
Answers
Answer:
A
Explanation:
I took this test before and got a 100%
In which way are photosynthesis and cellular respiration different?
A.
Cellular respiration stores ATP, while photosynthesis releases ATP.
B.
Cellular respiration produces oxygen, while photosynthesis uses oxygen.
C.
Photosynthesis releases energy, while cellular respiration stores energy.
D.
Photosynthesis used carbon dioxide, while cellular respiration produces carbon dioxide.
Answers
Answer:
D. Photosynthesis uses carbon dioxide while cellular produces carbon dioxide
I need help with something
Answers
To calculate the percent yield of a reaction, you have to calculate limitant and excess first of the reaction:
6CO2 + 6H2O + light -> C6H12O6 + 6O2
We have 18.6 moles of CO2 and 238g of H2O
Finding the number of moles of water will help us find the limitant of the reaction
nH2O = mH2O/Molar mass of H2O
nH2O = 238g/18.01g/mol
nH2O = 13.2 moles
So if we have 6 moles of water we will end up with 1 mole of C6H12O6, when we have 13.2 moles, we will have 2.2 moles of C6H12O6
6moles = 1 mol
13.2 moles = x
x = 2.2 moles
The molar mass of C6H12O6 is 180.156 for each mole, since we have 2.2 moles, the final mass will be 396.34 grams
To find the percent yield we have to calculate the actual yield divided by the theoretical yield and then multiply by 100
% yield =( 30g/396.34g) * 100
% yield = 7.6%
What is the wavelength of a 3 x 1012 Hz infrared wave?
A. 3 x 10-3 m
B. 1x 104 m
C. 3 x 1020 m
D. 1 x 10-4 m
SUBMIT
Answers
Answer:
D
Explanation:
wavelength = speed of light/ frequency
= (3 x 10^8 m/s) / (3 x 10^12 Hz)
= 1 x 10^-4 m
Using the law of the conservation of energy, types of energy transformations may occur in each
scenario below.
a. Logs burn in a fire
b. A waterfall turns the turbine to create electricity
c. A battery is used to power a flashlight
Answers
Types of energy transformations that may occur in each are heat, light, mechanical to electric, and chemical into heat and light energy.
a. Logs burn in a fire - chemical energy in the wood into heat and light energy.
b. A waterfall turns the turbine to create electricity - mechanical energy into hydroelectric energy.
c. A battery is used to power a flashlight - chemical energy into heat and light energy.
Even with the burning of timber, the chemical electricity within the wood is launched as warm due to the chemical response of wood and oxygen. This form of a chemical reaction is known as combustion and it calls for oxygen. Combustion converts the saved chemical strength inside the wood into heat and light electricity.
The regulation of conservation of power states that the amount of power is neither created nor destroyed. for example, while you roll a toy car down a ramp and it hits a wall, the power is transferred from kinetic power to capability electricity. Hydroelectric strength is additionally called hydroelectric electricity or hydroelectricity.
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Students set up the stream table apparatus seen here. They began their experimentation with trials to determine the
velocity of a stream at various inclines. Students measured the length of the stream from the head to the mouth of
the stream. They began with one block under the head of the stream table. A steady flow of water was directed
through the opening at the head of the stream. Once the water was flowing, a cork with a string attached was placed
at the headed of the stream. Students timed the movement of the cork from the head to the mouth. They ran three
trials and found the average speed of the cork. They repeated the procedure for a 2-block raise and a 3-block raise.
The results of the students trials can be seen in the data table. Describe the relationship between stream velocity and
incline.
-
A)
There is an inverse relationship between stream velocity and incline of the
stream table.
The greater the incline of the stream table, the greater the velocity of the
stream.
B)
The velocity of the water is not related to the incline of the stream table.
D)
There is a direct proportion between incline and velocity.
Answers
Answer:
A) There is an inverse relationship between stream velocity and incline of the
stream table. The greater the incline of the stream table, the greater the velocity of the
stream.
Explanation:
I believe this to be the answer.
Answer: The greater the velocity of moving water, the greater the kinetic energy and the more sediment moved to the mouth.
Explanation: I took the test
The bright-line spectra of four elements, G,J, L, and M, and a mixture of at
least two of these elements are given below.
Which elements are present in the mixture?
M
Mixture
750
750
G and J
G and L
M, J, and G
M, J, and L
700
700
650
650
Bright-Line Spectra
600
600
550 500
550
Wavelength (nm)
500
450
450
400
400
.
Answers
Based on the given bright-line spectra and the observed wavelengths in the mixture's spectrum, the elements G and J are the ones present in the mixture.
From the given bright-line spectra and the spectrum of the mixture, we can determine the elements present in the mixture by comparing the specific wavelengths observed. Examining the bright-line spectra, we can identify that G has a distinct wavelength at 650 nm, J at 600 nm, L at 550 nm, and M at 500 nm.
Looking at the spectrum of the mixture, we can observe two prominent wavelengths, 650 nm and 600 nm. These correspond to the wavelengths of G and J, respectively. Since the spectrum of the mixture does not exhibit the wavelengths specific to L (550 nm) or M (500 nm), we can conclude that only G and J are present in the mixture.
Therefore, based on the given bright-line spectra and the observed wavelengths in the mixture's spectrum, the elements G and J are the ones present in the mixture.
This analysis relies on the principle that each element has characteristic wavelengths at which they emit light. By comparing the observed wavelengths in the mixture's spectrum with those of the individual elements, we can determine the elements present in the mixture.
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When a hydrocarbon fuel is burned, almost all of the carbon in the fuel burns completely to form CO2 (carbon dioxide), which is the principal gas causing the greenhouse 102 ENERGY, ENERGY TRANSFER effect and thus global climate change. On average, 0.59 kg of CO2 is produced for each kWh of electricity generated from a power plant that burns natural gas. A typical new household refrigerator uses about 700 kWh of electricity per year. Determine the amount of CO2 production that is due to the refrigerators in a city with 300,000 households.
Answers
Answer:
1.239 * 10^8 Kg
Explanation:
Since all the electricity consumed comes from natural gas;
amount of electricity consumed = 700 * 300,000 = 2.1 * 10^8 kWh
So, amount of CO2 consumed is given by;
amount of electricity consumed * amount of CO2 per kWh
Hence,
Amount of CO2 = 2.1 * 10^8 kWh * 0.59 = 1.239 * 10^8 Kg
A compound is found to contain 9.227 % boron and 90.77 % chlorine by mass. What is the empirical formula for this compound?
Answers
Assuming a 100 g sample of the compound, we can convert the mass percentages to masses in grams:
- 9.227 g B
- 90.77 g Cl
Next, we need to convert these masses to moles using the atomic masses of the elements:
- B: 10.81 g/mol
- Cl: 35.45 g/mol
- 9.227 g B ÷ 10.81 g/mol = 0.853 mol B
- 90.77 g Cl ÷ 35.45 g/mol = 2.562 mol Cl
Now we need to divide both mole values by the smaller of the two, which is 0.853 mol:
- 0.853 mol B ÷ 0.853 mol = 1.000 mol B
- 2.562 mol Cl ÷ 0.853 mol = 3.000 mol Cl
This gives us a B:Cl ratio of 1:3. The empirical formula for the compound is therefore BCl3.
Answer:
Empirical formula of a compound means that it provides simplest ratio of whole number.
Explanation:
Mass of boron and chlorine is 9.224% and 90.74%
If HSO3^- behaves as an acid in water, what products will form?
Answers
HSO3^- is the conjugate base of H2SO3 (sulfurous acid). When it dissolves in water, it behaves as an acid. In other words, it donates a proton (H+) to a water molecule, producing hydronium ions (H3O+) and sulfite ions (SO32-). Therefore, the products that form when HSO3^- behaves as an acid in water are H3O+ (hydronium ion) and SO32- (sulfite ion).
The chemical reaction can be represented as follows:HSO3^- + H2O → H3O+ + SO32-This is an example of an acid-base reaction, in which HSO3^- is the acid and water is the base. The HSO3^- donates a proton to the water molecule, which acts as a base by accepting the proton to form H3O+.
This reaction is reversible, meaning that H3O+ can also act as an acid by donating a proton to the SO32- ion to reform HSO3^-.The sulfite ion (SO32-) is a weak base and can also react with water to form the hydroxide ion (OH-). This reaction can be represented as follows:SO32- + H2O → HSO3^- + OH-
Overall, when HSO3^- behaves as an acid in water, the products that form are H3O+ and SO32-. This reaction is an example of an acid-base reaction, in which the HSO3^- acts as an acid by donating a proton to water, which acts as a base.
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17. HAZWOPER training and certification recognizes:
a. A large number (as much as 80%) will self-present or be self-referred victims
b. Awareness level training will promote proper initial triage actions
c.
Victims will use any entrance they can enter at the hospital, in addition to the
emergency department entrance
d. Both A and C
Answers
HAZWOPER training and certification recognize:
a large number (as much as 80%) will self-present or be self-referred victimsVictims will use any entrance they can enter at the hospital, in addition to the emergency department entranceThe correct option is both A and C
What is the HAZWOPER training and certification?HAZWOPER (Hazardous Waste Operations and Emergency Response) training and certification recognize that a large number of victims (as much as 80%) in hazardous waste incidents or emergencies will self-present or be self-referred for medical treatment.
Additionally, HAZWOPER training acknowledges that victims may use any entrance they can access at a hospital, not just the emergency department entrance.
This is because individuals affected by hazardous materials may arrive at different areas of the hospital seeking medical assistance.
Therefore, option d. Both A and C are correct statements regarding the recognition of HAZWOPER training and certification.
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Doraemon part of the water cycle heat from the Sun causes liquid to change into water vapor Which Resident to the atmosphere which statement best describes the reverse of this process
Answers
Answer:
it is most likely as a water cycle
1. Consider the following: HCl (aq) + NaOH (aq) → NaCl (aq) + H2O (liq) ∆H = -57.62 kJ/mol
If a 25.0 mL of 0.144 M HCl (aq) at 25oC is added to 20.0 mL of 0.132 M NaOH (aq) at 25oC, calculate the final temperature of the contents. Assume the volumes are additive and that the resulting salt water solution has a density of 1.04 g/mL with a specific heat capacity of 3.93 J/goC. Note that you will also need to determine the limiting reactant.
Answers
Answer:
25.82°C
Explanation:
Based on the reaction, 1 mole of HCl and 1 mole of NaOH reacts, that means the reaction is 1:1. The moles of each compound are:
Moles HCl:
0.025L * (0.144mol/L) = 0.0036 moles HCl
Moles NaOH:
0.020L * (0.132mol/L) = 0.00264 moles NaOH
Thus, moles of reaction are 0.00264 moles
The heat released in a calorimeter is obtained using the equation:
Q = m*c*ΔT
Where Q is heat released in the reaction:
0.00264 moles * (-57.62kJ/mol) = 0.1521kJ = 152.1J of reaction
m is mass of the solution:
25.0mL + 20.0mL = 45mL * (1.04g/mL) = 46.8g
c is specific heat of the solution:
3.93J/gºC
And ΔT is change in temperature.
Solving for ΔT:
Q /mc = ΔT
151.2J / 46.8g*3.93J°C = 0.82°C = ΔT = Final temperature - Initial temperature.
Final temperature = 0.82°C + 25°C =
25.82°C
explain why the solution changed color
Answers
Answer:
Most especially, solutions lose color when;
They are mixed with other solutions or elements.They are treated with chemical indicators such as phenolphthalein, and methyl orange.\({}\)
3- There are 8
basic elements of
life. True or false?
Answers
Answer: No that is false.
Explanation: There are 6 basic elements of life here they are. Have cells, have chemicals, respond to stimuli, reproduce, grow and develop, and use energy.
with reference to their rf values, rank the four amino acids in terms of their solubility in the solvent used
Answers
The four amino acids that are ranked in terms of their solubility in the solvent used, according to the Rf values, are Leucine, Arginine, Alanine, and Glycine.
What is Rf value?The retention factor (Rf value) is important in chromatography because it can be used to predict where a specific substance will be located on the chromatogram. This is due to the fact that the Rf value measures how far a specific substance has traveled relative to the solvent front.The presence of a high retention factor indicates a strong interaction between the compound of interest and the surface. This also implies that the compound of interest is highly soluble in the mobile phase.Moving molecules with a small Rf are less soluble in the hydrophobic (non-polar) solvent they are larger and also have a greater affinity towards the hydrophilic paper than molecules with a larger Rf.To learn more about Rf value refer to :
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What is the best way to measure the pH of a natural solution while out in a forest?
Answers
The best way to measure the pH of a natural solution while out in a forest is to use a portable pH meter or pH test strips specifically designed for field use. These instruments provide accurate and reliable pH measurements and are convenient for outdoor applications.
1. Prepare the necessary equipment: Before heading out to the forest, gather the required tools. You will need a portable pH meter or pH test strips, as well as the necessary reagents or calibration solutions if using a pH meter.
2. Collect the sample: Locate the natural solution you want to measure the pH of, such as a stream, pond, or soil. Use a clean container to collect a representative sample of the solution.
3. Calibrate the pH meter (if applicable): If you are using a portable pH meter, it is essential to calibrate it before taking measurements. Follow the manufacturer's instructions to calibrate the meter using the provided calibration solutions.
4. Conduct the measurement: For pH meters, immerse the electrode into the collected sample. Allow some time for the reading to stabilize, and then record the pH value indicated on the meter's display.
5. Using pH test strips: If you are using pH test strips, dip the strip into the collected sample for the recommended amount of time. Remove the strip and compare the color change with the provided color chart. Determine the corresponding pH value from the chart.
6. Repeat for accuracy: To ensure reliability, repeat the measurement process at least once and compare the results. This step helps confirm the accuracy of your measurements.
7. Record and analyze the data: Note down the pH values obtained and any relevant observations. Analyze the data as needed for your research or monitoring purposes.
By following these steps and using the appropriate equipment, you can effectively measure the pH of a natural solution while in a forest setting.
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The lewis dot notation for two atoms is shown. What is represented by this notation? K loses one portion to CI, K gains one portion from CI, K loses one electron to CI, K gains one electron from CI
Answers
Answer:
K loses one electron to CI
Explanation:
The lewis electron dot notation shows only the chemical symbol of the element surrounded by dots to represent the valence electrons.
We have atom of K with one valence electrons
Cl with 7 valence electrons
For an electrostatic attraction to occur, both particles must be charged. To do this, one of the species must lose an electron, and the other gains it.
This will make both species attain a stable octet;
Hence, K will lose 1 electron and Cl will gain the electrons.
Answer:
C: K loses one electron to CI
Explanation:
I took the test and got it correct!!
an ionic bond consist of a gas and metal
Answers
Answer: yes
Explanation:
What is the pH of a 0.045 M H2SO4 solution?
Answers
Answer:
pH = 1.05
Explanation:
A solution of sulfuric acid, H₂SO₄, dissociates in water as follows:
H₂SO₄ → 2H⁺ + SO₄²⁻
That means per mole of H₂SO₄ you will have 2 moles of H⁺
pH = -log [H⁺]
As [H₂SO₄] = 0.045M and [H⁺] = 2×[H₂SO₄]
[H⁺] = 0.090M
pH = -log [0.090M]
pH = 1.05The combustion of octane, C8H18, proceeds according to the reaction shown.
2C8H18(l)+25O2(g)⟶16CO2(g)+18H2O(l)
If 354 mol of octane combusts, what volume of carbon dioxide is produced at 15.0 ∘C
and 0.995 atm?
Answers
The concept ideal gas equation is used here to determine the volume of the carbondioxide. Combustion reactions are generally highly exothermic reactions. The volume of CO₂ is
A combustion is a chemical reaction in which a fuel undergoes oxidation as a result of the reaction with an oxidizing agent which causes the release of energy in the form of heat.
15.0 °C = 288 K
The ideal gas equation is:
PV = nRT
V = nRT / P
V = 354 × 0.0821 × 288 / 0.995 = 8412.3 L
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How many total hydrogen atoms are in CH3OOH?
Answers
Answer:
4
Explanation:
In CH3OOH, there is H3, which means 3 hydrogen atoms, but there is also an H at the end, which means another hydrogen atom.
3 + 1 = 4