What is the final mass of charcoal?
Answers
Related Questions
proposed
multiplication or division
Is this
possible?
result
р
x10
18. kg
= ?
yes
2
2.0 m
no
х
o yes
(1.1 cm) (0.30 m) =
= ?
O no
yes
(5.0 mL). (5.0 mL) = ?
no
Answers
Answer:
so sorry .....but it's not clear to me
which of these is used to treat epilepsy due to its ability to slow down neural activity in the central nervous system?
Answers
(C) Benzodiazepines is used to treat epilepsy due to its ability to slow down neural activity in the central nervous system.
Benzodiazepines are commonly used to treat epilepsy due to their ability to slow down neural activity in the central nervous system. These medications enhance the effects of gamma-aminobutyric acid (GABA), which is an inhibitory neurotransmitter that helps reduce excessive electrical activity in the brain.
By increasing the inhibitory effects of GABA, benzodiazepines can help control seizures and reduce the frequency and intensity of epileptic episodes. Examples of benzodiazepines used for epilepsy treatment include diazepam, lorazepam, and clonazepam.
The correct option is (C) Benzodiazepines.
""
which of these is used to treat epilepsy due to its ability to slow down neural activity in the central nervous system?
A) Antidepressants
B) Antihistamines
C) Benzodiazepines
D) Anticonvulsants
""
You can learn more about epilepsy at
https://brainly.com/question/28131457
#SPJ11
The ability of materials to act as conductors and insulators is relative. All materials, even those that are commonly classified as insulators, still allow some conduction of heat. For example, ceramic is a better conductor than Styrofoam. A ceramic mug filled with hot water feels warmer in your hand than a Styrofoam cup filled with hot water. However, ceramic is a worse conductor than metal. A metal mug filled with hot water would feel even hotter than the ceramic mug.
Which of the following accurately represents the relationship between ceramic and metal?
A
Metal and ceramic are equally effective conductors.
B
Metal is a better conductor than ceramic.
C
Metal is a better insulator than ceramic.
D
Metal does not conduct heat.
Answers
B. Metal is a better conductor then cramic
nice to help you-!
7. What is one of the BEST actions the US government can take to slow global warming?
-provide tax credits to those who carpool
-encourage people to buy electronic books versus paperbacks or hardbacks
-produce commercials that urge people to recycle
-invest in clean technologies such as wind and solar power
Answers
one of the BEST actions the US government can take to slow global warming is invest in clean technologies such as wind and solar power
What is the US government doing about global warming?EPA works with industry and others to reduce greenhouse gas emissions through regulatory initiatives and partnership programs. Within the Agency, EPA implements a range of strategies to reduce its own greenhouse gas emissions, increase energy efficiency, and take other steps to reduce its carbon footprintReaching 100% carbon pollution-free electricity by 2035. Achieving a net-zero emissions economy by 2050. Delivering 40% of the benefits from federal investments in climate and clean energy to disadvantaged communitiesMobilizing a whole-of-government approach, the United States is scaling up action at home and abroad to put the world on a path to reach net-zero emissions by 2050 and to achieve the global goal on adaptation. Learn more about the United States at COP27 and the U.S. Center
To learn more about global warming refers to:
brainly.com/question/26402403
#SPJ1
An ion has 26 protons, 28 neutrons, and 24 electrons. Which element is this ion? a. Xe b. Ni c. Fe d. Mg e. Cr
Answers
The ion that has 26 protons, 28 neutrons, and 24 electrons is Iron (Fe) (option c).
An element can be determined by the number of protons in the nucleus of its atom. The number of protons present in an atom is referred to as the atomic number of the element.
This means that the number of protons in an atom is unique to a specific element.
Iron (Fe) has 26 protons in the nucleus of its atom.
Therefore, an ion with 26 protons is an ion of the element iron (Fe).
Magnesium (Mg) has 12 protons, Chromium (Cr) has 24 protons, Xenon (Xe) has 54 protons and Nickel (Ni) has 28 protons.
Thus, an ion which has 26 protons, 28 neutrons, and 24 electrons is Fe (option c)
To learn more about proton:
https://brainly.com/question/1481324
#SPJ11
A pharmaceutical company claims that its new drug reduces systolic blood pressure. The systolic blood pressure (in millimeters of mercury) for nine patients before taking the new drug and 22 hours after taking the drug are shown in the table below. Is there enough evidence to support the company's claim?
Let d=(blood pressure before taking new drug)−(blood pressure after taking new drug)d=(blood pressure before taking new drug)−(blood pressure after taking new drug). Use a significance level of α=0.05α=0.05 for the test. Assume that the systolic blood pressure levels are normally distributed for the population of patients both before and after taking the new drug.
Patient 1 2 3 4 5 6 7 8 9
Blood pressure (before) 156156 155155 167167 176176 191191 160160 159159 197197 181181
Blood pressure (after) 146146 144144 154154 161161 165165 146146 148148 171171 155155
Copy Data
Step 3 of 5 :
Compute the value of the test statistic. Round your answer to three decimal places.
decision rule needed & reject or fail to reject
Answers
To support the pharmaceutical company's claim there is enough evidence. 8.48 is the value of the test statistic.
To test whether there is enough evidence to support the pharmaceutical company's claim that the new drug reduces systolic blood pressure, we can perform a paired t-test on the data.
d = (blood pressure before taking new drug) - (blood pressure after taking new drug)
The differences for the nine patients are as follows:
d = 156 - 146
= 10
d = 155 - 144
= 11
d = 167 - 154
= 13
d = 176 - 161
= 15
d = 191 - 165
= 26
d = 160 - 146
= 14
d = 159 - 148
= 11
d = 197 - 171
= 26
d = 181 - 155
= 26
Test statistic =
t = (mean(d) - hypothesized mean) / (standard deviation(d) / sqrt(n)
mean(d) = (10 + 11 + 13 + 15 + 26 + 14 + 11 + 26 + 26) / 9
= 16.89.
standard deviation(d) = sqrt([ (10-16.89)² + (11-16.89)² + (13-16.89)² + (15-16.89)² + (26-16.89)² + (14-16.89)² + (11-16.89)² + (26-16.89)² + (26-16.89)² ] / (9-1))
standard deviation(d) = 6.54.
t = (16.89 - 0) / (6.54 / sqrt(9))
t = 8.48.
Now, we need to determine whether the test statistic falls within the critical region or not. We will use a significance level of α = 0.05 for the test.
Since we have a two-tailed test, we need to compare the absolute value of the test statistic with the critical value from the t-distribution with (n-1) degrees of freedom. Here, freedom degrees is 8.
Using a t-table or statistical software, the critical value for a two-tailed test with α = 0.05 and 8 degrees of freedom is approximately 2.306.
|t| > 2.306
|8.48| > 2.306
8.48 > 2.306
Learn more about blood pressure -
brainly.com/question/31288008
#SPJ11
What is the difference in the atomic models of J.J Thomson and Rutherford??
Answers
Answer:
Rutherford proved J.J is wrong.
Explanation:
The Plum Pudding Model which was put forth by J.J Thompson stated that atoms are tiny particles of positively charged particles, with tiny negative charged particles stuck inside.
When Rutherford did the goldfoil experiment, he concluded that electrons (the negatively charged particles) actually revolve around the nucleas.
what's the nucleas?
So this too, was put forth by Rutherford that there is a centre of positive charges in an atom called nucleas it consists of protons and neutrons
hence, Rutherford proved that Plum Pudding Model was wrong.
hope I helped you :)
Stacy made the following table to compare the functions of plant and animal structures, but she is missing a row title. Which of the following would best replace the X?
a table comparing the functions of different animal and plant structures. There is an unknown 'X' in the table. The skeleton in animals and the stem in plants provide support. The fur in animals and the waxy covering in plants provide protection. The ovaries in animals and the pistil in plants make 'X'
Answers
Answer:
female reproductive structures
These two questions are related, I did not understand their answers
Answers
Answer:
42. The statement is "The value of ΔH° for the overall reaction is large and negative".
43. The value of the enthalpy change is -93kJ.
Explanation:
42. The Kp depends on the ΔH° as both are related by ΔG formula, so the statement that identifies the reason of Kp value is "The value of ΔH° for the overall reaction is large and negative".
If ΔH° is negative, then the calculation of Kp will be a large number, because the formula of Kp is:
\(K_p=e^{-\Delta G*(T)/RT}\)43. To calculate the value of the enthalpy change per mole of HCl produced, it is necessary to write the whole final reaction from the reactions in steps 1, 2 and 3 (multiplying or dividing the enrgies, just like the equations). Then, we have to sum all the final energies:
\(\begin{gathered} Step\text{ 1: }Cl_2\rightarrow2Cl\text{ }\Delta H°=242\text{ kJ/mol}_{rxn} \\ Step\text{ 2: }H_2+Cl\rightarrow HCl+H\text{ }\Delta H°=4\text{ kJ}/\text{mol}_{rxn} \\ Step\text{ 3: }H+Cl\rightarrow HCl\text{ }\Delta H°=-432\text{ kJ/mol}_{rxn} \\ Final:\text{ H}_2+Cl_2\rightarrow2HCl \end{gathered}\)In this case, it is not necessary to multiply or divide the equations, because each H cancels, and each Cl cancels as well.
\(242\text{ kJ/mol + 4kJ/mol - 432 kJ/mol =-186kJ/mol}\)-186 kJ is the enthalpy change for the whole reaction, where 2 moles of HCl are produced. So, to calculate the enthalpy change for 1 mole of HCl, we have to divide it by 2.
Finally, the value of the enthalpy change is -93kJ.
Which of the following reactions would have a decrease in entropy?
A. 2H20(g) → 2H2(g) + O2(9)
B. 2503(9) ► 2502(g) + O2(g)
C. 2NH3(9) ► N2(g) + 3H2(9)
D. 2NO2(g) → N204(9)
Answers
Answer:
D. 2NO2(g) → N204(9)
Explanation:
A p e x
2NO\(_2\)(g) → N\(_2\)O\(_4\)(g) reactions would have a decrease in entropy. Therefore, the correct option is option D.
What is entropy?Entropy is a measureable physical characteristic and a scientific notion that is frequently connected to a condition of disorder, unpredictability, or uncertainty. From classical thermodynamic, where it was originally recognized, towards the microscopic explanation of nature within statistical physics, the name and concept are employed in a variety of disciplines.
It has numerous applications in physics and chemistry, biological systems and how they relate to life, cosmology, economics, society, weather science, and information systems, especially the exchange of information. 2NO\(_2\)(g) → N\(_2\)O\(_4\)(g) reactions would have a decrease in entropy.
Therefore, the correct option is option D.
To know more about entropy, here:
https://brainly.com/question/14131507
#SPJ7
Complete the following statement: In Charles's law, the volume of a gas ____ when the ____ decreases (A) increases, temperature (B) increases, quantity of gas (C) increases, pressure (D) decreases, temperature (E) decreases, pressure
Answers
(D) decreases, temperature
Explanation:Ideal gas laws allow us to make assumptions about how gases will react under certain conditions.
Charles' Law
Charles' law relates a gas' volume with its temperature. The law states that changes in volume and temperature are directly proportional. This means that as one increases, so does the other, and vice versa. Mathematically, this law is represented as:
\(\displaystyle \frac{V_{1} }{T_{1} }=\frac{V_{2} }{T_{2} }\)Other Ideal Gas Laws
There are 4 other ideal gas laws: Boyle's, Gay-Lussac's, and Avagadro's. When all of these laws are combined, we are left with the ideal gas equation:
PV = nRTWhere P is pressure, V is volume, n is moles of gas, R is a constant known as the gas constant, and T is temperature. This equation combines all of the laws and helps explains how gases act when placed in a specific condition. For example, the equation shows that if P increases, then V will decrease to maintain equality.
74g of Ca(OH)2 (74 g/mol) in 340 ml solution
Answers
Answer:
This question is asking to calculate the molarity of the solution based on the information provided.
The answer is 2.94M
Explanation:
Molarity of Ca(OH)2 solution = number of moles (n) ÷ volume (V)
Using the formula below to calculate number of moles of Ca(OH)2.
mole = mass/molar mass
Molar mass of Ca(OH)2 = 74 g/mol
mole = 74g/74g/mol
mole = 1mol
Volume of Ca(OH)2 solution = 340ml = 340/1000 = 0.340 L
Molarity = 1/0.340
Molarity = 2.94M
How is the molar mass of an element different from the atomic mass of an element?
Answers
2.Molar mass is measured in grams per mole while atomic mass is “unitless.”
3.Atomic mass is measured via mass spectrometry while molar mass is computed via atomic weight.
Which of the following elements has the lowest electronegativity?
A. Barium
B. Magnesium
C. Strontium
D. Calcium
Answers
Answer:
A. Barium
Explanation:
hope this helps! :)
The first scale of electronegativity was developed by Linus Pauling and on his scale barium has a value of 0.89 on a scale running from from about 0.7 (an estimate for francium) to 2.20 (for hydrogen) to 3.98 (fluorine).
whats the balance to Sr + O, SrO
Answers
Answer:
SrO = Sr + O - Chemical Equation Balancer.
Explanation:
A 35.41 g piece of copper at 97°C was placed in a sample of water at 21.65°C. The temperature of the water increased to 22.87°C. What mass of water was the copper added to?
Answers
Answer:
197.98g
Explanation:
This question can be calculated using the formula: Q = mcΔT
Where Q= heat transfer
M= mass
C= specific capacity
ΔT= change in temperature
Heat from the copper metal is lost to the water when placed in it, hence, we have:
Q(water) = -Q(copper)
The final temperature of the water is equally to the final temperature of the copper= 22.87°C.
Hence, mcΔT (water) = (-) mcΔT (copper)
Note that, specific heat (C) of water and copper are 4.184 J/g°C and 0.385 J/g°C respectively.
Therefore;
= (m) (4.184) (22.87-21.65) = - {(35.41) (0.385) (22.87-97)}
= m × 4.184 × 1.22 = - {35.41 × 0.385 × -74.13)}
5.10448m = - {-1010.6031}
5.10448m = 1010.6031
m = 1010.6031 ÷ 5.10448
m = 197.98
Therefore, the mass of water copper was added to is 197.98g
During an endothermic reaction, heat is
Answers
Answer:
Absorbed during the above reaction.
Explanation:
It is lowering the temperature of the reaction mixture, and thus the reaction flask feels cold.
Answer:
Endothermic reaction: absorbs heat from its surroundings.
Explanation:
"Endo" means inside. "Thermic" refers to heat.
Spooky, scary skeletons
Send shivers down your spine
Shrieking skulls will shock your soul
Seal your doom tonight
Spooky, scary skeletons
Speak with such a screech
You'll shake and shudder in surprise
When you hear these zombies shriek
We're sorry skeletons, you're so misunderstood
You only want to socialize, but I don't think we should
'Cause spooky, scary skeletons
Shout startling, shrilly screams
They'll sneak from their sarcophagus
And just won't leave you be
Answers
Answer:
I LOVE THIS OMG
which three human body systems coordinate to cause the arm to move
Answers
Answer:
Nervous system, Cardiac system, and the muscluar system
Explanation:
assume that heat in the amount of 100 kj is transferred from a cold reservoir at 600 k to a hot reservoir at 1250 k contrary to the clausius statement of the second law. what is the total entropy change?
Answers
total entropy change:
S total = S hot + S cold = 0.0615kJ/k
which is violation of Clausius inequality of increase of entropy principle S total >= 0
What is entropy ?
Entropy is the measurement of the amount of thermal energy per unit of temperature in a system that cannot be used for productive work. Entropy is a measure of a system's molecular disorder or unpredictability since work is produced by organized molecular motion. Entropy theory offers profound understanding of the direction of spontaneous change for many commonplace events.
Entropy is a concept that gives mathematics a way to express the intuitive understanding of which operations are impossibly impossible even though they wouldn't go against the fundamental tenet of energy conservation.
T cold = 600k
T hot = 950k
Q=100kj
Shot=-Q/T hot = -0.1052kJ/k
S cold=Q/Tcold = 0.1667kJ/k
total entropy change:
S total = Shot + S cold = 0.0615kJ/k
which is violation of Clausius inequality of increase of entropy principle S total>=0
To know more about entropy from the link
https://brainly.com/question/6364271
#SPJ4
Shiny materials absorb radiant energy.
True
False
Answers
Answer:
False
Explanation:
Shiny materials reflect radiant energy.
& it was on quizlet :)
Please help! At a pressure of 200 atm, water’s melting point is approximately _____ (-2 C, 0 C, 10 C, or 370 C) and its boiling point is approximately ____ (370 C, 10 C, 0 C, -2 C)
Answers
At a pressure of 200 atm, water’s melting point is approximately 0⁰C and its boiling point is approximately 370⁰C.
What is melting point temperature?Melting point is the temperature at which a substance changes into liquid form.
From the chart, at a pressure of 200 atm, water’s melting point is approximately 0⁰C.
What is boiling point temperature?This is the temperature at which a liquid turns into a vapor. It is the temperature at which liquid and vapor co-exist.
From the chart, at a pressure of 200 atm, water’s boiling point is approximately 370⁰C.
Learn more about melting point here: https://brainly.com/question/25074953
#SPJ1
how many moles of CO2 are in 66.0g of CO2
Answers
Answer:; 66 g is about 3/2 the value of the molar mass of CO2. It is reasonable that the sample contains 3/2 (1.5) mol.
Explanation:
State the method used to separate;
1. Water from aqueous magnesium sulfate
2. Potassium chloride from aqueous potassium chloride
3. Silver chloride from a mixture of silver chloride and Water
4. Glucose from a mixture of Glucose and maltose
Options: filtration, diffusion, fractional distillation, crystallisation, chromatography. (each may be used once, multiple times or not at all)
Answers
The methods used to separate:
What is Separation in Chemistry?
In chemistry, separation refers to the process of separating the constituents of a mixture into distinct entities.
This can be accomplished by the use of several techniques such as filtering, crystallization, distillation, and chromatography, which are selected based on the qualities of the substances being separated and the required level of purity.
Separation is an essential feature of chemical analysis that is utilized in a variety of applications such as purifying substances, identifying and measuring the components of a mixture, and preparing samples for future investigation.
Learn more about Separation:
https://brainly.com/question/13619907
#SPJ1
in what major ways will the ir spectrum of cyclohex-4-ene-cis-1,2-dicarboxylic anhydride differ from the ir spectrum of cyclohex-4-ene-cis-1,2-dicarboxylic acid?
Answers
The IR spectrum of cyclohex-4-ene-cis-1,2-dicarboxylic anhydride will show a C=O stretching band in the range of 1810-1760 cm^-1, while the spectrum of the acid will show a broad O-H stretching band in the range of 3300-2500 cm^-1 and a C=O stretching band in the range of 1710-1680 cm^-1.
Hi! The major ways the IR spectrum of cyclohex-4-ene-cis-1,2-dicarboxylic anhydride will differ from the IR spectrum of cyclohex-4-ene-cis-1,2-dicarboxylic acid are as follows:
1. Anhydride functional group: In the anhydride, you will observe a characteristic absorption band in the range of 1810-1760 cm^-1 due to the C=O stretching vibrations of the anhydride functional group.
2. Carboxylic acid functional group: In the dicarboxylic acid, you will observe a broad absorption band in the range of 3300-2500 cm^-1 due to the O-H stretching vibrations of the carboxylic acid functional group. Additionally, there will be a C=O stretching band in the range of 1710-1680 cm^-1.
These differences in absorption bands will help you distinguish between the IR spectra of cyclohex-4-ene-cis-1,2-dicarboxylic anhydride and cyclohex-4-ene-cis-1,2-dicarboxylic acid.
learn more about IR spectrum here:
https://brainly.com/question/31379317
#SPJ11
Question 22 Marks: 1 Methane in the presence of air is explosive at concentrations betweenChoose one answer. a. 5 and 15 percent b. 3 and 5 percent c. 20 and 25 percent d. 50 and 60 percent
Answers
Methane in the presence of air is explosive at concentrations between 5 and 15 percent. So the correct answer is a. 5 and 15 percent.
Methane is a flammable gas that can form explosive mixtures with air when its concentration falls within certain ranges. The Lower Explosive Limit (LEL) is the minimum concentration of methane in air below which it is too lean to burn, and the Upper Explosive Limit (UEL) is the maximum concentration of methane in air above which it is too rich to burn. The explosive range for methane is typically considered to be between 5 and 15 percent by volume in air. This means that if the concentration of methane in air falls within this range, there is a risk of an explosive atmosphere being formed. It is important to take appropriate precautions and follow safety guidelines when working with or around methane or any other flammable gas to prevent accidents and ensure safe operations.
To know more about Methane,
https://brainly.com/question/12645626
#SPJ11
In which of the following cases is the vapor pressure of ethanol greatest?
A. mole fraction of ethanol in water = 0.10
B. mole fraction of ethanol in water = 0.25
C. mole fraction of ethanol in water = 0.50
D. pure ethanol
Answers
Answer:
The answer Is c. mole fraction of ethanol in water=0.50
Explanation:
The common mode of action based on the principle of like-dissolves-like and the concept of solvent-solute interactions.
Answers
The common mode of action based on the principle of like-dissolves-like and the concept of solvent-solute interactions is called solvation.
What is meant by solvent-solute interactions?Solute-solvent interactions are described as the intermolecular attractions between a solute particle and a solvent particle.
So in the case that If the intermolecular attractions between solute particles are different compared to the intermolecular attractions between solvent particles it is unlikely dissolution will occur.
An example of Solute-solvent interactions is when you add salt to water the salt dissolves and distributes uniformly within the water. There is more water than salt. So then we know that water is the solvent.
Learn more about solvent. at:
https://brainly.com/question/25326161
#SPJ1
Cu2O + C->
Cu + CO2
Balance the above reaction by writing in the correct coefficient.
Answers
Answer:
2 Cu2O + C = 4 Cu + CO2
Explanation:
CU2O has 2 coefficient
C has 1 coefficient
Cu has 4 coefficient
CO2 has 1 coefficient
Balance Equation 2 Cu2O + C = 4 Cu + CO2
Answer:
2CU2O + C -----> 2Cu + CO2
Explanation:
2 is added in reactants to balance oxygen O on both sides and 2 before Cu is added in products to balance Cu on both sides.
Which of the following items has/have definite weight and volume but no definite shape? a) hair b) conditioners, solutions, and shampoos c) oxygen d) ice cube.
Answers
The item that has definite weight and volume but no definite shape is ice cube. (D)
While hair, conditioners, solutions, and shampoos may have definite weight and volume, they can also take on different shapes and forms. Oxygen, on the other hand, does not have a definite weight or volume since it is a gas.
An ice cube is a solid that has a fixed volume and weight, but its shape can change depending on its container or surrounding environment. It is a perfect example of a substance that has a definite weight and volume but no definite shape. As it melts, it changes from a solid to a liquid, taking on the shape of its container.
This is because the molecules in a solid are closely packed together and have a fixed shape, while in a liquid, they are more spread out and can flow.
To know more about molecules click on below link:
https://brainly.com/question/30465503#
#SPJ11