Question 2 (1 point)
A group of friends is cooking an exotic stew in a house in South Florida. One of the
steps of the recipe is that they have to cool off the cooking mixture from 81.70 °C to
49.10 °C. The pot is too big to put it in a fridge for cooling down faster, the cooking
mixture weighted 34.6 kg. Fortunately, one of the friends remembered
thermochemistry and suggested that they put the pot in the small pool that is at the
house to cool it off faster. The pool was not heated and its temperature before
putting the pot with the stew was 19.24 °C. Given that the mass of water in the pool
was 4,825.6 kg, and the specific heat capacity of the pool is 4.30 J/(g°C) and that of
the cooking mixture is 4.20 J/(g°C), what is the final temperature of the pool after
the cooking mixture cooled down to the temperature needed by the recipe?
Your Answer:
Answer
units
Knowing that the system will attin a state of thermal equilibrium, the final temperature of the system is 19.24°C.
What is Thermochemistry?The term thermochemistry has to do with the heat evolved or absorbed in a chemical reaction.
Now we know that the heat gained by the pool is equal to the heat lost by the stew. Hence;
34.6 * 4.20 * ( 81.70 - T) = 4,825.6 * 4.30 * (T - 19.24)
11873 - 145.3T = 2075008T - 39923153.92
11873 + 39923153.9 = 2075008T + 145.3T
39935026.92 = 2075153.3T
T = 39935026.92/2075153.3
T = 19.24°C
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Which of the following is not a reason the nitrogen cycle is important to life on Earth?
a.
All living things need nitrogen to make proteins.
b.
Nitrogen is radioactive if it doesn’t go through the cycle.
c.
Organisms cannot use nitrogen directly.
d.
All living things need nitrogen to make DNA.
Answer:
b
Explanation:
A process that leads to the transformation of one set of chemical substances to another
A. Reactants
B. Chemical reaction
C. Law of conservation of mass
D. Products
Answer:
B . chemical. reaction
Explanation:
B chemical reaction
match the following
Answer:
1 FOSSIL FUEL WITH A2 COMBUSTION WITH D3 PETROL WITH C4 GOBAR GAS WITH E5 FIRE EXTINGUISHER WITH B
PLEASE MARK ME BRAINLIEST IF MY ANSWER IS CORRECT PLEASE
Oxidation number of nitrogen in Hydrazine (N2H4)
2.N + 4.H = 0
2N + 4.1 = 0
2N=-4
N=-2
Read the passage on the California Zero-Emission Vehicle Program. Should automobile makers be made to adhere to quotas of zero-emission vehicles set by states, even if it causes automakers to lose revenue?
Transport media is a significant pollution source by emitting gasses and particles. YES. Automobile makers should adhere to quotas for zero-emission vehicles.
What are the Zero-Emission vehicles?
These are cars, trucks, and buses that mostly run on electricity. The pollution degree caused by these vehicles is highly reduced compared with ordinary vehicles because of the reduction in fuel use and the consequent reduction in gasses and other substances emissions.
There are three types of zero-emission vehicles
Hybrids vehicles that combine gasoline and electricityFully electric vehicles that run entirely on electricityHydrogen cells vehicles that use hydrogen gas to produce electricity
Currently, and for decades, transport media are one of the most significant sources of gasses and other polluting substances emissions that lead to an increase in the greenhouse effect and global warming. Some of them are mentioned in the article -VOCs, nitrogen oxide, carbon monoxide, and dioxide, hydrocarbon-.
These are all primary pollutants suspended in the air that can produce secondary pollutants.
The mentioned pollutants could be significantly reduced by substituting transport media or improving the combustion processes. This last goal could be achieved by using alternative fuels and technologies or by using catalytic converters.
A considerable reduction in pollutant emissions from Zero-Emission Vehicles has already been proven in many countries. So several actions and regulations should be done about it to decrease even more -to near-zero- gasses and other particles emission. And more countries should be involved.
Following this thinking line, the answer is YES. Automobile makers should adhere to quotas of zero-emission vehicles set by states, even if it causes automakers to lose revenue.
You can elarn more about zero-Emission Vehicles at
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When 8.45 g of propane burns at STP, what volume of carbon dioxide is produced?
C3H8+ 5O2 > 4H2O+ 3CO2
The answer is 12.9L (I NEED THE STEPS)
The volume of carbon dioxide produced if 8.45 g of propane is burned would be 12.9 L
Stoichiometric calculationFrom the equation of the burning:
[tex]C_3H_8+ 5O_2 -- > 4H_2O+ 3CO_2[/tex]
The mole ratio of propane burned to carbon dioxide produced is 1:3.
Mole of 8.45 g propane = 8.45/44.1 = 0.19 moles
Equivalent mole of carbon dioxide produced = 0.19 x 3 = 0.57 moles
1 mole of any gas at STP = 22.4 L
0.57 moles of carbon dioxide at STP = 22.4 x 0.57 = 12.9 L
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possible cause of water hammering?
Answer:
At home, a water hammer may occur when a dishwasher, washing machine or toilet shuts off water flow. The result may be heard as a loud bang or repetitive banging since the shock wave travels back and forth in the plumbing system.
6.
Which of the following is NOT an example of a chemical change?
A. burning wood
B. the production of simple sugars through photosynthesis
C. fermentation of sugars into alcohol
D. grinding wood into sawdust
Answer:
D
Explanation:
the measured mass of a sample would have which units
Answer:
[tex]\longmapsto \: \frak[ hello \: mate ][/tex]
The measured mass of a sample would have unit as "Kilogram "
A certain orbital has four nodes in total. Which of the following could it be?
-5s
-5p
-5d
-5f
-all
Answer:
5p
Explanation:
We know
Number of Nodes =n-l
i)5s
n=5
l=0
Number of nodes=5-0=5
ii)5p
n=5
l=1
Number of nodes=5-1=4
Hence correct option is option b 5P
Atomic orbitals are the property that explains the position of the electron. 5p orbital has four nodes in total. Thus, option B is correct.
What are nodes?Nodes are the point in the orbit where the electron density is zero and is given by n-1.
In 5s the n = 5, l = 0 so, number of nodes = 5. In 5p, n = 5, l = 1, so nodes = 4. In 5d, n = 5, l = 2, so nodes = 3, and in 5f, n = 5, l = 3 so, nodes = 2.
Therefore, option b. 5p has four orbital nodes.
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How are potential and kinetic energy different?
Potential energy is stored in a battery, and kinetic energy is released thermal energy that causes electricity.
Potential energy is stored in an object, and kinetic energy is released mechanical energy that causes motion.
Kinetic energy is the movement of an object, and potential energy is released electrical energy when an object moves.
Kinetic energy is stored in an object, and potential energy is released mechanical energy that causes motion.
Answer:
b) potential energy is stored in an object, and kinetic energy is released mechanical energy that causes motion.
Explanation:
potential energy is stored because it is the possible energy of an object if a force is acted upon it. on the other hand, kinetic energy is essentially when potential energy is being acted upon or changed.
Answer: The second option
Explanation: For example, if a ball is sitting at the top of a hill, it has a lot of potential energy. If it then falls off, potential energy will turn into kinetic energy and the ball will roll down the hill.
Is glycosphingolipid and Sphingomyelin same?
Answer:
Yes, they are same
Explanation:
Glycosphingolipids are a subtype of glycolipids containing the amino alcohol sphingosine. They may be considered as sphingolipids with an attached carbohydrate. Glycosphingolipids are a group of lipids (more specifically, sphingolipids) and are a part of the cell membrane.
Answer:
glycosphingolipid is an example of sphingomyelin
........................
Answer:
no questions
it's just all dots here
Man is circled here in blue in the Quaternary Period. Locate it. Compare the location of man to the entire history of the world (the beginning of the spiral at the bottom left). What do you notice about the amount of water vs the amount of land as you spiral upward? Why do you think that is? What do you notice about the complexity of life as you spiral upward? Why do you think that is?
Answer:The upward spiral theory of lifestyle change explains how positive affect can facilitate long-term adherence to positive health behaviors. The inner loop of this spiral model identifies nonconscious motives as a central mechanism of behavioral maintenance.
Explanation://
Scenario A: 100 g of glucose in the presence of unlimited oxygen is metabolized through aerobic respiration.
Scenario B: 100 g of glucose in the absence of oxygen is metabolized through anaerobic respiration.
Would the mass of products produced in Scenario A be greater than, less than, or equal to the mass of products produced in Scenario B? Justify your answer.
A 100g piece of iron at 150oC is emersed in 268.5 g of water at 20oC. the temperature of both iron and water became 25oC. If the specific heat of iron is 0.449 J/g.K, find the specific heat of water?
Answer:
cW = 4.2J/g.k
Explanation:
Heat gained = Heat lost
iron(mc∆€) = water(mc∆€)
mi= 100g
ci = 0.449
∆€i= 150-25 = 125
...
mw= 268.5g
cw = ?
∆€w=25-20 = 5
...
100×0.449×125= 268.5×cw×5
5612.5= 1342.5cw
cw = 5612.5/1342.5
cw= 4.18 ~ 4.2J/g.K
the carbon atom which becomes asymmetric when the straight chain form of monosaccharide change into ring form is known as____\
Answer:
CARBOHYDRATES AND CARBOHYDRATE METABOLISM
Which reaction represents a nuclear reaction?
CO2+H2O→H2CO3
2Na+Cl2→2NaCl
92238U→90234Th+24He2+
2H2O2→2H2+O2
92238U→90234Th+24He2 is a Niclear reaction
Nuclear reaction involves Nuclear elements.
It is usually defined as spontaneous emission of electrons.
Uranium 238 is a nuclear element
The reaction that represents a nuclear reaction is : ( C ) 92238U→90234Th+24He2+
What is a nuclear reaction?A nuclear reaction is a process whereby two nuclei collide to form one or more nuclides. There are 4 different types of nuclear reaction and they are ;
FissionFusionNuclear decayTransmutationUranium 238 is a nuclear element therefore the reaction involving Uranium 238 is a nuclear reaction.
Hence we can conclude that The reaction that represents a nuclear reaction is : ( C ) 92238U→90234Th+24He2+
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The table compares some characteristics of two atoms.
Charged Particles
Atom Number of Neutrons Mass Number
х
6
12
Y
7
13
Use the table to determine the number of protons for each atom. Then, choose the statement below that is true about the two atoms.
The number of protons in X would be 6 while that of Y would also be 6. Thus, the two atoms would be isotopes of the same element.
Atomic properties of atomsThe mass number of an atom is the sum of protons and neutrons present in the atom.
For X with mass number 12 and neutron number 6, the number of protons would be:
12 - 6 = 6 protons
For Y with mass number 13 and neutron number 7, the number of protons would be:
13 - 7 = 6 protons.
Thus, both atoms have the same number of protons, meaning that they are likely isotopes of the same element.
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If you did not neutralize the saturated citric acid before you poured it down the drain, describe the potential consequences to the plumbing and the environment.
The plumbing will be corroded and could lower the pH of natural water bodies
What is acidic waste water?The term acidic waste water means water that has a low pH due to the presence of an acidic substance inside the waste water. As we know, citric acid has a low pH.
If this acid is disposed without proper neutralization, the plumbing will be corroded due to the fact that the acid will react with the plumbing material.
Also, this acidc waste could lower the pH of natural water bodies when it gets into natural water bodies.
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Which of the following conditions would lead to a small population size? a. a low birth to death ratio b. a high birth to death ratio c. immigration d. large number of resources Please select the best answer from the choices provided A B C D Mark this and return
Answer:
Choice A.
A low birth to death ratio
Explanation:
A low birth to death ratio means that people are dying faster than they are being born. This leads to a decreasing population size.
Answer:
It's A
Explanation:
What is the formula for calculating pH?
O A. pOH= [H*]
————
[OH -]
B. pH = -log[OH-]
C. pH = -log[H+]
D. pH = log[ht]
Answer:
c. pH=-log[H+]
Explanation:
pH=-log10[H+]
Balance the following equation. Fill in the blanks
( ? )NaCl + ( ? ) AgNO3 → ( ? )AgCl + ( ? ) NaNO3
NaCl+AgNO_3-->AgCl+NaNO_3
on both sides
Na=1Ag=1Cl=1NO_3=1Hence it's balanced already
Which is the correct step(s) for this reaction mechanism?
O NO2 + CO2 + CO NO + CO2
O step 1: NO2 + NO2 → NO + NO3 (slow)
step 2: NO3 + CO → NO2 + CO2 (fast)
O step 1: NO + NO3-NO + NO3 (slow)
step 2: NO3 + CO → NO + CO2 (fast)
O step 1: 2N02 + NO 2NO + NO3 (slow)
step 2: NO3 + CO → 2NO2 + CO2 (fast)
The reaction mechanims shows the sequence of steps through which a reaction occurs. The reaction mechanism for this reaction is;
step 1: NO2 + NO2 → NO + NO3 (slow)
step 2: NO3 + CO → NO2 + CO2 (fast)
What is reaction mechanism?We have to note that not all reactions occur in a single reactive encounter. If a reaction occurs in a single reactive encounter then it is called an elementary reaction.
The reaction mechanim shows the reaction sequence of a non elementary reaction. The correct mechanims of this reaction is shown as;
step 1: NO2 + NO2 → NO + NO3 (slow)
step 2: NO3 + CO → NO2 + CO2 (fast)
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What is required in addition to oxygen to create a high
temperature flame?
Answer:
Oxygen enrichment of combustion air to increase flame temperatures by reducing the proportion of nitrogen used in the combustion process is of particular value to operators of high-temperature furnaces.
How can you tell that Mercury is not a gas giant?
A.
because it is dense and rocky
B.
because of where it orbits the sun
C.
because it has only one moon
D.
because it has no ring system
Answer:
The answer to this question is A.
hope it helps :)
Many aerosol cans have warning labels on the side
that say to keep away from heat and fire. Why?
Answer:
Aerosol cans are pressurized, High temperatures increase the pressure in an aerosol can, potentially to the point of explosion.
what is the net ionic equation for the reaction that occurs when magnesium carbonate (s) and excess hydroiodic acid are combined
Answer:
2H+(aq) + 2Br-(aq) + Mg2+(aq) + S2–(aq) = Mg2+(aq) + 2Br-(aq) + H+(aq) + HS-(aq)
If 32.00 mL of a solution of Ca(OH)2 requires 16.08 mL of a 2.303 M solution of HNO2 for complete titration, what is the molarity of the Ca(OH)2 solution?
For the equilibrium that exists in an aqueous solution of nitrous acid ... calcium hydroxide is dissolved in water until the pH of the solution is 11.44.