Answer:
D) 21.9
Explanation:
1 kilocalorie is equal to 4184 joules
0.001 kilocalorie is equal to 1 calorie
so 5.25 calorie=21.966 joules
Search blue bottle experiment, read over the reaction, and explain why the colorless solution turns blue
and how it then turns back to colorless. answer
Answer:
An alkaline solution of glucose acts as a reducing agent and reduces added methylene blue from a blue to a colourless form.
The typical capacity for human lungs is approximately 5800 mL. At a temperature of 37C (average body tempurature) and pressure of 0.98 atm, how many moles of air do we carry inside our lungs?
Answer:
0.22 moles of air we carry inside our lungs.
Explanation:
An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.
The gas laws are a set of chemical and physical laws that allow determining the behavior of gases in a closed system. The parameters evaluated in these laws are pressure, volume, temperature and moles.
The ideal gas law is an equation that relates the variables pressure P, temperature T and volume V if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases as follows:
P * V = n * R * T
In this case:
P= 0.98 atmV= 5800 mL= 5.8 L (being 1,000 mL= 1 L)n= ?R= 0.082 [tex]\frac{atm*L}{mol*K}[/tex]T= 37 C= 310 K (being 0 C= 273 K)Replacing:
0.98 atm* 5.8 L= n* 0.082 [tex]\frac{atm*L}{mol*K}[/tex] * 310 K
Solving:
[tex]n=\frac{0.98 atm* 5.8 L}{0.082 \frac{atm*L}{mol*K} *310 K}[/tex]
n= 0.22 moles
0.22 moles of air we carry inside our lungs.
Frank drank 2 liters of soda. How many mL of soda did he drink?
Answer:
2000 mL
Explanation:
1 L = 1000 mL
Therefore,
2 L = 2 x 1000 mL = 2000 mL
The least abundant gas in the air is
a. Xenon, Xe
b. Oxygen, O2
c. Water, H2O
d. Nitrogen, N2
Answer:
A.
Explanation:
Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Xenon(Xe ) is the least abundant element on the earth. The correct option is option A.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.
Oxygen, water, and nitrogen are the most abundant molecule on the earth. Xenon is the least abundant amongst all given option. Xenon belongs to noble gas family. So, Xenon is not reactive at all. Xenon does not form any compound with any other element so its abundance on earth is very less.
Therefore, Xenon(Xe ) is the least abundant element on the earth. The correct option is option A.
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Where is altitude measured in meters? How did this affect the MD-11?
Answer:
China, Mongolia, Russia, and North Korea. They were told to fly at 1400 meters but they flew at 1500 feet making them crash.
Explanation:
The accepted value for the molar volume of a gas is 22.4 L. Sarah’s experimental data indicated that a mole of a gas had a volume of 19.6L. What was her percent error?
Answer:
12.5%.
Explanation:
The following data were obtained from the question:
Accepted value = 22.4 L
Experimental value = 19.6L
Percentage error =.?
Percentage error can be obtained by using the following formula:
Percentage error = |Experimental value – Actual value | / actual value × 100
Percentage error = |19.6 – 22.4|/22.4 × 100
Percentage error = 2.8 /22.4 × 100
Percentage error = 280/22.4
Percentage error = 12.5%
Therefore, the percentage error of Sarah is 12.5%
Why can't scientific method always be used to solve social, political, ethical, and economic problems?
Answer:
In fact, science helps a lot for social, political, ethical, and economic problems. Your question is just to deny that science is not helping your life and you have no evidence to support what you say.
Explanation:
What structures are present in a animal cell but not in a plant cell?
Animal cells each have a centrosome and lysosomes, whereas plant cells do not. Plant cells have a cell wall, chloroplasts and other specialized plastids, and a large central vacuole, whereas animal cells do not.
Which of these describes a natural phenomenon or relationship that always occurs under specific conditions a) theory b) law Group of answer choices
Answer:
B). Law
Explanation:
A law is defined as the statement of an observed order, sequence, or relationship of a natural phenomenon which is invariable or always true under certain specific conditions while the theory is characterized as the explanation of this observed phenomenon and prediction of the new facts or phenomenon which was previously not observed to set out the new laws or principles of something. Thus, the theory is the base for the formation of law and hence, option B is the correct answer.
Should your height be measured in meters or centimeters
Your height should be measured in meters. Centimeters is much too small of a unit to measure the several feet most people are.
What is a molecular orbital? Question 3 options: Another method of describing the orbitals of individual atoms A mixing of the atomic orbitals from an atom’s inner-most shell with those of the valence shell An area around a molecule that describes a region of space where the electrons that are shared between bonded atoms can reside A mixing of the atomic orbitals from an atom’s valence shell
Answer:
An area around a molecule that describes a region of space where the electrons that are shared between bonded atoms can reside
Explanation:
A molecular orbital is an area around a molecule that describes a region of space where the electrons that are shared between bonded atoms can reside.
Molecular orbitals are formed by linear combination of atomic orbitals of about the same energy. The number of atomic orbitals that are combined to give molecular orbitals is the same as the number of molecular orbitals formed. The build up of electrons in molecular orbitals also follow the Aufbau principle, Hund's rule and Pauli exclusion principle.
Select the foods below that make up the 8 most common allergens.
Select all that apply and then click Submit.
Milk
Apples
Soda Pop
Peanuts
Soy
Nuts
Eggs
Fish
Reset
Chicken
Shellfish
Wheat
Broccoli
Why was lake Lenore chosen
Answer:
Dude just watch the video
Explanation:
Define Chemotherapy
Explanation:
the treatment of disease by the use of chemical substances, especially the treatment of cancer by cytotoxic and other drugs.
which part of potato plant stores food?
Answer:
Explanation:
The answer is rooot ok
the food is prepared in the form of starch in potato and ginger plants the food is stored in the Ender Ground Park gender and potato or underground stems while potato is a tuber Ginger is a rhizome in the food is stored in them in the form of starch so it is prepared in the leaves.
Q: A wind-up toy that is not wound up...
(drag the check on one)
does not have energy.
has potential energy.
has kinetic energy
has both kinetic and potential energy
S
A wind-up toy that is not wound up will have Potential Energy Hence, The correct option is Option (B)
What is potential energy ?Potential energy is that the energy control by associate object due to its position relative to alternative objects, stresses among itself, its charge, or alternative factors.
The total energy of a mechanical toy is given as follows ;
Total Mechanical Energy = Kinetic Energy + Potential Energy
During the winding up of the coil, the total energy becomes the kinetic energy
The total energy at the point of winding up of the coil = The kinetic energy supplied to the toy by winding the coil
From the first law of thermodynamics, energy can not be created nor destroyed however may be modified from one type to a different
Due to the coil being prevented from unwinding, the kinetic energy stored as Potential energy of the toy
When the toy is operated it then unwinds the coil bringing about motion and converting back the potential energy to kinetic energy by itself as if it was alive.
Therefore, A wind-up toy that is not wound up will have Potential Energy Hence, The correct option is Option (B)
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A jeweler has five rings, each weighing g, made of an alloy of silver and gold. She decides to melt down the rings and add enough silver to reduce the gold content to . How much silver should she add
Complete question :
A jeweler has five rings, each weighing 18 g, made of an alloy of 10% silver and 90% gold. She decides to melt down the rings and add enough silver to reduce the gold content to 75%. How much silver should she add?
Answer:
Kindly check explanation
Explanation:
Given the following :
Weight of each alloy = 18g
Initial % of Silver = 10% = 0.1
Initial % of Gold = 90% = 0.9
New % of gold = 75% = 0.75
Hence, new % of silver will be (1 - 0.75) = 0.25
Let the amount of silver to be added = s
Hence,
Initial gold content = final gold content + added silver
18 * 0.9 = 0.75(18 + s)
16.2 = 13.5 + 0.75s
16. 2 = 13.5 + 0.75s
16.2 - 13.5 = 0.75s
2.7 = 0.75s
s = 2.7 / 0.75
s = 3.6
S = 3.6
Hence the amount of silver needed per ring in other to reduce the gold content = 3.6g
Total for the 5 rings = (3.6 * 5) = 18g
Which best explains how fiber-optic technology benefits the field of medicine?
O It allows doctors to view internal body structures to help them diagnose illnesses.
O It helps surgeons make more accurate repairs to broken blood vessels.
O It allows doctors to magnify cells so they can identify unhealthy cells that cause cancer.
O It helps surgeons make cuts that are smaller and less painful than traditional methods.
Answer:
A. It allows doctors to view internal body structures to help them diagnose illness.
Explanation:
The statement, that describes fiber-optic technology benefits the field of medicine is "it allows doctors to view internal body structures to help them diagnose illnesses."
What is fiber-optic technology?Fiber optics is a technology that transmits information as light pulses across great distances using strands of glass or plastic fibre. Fiber-optic cables use light pulses that travel quickly to convey data.
Internal organs and tissue can be viewed through bodily orifices because to the flexible yet hard multi-fibers. Endoscopes are used by doctors to explore symptoms such as nausea and gastrointestinal pain, confirm diagnosis through biopsies, and provide medical therapy.
Medical fibre optics are an important medical technology that is employed in a variety of medical professions. They are chemically inert, sterile, malleable, and non-toxic to the human body. Fiber optic technology enables surgeons to repair organs, diagnose joint problems, and remove sick tissues, resulting in a faster recovery period for the patient than more intrusive surgical approaches.
Hence the correct answer is it allows doctors to view internal body structures to help them diagnose illnesses.
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A true statement about mass is that
A. as the force of Earth's gravity on an object increases the object's mass increases.
B. mass is expressed in pounds
C. mass if often measured with a spring scale. D. mass is determined by comparing the mass of an object with a set of standard masses tha catalanse
Answer:
d
Explanation:
A: mass never increases or decreases. It is a value that is the same everywhere in the universe. A is not correct.
B: it can be but that is not the only unit that can be used
C: A spring scale measures force not mass.
D: The answer to this question is D if the word at the end is balance.
the valency of metal 'm' 1+. give the formula of its oxide
Answer:
[tex]M_{2}O[/tex]
Explanation:
Anything oxide is a compound with oxygen, and since oxygen is -2, it requires two of the metal's +1 to make it zero
In other words:
2(+1) + (-1) = 0
HELP BRAINLIESTTTT
What best describes the bonding in a water molecule? (1 point)
a
An oxygen atom shares an electron pair with each H atom.
b
An oxygen atom shares a single electron with each H atom.
c
An oxygen atom receives an electron from each H atom.
d
An oxygen atom transfers an electron to each H atom.
Answer:
l guess c is the answer
Explanation:
it is true because in oxygen does not share any atoms with hydrogen
Answer:
A
Explanation:
taking test currently
iron is a metal that rusts in the presence of oxygen and water. mild steel is used for ...1... and is prevented from rusting by ...2...chemistry igcse
Answer and Explanation:
Used as a construction frame material and for bending metal works because they are rigid and strong.Galvanising or coating the surface would prevent rusting.N.B.: Mild steel is steel that has low carbon content, also called carbon steel.
I hope this explanation was helpful.
Answer:
car bodiespaintingExplanation:
Mild steel is used in making car body parts because it is malleablePainting mild steel prevents moisture and oxygen from reaching the metalIn carbon dioxide (CO2), how many grams of oxygen (O) would there be if there are 24 grams of carbon (C)?
Answer:
64g of Oxygen
Explanation:
Firstly, carbon and oxygen react to form CO2 as follows;
C + O2 => CO2
According to the equation, one mole of C reacts with one mole of O2 to give one mole of CO2
Since molar mass of C= 12g/mol, O= 16g/mol
One mole of (C) contains 12g
One mole of O2 contains 16(2) = 32g
Hence, If there are 24g of C, there would be 24 × 32 / 12
= 768/12
= 64g
Hence, there would be 64g of oxygen if there are 24g of Carbon
Convert 3.48 Km into millimeters. The correct answer with correct units is:
A.)0.000000348M
B.)3. 4800 Mm
C.)3,480,000 mm
D.) 3, 480,000,000 mm
Answer:
C- 3480000mm
Explanation:
3480000mm
_________ is the mechanical separation of a mixture based upon the sizes of the mixtures components.
Answer:
Sieving
Explanation:
Sieving is a mechanical separation technique which depends on the relative sizes of particles in the mixture.
A mesh is used to discriminate between particle sizes. Particles in the mixture which are larger than the mesh size do not pass through the sieve, hence particles whose size is less than that of the mesh are separated from the rest of the particles in the mixture.
What is the answer to this question
Answer:
hypothesis
Explanation:
a hypothesis is a prediction that you make about an experiment.
An object with a negative acceleration could NEVER have a positive velocity. a. TRUE b. FALSE
Answer:false
Explanation:
In a chemical processing plant, a reaction chamber of fixed volume V0 is connected to a reservoir chamber of fixed volume 4V0 by a passage containing a thermally insulating porous plug. The plug permits the chambers to be at different temperatures. The plug allows gas to pass from either chamber to the other, ensuring that the pressure is the same in both. At one point in the processing, both chambers contain gas at a pressure of 1.00 atm and a temperature of 27.0°C. Intake and exhaust valves to the pair of chambers are closed. The reservoir is maintained at 27.0°C while the reaction chamber is heated to 400°C. What is the pressure in both chambers after that is done? 50. Why is the following situation impossible?
Answer:
Explanation:
The two chambers are at temperature of 27° and pressure of 1 atm . Now temperature of second chamber is increased to 400°C so its pressure will be increased but pressure of chamber whose temperature remains at 27°C will remain unaltered . Hence the pressure of chamber at 27°C will be at 1 atm.
The volume of second chamber is 4 V₀ , temperature changed from 27 + 273 = 300 k to 400 + 273 = 673 K , initial pressure was 1 atm . Let final pressure be P
From gas law formula
1 x 4 V₀ / 300 = P x 4 V₀ / 673
P = 1 x 673 / 300
= 2.24 atm .
The pressure of the chamber at 400°C will be 2.24 atm.
An object measures 6.2cm x 13.7cm x 26.9cm. Which value is the length of the object?
Answer:
Explanation:
The length is usually the longest side.
That would mean that 26.9 is the length.
15 x 10^2) + (5.2 x 10^5)
Explanation:
(15 × 10^2) =1500.
(5.2 ×10^5)=520000.
(1500)+(520000).
=518500 .