cm 5. Express the result of adding 856.6g and 23.86g to the correct number of significant figures.
Answer:
880.5
Explanation:
Express the result of adding 856.6g and 23.86g to the correct number of significant figures.
856.6 +23.86 = 856.6 + 23.9 = 880.5
The result of adding 856.6 g and 23.86 g after rounding off to correct significant figures is 856.6 + 23.9=880.5.
What are significant figures?Significant figures are used for establishment of a number which is presented in the form of digits. These digits give a meaningful representation to the numbers.
The significant figures are the significant digits which convey the meaning according to the accuracy. These provide precision to the numbers and hence are called as significant numbers.There are rules for counting significant figures which are as follows:
1)All non-zero digits are significant .
2)All zeroes which occur between non-zero digits are significant.
3)All zeroes to the left and right of a non-zero digit are not significant.
4) All zeroes on right of decimal are significant if a non-zero number follows them.
5)All zeroes on right side of non-zero digit are significant.
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QUESTION 27
20 points
Compare and contrast how the selection of police officers in 1840s New York differed from police officer selection under the European
model.
Explanation:
During the 1800s in England, relations police, which became composed of male volunteers, became organised to observe over the protection and protection in their relatives. As Britain's populace step by step expanded, so did the quantity of crimes tha…
During the 1800s in England, relations police, which became composed of male volunteers, became organised to observe the protection and protection of their relatives.
What is protection?Protection is any measure taken to guard a thing against damage.
During the 1800s in England, relations police, which became composed of male volunteers, became organised to observe the protection and protection in their relatives.
As Britain's populace step by step expanded, so did the number of crimes that had been committed. This intended that regulation and order additionally needed to improve.
The New York City Police Department (NYPD) originates withinside the Government of New York City and tries to manipulate growing crime in early to mid-nineteenth century New York City.
This expanded crime became because of an expanding populace, brought about usually through negative Irish immigrants starting withinside the 1820s.
Whereas, as societies have become greater heterogeneous and complex, the function of the police is turning greater demanding. To fulfil this function, law enforcement officials want numerous broadly acknowledged competencies and private qualities, however much less is thought approximately how they're valued through police recruits.
Thus, we've tested the perspectives of police recruits in six European nations on 3 skills or traits of regarded significance for police work: knowledge, leadership, and the cap potential to shape precise family members with residents.
We have additionally explored versions in perspectives of recruits in distinct businesses and modifications of their perspectives for the duration of their schooling. For those purposes, we used survey facts accumulated withinside the RECPOL project.
Since the facts had been accumulated from distinct populations and at distinct times, the evaluation is primarily based totally on dimension invariance methodology, and one of the objectives became to spotlight the significance of rigorous appraisal of the pleasant and comparison of comparable survey facts the use of such methods.
The consequences display each variation and similarities in perspectives of recruits withinside the surveyed nations and modifications for the duration of schooling.
Police lifestyle seems to be an extensive factor, as greater objects withinside the carried out device can be validly utilized in comparisons of recruits in businesses with comparable policy traditions.
The consequences additionally confirmed exciting contrasts, e.g. new recruits in Sweden rated precise family members with residents greater surprisingly than recruits in businesses with a greater army history, however, this sample was modified for the duration of schooling, probably because of the effects of the recruitment process, schooling and lifestyle in the businesses.
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What is the chemical composition of shale?
Answer:
30.8 percent quartz, 4.5 percent feldspar, 3.6 percent carbonate, <0.5 percent iron oxides, 60.9 percent clay minerals, 1 percent organic material, and 2 percent other materials.
Hydrogen fusion creates _____ and lots of energy.
Explanation:
Fusion processes require fuel and a confined environment with sufficient temperature, pressure, and confinement time to create a plasma in which fusion can occur. The combination of these figures that results in a power-producing system is known as the Lawson criterion. In stars, the most common fuel is hydrogen, and gravity provides extremely long confinement times that reach the conditions needed for fusion energy production. Proposed fusion reactors generally use hydrogen isotopes such as deuterium and tritium (and especially a mixture of the two), which react more easily than hydrogen to allow them to reach the Lawson criterion requirements with less extreme conditions. Most designs aim to heat their fuel to around 100 million degrees, which presents a major challenge in producing a successful design.
As a source of power, nuclear fusion is expected to have many advantages over fission. These include reduced radioactivity in operation and little high-level nuclear waste, ample fuel supplies, and increased safety. However, the necessary combination of temperature, pressure, and duration has proven to be difficult to produce in a practical and economical manner. Research into fusion reactors began in the 1940s, but to date, no design has produced more fusion power output than the electrical power input.[1] A second issue that affects common reactions is managing neutrons that are released during the reaction, which over time degrade many common materials used within the reaction chamber.
Fusion researchers have investigated various confinement concepts. The early emphasis was on three main systems: z-pinch, stellarator, and magnetic mirror. The current leading designs are the tokamak and inertial confinement (ICF) by laser. Both designs are under research at very large scales, most notably the ITER tokamak in
How much heat is required to increase the temperature of 150 g of water from
38°C -55°C?
Answer:
-55°C
Explanation:
Bwcause 38°C is gonna make it colder so thats why you should use that.
I am not feeling well
I hope you feel better soon! :)
Which of the following has kinetic energy?
O A compressed spring
O An arrow shot from a bow
O water in a reservoir at a hill top
O Amonkey hanging from a tree
Kinetic energy is energy that an object possesses due to its motion.
Lets look at each option:
A compressed spring has potential energy.
An arrow shot from a bow does have Kinetic energy.
Water in a reservoir at a hill top is potential energy.
A monkey hanging from a tree is potential energy.
This means that the answer is B) An arrow shot from a bow
I hope this helps! :)
According to law of conservation of energy,energy is converted from one form to another so by this fact an arrow shot from a bow has kinetic energy generated from potential energy.
What is law of conservation of energy?
According to law of conservation of energy, it is evident that energy is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.
Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Julius Robert Mayer in the year 1842.
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Predict the product of each monosaccharide oxidation reaction.
The complete oxidation of the monosaccharide shown will create a carboxylic acid.
Monosaccharides can be oxidized to carboxylic acids. Recall that monosaccharides have an aldehyde or ketone group at one end and a CH2OH group at the other end.
For the monosaccharide shown, oxidation may lead to the conversion of COH group to acid (-COOH). This confirms the presence of -COH yielding the product C4H8O5.
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Zingerone, one of the flavor molecules in ginger,
contains only C, H, and O. Combustion of 10.0 g
of zingerone produces 24.91 g of CO2 and
6.522 g of H20. Determine the molar mass of the
compound if it is between 150.0 and 220.0 g/
mol. Provide an answer to four significant
figures.
The molecular formula of the compound is C12H15O3 hence the molar mass of the compound is 207 g/mol.
We need to obtain the number of moles of carbon, hydrogen and oxygen in the compound;
Carbon = 24.91 g/44g/mol × 1 mole of carbon = 0.566 moles
Mass of carbon = 0.566 moles × 12 g/mol = 6.792 g
Number of moles of hydrogen = 6.522 g/18 g/mol × 2 moles = 0.725 moles
Mass of hydrogen = 0.725 moles × 1 g/mol = 0.725 g
Mass of oxygen = 10 - (6.792 g + 0.725 g) = 2.483 g
Number of moles of oxygen = 2.483 g/16 g/mol = 0.155 moles
Now we must divide through by the lowest number of moles;
C - 0.566/0.155 H - 0.725/0.155 O - 0.155/0.155
C - 4 H - 5 O - 1
The simplest formula is C4H5O Recall that the molar mass of the compound lies between 150.0 and 220.0 g/mol
4(12) + 5(1) + 16 = 69
Hence; n = 3 and the molecular formula of the compound is C12H15O3
The molar mass of the compound is; 12(12) + 15(1) + 3(16) = 207 g/mol
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ssignment (1) Nitrobenzene has a dipole moment of 4.2 x 10-9 esu cm while phenol has a value of only 1.7 x 10-8 esu cm. However, nitrobenzene is soluble only to the extent of 0.0155mole/kg in water while phenol is soluble to the extent of 0.95mole/kgat 20C. explain this phenomenon.
Phenol can form hydrogen bonds with water since it contains O-H group but nitrobenzene can not form hydrogen bonds with water.
Polar molecules tend to be soluble in water. The greater the dipole moment, the greater the polarity of the compound. We can see that Nitrobenzene has a dipole moment of 4.2 x 10-9 esu cm while phenol has a dipole moment of 1.7 x 10-8 esu cm.
Now, It is confusing to observe that the solubility of Nitrobenzene in water is far less than that of phenol despite its higher dipole moment. The reason for this observation is that, phenol can form hydrogen bonds with water since it contains O-H group but nitrobenzene can not form hydrogen bonds with water.
Therefore, phenol is more soluble in pure water as a solvent compared to nitorbenzene.
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Use the image to answer the question.
An illustration shows the process that takes place in a cold pack. The warm cold pack has ammonium nitrate on one side and water on the other. The water is kept separate in a thin plastic bag. The pack is squeezed and the inner bag bursts. The mixture cools as ammonium nitrate dissolves.
Which kind of reaction is shown in this image?
(1 point)
It is an endothermic reaction because the system takes energy from the surroundings.
It is an exothermic reaction because the surroundings take energy from the system.
It is an endothermic reaction because the surroundings take energy from the system.
It is an exothermic reaction because the system takes energy from the surroundings.
Answer:
it is an endothermic reaction because the system takes energy from the surrounding.
Answer:
It is an endothermic reaction because the system takes energy from the surroundings.
Explanation:
I did the test.
The primary role of coenzyme A in aerobic respiration is to
A. speed up the citric acid cycle.
B. transport electrons to FAD
C. kick off the transport electron cascade.
D. activate acetyl CoA and other molecules in the citric acid cycle.
Answer:
I could be wrong but i believe the answer is D. It was not B when i took the test
Explanation:
Photosynthesis is an endothermic chemical reaction that forms sugars from carbon
dioxide, water, and the sun's energy. Which of the following must be true of
photosynthesis?
The reaction can take place only if energy is added.
The reactants are oxidized.
The photosynthesis reaction produces ions.
The molecular bonds in carbon dioxide are very weak.
Answer:
The reaction can take place only if energy is added.
The Thermal Energy
The thermal energy of an object is the total kinetic energy of its particles. An object's
thermal energy depends on the mass of the object, its temperature, its state of matter,
and its chemical composition. Larger objects have more thermal energy than smaller
objects of the same material and density at the same temperature. A liquid substance
has more thermal energy than the same mass of the substance in its solid form.
9. Suppose you have two identical objects made of the same mass of the same material.
If one object is 20 °C warmer than the other, which object has more thermal energy?
Thermal Energy is directly proportional to the temperature
Or
[tex]\\ \sf\longmapsto Thermal\: Energy\propto Temperature [/tex]
So if temperature increases the thermal Energy also increases.
An object which is 20°C warmer than other has more thermal energy
help me someone! giving brainliest
Answer:
last or second
Explanation:
report me if not correct
Answer:
Should be the second one
Explanation:
In comments
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The table shows the boiling points of fluorine, chlorine and bromine.
Element
Boiling point in °C
Fluorine
-186
Chlorine
-34
Bromine
+59
(c) Explain why the boiling points in the table are low.
Explanation:
the chemicals are group 7 elements and one of their characteristics is that the melting and boiling point increase progressively
—————— —should be treated chemically before deposing it to rivers.
——Industrial waste——— should be treated chemically before deposing it to rivers.
=》The waste from factories & industries are highly acidic/base. This leads to the increase/decrease of the pH value of water in the rivers making it contaminated & unfit for drinking. This also causes a huge problem for aquatic organisms.
=》Industrial waste should be neutralized before depositing it into water bodies to reduce these risks.
_______
⚜ Hope it helps :))
Answer: Industrial waste
Explanation:
Which of the following subject areas contains questions that can be answered by science?
O Astronomy
O Alchemy
O Ethics
O Religion
Answer:
A
Explanation:
K took the test
Astronomy subject areas contains questions that can be answered by science. Thus option A is correct.
What is Astronomy?The science deals with extraterrestrial objects and phenomena, that is everything in our universe beyond the atmosphere of our planet.
This science is more observational than experimental. Astronomy can be up two types such as observational astronomy and theoretical astronomy.
Now a day, the field of astronomy has been expanded enormously in different field of subjects like astrometry, planetary astronomy, astrophysics, astrobiology, astrochemistry, etc.
The field of astrophysics is used understand the nature of celestial objects and their physical processes involve in the formation and emission of radiation.
Other research application include the chemical composition of stars, study of nuclear reactions to know the details about the the radiation energy release from stars.
Thus, Option A is correct.
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If aqueous solutions of Na2CO3 and BaCl2 are mixed, which insoluble precipitate is formed?
Answer:
barium chloride (BaCl2) is added to sodium carbonate (Na2CO3). The result is a white precipitate.
Explanation:
which has the shorter bond lengths in Alkane,alkene and alkynes
Answer:
alkanes
Alkynes have the strongest bond. Followed by alkenes and then alkanes. This is because in alkynes there are 3 bonds between at least two carbons
Hitting a ball with a baseball bat is an example of a force
True or False
What is velocity?
0000000
Answer:
Velocity is the speed in which the light is traveling
Explanation:
HELPP PLISS :(
Achemist analyzes two samples. One sample contains 14 g of element X and 6.0 g of element Y. The second sample contains 28 g of element X and 6.0 g of element Y. Does it appear that the two samples are the same substance? Explain the reasons for your answer.
A chemist analyzes two samples. One sample contains 14 g of element X and 6.0 g of element
What other inventions came because of the microscope? (These are inventions that are related to the microscope in some way.)
Answer:
Explanation:Leeuwenhoek observed animal and plant tissue, human sperm and blood cells, minerals, fossils, and many other things that had never been seen before on a microscopic scale. He presented his findings to the Royal Society in London, where Robert Hooke was also making remarkable discoveries with a microscope.
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Indicate the general type of reaction represented in each the reactions: The starting material is a 6 membered ring with an internal alkene between carbons 1 and 2. The product is a six membered ring with a bond to X on carbon 1 and a bond to Y on carbon 2. What type of reaction is Reaction A
The reaction as described is an addition reaction in which a saturated product is obtained.
The information we have from the question is that; the starting material is a 6 membered ring with an internal alkene between carbons 1 and 2. The product is a six membered ring with a bond to X on carbon 1 and a bond to Y on carbon 2.
We know that an addition reaction is one in which a molecule is added across the double bond to yield a saturated product. The reaction A described has to do with he addition of a molecule XY to a six member alkene to obtain the saturated product as described.
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what do we call the cammell their
Answer:
You have to write the full question
Which unit is 10,000 times LARGER than the MICRO unit?
Answer:
Micro means 0.000001. So 10,000 times larger than that is the Centi unit, which is 0.01
outlines four uses of fat and oil
Fats and oils are used throughout the world for both food applications and industrial uses. They are consumed in butter, shortening, margarine, salad oils, and cooking oils, as well as in animal feeds, fatty acids, soaps, personal care products, biodiesel, paints (made from alkyd resins), lubricants, and greases.
What is epoxy?
………………..
Answer:
Epoxy is the family of basic components or cured end products of epoxy resins.