A typical tincture of iodine contains about 2.0% iodine by mass. Calculate
the mass of iodine in a 500. g tincture.
Explain why is ortho nitrophenol more acidic than ortho methoxyphenol
Answer:
Ortho nitrophenol is more acidic than ortho-methoxyphenol.
Reason:
This is because the nitro-group is an electron-withdrawing group. In the case of ortho methoxyphenol; methoxy group is an electron-releasing group. Thus, it increases the electron density in the O−H bond and hence, the proton cannot be given out easily.
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What is the purpose of a spectroscope? *
A. to spread light into different wavelengths
B. to study a star's composition
C. to study a star's temperature
D. all of the above
PLEASE HELP!!
With reference to He-4 (or the diagram), explain the term isotopes.
Answer:
Isotopes are basically atoms of an element that have an unequal number of neutrons and protons. Of course the proton number remains the same, but the neutron number either decreases or increases, which leads to an overall change in mass. However, no chemical properties of the atom/element are changed as the electrons are the same number and do not react. In regards to Helium 4, the original number of neutrons in Helium is 2, and protons 2 as well. We see an equal number of neutrons and protons, hence an unchanged mass, and the element is not an isotope.
Sophia was fascinated while studying the role of oceans in the hydrosphere. She decided to illustrate the features of the ocean floor on a poster for her part in a group project. Identify and describe the kinds of features found on the ocean floor.
Answer:
The Major features of the ocean floor are:
Continental ShelfContinental SlopeContinental RiseAbyssal PlainOceanic TrenchMid-Ocean RidgeExplanation:
1. Continental Shelf: This refers to the part of the land on every continent that is covered with water that is not too deep. The types of animals that can be found on the continental shelf are:
Crab, Tuna, Lobster, Dungeness cod, etc. Within the Continental shelf, there are permanent rocks that house other organisms such as sponges, anemones, clams, sponges, oysters. The continental shelf also contains the route of migration for bigger animals such as sea turtles dolphins and even whales.
2. Continental Slope: This spans from the shelf break to the continental rise. It can slope up to 4 degrees. Slopes can be created by faulting, slumping of huge boulders of sediments, rifting, etc.
Some of the aquatic animals that can be found in this region include but are not limited to:
Sablefish, Dover sole rockfish, etc.
3. Continental rise
This part of the ocean floor usually has a very steep gradient or angle slope. It slopes very steeply into the abyssal plain of the ocean.
The following can help form continental rise:
Mass wasting;deposition from contour currents and the longitudinal settling of biogenic and clastic particles4. Abyssal Plain.
This is the real bottom of the ocean. There is a very high probability that one would find animals such as nematodes, polychaetes, etc which are all types of worms down there. The Abyssal plain is also home to molluscs, and echinoderms.
5. Oceanic Trench
Sometimes there is a long and narrow indenture or depression along the seafloor. These are called Trenches. Trenches are sometimes formed by the boundaries between one lithospheric plate and another. The deepest trench on earth is found in the Pacific Ocean. It has been nick-named the Challenger Deep and said to be the deepest point known on earth reaching almost 11 kilometers.
6. Mid-Ocean Ridge
This is a mountain range underneath the ocean. It is formed when there is an upward push by convection currents of the mantle beneath the oceanic crust. When this happens and molten magma is ejected or created at the boundary between the plates, the result is a Mid-Oceanic Ridge.
Cheers
True or False: The octet rule states that an atom will gain or lose electrons to achieve a
stable valence electron configuration.
Answer:
they will tend to do that yes
Explanation:
How are stars and comets different?(2 points)
A star has a solid rock and gas surface, while a comet has tail of dust and gas.
A star has a tall of dust and gas, while a comet has a solid rock surface.
A star is made up of burning gases, while a comet is made up of ice, gases, rocks, and dust.
A star is made up of Ice, rocks, and dust, while a comet is made up of burning gases.
Answer:
A star is made up of burning gases, while a comet is made up of ice, gases, rocks, and dust.
Explanation:
Answer:
Its D "A star is made up of Ice, rocks, and dust, while a comet is made up of burning gases."
Explanation:
Picture down below!!
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Some seawater is evaporated. The sea salt obtained is found
to be 86% sodium chloride. How much sodium chloride
could be obtained from 200 g of this salt?
Answer:
the answer is 172g
Explanation:
200 × 0.86 = 172g
Identify the type of reaction and the products. AlP ->
Answer:
Decomposition and Al and P
they might be looking for thermal decompositioin as this one happens at 2000 degrees
Explanation:
What is the SI unit of time?
A.
second
B.
minute
C.
hour
D. day
Answer:
option a. second
.............
can someone help me with all of those pls!!!!
Is this the right answer
Answer:
srgerhe5h4hebdfbdfdfnafyn
Explanation:
What is Metabolism?
A)The body
B)The Cells
C)The body's use of molecules for energy and growth
D)Eating food when you are hungry
Answer:
C I think.
Explanation:
Which is true about the compounds carbon monoxide (CO) and carbon dioxide (CO2)?
A. The compounds have the same properties because they contain the same elements.
B. The compounds have different properties because they are found in different amounts in the atmosphere.
C. The compounds have the same properties because they are both gases.
D. The compounds have different properties because they contain the same elements in different quantities.
Answer: D. The compounds have different properties because they contain the same elements in different quantities.
Explanation:
Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass. It can be decomposed into simpler constituents using chemical reactions.
[tex]CO[/tex] contains carbon and oxygen in the ratio of 3: 4 by mass whereas [tex]CO_2[/tex] contains carbon and oxygen in the ratio of 3: 8 by mass.
The physical properties of two different compounds are different as they contain same elements but the elements are present in different ratios.
solution containing more solute than can theoretically dissolve at a given temperature
Answer:
Explanation:correct because the chlorine can make it change so the soulation is dissloving
Another student suggests putting some cotton wool in the top of the flask.
Suggest why this improves the investigation. *
(1 Point)
Answer:
B proofread the message.
Explanation: Hope this helped
Which of the following would SLOW DOWN the rate of chemical
weathering?*
Decreasing surface area
Increasing the temperature
Increasing rainfall
O Increasing surface area
Answer:
increasing rainfall. hope it help
When two objects with neutral charges are brought together, the objects
a. attract each other
b. repel each other
c. all of the above
d. none of the above
Answer:
a. attract each other
Explanation:
Which characteristic is true of sexual reproduction but not of asexual reproduction?
Answer:
j one or more parents. that's the answer
Minerals are part of the Geosphere, which is composed of several layers.
O True
O False
Solve fort t
t + 11 = 20
I’m boat to give up u the goat
Answer:
t = 9
Explanation:
t + 11 = 20
-11
t = 9
how are inclined planes used in the real world
Answer:
hi
Explanation:
Inclined planes are widely used to move heavy loads over vertical obstacles; examples vary from a ramp used to load goods into a truck, to a person walking up a pedestrian ramp, to an automobile or railroad train climbing a grade. ... The screw consists of a narrow inclined plane wrapped around a cylinder.
Have a nice day
2B + 3H2 2BH3
How many moles of BH3 are synthesized when 27.0 moles of H2 completely react?
Answer:
fa o poză te rog frumos ca nu stiu ce ex este
What do plants need in order to make food?
A. water, energy, oxygen
B.carbon dioxide, energy, oxygen
C.water, energy, carbon dioxide
D.water, oxygen, carbon dioxide
Answer:
Water, solar energy, carbon dioxide
Explanation:
If heat is absorbed by the system from the surroundings in a
chemical reaction or physical change, it is called an___
process.
I
Answer:
I think its evaporate
Explanation:
because when the heat absorbed the chemicals evaporate
The bacteria can chemically combine nitrogen with hydrogen to form ammonia (NH3). This combining process is called nitrogen fixation.
Which group of organisms chemically combines nitrogen with hydrogen in a process called nitrogen fixation?
birds and reptiles
all mammals
bacteria
only aquatic plants
Answer:
bacteria
Explanation:
they are decomposers. they decompose dead material by fixing nitrogen
What happens to the hydrogen-hydrogen and nitrogen-nitrogen bonds?
Answer:
hydrogen nitride
Explanation:
since they are bounding they would become a compound, and so it would need to expand
The students in Miss Washburn’s class use different methods to conduct investigations. Which of the following is an example of an experiment?
Answer:
B
Explanation:
Got it right
Na2S + HCl NaCl + H2S NaCl Na + Cl2 Na2S + HCl NaCl + H2S balancing chemical equation
Answer:
Na2S + 2HCl -------------------> 2NaCl + H2S.
2NaCl --------------------------> 2Na + Cl2
Na2S + 2HCl ---------------> 2NaCl + H2S
Explanation:
Stoichiometry Is one of important aspect of Chemistry that will be taught to student learning chemistry. It shows the relationship between the reactants and the product. For instance, the amount a reactant reacts to form the products and the amount of products formed.
The balanced chemical reaction for the equation of reaction given in the question is given below;
Na2S + 2HCl -------------------> 2NaCl + H2S.
One mole of Na2S reacts with 2 Moles of HCl to produce 2 moles of NaCl and one mole of H2S.
2NaCl --------------------------> 2Na + Cl2
Two moles of NaCl breaks down into 2 moles of Sodium(solid) and one mole of Chlorine.
Na2S + 2HCl ---------------> 2NaCl + H2S
One mole of N2S reacts with 2 moles of HCl to produce 2 moles of NaCl and one mole of H2S.