Answer:
the structure of an atom, theoretically consisting of a positively charged nucleus surrounded and neutralized by negatively charged electrons revolving in orbits at varying distances from the nucleus, the constitution of the nucleus and the arrangement of the electrons differing with various chemical elements.
Explanation:
limnetic, profundel, littoral, and benefitic have what in common
Can someone please help me quick !!!
Calculate the molarity of 4.07 x 10^2 mL of solution containing 19.4 g of potassium iodide.
Answer: 0.287 M
Explanation:
Molarity is [tex]M=\frac{n}{v}[/tex]. n is moles or solute and v is volume of solution in liters. Since we are given the grams of potassium iodide, we want to convert that into moles. With the volume in mL, we want to convert that to liters.
[tex]19.4 g*\frac{1 mol}{166.0028g} =0.1169 mol[/tex]
[tex]4.07*10^2mL*\frac{1L}{1000mL} =0.407 L[/tex]
Now that we have moles and liters, we can find molarity.
[tex]M=\frac{0.1169mol}{0.407L} =0.287 M[/tex]
Now, we know the molarity is 0.287 M.
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Upwellings are the result of
A. the Coriolis effect.
B. gyres in the open ocean.
C. changes in the shape of coastlines.
D. wind and vertical movement of surface waters.
Answer:
it must be the answer C.
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hope it will help you
What is laughing gas?
Answer:
Nitrous oxide, commonly known as laughing gas or nitrous, is a chemical compound, an oxide of nitrogen with the formula N ₂O. At room temperature, it is a colourless non-flammable gas, with a slight metallic scent and taste. At elevated temperatures, nitrous oxide is a powerful oxidiser similar to molecular oxygen.
Explanation:
Carbon is considered which of the following?
atomic element
molecular element
molecular compound
ionic compound
None of these
Answer:
Atomic element
Explanation:
Carbon is considered an atomic element. Therefore, the correct option is option A among all the given options.
Chemical element carbon has the atomic number six and the letter C assigned to it. It has a tetravalent atom, which means that four of its electrons may be used to create covalent chemical connections. It is nonmetallic. The periodic table's group 14 includes it. The crust of the Earth contains 0.025 percent carbon. There are several ways in which the carbon atoms can connect, giving rise to different allotropes of carbon. Amorphous carbon, diamond, graphite, and fullerenes are examples of well-known allotropes. Carbon is considered an atomic element.
Therefore, the correct option is option A among all the given options.
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Radiation that travels across distances in
the form of waves is which of the
following?
A. matter
B. a cell
C. a vacuum
D. energy
Answer:
i think the answer is D. energy
Explanation:
What is happening at point C in the diagram? HEEEEELPPPP!!!!
Answer:
The answer is B
Explanation:
Because conduction of heat or electricity occurs through a medium(for eg. The heat from a fire going through a metal pot . So in this example the pot is the medium of conduction).
And in this question the medium of heat conduction is the ground, with the heat moving in an upward motion .
10 POINTS PLS HELP
Combustion occurs when _____.
oxidation reactions are very slow
oxidation reactions are so fast the substance catches fire
oxygen is removed from another substance
machines use chemical energy to do work
Answer: oxidation reactions are so fast the substance catches fire
Explanation:
Answer:
When oxidation reactions are so fast the substance catches fire
Explanation:
because i am big bwain
2. Which test for iron(II) ions is conclusive
Answer:
please brainlist answer
Explanation:
The addition of K 3 Fe(CN) 6 to a solution causes the formation of a deep blue precipitate which indicates that iron(II) ions are present.
The conclusive test for iron(II) ions is the test by the use of potassium hexacyanoferrate III solution.
In qualitative analysis certain reagents are used to test for the presence of certain cations or anions. Those reagents react in a certain way with those reagents. Usually, a positive test may involve a color change, formation of a precipitate or evolution of a gas.
In the case of iron(II) ions, potassium hexacyanoferrate III solution is used in the conclusive qualitative test for the ion. A positive test involves the appearance of a deep blue precipitate.
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Explain why HCl can be a strong electrolyte, but a dilute HCl solution can be a poor conductor?
Answer:
Because as the concentration is diminished, the capacity to transfer electricity is diminished as well.
Explanation:
Hello!
In this case, since electrolytes are substances that are able to conduct the electricity in aqueous media (solutions in which water is the the solvent) because they have the capacity to form ions with both positive and negative charges, due to the fact that HCl is a strong acid, we notice it is fully ionized in solution and therefore it is a strong electrolyte. However, when the concentration is diminished, we can notice that strength is diminished as well because less ions will have the capacity to transfer the electricity and therefore it'd become a poor conductor or weak electrolyte.
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How is the difference in the physical properties of the powdered mixture components being used to separate them in this lab
Answer:
This question is incomplete but the missing part is in the picture attached.
Explanation:
A mixture of silicon oxide, ammonium chloride and sodium chloride were to be separated. Three separating techniques were used in the experiment; sublimation, decantation and evaporation.
Sublimation is the process in which a substance changes from solid to gas without passing through the liquid phase. Ammonium chloride (NH₄Cl) is a substance that has the ability to sublime and thus was separated first through this property before adding water to the remaining constituents (silicon oxide and sodium chloride) of the mixture. After the addition of water to the mixture, sodium chloride dissolves in this water while silicon oxide does not dissolve in water. The mixture is then left to stand for some minutes so the undissolved sand can settle at the bottom of the mixture and the dissolved salt water can be decanted out so as to have the silicon oxide left in the jar.
The salt solution decanted will have to be evaporated to dryness (to remove the added water) so as to have the solid salt back.
Name the EXOTHERMIC phase changing process in the diagram below:
Answer:
it's most likely liquid to gas, solid to gas, and solid to liquid
Explanation:
the layering of rock horizontally is for the __________ only.
A. relative age
B. same age
C. absolute age
Answer:
A
Explanation:
what uses the predictable rise and fall of ocean water.
(IM ONLY ALOWED TO GIVE 10 POINTS) Sound travels at a speed of 330 m/s. How long does it take for the sound of thunder to travel 1745 meters?
Group of answer choices
5.28 seconds
5.28 hours
575850 seconds
189 seconds
Pleaseee answer need help
Answer:
I think its protons
Explanation:
Electrons usually seem like the right answer but since electrons are negative and so our neutrons so its protons.
When a metal reacts with hydrogen carbon dioxide gas is produced? True or False
Answer:
false
Explanation:
"When a metal reacts with hydrogen carbon dioxide gas is produced" statement is false.
What is a chemical equation?A chemical reaction is a representation of symbols of the elements to indicate the amount of substance and moles of reactant and product.
Generally, metals do not react with hydrogen. But some metals like sodium, potassium, calcium and magnesium force the hydrogen atom to accept the electrons given by these elements and form salt-like ionic solid compounds called metal hydrides.
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Plsss help I will be giving branliest to most helpful answer
Convert 85.02g to mg (1 mg=10^-3g)
Answer:
85,020 milligrams
Explanation:
Multiply the mass value by 1,000
Calculate the percent composition by mass of each element in Al(OH)3.Al(OH)3. Use at least three significant figures.
Answer:
Explanation:
Al(OH)₃
Total molecular weight = 27 + 3 x ( 16+1)
= 78
Al = 27
% of Al = 27 x 100 / 78 = 34.61%
O = 48
% of O = 48 x 100 / 78 = 61.55 %
H = 3
% of H = 3 x 100 / 78
= 3.84%
Al = 34.61%.
O = 61.55%.
H = 3.84%.
The definition of having to do with the physical properties and terrain of an area refers to the
term
environmental
forecasting
meticulous
topographical
adjacent
Answer:
Topographical
Explanation:
When it comes to questions such as this one, the thing that could help you the most is a dictionary. A dictionary is an alphabetically arranged listing of words that contains various information about those words, such as their definitions, examples, origin, pronunciation, etc.
The term the given definition refers to is topographical. Topography is the study of the forms and features of land surfaces. The topography of an area refers to its physical properties and terrain or their description (e.g. how they're shown on a map).
Hat is the answer for this
Answer:
C
Explanation:
Answer:
I think is A
Explanation:
Hope it helps
There is a structure of CH3CHCH2CH2CH3, with a –CH3 group attached to the second (from left to right) carbon.
Spell out the full name of the compound
Explanation:
2-methyl pentane
At first, we need to select a long chain.
Then, we should number that chain (Numbering will start from that side from which attachment is closer)
Then, For IUPAC name, at first we write the position at which substituent is attached then, name of subsitent and finally the chain name and suffix.
Here,
position of substituent = 2
name of substituent = -methyl
chain name = pent
suffix = -ane
Then,
IUPAC name is 2-methyl pentane
A vertical column of elements in the periodic table is called a
.
A horizontal row of elements in the periodic table is called a
.
Atoms of elements in the same group have the same
.
As you move from left to right on the periodic table, the atomic number
Answer:
A. group
B. period
C. numbers of valence electrons
B. increases
Which of the following contain ionic bonds? (select all that apply)
options:
FeCl3
CO
KI
CaSe
N2S
CO2
RbI
PCl3
Answer:
fecl3 contains ionic bonds
Automobile air bags use the decomposition of sodium azide as their sources of gas for rapid inflation, represented in the reaction below. What mass (in grams) of NaN4is required to provide 40.0 L of N2 at 25°C and 763 torr?
Answer:
The answer is 95 degree celcius
Why are metals malleable?
A. Because their lattice energy is very high
B. Because they are made of atoms that have tightly held electrons
C. Because of their structure and uniform bonding in all directions
D. Because they reflect incoming photons
Answer: All I know is it's that opposite of B this may not help but I hope it does.
Explanation:
Answer:
C
Explanation:
ap3x
Help!
What is the molar mass of oxygen (O2)?
A- 15.9994 g/mol
B- 1.204 x 1024 g/mol
C- 6.02 x 1023 g/mol
D- 31.9988 g/mol
Answer:
Answer:
15.9994 g/mol
To measure the amount of iron in a certain type of iron ore, an analytical chemist dissolves a sample in strong acid and titrates it to the endpoint with of potassium permanganate solution. The balanced chemical equation for the reaction is:
Answer:
[tex]\% Fe=11.4\%[/tex]
Explanation:
Hello!
In this case, for the described chemical reaction, we find it is:
[tex]8H^+(aq)+5Fe^{2+}(aq)+MnO_4^-(aq)\rightarrow 5Fe^{3+}(aq)+Mn^{2+}(aq)+4H_2O(l)[/tex]
Because it says that the iron is dissolved in a strong acid which provides addition hydrogen ions to the reaction media. Thus, for the questions attached on the figure we find:
- This a REDOX reaction because we see iron is being oxidized from 2+ to 3+ and manganese reduced from +7 to +2.
- Since it is a redox reaction and the oxidized species is that undergoing an oxidation number increase, we evidence iron goes from +2 to +3, which means iron is the oxidized species.
- In this case, for the used 59.2 mL (0.0592 L) of the 0.2000 M solution of potassium permanganate, we can compute the consumed grams of iron via stoichiometry including the 5:1 mole ratio between them in the chemical reaction:
[tex]m_{Fe^{2+}}=0.0592L*0.2000\frac{molMnO_4^-}{L}*\frac{5molFe^{2+}}{1molMnO_4^-} *\frac{55.85gFe^{2+}}{1molFe^{2+}} \\\\m_{Fe^{2+}}=3.31gFe^{2+}[/tex]
It means that the percent of iron in that sample is:
[tex]\% Fe=\frac{3.31g}{29.00g} *100\%\\\\\% Fe=11.4\%[/tex]
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