which type of model best represents simple molecules?
> ribbon
> wire
> Lewis dot
> structural formula
Answers
Answer:
Lewis dot
Explanation:
It's a very simplified representation of the valence shell electrons in a molecule.
The correct answer is Lewis dot.
A Lewis dot structure of a molecule is a structure in which the valence electrons of the molecule are represented using dots.
It is usual to seek a simple representation for simple molecules that explains in part, the properties of the molecule.
Such a representation must show the valence electrons in the molecule. A simple representation that can do this is the Lewis dot structure of molecules. The Lewis dot structure of NO2 molecule is shown in the image attached to this answer.
It was introduced by G.N Lewis and can be successfully used to represent many simple chemical molecules.
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Related Questions
Which of the following is an example of the geosphere interacting with the atmosphere?Streams become muddy due to erosion.
Volcanic eruptions release gases into the air.
Rocks crack open when water in the cracks freeze.
Plants absorb carbon dioxide and produce oxygen.
Answers
Answer:
Volcanic eruptions release gases into the air.
Explanation:
This is because the atmosphere collects the gas from the volcano, the volcano is apart of the geosphere because it is a part of the earth's surfaces.
are these following a basic radical or acid radical?
1. Chlorate
2. Peroxide
3. Silver
4. Zinc
5. Nitrite
Answers
Answer:
chlorate=Acid
peroxide=Acid
silver=Acid
zinc= Basic
nitrite=Acid
Chlorate
Why is particle size the main parameter used in selecting a mechanical phase-separation device?
Answers
Answer:
This is because mechanical phase-separation device such as filtration, centrifugation etc operate according to the unique particle size feature in which they are designed to separates.
The process of centrifugation separates particles of size range between 0.1 μm to 5.0 μm efficiently.
The process of filtration however varies as there are different types of pore sizes which covers a wide range of particle sizes.
In science class, Jake mixed water with differing amounts of an unknown liquid. After mixing the liquids, he heated 20 milliliters (ml) of each mixture and observed how quickly it boiled. The table shows his results.
Answers
According to the question, each mixture decrease the boiling point of the water.
What is boiling point ?Boiling temperature is defined as the temperature at which liquid change into a vapour at the atmospheric pressure at sea or ocean level.
For example the boiling temperature of water is 100 degree celcius.
Thus, each mixture decrease the boiling point of the water, option "A" is correct.
To learn more about boiling point click here:
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Which of the following is the formula for vanadium (II) oxide? Question 11 options: A) VO2 B) VO C) V2O3 D) V2O5
Answers
Answer: A. ( VO2)
Explanation:
Answer:
B) VO
Vanadium(II) oxide is the inorganic compound with the idealized formula VO.
full form of soil pH
Answers
Answer:
PH STANDS FOR POTENTIAL OF HYDROGEN .
It represents the ratio of Hydronium ions (H3O) to Hydroxide ions (OH). It is a measure of acidity and alkalinity of a solution.
FOLLOW MEcan someone tell me what does the numbers in the circle mean? and how do I find it?
Answers
Answer:
Electronic configurations of three magnesium atoms and two nitrogen atoms.
[tex]{ \sf{.}}[/tex]
If you started with 2 moles of Nitrogen and 3 moles of Hydrogen, then you
would not have any leftover reactants. Explain which material would be
limiting since no hydrogen or nitrogen were left over?
N2 + 3H2 -> 2NH3
Answers
Answer: 0.3 moles NH3
Explanation:
I'll GIVE BRAINLIEST: In a redox reaction, CO is changed to CO2. How many electrons must be lost or gained by C and why?
Answers
Answer:
C is gaining 2 electrons
Explanation:
O has a 2- charge so for CO to pick up another O atom would add 2 more electrons.
Answer:
C gains 2 electrons
Explanation:
In the redox reaction, CO is changed into CO2 which means there is an additional oxygen. Oxygen loses 2 of its electrons in order to neutralize. So, C must be gaining 2 electrons in order to make the bond.
10. What do you understand by a balanced chemical equation? Explain with the an example.
Answers
Example: aerobic respiration
C6H12O6 + 602 —> 6CO2 + 6H2O
Hope this helps and please give me a brainliest:))
13. Water is a polar compound because it exhibits _______
charges.
O A. negative
O B. positive
O C. opposite
D. neutral
Answers
Answer:
Opposite.
Water exhibits negative charge near hydrogen, positive near oxygen.
This is why it is OPPOSITE.
Let me know if this helps!
Water is a polar compound because it exhibits opposite charges. Therefore, option C is correct.
What is polar compound ?The term polar compound is defined as the compound with distinct regions of positive and negative charge, as a result of bonding with atoms such as nitrogen, oxygen, or sulfur.
Water is a polar compound because the covalent bonds between hydrogen and oxygen in the water molecule are polar in nature. Any molecule with lone pairs of electrons around the central atom is polar compound.
In water there are two atoms are present that are oxygen and hydrogen. Hydrogen has positive charge while oxygen has negative charge,
Thus, Water is a polar compound because it exhibits opposite charges, option C is correct.
To learn more about the polar compound, follow the link;
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How Chemistry and Earth Science are Connected?Can you tell me completely?
Answers
Explanation:
Because chemistry deals with the structure of matter (such as the structure of the atom, it is related to physics. ... Because geology involves study of the matter the Earth and other bodies in the solar system are made of, geology involves chemistry. Geochemistry is the study of Earth materials, and how they change.
Question 2 of 10
How might the government make sure scientific research is done in an ethical
way?
A. By encouraging scientists to perform within their own ideas of
right and wrong
B. By letting public opinion determine what is ethical in scientific
research
C. By allowing scientists to do what they think is best
D. By taking away research funds if certain ethical standards are not
met
Answers
Answer: D
Explanation:
Question 2 of 10
How might the government make sure scientific research is done in an ethical
way?
A. By encouraging scientists to perform within their own ideas of
right and wrong
B. By letting public opinion determine what is ethical in scientific
research
C. By allowing scientists to do what they think is best
D. By taking away research funds if certain ethical standards are not
met
Answers
Answer:
C I think. If I am wrong please correct me.
Explanation:
What is indicated by 'A' in the figure below? A. -VE B. +Ea C. -Ea D. +VE
Answers
Answer:
+VE
Explanation:
If we look at the reaction profile pictured in the question, we can easily identify A as the enthalpy of the reaction. The enthalpy of reaction (ΔHrxn) is usually defined as the difference between the total enthalpy (heat content) of the products of a reaction and the total enthalpy (heat content) of the reactants in that reaction.
Looking at the figure, we can see that the enthalpy of products is greater than the enthalpy of reactants, hence ∆Hrxn is positive as stated in the answer above.
What would be the pH of an HNO3 solution if the [H+] = 3.26 x 10-6 moles/liter? 5.49 4.67 6.32
Answers
Answer:
5.49
Explanation:
pH = - log[3.26 x 10-6] =5.49
Examine the given reaction. NH4NO3(s) → NH4+(aq) + NO3–(aq) ΔH° = 25.45 kJ/mol ΔS° = 108.7 J/mol·K Which of the given is correct about the ΔG° at 25 °C?
A)+4,360 J
B)−6,942 J
C)−4,360 J
D)+6,942 J
Answers
Answer:
B)−6,942 J /mol
Explanation:
At constant temperature and pressure, you cand define the change in Gibbs free energy, ΔG, as:
ΔG = ΔH - TΔS
Where ΔH is enthalpy, T absolute temperature and ΔS change in entropy.
Replacing (25°C = 273 + 25 = 298K; 25.45kJ/mol = 25450J/mol):
ΔG = ΔH - TΔS
ΔG = 25450J/mol - 298K×108.7J/molK
ΔG = -6942.6J/mol
Right solution is:
B)−6,942 J /molExplain how the energy of a toy car is transformed as it slides down a ramp. Give evidence that the energy of the car remains the same at all points on the ramp. (30 points)
Answers
Answer:
As the car starts to slide down the ramp, it is kinetic energy and when it's on the top of the ramp, it is potential energy. We can see that the energy is now being transferred through the car and ramp.
Am I correct?
(Plz don’t used this for points or typing random things…plz don’t)
Answers
Answer and Explanation:
The answers would be:
A. Domestic cats live in about 34% of homes in the United States. (Statistical statements are, most of the time, facts and not an opinion)
C. Modern domestic cats are closely related to Near Eastern wildcats. (Fact)
D. Cats eat rodents that can spread disease. (Fact)
The above statements are facts because they don't make a judgement or show a position on the topic, only show what is known and proven to be true.
B and E are incorrect because they take a side of the topic, in which someone else might disagree with the opinion. These opinions aren't proven to be true.
#teamtrees #PAW (Plant And Water)
I hope this helps!
Luisa is flying from Dallas to New York to visit her cousin. Her carry-on bag weighs 39.4 lbs. However, there is a weight restriction of 18 kg per bag. Will she be permitted to bring her bag on the plane?
Answers
39.4 lb = 0.45359237 *39.4 kg
39.4 lb = 17.87 Kg
She be permitted to bring her bag on
Less then 18 kg
I'm a hot 15yo boy hml
Answers
Answer:
great
On a scale of 1-10 I give you a 10
Explanation:
what about brainliest
Answer: I agree 100%
Explanation: But you may be too hot for me lol.
Hòa tan hoàn toàn 10 gam hỗn hợp hai oxit CuO và Fe2O3 cần 100ml dung dịch HCl 3,5M. Khối lượng CuO và Fe2O3 có trong hỗn hợp ban đầu lần lượt là
Answers
Answer:
CuO+2HCl>h2o+CuCl2
fe203+6hcl->2fecl3+3h2O
gọi CuO, fe2o3 lần lượt là x,y
80x+160y=10
2x+6y=0.35
giải phương trình ta dc hai số x,y(tính phương trình kia ra)
cuo ban đầu sẽ là :60*x=z
fe203 ban đầu sẽ là :10-z=
Explanation:
The density of a 39 gram object with a volume of 5 cm is
Answers
Answer:
[tex]\huge\boxed{\sf D = 7.8 \ g/cm^3}[/tex]
Explanation:
Density = Mass / Volume
Where Mass = 39 g and Volume = 5 cm³
So,
[tex]\sf Density = \frac{39}{5} \\Density = 7.8 g/cm^3[/tex]
Mention the four characterstics of warm blooded animals.
Answers
Answer:
The four characrteristics of warm blooded animals are÷
Explanation:
i=They can keep its body temperature the same no matter what the outside temperature .
ii=They can maintain a constant body temperature.
iii=They obtain energy from food consumption.
iv=They maintain their body temperature higher than environment.
Answer:
i) Their body temperature remain constant in any climate.
ii) They obtain energy from food consumption
I only know this much:)
Help pls!! Will having to do course recovery to make up a pass grade affect your college application In a bad way and how colleges see you?
Answers
lab report evidence of plate motion
Answers
Explanation:
There is variety of evidence that supports the claims that plate tectonics accounts for
(1) the distribution of fossils on different continents
,(2) the occurrence of earthquakes, and
(3) continental and ocean floor features including mountains, volcanoes, faults, and trenches.
MARK AS BRAINLIST IF IT IS USEFUL
Describe the formation of oxygen molecule
Answers
Answer:
oxygen molecule has two oxygen atom . Each O atom share 2 electrons to form two covalent bonds out of which one is sigma bond and other is pi bond . sigma bond is formed by axial overlap 2p atomic orbitals of oxygen and pi bond is formed of lateral overlap of 2p atomic orbitals of oxygen .
what is non lustrous ?
Answers
Answer:
materials which do not show the quality of lustre i.e. shiney surface
for eg- non metals except Iodine
Explanation:
hope it helps u plz mark as the brainliest
Answer:
These are materials that don't have lustre
Explanation:
They are not shiny.
They include non-metals but not iodine.
Hope it helps.
describe how thin layer chromatography is used in the isolation and extraction of lipids
Answers
Thin layer chromatography(TLC) works with the principle of separation through adsorption.
It is used in the isolation and extraction of lipids through the following steps:
apply the lipid samples spots in the bottom of the plate.also apply sample solution to the marked spotpour the mobile phase into the TLC chamber and use a moist filter paper to cover it. this is done to maintain equal humidity.then place the plate in the TLC chamber and close it with a lid.the plate is immersed into the solvent (mobile phase) for its development. this is done, keeping in mind that the sample spot should be above the solvent.once the sample spots are developed, they are removed and dried.this is later viewed using the UV light chamber to see the isolation of the lipid sample.Learn more here:
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The specific heat capacity of a pure substance can be found by dividing the heat needed to change the temperature of a sample of the substance by the mass of the sample and by the change in temperature. The specific heat capacity of a certain substance has been measured to be 3.52 J/g °C. Suppose 420.0 g of the substance is heated until the temperature of the sample has changed by 43.8 °C.
Write an equation that will let you calculate the last Q that was needed for this temperature change. Your equation should contain only symbols. Be sure to define each symbol.
Answers
Answer:
The answers to your questions are given below.
Explanation:
Data obtained from the question include:
Mass (M) = 420.0 g
Temperature change (ΔT) = 43.8 °C
Specific heat capacity (C) = 3.52 J/g °C
Heat needed (Q) =...?
The heat needed for the temperature change can be obtained by using the following formula:
Q = MCΔT
Where:
Q is the heat needed measured in joule (J).
M is the mass of substance measured in grams (g)
C is the specific heat capacity of the substance with unit J/g °C.
ΔT is the temperature change measured in degree celsius (°C).
Thus, we can calculate the heat needed to change the temperature as follow:
Q = MCΔT
Q = 420 x 3.52 x 43.8
Q = 64753.92 J
Therefore, the heat needed to cause the temperature change is 64753.92 J