Question 4 (1 point)
Model A
In the molecule above, the black circles are Carbon, the blue circles are Hydrogen
and the red circles are Oxygen. Which formula below is correct for this molecule?
C4H404
C2H402
Answers
Answer:
C2H4O2
Explanation:
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Related Questions
how many valence electrons are there in a magnesium atom?
Answers
Answer:
Magnesium has 2 valence electrons.
Lead has a density of 11.29 g/mL. If you had 186 g of lead, what would its volume be?
Answers
describe the development of the theory of atomic structure
this question is worth 6 marks
Answers
What could be a reason for the difference between the theoretical and experimental heats of reaction
Answers
Answer:
Theoretical value is the value a scientist expects from an equation, assuming perfect or near-perfect conditions. Experimental value, on the other hand, is what is actually measured from an experiment. Rarely (in fact never) are these numbers the same.
Take the area of a sheet of paper. I know that the area of a rectangle can be found by multiplying the lengths of both sides together. I can assume an 8.5x11 sheet, so I calculate exactly 93.5 square inches. This is my theoretical value. When I actually do the measurements on my paper, it turns out my paper has been slightly cut on one end, or I’m measuring with a shoddy ruler. Therefore, I might measure only 92.8 square inches. This is my experimental value. See thats it’s close, but not exact.
Expanding on this concept, quantum mechanics is so widely accepted in the scientific community because many theoretical values calculated by mathmaticians concurred with experimental values to many, many decimal places. These would be constants such as Plank’s Constant, energy levels of harmonic potentials, and energy levels of the hydrogen atom.
Explanation:
Theoretical result is based on information and mathematics. Trials or experiments are the foundation of experimental result. What ought to occur is theoretical probability. What actually occurs is experimental probability.
What is difference between theoretical and experimental result ?The definition of theoretical probability. It is not necessary to do the experiment and then analyze the findings for theoretical probability. The theoretical probability, however, represents what you anticipate will occur in an experimnet.
In experimental probability, information is gathered via repeated experimentation. In theoretical probability, data is gathered without doing the experiment by taking into account every possibility that has a chance of occurring.
Thus, difference between the theoretical and experimental heats of reaction the incomplete combustion may result in the formation of carbon and carbon monoxide instead of carbon dioxide and water.
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A clasping handshake may be used as an analogy for an enzyme-catalyzed reaction because it represents the specific manner in which an enzyme ________. folds to form secondary and tertiary structures interacts with water binds substrate is denatured by low pH
Answers
A clasping handshake is similar to the way in which enzymes bind to substrates in enzyme-catalyzed reactions.
Enzymes are biological catalysts that speed up the rates of biological reactions by lowering the minimum energy required by reactants in order to arrive at products.
Enzymes are able to achieve this feat by substrate-enzyme binding. The substrate binds to the enzyme in its active site, becomes products, and the products are released from the active site of the enzyme. Thus, the enzyme is free for the binding of another substrate.
More on enzyme-catalyzed reactions can be found here: https://brainly.com/question/6658074
11) When sodium metal is subjected to violet light, it causes the photoelectric effect. However, red light does not affect
the sodium. Explain this phenomena.
Answers
The maximum wavelength for which photoelectric effect occurs in sodium is 400 nm.
Photoelectric effect has to do with the ejection of electrons from a clean metal surface when energy is supplied in the form of light. All wavelengths of light are not capable of achieving photoelectric effect.
There exists a maximum wavelength that the incident rays must posses in order for photoelectric effect to occur. The maximum wavelength for which photoelectric effect occurs in sodium is 400 nm.
The wavelength of red light is around 625 - 740 nm which is far longer than the wavelength of violet light which is around 380 - 425 nm. Hence, when sodium metal is subjected to violet light, it causes the photoelectric effect but red light does not affect the sodium metal.
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Which of the following is/are considered alcohols?
a CH3OH
b CH3CH2OH
C CH3CH2CH2OH
d All of the above
Answers
Answer: THE ANSWER IS D
Explanation:
an alcohol is a hydrocarbon chain with an hydroxyl group (OH)
A, B, AND C ARE ALL ALCOHOLS, SO THE ANSWER IS D
What are the four groups of carbon compounds found in living things?
Answers
What do all atoms in a period (horizontal rows) have in common?
Answers
Answer:
All of the elements in a period have the same number of atomic orbitals. For example, every element in the top row (the first period) has one orbital for its electrons. All of the elements in the second row (the second period) have two orbitals for their electrons.
hope this helps
Explanation:
Elements in the same period are those that are in a single horizontal line from left to right. They do not share the same type of chemical reactivity as seen in groups. They only real thing that these elements share in common is the same principal quantum number, or main energy shell.
Elements in the same period in the same periodic table have the same ____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
Answers
Elements in the same period have the same number of electron shells; moving across a period (so progressing from group to group), elements gain electrons and protons and become less metallic. This arrangement reflects the periodic recurrence of similar properties as the atomic number increases.
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convert 120 mm to feet
Answers
Answer:
0.393701
Explanation:
JWhat type of evidence is gathering information through your senses or using scientific tools?
Predictions
Results
Scientific research
Observations
Answers
The salt which in solution gives a pale green precipitate with sodium hydroxide solutionanda white precipitate with barium chloride solution is?
Answers
Answer:
Analytical Chemistry. The salt which in solution gives a pale green precipitate with sodium hydroxide solution and a white precipitate with barium chloride solution is : Iron (III) sulphate.
In the chloroplast, energy in sunlight is passed around different chlorophyll molecules until it reaches a specific chlorophyll molecule that can transfer energy in sunlight to an energized electron. This chlorophyll molecule is called the accessory pigment. electron-carrier molecule. nucleus. photoelectric point. reaction center.
Answers
Answer:In the chloroplast, energy in sunlight is passed around different chlorophyll molecules until it reaches a specific chlorophyll molecule
Explanation:
Answer: In the chloroplast, energy in sunlight is passed around different chlorophyll molecules until it reaches a specific chlorophyll molecule
for each type of geometry in the simulation, examine the resulting bond angles by clicking the show bond angles checkbox. based on your observations for each geometry, provide the bond angles at the indicated locations for the two-dimensional representations of the three-dimensional structures.
Answers
The bond angles in PCl5 are 90° and 180° respectively. The bond angle in NH4^+ is 109°.
Bond angles refer to the angle between two atoms bonded to the same central atom. Several factors such as electronegativity difference and presence or absence of lone pairs on the central atom all affect the bond angle.
For NH4^+, the indicated bond angle is 109° and the specie is tetrahedral. For the specie, SF6, the indicated bond angles are 90° and 180° respectively. For HCN, the indicated bond angle is 180°. For PCl5, the indicated bond angles are 90° and 180° respectively.Learn more: https://brainly.com/question/2192784
the electron configuration of an element describes _____.
Answers
Answer:
here
Explanation:
This is the electron configuration of the element carbon.
describe the manufacture of ethanol from hexane?
Answers
Answer:
This page looks at the manufacture of alcohols by the direct hydration of alkenes, concentrating mainly on the hydration of ethene to make ethanol.
The steps in the ethanol production process include milling the corn to meal, liquefying the meal by adding water and cooking, breaking down starch into sugar, using yeast to ferment the sugar to ethanol, distilling the ethanol by boiling off and condensing it by removing residual water and finally denaturing so that...
what do you mean by decimal number system
please give answer
Answers
10m/s for 30 seconds
Answers
Answer:
300 meters for 30 seconds
Explanation:
10*30= 300 therefore giving you your answer.
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Darwin observed __________________ types of mockingbirds and finches lived in different island environments.
Answers
Answer:
Darwin observed many different types of mockingbirds and finches lived in different island environments.
how many electrons need to be lost or gained by Ca to attain noble gas electron configuration?
Answers
Answer:
six electrons need to be gained
Explanation:
Calcium has two valence electrons. To have a stable amount of valence electrons, or to attain noble gas electron configuration, an element needs to have eight valence electrons. Now, it's just a simple math problem. How many more valence electrons does calcium need to get to eight? It needs six, since eight minus two is six.
Hopefully that's helpful! :)
Which of the following is the best definition of deposition in geology?(1 point)
A:the creation of volcanic rock when liquid magma hits the ocean and cools
B:the mixing of many layers of sediment by wind, water or ice
C:laying down of sediment in layers carried by wind, water or ice
D:the creation of any metamorphic rock
Answers
Answer:
Deposition is the laying down of sediment carried by wind, flowing water, the sea or ice. Sediment can be transported as pebbles, sand and mud, or as salts dissolved in water.
Question 1 (2 points)
Which option can be classified as a pure substance?
Question 1 options:
heterogenous mixture
solution
homogenous mixture
compound
Question 2 (2 points)
Law of conservation of mass states that:
Question 2 options:
matter is destroyed
matter does not change
matter is neither created nor destroyed
matter is created
Question 3 (2 points)
What is a property of bases?
Question 3 options:
all of the above
Sour taste
Slippery touch
Ability to form hydronium ions+
Question 4 (2 points)
Which property do solutions with low pH values have?
What does it mean to have a neutral pH? - Aseptic Health
Question 4 options:
have a -OH group
feels slippery
turns litmus paper blue
tastes sour
Question 5 (2 points)
How do the products of chemical reactions compare to their reactants?
Question 5 options:
The products often have completely different properties than the reactants.
The products are usually more toxic than the reactants.
The products usuallyhave more mass than the reactants.
The products usually have more atoms than the reactants.
Question 6 (2 points)
Which of the following is an example of a physical change?
Question 6 options:
Water freezing into ice.
A piece of wood burning.
A toy car rusting.
Zinc producing hydrogen gas when mixed with water.
Question 7 (2 points)
What might happen if you mixed a strong acid with an equally strong base?
Question 7 options:
You would see an explosive chemical reaction.
The base would destroy the acid.
You'd wind up with a pH-neutral salt and water.
The acid would destroy the base.
Question 8 (2 points)
In the equation shown, what are the reactants?
2H2+O2àH2O
Question 8 options:
Hydrogen and oxygen molecules (2H2 and O2 )
Ice crystals
Hydrogen atoms (H)
Water molecules (H2O)
Question 9 (2 points)
Which phrase most accurately describes a chemical change?
Question 9 options:
A change in form
A change in taste
A change on the molecular level
A change in appearance
Question 10 (2 points)
What does it mean when there is a physical change?
Question 10 options:
A new substance has been formed.
Matter has changed from one substance into a new substance.
Matter has changed size, shape or form
Matter has changed on the molecular level.
help pls ill give 20 points!
Answers
Answer:
I didn't KNOW WHAT IS THE ANSWWR OF YOUR QUISTION IM SO SORRY
Explanation:
I WANT TO INTRODUCE SELF TO YOU CAN I
Review the information from the documents you read for this assignment. Use what you learned to answer the following question. What were the major effects of a dust storm? Give your answer in at least four sentences.
Answers
Answer:
what people experienced during a dust storm
how people reacted to a dust storm
what people did after a dust storm
Explanation:
i passed
Answer:
what people experienced during a dust storm
how people reacted to a dust storm
what people did after a dust storm
Explanation:
Atoms: SC.8.P.8.7
Match the definition to proper definition:
Term:
Definition:
1. Atoms
A.Positive subatomic particles found in the
nucleus of the atom
2. Neutron
B. Negative subatomic particle found in the cloud
3. Proton
C. Substance that has no electrical charge
4. Nucleus
D. Basic building block of all matter
5. Electron cloud
E. Substance that consists of only one type of ato,
6. Electrons
F. Center of an atom with a positive charge
G. Outside of the atom with a negative charge
7. Element
Answers
Answer:
1 = D
2 = C
3 = A
4 = F
5 = G
6 = B
7 = E
Study the chemical equation.
Na + Cl2 → NaCl
Is the chemical equation properly balanced?
Answers
what is the mass percent of hydrogen in water
Answers
Answer:
11.11%
Explanation:
The percentage of an element in a compound is 100 times the fraction, so for water the mass percent hydrogen is 11.11%
Hope this helps :)
Determine the pH of 7.53 x 10-4 mol/L calcium hydroxide solution
Answers
Answer:
pH = 11,17
Explanation:
[tex][OH^{-} ] = \frac{n_{OH^{-} } }{V} = \frac{2n_{Ca(OH)_{2} } }{V} = 2[ Ca(OH)_{2} ]\\[/tex]
[tex]Ca(OH)_{2}[/tex] → [tex]Ca^ {2+}[/tex] + [tex]2OH ^ -[/tex]
[tex]7,53.10^-4[/tex] → [tex]7,53.10^-4[/tex] → [tex]1,506^-3[/tex]
pOH = -log [[tex]OH^-[/tex]] = [tex]-log 1,506^{-3}[/tex] ≈ 2,822
pH = 14- pOH = 14-2,822 = 11,178
PLZ HELP i need it now
Answers
What were the first 5 planets that were observed? Why were those the only ones? Help pls!