Answer:
The branch of chemistry that best describes the chemist´s work is organic chemestry
Explanation:
The chemist wants to improve the process for natural gas, a mix of organic compuond, mainly alcans.
A research to find the better way to process natural gas after it is removed from the ground is a work in organic chemistry.
What is organic chemistry?Organic chemistry deals with organic compounds, their properties, reactions, uses etc. The organic compounds are hydrocarbons and its derivatives contain carbon chains attached with hydrogen in the backbone.
Natural gases are hydrocarbons like methane, propane, butane etc. They comes under organic chemistry. All other compounds other than hydrocarbons and their derivatives are inorganic.
Hence, the research work on natural gas comes in organic chemistry thus, option A is correct.
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One of the compounds used to increase the octane rating of gasoline is toluene (pictured). Suppose 43.3 mL of toluene (d = 0.867 g/mL) is consumed when a sample of gasoline burns in air. How many grams of oxygen are needed for complete combustion of the toluene? (a) How many grams of oxygen are needed for complete combustion of the toluene? g (b) How many total moles of gaseous products form? mol (c) How many molecules of water vapor form?
Answer:
(A)
Density = Mass / Volume
So
Mass = Density × Volume
[tex]= 0.867 g/mL \times 43.3mL = 37.5411 g Toluene[/tex]
[tex]1C_6 H_5 CH_3 + 9 O_2 > 7 CO_2 + 4 H_2 O[/tex]
Mole ratio of toluene : Oxygen is 1 : 9
[tex]$37.5411 g \text { Toluene } \times \frac{1 \text {mol} \text {toluene}}{92 g \text { toluene}} \times \frac{9 {mol} O_{2}}{1 \text {mol} \text { toluene }} \times \frac{32 g O_{2}}{1 {mol} O_{2}}=117 g O_{2}(\text {Answer})$[/tex]
(B)
1 mole of Toluene produces 7 moles of [tex]CO_2[/tex] gas and 4 moles of [tex]H_2 O[/tex] Vapour
So the mole ratio is 1 : 11
[tex]37.5411 g Toluene $\times \frac{1 \text { mol toluene }}{92 g \text { toluene }} \times \frac{11 \mathrm{mol} \text { gas }}{1 \text { mol toluene }} $$\\\\=4.49 \text { mol gaseous products (Answer) } $[/tex]
(C)
1mole contains [tex]6.022\times10^{23}[/tex] molecules
[tex]37.5411 g Toluene $\times \frac{1 \text { mol toluene }}{92 g \text { toluene}} \times \frac{4 \mathrm{mol} \mathrm{H}_{2} \mathrm{O}}{1 \mathrm{mol} \text { toluene }} \times \frac{6.022 \times 10^{23} \text { molecules } \mathrm{H}_{2} \mathrm{O}}{1 \mathrm{mol} \mathrm{H}_{2} \mathrm{O}} $\\\\$=9.82 \times 10^{23} \text { molecules } \mathrm{H}_{2} \mathrm{O} \text { (Answer) } $[/tex]
A. The mass of oxygen needed for complete combustion of the toluene is 117.52 g.
B. The total mole of gaseous products formed is 4.488 moles
C. The number of molecules of water vapor formed is 9.82×10²³ molecules
We'll begin by calculating the mass of toluene. This can be obtained as follow:
Volume = 43.3 mL
Density = 0.867 g/mL
Mass of toluene =?Mass = Density × Volume
Mass of toluene = 0.867 × 43.3
Mass of toluene = 37.5411 gNext, we shall write the balanced equation for the reaction. C₆H₅CH₃ + 9O₂ —> 7CO₂ + 4H₂ONext, we shall determine the masses of C₆H₅CH₃ and O₂ that reacted from the balanced equationC₆H₅CH₃ + 9O₂ —> 7CO₂ + 4H₂O
Molar mass of C₆H₅CH₃ = (6×12) + (1×5) + 12 + (3×1) = 92 g/mol
Mass of C₆H₅CH₃ from the balanced equation = 1 × 92 = 92 g
Molar mass of O₂ = 2 × 16 = 32 g/mol
Mass of O₂ from the balanced equation = 9 × 32 = 288 g
SUMMARY:
From the balanced equation above,
92 g of C₆H₅CH₃ reacted with 288 g of O₂
A. Determination of the mass of O₂ needed for the complete combustion of the toluene
From the balanced equation above,
92 g of C₆H₅CH₃ reacted with 288 g of O₂.
Therefore,
37.5411 g of C₆H₅CH₃ will react with = (37.5411 × 288)/92 = 117.52 g of O₂
Thus, 117.52 g of O₂ is needed for the reaction.
B. Determination of the total number of mole of the gaseous products formed
We'll begin by calculating the number of mole of in 37.5411 g of C₆H₅CH₃Molar mass of C₆H₅CH₃ = 92 g/mol
Mass of C₆H₅CH₃ = 37.5411 g
Mole of C₆H₅CH₃ =?Mole = mass / molar mass
Mole of C₆H₅CH₃ = 37.5411 / 92
Mole of C₆H₅CH₃ = 0.408 mole Next, we shall determine the mole of CO₂ produced.C₆H₅CH₃ + 9O₂ —> 7CO₂ + 4H₂O
From the balanced equation above,
1 mole of C₆H₅CH₃ produced 7 moles of CO₂
Therefore,
0.408 mole of C₆H₅CH₃ will produce = 0.408 × 7 = 2.856 moles of CO₂
Next, we shall determine the mole of H₂O produced.C₆H₅CH₃ + 9O₂ —> 7CO₂ + 4H₂O
From the balanced equation above,
1 mole of C₆H₅CH₃ produced 4 moles of H₂O
Therefore,
0.408 mole of C₆H₅CH₃ will produce = 0.408 × 4 = 1.632 moles of H₂O
Finally, we shall determine the total moles of the gaseous productsMole of CO₂ produced = 2.856 moles
Mole of H₂O produced = 1.632 moles
Total mole = 2.856 + 1.632
Total mole = 4.488 molesTherefore, the total number of mole of the gaseous products formed is 4.488 moles
C. Determination of the number of molecules of water vapor formed.
From Avogadro's hypothesis,
1 mole of water = 6.02×10²³ molecules
Therefore,
1.632 moles of water = 1.632 × 6.02×10²³
1.632 moles of water = 9.82×10²³ molecules
Thus, the number of molecules of water vapor formed is 9.82×10²³ molecules
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if on an average you inhale once every three seconds exactly how many times do you inhale in a 24 hour day
Answer:
28,800
Explanation:
First convert hours to minutes.
60 minutes in an hour so: 24 x 60 = 1,440 (mins)
Second convert minutes to seconds.
60 seconds in a minute so: 1,440 x 60 = 86,400
Divide 86,400 by three. For every three seconds, you inhale once; 3:1 ratio.
86,400/3 = 28,800
This gives us our final answer. You inhale approximately 28,800 times in a 24 hour day.
Convert 135 Meters to kilometers
Answer:
0.135 km
Explanation:
1 km = 1000 meters
Define inference and explain how it is used to form conclusions
What is the chemical equation for photosynthesis
Answer:
The Photosynthesis Equation. The photosynthesis equation is as follows: 6CO2 + 6H20 + (energy) → C6H12O6 + 6O2 . Hope this helps you! :)
Which event is most likely occurring?
Answer: effusion of gas particles
Answer:
The correct answer is "effusion".
Explanation:
In chemistry, effusion is defined as the movement of gas particles trough a small hole from an area to another. This event is what most likely is occurring in the figure, where the red dots inside the container represent gas particles, the green circle is a barrier and the white dot at the middle represent the small hole that the gas particles go trough during the effusion process.
Jim, Jane, Ann, and Bill measure an object's length, density, mass, and volume, respectively.
Which student's measurement might be in kilograms?
Final answer:
Jim, who measures mass, may use kilograms, an appropriate unit for objects with considerable mass like textbooks. Smaller items, like bananas, would be measured in grams, while milligrams are used for very tiny masses in scientific settings.
Explanation:
The student whose measurement might be in kilograms is Jim, who measures mass. Kilograms are the appropriate unit for measuring objects with considerable mass, such as textbooks or humans. For example, a textbook has a mass of about a kilogram. In contrast, grams would be more suitable for measuring smaller objects like a banana, since a banana's mass is typically around 120 grams - far less than a kilogram. Milligrams are even smaller units, which would not be practical for everyday objects as they are usually used to measure tiny quantities, as might be done by scientists in a lab. In learning environments, balances or scales are used to measure mass, which can range from small milligrams up to a few kilograms.
To choose the appropriate tool for following measurements: 1. The volume of a water balloon would be measured using a measuring cup or another volumetric tool. 2. The length of a basketball court would be measured using a measuring tape or a laser distance meter. 3. The weight of an apple is most conveniently measured using a kitchen scale, which would likely display in grams. 4. The volume of a milk carton could be indicated on the carton but could also be measured using a graduated cylinder or measuring jug.
Write a balanced chemical equation for the reaction of copper(II) sulfate and concentrated ammonia to produce teramine copper(II) sulfate.
The balanced chemical equation is CuSO4 + 4NH3 -> [Cu(NH3)4]SO4.
Explanation:The balanced chemical equation for the reaction of copper(II) sulfate and concentrated ammonia to produce teramine copper(II) sulfate is:
CuSO4 + 4NH3 → [Cu(NH3)4]SO4
In this reaction, copper(II) sulfate (CuSO4) reacts with concentrated ammonia (NH3) to produce teramine copper(II) sulfate. The reaction forms a complex compound with the coordination number of copper changed from 2 to 4.
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Macy always thought there were only a few hair colors:blond,brown,and black. However,when she actually began looking around, she saw varying shades of these hair colors. What is a possible reason for so many different hair colors
Final answer:
There is a multitude of hair colors due to variations in melanin (eumelanin and pheomelanin) which are produced by melanocytes. These variations are genetically determined and influenced by multiple genes, resulting in a broad spectrum of hair shades.
Explanation:
The reason for the many different hair colors we see is primarily due to the pigmentation of hair follicles caused by two types of melanin: eumelanin and pheomelanin. The presence of more eumelanin leads to darker hair, while less eumelanin results in lighter hair. The levels and ratios of these pigments can change over time, which can cause a person's hair color to change. Furthermore, hair color can also vary between individuals due to the diverse genetic factors that determine the type and quantity of melanin produced by melanocytes. Hair color is an example of a polygenic trait, meaning it's controlled by multiple genes, such as MC1R, TYR, TYRP1, SLC24A5, and KITLG. Instead of being a simple black, brown, or blond, hair color encompasses a wide spectrum that can include various shades and hues, influenced by genetic variability and genetic penetration.
Which property could be used to identify an unknown substance?
By using Physical properties unknown substance can be identified as it involves determination of a substance with out changing their composition or property include color, odor, taste, density, melting point etc.
What are the difference between physical and chemical property ?Chemical properties can be observed or measured when a substance undergoes any type of changes chemically while Physical properties can be observed without changing anything.
In chemical property, chemical reaction is conducted to show the property of the substance while in physical property No chemical reaction occur.
Chemical properties related to chemical bonds while Physical properties do not have such a relationship.
Chemical properties include radioactivity, toxicity, flammability, heat of combustion, etc. while physical properties include Molecular weight, boiling point, melting point, freezing point, volume, mass, length, density shape, solubility, etc.
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Final answer:
Chemists identify unknown substances by observing and measuring their physical and chemical properties, such as color, mass, and melting point, and comparing them to known values or by noting the chemical changes that they undergo.
Explanation:
To identify an unknown substance, chemists use various properties that can be observed or measured. Among these properties are physical properties like color, state (solid, liquid, or gas), mass (which is related to weight), and texture. Then there are chemical properties which can be discerned through chemical changes that the substance undergoes to produce new matter, as in the case of rust formation from iron, oxygen, and water. To determine if the substance is organic or inorganic, scientists may look for the presence or absence of carbon-based compounds.
Specific laboratory techniques like measuring the melting point can also be used to identify substances. By comparing the melting point of an unknown to literature values, and perhaps mixing a sample with a known substance and retesting, accurate identification can be achieved. If the melting point remains sharp and similar to the literature values, the unknown is likely correctly identified.
In a practical scenario using available lab equipment, such as a laser or ray box and a reference guide of optical properties, a substance's refractive index or how it bends light, might be used for identification. Therefore, physical and chemical properties serve as the basis for identifying unknown substances in chemistry.
how many significant figures are in the measurement 40,500 mg?
a) two
b) three
c) four
d) five
b) three
this is because all integers are sig figs, and all numbers between integers are sig figs. This makes the 40,5 part of 40,500 significant. Place holder zeroes that are not after a decimal are not significant, so the last two zeroes of the number are not significant.
The correct option to the question is option (b).
To find:
Number of significant figures = ?
Significant figures are defined as the figures that are present in a number. It expresses the magnitude of a quantity to a specific degree of accuracy.
Some rules to detect the significant figures in a number are as follows:
All digits ranging from 1 to 9 are always considered significant.Every non-zero number is always considered significant.All zero’s that are present between the integers is always considered significant.All zero’s preceding the first integer is never considered significant.All zeros that are present after the decimal point are always significant.It is evident from the given measurement that the digits '4', '0', and '5' are only significant and the last two zeroes do not have any significance.
Thus, the correct option is option (b).
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All gases listed are at the same pressure. Which gas will most closely approach ideal behaviour?
A ammonia at 100K
B ammonia at 500K
C neon at 100K
D neon at 500K
tell me the answer and explain well
Neon at 500K (Option D) will most closely approach ideal behavior because at this high temperature, its weak dispersion forces are easily overcome, allowing it to behave more like an ideal gas.
Explanation:The key to determining which gas most closely approaches ideal behavior is to consider both the intermolecular forces and the conditions of temperature and pressure. Real gases deviate from ideal behavior under conditions of high pressure and low temperature because these conditions allow the volume and intermolecular forces of the gas particles to no longer be negligible. Therefore, a gas will behave more ideally at higher temperatures and lower pressures, where the kinetic energy of the gas particles is high enough to overcome intermolecular attractions.
In this case, even though all gases are at the same pressure, the temperature is different. Ammonia is a polar molecule with stronger intermolecular forces, specifically hydrogen bonding. In contrast, neon is a noble gas with very weak dispersion forces due to its non-polarity and small atomic size. Given the choices, neon at 500K (Option D) will most closely exhibit ideal behavior because the high temperature would provide sufficient kinetic energy to overcome the already weak dispersion forces between its atoms.
Do changes that cannot be easily reversed, such as burning,
observe the law of conservation of mass?
Explain.
Answer:
Yes. Burning usually observes this kind of law.
Explanation:
The law of conversion of mass states that mass can never be formed nor can it be eradicated. This means that in case of burning, the amount of matter before and after will remain to be the same. It doesn't change at all.In conclusion, there's no form of change that can be able to affect matter.How do you write the compound Mg3N2? Are Roman numerals included as well?
Answer:
It is written exactly like that; Mg3N2
Explanation:
Roman numerals are used sometimes to show the charge of an ion that can be multiple charges.
The compound Mg3N2 is magnesium nitride, a binary ionic compound without Roman numerals in its formula; Roman numerals are used for metals with variable charges, not for those like magnesium with a fixed charge.
Explanation:The compound Mg3N2 is known as magnesium nitride, which is a binary ionic compound. When writing chemical formulas for such compounds, you write the metal ion with its charge, followed by the nonmetal ion with its charge. Magnesium has a charge of +2 and nitrogen has a charge of -3. However, no Roman numerals are included in the formula Mg3N2 because magnesium has a fixed oxidation state of +2 and does not require indicating its charge through Roman numerals, unlike transition metals with variable charges. Roman numerals are used when naming ionic compounds of cations with variable charges such as iron in iron(II) chloride or iron(III) oxide.
Describe an experiment that could further explore physical or chemical change.
The experiment titled "Investigating the Chemical Reaction between Baking Soda and Vinegar" explores the chemical change that occurs when baking soda (sodium bicarbonate) reacts with vinegar (acetic acid).
The experiment with physical or chemical changeThe objective is to observe the production of carbon dioxide gas and understand the resulting reaction. A balloon filled with baking soda is placed over a container of vinegar, and the baking soda is allowed to mix with the vinegar.
This causes a chemical reaction to take place, leading to the release of carbon dioxide gas. The balloon inflates due to the gas, and observations are made regarding the appearance, sounds, and size changes of the balloon.
The experiment demonstrates that the reaction between baking soda and vinegar creates new substances, indicating a chemical change. The experiment offers a hands-on way to learn about chemical reactions and their outcomes.
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Which of the following forces can make a ball move?
A- A balanced force
B- An unbalanced force
C- Equal and opposite forces along a horizontal plane
D- Equal and opposite forces along a vertical plane
Answer:
The answer for this question would be B- An unbalanced force
Answer:
the answer is b
Explanation: I'm guessing
12. Why do scientists believe there could be life on Titan?
Answer:
Whether there is life on Titan, the largest moon of Saturn, is at present an open question and a topic of scientific assessment and research. Titan is far colder than Earth, and its surface lacks stable liquid water, factors which have led some scientists to consider life there unlikely.
Explanation:
Pretend you are an uncooked egg; now describe what happened to you when you were placed in a pot of boiling water. Be sure to include the following in your response: energy, molecules, and chemical change.
Answer:The molecules in a raw egg absorb the heat energy, they use this energy to change shape
Such a chemical reaction is said to be endergonic, which means 'energy in'.
Egg molecules will never undergo these reactions without the input of energy (usually in the form of heat)
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Give the number of significant figures: 0.01101 cm
Answer:
4 significant figures
Explanation:
The zero after decimal is not significant figure.
Which of the following is an example of a Chemical reaction that you've seen in your everyday life?
Salt dissolving
Ice melting
Water freezing
Fire burning
Answer:
The answer Is fire burning, because the wood being burned is changing to carbon
Answer:
fire burning
After recording the data for five repeated trials you should calculate the average of five values and report that average in your lab report
Answer:
The statement given is true.
Explanation:
When we conduct an experiment we have to record the outcomes and maintain a log so that we can know number for later purposes, where the experiment is going and what conclusions we can expect.
To get the final answer or number the five outcomes that have been recorded here have to be averaged to get one value, this value would show where the outcome’s value will lie.
If you added 15,000 calories to 2.0 L of water that was at 25.0 degrees C, what temperature would it be at when you finished?
Answer:
When we finish, the temperature would be 32.5℃
Explanation:
Density of water = mass/volume
So,
Mass of water = Density × Volume
[tex]\\\\$=1.0 \times 2.0 L$\\\\$=1.0 \frac{g}{m L} \times 2000 m L$\\\\$\quad=2000 g$[/tex]
[tex]$Q=m \times c \times \Delta T$[/tex]
where
[tex]\Delta T[/tex] = Final T - Initial T
Q is the heat energy in calories
c is the specific heat capacity (for water 1.0 cal/(g℃))
m is the mass of water
plugging in the values
[tex]$15000 \mathrm{Cal}=2000 \mathrm{g} \times 1.0 \frac{\mathrm{cal}}{\mathrm{g}^{\circ} \mathrm{C}} \times \Delta T$[/tex]
[tex]\\$\Delta T=\frac{15000 \mathrm{cal}}{2000 \mathrm{g} \times \frac{1.0 \mathrm{cal}}{g^{\circ} \mathrm{C}}}$\\\\$\Delta T=7.5^{\circ} \mathrm{C}$[/tex]
Final T = ∆T + Initial T
= 7.5℃ + 25℃ = 32.5℃ (Answer).
If an object is than water, it will float. If it is than water, it will sink.
Answer: you should realize that if an object weighs more than an equal volume of water, it is more dense and will sink, and if it weighs less than an equal volume of water, it is less dense and will float. Remember that the density of water is about 1 g/cm3.
Explanation:
1) less dense
2) more dense
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what do dots represent in a electron dot diagram and what does the amount of dots tell us about each atom
Dots in a Lewis electron dot diagram represent valence electrons of an atom, and the number of dots indicates the atom's valence electrons. This visual tool helps predict chemical bonding capabilities. For ions, cations show fewer dots and anions have more compared to their neutral atoms.
In a Lewis electron dot diagram, dots are utilized to symbolize the valence electrons of an atom. These dots are arrayed around the symbol of the element and indicate how many electrons are found in the outermost shell of the atom, which are available for chemical bonding. The amount of dots provides insight into the atom's reactivity, with each dot representing a potential for bond formation.
For instance, the Lewis electron dot diagram for hydrogen is depicted with a single dot, as hydrogen has one valence electron. Conversely, a Lewis electron dot diagram for an oxygen atom will show six dots around the oxygen symbol, reflecting its six valence electrons. Moreover, in the case of ions, a cation (positively charged ion) will exhibit fewer dots than its neutral atom counterpart, whereas an anion (negatively charged ion) will display additional dots.
Which of the following statements is true?
Sound waves create areas of high and low pressure.
Areas of high pressure are called compressions.
Areas of low pressure are called rarefactions.
All of the above.
Answer:
c
Explanation:
Answer:
A
Explanation:
Oxygen and nitrogen are both gases at room temperature. Explain why oxygen has a greater force of attraction between its particles than nitrogen. (Room temperature is 20°C) please help
Answer:
Explanation:
Oxygen molecules and Nitrogen molecules forms in a very similar way. The attraction between particles of oxygen is great due to its very high electronegativity value. Oxygen has a higher electronegative value compared to nitrogen.
Electronegativity of an atom is the relative tendency with which atoms of an element attracts valence electrons in a chemical bond. Valence electrons are used in forming chemical bonds. They can be transferred from one atom to the other or they can be shared.
Oxygen is the second most electronegative atom on the periodic table. To form a bond, it shares the valence electrons in order for its octet to be complete. Pull for the valence electrons between the contributing atoms is very strong due to their large electronegative values. This pull is stronger compared to that between nitrogen atoms.
Final answer:
Oxygen molecules have greater intermolecular forces than nitrogen due to magnetic interactions from unpaired electrons (paramagnetism) and oxygen's higher electronegativity.
Explanation:
The force of attraction between oxygen (O₂) molecules is greater than that between nitrogen (N₂) molecules due to the nature of intermolecular forces at play. Oxygen molecules have two unpaired electrons in their outer orbitals, which facilitates the formation of weak magnetic interactions between them known as paramagnetism. These paramagnetic forces add to the usual London dispersion forces contributing to a stronger overall attractive force compared to nitrogen, which does not exhibit this magnetic property due to its paired electrons. Furthermore, oxygen's slightly higher electronegativity may also enhance these attractive forces compared to nitrogen.
what does the word atomos mean and why is it not an accurate name
He named the atom after the Greek word atomos, which means 'that which can't be split.'
The word 'atomos' means 'indivisible' in Ancient Greek, but modern science has shown that atoms can be divided into smaller subatomic particles. Despite this, the term 'atom' is still used today.
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How does good preparation help you stay safe when conducting a science experiment?
Answer:
The answer is B
Explanation:
The answer B talks about precautions, which you would have to know if you want to be safe during a science experiment, so I believe that is the best option.
Hope this helps brother :-)
what is the density of a 10 kg mass of water when 1 kg mass of water has a density of 1 g/cm3
Answer:
The same density is an intrinsic property. A property that that does not depend on the amount.
Explanation:
The density of this 10 kg mass of water is [tex]10 \;g/cm^3[/tex]
Let the first water be A.Let the second water be B.Given the following data:
Mass of A = 10 kgMass of B = 1 kgDensity of B = [tex]1 \;g/cm^3[/tex]To find the density of A;
First of all, we would find the volume for this density.
[tex]Volume = \frac{Mass}{Density}\\\\Volume = \frac{1}{1}\\\\Volume = 1 \;cm^3[/tex]
Now, we can find the density of A;
[tex]Density = \frac{10}{1}[/tex]
Density of A = [tex]10 \;g/cm^3[/tex]
Therefore, the density of this 10 kg mass of water is [tex]10 \;g/cm^3[/tex]
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The term "precision" BEST refers to which of the following?
A) whether or not a measurement is correct
B) how “close together” a seat of measurements is
C) whether or not a tool for making measurements is useful
D) how close a measurement is to an accepted value for measurement
Answer:
A.
Explanation:
the term precision refers to something that is has the most quality or good condition, being precise and exact.
Answer: The answer is B
Explanation:
This is because precision refers to how close two or more measurements are to each other.