Here, naphthalene is being burned in a water-filled bomb calorimeter.
What is Combustion?
Combustion is a chemical reaction between a fuel and an oxidizer in which heat, light, and other products of combustion are released. The most common type of combustion is the burning of hydrocarbon fuels, such as natural gas or gasoline, to produce carbon dioxide and water vapor as the main products.
Heat of combustion = [mass of water x specific heat capacity x (final temperature - initial temperature)] / (mass of naphthalene)
Heat of combustion = (650 g x 4.185 J/g∙°C x 6.4°C) / (0.5 g)
Heat of combustion = 16,914 J/g
Heat of combustion = 16,914 J/g x (1 mol/128 g)
Heat of combustion = 131.5 kJ/mol
Hence, the heat of combustion is 131.5 kJ/mol.
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PLS HELP!!!!
The potential energy of the reactants is about
100 kJ
40 kJ
20 kJ
60 kJ
A and B are the reactants and the potiential energy is 40kj
just read from the graph
|||Good points and Brainliest||| Explain the biological pump
(have at least 3 sentences pls)
Answer:
The biological pump or the marine carbon pump is the title for multiple processes leading to separation of carbon from multiple sources of water. Biological pumping is partially responsible for the cycling of organic matter. This process can lead to loss of contact between carbon and the atmosphere for thousands of years.
Hope this helped!
A food worker needs to
measure the temperature of
cold-held potato salad.
Where should she check the
temperature?
If a food service employee has to check the temperature of cold potato salad, she should do so at multiple places throughout the salad
If the dish is maintained between 40 and 140 degrees Fahrenheit, potato salad can be consumed around two hours after cooking. A nice approach to keep salad fresh for a long time is to refrigerate it at 40 F. Before reaching 140 F, the hot salad can be reheated.
Addition than potatoes, the salad ingredients may contain other ingredients with varying rates of cooling. Therefore, it is necessary to take temperature readings of the potato salad at various locations.
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The complete question is-
A food worker needs to measure the temperature of cold-held potato salad where should she check the temperature
A. On the surface of the salad
B. Along the side of the salad dish
C. In multiple places throughout the salad
D. On the temperature gauge of the holding equipment
1. Do you believe we can bring an end to acid rain? How so?
2. What are some examples of land pollution?
Answer:
Emissions from Electricity. ...
Vehicle Emissions. ...
Reducing Electricity Consumption. ...
Reducing On-Road Vehicle Exhaust. ...
Other Considerations.
What room in a house is similar to the chloroplasts in a cell
Before we use our imaginations to try and think of a fitting room, let's take a look at what a chloroplast is.
A chloroplast is the organelle in plant-based cells responsible for energy production. Through photosynthesis (you've probably heard of this before!), they use sunlight to create energy for the plant to function.
Since the chloroplast is the energy-maker for the cell, we need to imagine a room in a house that does something like this. There's a couple things that come to my mind. Firstly, although they don't really count as rooms, something like solar panels would probably make the most sense here. Since the answer asks for a room, though, solar panels don't work.
Maybe a kitchen? The kitchen is the room where food is created, supplying energy to all the inhabitants of a house.
I hope this helped! Learning about the components of cells is a little complicated at the start, but it's definitely a very exciting topic that only gets more and more interesting the deeper you delve into it.
- breezy ツ
S(s)+3F2(g)->SF6(g) how many mol of F2 are required to react completely with 2.30 mol of S?
Answer: There are 6.9 mol of [tex]F_{2}[/tex] are required to react completely with 2.30 mol of S.
Explanation:
The given reaction equation is as follows.
[tex]S(s) + 3F_{2}(g) \rightarrow SF_{6}(g)[/tex]
Here, 1 mole of S is reaction with 3 moles of [tex]F_{2}[/tex] which means 1 mole of S requires 3 moles of [tex]F_{2}[/tex].
Therefore, moles of [tex]F_{2}[/tex] required to react completely with 2.30 moles S are calculated as follows.
[tex]1 mol S = 3 mol F_{2}\\2.30 mol S = 3 mol F_{2} \times 2.30 \\= 6.9 mol F_{2}[/tex]
Thus, we can conclude that there are 6.9 mol of [tex]F_{2}[/tex] are required to react completely with 2.30 mol of S.
how many moles of iron (iii) oxide is needed to produce 2 moles of oxegen
Read the labels of several commercial products and identify monatomic ions of at least four transition elements contained in the products. Write the complete electron configurations of these cations
As stated in the preceding statement [Zn²⁺] = 1s²2s²2p⁶3s²3p⁶3d¹⁰, [Fe3+] = 1s²2s²2p⁶3s²3p⁶3d⁵, [Fe²⁺] = 1s²2s²2p⁶3s²3p⁶3d⁶, [Cd²⁺] = 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰
What is the straightforward meaning of element?Denotes to a basic material that isn't divided into smaller components or transformed into another chemical in chemistry. An atom, which is made up of protons, neutrons, and particles, is really the fundamental unit of an element. An element's atoms all equal the number of protons.
Dietary supplements include Zn²⁺ ions:
[Zn²⁺] = 1s²2s²2p⁶3s²3p⁶3d¹⁰
Mineral water contains Fe³⁺ cations:
[Fe3+] = 1s²2s²2p⁶3s²3p⁶3d⁵
Food supplements may include Fe²⁺ cations:
[Fe²⁺] = 1s²2s²2p⁶3s²3p⁶3d⁶
Paints had Cd²⁺ ions in them:
[Cd²⁺] = 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰
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The complete question is-
Read the labels of several commercial products and identify monatomic ions of at least four transition elements contained in the products. Write the complete electron configuration of these cations. Make sure to clearly identify which monatomic ions is found in which commercial product.
Graph the system on a separate sheet of paper and determine the number of solutions it has one solution If it has one
determine its coordinates.
2x + 3y = 12
2x - y = 4
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Three Chemistry students find a bottle of colorless liquid in the laboratory and each makes a different suggestions about the identity of its contents.
Josh: I think it is a reducing agent.
Matthew: I think it is an oxidizing agent.
Ricchard: I think it is neither a reducing agent nor an oxidizing agent.
Answer:
and the question is?
Explanation:
Solve the following equation for X. Remember to balance the equation. Xe + 2F2 -> X In the above question we see the reaction between Xe and fluorine gas F2. Interestingly, Xenon has a high affinity for oxygen, and xenon fluorides are known to undergo hydrolysis to give the hydrohalic acid and the rare gas oxide similar to the following equation: XeF6 + 3H2O -> X + 6HF
xenon fluorides are known to undergo hydrolysis to give the hydrohalic acid and the rare gas oxide similar to the following equation: XeF6 + 3H2O -> XeO3 + 6HF.
A noble gas compound with the formula XeF6 is xenon hexafluoride. It is one of xenon's three binary fluorides, along with XeF2 and XeF4. All known are exergonic and stable at normal temperatures. The series' strongest fluorinating agent is XeF6.Water's chemical formula is H2O, which means that each of its molecules consists of two hydrogen atoms and one oxygen atom. In its +6 oxidation state, xenon can form the unstable chemical xenon trioxide(XeO3). It is an extremely potent oxidizing agent that slowly releases oxygen from water, a process that is sped up by sunshine. When it comes into touch with organic materials, it explodes dangerously. It emits xenon and oxygen gas when it explodes.
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How many moles of H3PO4 form from 9 mol P4O10
According to the given chemical equation and stoichiometry of it , 36 moles of H₃PO₄ are formed from 9 moles of P₄O₁₀.
What is stoichiometry?It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.
As per the reaction, 1 mole of P₄O₁₀ produces 4 moles of H₃PO₄, thus 9 moles of P₄O₁₀ will produce 9×4=36 moles of H₃PO₄.
Thus,36 moles of H₃PO₄ are formed from 9 moles of P₄O₁₀.
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Answer:36
Explanation:
taking the class just got it right
Which best describes the velocity of a person on a merry-go-round? * 1 point zero constant increasing continuously changing
Answer:
continuously changing
Explanation:
The velocity of a person on a merry-go-round can best be described as continuously changing. This is because the initial velocity before the ride starts would be 0. Once the ride begins, it keeps going faster and faster until it reaches a certain speed. During this time the velocity is increasing. Then it remains constant for a certain period of time and when the ride is over the velocity and speed begins to decrease until ultimately reaching a speed of 0. Therefore, it is continuously changing throughout the duration of the ride.
what is the conservation of mass pertains the chemical change and physical change?
Answer:
Hey mate......
Explanation:
This is ur answer......
The Law of Conservation of MassMatter can change form through physical and chemical changes, but through any of these changes, matter is conserved. The same amount of matter exists before and after the change—none is created or destroyed. This concept is called the Law of Conservation of Mass.
The Law of Conservation of Matter also states that the matter cannot be created or destroyed. In a physical change, substances can change form, but the total mass remains the same. In a chemical change, the total mass of the reactants always equals the total mass of the products.
Hope it helps!
Brainliest pls!
Follow me! :)
Answer:
The Law of Conservation of Matter states that matter cannot be created or destroyed. In a physical change, substances can change form, but the total mass remains the same. In a chemical change, the total mass of the reactants always equals the total mass of the products.
Explanation:
1. An organ which receive the waste product carried by the blood.
4. It is a gas that the body needs.
6. It is a combination of hemoglobin and oxygen that enters the body.
7. The respiratory and digestive work as it absorbed
that being
distributed through the body.
10. The system responsible for digestion of food
Down:
2. The ability to maintain a relatively stable internal state that persist despite
changes in the world outside,
3. The respiratory and circulatory work together by exchanging of
5. The signal that circulatory system carries that control the speed of digestion.
8. The system responsible of exchange of gases
9. The system carries nutrients to the entire body cells.
1. Kidney receive the waste product carried by the blood.
2. Homeostasis is the ability to maintain a relatively stable internal state that persist despite changes in the world outside.
3. The respiratory system and circulatory system work together by exchanging of oxygen and carbon dioxide.
4. Oxygen is a gas that the body needs.
5. Chemical signals are carried out by circulatory system that control the speed of digestion.
6. Oxyhemoglobin is a combination of hemoglobin and oxygen that enters in the body.
7. The respiratory system and digestive system work as it absorbed oxygen that being distributed through the body.
8. The respiratory system is responsible for exchange of gases.
9. The circulatory system carries nutrients to the entire body cells.
10. The digestive system is responsible for food digestion.
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show the shape and appearance of the arrangement of atoms in a compound.
When sand and water are mixed in a beaker, the sand is mixed into the water. However, if you stop stirring, the sand will settle down to the bottom. This mixture is a
a
solution
b
suspension
c
colloid
d
solute
How many neutrons are in an atom of nitrogen-14?
There are 7 neutrons in an atom of nitrogen-14.
Nitrogen-14 is primarily an isotope of nitrogen, as is well known. We can also describe it as a neutral atom. Additionally, various isotopes typically have a variable ratio of neutrons to protons.
As is common knowledge, an atom's atomic number represents the total number of protons that make up its nucleus. We are informed that nitrogen has a mass number of 14, and we are also aware that nitrogen has an atomic number of 7.
It is discovered that the atomic number and the number of protons are same. This demonstrates that the nucleus of any atom that is an isotope of nitrogen will in general have seven protons.
Additionally, the number of electrons equals the amount of protons. The number of electrons will therefore be 7, we can say. We shall now determine how many neutrons are there. As is well known, mass is equal to the sum of the protons and neutrons. As a result, there will be = 14 - 7 = 7 neutrons.
As a result, we may say that nitrogen-14 has 7 electrons, 7 protons, and 7 neutrons and that it is neither an anion nor a cation. It's an impartial atom.
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Calculate the mass in grams of 4.96 mol of titanium (Ti).
Ribose is an important sugar with a molar mass of 150.15 g/mol and an empirical formula of CH2O. What is the molecular formula
Ribose is an important sugar with a molar mass of 150.15 g/mol and an empirical formula of CH₂O . Its molecular formula is C₅H₁₀O₅
A molecular formula is defined as the exact number of different atoms present in the molecule of a compound. On the other hand, an empirical formula is defined as the simplest whole number ratio of the different atoms present in a molecule of a compound.
Given here,
molar mass of ribose sugar = 150.15 g/mol
empirical formula = CH₂O
To find: molecular formula
empirical formula mass of ribose sugar
= (12+ 1×2+ 16) g/mol
= 30 g/mol
molar mass/ empirical formula mass
= 150.15 gmol⁻¹ / 30 gmol⁻¹
=5.005
≈5
we know that
molecular formula
= molar mass/ empirical formula mass × empirical formula
=5 ×CH₂O
= C₅H₁₀O₅
Thus, the molecular formula is C₅H₁₀O₅
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An oxygen-binding protein was purified from a mollusk. It was found to exhibit fluorescence, which means that it has amino acid residues that absorb light of one wavelength and then emit light of a longer wavelength. Generally, the more exposed these residues are to solvent, the greater their fluorescence intensity. When placed in a deoxygenated buffer solution, the protein's fluorescence was measured and assigned a value of 1.0. Then the amount of protein fluorescence was measured under various other conditions and expressed relative to the initial measurement. The results are summarized in the table. Which conclusion is supported by these results
The conclusion is supported by these results is binding of oxygen to the protein changes the protein's tertiary structure to a conformation that resists the effects of urea.
Simple definition of fluorescenceFluorescence is a property that some chemicals have that allows them to emit visible light after absorbing radiation that is typically invisible, like ultraviolet light.
Fluorescence is the name given to the process of electromagnetic radiation typically visible light emitting from a material as a result of atoms being excited. These excited atoms almost immediately (within 10⁻⁸ seconds) begin emitting again. In most cases, the initial excitation is brought on by the energy absorption of incident radiation or particles, like X-rays or electrons.
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How many liters are present in 10 grams of H2O ?
Answer:
About 0.01
Explanation:
1 grams of H2O = 0.0010
0.0010 x 10 = 0.01
Determine the number of atoms of each element in the following: 4Al(OH)3
symbol
aluminium - Al 4
oxygen- o 12
hydrogen- H 12
How is Ethyl Butyrate and Isovaleric Acid DIfferent?
Ethyl butyrate have one oxygen is an Aldehyde and isovaleric Acid have two oxygen is an carboxylic acid
Ethyl Butyrate is an ester with a molecular formula of C₆H₁₂O₂ and Isovaleric Acid is a carboxylic acid with a molecular formula of C₅H₁₀O₂.
What is an ester?In chemistry, an ester can be described as a compound derived from an oxoacid in which at least one hydroxyl group (-OH) is replaced by an alkoxy group (-O-R), as in the substitution chemical reaction of a carboxylic acid and an alcohol. But the carboxylic acid contains a carboxyl group (C(=O)OH) attached to an R-group.
Glycerides can be defined as fatty acid esters of glycerol and are one of the main classes of lipids and comprise the bulk of vegetable oils and animal fats.
Esters can be derived from carboxylic acids and are more frequently IUPAC nomenclature used for esters, based on the name for the acid followed by the suffix "-oate".
The chemical formulas of organic esters generally take the form RCO₂R’, where R and R′ are usually the hydrocarbon parts of the carboxylic acid and the alcohol respectively.
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In the lab, chemist analyzed a sample of methanol and found that it was made of 6. 20 g of carbon, 4. 10 g of hydrogen, and 15. 90 g of oxygen. What is the percent composition of each element? Round each answer to the tenths place
The percentage composition of carbon is 19.37% and percentage of oxygen is 49.68% and percentage composition of hydrogen is 12.8%.
According to question,
6.20g of carbon, 4.10g of hydrogen and 15.90g of oxygen is present in total sample of methanol.
Total mass of methanol is=mass of carbon x 1+ mass of oxygen x 1+mass of hydrogen x 4
Total mass= 12x1+16x1+1x4
Total mass=32g
Now, to find the percentage composition of each element use the total mass and given mass of element.
The ratio of the amounts of each element to the sum of the individual element amounts present in the compound, multiplied by 100, is the definition of the percentage composition of a given compound. In this instance, the quantity is expressed in gram of the constituent ingredients.
Percentage composition[tex]=\frac{mass of an element}{total mass}*100[/tex]
Percentage composition of carbon=[tex]\frac{6.20}{32} *100[/tex]
On solving we get,
Percentage composition of carbon=19.37%
Percentage composition of oxygen=[tex]\frac{15.90}{32}*100[/tex]
On solving we get,
Percentage composition of oxygen=49.68%
Percentage composition of hydrogen=[tex]\frac{4.10}{32}*100[/tex]
On solving we get,
Percentage composition of hydrogen=12.8%
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Two additional compounds were studied: NO2(OH) dissolved in water and produced an acidic solution, and Ni(OH)2 dissolved only in an acidic solution. What type of compounds were these
NO2(OH) dissolved in water is an example of an acidic salt.
Acidic salts are formed when a strong acid and a weak base react together. They are acidic in solution because they dissociate to form H+ ions and an anion. In this case, the acidic salt is NO2(OH), which when dissolved in water, dissociates to form H+ ions and OH- ions, resulting in an acidic solution.
Ni(OH)2 dissolved only in an acidic solution is an example of a basic salt.
Basic salts are formed when a strong base and a weak acid react together. They are basic in solution because they dissociate to form hydroxide ions (OH-). In this case, the basic salt is Ni(OH)2, which when dissolved only in an acidic solution will dissociate to form Ni2+ ions and OH- ions resulting in a basic solution.
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What is the exact molar mass of aspartame?
Aspartame, C14H18N2O5, has a molar mass of 294.307 grams/mol. As a result, the molecular weight of aspartame (C14H18N2O5) is equal to the molecular weights of 14 carbon atoms, 18 hydrogen atoms, 2, nitrogen atoms, and 5, oxygen atoms. As a result, aspartame (C14H18N2O5) has a molecular weight of 294.307 g/mol.
You can quickly determine the molar mass of aspartame if you have a periodic table nearby (C14H18N2O5), because combining the molar masses of the constituent atoms yields the molar mass of any molecule (or compound). Aspartic acid is known by the IUPAC name 2-Aminobutanoic acid, and its chemical formula is HOOCCH (NH 2) CH 2 COOH.
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the reaction between strontium hydroxide and chloric acid produces __________.
Pls answer. Braniest answer will be picked.
[tex] \huge\mathrm{ \boxed{A} \boxed{n}\boxed{s}\boxed{w}\boxed{e}\boxed{r}}[/tex]
The Correct option is C.)
Above diagram shows how Sodium and Chlorine forms an Ionic bond.
[tex] \mathrm{2Na + Cl_2 \rightarrow2NaCl }[/tex]
_____________________________
[tex]\mathrm{ \#TeeNForeveR}[/tex]
Paper chromatography is a process used to separate mixtures of substances into their components. The components are carried by a mobile phase through a stationary phase made of absorbent paper. An investigation analyzed a sample of black ink to determine its components.Which property allows the components to separate
Because of its simplicity, comparatively low cost, great sensitivity, and rapid separation, TLC is an extensively used analytical method.
Using a thin stationary phase supported by an inert backing, thin layer chromatography (TLC) is a chromatographic technique used to separate the components of a mixture. It can be carried out on an analytical scale to track the development of a reaction or on a preparative scale to purify minute quantities of a chemical. Similar to all chromatography, TLC works on the premise that a chemical will have varying affinities for the mobile and stationary phases, which will influence how quickly it migrates. TLC aims to produce well-defined, well-separated spots.
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