Answers
Onions make you cry due to a chemical process that occurs when they are cut. The broken cells react to produce a gas which reaches your eyes and stimulates tear production.
Explanation:The reason onions make you cry is because of a chemical process that occurs when we cut into them. Onions contain substances known as sulphoxides. When an onion is cut, the cells are broken open and react with the sulfenic acids to produce a volatile sulphur compound called propanethial S-oxide. This gas diffuses through the air and eventually reaches your eyes, where it reacts with the water to form a diluted sulfuric acid. This burning sensation triggers the eyes to produce tears to flush out the irritant.
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Related Questions
What is the value for ΔS°reaction for the following reaction, given the standard entropy values
C6H12O6(s) + 6O2(g) —->6CO2(g) + 6H2O(l)
+131 j/k
-131 j/k
+262j/k
-262 j/k
+417j/k
Answers
[tex] S^{0} (C6H12O6) [/tex] = 212.1 J/K.mol
[tex] S^{0} (O2) [/tex] = 205.0 J/K.mol
[tex] S^{0} (CO2) [/tex] = 213.6 J/K.mol
[tex] S^{0} (H2O) [/tex] = 69.9 J/K.mol
Now for the reaction:
C6H12O6(s) + 6O2(g) —->6CO2(g) + 6H2O(l)
ΔS°reaction = ∑[tex] S^{0} products [/tex] - ∑[tex] S^{0} reactants [/tex]
∴ ΔS°reaction =( 6 [tex] S^{0} (CO2) [/tex] + 6 [tex] S^{0} (H2O) [/tex] ) - ([tex] S^{0} (C6H12O6) [/tex] + 6 [tex] S^{0} (O2) [/tex] = 205.0 J/K.mol)
∴ ΔS°reaction = [6 (213.6) + 6 (69.9 )] - [(212.1) + 6(205.0)]
∴ ΔS°reaction = 258.9 ≈ 262 J/ K mol.
Thus, correct answer is option C
Molar mass:
C6H12O6212.1 J/K.mol
O2= 205.0 J/K.mol
CO2 = 213.6 J/K.mol
H2O= 69.9 J/K.mol
THE BALANCE IS:
C6H12O6(s) + 6O2(g) —->6CO2(g) + 6H2O(l)
= [6 (213.6) + 6 (69.9 )] - [(212.1) + 6(205.0)]
= 258.9
=262 J/ K mol.
Determine y for the following equation: log(9/8)=y
Answers
So solving for y in log(9/8)=y is just an evaluation of log(9/8).
Either
[tex]y=log_{10}(9/8)=0.05115[/tex] to 5 decimals, or
[tex]y=log_{e}(9/8)=0.11778[/tex] to 5 decimals
depending the context of the question.
What are the subatomic particles of an atom
Answers
Answer:
Explanation:
Subatomic particles are the structures of matter that are smaller than the atom, and that are part of it and determine its properties. These particles can be of two types: compound and elementary, that is, divisible (composed of other subatomic particles) and indivisible respectively.
The atom is made up of three stable particles: electron, proton and neutron and these particles are in turn composed of others, still smaller. So, currently the existence of the following subatomic particles is known, in addition to the three previously mentioned:
Boson Positron Fermion Neutrino Hadron Lepton Quark MesonDue to their low stability and size, these particles are very difficult to study and discover.
Jimmer is playing basketball. After 24 seconds, the shot clock goes off and he loses the ball. This happens every time he gets the ball because he refuses to pass or shoot. Which of the following statements is true?
Jimmer is on a fixed-interval schedule of reinforcement.
Jimmer is on a variable-interval schedule of reinforcement.
Jimmer is on a fixed-ratio schedule of reinforcement.
Jimmer is on a variable-ratio schedule of reinforcement.
Answers
Answer:
The answer is A- Jimmer is on a fixed-interval schedule of reinforcement.
Explanation:
Final answer:
Jimmer is on a fixed interval reinforcement schedule, as he loses the ball every 24 seconds, which is a predictable and set amount of time after he initially gets possession.
Explanation:
Jimmer, in the scenario provided, loses the ball after 24 seconds each time he gets the ball because he refuses to pass or shoot, thus triggering the shot clock.
Jimmer is on fixed interval reinforcement schedule.
This is because his behavior (holding onto the ball) is being 'rewarded' with the loss of the ball at a predictable and set amount of time after he first acquires it, which is every 24 seconds.
A fixed interval schedule of reinforcement is when reinforcement is received after a certain fixed period of time has passed, as opposed to variable interval schedules where the period of time varies, and the ratio schedules where reinforcement is based on the number of responses rather than the passage of time.
Balance the following: ___ AlBr3+ ___ K---> ___KBr+ ___ Al
Answers
1 AlBr3 + 3K -> 3KBr + 1 Al
hope this helps............
With all his gear Noel Armstrong weighed almost 360 pounds on earth when he landed on the moon he weighed 60 pounds why
Answers
Noel Armstrong weighed almost 360 pounds on Earth but when he landed on the Moon, he weighed 60 pounds. This is because the gravity on the Moon is lesser than the gravity on the Earth.
Hope this helps.
Answer: C.
The gravity on the Moon is less than the gravity on Earth.
Explanation: plato :3
NaCl, I2, HCl, KF what kind of bond are they?
Answers
NaCl - ionic
I2 - covalent
HCl - covalent
KF - ionic
Final answer:
NaCl, I2, HCl, and KF have different types of bonds: NaCl and KF have ionic bonds, while I2 and HCl have covalent bonds.
Explanation:
The compounds NaCl, I2, HCl, and KF have different types of bonds.
NaCl, sodium chloride, has an ionic bond. In an ionic bond, one atom donates electrons to another atom to form ions with opposite charges.
I2, iodine, has a covalent bond. In a covalent bond, atoms share electrons to fill their valence shells.
HCl, hydrogen chloride, also has a covalent bond.
KF, potassium fluoride, has an ionic bond. The metal atom donates electrons to the non-metal atom.
please help!
A pea plant with round seeds (Rr) is crossbred with another pea plant with wrinkled seeds (rr). What is the probability of offspring having wrinkled seeds?
A) 0%
B) 25%
C)50%
D)75%
Answers
Rr, Rr, rr and rr
which is two for each in four possible outcomes bringing the ratio to 1:1
which is equivalent to 1/2
so 1/2 as a percentage is
=1/2*100
=50%
So the parents are Rr and rr
so r would be the recessive
and R is the dominant
Let's cross them:
Rr x rr
=Rr Rr rr rr
Rr =50%
rr=%
So the probablity of a wrinkled seed offspring would be 50% (rr).
across a period, how does the electronegativity of a nonmetal affect the acidity of its binary hydride
Answers
2) Consider 3rd period elements containing non-metal i.e Si, P, S and Cl.
3) Here, atomic radius of these elements are in following order Si>P>S>Cl.
4) However, electronegative of these elements increases as we move from left to right
5) Thus, the corresponding hydrides have higher electro-negativity difference,as one moves from left to right.
6) Due to this, bond polarity increases from left to right,
7) Increase in bond polarity, results in increasing proton donating capability.
8) Therefore, acidity increases as one moves along the period.
How many double bonds are in an alkane?
Answers
Alkanes only have single bonds
Alkanes are hydrocarbons with only single bonds between the carbon atoms, therefore, they do not contain any double bonds.
Explanation:In chemistry, an alkane is a type of hydrocarbon where all of the carbon-carbon bonds are single bonds, meaning they share just one pair of electrons. Double bonds share two pairs of electrons and are typically found in alkenes, a different type of hydrocarbon. Therefore, an alkane does not have any double bonds.
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A bottle contains 6.23 g of copper turnings. The mass of a length of magnesium ribbon is 6.23 g. Are there more copper atoms or more magnesium atoms present?
Answers
Molar mass of copper = 63.5 g/mol
Molar mass of magnesium = 24.3 g/mol
Moles of copper = 6.23 g / 63.5 g/mol = 0.098 mol
Moles of magnesium = 6.23 g / 24.3 g/mol = 0.256 mol
according to the Avogadro constant,
1 mol = 6.022 x 10²³
Hence,
atoms of copper = 0.098 x 6.022 x 10²³ = 5.902 x 10²²
atoms of magnesium = 0.256 x 6.022 x 10²³ = 15.416 10²²
Hence magnesium ribbon has more atoms.
PLEASE HELP! 94 POINTS AND BRAINLIST PLZ PLZ
04.04 Using the Periodic Table Assignment
You are an Intergalactic CSI that investigates crime scenes between galaxies!
There has been a nuclear explosion on another planet.
Your mission is to match the forensic evidence from the scene to our Earth’s Periodic Table.
Let’s make sure that you have all the atomic information that you will need!
Part 1: Mission Preparation: Use the following word bank to complete the sentences accurately.
atomic mass protons column electrons atomic number neutrons row 11 12 23
A. The _______________ ___________________ of an element includes atomic number plus the number of neutrons.
B. The atomic number represents the number of _____________________ and ___________________ in an element.
C. Elements found in the same_____________________ have similar chemical properties.
D. An element with an atomic number of 11 and an atomic mass of 23 will have __________ neutrons total.
Part 2: Mission Activated
Use information you have learned to help you match the Galactic Element Clues to our Earth elements found in the Periodic Table below.
When you find a match, please type the galactic symbols (letter abbreviation) in the periodic table below, next to Earth’s element symbol.
Periodic Table
Group 1 Group 2 Group 13 Group 14 Group 15 Group 16 Group 17 Group 18
1
H/Gs
1.008
2
He/
4.003
3
Li/
7.941 4
Be/
9.012 5
B/
10.811 6
C
12.010 7
N/At
14.006 8
O/
15.999 9
F/
18.998 10
Ne/
20.179
11
Na/So
22.989 12
Mg/
24.305 13
Al/Lm
26.981 14
Si/
28.085 15
P/
30.973 16
S/
32.065 17
Cl/Ms
35.453 18
Ar/
39.948
19
K/
39.098 20
Ca/
40.078 Skip
21 - 30 31
Ga/
69.723 32
Ge/
72.64 33
As/
74.921 34
Se/
78.96 35
Br/
79.904 36
Kr/
83.8
Answers
A. atomic mass
B. protons and electrons
C. column
D. 12
sorry I don't know about part 2
There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Therefore, the blanks can be filled as below.
What is periodic table?Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.
Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet.
A. The atomic mass of an element includes atomic number plus the number of neutrons.
B. The atomic number represents the number of protons and electrons in an element.
C. Elements found in the same column have similar chemical properties.
D. An element with an atomic number of 11 and an atomic mass of 23 will have 12 neutrons total.
Therefore, the blanks can be filled as above.
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The gaia hypothesis is an example of
Answers
The Gaia Hypothesis is an example of negative feedback.
how many atoms of each element are needed to create an ionic compound of strontium selenide
Answers
Calculate the ionic charges on both atoms:
As Strontium belongs to Group-II in periodic table so it will tend to loose two electrons and form Sr⁺² , i.e.
Sr → Sr⁺² + 2 e⁻
While, Se belonging to Group-VI will tend to gain two electrons and form Se⁻², i.e.
Se + 2 e⁻ → Se⁻²
Step 2:
Multiply the coefficient of each element by the charge of other element.
Se⁻² × 2 = 2 Se⁻² ∴ where 2 is charge on Sr
And,
Sr⁺² × 2 = 2 Sr⁺² ∴ where 2 is charge on Se
So, the formula comes out to be,
Sr₂Se₂
Or divide both coefficients by 2 to have a simplest form. i.e...
SrSe
Result:
One One atoms of each element are needed to create an ionic compound of Strontium Selenide.
Calculate the answer. Express it in scientific notation and make sure it has the correct number of significant figures. (2.45 x 1013) x (4.00 x 1012) = _____
Answers
(2.45 x 10^13) x (4.00 x 10^12) = 9.8 x 10^25
Hope this helps!
a mid-ocean ridge forms at what type of plate boundary
Answers
Answer:
a mid ocean ridge or mid oceanic ridge is an underwater mountain range formed by plate tectonics. this uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma.
A mid-ocean ridge forms at a divergent plate boundary, where tectonic plates move apart and create new seafloor through a process known as seafloor spreading.
Explanation:A mid-ocean ridge typically forms at what's known as a divergent plate boundary. This is a location where two tectonic plates are moving away from each other, leading to the creation of new seafloor. As the plates diverge, magma from the Earth's mantle rises to fill the gap, and cools to form new crust. This process, known as seafloor spreading, results in the formation of mid-ocean ridges - undersea mountain ranges that are, collectively, the longest mountain range on our planet.
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We have an object with a density of 620 g/ cm3 and a volume of 75 cm3. What is the mass of this object?
Answers
D=620 g/cm³
V=75 cm³
m= 620 g/cm³ * 75 cm³=46500 g
m=46500g
Justine took a sip of milk and immediately spat it out because she realized it had soured.
Which path did messages in her nervous system follow to cause this reaction?
sensory neurons → sensory receptors → motor neurons → interneurons
sensory receptors → sensory neurons → interneurons → motor neurons
motor receptors → interneurons → sensory neurons → sensory receptors
sensory receptor → interneurons → Sensory neuron → motor neurons
Answers
Sensory Receptor is that part of the nervous system that responds to stimuli
Sensory Neuron is that type of neuron that carries messages from special receptors to the central nervous system
Interneuron is the type of neuron that connects sensory and motor neurons
Motor Neuron is the type of neuron that carries messages from the central nervous system to effectors
Zinc metal reacts with oxygen to form solid zinc(II) oxide, write a balance equation for this reaction
Answers
2Zn + O2 ---› 2ZnO (Balanced)
The chemical equation needs to be balanced so that it follows the law of conservation of mass.
★The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations.★
"A balanced chemical equation occurs when the number of the different atoms of elements in the reactants side is equal to that of the products side."
Zinc metal reacts with oxygen to form solid zinc(II) oxide, The balanced equation is 2Zn + O₂ → 2Zn₂⁺+ 2O₂⁻ .
What is zinc metal ?With the atomic number 30 and the symbol Zn, zinc is a chemical element. When the oxidation is removed, zinc transforms into a shiny-greyish metal that is slightly brittle at normal temperature. It is the first element in the periodic table's group 12 of elements.
A chemical combines with oxygen to form its oxide during combustion, which generates heat and light. Metals produced when metal oxides react with oxygen. Zinc oxide is created by the combustion of zinc, as illustrated below: 2Zn+O2→2ZnO.
This reaction is a combination reaction, which is the type of chemical reaction it is. Balanced Approaches: We have zinc and oxygen gas in this reaction of combination, and they mix to make zinc oxide.
Thus, zinc metal reacts with oxygen to form solid zinc(II) oxide, The balanced equation is 2Zn + O₂ → 2Zn₂⁺+ 2O₂⁻ .
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an experimental container has volume of 13000 L has an internal pressure of 1.38 atm. if the pressure inside the container becomes 250 atm, what would the new volume have to be ? assume all other properties remain constant ?
Answers
The new volume is 71.76 L
calculation
The new volume is calculated using the Boyle's law formula
that is P1V1=P2V2 where,
P1=1.38 atm
V1= 13000 L
P2 =250 atm
V2= ?
make V2 the subject of the formula by diving both side by P2
V2= P1V1/ P2
v2=( 1.38 atm x 13000 L) / 250 atm = 71.76 L
Acceleration involves a change in __________.
Answers
If one cubic centimeter of lead has a mass of 11.3 grams, what is its density? A.11.3 g/cm3
B.11.3 cm/g3
C.11.3 N
D.11.3 cm3/g
Answers
[tex]p = \frac{m}{v} [/tex]
p is density
m is mass
v is volume
so the answer will be 11.3 g/cm3
good luck
Since,
[tex]p = m \div v[/tex]
Where P= Density
m=Mass
v= Volume
It's unit will be dividing mass standard unit by volume standard unit.
[tex]g \div {cm}^{3} [/tex]
So your answer is A.
[tex]11.3g \div {cm}^{3} [/tex]
What is the concentration of a HF solution with a PH of 2.3
Answers
[H⁺] = 5.011 × 10⁻³ mol.L⁻¹
Explanation:
The pH is converted into concentration of H⁺ as,
[H⁺] = 10^-pH
Where 10 is antilog,
So, putting values,
[H⁺] = 10⁻²·³
[H⁺] = 0.00501
Or,
[H⁺] = 5.011 × 10⁻³ mol.L⁻¹
When determining the motion of the planets in the solar system what is a good reference point to use
Answers
Genetic engineering can be applied to many fields, including medicine and agriculture. Which of the following is a medical application of genetic engineering?
A.
analyzing a person's DNA to see how closely they are related to another person
B.
inserting genes into bacteria so that they will produce a needed medicine
C.
giving crop plants recombinant DNA so that they will be resistant to herbicides
D.
examining a person's pedigree to determine whether they carry a gene for a genetic disease
ANSWER IS B
Answers
Final answer:
Genetic engineering in medicine includes inserting genes into bacteria to produce needed medicines, using recombinant DNA technology. This innovation allows for the mass production of medical substances like insulin, hormones, and antibiotics. So the correct option is B.
Explanation:
Genetic engineering has a wide array of applications in various fields, including medicine and agriculture. One medical application of genetic engineering, as identified by option B, involves inserting genes into bacteria to produce medicine. This process is known as recombinant DNA technology, where genes are isolated, and then inserted into other organisms, like bacteria, which can then be grown in culture to produce useful substances like insulin, hormones, and antibiotics. Such methodologies have revolutionized the production of medicines, making previously scarce treatments widely available.
In the context of genetic engineering applications in agriculture, genomics can be used to improve crop yields, increase disease resistance, and generate new hybrid strains. However, the question specifically asked for a medical application, distinguishing it from agricultural uses.
HOW MANY HYDROGEN ATOMS IN AN ACYCLIC ALKANE WITH 12 CARBON ATOMS
Answers
[tex]C_{n}H_{2n+2}, when n=12, 2n+2=2*12+2=26 C_{12}H_{26} 26 Hydrogen atoms.[/tex]
An acyclic alkane with 12 carbon atoms will contain 26 hydrogen atoms, as determined by the formula for noncyclic alkanes, CnH2n+2. Alkanes consist of carbon and hydrogen atoms, and the number of carbon atoms in an alkane can vary widely.
Explanation:The number of hydrogen atoms in an acyclic alkane with 12 carbon atoms can be found using the general formula for noncyclic alkanes, which is CnH2n+2. Here, 'n' represents the number of carbon atoms. Thus, if an acyclic alkane has 12 carbon atoms, you can substitute 12 into the formula to get: C12H2(12)+2 = C12H26. This means that an acyclic alkane with 12 carbon atoms will contain 26 hydrogen atoms.
All alkanes are composed of carbon and hydrogen atoms, and have similar bonds, structures, and formulas; noncyclic alkanes follow the formula of CnH2n+2. The number of carbon atoms present in an alkane has no limit. Greater numbers of atoms in the molecules lead to stronger intermolecular attractions (dispersion forces) and correspondingly different physical properties of the molecules.
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(3 Points)
Which statement correctly compares radio waves and microwaves?
A. Radio waves have a higher frequency than microwaves.
B. Radio waves have shorter wavelengths than microwaves.
C. Radio waves have lower radiant energy than microwaves.
D. Only radio waves are used in communication.
Answers
Final answer:
Radio waves have lower frequency and longer wavelengths than microwaves, which means they also have lower radiant energy. Thus, the correct statement comparing these two types of electromagnetic waves is that radio waves have lower radiant energy than microwaves. So the correct option is C.
Explanation:
The question asks to compare radio waves and microwaves in terms of their characteristics within the electromagnetic spectrum. Radio waves have longer wavelengths and lower frequencies compared to microwaves. Among the options provided, the correct statement would be that radio waves have lower radiant energy than microwaves since energy in electromagnetic waves increases with frequency and decreases with wavelength. Both radio waves and microwaves are used in various communication technologies, so the statement that only radio waves are used in communication is incorrect.
A sample of gas at 301 Kelvin and 1.5 atmospheres has a density of 3.90 g/L. What is the molar mass of this gas? Show all of the work used to solve this problem.
Answers
(1.5 atm)(1 L) = (n)(.08206)(301K)
n = .06 moles in one liter
If there are 3.9 grams in .06 moles then
1/.06 x 3.9 = 64.2 grams per mol
Answer:
Molar mass of the gas is 64.3 g/mol
Explanation:
Given:
Temperature of gas, T = 301 K
Pressure of gas, P = 1.5 atm
Density of gas, D = 3.90 g/L
To determine:
The molar mass, M of the gas
Explanation
Based on the ideal gas equation
[tex]PV = nRT[/tex]
where P = pressure, V = volume ; R = gas constant, T = temperature
n = moles of the gas
[tex]n = \frac{mass(m)}{molar\ mass(M)}[/tex]
substituting for n in the ideal gas equation:
[tex]PV = \frac{m}{M} *RT\\\\M = (\frac{m}{V})*\frac{RT}{P} \\\\density , d = \frac{mass(m)}{Volume(V)} \\\\Therefore:\\\\M = d*\frac{RT}{P} = 3.90 g/L *\frac{.0821Latm/mol-K*301K}{1.5atm} =64.3 g/mol[/tex]
Which statement is true about the Milky Way? It is a big planet. It contains the universe. It has an irregular shape. It has several billion stars.
Answers
Answer "The correct option is "It has several billion stars"
Explanation :
Milky way is the name of the galaxy in which our solar system is present. The name is given because of its appearance. This galaxy has a spiral shape when seen from outer universe and looks like a disk when viewed from earth.
The milky way is one of the galaxies in the universe and contains several billion stars.
The option "It is a big planet""is not correct because we know that it contains billions of stars and plants and not just one big planet.
The options "It contains the universe" is not correct because it is one of the galaxies present in the universe.
The option "It has an irregular shape" because we know that it has a definite spiral shape.
Therefore the only option that is correct is "It has several billion stars"
Will mark as Brainliest.
What type of reaction will occur if ∆H is negative and there are no significant entropy effects?
acid-base reaction
redox reaction
endothermic reaction
spontaneous reaction
Answers
Final answer:
When ΔH is negative and entropy effects are negligible, the reaction is likely spontaneous because it is exothermic and releases heat, contributing to a negative Gibbs free energy which predicts spontaneity.
Explanation:
If a reaction has a negative ΔH (delta H), and there are no significant entropy effects, meaning the change in entropy (δS) is not large enough to influence the reaction significantly, the reaction is likely to be spontaneous. This is because a negative ΔH indicates that the reaction is exothermic, which means it releases heat. In the absence of significant entropy effects, the exothermic nature of the reaction would drive it towards spontaneity as per Gibbs free energy (ΔG = ΔH - TΔS), which would be negative when ΔH is negative and ΔS is negligible or positive.