Answer:
The onion cells have a cell wall and the cheek cells do not.
Answer:
The onion cells have a cell wall and the cheek cells do not.
a gas is placed in a container with constant volume. it starts out with 4 kPa of pressure at a temperature of 127 C. If the pressure is decreased to 1 kPa, what is the final pressure
Answer:
31.75
Explanation:
p1/T1 = p2/T2
4/127 =1/X
X= 127/4 = 31.75kpa
Using the Periodic Table, Which of the following has the largest atomic radius/size?
So
Ti
О а
Ob
Ос
Od
Y
Zr
Answer:
vp jokhimon vf dpp gl fl vk hggjuvg7vvohohohohojj
Can a) H2 b) O) c) He d) Ar e) CO2 be used to lift a balloon?
Answer:
I am thinking h2 is answer
what is the bulk density of a dry soil sample with a
mass of 30 g that complely occupies a cylinder 6cm high and 4 cm in
diameter?
Answer:
397,570 g/m^3
Explanation:
The volume of the cylinder can be calculated using its height and diameter.
Mass of the soil sample (m) = 30 g
Height of the cylinder (h) = 6 cm
Diameter of the cylinder (d) = 4 cm
First, we need to calculate the radius (r) of the cylinder
Radius (r) = diameter / 2 = 4 cm / 2 = 2 cm = 0.02 m
Now, we can calculate the volume (V) of the cylinder
V = π * r^2 * h
V = 3.14159 * (0.02 m)^2 * 0.06 m
V = 7.5398 E-5 m^3
Calculate the bulk density (ρ) using this formula
ρ = m / V
ρ = 30 g / 7.5398 E-5 m^3
ρ = 397,887 g/m^3
What is the strongest force that exists between molecules of nitrogen
monoxide (NO)?
A. Hydrogen bonding
B. Van der Waals forces
C. lonic bonding
D. Dipole-dipole forces
Answer:
A
Explanation:
Cuz that's the answer for your question
explain why the boiling temperature of a two-component mixture rises slowly throughout a simple distillation when boiling point differences are not large. discuss the vapor liquid transitions that occur during this process.
Because the specific heats of the two fluids are so different, after one has finished condensing, the other has not quite hit its boiling point, which results in the temperature drop.
What degree temperature of heat is too much for people?People frequently cite a 2010 study that concluded that the highest limit of safety, above which the normal body is unable to cool itself by draining sweat from surface of the body, would be a moisture temperature of 35 C, or 95 F at 100% moisture, or 115 F at 50% humidity.
At what temperature can a person survive?The human body can withstand temperatures as low as 96 degrees Fahrenheit. The temperature at which the body remains to function at.
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Calculate the frequency and the energy of blue light that has a wavelength of 400 nm
(h= 6.62 x 1034 J-s).
Ans: v= 7.5 x 10¹4 Hz
E = 4.97 x 10-¹9 J
The frequency is 7.5 x 10¹⁴ Hz and the energy is 4.97 x 10⁻¹⁹ J of blue light that has a wavelength of 400 nm.
How does wavelength function? What is it?The length of the a wave is expressed by its wavelength. The wavelength is the distance between one wave's crest and the following wave's crest. The wavelength can also be determined by measuring from of the "trough" (bottom) with one waveform to the "trough" of the following wave.
Briefing:v = c/λ
v = 3.0 x 10⁸/4.0 x 10⁻⁷
v = 7.5 x 10¹⁴ Hz
400 nm = 4.0 x 10⁻⁷
E = hv
E = (6.63 x 10⁻³⁴)(7.5 x 10¹⁴)
E = 4.97 x 10⁻¹⁹ J
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How much energy is released (in kJ) in the fusion reaction of 2H
to yield 1 mol of 3He?
The atomic mass of 2H
is 2.0141 amu, and the atomic mass of 3He
is 3.0160 amu.
221H→32He+10n
The energy released in the fusion reaction of 2H to yield 1 mol of 3He is 1.4963 x 10⁻⁹ kJ/mol.
The energy that is released in the fusion reaction of 2H to yield 1 mol of 3He can be calculated using the difference between the masses of the reactants and products.
The mass difference can be converted to energy using Einstein's famous equation E=mc². Here is the step-by-step solution:
Step 1: Calculate the mass difference between the reactants and products.2H = 2.0141 amu3He = 3.0160 amu2H - 32He = 3.0160 amu - 2.0141 amu = 1.0019 amu
Step 2: Convert amu to grams.1 amu = 1.66 x 10⁻²⁴ g1.0019 amu x (1.66 x 10⁻²⁴ g/amu) = 1.663074 x 10⁻²⁴ g
Step 3: Calculate the mass of 1 mole of 3He.3He = 3.0160 g/mol
Step 4: Calculate the energy using
E=mc².E = (1.663074 x 10⁻²⁴ g) x (2.998 x 10⁸ m/s)²E
= 1.4963 x 10⁻⁶ J/mol1 kJ
= 1000 J1.4963 x 10⁻⁶ J/mol x (1 kJ/1000 J)
= 1.4963 x 10⁻⁹ kJ/mol
Therefore, the energy released in the fusion reaction of 2H to yield 1 mol of 3He is 1.4963 x 10⁻⁹ kJ/mol.
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What is the independent variable in this reaction
Answer:
Explanation:
what wheres the answer???
bromine vapour is heavier than air. even so, it spreads upwards in the experiment above. why?
Answer:
Bromine gas is heavier than air due to its atomic weight. Being heavier it still floats in the air due to diffusion and collision between the particles of bromine and air molecules. The particles collide with each other, so the two different gases can mix completely with each other.
Explanation:
T/F: prochirality center desrcibes an sp3 hybridized atom that can become a chirality center by changing one of its attached groups
False. A prochiral center does not describe an sp_3 hybridized atom that can become a chirality center by changing one of its attached groups.
A prochiral center is an atom that possesses chirality, meaning it can become a chirality center by changing its stereochemistry. However, the statement in question is incorrect because a prochiral center does not require changing one of its attached groups to become a chirality center.
In contrast, a prochiral center is a type of stereocenter that exhibits chirality due to the presence of two different groups attached to it. It becomes a chirality center when one of the groups is replaced by another group, resulting in the formation of two distinct stereoisomers.
An example of a prochiral center is a carbon atom with three different groups attached to it. Upon substitution of one of the groups, the prochiral center becomes a chirality center, giving rise to enantiomers.
Therefore, the statement that a prochiral center can become a chirality center by changing one of its attached groups is false.
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what are moles used to measure?
Answer:
mole, also spelled mol, in chemistry, a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles. The mole designates an extremely large number of units, 6.02214076 × 1023.
Explanation:
please mark my answer in brainlist
A 0. 200 L sample of neon gas at 270 K is cooled until the volume is 0. 180 L. What is the new temperature?
The new temperature will be 243 K.
We using the combined gas law to solve this problem, which relates the pressure, volume, and temperature of a gas;
(P₁ x V₁)/T₁ = (P₂ x V₂)/T₂
where; Initial pressure and temperature are P₁ and T₁, respectively.
V₁ will be the initial volume
The final pressure and temperature are P₂ and T₂.
V₂ will be the final volume
We are given the initial volume (V₁) as 0.200 L, the initial temperature (T₁) as 270 K, and the final volume (V₂) as 0.180 L. We need to find the final temperature (T₂).
The equation will be rearranged and solve for T₂;
T₂ = (P₂ x V₂ x T₁)/(P₁ x V₁)
The pressure is constant because the problem doesn't state any change in pressure, so we can cancel out the pressure terms from the equation.
T₂ = (V₂ x T₁)/V₁
T₂ = (0.180 L x 270 K)/0.200 L
T₂ = 243 K
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Summarize what collision theory says about solution formation. What is important to
remember about particle size and movement?
The frequency and energy of collisions between reactant molecules have an impact on the rate of a chemical reaction, according to collision theory.
The reactant particles must collide with enough energy during solution formation to overcome the attraction forces holding them together and create a new product. Important elements in this process are particle size and motion.
More collisions are possible due to the larger surface area that smaller particle sizes offer. The probability that faster-moving particles may collide with another particle with enough energy to start a successful reaction is also increased.
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state the colour universal indicator would turn in the oven cleaner.
We know that oven cleaners are basic in nature ranging pH from 11-13 and hence can change the universal indicator Blue or purple.
What is Universal indicator?An indication that may be used to determine whether a solution is acidic or basic is known as a universal indicator.It is a pH indicator made of a solution of several chemicals that displays multiple smooth colour changes over a broad pH range.While there are a number of universal pH indicators that are commercially available, Yamada's patented formula is used in the majority of them.Chemical Abstracts has information on this patent available. In the Journal of Chemical Education, experiments with Yamada's universal indicator are also covered.A universal indicator often contains the following ingredients: water, 1-propanol, phenolphthalein, sodium hydroxide, methyl red, bromothymol blue, sodium bisulfite, and thymol blue.An basic solution is one that is coloured blue or violet, while an acidic solution is one that is coloured yellow to red A solution that is coloured green .To learn more about universal indicator from the given link
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for the reaction: c8h18(l) 12.5 o2(g) → 8 co2(g) 9 h2o(l) a) how many grams of o2 are required to react with 1000 g of octane? (octane is the name of the carbon compound)
3,500 grams of O2 are required to react with 1000 grams of octane.
To answer this question, we need to use stoichiometry. First, we need to balance the equation:
C8H18(l) + 12.5 O2(g) → 8 CO2(g) + 9 H2O(l)
Now we can see that for every 12.5 moles of O2, we can produce 8 moles of CO2. We can use this ratio to find out how many moles of O2 are needed to react with 1 mole of octane:
12.5 mol O2 / 1 mol octane
To find out how many grams of O2 are needed to react with 1000 g of octane, we need to convert 1000 g of octane to moles:
1000 g octane x (1 mol octane / 114.23 g octane) = 8.75 mol octane
Now we can use the ratio above to find out how many moles of O2 are needed:
12.5 mol O2 / 1 mol octane x 8.75 mol octane = 109.4 mol O2
Finally, we can convert moles of O2 to grams:
109.4 mol O2 x (32.00 g O2 / 1 mol O2) = 3,500 g O2
Therefore, 3,500 grams of O2 are required to react with 1000 grams of octane.
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3,500 grams of O2 are required to react with 1000 g of octane.
To answer this question, we need to use stoichiometry to find the mole ratio of octane and oxygen and then use the molar mass of oxygen to calculate the mass of oxygen needed to react with 1000 g of octane.
The balanced chemical equation is:
C8H18(l) + 12.5 O2(g) → 8 CO2(g) + 9 H2O(l)
The mole ratio between octane and oxygen is 1:12.5, meaning that for every 1 mole of octane, we need 12.5 moles of oxygen to react completely.
To find the number of moles of octane in 1000 g, we need to divide the mass by the molar mass:
Number of moles octane = 1000 g / 114.23 g/mol = 8.75 mol
Using the mole ratio, we can calculate the number of moles of oxygen required:
Number of moles of o2 = 8.75 mol octane × 12.5 mol O2 / 1 mol octane = 109.38 mol O2
Finally, we can calculate the mass of oxygen needed using its molar mass:
Mass of oxygen = 109.38 mol O2 × 32.00 g/mol = 3,500 g
Therefore, 3,500 grams of O2 are required to react with 1000 g of octane.
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which correctly compares how adding energy affects a substance during a phase change?
A) Particles overcome forces of attraction and the temperature rises
B) Particles overcome forces of attraction and the temperature stays the same
The statement that correctly compares how adding energy affects a substance during a phase change is as follows: Particles overcome forces of attraction and the temperature rises (option A).
What is phase change?Phase change is a physical process in which a substance goes from one phase to another.
The change usually occurs when adding or removing heat at a particular temperature, known as the melting point or the boiling point of the substance.
This means that when energy is added to a substance (melting), the temperature rises and the particles overcome forces of attraction.
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Is an aqueous solution of NaHSO4 acidic, basic or neutral? Support your answer with a chemical equation. Hint: focus on HSO4- dissociation
An aqueous solution of sodium bisulfate (NaHSO4) is acidic. Sodium bisulfate dissociates in water to form the bisulfate ion (HSO4-) and the sodium ion (Na+). This reaction can be represented by the following chemical equation:
NaHSO4 (s) → Na+ (aq) + HSO4- (aq)
The bisulfate ion is a weak acid, and it dissociates further in water to form the sulfate ion (\(SO4^{2-}\)) and the hydrogen ion (H+):
HSO4- (aq) → H+ (aq) + SO42- (aq)
This additional dissociation of HSO4- increases the concentration of H+ ions in the solution, making the solution acidic. The presence of H+ ions in the solution means that the solution has a pH of less than 7, which is the definition of an acidic solution.
What is an aqueous solution?
An aqueous solution is a sort of mixture in which one or more solutes have been dissolved in water as the solvent. Any kind of material, including salts, acids, bases, and sugars, can serve as solutes. The word "aqueous" describes a solution's water content. These kinds of solutions are prevalent in biology and chemistry and are essential to numerous industrial and natural processes.
An aqueous solution is one in which water serves as the solvent. In chemical equations, it is often represented by adding to the appropriate chemical formula. For instance, Na⁺ + Cl⁻ might be used to depict a solution of table salt, or sodium chloride, in water.
Water, which makes up around 70% of the mass of the human body and is necessary for life, serves as the solvent in aqueous solutions.
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If the moon is full today what will it be in a month
Why is the condensation of water vapor considered to be a process which hads up the air? a. Water yapar must nbsorb energy in order to condense. b. Air cain hold thore water in the liquld phase that the vapor phase. c. Energy is released by water vapor as it condenses. d. Liquid water has a lower specific heat than water vapor. QUESTION 60 a. 42% b. 2+5% c 90% d. 3376
The correct answer to the first part of your question is option (c): Energy is released by water vapor as it condenses.
When water vapor condenses into liquid water, it undergoes a phase change from a gaseous state to a liquid state. During this phase change, energy is released in the form of latent heat. This release of energy occurs because the water molecules in the vapor phase are more energetic and have higher kinetic energy compared to the water molecules in the liquid phase.
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1. Which answer is a true statement about pH values?
a. A high pH value corresponds to a high H+ concentration
b. Stomach acid has a high pH value.
c. none of the above.
d. Pure water has a pH value of 0.
e. pH is important in life mainly because it effects many everyday applications.
2. The industrial smoke from factories has led to acid rain,which has lowered the pH of a number of lakes having a pH of approximately 5.0. What is the hydronium ion concentration of these lakes ?
a. 5.0 M
b. 10-5 M
c. 105 M
d. log 5.0 M
e. 5.0 %
1. A true statement about pH values is c. none of the above.
2. The hydronium ion concentration of these lakes is b. 10⁻⁵M
The true statement about pH valuesa. A high pH value actually corresponds to a low H+ concentration, as pH is the negative logarithm of the H+ concentration.
b. Stomach acid has a low pH value, typically around 2, which corresponds to a high H+ concentration.
d. Pure water has a pH value of 7, which is neutral.
e. While pH is important in many everyday applications, this statement is not specific enough to be considered a true statement about pH values.
The pH of a solution is the negative logarithm of the hydronium ion concentration. Therefore, if the pH of the lakes is 5.0, the hydronium ion concentration is 10-5 M because:
\([H+]= 10^{-pH}\)
\([H+]= 10^{-5}\)
\([H+]= 10^{-5}\)
Therefore, the hydronium ion concentration of the lakes is b. 10⁻⁵ M.
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pressures
of the three gases in the tank are 60.0 atm of O2, 2.0 atm of N2, and 17.0 atm of He,
how many moles of each gas are present inside of the tank?
7. If a steel container holds 3.00 atm of hydrogen gas and 3.50 atm of helium gas, and the
tatal nressure is 7.00 atm.. what is the partial pressure of Oxygen gas of the gases?
The partial pressure of oxygen gas (O₂) in the mixture is 0.50 atm.
Ideal Gas Law: PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is the temperature. Since the volume (V) and temperature (T) are constant, we can rearrange the equation to find n (moles) for each gas:
n = PV/RT
For your second question, we are given the total pressure (7.00 atm) and partial pressures of hydrogen gas (3.00 atm) and helium gas (3.50 atm). To find the partial pressure of oxygen gas, we can use the following equation:
Total pressure = P_H₂ + P_He + P_O₂
7.00 atm = 3.00 atm (H₂) + 3.50 atm (He) + P_O₂
Now we just need to solve for P_O₂:
7.00 atm - 3.00 atm - 3.50 atm = P_O₂
0.50 atm = P_O₂
So, the partial pressure of oxygen gas (O₂) in the mixture is 0.50 atm.
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When tin is added to copper, the resulting alloy (bronze) is much harder than copper. Explain.
When tin is added to copper, the resulting alloy (bronze) is much harder than copper because the large tin atoms accommodate the smaller copper atoms such that it becomes harder for these atoms to move. Therefore, such a crystal lattice is formed which becomes harder than the original element.
Bronze is an alloy made up of copper and tin elements mixed together. The copper is the major component whereas the tin occupies only 12-14% of the alloy. Alloying changes the physical, chemical and thermal properties such that the alloy becomes more durable, stronger and reliable.
Crystal lattice is the three-dimensional structure of any compound. It is the arrangement of all the atoms and elements in an ordered way.
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A glass sphere is filled to full volume with a gas. The pressure of the gas inside the sphere is 30.0 atm, and the temperature is 30.0°C. The sphere is taken outside on a cold day. The temperature of the gas decreases to 10.0°C. What is the new pressure of the gas? Assume that the volume is constant.
Answer:
28atm
Explanation:
Using Gay lussac's law equation as follows:
P1/T1 = P2/T2
Where;
P1 = initial pressure (atm)
T1 = initial temperature (K)
P2 = final pressure (atm)
T2 = final temperature (K)
Based on the information provided in this question;
P1 = 30.0 atm, T1 = 30.0°C, P2 = ?, T2 = 10.0°C
NOTE: Absolute temperature i.e. Kelvin is required for this law
T1 = 30°C + 273K = 303K
T2 = 10°C + 273K = 283K
Using P1/T1 = P2/T2
30/303 = P2/283
Cross multiply
P2 × 303 = 30 × 283
303P2 = 8490
P2 = 8490/303
P2 = 28.02
New pressure of the gas = 28atm
What is the difference in degrees Fahrenheit between the maximum expected temperatures by the end of the century between the lower and higher emissions scenario? Lower Emissions Scenario - Projected T
The difference in degrees Fahrenheit between the maximum expected temperatures by the end of the century between the lower and higher emissions scenarios can vary depending on various factors and assumptions.
However, in general, the lower emissions scenario is expected to result in a lower increase in global temperatures compared to the higher emissions scenario.
This means that the maximum expected temperature rise by the end of the century under the lower emissions scenario would be lower than that of the higher emissions scenario.
The specific temperature difference would depend on the specific projections and models used, but it highlights the significant impact that emissions reductions can have on mitigating future temperature increases.
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Which group of elements have a full octet of electrons ? Click 'View Image' to look at the periodic table. a) Noble gases b) Halogens c) Alkali metals d) Transition metals
The group of elements that have a full octet of electrons are the noble gases, which are located in group 18 of the periodic table. These elements include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).
Noble gases are chemically inert and do not easily form chemical bonds with other elements because their outermost energy level, or valence shell, is completely filled with electrons. This makes them stable and unreactive, which is why they are also known as inert gases.
On the other hand, halogens, alkali metals, and transition metals all have incomplete outer shells and are therefore more chemically reactive. Halogens have seven valence electrons and are one electron short of a full octet, while alkali metals have one valence electron and are one electron short of a full outer shell.
Transition metals, meanwhile, have varying numbers of valence electrons and do not follow a specific pattern in terms of electron configuration. In summary, the noble gases are the only group of elements that have a full octet of electrons, making them highly stable and unreactive.
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if you are correct you get a brainless
Tarek would like to germinate pumpkin seeds for his science project. He wraps the seeds in a dry paper towel and places them on the windowsill. Tarek waits, but the seeds will not grow. What conditions should Tarek have used to germinate the seeds? (2 points)
a
The paper towel should be wet, and the seeds should be placed in a dark place.
b
The dry paper towel should be placed in a pot filled with soil.
c
The paper towel should be dry and transparent.
d
The seeds should be placed in a dark place.
Answer:
A.
Explanation:
❤️
Answer: it’s A. The paper towel should be wet, and the seeds should be placed in a dark place.
Explanation: I hope this helps!
Question 13. Blocks of magnesium metal are often attached to the supports of drilling platforms in the ocean as "sacrificial electrodes". The magnesium protects the iron supports from corroding. Assuming that oxygen is being reduced by the following reaction: E +0.40 V 02(g)+ 2 H200)+ 4e4H (aą) Show, through standard cell potentials, why magnesium is oxidized instead of the iron supports
The standard cell potential is positive, the reaction is spontaneous and magnesium is oxidized instead of the iron supports, thus protecting the supports from corroding.
The half-reactions for the oxidation of magnesium and the reduction of oxygen are;
Mg(s) → Mg²⁺(aq) + 2e⁻ E° = -2.37 V
1/2O₂(g) + 2H⁺(aq) + 2e⁻ → H₂O(l) E° = +0.82 V
The overall reaction is;
Mg(s) + 1/2O₂(g) + 2H⁺(aq) → Mg²⁺(aq) + H₂O(l)
The standard cell potential (E°cell) for this reaction can be calculated using the equation;
E°cell = E°reduction + (-E°oxidation)
E°cell = +0.82 V + (-(-2.37 V))
= +3.19 V
Since the standard cell potential is positive, the reaction is spontaneous and magnesium is oxidized instead of the iron supports.
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what type of viscometer is used to measure the pvp viscosity?
The type of viscometer commonly used to measure the viscosity of PVP (polyvinylpyrrolidone) is a rotational viscometer.
This instrument works by measuring the torque required to rotate a spindle immersed in the liquid at a constant speed. The resulting viscosity value is then calculated using a mathematical formula based on the geometry of the spindle and the dimensions of the container holding the liquid.
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I need this ASAP no wrong answer please. (50) points and branliest
Which of the following is NOT true of DNA and RNA
1. DNA can leave the nucleus, RNA can't
2.DNA is double-stranded, RNA is single stranded
3.RNA has Uracil, DNA has Thymine
4. Both carry the genetic code
Answer: 1
Explanation:
DNA never leaves the nucleus
Answer:
1. DNA can leave the nucleus, RNA can't is the answer.
Explanation:
If a certain material is not permitted by these receptors to leave or enter the nucleus, it can’t. DNA is not among the materials that have the permission to leave and enter the nucleus. RNA, on the other hand, can leave and enter the nucleus to perform its functions, but this leaving and entering movements don’t occur without regulation.