What’s the molar mass of Lead-208
Why do onions make you cry?
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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A thickness of a material is a factor that affects heat conductivity. Does heat flow faster through a thick or a thin piece of the same material?
The surface area of a material is a factor that affects heat conductivity. Does heat flow faster through a large surface area or through a small surface area? Why? (Hint: Think about the number of particles available to bump into one another).
Change in temperature is a factor that affects heat conductivity. Will heat flow faster when there’s a large change in temperature or a small change in temperature?
Answer:
1. Heat flows faster through a thin material.
2. Heat flows through a large surface area.
3. Heat flows faster for a large change in temperature.
Explanation:
Thinking process:
Newton's law of cooling or heat transfer is given by the following equation:
[tex]Q= kA\delta T[/tex]
Where Q = Heat change (J)
A = area of hear transfer (m²)
[tex]\fdelta[/tex][tex]\delta T[/tex] = Change in temperature.
However, for a temperature difference across the wall having a thickness "x"and a constant surface area A, we get,
[tex]Q= k.A\frac{T_{1} - T_{2} }{x}[/tex]
Where x = thickness of the material
As we can see, increasing the thickness, x, decreases the heat flux
Increasing the area, A increases the heat flux
A big temperature increase, ΔT results in a large heat transfer.
Final answer:
Heat transfers more quickly through a thin material and with a larger contact surface area. Moreover, a greater temperature difference accelerates the rate of heat flow.
Explanation:
Heat conductivity is greatly influenced by three key factors:
Thickness of the material: Heat transfers more slowly through a thick material than through a thin one, because a thicker material requires more time for the heat to be conducted across by the series of molecular collisions. This is comparable to wearing thick clothing in winter for better insulation.Surface area: A larger surface area allows for more molecular collisions, therefore enhancing the rate of heat conduction. A greater contact area facilitates more efficient heat transfer through conduction.Temperature difference: The rate of heat flow increases with a larger temperature difference (T₂ - T₁) between two sides of the material. Greater difference in temperature drives a faster rate of molecular collisions and therefore a higher rate of heat transfer.In summary, the rate of heat transfer through a material is directly proportional to the temperature difference and surface area, while inversely proportional to the material's thickness.
(A)What type of cloud forms at high altitudes and is wispy and feathery.
A. Stratus
B. Altocumulus
C. Cumulus
D. Cirrus
(B) Why do clouds usually form high in the air instead of near the earths surface?
(C) What is the definition of precipitation
Answer:
Answer A)
Circus clouds are the highest of all clouds and made of ice crystal.
Circus clouds have no visible precipitation.
Answer B)
Because when the warm, moist air rises up and gets cool, water vapor condenses on tiny particles to form liquid water or ice crystal and form cloud.
Answer C)
Precipitation is a fall of moisture from the atmosphere in any form. it is an important input to hydrology.
Floods and droughts are directly related to precipitation.
Match the receptors with their motor responses?
Optic receptors get stimulations from vision by eyes.
A person stopping at a red traffic light due to
that person gets the vision signals by optic receptors.
Auditory
receptors are
stimulated by hearing sounds by ears.
A student giving an answer in response to a verbal
question is because of the auditory receptors.
Photoreceptors are stimulated
due to the light.
Example: a sunflower turns towards the light due to the photoreceptors.
Skin
receptors can
feel touch, temperature and pain.
Hence, a cat's fur rising when touched due to
the skin receptors.
what instrument us normally used to measure atmospheric pressure
How many atoms of copper will react with 33.9 L of nitrogen stp to produce copper nitride
Answer : The number of atoms of copper will be, [tex]54.67\times 10^{23}[/tex]
Solution :
As we know that 1 mole contains [tex]6.022\times 10^{23}[/tex] number of atoms
And,
At STP, 1 mole contains 22.4 liter volume of gas
First we have to calculate the moles of copper.
The balanced chemical reaction will be,
[tex]6Cu+N_2\rightarrow 2Cu_3N[/tex]
From the balanced chemical reaction we conclude that, 1 mole of nitrogen gas react with 6 moles of copper.
As, 22.4 L volume contains 6 moles of copper
So, 33.9 L volume contains [tex]\frac{6}{22.4}\times 33.9=9.08[/tex] moles of copper
Now we have to calculate the number of atoms of copper.
As, 1 mole of copper contains [tex]6.022\times 10^{23}[/tex] number of copper atoms
So, 9.08 moles of copper contains [tex]9.08\times (6.022\times 10^{23})=54.67\times 10^{23}[/tex] number of copper atoms
Therefore, the number of atoms of copper will be, [tex]54.67\times 10^{23}[/tex]
if you have 100g of a metal heated to 100° then dropped into 100g of water at 22° and the water temp increased to 35° does the metal release heat abosrb heat or stay the same
what acid and base form Ca3(PO4)2
The acid and base that formed the salt [tex]Ca_3(PO_4)_2[/tex] would be phosphoric acid ([tex]H _3PO _4[/tex]) and calcium hydroxide ([tex]Ca(OH)_2[/tex] respectively.
Formation of saltSalts are usually formed from neutralization reactions. That is, reactions involving acids and bases to produce salts and water.
In order to form [tex]Ca_3(PO_4)_2[/tex] from an acid and a base, such an acid must be phosphoric in nature while the base must be calcium-based.
Thus:
[tex]Ca(OH)_2 + H_3PO_4 --- > Ca_3(PO_4)_2 + H_2O[/tex]
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A 250-mL aqueous solution contains 1.56 10–5 g of methanol and has a density of 1.03 g/mL. What is the concentration in ppm?
In the alkane series of hydrocarbons, as the number of carbon atoms decreases, the normal boiling point ofthe compounds
The volume of a gas is doubled while the temperature is held constant. How does the gas pressure change
Answer: The new pressure will be half of the original pressure.
Explanation:
To calculate the pressure change, we use the equation given by Boyle's law. This law states that pressure is inversely proportional to the volume of the gas at constant temperature.
The equation given by this law is:
[tex]P_1V_1=P_2V_2[/tex]
where,
[tex]P_1\text{ and }V_1[/tex] are initial pressure and volume.
[tex]P_2\text{ and }V_2[/tex] are final pressure and volume.
We are given:
[tex]V_2=2V_1[/tex]
Putting values in above equation, we get:
[tex]P_1\times V_1=2V_1\times P_2\\\\P_2=\frac{P_1\times V_1}{2V_1}\\\\P_2=\frac{P_1}{2}[/tex]
Hence, the new pressure will be half of the original pressure.
what does the vsepr theory stand for
Answer:
why molecules have different shapes lol
Explanation:
Will mark as Brainliest.
For the balanced equation shown below, if 84.7 grams of H2S were reacted with 78.4 grams of O2, how many grams of H2O would be produced?
2H2S + 3O2 → 2SO2 + 2H2O
12.4 grams of water
24.9 grams of water
29.4 grams of water
Please explain your answer.
The plant structure that helps transport water and nutrients from the roots to the leaves and other parts of the plant is
The answerto your question is Xylem
what is the balance equation for HgO(s)- Hg(l)+O2(g)
Which of the following is a substance made up of only one type of atom?
Answer:
element
Explanation:
also you stole that answer off some other guy
Name the 5 types of chemical reactions
There are way more than 5 but I will list the ones I know:
Reaction with acid
Reaction with water
Combustion/Flammability
Combination
Redox
Isomerization
The five types of chemical reactions are acid-base reactions, exchange reactions, condensation reactions, cleavage reactions, and oxidation-reduction reactions. Examples of each type of reaction are provided.
Explanation:Most chemical reactions can be classified into one or more of five basic types: acid-base reactions, exchange reactions, condensation reactions (and the reverse, cleavage reactions), and oxidation-reduction reactions. Examples of each type of reaction include:
Acid-base reactions: When an acid reacts with a base to produce a salt and water. For example: HCl + NaOH → NaCl + H2OExchange reactions: When two compounds react to form new compounds by exchanging one or more atoms or ions. For example: AB + CD → AC + BDCondensation reactions: When two small molecules combine to form a larger molecule and also release a small molecule as a byproduct, such as water. For example: A + B → AB + small moleculeOxidation-reduction reactions: When there is a transfer of electrons between reactant species. For example: Fe2+ + Ce4+ → Fe3+ + Ce3+What group of elements has the most stable arrangement in their outer energy level?
why the element in periodic table which have more than three electron valens must plus ten in order to know the group in periodic table ?
Answer:-
If an element has 3 or more valence electrons then the element belongs to p block of the periodic table. For p block elements the group number is found out by adding the number of electrons in valence shell + 10.
The reason for this is because in the middle of the periodic table there are the d block elements ranging from group 3 to group 12 a total of 10 groups in between elements having 2 valence electrons and 3 valence electrons
Wildfires are _______.
a.
a human source of air pollution
b.
a natural source of air pollution
c.
both a natural and human source of air pollution
d.
none of the above
Answer:
c. both a natural and human source of air pollution
Explanation:
Wildfires can be produced both by humans (on purpose or not), and naturally (for example when a light strikes a tree).
The smoke produced (despite the origin of the wildfire) pollutes the surrounding air.
Which nonmetallic mineral is used as a building material and also in the manufacture of steel
Answer: limestone
Explanation:
How many grams of O2 can be prepared from 4.50g of KCIO3
The amount of O2 that can be prepared from 4.50 g of KCIO3 is calculated using stoichiometry. From the balanced chemical equation of the reaction, we find out that we can expect 1.008 grams of O2.
Explanation:The question asks about the amount of O2 that can be prepared from a certain amount of KCIO3. This is a chemistry question involving stoichiometry, which is a section of chemistry that deals with the quantitative relationships between reactants and products in a chemical reaction.
For this reaction, the balanced chemical equation is 2KCIO3 → 2KCl + 3O2. From this, we can see that from each mol of KCIO3, we can obtain 3/2 mol of O2. The molar mass of KCIO3 is approximately 214.55g/mol. So, 4.50g of KCIO3 equivalents to 4.50g/214.55g/mol = 0.021 mol. According to the balanced equation, these 0.021 mol of KCIO3 would produce 0.021 mol * 3/2 = 0.0315 mol of O2. Considering that the molar mass of O2 is 32.00 g/mol, the mass of O2 produced is 0.0315 mol * 32.00g/mol = 1.008g.
Therefore, the amount of O2 that can be prepared from 4.50 g of KCIO3 is approximately 1.008 grams of O2.
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1. Compare and Contrast microwaves with visible light using wavelength, frequency and energy. (3pts-1pt each for wavelength, frequency and energy)
Sodium bicarbonate is the chemical name for baking powder. Its chemical formula is NaHCO3. What does the subscript 3 mean?
There are three molecules of sodium bicarbonate.
There are three molecules of oxygen in sodium bicarbonate.
There are three atoms of oxygen in sodium bicarbonate.
There are three atoms of sodium bicarbonate.
Answer:
c
Explanation:
The modern periodic table arrangement is a result of all of the following except many scientists who contributed individual knowledge. total rejection of the early versions for modern ideas. much scientific reexamination and argumentation of ideas. periodic repetition of the chemical and physical properties of the elements.
when 2.5g of licl is dissolved in 112g of water the temperature of the water increases from 18.2 to 22.9
The dissolution of LiCl in water and the temperature rise from 18.2°C to 22.9°C suggests an exothermic dissolution process in thermochemistry, related to high school chemistry.
Explanation:The question deals with the dissolution of Lithium Chloride (LiCl) in water and the resulting temperature change, which is a concept in thermochemistry. When a solute dissolves in a solvent, it can either absorb heat from the water, resulting in a temperature decrease (endothermic) or release heat to the water, causing the temperature to increase (exothermic). The observed temperature increase from 18.2°C to 22.9°C in this scenario indicates that the dissolution of LiCl in water is an exothermic process. To calculate the heat involved in the process, one would need to know the specific heat capacity of the solution, which is often assumed to be similar to that of pure water (4.18 J/g°C) if the solution is not very concentrated.
The energy that is available to do work in a reaction is called
If a 68.2g sample of ammonium nitrate is dissolved in enough water to make 315mL of solution, what will be the molarity
Answer: The molarity of solution is 2.7 M
Explanation:
To calculate the molarity of solution, we use the equation:
[tex]\text{Molarity of the solution}=\frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (in mL)}}[/tex]
We are given:
Mass of solute (ammonium nitrate) = 68.2 g
Molar mass of ammonium nitrate = 80 g/mol
Volume of solution = 315 mL
Putting values in above equation, we get:
[tex]\text{Molarity of solution}=\frac{68.2g\times 1000}{80g/mol\times 315mL}\\\\\text{Molarity of solution}=2.7M[/tex]
Hence, the molarity of solution is 2.7 M
At the top of a mountain, the pressure is found to be 0.52 atmospheres. How does this compare to standard atmospheric pressure at sea level?
Answer:
It is less than(almost half) the atmospheric pressure at sea level.
Explanation:
When we move up high , the pressure decreases with increase in altitude.
The pressure or atmospheric pressure is due to air present.
As we move up, with the altitude the amount of air decreases which cause a decrease in atmospheric pressure.
If the pressure found to be 0.52 atm at the top of mountain it is due to higher altitude.
This is less than the normal or standard atmospheric pressure at sea level which is 1013.25 mbar or 1 atm.