Answer:
C
Explanation:
In the case of burning wood, stored potential energy in the wood is released due to heating by other excited atoms.
Final answer:
The burning of wood transforms chemical potential energy stored in the wood into heat energy, making option C the correct answer.
Explanation:
The correct energy transformation for the burning of a piece of wood is chemical potential energy to heat energy. This process is an example of a chemical reaction where the chemical energy stored in wood's molecules is released as heat and light energy when the wood combusts.
The chemical potential energy stored in the bonds of the wood is released as heat and light during the combustion process. This chemical potential energy is converted into heat energy, which is evident through the warmth generated by the burning wood. Additionally, some of this energy may also be transformed into light, but the primary conversion is from chemical potential energy to heat.
Can i get 1-10 plzzzzzz
Answer:
For 1-7
Radio Waves
Microwaves
Infrared Waves
Visible Light Rays
Ultraviolet Waves
X-rays
Gamma Rays
And for 8-10
8. shorter
9.higher
10. longer
Answer:
Explanation:
1. Radio Waves
2. Microwaves
3. Infrared Waves
4.Visible Light Rays
5. Ultraviolet Waves
6. x-rays
7. Gamma Rays
8. shorter
9.higher
10. longer
Which number is equal to -906,060?
NEWS
-9.0606 x 105
-9.06 x 105
9.06 x 10-5
9.0606 x 10-5
Answer:
answer is point no 9.o6×10-5
Answer:
A
Explanation:
Did it on edge 2020
What is a compound?
a combination of two or more substances that
are not chemically combined
O a combination of two or more elements that
are combined in a certain ratio
What is a solution?
a mixture of two or more substances that are
mixed evenly throughout
a mixture of two or more substances that are
chemically combined
DONE
Answer:
1) B 2) A
Explanation:
just did it on edg 2020
How many significant figures are in each measurement?
73,102 L
0.230 mg
603.00 dm
0.002750 m
Answer:
the first is 5
the second is 3
The third is 5
the last one is 4:)
Explanation:
10. A basic solution of Al(OH)3, has a pH of 9.85, what is the [OH-] concentration of the aluminum
hydroxide solution? *
Answer: The [tex][OH-][/tex] concentration of the aluminum hydroxide solution is [tex]1.41\times 10^{-10}[/tex]
Explanation:
pH or pOH is the measure of acidity or alkalinity of a solution.
pOH is calculated by taking negative logarithm of hydroxide ion concentration.
[tex]pOH=-\log [OH^-][/tex]
Putting in the values:
[tex]9.85=-\log[OH^-][/tex]
[tex][OH^-]=10^{-9.85}=1.41\times 10^{-10}[/tex]
Thus the [tex][OH-][/tex] concentration of the aluminum hydroxide solution is [tex]1.41\times 10^{-10}[/tex]
Answer: [tex][OH^{-}][/tex] of the aluminium hydroxide solution is [tex]1.41 \times 10^{-6}[/tex].
Explanation:
It is given that pH is 9.85 and the relation between pH and concentration of ions is as follows.
pH = [tex]-log [H^{+}][/tex]
9.85 = [tex]-log [H^{+}][/tex]
antilog (9.85) = [tex][H^{+}][/tex]
[tex][H^{+}] = 7.1 \times10^{-9}[/tex]
We also know that,
[tex][H^{+}][OH^{-}] = 10^{-14}[/tex]
[tex][OH^{-}] = \frac{10^{-14}}{7.1 \times 10^{-9}}[/tex]
= [tex]1.41 \times 10^{-6}[/tex]
Therefore, we can conclude that [tex][OH^{-}][/tex] of the aluminium hydroxide solution is [tex]1.41 \times 10^{-6}[/tex].
Which of these pumpkins has the most
thermal energy? Explain your answer.
Final answer:
The 3.5kg bowling ball rolling at 30m/s has a higher momentum than the 50kg student moving at 1.75m/s.
Explanation:
The momentum of an object is defined as the product of its mass and velocity. Therefore, to determine which object has a higher momentum, we need to calculate the momentum of each object. The momentum of an object can be calculated using the formula: momentum = mass * velocity.
For the 3.5kg bowling ball rolling at 30m/s, the momentum would be: momentum = 3.5kg * 30m/s = 105kg.m/s.
For the 50kg student moving at 1.75m/s, the momentum would be: momentum = 50kg * 1.75m/s = 87.5kg.m/s.
Comparing the two, we can see that the bowling ball has a higher momentum of 105kg.m/s, compared to the student's momentum of 87.5kg.m/s.
The two isotopes have the same number of _______ within the nucleus.
Answer:
The two isotopes have the same number of protons within the nucleus.
Explanation:
Answer:
Protons
Explanation:
Odyssey ware
The half life of carbon-14 is 5,730 years. ABOUT how old is a sample that has one-fourth of its carbon-14 unchanged?
a.10,000 years
b.15,100 years
c.11,400 years
d.5,700 years
Answer:
C. 11400 years.
Explanation:
The time constant of the isotope is:
[tex]\tau = \frac{5730\,yr}{\ln 2}[/tex]
[tex]\tau = 8266.643\,yr[/tex]
The decay of the isotope is described by the following model:
[tex]\frac{m(t)}{m_{o}} = e^{-\frac{t}{\tau} }[/tex]
[tex]-\frac{t}{\tau} = \ln \frac{m(t)}{m_{o}}[/tex]
[tex]t = -\tau \cdot \ln \frac{m(t)}{m_{o}}[/tex]
[tex]t = -(8266.643\,yr)\cdot \ln \left(\frac{1}{4} \right)[/tex]
[tex]t \approx 11460.001\,yr[/tex]
The right answer is C.
Type the correct answer in the box. Express your answer to two significant figures. An industrial vat contains 650 grams of solid lead(II) chloride formed from a reaction of 870 grams of lead(II) nitrate with excess hydrochloric acid. This is the equation of the reaction: 2HCl + Pb(NO3)2 → 2HNO3 + PbCl2. What is the percent yield of lead(II) chloride?
88.98 %
The Balance Chemical Equation is as follow,
2 HCl + Pb(NO₃)₂ → 2 HNO₃ + PbCl₂
According to equation,
331.2 g (1 mole) Pb(NO₃)₂ produces = 278.1 g (1 mole) PbCl₂
So,
870 g of Pb(NO₃)₂ will produce = X g of PbCl₂
Solving for X,
X = (870 g × 278.1 g) ÷ 331.2 g
X = 730.5 g of PbCl₂
Therefore,
Theoretical Yield = 730.5 g
Also as given,
Actual Yield = 650 g
So using following formula for percentage yield,
%age Yield = (Actual Yield / Theoretical Yield) × 100
Putting values,
%age Yield = (650 g / 730.5 g) × 100
%age Yield = 88.98 %
Brianliest please and thank you.
Final answer:
To find the percent yield of lead(II) chloride, calculate the theoretical yield based on the balanced chemical equation and the given amount of lead(II) nitrate. Then, divide the actual yield by the theoretical yield and multiply by 100% to find the percent yield.
Explanation:
To find the percent yield of lead(II) chloride, we need to compare the actual yield to the theoretical yield. The theoretical yield is the amount of lead(II) chloride that would be formed if the reaction went to completion. The actual yield is the amount of lead(II) chloride that was actually obtained in the experiment. To calculate the theoretical yield, we can use the stoichiometry of the balanced chemical equation.
From the equation, we can see that 1 mole of lead(II) nitrate reacts with 2 moles of hydrochloric acid to produce 1 mole of lead(II) chloride. Therefore, the amount of lead(II) chloride that would be formed from 870 grams of lead(II) nitrate can be calculated as follows:
Calculate the number of moles of lead(II) nitrate:
Use the mole ratio from the balanced equation to calculate the number of moles of lead(II) chloride that would be formed:
Convert moles of lead(II) chloride to grams:
The actual yield of lead(II) chloride is given as 650 grams. To calculate the percent yield, we use the formula:
Percent Yield = (Actual Yield / Theoretical Yield) x 100%
Substituting in the values we found:
Percent Yield = (650 / 748) x 100% = 86.77%
Which of the following is used as a refrigerant?
methane
esters
freon
fluorine
Answer:
Freon
Explanation:
Answer:
Freon
Explanation:
Freon is used as a refrigerant.
What determines the color of a rock?
O texture
O grain pattern
O mineral type
O grain shape
The color of a rock is determined by the type of mineral it contains. The presence of certain elements and the way light interacts with these minerals can influence the color. While other factors like texture or grain pattern may affect appearance, they do not fundamentally determine the color.
Explanation:The color of a rock is primarily determined by its mineral type. Different minerals have different colors due to various factors like the way light reflects off their surfaces, their structure, and the presence of certain elements. For example, quartz can be clear or cloudy white, obsidian is a dark, glossy black, and amethyst, a type of quartz, is purple due to the presence of iron. While the texture, grain shape or pattern may affect the overall appearance of a rock, it's the mineral content that fundamentally determines its color.
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5) Plasma osmolarity is approximately:
a) 300mOsm
b) 0.3 Osm
c) 300 x 10-3 Osm
d) They are all correct
Answer:
a
Explanation:
A sample of a gas occupies 2.76 L at 303K. What would the volume be if the temperature was increased to 404K? Assume constant
pressure and mass.
L Round your answer to the hundredths place.
Blank 1:
Answer:
If the temperature was increased to 404 K, its volume would be 3.68 L.
Explanation:
Charles' Law gives a relationship between the volume and the temperature of the gas at constant temperature. This law states that the volume of a given amount of gas held at constant pressure is directly proportional to the temperature.
[tex]V\propto T[/tex]
[tex]\dfrac{V_1}{V_2}=\dfrac{T_1}{T_2}[/tex]
Let
[tex]V_1=2.76\ L\\\\T_1=303\ K\\\\T_2=404\ K[/tex]
Let [tex]V_2[/tex] is new volume. Using above formula we get :
[tex]V_2=\dfrac{V_1T_2}{T_1}\\\\V_2=\dfrac{2.76\times 404}{303}\\\\V_2=3.68\ L[/tex]
If the temperature was increased to 404 K, its volume would be 3.68 L.
How many grams of propane (C3H8) will react with 3.29 L of O2 at 1.05 atm and -34° C? (Balance & use this equation: __ C3H8 + __ O2 → __CO2 + __ H2O)
Answer:
1.55g of propane, C3H8
Explanation:
Step 1:
The balanced equation for the reaction. This is given below:
C3H8 +5O2 —> 3CO2 + 4H2O
Step 2:
Data obtained from the question. This include the following:
Volume (V) of O2 = 3.29L
Pressure (P) = 1.05 atm
Temperature (T) = –34°C = –34°C +273 = 239K
Number of mole O2 =...?
Gas constant (R) = 0.082atm.L/Kmol
Step 3:
Determination of the number of mole of O2 that reacted.
The number of mole of O2 that reacted can be obtained by using the ideal gas equation as follow:
PV = nRT
Divide both side by RT
n = PV /RT
n = (1.05 x 3.29)/(0.082 x239)
n = 0.176 mole
Therefore, 0.176 mole of O2 was used in the reaction.
Step 4:
Determination of the number of mole of C3H8 needed to react with 0.176 mole of O2.
This can be obtained as follow:
From the balanced equation above,
1 mole of C3H8 reacted with 5 moles of O2.
Therefore, Xmol of C3H8 will react with 0.176 mole of O2 i.e
Xmol of C3H8 = 0.176/5
Xmol of C3H8 = 0.0352 mole
Step 5:
Conversion of 0.0352 mole of C3H8 to grams.
This is illustrated below:
Mole of C3H8 = 0.0352 mole
Molar mass of C3H8 = (3x12) + (8x1) = 44g/mol
Mass of C3H8 =...?
Mass = mole x molar Mass
Mass of C3H8 = 0.0352 x 44
Mass of C3H8 = 1.55g.
Therefore, 1.55g of propane, C3H8 were used in the reaction.
Final answer:
To find out how many grams of propane will react with 3.29 L of O₂ at 1.05 atm and -34° C, we use the Ideal Gas Law to calculate moles of O₂ and then use the stoichiometry of the balanced combustion equation to determine the moles of propane. The final step is to convert the moles of propane to grams, resulting in 1.614 grams of propane required.
Explanation:
The balanced chemical equation for the complete combustion of propane (C₃H₈) is:
C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(l)
Calculating Grams of Propane:
First, we need to use the Ideal Gas Law PV = nRT to determine the moles of O₂. Given that P = 1.05 atm, V = 3.29 L, R = 0.0821 L·atm/mol·K, and T = 239 K (-34 °C + 273 = 239 K), we can solve for n (the number of moles of O₂).
n = PV / RT
n = (1.05 atm * 3.29 L) / (0.0821 L·atm/mol·K * 239 K)
n = 0.183 moles of O₂
From the balanced equation, we see that 1 mole of C₃H₈ reacts with 5 moles of O₂. So, we need to find out how many moles of C₃H₈ will react with 0.183 moles of O₂ by dividing by the stoichiometric coefficient of O₂:
moles of C₃H₈ = 0.183 moles of O₂ / 5 = 0.0366 moles of C₃H₈
Now, we calculate the mass of propane by multiplying the moles of C₃H₈ by its molar mass (C₃H₈ = 44.09 g/mol):
mass of C₃H₈ = 0.0366 moles * 44.09 g/mol = 1.614 grams
Therefore, 1.614 grams of propane will react with 3.29 L of O₂ at 1.05 atm and -34° C.
Which of the following must be true in order for a newly designed product to function properly?
A.
The design must be aesthetically pleasing as well as functional.
B. The construction materials must be compatible with the design and the intended use of the product.
C.
The cost of building the product must be accurately determined, and production stays under budget.
D.
all of these
Answer:
B
Explanation:
Charcoal can be soaked in lighter fluid when grilling food. Lighter fluid is extremely flammable. This is an example of which type of property?
Physical property
Chemical property
Both A and B
Neither A nor B
The atomic number is the number of __________________in an atom.
neutrons
electrons
quarks
protons
Answer:
protons
Explanation:
What is the molarity of a solution with 2.1 mol of HCl in 400 mL of water? (M = mol/L)
A.) 0.00525 M
B.) 5.25 M
C.) 190 M
D.) 2.1 M
Answer:
A
Explanation:
When Holly injures her shoulder playing baseball, she uses an instant ice pack to reduce the swelling. She breaks the inner, activator portion of the instant cold pack releasing the solid urea into the surrounding water. What process does Holly observe as she uses the cold pack? A) Urea absorbs and releases heat energy into the surroundings. B) When the urea dissolves it absorbs heat and the cold pack gets colder. C) The urea causes the surroundings heat up as the cold pack releases energy. D) As the urea mixes in the water it releases heat making the cold pack colder.
Answer:
B) When the urea dissolves it absorbs heat and the cold pack gets colder.
Explanation:
Cold packs usually contains two bags, one contains a water and the other inside is a form of ammonium nitrate as the solid (s) or urea.
Breaking the inner portion activates the instant cold pack thereby releasing the solid urea into the surrounding water makes the urea to react with the water and makes it cold. This is because the reaction that takes place then undergoes an endothermic reaction, Hence heat is absorbed from the surroundings and the cold pack gets colder
The cold pack gets colder as a result of an endothermic reaction where urea dissolves in water and absorbs heat from the surroundings.
Explanation:When Holly activates her instant ice pack by breaking the inner compartment, she initiates an endothermic reaction in which the solid urea dissolves in water. During this endothermic dissolution, the urea absorbs heat energy from the surrounding environment, which includes Holly's injured shoulder. This absorption of heat causes the temperature of the pack and the surrounding area to decrease, thus the pack feels cold to the touch. Therefore, the process that Holly observes as she uses the cold pack is B) When the urea dissolves it absorbs heat and the cold pack gets colder.
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Which element has the most protons:
Krypton
Argon
Nitrogen
Chlorine
The answer would be A) Kyrpton
---
Krypton has 36 protons.Argon has 18 protons.Nitrogen has 7 protons.Chlorine has 17 protons.After looking at all of these numbers we can see that the element with the highest number of protons is krypton, at 36 protons.
~Hope I could help! Stay safe!~
Please help. Is it A.
B.
C.
Or
D.?
Answer: d
Explanation: i got it right on acellus
The greater the
of a gas at a given temperature, the smaller its volume.
Anexample of a weak acidis
OH SO.
OH
Akia is balancing the equation Na + H2O NaOH + H2. He tries to find the coefficients that will balance the equation. How could he find the correct coefficients?
Answer:
he can by checking up each person particle and make beyond any doubt the atom numbers are the same within the reactants and the products
Explanation:
i hope this helps
counting up each individual atom and make sure the atom numbers are the same in the reactants and the products
Explanation:
just found it on quizzlet
Based on the table above, which of the following is usually the smallest?
A.
a planet
B.
the Sun
C.
a moon
D.
the Solar System
Which diagram best illustrates the stage in the formation of the solar system at which the sun formed?
Answer:
A
Explanation:
Every thing was first a bunch of gas.
Potassium hydroxide (KOH) is a strong base
because it
A. easily releases hydroxide ions.
B. does not dissolve in water.
c.
reacts to form salt crystals in water.
D. does not conduct an electric current.
Final answer:
Potassium hydroxide is a strong base because it fully dissociates in water, A. easily releasing hydroxide ions. Potassium hydroxide (KOH) is a strong base because it easily releases hydroxide ions (OH-). When dissolved in water, KOH dissociates completely into K+ and OH- ions, increasing the concentration of hydroxide ions in the solution.
Explanation:
Potassium hydroxide (KOH) is considered a strong base because when it dissolves in water, it completely dissociates into potassium ions (K+) and hydroxide ions (OH-). This complete ionization in solution is characteristic of a strong base. Wrapping up, the correct answer to why KOH is a strong base is that it easily releases hydroxide ions into the solution.
Final answer:
Potassium hydroxide (KOH) is a strong base because it completely dissociates into potassium ions (K+) and hydroxide ions (OH-) in water, easily releasing hydroxide ions. This complete ionization defines its strength as a base and sets it apart from weak bases, which do not fully ionize.
Explanation:
Potassium hydroxide (KOH) is characterized as a strong base because it easily releases hydroxide ions when dissolved in water. The dissolution of KOH in water is a highly exothermic process where it dissociates completely into potassium (K+) and hydroxide (OH-) ions. This characteristic of complete ionization in solution is what defines a strong base, in contrast to weak bases that only partially ionize.
Unlike substances that do not dissolve well or do not conduct electricity, KOH is very soluble in water and is a good electrical conductor due to the movement of ions. Strong bases like KOH are important in various industrial processes due to their reactivity toward acids and their corrosive nature.
Understanding the behavior of strong bases can be crucial in areas such as acid-base chemistry, titrations, and pH calculations. Potassium hydroxide's complete dissociation into ions is typical of soluble metal hydroxides and is an indicator of its strength as a base.
Use the electron-dot notation to demonstrate the formation of an ionic compound involving the elements Al and S
Aluminum (Al) loses three electrons to form an Al³+ cation while sulfur (S) gains two electrons to form an S²- anion. These cations and anions combine in a 2:3 ratio to form the compound Al2S3.
Explanation:The electron-dot notation, also known as Lewis symbols, can be used to demonstrate the formation of an ionic compound involving the elements aluminum (Al) and sulfur (S). The aluminum atom loses three electrons to achieve a stable electron configuration, resulting in an aluminum cation with a charge of +3 (Al³+). On the other hand, sulfur gains two electrons to complete its octet, forming a sulfide anion with a charge of -2 (S²-). However, to balance the charges, we need two sulfide ions for every aluminum ion, leading to the formation of the compound Al2S3.
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Which solution is the most concentrated
Answer:
The most concentrated solution is the one with the highest molarity. Molarity is calculated by taking the moles of solute/ liters of solution. The already gave you the molarity, so you do not need to calculate it. The most concentrated solution is the 0.25 M KCl.
Hope this helps!
The fishing techniques of bottom trawling and dredging involves dragging huge, heavy nets across the ocean floor. These techniques are more effective than traditional fishing techniques. However, the nets damage the ocean floor and fishing boats empty wastewater into the sea. Which adverse effects do bottom trawling and dredging have on the biodiversity of marine environments? Select all that apply.
Choose all that apply:
Overexploitation
Pollution
Overpopulation
Introduction of invasive species
Habitat destruction
Answer:
pollution and habitat destruction
Explanation:
Brainliest plzz. to help a sister out