Heat is the amount of energy transferred from and to the object or the substance of the system. When heat flows into a system its value is positive.
What are free energy changes and enthalpy?Change in the free energy of the system is shown as [tex]\rm (\Delta G)[/tex] it tells about the reversible work performed by the system in thermodynamically constant pressure and temperature.
The enthalpy is equal to the heat formation and is shown as [tex]\rm (\Delta H)[/tex]. It represents the total heat content of the reaction and enthalpy change of the final and the initial system.
Q or the heat when flows in the system for the reaction is a positive value as the energy of the system gets increased while when the heat is released from the reaction then the value is negative as the energy decreases.
Therefore, heat transfer to the system is positive.
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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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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.
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.
Which information is represented by a line on this map?
A. points with the same elevation
B. the location of a road
C. a direction north or south
D. a direction east or west
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.
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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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.
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
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.
The energy that is available to do work in a reaction is called
A scientist did an investigation on the growth of koi fish. He selected forty newly hatched koi from the same clutch of eggs. He separated the koi into four groups and placed each group in a different sized pond. None of the ponds had any predators that would eat the koi fish. The amount of food available to the koi and the water quality of each pond differed based on the size of the pond. Larger ponds had more food available and better water quality as the fish grew.
After 15 months, the scientist measured the length of each koi fish. Using these measurements, he came up with an average koi size for each pond.
Effect of Pond Size on Koi Fish Growth
Size of Pond Average Length of Koi
500 gallons 18.2 centimeters
1000 gallons 25.6 centimeters
2500 gallons 30.8 centimeters
5000 gallons 35.3 centimeters
Based on the scientist's results, which of the following is true?
A.
Koi fish grow fastest in ponds with poor water quality.
B.
Koi fish grow fastest in ponds with a high population density.
C.
The growth of koi fish is determined entirely by genetics.
D.
The growth of koi fish is affected by the environment of the fish.
Answer:
d
Explanation:
just did it
From the results, it is clear that, the growth of the koi fish is depending on the environment in which it grows. This include, the size of pond, food available, water quality, presence of predators etc. Hence, option D is correct.
What are environmental factors affecting fish growth ?The condition of the water in which fish are grown directly affects their health and eventual growth. In general, physical, chemical/biochemical, or a combination of these components can be used to categories factors impacting fish growth and productivity in freshwater aquatic systems.
Temperature and suspended and settleable particles concentrations are significant physical water characteristics for the development and growth of fish; crucial chemical water characteristics include pH, alkalinity, hardness, and metal concentrations.
The adequate size of pond let the fish free to move more and make it more energetic with the surroundings. Hence, the growth of koi fish is affected by the environment of the fish.
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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
What is the difference between creep and a landslide?
A creep is a slow downhill movement of weathered rock material.
A landslide is a sudden movement of rock and soil down a slope.
Basically, creeps are slower than landslides.
the rows on the periodic table correspond to
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
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]
What’s the molar mass of Lead-208
Which nonmetallic mineral is used as a building material and also in the manufacture of steel
Answer: limestone
Explanation:
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
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.
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:
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?
Select all that apply.
How may the concentration of chloroform be increased as Cl2 gas reacts with CH2Cl2?
increase [HCl]
remove HCl from the product
increase [Cl2]
the rate of reaction cannot be changed
Answer:
increase [Cl₂]
remove HCl from the product
Explanation:
Odyssey ware
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.
How are elements arranged in the Periodic Table? A. by their properties B. alphabetically C. by how much they are worth D. in the order they were discovered 2. (10 pt) Which is the correct symbol for the element silicon? A. SI B. S C. Si D. Sil 3. (10 pt) All atoms of an element are ________ . A. flammable B. visible under a microscope C. alike D. different 4. (10 pt) Elements that are usually shiny and good conductors of heat and electricity are known as ________________. A. gases B. metals C. solids D. nonmetals 5. (10 pt) The most recent model of an atom is the _______________. A. Bohr model B. Einstein model C. Nucleus model D. Electron Cloud model 6. (10 pt) Elements that are usually dull, brittle, and do not conduct electricity are known as A. gases B. metals C. solids D. nonmetals 7. (10 pt) Elements join together to form A. compounds B. ions C. protons D. atomic masses 8. (10 pt) Which picture best shows an atom? A. B. C. D. 9. (10 pt) In order for a chemical reaction to take place, a certain amount of _______________ must be present. A. heat B. friction C. chemicals D. energy 10. (10 pt) Enzymes are ____________ in the body that speed up chemical reactions. A. catalysts B. cells C. concentrations D. chloroplasts
Answer:
In the modern periodic table, the elements are listed in order of increasing atomic number. The atomic number is the number of protons in the nucleus of an atom. ... In a periodic table arranged in order of increasing atomic number, elements having similar chemical properties naturally line up in the same column
Explanation:
I hope this helps
Final answer:
The Periodic Table is arranged by their properties, with elements grouped according to similar chemical and physical characteristics. Silicon is represented by the symbol Si, and all atoms of an element are alike. Metals are shiny and good conductors, while nonmetals are dull and poor conductors.
Explanation:
1. Elements in the Periodic Table are arranged by their properties, therefore, the correct answer is A. by their properties.
2. The correct symbol for the element silicon is C. Si.
3. All atoms of an element are alike, meaning the correct answer is C. alike.
4. Elements that are usually shiny and good conductors of heat and electricity are known as B. metals.
5. The most recent model of an atom is the D. Electron Cloud model.
6. Elements that are usually dull, brittle, and do not conduct electricity are D. nonmetals.
7. Elements join together to form A. compounds.
8. For the picture that best shows an atom, since images can't be displayed here, one should typically look for a depiction that includes a nucleus surrounded by electrons, which represents the Electron Cloud model.
9. In order for a chemical reaction to take place, a certain amount of D. energy must be present.
10. Enzymes are A. catalysts in the body that speed up chemical reactions.
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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What group of elements has the most stable arrangement in their outer energy level?
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+5.
The diagram illustrates part of the carbon cycle.
Which best describes the diagram?
A consumer is obtaining carbon by breathing it in from the atmosphere.
A consumer is obtaining carbon by absorbing it from the soil.
A consumer is obtaining carbon by eating carbon-based molecules stored in a producer.
A consumer is obtaining carbon by eating carbon-based molecules stored in a decomposer.
Answer:
The correct answer is "A consumer is obtaining carbon by eating carbon-based molecules stored in a producer".
Explanation:
The animal is consuming the carbon present in the molecules stored in the grass. Plants process the carbon present in the soil along with other minerals. The animal, when it feeds on these plants, is consuming the carbon they obtained from the soil. Grasslands are defined largely by their use for grazing, which includes between 10 and 30 percent of soil carbon worldwide.
Have a nice day!
Answer:
C
Explanation:
it was right on (edge nuity)
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