[tex]\tt \dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}[/tex]
T₁=17+273=290 K
7.75x10⁴.850/290 = 8.10x10⁴.720/T₂
T₂=256.74 K = -16.26°C
The final temperature can be measured using combined gas law. The final temperature of the gas with the volume of 8 L and 1 atm pressure is 260 °C.
What is combined gas law :Combined gas law states the relation between volume, temperature and pressure of a gas as written below:
PV/T = constant.
This law is the combination of Boyle's law, Charle's law and Gay-Lussac's law.
Given the initial quantities:
P1 = 7.75 × 10⁴
V1 = 850 cm³
T1 = 17 °C
Final quantities:
P2 = 8.10 × 10⁴
V2 = 720 cm³
Then, P1 V1/T1 = P2 V2/ T2
The final temperature T2 = P2 V2 T1/P1 V1
T2 = ( 8.10 × 10⁴×720 cm³× 17°C)/ ( 7.75 × 10⁴ × 850 cm³ L) = 15°C
Therefore, the final temperature is 15°C.
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A starfish opening a clam is physical change or chemical change?
Answer: Physical change
Explanation: Quite simple as the starfish opening a clam would mean the starfish is physically changing the clams look.
A starfish opening a clam is a chemical change because opening a clam will be done by the secretion of saliva from the starfish that will open the clam.
What are physical and chemical changes?The term “physical change” refers to a change in an object's appearance. When there is a change in the surroundings of the object, such as a rise in temperature or pressure, a physical change takes place.
When candles are burned, the wax melts, but as soon as the temperature drops, the wax hardens and solidifies once more.
A chemical change is a change that can be done by a reaction between two substances that can come in contact. A starfish is opening a clam to eat the clam, it can be done by the mouth which secretes an enzyme that will open the clam.
Thus, a starfish opening a clam is a chemical change.
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PLEASE HELP!!! ‼️45 POINTS‼️
What happens to the temperature of the water when it begins to melt?
A. The temperature continues to decrease during the change of
state.
B. The temperature remains at 0°C until the change of state is
complete.
C. The temperature remains at 100°C until the change of state is
complete
D. The temperature continues to increase during the change of state.
A dog has a total of 78 chromosomes. Through the process of meiosis, new cells are
created. How many chromosomes would the parents' cells have?
How to determine how long a branch is with mass and torque.
Answer:
First determine the lever arm and then multiply it times the applied force.
The equation τ = m(r^2)α is the rotational analog of Newton's second law (F=ma)
Hope this helps.
Enter an equation to show how h2po3− can act as a base with hs− acting as an acid. Express your answer as a chemical equation. Identify all of the phases in your answer.
The acid - base equation between H2PO3^- and HS^- is H2PO3^- + HS^- ⇄S^- + H3PO3.
What is an acid?An acid is a substance that can donate hydrogen ions while a base is a substance that can accept hydrogen ion. This is the acid base definition according to Brownstead - Lowry.
To show the acid - base relationship between H2PO3^- and HS^-, we have the equation;
H2PO3^- + HS^- ⇄S^- + H3PO3
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Can someone help me balance this equation please?
Br2 + S2O32– + H2O → Br1– + SO42– + H+
Explanation:
Br2 + S2O32- + 5H2O –> 2Br- + 2SO4 + 10H+ + 6e
What is scientific notation, and why it is useful for reporting scientific measurements?
Plsssssssssssssssssssssssssssssssssssssssss
Answer:
laurasia and gondwana is the correct answer
What is the F-Xe angle in the molecule - F; Xe * F_{2} (Xe has three lone pairs of electrons )?
The molecule has a Linear shape with a bond angle of 180 degrees.
What is bond angle?Bond angle refers to the dihedral angle between two atoms that are connected to the same central atom. The central atom in this case is Xe.
We are told that there are three lone pairs of electrons that surround Xe. It then follows that the molecule has a Linear shape with a bond angle of 180 degrees.
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How many grams of solid calcium hydroxide are in 250mL of a 1. 5M solution
Is this a scientific model? Use complete sentences to explain why or why not.
Answer:
Yes
Explanation:
Beacuse it shows the tempature of the day
What is the diffrance between atomic orbital and energy levels?
Why does benzene form a ring?
Answer:
All of the carbon-carbon bonds have exactly the same lengths - somewhere between single and double bonds. There are delocalized electrons above and below the plane of the ring. The presence of the delocalized electrons
Explanation:
hope it helps
Why would a biological stain be used? (Give examples of stains and their uses)
Answer:
Biological stains are used for the medical and biological industries to aid in detection of structures within tissues. This can include the detection of abnormalities, but is not limited to that. The stains are used to define and examine cell populations within the tissues, to mark cells, or to flag proteins.
In mitosis, how does a daughter cell compare with its parent cell?
A.
A daughter cell and its parent cell are exact copies of each other.
B.
A daughter cell has twice as many chromosomes as its parent cell.
C.
A daughter cell has half as many chromosomes as its parent cell.
D.
A daughter cell has no similarity to its parent cell.
Why put aluminum foil on door knobs when you are alone.
Aluminum foil on door knobs when we want to paint a door to avoid paint stains
Aluminum foil UsageAluminium is an element of the periodic table with an atomic number 13.
Now, When painting alone, aluminum foil is used in wrapping doorknobs, and this practice is done to keep paint off.
The usage aluminum foil is an efficient way of keeping away paint from touching door knob
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which of the following molecules would have the lowest boiling point? C4H10 C3H8 C2H6 CH4
Answer:
CH4
Explanation:
this would have the lowest boiling point as it has the least amount of intermolecular forces and is the smallest molecule and would be easier to break apart rather than the higher boiling points (C4H10 etc)
hope this helps
The reaction between lead(II) nitrate and aluminum chloride
produces lead(II) chloride and aluminum nitrate. Find the mole
ratios of lead(II) nitrate to aluminum chloride and lead(II)
chloride to aluminum nitrate.
The mole ratio of lead (II) nitrate to aluminum chloride would be 3:2 while that of lead (II) chloride to aluminum nitrate would also be 3:2
Chemical equations
The balanced chemical equation of the reaction between lead(II) nitrate and aluminum chloride is as follows:
3Pb(NO3)2 + 2AlCl3 → 3PbCl2 + 2Al(NO3)3
Thus, the mole ratio of lead (II) nitrate to aluminum chloride is 3:2 while the mole ratio of lead (II) chloride to aluminum nitrate is also 3:2
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Answer:3:2 and 3:2
Explanation: got it right on CK12
The change shown in the photo involves which two energy transformations?
A. Chemical energy -> electromagnetic energy
B. Thermal energy -> electrical energy
C. Chemical energy -> thermal energy
D. Thermal energy -> chemical energy
Answer:The answers are both D,B
Explanation: Hope its right!
Answer:
It should be A and C
Explanation:
Germanium has an atomic number of 32 and an atomic mass of 72.61. What is the total number of electrons in an atom of germanium?
Answer:
32
Explanation:
Because if the atomic number is 32 that is how many electrons are found in the element. There are 42 neutrons and 32 protons
Describe two ways of using solar energy.
Where is the production of hydroelectric energy practical?
Describe two ways to release biomass energy.
Describe two ways to use geothermal energy.
PLEASE ITS DUE IN 6 MINTUES
Answer:
There are three primary technologies by which solar energy is harnessed: photovoltaics (PV), which directly convert light to electricity; concentrating solar power (CSP), which uses heat from the sun (thermal energy) to drive utility-scale, electric turbines; and solar heating and cooling (SHC) systems, which collect ...
Hydropower is the most important and widely-used renewable source of energy. Hydropower represents about 17% (International Energy Agency) of total electricity production. China is the largest producer of hydroelectricity, followed by Canada, Brazil, and the United States (Source: Energy Information Administration).
There are four ways to release the energy stored in biomass: burning, bacterial decay, fermentation, and conversion to gas/liquid fuel.
Geothermal energy can heat, cool, and generate electricity: Geothermal energy can be used in different ways depending on the resource and technology chosen—heating and cooling buildings through geothermal heat pumps, generating electricity through geothermal power plants, and heating structures through direct-use ...
Can you post all the answers for this quick check Reactants vs. Products Quick Check
According to the law of conservation of mass, which statement about chemical reactions is always true?(1 point)
1) According to the law of conservation of mass, which statement about chemical reactions is always true?
Answer: The number of atoms of each element in the reactants is the same as the number of atoms of each element in the products.
2) When 1 mole of nitrogen gas (N2) reacts with 3 moles of hydrogen gas (H2), how many moles of ammonia (NH3) are produced?
Answer:
2 moles
3) Sulfur trioxide gas combines with water to form a single product.
SO3 + H2O → ?
Based on the law of conservation of mass, which option is the product of the reaction?
Answer:
H2SO4
4) Lead (II) nitrate as Pb(NO3)2 and potassium iodide as KI combine to form the products shown.
2 KNO3 + PbI2
How many moles of each reactant are involved in the reaction?
Answer:
1 mole of lead (II) nitrate and 2 moles of potassium iodide
5) In a reaction, 1 mole of silver nitrate combines with 1 mole of sodium chloride.
AgNO3 + NaCl
Which statement about the product is justified by the law of conservation of mass?
Answer:
There will be 1 mole of silver (Ag) in the product.
According to the law of conservation of mass, the statement that is always true about chemical reactions is "The total mass of the reactants is equal to the total mass of the products."
The law of conservation of mass states that in a closed system, the total mass of substances before a chemical reaction is equal to the total mass of substances after the reaction.
The matter is neither created nor destroyed during a chemical reaction; it is simply rearranged to form new substances.
This principle holds true for all chemical reactions, regardless of the types of substances involved or the complexity of the reaction.
It also helps to establish the stoichiometry of reactions, which involves determining the relative quantities of substances involved in a reaction based on their balanced chemical equation.
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Explain the difference between oxidation and digestion
meaning: oxidisation occurs when an element is oxidised or losses electrons. major example: rusting of iron.
meaning: digestion is the break down of food molecules into nutrients which the body later uses for energy, development, cell repair, etc. major part of digestion occurs in small intestine and begins from mouth.
Answer:
Oxidation releases energy from the food for us to use and occurs when an element is oxidized or loses electrons.
Digestion is the breakdown of food small enough to be absorbed by the cells. It turns the molecules into nutrients which the body later uses for energy, development, cell repair, etc. The digestion process occurs in the small intestine and begins from the mouth.
In conclusion, this shows how they are different.
Explanation:
How many grams are there in 3.3 x 1023 molecules of N2I6?
Answer:
The number of grams is 434.5 g.
Explanation:
How many joules of heat are needed to heat at 13.00 grams of water from
55.00 °C to 93.00 °C.
-2065 J
5054 J
2065 J
2989 J
Answer: the third one 2065
Explanation:
q= (13g)(4.18)(38)
q=2064.92 ≈ 2065
You have 1.50 L of a stock solution of 4.75 M hydrochloric acid. You need to dilute it to 1.20 M. What is the maximum volume of the dilute solution can you make
Answer:
5.9375 L
Explanation:
To solve this question you use the proportionality of dilutions
C1 × V1 = C2 × V2
4.75 M × 1.50 L = 1.20 L × V2
⇒ V2 = (4.75 M × 1.50 L) / (1.20 L) = 5.9375 L
Which formula represents a hydrocarbon?
Answer:
methane-CH4
have a good day
The total energy radiated by a blackbody depends on.
After anaerobic exercise, lactic acid is converted to pyruvic acid, which enters the ____________ pathway and can be used for energy
Answer:
body
Explanation:
because if latic acid is conveted to pyruvic acid.
as a puck falls its potential energy decreases why
Answer:
because its getting converted into another form of energy, as the puck is falling its increasing its velocity at a rate which decreases its potential energy and increases its frictional energy which then converts to kinetic energy as it hits an object or the floor.
Explanation:
