According to this law, some heat given to the system is used to change the internal energy while the rest is used in doing work by the system.
This relationship is mathematically represented as follows:
ΔQ = ΔU + W
where ΔQ is the heat given or lost, ΔU is the change in internal energy and W is the work done.
The second law of thermodynamics :If a room is not tidied or cleaned, it invariably becomes more messy and disorderly with time.
When the room is cleaned its entropy decreases but the effort to clean it has resulted in an increase in entropy outside the room that exceeds the entropy lost.
The Third law of thermodynamics :The entropy of a pure crystalline substance (perfect order) at absolute zero temperature is zero. This statement holds true if the perfect crystal has only one state with minimum energy.
Philip finds this information while doing research about margarine, which is a synthetic food product.
Hydrogenation is a process through which vegetable oil is changed from a liquid into a solid. During hydrogenation, a chemical reaction occurs. Hydrogen is added under pressure to the vegetable oil, resulting in a synthetic form of fat called trans fat. Trans fats typically taste better and can be stored longer than natural vegetable oils. A food product that results from hydrogenation is margarine. The Mayo Clinic website explains that margarines that contain trans fats increase the risk of heart disease and increased levels of cholesterol in the blood. Trans fats also reduce the amount of “good” cholesterol in the blood. Trans fats occur naturally in meat and dairy products. A 2009 report in Advances in Nutrition suggests that trans fats from animal products, such as dairy, beef, and lamb, may have beneficial health effects, including reducing the chance of developing heart disease or cancer. Which conclusion is best supported by the information that Philip gathered?
0 A) Trans fats have little effect on your health.
O B) Experts recommend avoiding trans fats altogether.
O C) Research shows conflicting evidence of the effect of trans fats on human health.
O D) Trans fats produced by hydrogenation have the same overall effect on human health as naturally occur- ring trans fats.
Answer:
Research shows conflicting evidence of the effect of trans fats on human health.
what is the frequency if the speed is 15 m/s and the wavelength is 3m ?
Answer:
5
Explanation:
15/3=5
as frequency = speed/ wavelength
Answer:
5Hz
Explanation:
Speed = Wavelength × Frequency
15. = 3. × ?
15 ÷ 3 = 5
Unit = Hz which means Hertz
Hope this helps
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When water is electrolyzed, it splits into hydrogen and oxygen.
What can be said about the masses of the reactants and products?
(1 point)
The mass of water is equal to the mass of oxygen.
The mass of water is equal to the mass of oxygen.
The mass of water is equal to the mass of hydrogen.
The mass of water is equal to the mass of hydrogen.
The mass of hydrogen produced is equal to the mass of oxygen produced.
The mass of hydrogen produced is equal to the mass of oxygen produced.
The mass of water is equal to the combined mass of hydrogen and oxygen.
The mass of water is equal to the combined mass of hydrogen and oxygen.
The mass of water is equal to the combined mass of hydrogen and oxygen.
What is Mass?This is defined as the quantity of matter in a physical body. The electrolysis reaction of water can be seen below:
2 H₂O ---> 2 H₂ + O₂
We can deduce that 36 grams of H₂O dissociated to give 4 grams of H₂ and 32 grams of O₂ which option D was chosen as the appropriate choice.
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How many atoms are in 15.1g of potassium?
Answer:
2.32 x10^23 atoms
Explanation:
15.1/39.10 x (6.02 x10^23)
= 2.32 x10^23 atoms
First, you divide 15.1 g of potassium by its molar mass. (Molar mass of potassium is 39.10 g). Then you multiply using Avogadro's number (6.02 x10^23) to get your answer.
A salt in which the anion is the conjugate _____ of a weak _____ will produce a basic solution. (Assume that the cation does not hydrolyze.)
Answer: conjugate base of a weak acid
Explanation: If the anion is a conjugate base of a weak acid, the solution would be basic. This is because weak acids do not produce enough hydrogen ions in the solution so does not really affect the acidity, so the conjugate base can react with water in the solution to produce a basic solution.
This question is about the extraction of metals.
Element R is extracted from its oxide by reduction with hydrogen.
The equation for the reaction is:
3H2 + RO3 R + 3H20
03
1
The sum of the relative formula masses (M) of the reactants (3H2 + RO3) is 150
Calculate the relative atomic mass (A) of R.
Relative atomic masses (A): H = 1 O= 16
I
I
[2 marks]
Relative atomic mass (A) of R =
The relative atomic mass of the element R is 96.
What is the relatives atomic mass of an element?The relative atomic mass of an element is the number of times the mass of one mole of that element is heavier than 1/12 the mass of one atom of carbon-12.
The relative atomic mass of an element can also be obtained from the fomula mass of the compound the element occurs in
The sum of the relative formula masses (M) of the reactants (3H2 + RO3) = 150
3 × 2 × 1 + R + 16 × 3 = 150
R = 150 - 54
R = 96
Therefore, the relative atomic mass of R is 96.
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A. 63 kg ball is moving at 4. 3m/s. What is the momentum of the ball?
At 45.2 L cylinder containing C2H2F4 at a pressure of 3.00 atm is connected by the valve to 4060 mL cylinder containing N2H4 at 1.50 atm pressure. Calculate the partial pressuure(atm) of N2H4 when the valve is opened.
The partial pressure of the N2H4 gas is 1.50 atm.
Dalton's law of partial pressureFrom the Dalton's law of partial pressure, the total pressure of a mixture of gases is the sum of the individual partial pressures of all the gases present in the mixture.
We have the following;
C2H2F4 = 3.00 atm
N2H4 = c
Total pressure = 3.00 atm + 1.50 atm = 4.50 atm
Hence, the partial pressure of the N2H4 is N2H4.
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An atom of oxygen has six electrons in its outermost ring and requires two more to become stable. What is the valence number of oxygen
Answer: Oxygen in its natural state has 6 valence electrons.
Explanation: The atomic number/ proton number of oxygen is 8, as seen on the periodic table. This is equal to the electron number.
This means there are 2 electrons in the core s shell (innermost), and 6 electrons in the p shell (outermost).
Valence electrons are the electrons found in the outermost shell, so Oxygen has 6 valence electrons.
I don't know if you've been taught electron configuration, but Oxygen's electron configuration is: [tex]1s^2 2s^2 2p^4[/tex] . The 2s and 2p are orbitals of the outermost ring in Oxygen, so adding 2+4 = 6 valence electrons.
A block of ice is placed outside on a hot summer dayDescribe the changes in particle motion and the corresponding changes in energy as the ice melts and eventually becomes water vapor .
Answer:
When solid ice gains heat, it changes state from solid ice to liquid water in a process called melting. Ice cubes in a cold drink, for example, gradually melt. ... When water absorbs enough heat, it becomes a gas (water vapor). This process is called evaporation.
Explanation:
When solid converts to gas then heat is required to break the intermolecular forces of attraction between the particles. In this process heat increase but temperature remains the same. Therefore, firstly melting and then evaporation takes place.
What is phase transition?Phase transition is a process in which transition takes place from one state to another of a medium on changing temperature or pressure. Phase transition is a physical process as there is no breaking of old bond and forming of new bonds takes place.
Melting is the process by which solid ice transforms into liquid water when exposed to heat, while evaporation is the process by which it transforms into gas. During evaporation and melting, heat energy is taken from the surrounding.
Therefore, firstly melting and then evaporation takes place.
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what is a biom what dose it do and why is it a thing lol
Answer:
a major ecological community, extending over a large area and usually characterized by a dominant vegetation.
You must apply a force to put an object in motion or ________an object from moving.
(answer the blank)
Answer:
any push or pull that causes an object to move, stop, or change speed or direction
Description:
zayn your my enemy
A population of deer live in a forest ecosystem. Which of these describes a density-independent factor that could affect this population?
A. An invasive species causes increased competition for space.
B. A new predator is introduced into the ecosystem.
C. A wildfire occurs in the ecosystem.
D. The deer population's food supply decreases.
Answer:C. A wildfire occurs in the ecosystem.
Explanation: I just got it right
how many moles of methane (ch4) are in 7.31x10^25 molecules help please
Answer:
1.168 x 10^28
Explanation:
CH4= carbon + hydrogen: 12+(4 x1)= 16g
16 7.3 x 10^25
----- x ------------------- = 1.168 x 10^28
1 1
Can someone please help me on this?
Answer:
c
Explanation:
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Determine what’s wrong with these electronic configurations
Answer:
Explanation:
19) it is 3d10 instead of 4d10
20) it is missing 3p6, and 4s2 before 3d5
21) Ra is not a noble gas
22) Cs is not a noble gas
what is the trophic level of common Prawn? primary,secondary,or tertiary consumer?
Answer:
secondary consumer
Explanation:
The salt water food web begins with producers (plants, algae, phytoplankton) that create food from sunlight, and continues with primary consumers (zooplankton) that eat the producers, followed by secondary consumers (shrimp, crustaceans, small fish) that eat the primary consumers, then tertiary consumers
Select the correct answer.
A certain reaction has this form: aA bB.
At a particular temperature and [A]0 = 2.00 x 10-2 Molar, concentration versus time data were collected for this reaction and a plot of ln[A]t versus time resulted in a straight line with a slope value of -2.97 x 10-2 min-1.
How much time is required for the concentration of A to decrease to 2.50 x 10-3 Molar?
A.
70.03 minutes
B.
0.0096 minutes
C.
0.589 minutes
D.
29.70 minutes
E.
100 minutes
Answer:
uhm I think it would be letter C. 0.589
A sample of oxygen that occupies 1.00 * 10^6 at 575 mm Hg is subjected to a pressure of 1.25 atm. What will the final volume of the sample be if the temperature is held constant?
A sample of oxygen occupies 1.00 × 10⁶ mL at 575 mmHg. If the pressure is increased to 1.25 atm, the volume decreases to 6.06 × 10⁵ mL.
What does Boyle's law state?Boyle's law states that the pressure of a given mass of an ideal gas is inversely proportional to its volume at a constant temperature.
Step 1: Convert the initial pressure to atm.We will use the conversion factor 1 atm = 760 mmHg.
575 mmHg × 1 atm/760 mmHg = 0.757 atm
Step 2: Calculate the final volume of the gasA sample of oxygen occupies 1.00 × 10⁶ mL (V₁) at 0.757 atm (P₁).
If the pressure is increased to 1.25 atm (P₂), we can calculate the new volume (V₂) using Boyle's law.
P₁ × V₁ = P₂ × V₂
V₂ = P₁ × V₁ / P₂
V₂ = 0.757 atm × 1.00 × 10⁶ mL / 1.25 atm = 6.06 × 10⁵ mL
A sample of oxygen occupies 1.00 × 10⁶ mL at 575 mmHg. If the pressure is increased to 1.25 atm, the volume decreases to 6.06 × 10⁵ mL.
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Suppose a particular star is projected from a firework at a starting height of 520 feet with an initial upward velocity of 72ft/sec. The equation h= -16t^2+72t+520 gives the star's height in feet at time t in seconds
By finding the vertex of the parabola, we will see that the firework reaches the maximum height in 2.25 seconds.
How long will take to reach the maximum height of the path?
The height of the firework is given by:
h = -16*t^2 + 72*t + 520
This is a quadratic equation, the maximum will be at the vertex.
Remember that for a quadratic equation:
y = a*x^2 + b*x + c
The x-value of the vertex is:
x = -b/2a.
Then for our equation:
h = -16*t^2 + 72*t + 520
The vertex will be at:
t = -72/(2*-16) = 2.25s
This means that the firework will reach the maximum height in 2.25 seconds.
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what is the most common element found in the universe?
Answer:
Carbon, my good sir hope it helps!
Explanation:
Fill in the blank :
______ ________ are the electrons of an atom that participate in chemical reactions. These electrons determine the basis for the periodic properties of an element.
Answer:
The number of electrons in the outermost shell of a particular atom determines its reactivity, or tendency to form chemical bonds with other atoms. This outermost shell is known as the valence shell, and the electrons found in it are called valence electrons
Explanation:
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A scients produces zinc iodide (Zn).
This is the method used
1. Viegh 0.500g of iodine
2 Dissolve the iodine in ethanol
3. Add an excess of zinc
4 Sir the mature until there is no further change
5. Fiter of the excess zinc
5. Evaporate of the ethanol
a Calculate the minimum mass of zinc that needs to be added to 0.500 g of iodine so
that the iodine fully reacts
The equation for the reaction is
Zn + Zniz
Relative atomic masses (Me): Zn = 65
1 = 127
Answer im a little confused what exactly you need answered. please clarify
Explanation:
Answer:
Environment is the nature and surroundings in which all plants, animals, humans and other living beings live and operate. ... It includes sunlight, atmosphere, land, water, plants, animals, sea life, minerals, different species and everything that occurs naturally on earth.Explanation:
[tex] \: \: \: [/tex]
What ions are formed when naoh is dissolved in water?.
Answer:
When sodium hydroxide (NaOH) dissolves in water, it separates into positively - charged sodium ions (cations) and negatively - charged hydroxide ions (anions).
Explanation:
what is osmosis and it's functions
Answer:
Osmosis is a passing of material and especially water through a membrane (as of a living cell) that will not allow all kinds of molecules to pass. Osmosis allows water to pass through cell membranes. The transfer of water from a dilute solution to a concentrated solution over a partly permeable membrane is defined as osmosis.
Explanation:
I hope this helps :)
Which best represents a homogeneous mixture of an element and a compound.
Answer:
The composition of air this is because it vmade up of oxygen, nitrogen, Nobel gages and Carbon dioxide
A gas at 7.75 x 104 Pa and 17°C occupies a volume of 850. cmº. At what temperature, in degrees Celsius, would the gas occupy 720. cm3 at 8.10 x 104 Pa?
[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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HELP ME PLEASE 100 POINTS!!!!!!!!!
Record the weight showing on the scales by clicking on the Report button below.
How many foot-pounds of work were done?
Force (weight from scale reading in above question) times the distance (1 foot) = work done.
Type your foot-pounds answer in your Report document.
2. Place the box on a smooth surface.
Pull the box 1 foot across a smooth desk or table.
Record the weight showing on the scales.
A. How many foot-pounds of work were done?
(Force [weight from scale reading] times the distance [1 foot] = work done.)
Type your foot-pounds answer in your Report document.
B. What is the difference between the amount of foot-pounds required to lift the box and to pull the box?
Record this difference.
C. Why is there a difference between lifting an object and pulling it across a surface?
Clue: What force are you working against when you lift the object?
3. Find another object to lift and pull with the spring scale. Write the difference in foot-pounds between lifting and pulling.
a. lifting
b. pulling
c. difference
d. Write your conclusions from both experiments in your own words.
Answer:
the answer is c
Explanation:
i took the test
A sample of nitrogen gas contains 9.46x10^23 atoms of nitrogen. How much nitrogen is expressed in grams? round your answer to the nearest whole number.
We know
[tex]\boxed{\star{\sf No\;of\:atoms=No\:of\: moles\times Avagadro's\: number}}[/tex]
[tex]\\ \rm\Rrightarrow No\:of\;moles=\dfrac{No\:of\:atoms}{Avagadro's\:no}[/tex]
[tex]\\ \rm\Rrightarrow No\:of\:moles =\dfrac{9.46\times 10^{23}}{6.022\times 10^{23}}[/tex]
[tex]\\ \rm\Rrightarrow No\:of\:moles=1.6mol[/tex]
Again
[tex]\boxed{\star{\sf Mass=Molar\:mass\times No\:of\:moles}}[/tex]
[tex]\\ \rm\Rrightarrow Mass=1.6(14)[/tex]
[tex]\\ \rm\Rrightarrow Mass=22.4g[/tex]
Why does one boil the charcoal-unknown-water mixture as opposed.
In a charcoal-water-unknown mixture, this must be boiled in opposition because the coal is insoluble, and with the heated mixture the coal can be removed.
What is the recrystallization process?It is used in the chemical sciences as a technique used to purify chemicals by heating materials to temperatures above the crystallization of each compound.
Therefore, when a component is heated, the impurities are dissolved and can be removed from the solution, generating the purification of the compound.
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