Answer:
[tex]\boxed{\text{(2) A mixture can be separated by physical means.}}[/tex]
Explanation:
For example, you can separate a mixture of sand and water by pouring it through a coffee filter.
(1) is wrong. A mixture must have at least two components.
(3) is wrong. A mixture can have a any composition depending on the amount of each component.
(4) is wrong. A mixture of sand and water is heterogeneous,
answer is #2 : a mixture can be separated by physical means
Which of the following requires the most energy to get started?
A. A nuclear fusion reaction
B. Radioactive decay
C. A chemical reaction
D. A nuclear fission reaction
Answer: it's c
Explanation:
Among nuclear fusion reaction, radioactive decay, nuclear fission reaction, and a chemical reaction, a nuclear fusion reaction requires the most energy to get started.
Explanation:Out of the options provided, a nuclear fusion reaction requires the most energy to get started. Fusion is the process where two light atomic nuclei combine to form a heavier nucleus. This process releases a tremendous amount of energy, but initiating it requires significant energy to overcome the electrostatic forces repelling the positively charged nuclei. In comparison, radioactive decay, a nuclear fission reaction, and a chemical reaction require less initial energy as they generally occur spontaneously under the right conditions.
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1. the smallest complete unit of a compound or diatomic gas shell
2. a new substance formed by the combination of two or more different atoms element
3. path of electrons around an atomic nucleus molecule
4. a substance consisting of only one type of atom compound
Answer:
Explanation:
1. The smallest complete unit of a compound or diatomic gas
ATOM
Atoms are small tiny particles that makes up a molecule. It is regarded as the smallest indivisible particle that parts in a chemical reaction.
2. A new substance formed by the combination of two or more different atoms
COMPOUNDS
Compounds are substances composed of two or more kinds of atoms. Their properties differs from those of the constituent elements that combines to make them up.
3. Path of electrons around an atomic nucleus
SHELL
The shell describes the path of an electron round a nucleus
4. A substance consisting of only one type of atom
MONOATOMIC MOLECULE
It is an aggregate of one type of atom.
Using the diameter information from the table, which answer lists the planets in the correct order, from largest to smallest?
A
Venus, Jupiter, Mercury
B
Neptune, Uranus, Mars
C
Mercury, Venus, Earth
D
Saturn, Uranus, Earth
The planets, in order from largest to smallest diameter, are ordered as follows in the options given: Saturn, Uranus, Earth. Therefore, the correct answer is D.
Explanation:The correct order of planets, from largest to smallest based on diameter, is reflected in answer option D: Saturn, Uranus, Earth. Saturn is the second largest planet, Uranus is the third largest, and Earth is the fifth largest ignoring the four smallest planets which are Neptune, Mars, Venus, and Mercury. Therefore, according to the given options, D is the most accurate listing of planets from largest to smallest based on diameter.
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Identify the location of the dorsal horn in the spinal cord
Answer:
The answer is location B
Explanation:
All spinal cord levels have a dorsal horn, which is made up of sensory nuclei that take in and interpret incoming somatosensory information. Ascending projections arise from there and carry the sensory data to the diencephalon and midbrain.
What is spinal cord ?A column of nerve fibers that extends from the skull base to the middle of the back. It has three thin membrane-like layers of protecting tissue covering it. The vertebrae encircle the spinal cord and its surrounding membranes.
At least some of the neurons in the superficial dorsal horn continue to be selective for the modalities represented by the primary afferent ends.
The dorsal horn, one of the spinal cord's divisions of grey matter, houses neurons that enter ascending sensory pathways as well as interneurons that link to other spinal cord cells. The substantial gelatinosa is present.
Thus, The initial relay for afferent impulses from the body's skin, muscles, and viscera is located in the dorsal horn of the spinal cord.
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how many moles of silver atoms are in 1.8X10^20 atoms of silver?
A. 3.0X10^-4
B. 3.3X10^-3
C. 3.0X10^2
D. 1.1X10^44
#19 in photo
PLEASE ADD WORK AND EXPLANATION
Answer:
3.0 x 10⁻⁴ moles
Explanation:
Given parameters:
Amount of Ag atoms = 1.8 x 10²⁰ atoms
Unknown:
Number of moles of Ag atoms
Solution:
From mole concept, we know that a mole of a substance contains Avogadros number of particles.
The Avogadro's number of particles is 6.02 x 10²³.
Now:
Number of moles
= number of particles/6.02 x 10²³
Therefore:
Number of moles= 1.8 x 10²⁰ / 6.02 x 10²³
Number of moles = 0.3 x 10⁻³ moles
= 3.0 x 10⁻⁴ moles
Taking into account the definition of avogadro's number, the correct answer is option A. 3×10⁻⁴ moles of silver are 1.8×10²⁰ atoms of silver.
Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.
Then you can apply the following rule of three: if 6.023×10²³ atoms are contained in 1 mole of silver, then 1.8×10²⁰ atoms are contained in how many moles of silver?
amount of moles of silver= (1.8×10²⁰ atoms × 1 mole)÷ 6.023×10²³ atoms
amount of moles of silver≅ 3×10⁻⁴ moles
Finally, the correct answer is option A. 3×10⁻⁴ moles of silver are 1.8×10²⁰ atoms of silver.
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Rob and Carla observed two trails of dogs' footprints in the mud. The spacing between the footprints in one set was markedly larger than in the other. Rob concluded that one of the dogs must have been bigger than the other. However, Carla had a different explanation.
Which is the BEST alternative to Rob's conclusion?
A) The two dogs were of different ages.
B) One of the dogs was in search of food.
C) The two dogs were of different species.
D) One of the dogs ran faster than the other.
Answer: Option (D) is the correct answer.
Explanation:
When a dog runs faster then due to more force applied by the foot there occurs large footprints of the dog.
Spaces between the feet of dog increases due to running faster as running makes an individual to take long steps.
Whereas when a dog walks normally then his footprints will be smaller in size.
Therefore, we can conclude that the BEST alternative to Rob's conclusion is that one of the dogs ran faster than the other.
26. Which waves have wavelengths longer than those of visible light? Give an example of how each kind
of wave is used.
Answer:
Infrared radiation lies between the visible and microwave portions of the electromagnetic spectrum. Infrared waves have wavelengths longer than visible and shorter than microwaves, and have frequencies which are lower than visible and higher than microwaves.
Explanation:
What type of hydrocarbon is 2-octene, and what about the structure allows 2-octene to be classified as this type of hydrocarbon?
an alkene because there is a double bond
Final answer:
2-Octene is an alkene, a type of unsaturated aliphatic hydrocarbon with a double bond between the second and third carbon atoms in its eight-carbon chain. The double bond's position is what allows us to classify it as an alkene, in line with its general formula CnH2n.
Explanation:
A hydrocarbon is defined as a compound composed entirely of hydrogen and carbon atoms. The two general types of hydrocarbons are aliphatic and aromatic hydrocarbons. Aliphatic hydrocarbons are further subdivided into alkanes, alkenes, and alkynes. Alkanes are hydrocarbons with only single bonds, alkenes contain one or more double bonds, and alkynes contain one or more triple bonds.
2-Octene is an example of an alkene, which is a type of unsaturated aliphatic hydrocarbon. The term '2-octene' indicates that the hydrocarbon has eight carbon atoms (oct-) and a double bond (--ene) between the second and third carbon atoms, as implied by the number '2' in its name. The presence of this double bond is what allows us to classify 2-octene as an alkene, and its molecular formula can be approximated as CnH2n, which fits the general formula of alkenes.
How does the sharklet film protect against bacteria?
Answer:
The sharklet film creates a phenomenon reffed to as mechanotransduction.
Explanation:
It was discovered that sharks do not experience fouling , their skin is made in a distinct manner with diamond patterns that will discourage micro organism from settling on it.
Through the process of mechanotransduction, mechanical stress is created to the bacteria whereby they cannot attach themselves to the surface because it makes them to produce more energy to settle on the surface thus they may keep off from the surface. In this manner, bacteria is inhibited from attacking these areas protected by the sharklet film.
what kind of energy is required for photosynthesis to occur
Answer:
light energy to convert carbon dioxide and water into glucose and oxygen gas. Each molecule of glucose essentially “stores” up to 38 molecules of ATP which can be broken down and used during other cellular reactions.
Explanation:
Answer:
Plants use sunlight to make glucose.
Its solar energy. Plants use the sun for energy.
Hope This Helps! Have A Nice Day!!
the volume of a gas is proportional to number of moles of a gas is known as
Answer:
A modern statement is: Avogadro's law states that, "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules." For a given mass of an ideal gas, the volume and amount (moles) of the gas are directly proportional if the temperature and pressure are constant.
Answer:
Pressure - Inversely proportional to volume.
Pressure & Volume - Directly proportional to the number of moles.
Volume - Standard is 22.4L.
Temperature - Directly proportional to the average kinetic energy. and Standard is 273K.
All - Relationship determined by Ideal Gas Law.
Gamma radiation is electromagnetic energy
True or false
Hey there! :D
This is a true statement. Gamma radiation comes from electromagnetic energy from radioactive decay. This decay has the shortest electromagnetic wave lengths and therefore has the highest photon energy. It is extremely dangerous. Radiation in general is something to be cautious of!
I hope this helps!
~kaikers
60-POINTS,5-STAR RATING, A THANKS AND MARKED AS Brainiest.
John wants to know which color of container heats water the fastest. He gets a red container, a black container and a white container and fills each with 300 ML of water. The water is at the same temperature for all three containers. He sets the containers on a bench in the sun. He records the temperature of the water in each container every 5 minutes. Each container is the same size and made of the same material.
Independent variable:
Dependent variable:
3 Constants:
Write a hypothesis for this experiment:
Answer:
Independent variable: Colour of the container
Dependent variables: The water amount and the room temperature
3 Constants: Amount of water, location of the containers and the container size.
Hypothesis: I think that the black container will heat up the water the fastest, as the colour black absorbs heat.
Hope it helps! :)
What are the advantages to star topology?
Answer:A star topology is designed with each node (like workstations, printers, laptops, servers etc.) connected directly to a central device called as a network switch. Each workstation has a cable that goes from its network card to a network switch.
Most popular and widely used LAN technology Ethernet currently operates in Star Topology.
Explanation:
The atomic number of an atom is??
Number of protons in the nucleus of an atom.
Answer:
The Atomic Number of an atom is the number of protons it contains (which are located in the nucleus of the atom).
For the reaction below, describe the temperature and pressure conditions that would produce the highest yield for the forward reaction. Explain your answer in terms of Le Châtelier's principle. (2 points)
N2(g) + 3H2(g) Two arrows stacked on top of each other. The top arrow points to the right. The bottom arrow points to the left. 2NH3(g) delta H = -92 kJ/mol
Answer:
According to Le Chatelier's Principle, low temperature and high pressure are the condition that will produce the highest yield of ammonia.
Explanation:
The Haber process is a reaction that combines nitrogen with hydrogen to form ammonia according to the following balanced equation:
N₂ ₍g₎ + 3 H₂ ₍g₎ ⇆ 2NH₃ ₍g₎ ΔH = -92 kJ/molEquilibrium considerations for Temperature changes:
You need to shift the equilibrium position as far as possible favoring the forward reaction (reaction to the right) in order to obtain the highest yield of ammonia in the equilibrium mixture. the reaction is exothermic and can be expressed as following:
N₂ ₍g₎ + 3 H₂ ₍g₎ ⇆ 2NH₃ ₍g₎ + heatIf the temperature is increased, the heat content of the system will increase, so the system would consume some of that heat by shifting the equilibrium to the left, thereby producing less ammonia.
According to Le Chatelier's Principle, the forward reaction will be favored if you lower the temperature you will get more ammonia (i.e. highest yield). The system will respond by moving the position of equilibrium to counteract this - in other words by producing more heat.
Equilibrium considerations for Pressure changes:
for the Haber process reaction
N₂ ₍g₎ + 3 H₂ ₍g₎ ⇆ 2NH₃ ₍g₎One can note that there are 4 moles on the left-hand side of the equation, but only 2 on the right.
According to Le Chatelier's Principle, if you increase the pressure the system will respond by favoring the reaction which produces fewer no. of moles. That will cause the pressure to fall again.
In order to get as much ammonia as possible in the equilibrium mixture, you need as high a pressure as possible producing more ammonia (i.e. highest yield)..
Which chemicals are major contributors to ozone layer destruction? Select two answer choices.
phosphorus
nitrogen
bromine
chlorine
carbon dioxide
methane
Answer:
Chlorine and bromine
Explanation: The chlorine and bromine acts as reactive gases and destroy the ozone present in the stratospheric ozone.
The ozone layer is present in the stratosphere to filter the harmful rays of the sun that is harmful for the people living on earth.
A chlorine or bromine molecule can destroy thousand of the ozone molecules before it leaves the stratosphere.
So, a single bromine or chlorine atom can affect the ozone layer.
Bromine and chlorine are major contributors to ozone layer destruction. The correct answer is bromine and chlorine.
The ozone layer, which is located in the stratosphere, plays a crucial role in protecting life on Earth by absorbing harmful ultraviolet (UV) radiation from the sun.
Certain chemicals have been identified as major contributors to the depletion of this layer.
These chemicals contain halogens, specifically chlorine and bromine, which are highly reactive and can destroy ozone molecules through a series of catalytic reactions.
Chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) are the primary sources of chlorine in the stratosphere.
When these compounds reach the stratosphere, they are broken down by UV radiation, releasing chlorine atoms.
Each chlorine atom can destroy thousands of ozone molecules in a catalytic cycle that does not consume the chlorine atom, allowing it to continue depleting ozone.
Similarly, halons, which contain bromine, are another group of chemicals that contribute significantly to ozone depletion.
Bromine is even more efficient at destroying ozone than chlorine, making halons particularly harmful to the ozone layer.
Phosphorus, nitrogen, carbon dioxide, and methane are not directly involved in the catalytic destruction of ozone in the same way as chlorine and bromine.
While nitrogen oxides (NOx) can participate in ozone destruction cycles, they are not considered major contributors compared to chlorine and bromine from CFCs, HCFCs, and halons.
Carbon dioxide and methane are greenhouse gases that contribute to global warming and climate change, but they do not directly destroy ozone molecules in the stratosphere.
Therefore, the two chemicals that are major contributors to ozone layer destruction are chlorine and bromine.
While skateboarding at 19 km/h, Alana throws a tennis ball at 11 km/h to her friend Oliver. If Alana is the reference frame,
the speed of the tennis ball is
km/h
Answer:
11 km/hr
Explanation:
Taking Alana as the reference frame, we consider the speed with which the ball gets away from her. Therefore the speed given will be with respect to Alana. In this case we disregard the 19 km/hr as it is common to both Alana and the ball.
Answer:
Speed, v = 30 km/h
Explanation:
It is given that,
Speed while skateboarding, v₁ = 19 km/h
Speed with which tennis ball is thrown, v₂ = 11 km/h
We have to find the speed of the tennis ball from the Alana's frame of reference.
v = v₁ +v₂
v = 19 km/h + 11 km/h
v = 30 km/h
Hence, this is the required solution.
What is the mass of 3.2 moles of h2O ?
Answer:
[tex]\boxed{\text{57.7 g} }[/tex]
Explanation:
The first step is to calculate the molar mass of H₂O:
[tex]\begin{array}{rcr}\text{2 H} & = & 2.02\\\text{1 O} & = & 16.00\\\text{TOTAL} & = & \mathbf{18.02}\\\end{array}[/tex]
So, 1 mol has a mass of 18.02 g.
Next you calculate the mass of 3.2 mol of H₂O
[tex]\begin{array}{rcl}m & = & \text{3.2 mol H$_{2}$O} \times \dfrac{\text{18.02 g H$_{2}$O}}{\text{1 mol H$_{2}$O}}\\ & = &\boxed{\textbf{57.7 g H$_{2}$O}} \\\end{array}[/tex]
The mass of 3.2 moles of H₂O is calculated by multiplying the number of moles by the molar mass of water, which is 18.015 g/mol, giving a total mass of 57.648 grams.
Explanation:The mass of 3.2 moles of H₂O can be calculated using its molar mass. The molar mass of water (H₂O) is 18.015 g/mol, calculated by summing the molar masses of each atom in the molecule: (1.0079 + 1.0079 + 15.999).
To find the mass, simply multiply the number of moles by the molar mass:
Mass = Moles × Molar Mass
Mass = 3.2 moles × 18.015 g/mol = 57.648 g
This result gives you the mass of water for the given moles.
What is the charge of the neutron
Answer:
Neutral (no net charge)
Explanation:
Protons - Positive
Electrons - Negative
Neutrons - No charge
Why?
Neutrons are the particle in an atom with a (as the name suggests) neutral charge. They are neither positive nor negative, unlike protons or electrons.
Describe a structure of a ecosystem
Answer:
"Ecosystem is the major ecological unit. It has both structure and functions. The structure is related to species diversity. The more complex is the structure the greater is the diversity of the species in the ecosystem. The functions of ecosystem are related to the flow of energy and cycling of materials through structural components of the ecosystem."
Explanation:
Which statements are correct about silicon?
A metalloid
B atomic number is 28
C atomic weight is 14
D has similar properties as Al and P
E has similar properties as Ge
F belongs to Period 3
Answer:
A. Metalloid
E. Has similar properties as Ge
F. Belongs to Period 3
Explanation:
Silicon is the 14th element on the periodic table. Its unit is SI. Its properties straddles between those of metals and non-metals and it is described as a non-metal.
It's atomic weight or mass number is 28u. It has an atomic number of 14 i.e in its neutral state, the number of protons and electrons are equal to 14.
Silicon belongs to the 4th group and the 3rd period on the periodic table. Elements in the same group share similar chemical properties. The elements in Si group are: C, Ge, Sn and Pb. The properties of Si is similar to these elements because they all have a valency of 4. Across the period, the properties varies this is why Si would have a very different property from Al and P.
How would 0.073 be written in scientific notation
Answer:
7.3
⋅
10
−
2
Explanation:
Answer:yo yo
Explanation:
123
An automobile tire at 30°C has a pressure of 3.00 atm. Temperature decreases to -5°C. Assume that there is no volume change in the tire.
What is the new pressure of the tire after the temperature change?
? atm
Answer:
2.65 atm.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
If n and V are constant, and have different values of P and T:(P₁T₂) = (P₂T₁).
P₁ = 3.0 atm, T₁ = 30°C + 273 = 303 K,
P₂ = ??? atm, T₂ = -5°C + 273 = 268 K.
∴ P₂ = (P₁T₂)/(T₁) = (3.0 atm)(268 K)/(303 K) = 2.65 atm.
Which is the first element in the periodic table to have an electron configuration in the 4th energy level? beryllium carbon potassium titanium
titanium electronic configuration
3d2 4S2
Answer:
The answer is: Potassium because is the first element in period four.
Explanation:
Ok, the electron configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals. Since 1s can only hold two electrons, the next 2 electrons are in the 2s orbital. Then put six in the 2p orbital and put the next two electrons in the 3s. Now, move to the 3p where it is place the next six electrons. Then shift to the 4s orbital where we place the remaining one electron. Therefore the Potassium electron configuration will be:
[tex]1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{1}[/tex]
HELP ASAP! GIVING BRAINLIEST!! 15 POINTS
Think about the process of raising a pendulum to one side and letting it go. For this event, create a list associated with the pendulum as it cycles from the choices below:
KINETIC ENERGY FORMS:
- Motion energy
- Thermal energy
- Electric energy
- Vibrational energy
- Radiant energy
POTENTIAL ENERGY FORMS:
- Gravitational Potential energy
- Elastic Potential energy
- Chemical Potential energy
- Electric Potential energy
- Magnetic Potential Energy
- Nuclear Potential energy
Answer:
1. Potential energy
2. Potential and kinetic energy
3. Kinetic energy
4. Potential and kinetic energy
5. Potential energy
Explanation:
As shown in picture <3 !!
The list associated with a pendulum as it cycles from the choices below are:
1. Potential energy.
2. Potential and kinetic energy.
3. Kinetic energy.
4. Potential and kinetic energy.
5. Potential energy.
What is potential and kinetic energy?Potential energy is the energy that is the saved in the still state of any object or stored form of energy before it starts to motion.
The kinetic energy is the energy used to perform any work or the energy used when any object is in motion.
Thus, the correct options are 1. Potential energy., 2. Potential and kinetic energy.3. Kinetic energy., 4. Potential and kinetic energy., 5. Potential energy.
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how many grams of carbon dioxide would be formed if 38.9 g of C2H2 reacted completely with oxygen
Answer:
131.7 grams of carbon dioxide would be formed
Explanation:
2C₂H₂ + 5O₂ = 4CO₂ + 2H₂O
m(CO₂)/{4M(CO₂)} = m(C₂H₂)/{2M(C₂H₂)}
m(CO₂)=2M(CO₂)m(C₂H₂)/M(C₂H₂)
m(CO₂)=2*44g/mol*38.9g/26g/mol = 131.7 g
131.7 grams of carbon dioxide would be formed
Answer: The mass of carbon dioxide produced in the given reaction is 132 grams.
Explanation:
To calculate the number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] .....(1)
For ethyne:Given mass of ethyne = 38.9 g
Molar mass of ethyne = 26 g/mol
Putting values in equation 1, we get:
[tex]\text{Moles of ethyne}=\frac{38.9g}{26g/mol}=1.5mol[/tex]
The chemical reaction for the combustion of ethyne follows the equation:[tex]2C_2H_2+5O_2\rightarrow 4CO_2+2H_2O[/tex]
By Stoichiometry of the reaction:
2 moles of ethyne produces 4 moles of carbon dioxide.
So, 1.5 moles of ethyne will produce = [tex]\frac{4}{2}\times 1.5=3mol[/tex] of carbon dioxide.
Now, calculating the mass of carbon dioxide from equation 1, we get:Molar mass of carbon dioxide = 44 g/mol
Moles of carbon dioxide = 3 moles
Putting values in equation 1, we get:
[tex]3mol=\frac{\text{Mass of carbon dioxide}}{44g/mol}\\\\\text{Mass of carbon dioxide}=132g[/tex]
Hence, the mass of carbon dioxide produced in the given reaction is 132 grams.
Ethene reacting with hydrogen gas would produce...
Your answer:
propane
ethane
ethyne
Answer:
Ethene reacting with hydrogen gas would produce ethane .
Explanation:
Hydrogenation of alkene gives alkane.
Hydrogenation of ethene gives the saturated hydrocarbon "ethane".
According to the equation:
C₂H₄ + H₂ → C₂H₆.
If a temperature increases by (2x + 1)ºC from the original x, in x + 5 seconds, then the average rate of change is (x - 3) C/s.
Which is a possible value of x?
A) 2
B)4
C)8
D)16
Answer:
x=4 or B
Explanation:
It says that the increase in temperature is (2x+1) and that is within (x+5) seconds. Therefore, (2x+1)/(x+5)=(x-3). X then equals 4, or -4. Therefore, the answer is 4, or B.
A possible value of x = B)4
Further explanationThe main composition of algebraic expressions are:
1. phrasesalgebraic forms separated by arithmetic operations
consists of one phrase (monomial) to many phrases (polynomial)
2. variableis a value that can be changed, can be in the form of letters, for example, x, y, a, b, etc.
3. constantsis a fixed value, can be a number
4. arithmetic operations+, -,:, x
The Average Rate of Change of a function shows the comparison between 2 objects that change
If we use the notation function, the Average rate of Change of a function from a to b can be formulated as:
[tex] \large {\boxed {\boxed {\bold {ROC = \frac {f (a) -f (b)} {a-b}}}} [/tex]
ROC = rate of change
a temperature increases by (2x + 1) ºC from the original x, in x + 5 seconds, then the average rate of change is (x - 3) C / s.
There are 2 functions that change, temperature and time
If we change above statement to algebraic form, it becomes
[tex]\rm ROC=\dfrac{\Delta temperature}{\Delta time}\\\\x-3=\dfrac{2x+1}{x+5}\\\\(x-3)(x+5)=2x+1\\\\x^2+2x-15=2x+1\Rightarrow combine\:like\:terms\\\\x^2+2x-2x-15-1=0\\\\x^2-16=0\\\\(x+4)(x-4)=0\\\\x=4,x=-4\Rightarrow use\:positive\:value\:x=4[/tex]
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Which of the following statements about enthalpy is true?
Enthalpy of a substance can be measured directly.
A chemical process must occur and then changes between the state of the reactants and the state of the products can be determined.
Enthalpy is the gradual decline into disorder.
Enthalpy is a measure of the change in pressure of a system.
Answer: A chemical process must occur and then changes between the state of the reactants and the state of the products can be determined
Explanation: Enthalpy represents the sum of the energy of the system with the product of the pressure and volume of that system. As a thermodynamic property, it expresses the ability to release heat from the system. In fact, enthalpy tells us how much heat and work has changed during the chemical reaction under constant pressure. When measuring, measurements of the difference in enthalpy between the two states of the system is performed, before and after the chemical reaction, since total enthalpy can not be measured. This measurement of the enthalpy change can tell us, for example, whether the heat was released from the system during the reaction, or the system absorbed the heat.
Answer:
B.
Explanation: