Select the correct answer.
A substance is followed by the symbol (1) in a chemical equation. What does the symbol represent?
OA. The substance has the least molecules in the equation.
OB. The substance is in the liquid state.
O c.
The substance is produced last in the reaction.
O D.
The substance is dissolved in a liquid solution.
O E. The substance is lost at the end of the reaction.
The symbol l represents the substance is in the liquid state. The correct option is B.
The symbol (l) in a chemical equation indicates that the substance is in the liquid state.
This is important to know because the physical state of a substance can affect its properties and how it behaves in a chemical reaction.
For example, a liquid may have a different density or viscosity than a solid or gas, and this can impact how quickly it reacts with other substances or how it mixes with other liquids.
Therefore, including the (l) symbol in a chemical equation can provide important information about the state of the substances involved. The correct option is B.
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NEED HELP ON QUESTION ASAP! !
If answer is correct I'll rate you five stars a thanks and maybe even brainliest!
Please can you explain what this paragraph is trying to say. Also what does it mean in the sentence 'the difference in charge across the battery provides push for current' and what is the difference in charge.
Here's paragraph I need to have a simple definition of:
A high waterfall is also like a large voltage. It will transfer a lot of energy to the water (charge), making the river flow very fast (a large current) the difference in height makes the river flow. In a circuit , the difference in charge across battery provides push for the current.
A waterfall is a river's water falling rapidly to the ground. It is created in a river's upper course where there are high mountains.
Thus, Many waterfalls are transient and only occur during rainstorms because of their location in the landscape, where they are often over bedrock and fed by a small contributing region.
For general knowledge, we are listing the "Top 10 Highest Waterfalls in India" here. The Kunchikal Falls are the second-highest waterfall in Asia and the highest in all of India.
The waterfall, which is close to Agumbe in Karnataka's Shimoga district, has a height of 1,493 feet. The Varahi River creates the biggest waterfall. The sole permanent rain forest research is located in Agumbe Valley, one of India's most heavily rained-on regions.
Thus, A waterfall is a river's water falling rapidly to the ground. It is created in a river's upper course where there are high mountains.
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20. What is the pOH for a solution with a pH of 5.02?
A sample of an unknown compound is vaporized at 160 c . The gas produced has a volume of 2330 ml at a pressure of 1.00 atm ,and it weighs 2.10 g
Round answer to 3 significants digits
The molar mass is 3230.8 g/mol
How to determine the valueFirst, we need to know that the formula for the general gas law is represented as;
PV = nRT
such that the parameters are;
P is the pressureV is the volumen is the number of molesR is the gas constantT is the temperatureSubstitute the values
1 × 2.33 = n × 8.314 × 433.15
Multiply the values, we get;
n = 2.33/ 8.314 × 433.15
Divide the values
n = 6.5 × 10⁻⁴ moles
But, number of moles = mass/molar mass
Molar mass = 2.10/ 6.5 × 10⁻⁴
Molar mass = 3230.8 g/mol
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Which of the following statements is not considered need for life to exist on another planet?
There should be an acceptable temperature tang for molecule to move
There needs to be a source for minerals and other nutrients
The atmosphere should be dense enough to not maintain warmth but also shield from solar radiation
The should be a reliable source of energy
Plants will be need to present to perform photosynthesis
Water needs to be in a liquid form for cells to utilize it
The most important parameter for earth like life is the presence of liquid water, which directly depends on pressure and temperature. Plants will be need to present to perform photosynthesis is not an essential condition. The correct option is E.
We need water, shelter, a power source, food, and unlike on earth, you need oxygen. No other planets in our solar system can support life. To get oxygen you have to have billions of plants and need suitable temperature for plants.
There is no life on earth that can survive without water. The planet must have a nitrogen, oxygen atmosphere without any gases that could be toxic to humans.
Thus the correct option is E.
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What did Henri Matisse describe as the modern concepts of artistic expression in his Notes of a Painter (1908)?
Henri Matisse talked about new ideas in creative expression that he thought were emerging at the moment as well as his vision for modern art.
The use of color and shape to convey emotion, according to Matisse, should take the place of the conventional representational approach that sought to mimic the real world. He held that artists should be allowed the freedom to interpret the world in light of their personal experiences and that contemporary art was really about individual expression.
Matisse believed that contemporary artists should aim for simplicity and clarity in their work, distilling the natural world down to its most basic components. To achieve a sense of coherence in entire composition, he emphasised on significance of balance and harmony in the use of color and shape. Overall, "Notes of a Painter" contributed to the development of the modernist movement in art, which emphasised the value of creativity and individual expression
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How much heat energy is absorbed when 132 g of ice melts
Explanation:
To calculate how much heat energy is absorbed when 132 g of ice melts, we need to know the heat of fusion for ice, which is the energy required to change the ice from solid to liquid without changing its temperature. The heat of fusion of ice is 334 joules per gram. Using this information, we can calculate how much heat energy is absorbed when the ice melts:
q = mass × heat of fusion
q = 132 g × 334 J/g
q = 44,088 J
So, 44,088 joules of heat energy are absorbed when 132 g of ice melts.
If a 300.0 mL sample of a gas is heated at constant pressure from 25.0ºC to 55.0ºC, its new volume is ___ mL?
The new volume of the gas at 55.0ºC is 330.7 mL (rounded to three significant figures).
Assuming the gas behaves ideally, we can use the following formula to calculate the new volume of the gas:
V₂ = V₁ * (T₂/T₁)
Where:
V₁ is the initial volume of the gas at temperature T₁
T₁ is the initial temperature of the gas
V₂ is the new volume of the gas at temperature T₂
T₂ is the final temperature of the gas
We are given:
V₁ = 300.0 mL
T₁ = 25.0ºC = 298.15 K
T₂ = 55.0ºC = 328.15 K
Substituting the values into the formula, we get:
V₂ = 300.0 mL * (328.15 K / 298.15 K)
V₂ = 330.7 mL
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Can someone please do this for me? Thank you!!
Answer:
1.) F 2.) F 3.) T 4.) T 5.) T 6.) F 7.) F 8.) F
Explanation:
A system gains 732 kJ of heat, resulting in a change in internal energy of the system equal to +196 kJ. How much work is done in kJ?
The work done by the system is +536 kJ.
To determine the work done by the system, we can use the first law of thermodynamics, which states that the change in internal energy (ΔU) of a system is equal to the heat (Q) added to the system minus the work (W) done by the system:
ΔU = Q - W
Given that the change in internal energy (ΔU) is +196 kJ (positive indicates an increase in internal energy) and the heat (Q) added to the system is +732 kJ, we can substitute these values into the equation:
+196 kJ = +732 kJ - W
Rearranging the equation to solve for W:
W = Q - ΔU
W = +732 kJ - (+196 kJ)
W = +732 kJ - 196 kJ
W = +536 kJ
The positive sign indicates that work is done on the system, meaning energy is transferred into the system. In this case, the system gains 732 kJ of heat, and an additional 536 kJ of work is done on the system, resulting in a total increase in internal energy of +196 kJ.
It's important to note that the units for heat, work, and internal energy are all in kilojoules (kJ), which is the standard unit for energy in thermodynamics.
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If 2.5 moles of CO2 is made from the reaction, how many moles of h2o is produced?
Answer:
The balanced chemical equation for the reaction of CO2 and H2 to produce H2O and CO is:
CO2 + 4H2 -> CH4 + 2H2O
From the equation, we can see that for every 1 mole of CO2 reacted, 2 moles of H2O are produced. Therefore, if 2.5 moles of CO2 are produced, the number of moles of H2O produced would be:
2.5 moles CO2 * (2 moles H2O / 1 mole CO2) = 5 moles H2O
Therefore, 5 moles of H2O would be produced when 2.5 moles of CO2 is produced.
Given that the initial rate constant is 0.0120s−1 at an initial temperature of 29 ∘C , what would the rate constant be at a temperature of 160 ∘C for the same reaction described in Part A?
Model B
Which statement best explains how the models differ?
Model A shows the formation of ions, and model B does not show the formation of ions.
Model A does not show the formation of ions, and model B shows the sharing of electrons.
Model A shows the sharing of electrons, and model B shows the formation of ions.
Model A shows the transfer of an electron, and model B shows the sharing of electrons.
Mark this and return
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Answer:
Model A shows the formation of ions, and model B shows the sharing of electrons.
Determine whether the following five molecules are polar or nonpolar and explain your answer:
a) Beryllium chloride b) Hydrogen sulphide c) Sulphur trioxide d) Water e) Trichloromethane
The following are categorized into polar or nonpolar molecules:
a) Beryllium chloride - nonpolar b) Hydrogen sulphide - polar c) Sulphur trioxide - nonpolar d) Water - polar e) Trichloromethane - polar How to determine polar or nonpolar?a) Beryllium chloride (BeCl₂) is a nonpolar molecule. The Be-Cl bond is polar due to the electronegativity difference between beryllium and chlorine, but the molecule is linear with the two polar bonds pointing in opposite directions, resulting in a net dipole moment of zero.
b) Hydrogen sulphide (H₂S) is a polar molecule. The H-S bond is polar due to the electronegativity difference between hydrogen and sulfur, and the molecule has a bent shape, resulting in a net dipole moment that is not zero.
c) Sulphur trioxide (SO₃) is a nonpolar molecule. The S-O bonds are polar due to the electronegativity difference between sulfur and oxygen, but the molecule is trigonal planar with the three polar bonds pointing in different directions, resulting in a net dipole moment of zero.
d) Water (H₂O) is a polar molecule. The H-O bond is polar due to the electronegativity difference between hydrogen and oxygen, and the molecule has a bent shape, resulting in a net dipole moment that is not zero.
e) Trichloromethane (CHCl₃) is a polar molecule. The C-Cl bonds are polar due to the electronegativity difference between carbon and chlorine, and the molecule has a tetrahedral shape, resulting in a net dipole moment that is not zero.
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The four lines observed in the visible emission spectrum of hydrogen gas tell us that: a. The hydrogen molecules they came from have the formula H4 b. Only certain energies are allowed for the electron in a hydrogen atom We could observe more lines if we had a stronger prism C. d. There are four electrons in an excited hydrogen atom The spectrum is continuous
The four lines observed in the visible emission spectrum of hydrogen gas tell us that (b) Only certain energies are allowed for the electron in a hydrogen atom.
The observed lines in the hydrogen spectrum correspond to specific energy transitions of the electron within the hydrogen atom. These transitions occur when the electron moves between different energy levels within the atom. Each line represents a specific energy difference between two energy levels, and the wavelengths of these lines correspond to different colors in the visible spectrum.
The observed spectral lines provide evidence for the quantized nature of energy levels in hydrogen. According to quantum mechanics, electrons in atoms can only occupy certain discrete energy levels. The emission lines in the hydrogen spectrum indicate that the electron in a hydrogen atom can only exist in specific energy states, and it transitions between these states by either emitting or absorbing energy in the form of photons. The other options in your statement are incorrect:
a. The hydrogen molecules they came from have the formula H4: The hydrogen spectrum is related to the behavior of individual hydrogen atoms, not hydrogen molecules. Hydrogen molecules (H2) have different energy levels and do not produce the observed spectral lines.
c. We could observe more lines if we had a stronger prism: The number and position of the spectral lines in the hydrogen spectrum are determined by the energy differences between the electron energy levels. The strength of the prism or the spectroscopic instrument does not affect the number of observed lines. However, a higher-resolution instrument may allow for more precise measurement of the wavelengths of the lines.
d. There are four electrons in an excited hydrogen atom: A hydrogen atom normally contains only one electron. The number of observed spectral lines does not provide information about the total number of electrons in the atom.
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what pressure would 1.75 L of disulfur monoxide gas have if it occupied a volume of 16.60 L at 1 atm?
Okay, let's solve this step-by-step:
* We are given that the initial volume of the gas is 1.75 L at 1 atm pressure
* We want to know the pressure if the volume increases to 16.60 L
* According to Boyle's Law: Pressure x Volume = Constant
* Since the initial pressure is 1 atm and volume is 1.75 L, the constant is:
1 atm x 1.75 L = 1.75 atm*L
* When the volume increases to 16.60 L, plugging into Boyle's Law:
P x 16.60 L = 1.75 atm*L
* Solving for P (pressure):
P = 1.75 atm*L / 16.60 L
P = 0.105 atm
Therefore, the pressure of the 1.75 L of disulfur monoxide gas if it occupied a volume of 16.60 L would be 0.105 atm.
Which characteristic of a livable exoplanet does the image below support?
A. The planet needs have an acceptable surface composition
B. The planets needs to have reliable source of energy
C. The planet needs to have liquid water available
D. The planet needs to have an atmosphere to retain heat and reflect solar radiation
The image below shows a exoplanet with a blue hue, which is indicative of the presence of liquid water on its surface. This characteristic supports option C, which states that a livable exoplanet needs to have liquid water available.
The correct answer is option C.
Water is an essential component of life as we know it, and its presence is a key indicator of a planet's potential habitability. Without liquid water, it would be impossible for life to survive on a planet. However, it is important to note that liquid water alone is not sufficient for a planet to be considered livable. The planet also needs to have an acceptable surface composition, a reliable source of energy, and an atmosphere to retain heat and reflect solar radiation. Therefore, while the presence of liquid water on the exoplanet in the image is a positive sign, further investigation would be required to determine if it meets all the other criteria for being a livable exoplanet.
The correct answer is option C.
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2A+2b+2c rate law for this reaction?
Rate =[tex]k[A]^2[B]^2[C]^2[/tex] with an overall reaction order of 6.
The rate law for a chemical reaction expresses the relationship between the rate of the reaction and the concentrations of the reactants. In the given reaction, 2A + 2B + 2C, the general rate law expression can be written as:
Rate =[tex]k[A]^a[B]^b[C]^c[/tex]
However, since the coefficients in the balanced chemical equation represent the stoichiometric coefficients, they can also be used as the exponents in the rate law expression. Therefore, the rate law for the given reaction would be:
Rate =[tex]k[A]^2[B]^2[C]^2[/tex]
Here, a = 2, b = 2, and c = 2 represent the exponents corresponding to the reactants A, B, and C, respectively. The overall order of the reaction is determined by adding the exponents:
Overall reaction order = a + b + c = 2 + 2 + 2 = 6
Hence, the rate law for the reaction 2A + 2B + 2C would be:
Rate =[tex]k[A]^2[B]^2[C]^2[/tex] with an overall reaction order of 6.
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if the body is moving with uniform acceleration then, eng of motion are given as s = u+v/2+t
Yes, s = u+v/2+t, where s is the displacement, u is the beginning velocity, v is the end velocity, and t is the time required, is the equation of motion for a body travelling with uniform acceleration.
The basic law of motion, which states that a body's rate of change in displacement is directly proportional to its velocity, provides the basis for this equation. The equation of motion for a body travelling with constant acceleration, s = ut + 1/2at2, may be used to derive it.
The equation of motion for a body travelling with uniform acceleration is given by replacing the value of an as (v-u)/t and getting s = u+v/2+t. This formula is only accurate when the body's acceleration is constant and uniform.
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How does carbon enter the soil? O used to make shells and bones O dissolves from the atmosphere O decomposition of plant and animal material O photosynthesis converts it into sugars
Photosynthesis is a process by which plants convert light energy into chemical energy which is later used to carry out cellular activities. The carbon enter into the soil through photosynthesis. The correct option is D.
Through the process of photosynthesis, plants assimilate carbon and return some of it to the atmosphere through respiration. The carbon that remains as plant tissue is then used by animals or added to the soil as litter when plants die and decompose.
The carbon dioxide molecules are captured by the plants and are changed into organic matter. The plants keep the carbon and respire the oxygen.
Thus the correct option is D.
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Acids other than HBr can add to alkenes. Based on the reaction with HBr, draw products for the following reactions.
The products of reaction are 2-iodo-2-methyl propane and 2-chloro-2-methyl propane.
Alkenes exhibit wide range of electrophilic addition reactions. Addition of hydrogen halides such as hydrogen bromide and hydrogen chloride is an example of electrophilic addition reactions of alkenes. The general trend of hydrogen halide is given as: HI >HBr> HCl.
In the electrophilic addition, the initial step is to attack an electrophile on the carbon-carbon double bond, which exerts a set of electrons. This step is known as the deprotonation step. This forms a carbocation.
In the next step, the halide will get attached to the carbocation, which results in original hydrogen bonds.
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Draw the product of condensation to form a peptide bond. Identify the new peptide bond.
Covalent bonds between two amino acids are known as peptide bonds. Proteins are large chains of amino acids that are created by living things using peptide bonds.
Thus, In addition to providing structural support, initiating significant reactions, and identifying chemicals in the environment, proteins have a variety of other activities.
Therefore, the majority of biological responses are based on peptide bonds.
Dehydration process results in the formation of a peptide bond. As can be seen in the figure below, when two hydrogens and an oxygen are taken out of the molecules, two amino acids can bind together.
Thus, Covalent bonds between two amino acids are known as peptide bonds. Proteins are large chains of amino acids that are created by living things using peptide bonds.
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Can someone please help me with this? Thank you for your help!
The correct answer for 1 is that the formation of liquid droplets above the solution is not an indication that a chemical reaction has occurred, which is option a. The formation of the silvery metal is an example of which of the following indicators of precipitate formation which is in option c .
The formation of liquid droplets above the solution is not an indication of a chemical reaction because it is likely caused by a physical process rather than a chemical one. As the liquid in the flask evaporates due to the warmth of the sunlight, water vapor rises and then cools as it reaches the cooler surface of the glass. This causes it to condense back into liquid droplets above the solution. This process is called condensation and is a physical change that occurs due to changes in temperature and pressure.
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BaS(0) +202(g) = BaSO4 Effects of increasing Oxygen on the amount of barium sulphate
Increasing the amount of oxygen in the reaction would result in an increased yield of barium sulfate, as long as there is an adequate supply of barium sulfide.
In the given chemical equation, the reaction between barium sulfide (BaS) and oxygen gas (O2) produces barium sulfate (BaSO4).
When the amount of oxygen is increased in the reaction, it would favor the production of more barium sulfate. This is because oxygen acts as a reactant in the formation of barium sulfate. By increasing the concentration or availability of oxygen, more oxygen molecules will be available to react with the barium sulfide. The increase in oxygen will provide more oxygen atoms for the formation of sulfate ions (SO4^2-) from the sulfide ions (S^2-) in barium sulfide. Consequently, more barium sulfate will be produced in the reaction. Therefore, increasing the amount of oxygen in the reaction would result in an increased yield of barium sulfate, as long as there is an adequate supply of barium sulfide.
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1 answer
.....................................
Answer:
Signal noise will reduce the information in the transmitted signal.
Explanation:
Signal noise is the most likely factor that will reduce the information in a transmitted signal because:
Signal noise is any unwanted interference that degrades a communication signal.Signal noise can interfere with both analog and digital signals, and it can cause distortion of the signal, which can lead to errors in the information that is being transmitted.NEED HELP ASAP PLEASEEE
Carbon has the highest melting point (3620°C) of any element and a specific heat of 0.7099 J/gºC. Tungsten has a specific heat of 0.1320 J/gºC. An 11.2g sample of carbon is heated to its melting point and allowed to radiate heat to a 165.3g sample of tungsten. The initial temperature of the tungsten is 31.0°C. What will be the final temperature of the tungsten?
Please show it step by step
Answer:
c. 11.2
Explanation:
The same amount of nitrogen gas is in both containers. The pressure in container A is
The pressure in container A depends on various factors, such as the volume of the container, the temperature of the gas, and the number of gas molecules present. However, without specific values or conditions provided, it is difficult to provide an exact answer.
In general, the pressure of a gas is directly proportional to the number of gas molecules present and the temperature, while inversely proportional to the volume of the container.
If the volume, temperature, and number of nitrogen gas molecules are the same in both containers, then the pressure in container A would be the same as the pressure in the other container.
It's important to note that pressure is typically measured in units such as pascals (Pa) or atmospheres (atm), and specific values would be needed to calculate the exact pressure in container A.
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A sample of water weighing 523g is cooled by 23C. Calculate the q value for this process.
Answer:
The q value for this process is -241.69 kJ.
Explanation:
To calculate the q value, we need to use the equation:
q = m * c * ΔT
where:
q is the heat energy absorbed or released,
m is the mass of the substance,
c is the specific heat capacity of the substance,
ΔT is the change in temperature.
In this case, the mass of the water (m) is given as 0.523 kg, the change in temperature (ΔT) is 23°C, and the specific heat capacity of water (c) is approximately 4.18 kJ/kg°C.
Substituting the values into the equation:
q = 0.523 kg * 4.18 kJ/kg°C * 23°C
q = 5.46 kJ * 23°C
q = -125.58 kJ
The negative sign indicates that heat is being released from the water as it cools. Therefore, the q value for this process is -125.58 kJ or approximately -241.69 kJ (rounded to two decimal places).
What volume (in mL) of a 0.150 M solution of sodium hydroxide is needed to react
completely with 45 mL of a 0.250 M solution of H₂SO4?
2 NaOH(aq) + H₂SO4(aq) →→→ Na₂SO4(aq) + 2 H₂O(1)
O 5.6 mL
O 37.5 mL
O 150 mL
O22.5 mL
O 11.3 mL
Answer:
150 mL
Explanation:
Recall that
[tex]Molarity = \frac{moles}{volume}[/tex]
Now, we are given a Molarity of 0.250 M H2SO4 with a volume of 45 mL. We will convert this to moles
[tex]mol = \frac{M}{L}[/tex]
Then, since the mole ratio from H2SO4 to NAOH is 1:2, we will multiply by 2
Finally, we will get the volume by dividing by the Molarity of NaOH which is 0.150 M.
The setup for the answer is as follow
[tex](0.25 M H_2SO_4)(45 mL H_2SO_4)(\frac{2 mol NaOH}{1 mol H_2SO_4} )(\frac{1}{0.15MNaOH})[/tex]
The final answer is 0.150 L or 150 mL.
hello, can you help me identify the name of these 4 molecules as well as the structural formula and the skeletal formula? thank you
Answer:1. metyletevinyl
4. (Z)-3-hydroxypropenal
Explanation:
