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Question 4 of 20:
Select the best answer for the question.
4. Which of the following accurately pairs the part of an atom to its charge?
O A. Electron-no charge
O B. Electron-negative charge
OC. Neutron-positive charge
O D. Proton-no charge
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Calculate the distance Jupiter in miles if it has an AU of 5.2
93,000,000 miles
O 465,400,000 miles
O 483, 600, 000 miles
When a conditions could exist: liquid is in dynamic equilibrium with its vapor at a given temperature, the following
(I) There is no transfer of molecules between liquid and vapor
(II) The vapor pressure has a unique value
(III) The opposing processes, (liquid to vapor) and (vapor to liquid), proceed at equal rates
(IV) The concentration of vapor is dependent on time
Which of the above choices are applicable?
a. I
b. II and III
c. I, II, and III
d. II and IV
e. none of these combination
In dynamic equilibrium conditions, the vapor pressure is unique, and the rate of vaporization and condensation are at equal rates. Thus, option b is accurate.
What is dynamic equilibrium?A dynamic equilibrium is a reaction state where the rate of the forward and the backward reaction are equal. In the above case, the vapourization and the condensation will occur simultaneously at the same rate.
The vapor pressure of the liquid to gas and vice versa has a distinctive value as the temperatures are different making the pressure change directly.
Therefore, option b. II and III are the correct options.
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Determine the value of Kc for the following reaction, if the equilibrium concentrations are as follows: [N2]eq = 2.66 M, [H2]eq = 0.64 M, [NH3]eq = 3.34 M.
N2(g) + 3 H2(g) ⇌ 2 NH3(g)
The value of Kc for the given reaction is 0.0579 (rounded to four decimal places).
The formula for the equilibrium constant, Kc, of a reaction is given by the ratio of the product of the concentrations of the products raised to their respective stoichiometric coefficients to the product of the concentrations of the reactants raised to their respective stoichiometric coefficients.
The stoichiometric coefficients are the coefficients in the balanced chemical equation.
To determine the value of Kc for the reaction given by the following chemical equation:N2(g) + 3 H2(g) ⇌ 2 NH3(g)
we first need to write the expression for Kc.
The expression for Kc is given by the following formula:Kc = [NH3]² / [N2][H2]³.
We are given the equilibrium concentrations as follows:[N2]eq = 2.66 M[H2]eq = 0.64 M[NH3]eq = 3.34 M
We can substitute these values into the expression for Kc and obtain the following:Kc = (3.34)² / (2.66)(0.64)³ = 0.0579 (rounded to four decimal places).
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The value of gravitational acceleration of a body on earth is 9.8 meters/second 2 power. The gravitational energy for a 1.00 kg object is found to be 12.5 joules. How high is the ground level, where KE = 0
Answer:
I don't know what the hell is going on with the this.
Construction of battery cells
Answer:
These batteries are constructed of several single cells connected in series each cell produces approximately 2.1 volts. ... A battery cell consists of two lead plates a positive plate covered with a paste of lead dioxide and a negative made of sponge lead, with an insulating material (separator) in between.
A gas expands from 2.5 L to 8.6 L at a constant temperature. If the initial pressure is 1.6 atm, what is the final pressure?
Explanation:
\(the final pressure is 0.47 x10^5\)
Suppose you did the lab and someone came and said your unknown acid sample was
actually HCl instead of H2SO4. Everything else remains the same; the standard acid was H2SO4,
the base was NaOH. What would change in your final calculation of the unknown acid
concentration
Answer:
H2SO4
Explanation:
because it's not more acidic
Both sulfuric acid and hydrochloric acid are potent acids, but hydrochloric acid is stronger. Because HCl is monoprotic and H2SO4 is diprotic, they differ mostly in their acid types.
Can HCl be substituted for H2SO4?Instead of using hydrochloric acid, sulphuric acid (H 2 SO 4) is preferred because: This acid is commonly utilized for a variety of neutralization reactions. Sulphuric acid is more potent than all other acids and is also simpler and safer to use. Even if there is a risk for negative reactions, they are uncommon.
The majority of the time because it is for a redox reaction or titration in which HCl would react to produce chlorine on its own. You could use phosphoric or sulfuric acid.
In this situation, H 2 SO 4 is preferable to HCl. Due to the considerable acidity of H 2 SO 4, the solution is made to be more acidic than HCl. As a result, the findings of titration using H 2 SO 4 are more precise. H 2 SO4 generates two hydronium ions, whereas HCl only generates one.
It shows how many protons split apart to create hydronium ions. The acid will be more potent the lower the pKa value. Therefore, we can conclude that HCl is more acidic than H2S O 4.
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Eric notices that his flashlight does not turn on when he flips the switch. What is the least appropriate hypothesis for Eric to make?
The flashlight does not want to work.
The batteries need to be replaced.
The light bulb is burned out.
The wiring has frayed.
Answer:
The flashlight does not want to work.
Explanation:
Im asumming its this one, hope this helps! even though im a little late :/
Maintenance of............of the body such as temperature level, water content, pH and blood pressure to be in balanced and stable condition
Share what you have learned about first aid to your family......
please help me with this.
Answer:
\( \huge\pink{ \mid{ \underline{ \overline{ \tt Answer :- }} \mid}}\)
=> First Aid enables you to assist persons who become injured in the event of an accident or emergency situation until help arrives.
\( \huge\blue{ \mid{ \underline{ \overline{ \tt Situations :- }} \mid}}\)
=> If an accident happens in the workplace, in your home or in a public space, you can use the help of a first aid kit.
=> In situations such as when someone ingests a harmful substance, suffers from a heart attack, a seizure or stroke, is involved in a motor vehicle accident or is caught in a natural disaster, a person trained and knowledgeable in even the very basics of First Aid can be of extreme importance in assisting the injured person(s) until emergency responders arrive.
Which of these elements are often made in a lab?
transuranium
noble gas
alkali metal
halogen
Answer:
I am sure it's Transuranium.
Explanation:
Hope it's right
How many significant figures are in 3.02 x 108 ?
a
2
b 4
C 5
d 3
Answer:
C
Explanation:
the answer has 5 Numbers
List four kinds of energy. Give a brief definition of each.
Answer:
Mechanical Energy- Energy that result from movement or the location of the object. Is the sum of kinetic and potential energy.
Thermal Energy- Thermal energy or heat energy reflects the temperature difference between two systems.
Nuclear Energy- is energy resulting from changes in the atomic nuclei or from nuclear reactions.
Chemical Energy- results from chemical reactions between atoms or molecules.
More:
Kinetic energy- is the energy of motion of a body. It ranges from 0 to a positive value.
Electromagnetic energy- (or radiant energy) is energy from light or electromagnetic waves.
Sonic energy- is the energy of sound waves. Sound waves travel through the air or another medium.
Gravitational energy- energy associated with gravity involves the attraction between two objects based on their mass.
Ionization energy- is the form of energy that binds electrons to the nucleus of its atom, ion, or molecule.
Potential energy- is the energy of an object's position.
Explanation:
Hope this helps
what does the picture depict about ecology?
738.90 m has ____ significant figures
Answer: 4
Explanation: because the zero doesn't count
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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The Sun has been shining on this swimming pool all day. The water is much warmer than it was in the morning. Describe what is happening to the water in terms of temperature, particle speed, and kinetic energy.
Answer:
The waters' temp increased
Explanation:
The temperature of the water in the swimming pool has increased due to the heat from the Sun. As a result, the particles in the water are moving faster and have a higher kinetic energy than in the morning.
4. Long answer type questions: a. b. C. d. e. f. g. h. j. i. What are the constituent gases of air? Why is the surrounding air not seen with the eyes? How do you prove that air supports burning? How do you show that air occupies space? How do you prove that air has weight? How is air useful to us? Mention any three points. Write any three properties of air. How can you say that air exerts force? Write any four effects of air pollution. Write any three causes of air pollution and any two control measures of it.
1. The constituent gases of air are:
Nitrogen Oxygen Argon Carbon Dioxide2. The surrounding air is not seen with the eyes because it is transparent. Air molecules are not visible to the na-ked eye, and they do not scatter or absorb visible light significantly. Therefore, air appears colorless and transparent.
What is air?3. To prove that air supports burning, you can perform an experiment with a burning candle. Place a glass jar or bell jar over a lit candle, ensuring that the jar is airtight. As the candle burns, it consumes oxygen from the air inside the jar. Eventually, the candle flame will go out due to the lack of oxygen, proving that air (specifically oxygen) is necessary for burning.
4. To show that air occupies space, you can perform a simple experiment using a plastic bottle or syringe. Fill the bottle or syringe with water, ensuring there are no air bubbles. Then, cover the opening tightly and try to compress the air inside. You will find that it is not possible to compress the air significantly, indicating that air occupies space.
5. To prove that air has weight, you can use a sensitive balance or scale. Weigh an airtight container or balloon, and then fill it with air. The weight of the container or balloon with the added air will be greater than its initial weight, demonstrating that air has weight.
6. Air is useful to us in various ways. Three points highlighting the importance of air are:
Breathing and RespirationCombustion and Energy ProductionClimate Regulation7. Three properties of air include:
Air is Compressible: Air can be compressed or expanded under different conditions, allowing it to fill various spaces and containers.Air has Mass: Air molecules have mass, which means air itself has weight. It exerts pressure on objects and surfaces.Air Exerts Pressure: Due to the collisions of air molecules with surfaces, air exerts pressure in all directions. This pressure is known as atmospheric pressure.Air exerts force in various ways. For example, air pressure allows objects like airplanes to fly by providing lift. Air resistance or drag opposes the motion of objects moving through the air, creating a force that can affect their speed and trajectory.
8. Four effects of air pollution include:
Respiratory ProblemsEnvironmental Damage:Climate ChangeHuman Health Impacts9. Causes of pollution:
Industrial EmissionsVehicle EmissionsResidential and Agricultural Activities10. Two control measures for air pollution include:
Emission ReductionAir Quality RegulationsLearn more about air on https://brainly.com/question/15215203
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how do you calculate metal density?
Answer:
You can divide the mass by the volume to calculate the density of the metal
Explanation:
Which of the following is an incorrect representation for a neutral atom?
36Li
613C
3063Cu
1530P
This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97. The incorrect representation for a neutral atom is 36Li
To determine the correct representation for a neutral atom, we need to consider the atomic number (Z) and mass number (A) of the element. The atomic number represents the number of protons in the nucleus, while the mass number represents the sum of protons and neutrons.
Let's analyze the given representations:
36Li:
This representation suggests that the element is lithium (Li) with a mass number of 36, which is incorrect. The correct mass number for lithium is approximately 6.94.
613C:
This representation suggests that the element is carbon (C) with a mass number of 13, which is correct. Carbon has different isotopes, and 13C represents one of its stable isotopes.
3063Cu:
This representation suggests that the element is copper (Cu) with a mass number of 63, which is correct. Copper has different isotopes, and 63Cu represents one of its stable isotopes.
1530P:
This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97.
Therefore, the incorrect representation for a neutral atom is 36Li, as it does not match the known properties of lithium.
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A 1.85-mole sample of H₂O2 weighs
(A) 33.3 amu
(B) 35.9 g
C) 62.9 g
(D) 1.85 g
E 33.3 g
Considering the definition of molar mass, the correct answer is option c): the mass of 1.85 moles H₂O₂ is 62.9 grams.
Definition of molar massThe molar mass of substance is a property defined as the amount of mass that a substance contains in one mole.
The molar mass of a compound is the sum of the molar mass of the elements that form it (whose value is found in the periodic table) multiplied by the number of times they appear in the compound.
Molar mass of H₂O₂In this case, you know the molar mass of the elements is:
O= 16 g/moleH= 1 g/moleSo, the molar mass of the compound H₂O₂ is calculated as:
H₂O₂= 2× 1 g/mole + 2× 16 g/mole
Solving:
H₂O₂= 34 g/mole
Mass of 1.85 moles H₂O₂You can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 34 grams, 1.85 moles of the compound contains how much mass?
mass= (1.85 moles× 34 grams)÷ 1 mole
mass= 62.9 grams
Finally, the mass of 1.85 moles H₂O₂ is 62.9 grams.
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What type of energy is created by water?
A. Water is used to convert wind into electrical energy.
B. Water creates electricity through rushing water, called hydroelectricity.
C. Solar panels are used to convert wind into electrical energy.
D. Water produces a stronger and faster type of mechanical energy.
Answer:
the answer is B
Explanation:
hope this works
How would you distinguish between ethanol and diethyl ether?
Answer:
Alcohol is an Organic Compounds with a hydroxyl group (–OH) bonded to a carbon atom, whereas ether is an Organic Compounds with an oxygen atom that is bonded to two carbon atoms. The major difference between alcohol and ether is the absence of OH groups in the ether that are present in alcohol.
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How many years are there in 1.10 s?
Express your answer using three significant figures.?
Answer:
Below
Explanation:
Number of seconds in one year
3600 s/hr * 24hr/day * 365.25 day/yr = 31 557 600 s/yr
1.10 s / 31 557 600 s/yr = 3.49 x 10^-8 yr
Which EMW can humans see?
Answer:
visible light waves are the only electromagnetic waves we can see
If you measure pressure in bars instead of atmospheres, calculate the corresponding value of R in L −bar/ mol −K .
The value of the constant R in L*atm/(mol*K) is approximately 0.082057 L*atm/(mol*K). The units are a little complex so it is easier for us to viasualize it as a fraction:
\(R\approx0.082057\times\frac{L\cdot atm}{mol\cdot K}\)To get the constant value in terms of bar, that is, L*bar/(mol*K), we can use the convertion of atm-bar:
\(1atm=1.01325bar\Rightarrow1=\frac{1.01325bar}{1atm}\)So, we have:
\(R\approx0.082057\times\frac{L\cdot atm}{mol\operatorname{\cdot}K}=0.082057\times\frac{L\operatorname{\cdot}atm}{mol\operatorname{\cdot}K}\times\frac{1.01325bar}{1atm}\approx0.083144\times\frac{L\operatorname{\cdot}bar}{mol\operatorname{\cdot}K}\)So, the value of the constant R is approximately 0.083144 L*bar / (mol*K).
Which is a reason to use rate laws?
A. to investigate how the pressure of liquids affects reaction rates
B. to find the new rate when the concentration of reactants changes
C. to calculate the molecular weight of compounds in a reaction
D. to find the number of moles of solute that are dissolved in 1 L of solution
Answer:
B
Explanation:
to find the new rate when the concentration of reactants changes
Calculate the standard enthalpy change for the reaction
2A+B⇌2C+2D
Use the following data:
Substance ΔH∘f
( kJ/mol)
A -231
B -409
C 177
D -515
Express your answer to three significant figures and include the appropriate units.
The standard enthalpy change for the reaction 2A + B ⇌ 2C + 2D is 195 kJ/mol.
What is the enthalpy of a reaction?The enthalpy of a reaction is a measure of the heat changes that occur when reactants form a product in a given reaction.
The enthalpy change of a reaction can be calculated using the formula given below:
Enthalpy of reaction = sum of enthalpies of the products - sum of enthalpies of the reactants
Considering the given reaction: 2A + B ⇌ 2C + 2D
Enthalpy of reaction = (2 * C + 2 * D) - (2 * A + B)
Enthalpy of reaction = {[2 * 177 + 2 * (-515)] - [2 * (-231) + (-409)]}
Enthalpy of reaction = 195 kJ/mol
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Which compound has a functional group that contains two oxygen atoms?
The compound that has a functional group containing two oxygen atoms is peroxide. In addition to peroxides, there are other compounds that contain functional groups with two oxygen atoms. These include carboxylic acids and esters.
Peroxide compounds, such as hydrogen peroxide (H₂O₂) or organic peroxides, have a functional group (-O-O-) where two oxygen atoms are bonded together. This group is responsible for the characteristic properties and reactivity of peroxides.
Carboxylic acids: Carboxylic acids have the functional group -COOH, which consists of a carbonyl group (C=O) and a hydroxyl group (-OH) bonded to the same carbon atom. While carboxylic acids have one oxygen atom from the carbonyl group, the hydroxyl group provides the second oxygen atom.
Esters: Esters have the functional group -COO-, which consists of a carbonyl group (C=O) and an oxygen atom (-O-) bonded to the same carbon atom. This arrangement gives esters two oxygen atoms within their functional group.
Hence, the compounds with functional groups containing two oxygen atoms include peroxides, carboxylic acids, and esters.
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