Answer:
the strength of gravitational force between two objects depends on two factors,mass and distance. the force of gravity the masses exert on each other. if one of the masses is doubled, the Force of gravity between the object is doubled. increases the force of gravity decreases.
5 Select all the correct answers. A worker is holding a filled gas cylinder still. Which two sentences are true about the energy of the filled gas cylinder? A man in a blue dress holding a red color cylinder It has no energy because it’s being held still. It has gravitational potential energy because of its height. Its atoms and molecules have thermal energy. It has motion energy because it will fall if let go. Its kinetic energy is being converted to potential energy. Reset Next
Answer:The two correct sentences about the energy of the filled gas cylinder are:
It has gravitational potential energy because of its height.
Its atoms and molecules have thermal energy.
Explanation:
The gas cylinder being held still does not imply that it has no energy. Energy can exist in different forms.
The gravitational potential energy is present because the gas cylinder is at a certain height from the ground, and it possesses the potential to fall and convert that potential energy into kinetic energy.
The atoms and molecules of the gas inside the cylinder possess thermal energy, which is related to their random motion and temperature.
The statement about motion energy and conversion to potential energy is not applicable to the gas cylinder being held still.
Diastolic blood pressure is a measure of the pressure when arteries rest between heartbeats. Suppose diastolic blood pressure levels in women are normally distributed with a mean of 70.2 mmHg and a standard deviation of 10.8 mmHg. Complete parts (a) and (b) below. a. A diastolic blood pressure level above 90 mmHg is considered to be hypertension. What percentage of women have hypertension? % (Round to twa decimal places as needed.)
The percentage of women with hypertension, defined as a diastolic blood pressure level above 90 mmHg, can be calculated using the standard normal distribution table.
To find the percentage, we need to calculate the z-score for a diastolic blood pressure of 90 mmHg using the formula:
z = (x - μ) / σ
where x is the diastolic blood pressure value, μ is the mean, and σ is the standard deviation.
In this case, x = 90 mmHg, μ = 70.2 mmHg, and σ = 10.8 mmHg.
Substituting these values into the formula, we get:
z = (90 - 70.2) / 10.8 = 1.833
Next, we need to find the corresponding area under the standard normal curve for a z-score of 1.833. By referring to the standard normal distribution table or using a calculator, we find that the area to the left of 1.833 is approximately 0.9664.
To determine the percentage of women with hypertension, we subtract this area from 1 and multiply by 100:
Percentage = (1 - 0.9664) × 100 ≈ 3.36%
Therefore, approximately 3.36% of women have hypertension based on the given diastolic blood pressure criteria.
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At what elevation would there be the highest atmospheric pressure?
Answer:
The highest sea-level pressure on Earth occurs in Siberia
Explanation:
where the Siberian High often attains a sea-level pressure above 1050 mbar (105 kPa; 31 inHg), with record highs close to 1085 mbar (108.5 kPa; 32.0 inHg).
A small coil of magnesium ribbon is placed in a crucible. The crucible and cover have a mass of 21.35 grams. Measuring the mass, including the magnesium gives 21.63 grams. The crucible, cove and contents are heated and then cooled and treated with water, A second heating and measuring of the final product (magnesium combined with oxygen) gives a mass of 21.82 grams. Determine the empirical formula of this oxide of magnesium.
The empirical formula of this oxide of magnesium is derived as MgO.
What is empirical formula?In chemistry, empirical formula of a chemical compound is simplest whole number ratio of atoms present in compound. An example of this concept is that: empirical formula of sulfur monoxide, or SO, would be SO as the empirical formula of disulfuric dioxide, S₂O₂.
Given total mass of magnesium ribbon, crucible and cover of 21.35 grams
Given that magnesium combined with oxygen gives a mass of 21.82 grams.
As we know, mass of magnesium oxide = mass of Mg + mass of O
mass of O = 21.82 - 21.35
= 0.19
moles of O = 0.19/16
= 0.011 mol O
So, now the empirical formula of magnesium oxide is MgO.
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Suggest the pH of the solution made when potassium oxide dissolves in water.
It gets basic
ie ph>7 for basic solutions
A buffer is prepared containing 1.00 molar acetic acid and 0.800 molar sodium acetate. What is its pH?
When a buffer is prepared containing 1.00 molar acetic acid and 0.800 molar sodium acetate, the pH of the buffer solution is 4.67.
A buffer solution is a solution that resists changes in pH when small amounts of acid or base are added to it. In this case, the buffer contains 1.00 M acetic acid (HC2H3O2) and 0.800 M sodium acetate (NaC2H3O2).
To determine the pH of the buffer, we need to use the Henderson-Hasselbalch equation, which relates the pH of a buffer to the ratio of the concentrations of the conjugate base and acid. The equation is as follows:
pH = pKa + log([A-]/[HA])
where pKa is the dissociation constant of the acid, [A-] is the concentration of the conjugate base, and [HA] is the concentration of the acid.
The pKa of acetic acid is 4.76. Therefore, we can plug in the values for [A-] and [HA]:
pH = 4.76 + log([NaC2H3O2]/[HC2H3O2])
pH = 4.76 + log(0.800/1.00)
pH = 4.76 + (-0.096)
pH = 4.67
Therefore,4.67 is the pH of the buffer solution. This means that the solution is slightly acidic, but the buffer will resist changes in pH if small amounts of acid or base are added to it.
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Which process changes water into a gaseous state?
a
deposition
b
sublimation
c
precipitation
d
condensation
Answer:
The Answer is condensation
I need help with these
What is Decomposition Reaction
Answer:
Explanation:
Decomposition reaction, also known as analysis or dissociation, is a type of chemical reaction in which a compound breaks down into simpler substances or elements. In this reaction, a single reactant undergoes a chemical change and produces two or more products.
The decomposition reaction can be represented by the general equation:
AB → A + B
Where AB is the reactant, and A and B are the products. The reactant AB is usually a compound, and it breaks down into its constituent elements or simpler compounds.
There are different types of decomposition reactions, including:
Thermal decomposition: It occurs when a compound is heated, resulting in its decomposition into simpler substances. For example, the thermal decomposition of calcium carbonate (CaCO3) produces calcium oxide (CaO) and carbon dioxide (CO2):
CaCO3 → CaO + CO2
Electrolytic decomposition: It takes place when an electric current is passed through an electrolyte, causing it to break down into its component ions. For instance, the electrolysis of water (H2O) leads to the decomposition into hydrogen gas (H2) and oxygen gas (O2):
2H2O → 2H2 + O2
Photochemical decomposition: It occurs when a compound undergoes decomposition due to exposure to light energy. Chlorine gas (Cl2) can decompose into chlorine atoms (Cl) under the influence of light:
Cl2 → 2Cl
These are just a few examples of decomposition reactions. They are important in various chemical processes and are used in industries, laboratory experiments, and natural phenomena. By understanding and controlling decomposition reactions, scientists can gain insights into the behavior of different compounds and develop practical applications in fields such as chemistry, materials science, and environmental science.
Answer:
Explanation:
reaction in which a compound breaks down into simpler substances or elements
If equilibrium concentrations are [a]=0.62 m, and [c]=0.94 m, and kc=6.7, what is the equilibrium concentration of b?
To find the equilibrium concentration of b, we need to use the equilibrium constant (Kc) expression and the given concentrations of a and c.
The equilibrium constant expression for the reaction can be written as:
Kc = [c]^c * [b]^b / [a]^a
Given that [a] = 0.62 M, [c] = 0.94 M, and Kc = 6.7, we can substitute these values into the expression:
6.7 = (0.94)^c * [b]^b / (0.62)^a
Now, we need to determine the stoichiometric coefficients for each species in the balanced chemical equation to find the value of b. Unfortunately, the question doesn't provide the balanced equation or any information about the stoichiometry of the reaction.
Without this information, we cannot determine the equilibrium concentration of b solely based on the given data. We would need additional information about the balanced equation and the stoichiometry of the reaction.
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name some examples of chemical solutions and maybe give a clear explanation as to what chemical solutions are
Answer:
Some examples of solutions are salt water, rubbing alcohol, and sugar dissolved in water. ... In our example of salt water, the solute is the salt. Solvent: this is the substance that makes up the majority of the solution. This is the part where the solute is dissolved.
Explanation:
I hope they should be right answer
What causes the periodic change between night and day?.
Answer:
the earth and moon rotate around the sun, therefore on sides facing the sun while the other is facing the moon
nitrogen and oxygen can react to form nitrite oxide gas. N2(g)+O2(g) arrow 2NO(g) delta h reaction = 180.6kj. if 2976 kj of heat is absorbed by the reaction how many moles of NO can be produced
The balanced equation for the reaction is N2(g) + O2(g) → 2NO(g).
The given value for the enthalpy change of the reaction is ΔH = 180.6 kJ. This value represents the heat released per mole of N2 reacted.
To determine the number of moles of NO produced, we need to calculate the moles of N2 reacted. Since the reaction is exothermic, the heat absorbed by the reaction is negative (-2976 kJ). However, it is not physically possible to have a negative number of moles. Therefore, we can conclude that no NO is produced in this case because the heat absorbed is insufficient to drive the reaction.
Using the equation ΔH = -2976 kJ/mol N2, we can set up a proportion:
180.6 kJ/1 mol N2 = -2976 kJ/x mol N2
Solving for x, we find:
x = (-2976 kJ * 1 mol N2) / (180.6 kJ) ≈ -16.46 mol N2
Since the reaction produces 2 moles of NO for every mole of N2, the number of moles of NO produced is twice the number of moles of N2:
Moles of NO = 2 * (-16.46 mol) ≈ -32.92 mol
The given reaction is N2(g) + O2(g) → 2NO(g), and the enthalpy change of the reaction is ΔH = 180.6 kJ. If the reaction absorbs 2976 kJ of heat, the number of moles of NO that can be produced can be calculated. By setting up a proportion, we find that approximately -16.46 moles of N2 are reacted. Since the reaction produces 2 moles of NO for every mole of N2, the calculated moles of NO would be approximately -32.92. However, negative moles are not physically possible, indicating that no NO can be produced in this case due to insufficient heat absorbed by the reaction.
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Evaluate which factor is most likely to cause the concentration of greenhouse gases in the earth's atmosphere to increase?
A.
decreased number of decomposing plants
B.
decreased number of volcanic eruptions
C.
increased frequency of earthquakes
D.
increased human industrial activities
Answer:
D. increased human industrial activities
What ma of potaium chlorate i needed to generate 114. 0 L of O2 at 0. 720 atm and 291 K?
The mass of potassium chlorate is 0.3439 to generate 114.0 L \(O_{2}\) at 0.720 atm and 291K
The decomposition of potassium chlorate is represented as
\(2KClO_{3} (s) - > 2KCl(s) + 3O_{2} (g)\)
Given, Volume = 114.0 L
pressure = 0.720 atm
temperature = 291 K
According to the Ideal gas Equation
Pv = nRT
\(n=\frac{Pv}{RT}\)
\(n=\frac{0.720*114.0}{0.82*291}\)
n= 0.3439
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Newton's 2nd Law of Motion states that the "acceleration" of an object depends on what 2 things? i need help fast plz 10 points
Answer:
Speed and velocity
Explanation:
PLS HELP
In the balanced equation:
H3PO4(aq) + NH3(aq) ↔ X(aq) + NH4+(aq)
The particle represented by X(aq) is
A) H2PO4–(aq)
B) HPO42–(aq)
C) PO43–(aq)
D) H3PO4(aq)
Answer:
The particle represented by X(aq) is A) H₂PO₄⁻(aq)
Explanation:
According to the Brønsted-Lowry Theory, a base is a substance capable of accepting protons (H⁺) in solution. Conversely, a substance acts as an acid if it acts as a proton donor.
A proton transfer then occurs, requiring the presence of a proton donor (an acid) and a base that accepts them.
When an acid gives up a proton, it becomes an anion, generating a conjugate base. That is, a conjugate base is an ion or molecule resulting from the acid that loses the proton. Conversely, a conjugated acid is an ion or molecule resulting from the base that the proton gains.
In this NH₃ / NH₄⁺ pair that NH₄⁺ is the conjugate acid of the NH₃ base, the latter acting as a base since it accepts a proton. H₃PO₄ then acts as an acid, yielding a proton and generating the conjugate base H₂PO₄⁻.
So, the particle represented by X(aq) is A) H₂PO₄⁻(aq)
prokaryotic organisms are all ______ , or single- celled, organisms
Answer:
multi-celled
Explanation:
prokaryotic organisms are all, multi-celled, or single- celled, organisms
Xylocaine, a local anaesthetic which has largely replaced novocaine in dentistry, is a compound of carbon, hydrogen, nitrogen and oxygen. Combustion of a 0.4817 g sample of xylocaine yielded 1.2665 g of CO2 and 0.4073 g of H2O. A separate nitrogen assay, using another 0.4817 g sample of xylocaine formed 0.07006 g NH3. What is the empirical formula of xylocaine?
The empirical formula of xylocaine is C₁₄H₂₂N₂O. Definition of Empirical formula An empirical formula may be defined as the chemical formula that represents the simplest whole number ratio of atoms present in a molecule. It doesn't show the actual number of atoms present in a molecule.
The empirical formula of a compound can be determined by analyzing the percentage composition of the elements involved in it. It is given that, A 0.4817 g sample of xylocaine on combustion yielded 1.2665 g of CO2 and 0.4073 g of H2O and a nitrogen assay using another 0.4817 g sample of xylocaine formed 0.07006 g NH3.The percentage composition of carbon in xylocaine is: Mass of carbon = Mass of CO2 produced in combustion= 1.2665 g - (2 × Atomic mass of O) = 1.2665 g - (2 × 16.00 g) = 1.2665 g - 32.00 g= 1.2345 g% of carbon in xylocaine = (mass of carbon / total mass) × 100 = (1.2345 g / 0.4817 g) × 100 = 255.93%The percentage composition of hydrogen in xylocaine is:Mass of hydrogen = Mass of H2O produced in combustion= 0.4073 g - (1 × Atomic mass of O) = 0.4073 g - 16.00 g= 0.3913 g% of hydrogen in xylocaine = (mass of hydrogen / total mass) × 100 = (0.3913 g / 0.4817 g) × 100 = 81.18%The percentage composition of nitrogen in xylocaine is: Mass of nitrogen = Mass of NH3 formed in nitrogen assay= 0.07006 g / 3 = 0.02335 g% of nitrogen in xylocaine = (mass of nitrogen / total mass) × 100 = (0.02335 g / 0.4817 g) × 100 = 4.85%The percentage composition of oxygen in xylocaine is: Total percentage of C, H and N in xylocaine= 255.93% + 81.18% + 4.85% = 342.96%Percentage of oxygen in xylocaine = (100 - 342.96)% = -242.96%
Therefore, there is a mistake in the question as the sum of all percentages must be 100. Therefore, we need to adjust the percentage of carbon, hydrogen, nitrogen and oxygen in the given xylocaine. The percentage of carbon in xylocaine = 255.93 / 4.85 = 52.74%The percentage of hydrogen in xylocaine = 81.18 / 4.85 = 16.71%The percentage of nitrogen in xylocaine = 4.85 / 4.85 = 1%The percentage of oxygen in xylocaine = (100 - 52.74 - 16.71 - 1) % = 29.55%Now, we have the percentage composition of each element in xylocaine. We can find the empirical formula of xylocaine by converting the percentage composition to the mole ratio. The empirical formula of xylocaine is given by:CxHyNzOw%Composition52.74 %16.71 %1 %29.55 %Molar mass per cent100 / Molar mass12.01 / 1001.008 / 10014.01 / 10016 / 100Moles per 100 g xylocaine4.38 mole35.16 mole0.071 mol1.846 mole Divide by the smallest value0.071/0.071 = 1 mole1.008/0.071 = 14.18 mole14.01/0.071 = 197.18 mole16/0.071 = 225.34 mole Empirical formula C₁₄H₂₂N₂O
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What is the tertiary consumer in this food chain?
A hawk
B lettuce
C snail
D thrush
Answer:
the hawk
Explanation:
in order it would be: producer, primary, secondary, tertiary
Answer:
the hawk is the tertiary consumer
I'm just looking for someone to check my answers on this and correct me if I'm wrong :)This is the question:You have three elements, A, B, and C, with the following electronegativity values:A = 0.9B = 3.0C = 3.5You react the elements to form the substances AB, AC, and BC. Answer the following questions:What type of substance is AB? What types of bonds are present? Explain your answer.What type of substance is AC? What types of bonds are present? Explain your answer.What type of substance is BC? What types of bonds are present? Explain your answer.If any of the substances are ionic compounds, which element is the cation and which is the anion? Explain your answer.And these are my answers:AB is a compound. It'd be an ionic compound because the electronegativity is different in each.AC is a compound. It'd be an ionic compound because the electronegativity is different in each.BC is a compound, but the bond between them is covalent.AB is an ionic compound. A is the cation and B is the anion because the element with lower electronegativity is the cation and the element with the higher electronegativity is the anion.
Answer:
Explanations:
Given the following electronegativity of three elements as:
How do properties of waves affect light and sound
Answer:
Explanation:
Both light and sound can be described in terms of wave forms with physical characteristics like amplitude, wavelength, and timbre. Wavelength and frequency are inversely related so that longer waves have lower frequencies, and shorter waves have higher frequencies.
pentacarbonyliron (fe(co)5) reacts with phosphorous trifluoride (pf3) and hydrogen, releasing carbon monoxide: fe(co)5 2pf3 h2 → fe(co)2(pf3)2(h)2 3co the reaction of 5.0 mol of fe(co)5, 8.0 mol of pf3 and 6.0 mol of h2 will release mol of co.
Fe(CO)₅ is the limiting reactant given the provided statement since it has the lowest ratio.
What defines a limiting reactant?The quantity of product that can be created is constrained by the reagent that is used first in a chemical reaction, also referred to as the limiting reactant (or limiting reagent).
Briefing:Calculating the moles supplied/moles stoich ratio will reveal the limiting reactant, which is the one with the lowest value.
Fe(CO)₅ ratio = [5 g / 195.9 g/mol] / 1
Fe(CO)⁵ ratio = 0.025
PF3 ratio = [8 g / 87.97 g/mol] / 2
PF3 ratio = 0.045
H2 ratio = [6 g / 2 g/mol] / 1
H2 ratio = 3
We can see that Fe(CO)5 has the lowest ratio, so it is the limiting reactant.
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Consider the following system at equilibrium where Kc = 154 and ΔH∘ = -16.1 kJ/mol at 298 K.
2NO(g)+Br2(g)⇋2NOBr(g)2
True or false? The production of NOBr(g) is favored by increasing the volume.
False. The production of NOBr(g) is not favored by increasing the volume. In the given equilibrium reaction, 2NO(g) + Br2(g) ⇋ 2NOBr(g), there are a total of 3 moles of gas on the reactant side and 2 moles of gas on the product side.
According to Le Chatelier's principle, when the volume is increased, the equilibrium will shift in the direction that has more moles of gas to counteract the change.
In this case, when the volume is increased, the equilibrium will shift towards the reactant side, which has more moles of gas (3 moles) compared to the product side (2 moles). This means that the production of NOBr(g) is not favored when the volume is increased. Instead, the concentration of NO(g) and Br2(g) will increase, while the concentration of NOBr(g) will decrease.
Additionally, since the reaction has a negative ΔH° value, it is exothermic, meaning heat is released. An increase in temperature would shift the equilibrium towards the reactants, further supporting the conclusion that increasing the volume does not favor the production of NOBr(g).
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One mole of Beryllium weighs 9.0122 grams. How many atoms of Beryllium are
there?
4
9.0122
6.022 x 10^23
18
Answer:
4
Explanation:
cause 1 mole of beryllium weighs 4gram
explain why vehicles of mombasa rust faster than vehicles at nairobi
Answer:
The primary reason why cars in Mombasa rust faster than those in Nairobi is because the humidity ( water evaporation rate) in Mombasa is higher than that of Nairobi. Since Mombasa has higher temperatures the rate of water evaporation is higher which results into a higer humidity.
Explanation:
This is why cars in Mombasa rust faster than those in Nairobi
PLS, DON'T GUESS.
The speed at which sound waves travel in a medium depends upon the density and __________________________________ of the medium.
magnitude
formation
compressibility
The speed at which sound waves travel in a medium depends upon the density and compressibility of the medium. Density refers to how closely packed the particles of a substance are, while compressibility refers to how easily the substance can be compressed or squeezed.
In general, the denser and less compressible a substance is, the faster sound waves will travel through it. This is why sound travels faster through solids than through liquids or gases, as solids are generally denser and less compressible than liquids or gases. Additionally, the temperature of the medium can also affect the speed of sound waves, as warmer substances tend to have faster-moving particles that can transmit sound more quickly.
The speed at which sound waves travel in a medium depends upon the density and compressibility of the medium.
To reiterate, the two factors affecting the speed of sound waves are:
1. Density of the medium
2. Compressibility of the medium
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how do the melting points of enantiomers compare to each other? how do the melting points of diastereomers compare to each other?
Melting points of enantiomers will not compare to each other as they have same M.P. and Diastereoisomers are compared on the basis of melting point.
What are steroisomers?Stereoisomers are those isomers which are having the same molecular formula but different spatial arrangemet of atoms within the molecule.
Enantiomers: Enantiomers are pair of two stereoisomers which are having mirror image of each other, but are not superiposable. They have the same melting point so we can not compare enantiomers on the basis of their melting point.Diastereoisomers: Diastereoisomers are pair of those stereoisomers which are not having mirror image of each other, but are superimposable.They have different physical and chemical properties, so it can be compared on the basis of melting point.Hence, only diastereoisomers are compared on the basis of melting point.
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noninvasive can used to study the responses of single neuron?
No, noninvasive can not be used to study the responses of single neuron.
It is not possible to study the responses of a single neuron non-invasively using current technology. The information related to the activity of a single neuron can be studied using invasive methods such as microelectrode recordings from a single neuron. It is crucial to be cautious while performing such methods as it might damage the brain tissue.
Some non-invasive techniques like fMRI, EEG, and MEG can only record neural activity from many neurons together. EEG, fMRI, and MEG provide information on the activity of groups of neurons, but they cannot provide information on single neuron activity. Hence, invasive techniques are preferred as they can provide detailed information about the activity of individual neurons.
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2W + X -> Y+ Z
has the mechanism shown below. What is the rate law for this reaction?
According to chemical equilibrium,the rate law of the given chemical reaction is rate=K[W]³.
What is chemical equilibrium?Chemical equilibrium is defined as the condition which arises during the course of a reversible chemical reaction with no net change in amount of reactants and products.A reversible chemical reaction is the one wherein the products as soon as they are formed react together to produce back the reactants.
At equilibrium, the two opposing reactions which take place take place at equal rates and there is no net change in amount of the substances which are involved in the chemical reaction.At equilibrium, the reaction is considered to be complete . Conditions which are required for equilibrium are given by quantitative formulation.
Factors which affect chemical equilibrium are change in concentration , change in pressure and temperature and presence of catalyst.As second step s slow step the rate law comes from this step where K=[product]\(^moles\)=[W]³ and concentration of X does not matter as it is present in excess.
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