Answer:
P.E = 25.48 J
Explanation:
Given data:
Mass = 2 Kg
Height = 1.3 m
Potential energy = ?
Solution:
Formula:
P.E = m . g . h
P. E = potential energy
m = mass in kilogram
g = acceleration due to gravity
h = height
Now we will put the values in formula.
P.E = m . g . h
P.E = 2 Kg . 9.8 m /s² . 1.3 m
P.E = 25.48 Kg. m² / s²
Kg. m² / s² = J
P.E = 25.48 J
Answer:
PE= 25.48 J
Explanation:
m= 2 kg
h= 1.3 m
PE= ?
m= 2 kg
h= 1.3 m
PE= ?
What do scientists do? O A. They use their knowledge to make public policy O B. They make sure all facts fit scientific theories. O C. They make ethical decisions for the government O D. They learn about the world through observation.
Considering there are different fields of science and many career involving the matter, I'd say that option D. They learn about the world through observation. makes the most sense in this scenario.
I hope this helps! :)
I think the answer to this is D, I am sorry if I’m wrong
what is a subshell? explain why is it important.
a subshell is a subdivision of electron shells seperated by electron orbitals
The Ethical, Legislative, Social Initiative is the agency responsible for _____.
convicting and closing poorly run forensic laboratories
the first DNA-analysis-based convictions
upholding the guidelines for managing a DNA laboratory
consideration of ethical, legal, and social implications related to the human genome
They are responsible for DNA
Answer:
considering ethical, legal, and social implications related to the human genome
Explanation:
What trend is seen in atom size, going down the periodic table?
A. Atomic radius gets bigger the lower an atom appeares on the periodic table
B. Atomic radius stays the same in a column of the period table
C. Atomic radius varies the lower an atom appears on periodic table.
D. Atomic radius gets smaller the lower an atom appears on the periodic table.
A, it gets bigger, you can tell by its atomic mass and electron configuration
Answer:
A
Explanation:
How many moles of solute do you need to make one liter of a 1.25 mol/L ammonium hydroxide solution
Answer:
1.25mol of solute
Explanation:
Given parameters:
Volume of solvent = 1liter
Molarity of solution = 1.25mol/L
Solution:
To solve this problem, we use the concept of mole.
Number of moles of solute= molarity x volume of solvent
Number of moles = 1.25 x 1 = 1.25mol
What is the theoretical yield of NaCl would result from reacting 5.00 mil of Na2CO3 with excess HCl?
Answer:
584.4 g.
Explanation:
Na₂CO₃ reacts with HCl according to the balanced reaction:Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂.
It is clear that 1.0 mole of Na₂CO₃ reacts with HCl to produce 2.0 moles of NaCl.
Using cross multiplication:
1.0 mole of Na₂CO₃ → 2.0 moles of NaCl.
5.0 moles of Na₂CO₃ → ??? moles of NaCl.
The no. of moles of NaCl produced from 2.0 moles of Na₂CO₃ = (2.0 mol)(5.0 mol)/(1.0 mol) = 10.0 mol.
∴ The theoretical yield of NaCl = no. of moles of NaCl x molar mass of NaCl = (10.0 mol)(58.44 g/mol) = 584.4 g.
Which substances dissolve in water
Because water molecules are polar, water can dissolve many other polar substances. Water can also dissolve ionic compounds such as table salt.
Soluble substances anything power like that can be broken down by water like kool aid powder sugar salt. Please give me brainliest answer.
:) Hope this helped have a good day!
Consider the following equilibrium reaction having gaseous reactants and products.
4HCl + O2 ⇌ 2H2O + Cl2
Which of the following would result from increasing the volume of oxygen?
A.The volume of hydrochloric acid increases.
B.The rate of forward reaction increases.
C.The rate of backward reaction increases.
D.The volume of water vapor decreases.
B.The rate of forward reaction increases.
Explanation;Le Chatelier's principle states that changing a factor such as concentration, temperature, or pressure of a reaction at equilibrium will cause the reaction to shift in the direction that counteracts the effect of that change. Therefore, when reactants are added to a reaction at equilibrium shift when more reactants are added then the reaction shifts to the right to make more products.Answer:
B
Explanation:
I took the test
All atoms of the same element have the same atomic_____, which can be found on the periodic table ?
same atomic number..
Number is the answer.
Hope this helps.
Identify which property changes as temperature increases to increase the reaction rate.
A) Increasing the temperature decreases the molecular motion.
B) Increasing the temperature reduces the collision frequency.
C) Increasing the temperature divides the solubility of the solute.
D) Increasing the temperature increases the energy of the molecules.
Answer:D
Explanation:according to Kinetic molecular theory the kinetic energy is directly proportional to the absolute temperature.
It means that when we increase the temprature the motion of molecules increase,as a result the rate of reaction is also increased.
Which means that the effective collision is also increased.
Answer:
D) Increasing the temperature increases the energy of the molecules.
Explanation:
Increasing the temperature increases the energy of the molecules.
As temperature increases the energy of the molecules increases and the energy of the collision making it more likely for a reaction to occur.
The specific heat of aluminum is 0.897j/(g•°C). If a 22.6 g sample of aluminum is heated from 25°C to 250°C, then how much heat will the aluminum absorb?
Q=mcat
=(22.6)(.897)(250-25)
4,561.245 or 4.5 * 10^-3
To find the heat absorbed by the aluminum, use the formula Q = mc riangle T. The aluminum will absorb 4554.525 joules of heat when its temperature is increased from 25°C to 250°C.
The question involves calculating the amount of heat absorbed by a sample of aluminum when it is heated from one temperature to another, using the specific heat capacity of aluminum. The formula for heat absorbed or released is Q = mc riangle T, where Q is the heat absorbed, m is the mass of the substance, c is the specific heat capacity, and riangle T is the change in temperature.
To solve for Q in the given case:
Mass (m) of the aluminum sample = 22.6 g
Specific heat capacity (c) of aluminum = 0.897 J/g°C
Temperature increase ( riangle T) = 250°C - 25°C = 225°C
Now plug in the values: Q = 22.6 g * 0.897 J/g°C * 225°C = 4554.525 J
The aluminum will absorb 4554.525 joules of heat.
Which process is shown in the diagram below ?
Metamorphosis
Regulation
Fertilization
Respiration
The process that is being shown in the diagram below is Fertilization
The process that is being shown in the diagram below is Fertilization
Please do this entire worksheet for me. I will award 59 points!!
where is the work sheet?
Plz post the worksheet so that I can do it for you. Please don't report this, i am trying to help!
You have the same two resistors on a 10 volt series circuit. Will the voltage going into the second resistor be more, less, or the same as that going into the first resistor? Exact numbers aren’t needed!
NEED ANSWER ASAP PLEASE!
both resistance will have same voltage across it which is equal to 5 volt.
if resistance value is different then voltage drop across them will be different.
current in both resistance would be same.
let's say resistance is 5 ohm of each one.
total current = total voltage / total resistance
= 10 /(5+5) = 10/10 = 1 amp
now voltage across 5 Ohm resistance = current × resistance = 1× 5 = 5 volt
If the same two resistors on a 10 volt series circuit, the voltage going into the second resistor will be the same as that going into the first because they are connected into series.
What is a resistor?A resistor is a two terminal electrical component, that control the flow of charge in a circuit.
When the resistor is connected in series, the total voltage across all the resistors will be the same.
Thus, the voltage going into the second resistor will be the same as that going into the first.
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How do decomposers get energy?
A. by making their own food
B. by eating other organisms
C. by converting light energy into chemical energy
D. by breaking down the waste materials of dead organisms
I think the aswer is D
chemical equilibrium between gaseous reactants and products is shown.
N2(g) + 3H2(g) ⇌ 2NH3(g)
How will the reaction be affected if the pressure on the system is decreased?
Answer:
The reaction is shifted to the left.
Explanation:
Le Châtelier's principle states that when there is an dynamic equilibrium, and this equilibrium is disturbed by an external factor, the equilibrium will be shifted in the direction that can cancel the effect of the external factor to reattain the equilibrium.When there is a decrease in pressure, the equilibrium will shift towards the side with more no. of moles of gas molecules of the reaction.The reactants side (left) has 4.0 moles of gases and the products side (right) has 2.0 moles of gases.So, decreasing the pressure will shift the reaction to the side with more moles of gas (left side).so, the reaction is shifted to the left.
Decreasing the pressure on a system at chemical equilibrium will cause the reaction to shift towards the side with fewer moles of gas.
Explanation:When the pressure on a system at chemical equilibrium is decreased, the system responds by shifting in the direction that reduces the number of moles of gas. In this case, decreasing the pressure will cause the reaction to shift towards the side with fewer moles of gas, which is the reactant side. The reaction will produce more N2 and H2 and less NH3.
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When scientists say that a theory can never be proven, what are they actually saying?
They are saying that every theory can eventually be changed a bit due to further research. It does not mean the theory is bad, just that it can become better.
When scientists say that a theory can never be proven, they are emphasizing the principle that scientific theories are always open to revision or challenge by new evidence. This reflects the provisional nature of scientific knowledge and the understanding that theories can be robust and reliable without being definitively proven. It underscores science as an ongoing, dynamic process of exploration and discovery.
When scientists say that a theory can never be proven, they are highlighting a fundamental principle of scientific inquiry. The nature of scientific theories is such that they can never be definitively proven because there is always the possibility for new evidence or observations to emerge that could challenge the existing understanding. Scientific theories are considered robust and reliable not because they are proven, but because they have withstood rigorous testing and have not been disproven. This principle is grounded in the philosophy of science, notably the ideas presented by British philosopher Karl Popper, who argued that scientific theories can never be proven, only disproven. Moreover, this concept underlines the inherent uncertainty and the provisional nature of scientific knowledge. It acknowledges that our current understanding is the best approximation of truth based on available evidence. However, with the advent of new technology, discoveries, or methodologies, theories might need to be revised or replaced. This open-endedness is what drives scientific progress and is a key reason why scientists prefer terms like support over prove. It ensures that science remains a dynamic and evolving field, always open to refinement and improvement in the light of new evidence. For instance, even highly successful theories, such as the theory of gravity or the theories of evolution, are seen as subject to revision. This doesn't diminish their credibility but rather highlights the strength of the scientific method: the capacity for theories to be tested, challenged, and refined over time. This perspective is crucial for advancing our understanding of the natural world, demonstrating that scientific inquiry is an ongoing process of exploration and discovery.
Reducing the volume of a contained gas by one third, while holding temperature constant, causes pressure to Question 1 options:
Answer:
Reducing the volume of a contained gas by one third, while holding temperature constant, causes pressure to increase by 3.0 times.
Explanation:
Boyle’s Law : At constant temperature, the volume of a given quantity of a gas varies inversely with its pressure.It is clear from the data that V ∝ 1/P.Also, PV = constant.So, for two different values of both P and V:
∴ P₁V₁ = P₂V₂.
∵ V₂ = 1/3V₁
∴ P₂ = P₁V₁/V₂ = P₁V₁/(1/3V₁) = 3P₁.
The chemical reaction
2 H2O + energy → 2 H2 + O2
is
1. a synthesis reaction.
2. an endothermic reaction.
3. an exothermic reaction.
4. an ionic reaction.
In the given reaction, the energy has been utilized for the decomposition of the water molecule, hence the reaction has been termed as an endothermic reaction.
The chemical reaction can be distinguished based on the energy released or uptake by the reaction. Or can be differentiated on the basis of the reaction to be constructive or destructive.
The reaction that results in the formation of the new compound has been termed the synthesis reaction.
The reaction that requires energy for the reaction to complete is an endothermic reaction.
The reactions that release energy are termed exothermic reactions.
The ionic reaction results when the ions interact to form the ionic bond.
In the given reaction, the energy has been utilized for the decomposition of the water molecule, hence the reaction has been termed as an endothermic reaction.
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One mole of ANY element contains the: same mass as one mole of any other element same number of atoms as one mole of any other element same gram-formula-weight as one mole of any other element both the first and second choices
One mole of any element contains the same number of atoms as one mole of any other element.
How do we define moles?Moles is define as the ration of the given mass of any substance to the molar mass of that substance.
In one mole of any substance, exact 6.022 × 10²³ number of atoms of that substance will present and this number is know as the Avogadro's number. For example, in 1 mole of O₂ molecule 6.022 × 10²³ number of oxygen molecules are present.
Hence, option (2) is correct.
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The substances below are listed by increasing specific heat capacity value. Starting at 30.0 °C, they each absorb 100 kJ of thermal energy. Which one do you expect to increase in temperature the most? Silver, 0.239 J/(g °C) Aluminum, 0.921 J/(g °C) Lithium, 3.56 J/(g °C) Water, 4.184 J/(g °C)
Answer:
Silver, 0.239 J/(g °C)
Explanation:
The heat change is related to specific heat as given by the formula;Heat change = mass of substance × specific heat × change in temperature
Therefore; considering same amount of substance or equal masses and have the same initial temperature.The change in temperature will be inversely proportional to the specific heat. Therefore; the higher the specific heat lower the temperature change.Hence, the change in temperature will be highest for the substance with the lowest specific heat.Therefore; the one that will increase in temperature the most is Silver
Answer:
Silver, 0.239 J/(g °C)
Explanation:
What is the pressure exerted by 1.0 mol of a gas with temperature of 20 C and a volume of 7.5 L?
We have to assume the gas behaves similar to an ideal gas and we can use the ideal gas law equation
PV = nRT
Where
P - pressure
V - volume - 7.5 L
n - number of moles - 1.0 mol
R - universal gas constant - 0.0821 L.atm/mol.K
T - temperature in kelvin
20 degrees celcius + 273 = 293 K
Substituting the values in the equation
P x 7.5 L = 1.0 mol x 0.0821 L.atm/mol.K x 293 K
P = 3.2 atm
The pressure exerted is 3.2 atm
Which function do aspen trees serve in mountain area?
A. producers
B. scavengers
C. primary consumers
D. secondary consumers
A is your answer
They're producers, they provide nutrients for primary consumers which get eaten by secondary consumers then scavengers come in and clean up the mess :)
Aspen trees in a mountain area serve as the role of producers. They convert sunlight, water, and carbon dioxide into glucose for their survival and for providing nourishment for the primary consumers.
Explanation:In a mountain area, aspen trees serve as producers. Producers are organisms in an ecosystem that produce their own food through photosynthesis, like plants and particular forms of bacteria. Aspen trees, being plants, convert sunlight, water, and carbon dioxide into glucose which serves as their food. This process of photosynthesis not only allows aspen trees to grow and survive, but also contributes to the overall ecosystem by storing energy and providing nourishment for primary consumers. Hence, they are at the base of the food chain in respective ecosystems.
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Which phrase correctly describes temperature?
The phrase correctly describes temperature is average translation kinetic energy of the particles in an object. Therefore, option D is correct.
What describes temperature ?It is described as a measurement of the particle's typical kinetic energy inside an objective.
As a result, various kinetic energies can be experienced by particles. It may take the form of rotational kinetic energy, translational kinetic energy, or vibrational kinetic energy.
The average kinetic energy of all the atoms or molecules that make up a material is how we define its temperature. The kinetic energy of a substance's constituent particles varies.
A distribution can be used to depict the particles' kinetic energy at any particular moment.
Thus, option D is correct.
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Sort the properties of metalloids into the correct categories
(See image)
Lustrous
Solid at room temerature
In-Between Characteristics:Semiconducting
Amphoteric
Nonmetallic:Brittle
If an atom has 17 protons, 15 neutrons, and 20 electrons, what is the atom's electrical charge?
The overall charge on this ion is -3. Neutrons don’t carry a charge, while protons and electrons carry a net +1 and -1 charge, respectively. In this case, the electrons outweigh the protons by 3, making the overall charge -3.
Hope this helps!
A gas has a volume of 5 litres at 3 atm. To expand the volume to 7500 ml, what new pressure (in atm) have to be
Boyle’s law states that for a fixed amount of gas the pressure of gas is inversely proportional to the volume of the gas at constant temperature.
P1v1 = P2v2
Where P1 is pressure and v1 is volume at first instance
And P2 is pressure and v2 is volume at second instance
Substituting the values
3 atm x 5 L = P2 x 7.5 L
P2 = 2 atm
The new pressure of the expanded volume of gas is 2 atm
What is 0.045 rounded to the nearest hundredth?
0.05 would be your answer because when rounding there is one major rule which is look one place to the right for the rounding digit 5. Round up if that number is greater than or equal to 5 and round down if it is less than 5.
Therefor your answer would be 0.05.
* Hopefully this clarify everything and answers your question. Mark me the brainliest:)!!
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Consider the phase change lab what is required to bring about a phase change
Final answer:
The energy involved in a phase change depends on the number and strength of bonds or force pairs.
Explanation:
The energy involved in a phase change depends on the number and strength of bonds or force pairs. The number of bonds is proportional to the number of molecules and thus to the mass of the sample.
The energy per unit mass required to change a substance from the solid phase to the liquid phase, or released when the substance changes from liquid to solid, is known as the heat of fusion.
The energy per unit mass required to change a substance from the liquid phase to the vapor phase is known as the heat of vaporization.
The strength of the forces depends on the type of molecules. The heat Q absorbed or released in a phase change in a sample of mass m is given by:
What amount of heat is required to raise the temperature of 85.9 g of water by 7°C? The specific heat of water is 4.184 J/gºC.
Answer:
2516 J.
Explanation:
The amount of heat required to raise the T of water (Q) can be calculated from the relation:Q = m.c.ΔT.
where, Q is the amount of heat required to raise the T of water,
m is the mass of water (m = 85.9 g),
c is the specific heat of ethanol in the gas phase (c = 4.184 J/g °C),
ΔT is the temperature difference (final T - initial T) (ΔT = 7.0 °C).
∴ Q = m.c.ΔT = (85.9 g)(4.184 J/g °C)(7.0 °C) = 2516 J.
[tex]\\ \rm\Rrightarrow Q=mc\delta T[/tex]
[tex]\\ \rm\Rrightarrow Q=85.9(4.184)(7)[/tex]
[tex]\\ \rm\Rrightarrow Q=2515.83J[/tex]