Final answer:
Molarity, symbolized by M, is the moles of solute per liter of solution and is useful for stoichiometric calculations. Molality, symbolized by m, is the moles of solute per kilogram of solvent and is beneficial for temperature-dependent calculations like boiling point elevation. Both have distinct units, molarity in mol/L and molality in mol/kg.
Explanation:
The difference between molarity and molality lies in their definitions and units of measurement. Molarity, denoted by the symbol M, is a measure of concentration defined as the number of moles of solute per liter of solution (mol/L). It is commonly used in chemistry to discuss reactions where solute is a reactant or product, allowing conversion from moles to grams using molar mass.
On the other hand, molality, represented by the symbol m, is defined as the number of moles of solute per kilogram of solvent (mol/kg). Molality is independent of temperature and pressure because it's based on mass, which is particularly useful when dealing with reactions that involve significant temperature changes. For example, in calculating the freezing point depression or boiling point elevation, molality is used due to its temperature-independent nature.
Example of molarity: To determine the amount of sodium chloride needed to prepare 2 liters of a 0.5 M NaCl solution, you would use the formula M=moles/L and rearrange it to calculate moles = M × L. Therefore, you need 1 mole of NaCl (0.5 moles/L × 2 L).
Example of molality: When calculating the change in boiling point of water with a dissolved non-volatile solute, molality is used to determine the moles of solute per kilogram of water, which can then be plugged into the boiling point elevation formula.
true or false surface tension is a property of gases
In which of the following states of matter are the particles close together but loosely connected so they can flow?
A certain organic compound is made up of the amino acids methionine, arginine, and leucine. Which type of organic compound is this?
B. The-protein---------
Which number represents an acidic pH, 4 or 9? ______
The hang time of a basketball player who jumps a vertical distance of 2 feet (0.6 m) is about 2/3 second. What will be the hang time if the player reaches the same height while jumping 4 feet (1.2 m) horizontally?
A basketball rolls to a stop along a gym floor without anyone touching it. What answer choice BEST explains why this occurred?
A) The initial force that started the ball ran out.
B) The opposing force of friction stopped the ball.
C) The natural state of the ball is not to be in motion.
D) The force of gravity slowed the ball until it stopped.
Tell me if i'm wrong
Answer: The correct option is B.
Explanation:
In the given problem, a basketball rolls to a stop along a gym floor without anyone touching it.
The basketball stops own its own because of the force of friction. Friction is a force which opposes the motion of the object. The direction of the force of friction is in an opposite direction to the motion of the object.
The frictional force will act between the basket ball and the floor.
Therefore, the correct option is B.
If the force of the explosion was focused onto a smaller _____ of the window, then the pressure of the explosion on the window would be even greater.
length
area
volume
density
Answer: The correct answer is Area.
Explanation:
Pressure exerted on an object is defined as the ratio of force applied to the surface area.
Mathematically,
[tex]p=\frac{F}{a}[/tex]
Where, p = pressure
F = force applied
a = surface area
From the above relation, pressure is inversely related to area. As, the pressure increases, the area will be small and vice-versa.
So, when force of the explosion was focused on a smaller area, then the the pressure of the explosion on the window was greater.
Hence, the correct answer is Area.
Two blocks connected by a rope of negligible mass are being dragged by a horizontal force (see figure below). Suppose F = 65.0 N, m1 = 14.0 kg, m2 = 26.0 kg, and the coefficient of kinetic friction between each block and the surface is 0.098
Determine the acceleration of the system
Final answer:
To find the system's acceleration, subtract the total frictional force from the applied force and divide by the total mass. The acceleration is calculated to be 0.665 m/s².
Explanation:
The question asks to determine the acceleration of a system comprising two blocks connected by a rope, being dragged by a horizontal force. Given are the total force (F = 65.0 N), the masses of the two blocks (m1 = 14.0 kg and m2 = 26.0 kg), and the coefficient of kinetic friction (μ = 0.098).
To find the acceleration, we need to consider the net force acting on the system, which involves subtracting the force due to friction from the applied force. The force of friction (f) can be calculated using f = μ * m * g, where g is the acceleration due to gravity (approximately 9.8 m/s²). Hence, the total mass (m) of the system is m1 + m2 = 40.0 kg, resulting in a total frictional force of f = 0.098 * 40.0 * 9.8 = 38.4 N.
The net force (Φ) acting on the system is therefore the applied force minus the frictional force, which is 65.0 N - 38.4 N = 26.6 N. The acceleration (a) can be found using Newton's second law (Φ = m * a).
Thus, the acceleration of the system is a = Φ / m = 26.6 N / 40.0 kg = 0.665 m/s².
in the system to the right, the pulleys are frictionless and the system hangs in equilibrium. Determine the values of each of the unknown weights.
In a frictionless pulley system in equilibrium, the sum of the forces equals zero. To find the unknown weights, set up a balance of forces equation, following Newton's second law, and solve for the unknown.
Explanation:In a frictionless pulley system hanging in equilibrium, the sum of the forces in the system is equal to zero as there is no net force acting in any direction. This is derived from Newton's second law. So, to determine the unknown weights in this equilibrium system, you will need to set up a balance of forces equation. For example, if we have a pulley system with weights W1, W2, and W3, where W1 and W3 are known and W2 is unknown, we can set up the following equation according to Newton's law: W1 + W2 = W3. Solving this equation will give us the value of the unknown weight W2.
Learn more about Balance of Forces here:https://brainly.com/question/34229844
#SPJ13
if an object is moving then the magnitude of it _____ cannot be zero
A. speed
B. velocity
C. acceleration
B. A and B
E. A,B, and C
How did the theory of relativity change the law of conservation of energy?
It stated that energy could be transformed into matter, therefore the amount of matter equals the amount of energy.
It stated that matter could be transformed into energy, therefore the amount of matter equals the amount of energy.
It stated that energy could be transformed into matter, therefore the amount of matter and amount of energy together are conserved.
It stated that matter could be transformed into energy, therefore the amount of matter and amount of energy together are conserved.
The theory of relativity merged the conservation of matter and energy into a single concept where mass can be converted into energy and vice versa, altering the classical conservation of energy law to include mass-energy equivalence. Thus, it stated that matter could be transformed into energy, therefore the amount of matter and amount of energy together are conserved.
The theory of relativity transformed the law of conservation of energy by introducing the concept that matter could be transformed into energy, and vice versa. Albert Einstein's famous equation [tex]E = mc^2[/tex] highlights the equivalence of mass (matter) and energy, thus redefining the principle of conservation. Essentially, it stated that the total amount of matter and energy together are conserved, not each separately, allowing for the conversion from one to the other. This redefinition of energy to include the possibility of mass changing into energy is fundamentally important in fields such as nuclear physics, where reactions within a nuclear reactor exemplify this interchange.
Thus, it stated that matter could be transformed into energy, therefore the amount of matter and amount of energy together are conserved.
1. Moving from left to right across a row of the periodic table, which of the following values
increases by exactly one from element to element?
(1 point)
isotope number
atomic number
atomic mass unit
mass number
2. The atomic mass of an element is (1 point)
the sum of the protons and neutrons in one atom of the element.
twice the number of protons in one atom of the element.
a ratio based on the mass of a carbon-12 atom.
a weighted average of the masses of an element’s isotopes.
3. Which general statement does NOT apply to metals? (1 point)
Most metals are ductile.
Most metals are malleable.
Most metals are brittle.
Most metals are good conductors of electric current.
4. Group 7A of the periodic table contains the (1 point)
most reactive nonmetals.
most reactive metals.
least reactive nonmetals.
least reactive metals.
5. The unit for atomic mass is (1 point)
gram.
amu.
pound.
none of the above
all of those are right but #2 is a weighted average of the masses of an element's isotopes.
Helium is considered a noble gas because it has a _blank___ valence electron shell
Which of the following is the best example of proper hypothesis?
A. I think there is no effect on hearing if you listen to loud music only 3 hours a day.
B. Children who wear backpacks do better academically.
C. Orange popsicle taste sweeter than grape popsicles.
D. If two object are dropped at the same height ,the heavier objectwill got first.
I believe that the correct answer is D
Aliens from planet Moby have three alleles for skin color: R (red) W(white) and B (Blue). If all of these alleles are codominant and aliens on planet moby can only inherit two alleles for a gene, what are the six possible genotypes for skin color in these aliens?
The aliens from planet Moby can present six possible genotypes resulting from combinations of the three codominant alleles R, W, and B: RR, WW, BB, RW, RB, and WB. Each genotype would result in a unique phenotype, with RW being a mix of red and white, RB a mix of red and blue and WB a mix of white and blue. This is an example of a multiple allele system, which is basic to studying genetics.
Explanation:Because aliens from planet Moby can only inherit two alleles for a gene and all the alleles (R for red, W for white, and B for blue) are codominant, the six possible genotypes would be: RR - for red, WW - for white, BB - for blue combinations like RW - for red and white, RB - for red and blue, and WB - for white and blue. It's worth noting that in this codominant system, each genotype corresponds to a unique phenotype completely different from the others.
For instance, the genotype 'RW' would be expressed as a mix of red and white, 'RB' would be a mix of red and blue, and 'WB' would be a mix of white and blue. Such systems where multiple alleles are controlling a single trait are known as multiple allele systems, and they often display more than just two phenotypes in the population.
Understanding multiple allele systems and codominant systems is a fundamental aspect of the study of genetics. This knowledge helps scientists understand genetic diversity and inheritance patterns among populations more comprehensively.
Learn more about Codominance and Multiple Allele Systems:https://brainly.com/question/14525046
#SPJ3
velocity is a description of both speed and direction therefore it is________
the same as acceleration
a vector
a force arrow
a magnitude
Answer: a vector
Explanation:
In physics, there are two types of quantities:
- scalars: scalar quantities are characterized by a magnitude only. Examples of scalars are: mass, time, length, and speed
- vectors: vector quantities are characterized by both a magnitude and a direction. Examples of vectors are: force, displacement, and velocity.
Velocity, in fact, is a vector, because it includes:
- a magnitude, which is the speed, given by the ratio between displacement and time taken: [tex]v=\frac{s}{t}[/tex]
- a direction
The table shows the percentages of hydrocarbons that are found in a sample of crude oil.
Hydrocarbons
Percentage
Paraffins
30
Naphthenes
49
Aromatics
15
Asphaltics
6
Based on the given information, what is the best classification for this sample of crude oil?
an element
a pure compound
a pure substance
a mixture
Answer:
It is a mixture.
Explanation:
Crude oil is obtained from the earth.
It is a mixture of several substances.
The substances can be obtained by the fractional distillation, because they all have different melting and boiling points.
Answer:
Option (4)
Explanation:
Crude oil is referred to the fossil fuel that is formed from the burial of ancient flora and fauna. These are often found to be trapped in the sedimentary type of rocks such as sandstone and limestone.
These are a highly complex mixture of hydrocarbons, comprised of paraffin, naphthenes, asphalts and some other aromatic hydrocarbons. They are also found to contain a low amount of sulfur and some trace amounts of nitrogen as well as oxygen compounds.
These oils can also be refined in order to make diesel, petrol and gasoline.
Thus, the correct answer is option (4).
Amy has a mass of 30 kg, and she is riding a skateboard traveling 5 m/s. What is her momentum?
a 500 G ball and a 200 g or dropped from a tower. Those balls are the same size and there is no air resistance. Which one hits the ground first?
the 500 g
the 200g
they both hit at the same time
Ignoring air resistance, both the 500g ball and the 200g ball will hit the ground at the same time. This is due to the principle confirmed by Galileo that all objects fall with the same acceleration due to gravity, regardless of their mass.
Explanation:Based on the principles of physics and specifically the law of gravity, both the 500g ball and the 200g ball would hit the ground at the same time if air resistance is negligible. This surprising fact was experimentally proven by Galileo Galilei who demonstrated that all objects—regardless of their mass—fall towards the Earth with the same constant acceleration when there's no air resistance or friction to slow down their descent. In other words, the mass of the objects does not affect the time it takes for them to reach the ground when dropped from the same height in a vacuum.
For instance, consider the famous demonstration on the moon by astronaut David R. Scott in 1971, he dropped a hammer and a feather in the vacuum of space and both hit the lunar surface at the same time, proving that the acceleration due to gravity impacts all objects equally, regardless of their mass, when there is no air resistance.
However, in the real world where air resistance exists, a lighter object can fall slower than a heavier object of the same size. But for this particular scenario where air resistance is considered negligible, both the 500g and 200g balls would indeed hit the ground simultaneously.
Learn more about Gravity here:https://brainly.com/question/31321801
#SPJ2
A rock is thrown horizontally at a speed of 5.0 m/s from the top of a cliff 64.7 m high. The rock hits the ground 18.0 m from the base of the cliff. How would this distance change if the rock was thrown at 10.0 m/s?
Sample Response: If the rock was thrown at 10.0 m/s, the rock would land twice as far from the cliff as it did previously.
Explanation:
Doug is doing work. Without knowing exactly what he is doing, which can be said about the work he is doing? Energy is transferred; Energy is increased; Energy is decreased; Energy is unchanged;
The answer is Energy is transferred! I just took the test and your answer was Energy is decreased and that was not correct!
jim makes an electromagnet by wrapping a copper wire around a nail and then connecting it to a battery. if he brings the end of the nail near a pile of paper clips, which of the following will happen?
the paper clips will be magnetically attracted to the nail
Predictions about the future based on the position of planets is an example of
Answer: Astrology
Astrology is the study of the position and movement of planets, sun, moon and stars which affect the lives and character of an individual. It claims to predict the future events of the living individual as well as the natural events that may occur in it's surrounding environment. The roots of astrology comes from calendrical systems which can help in predicting the seasonal shifts and to interpret the celestial cycles of the objects in space.
A scientist plans to find out the percent of teenagers who like science. She interviews 500 teenagers leaving a science museum and finds that 450 of them like science. The scientist concludes that 90 percent of teenagers like science. Why is the scientist's conclusion most likely unreliable? adults were not interviewed the investigation was time consuming the source of information was biased very few teenagers were interviewed
She is good if the population is more than or equal to 10 times 150 or 10 times 150. That is a question we don't know the answer to because we don't know the size of the student body at the school. She might have been too big, thus we need the end times.
What interviews 500 teenagers leaving a science museum?The information came from a biased source. Like asking everyone you meet if they enjoy fishing while strolling along a country riverbank. Or by asking the 500 spectators in the stands if they enjoy baseball.
She will assume that the population is 0.72 if I multiply 100 and 50 by 500.72, and I will multiply 100 and 50 by 0.28. I was hoping it was 100 and 8. I scribbled down the number 100. 42 is more than 10.
Therefore, If the scientist had spoken with 500 kids at a rock concert or at the local basketball courts, I'm confident that she would have obtained different results.
Learn more about teenagers here:
https://brainly.com/question/3235532
#SPJ2
Homogeneous mixtures can exist A) only in the gas phase. B) only in the solid phase. C) as liquid, solid, or gas. D) only in the liquid phase
The answer is c. as liquid,solid, or gas.
C) as liquid, solid, or gas.
Explanation;A mixture is a substance that is made up of two or more substances. A mixture may be either homogeneous or heterogeneous.A homogeneous mixture is a mixture in which the components are uniformly distributed. This means there is only one phase of matter, hence a homogeneous mixture can exist as a solid, gas or liquid.A heterogeneous mixture on the other hand is a type of mixture in which the components making the mixture are not uniform. A heterogeneous mixture contains more than one phases of matter. These types of mixtures may be either suspensions or colloids.who are a congressional representative's Constituents
A congressional representative's constituents are the people whom they are elected to represent. The representatives' interactions with their constituents can be based on a delegate or trustee approach, where either they enact the wishes of their constituents or make decisions using their judgment while bearing their constituents' interests in mind. The task of effectively balancing their constituents' needs and concerns with the larger national landscape is a central facet of a representative's role.
Explanation:A congressional representative's constituents are the people whom they are elected to represent in their district. This relationship between the representatives and their constituents takes various forms, including the delegate model of representation, where legislators act based on the preferences of their constituents. The representative may share demographic and other characteristics with their constituents, allowing them to better understand and address the specific needs and concerns of their community.
The relationship between a representative and the constituents can be influenced by multiple factors, including whether the representatives view themselves as delegates or trustees. In the delegate model, representatives see their role as enacting the wishes of their constituents, which they must identify and then vote accordingly. Representatives can also adopt the approach of 'trustee,' where they use their judgment to make decisions on behalf of their constituents. Either way, a representative's paramount duty is to address the concerns of their constituents.
However, the needs of the constituents must be balanced with the demands of the larger political landscape, which can cause tensions. The ability of a representative to maintain this balance - of being part of a national legislative body and being a representative of a smaller community - is crucial to their success in their role. Nonetheless, every member of a legislature has an obligation to their constituents, and their efforts to serve them form a significant part of their duties.
Learn more about Congressional Constituents here:https://brainly.com/question/14408651
#SPJ12
PLEASE HELP I WILL GIVE BRAINLIEST Which substances will make a salt when combined? Vinegar and tea Soda and wine Soda and ammonia Fertilizer and detergent
in a communist economic system the production and distribution of goods is determined by
Why couldn't Mendeleev organize the entire periodic table during his research? Question options: The elements showed no periodic properties. The atomic number was unknown at the time. Some elements were undiscovered at the time. The atomic mass was unknown at the time.
Answer:
Correct Answer:
Some elements were undiscovered at the time.
Explanation: This is straight from the test.
How would you describe the relationship between the mass of a car and its kinetic energy? A) As the mass of a car increases, its kinetic energy increases. B) As the mass of a car increases, its kinetic energy decreases. C) As the mass of a car decreases, its kinetic energy increases. D) There is no clear relationship between mass and kinetic energy.
Answer:
The answer is A.As the mass of a car increases, it's kinetic energy increases.
Explanation: