Answer:C
Explanation: i did this !
Scientific Scenario #3
Monobl bra
Penny wonders if a heavier cart will roll faster down-hill than a lighter one. She forms a hypothesis and then
runs an experiment. She finds a smooth ramp and a cart and makes sure that the wheels of her cart roll freely
and sets the ramp against a chair so one side of the ramp is 0.5 m off the ground. She measures the distance
the cart will travel down the ramp and leaves 10 cm at the top of the ramp and draws a line to mark the release
position of the car. She measures the distance the cart will travel down the ramp and has a stopwatch to time
how long it will take to reach the bottom. She starts the experiment by measuring the time it takes the cart to
roll down the hill without any weight on it. For the next five trials she adds a 1 kg mass to the cart each trial
(Time Trials: 1; 27s, 2; 32s, 3; 30s, 4; 29s, 5;30s). She decides to allow for a 5 second "error factor" since she
may not have released the cart at the exact same spot each time. She finds that adding mass to the cart does
not affect the time it takes to roll down the ramp since all of her times were within 5 seconds of each other.
Following are the details of the above mentioned scientific scenario:
Hypothesis: If heavier cart rolls down faster than the lighter cart.Alternative hypothesis: Adding mass to the cart makes the cart roll down faster.Null Hypothesis: Adding mass to the cart does not make the cart roll down faster.Dependent variable: time taken for the carts to roll down the inclined ramp.Independent variable: weights on the cart.Here, she observes how the independent variable, that is the weight on the cart affects the dependent variable, that is, the time taken for the carts to roll down the inclined ramp.Control group: is the cart without any weight on it.Experimental group: is the cart with different amounts of weight on it.Hence, as a result of her experiment, Penny finds the null hypothesis to be true. This is because adding mass to the cart did not change the time it took for it to roll down.
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Convert 15.5m³ to mL
Answer:
Explanation:
1.55e+7
Amphibians have a closed circulatory system. What does this mean?
A. Fluids flow everywhere
B. Fluids stay in the lungs
C. Fluids are contained in tubes
D. Fluids do not flow
According to the research, the correct option is C. Amphibians have a closed circulatory system this means fluids are contained in tubes.
What is the circulatory system?It comprises the heart, arteries, veins and lymphatics and systems responsible for supplying oxygen and distributing blood to the different parts of the body.In this sense, amphibians are tetrapod vertebrates that develop lungs whose blood circulates through a closed circuit of arteries and veins.A closed circulatory system means that the blood, when circulating, always moves in the blood vessels, through which all the organs and regions of the body receive blood rich in oxygen.Therefore, we can conclude that according to the research, the correct option is C. Amphibians have a closed circulatory system this means fluids are contained in tubes.
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cual opcion es visible al ojo humano a simple vista kilogramo molecula mol atomo gramo
Answer:
uno
Explanation:
uno uno unooo no no Bruno capaso
Molecular scale for gas
If you were stranded on a deserted island with just the things that you have with you right now and no cellular or internet connection, what kinds of things would you need to survive?
The kinds of things that would you need to survive on a deserted island are as follows:
Fresh air for proper respiration.A healthy and balanced food.Source of water for drinking. What is Survival?Survival may be characterized as the process that supports you to exist in a place where there is a lot of difficult circumstances arise. It may be of the scarcity of food, space, etc.
According to the context of this question, for the actual and fundamental survival of life, you would not need an internet or cellular connection. But in spite of this one must require fresh air, potable water, and healthy food.
Therefore, the kinds of things that would you need to survive on a deserted island are well described above.
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Given that a mile is 1.6093km, how many kilometers do you travel if you run for a total of 43.5 minutes, 21.2 minutes of which was at the rate of 6.5 mph while the remaining 22.3 minutes was run at 7.8 mph?
The number of kilometers you travelled in 43.5 minutes is 8.4 Km
What is speed?Speed is defined as the distance travelled per unit. Mathematically, it can be expressed as:
Speed = distance / time
With the above formula, we can determie the distance (in Km) travelled. Details below.
We'll begin by calculating the distance (in Km) travelled in 21.2 mins. This is shown below:
Time = 21.2 mins = 21.2 / 60 hourSpeed = 6.5 mph = 6.5 × 1.6093 = 10.46045 Km/hDistance =?Speed = distance / time
Cross multiply
Distance = speed × time
Distance = 10.46045 × (21.2 / 60)
Distance = 3.7 Km
Next, we shall obtain the distance (in Km) travelled in 22.3 mins. This is shown below:
Time = 22.3mins = 22.3 / 60 hourSpeed = 7.8 mph = 7.8 × 1.6093 = 12.55254 Km/hDistance =?Speed = distance / time
Cross multiply
Distance = speed × time
Distance = 12.55254 × (22.3 / 60)
Distance = 4.7 Km
Finally, the total distance travelled can be obtained as follow:
Distance in 21.2 mins = 3.7 KmDistance in 22.3 mins = 4.7 KmTotal distance =?Total distance = 3.7 + 4.7
Total distance = 8.4 Km
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Which chemical equation follows the law of conservation of mass?
OA. LIOH + H₂CO3 → Li₂CO3 + 2H₂O
->
OB. 2LIOH + H₂CO3 → Li₂CO3 + H₂O
OC. 2LIOH + H₂CO3 LICO3 + 2H₂O
-
-
OD. 2LIOH + H₂CO3 → Li₂CO3 + 2H₂O
The chemical equation that follows the law of conservation of mass is as follows: 2LiOH + H₂CO3 → Li₂CO3 + 2H₂O (option D).
What is the law of conservation of mass?The law of conservation of mass states that mass can neither be created nor destroyed.
This law further explains that in a chemical reaction, the amount of mass in the reactants must be equal to the amount of mass in the products.
This means that the chemical equation must be balanced i.e. the number of moles of atoms of each element on both sides of the equation must be the same.
According to this question, the chemical equation that is balanced is 2LiOH + H₂CO3 → Li₂CO3 + 2H₂O, therefore, represents the law of conservation of mass.
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someone please help me figure out the significant figure
If you add a chunk of zinc to a beaker of acid and zinc shavings to another beaker of acid, the sample with the zinc shavings will react faster. What property causes the increase in rate?.
The property that causes the zinc shavings to react faster than the chunk of zinc is called the surface area.
When performing any type of chemical reaction, the surface area is an important aspect to take into account because it significantly affects the reaction's rate. The rate of reaction increases with decreasing surface area.
When compared to zinc shavings, which have been broken down into zinc particles with smaller surface areas, a chunk of zinc is similar to a body of stone held together by strong bonding.
In comparison to the huge chunk of zinc, the reactive surface area of the zinc shavings is smaller. Reactants' lower surface areas make it necessary for them to be in close contact with the acid solution for the reaction to occur.
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What would happen to the conductivity of the ionic solutions if you were to mix in a covalent compound such as sugar or one of the covalent solutions.
If we mix sugar to a already prepared solution with ionic material the conductivity of ionic solution will not change.
Ionic compound conduct electricity in water or liquid because there ions are free to move.Ionic compound are made up of electrically charged ions or ions are free to move , thus they conduct electricity. when ionic solution dissolve in water , the ions get separated and disappears across the solution.this ions helps in conducting electricity in the solution.
Covalent compounds are formed by the sharing of electrons . so. in covalent compounds ions are not present to conduct electricity.
Thus,If we mix sugar or one of the covalent solution to a already prepared solution with ionic material, the conductivity of ionic solution will not change.
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Bombardment of uranium-238 with a deuteron (hydrogen-2) generates neptunium-237 and __________ neutrons.
a. 1
b. 2
c. 3
d. 4
e. 5
Bombardment of uranium-238 with a deuteron (hydrogen-2) generates neptunium-237 and 3 neutrons.
What is a neutron?With the sign n or n0, the neutron is a subatomic particle with a neutral charge and slightly more mass than a proton. It is made up of two down quarks and one up quark as a composite particle. Atomic nuclei are mainly composed of neutrons & protons.
They are both referred to as nucleons because protons and neutrons exhibit comparable behaviors inside the nucleus and have masses of around one atomic mass unit apiece. Nuclear physics describes these objects' characteristics and interactions.
The arrangement of electrons in orbit around an atom's heavy nucleus is a major factor in determining its chemical characteristics. The charge of the nucleus, or atomic number, which determines the number of protons, or protons, determines the electron configuration.
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an electron and a proton are separated by a distance of 1.8×10−10 m1.8×10−10 m (roughly the diameter of a single atom). the masses of the electron and proton are me
The electric force is 2.33 × 10⁴⁹ times greater than the gravitational force.
Gravitational Force is defined as the force of magnet between any two bodies is directly commensurable to the product of their million and is equally commensurable to the forecourt of the distance between them.
Gravitational force is directly proportional to the weight of the two bodies.
Now,
The gravitational force in the middle of the proton and the electron is obtained from;
Fg = G m mp / r²
Where ,
me = mass of the electron
mp = mass of the proton
r = distance of separation
Fg = (6.67 x 10⁻¹¹ Nm² / C²) x (9.11 × 10⁻³¹) × 1.673 ×10⁻²₇/(1.8 × 10⁻¹⁰)²
Fg = 3.86 × 10⁻⁵⁸ N
For the electric force;
Fe=K e²/r²
Where,
K = electric constant
e = magnitude of charge on electron and proton
r = distance of separation
Fe = 8.988 × 10⁹x (1.602×10⁻¹⁹)² /(1.8×10⁻¹⁰)²
Fe = 7.10 × 10⁹ N
Hence, the number of time the electric force is stronger than the gravitational force = 9× 10⁻⁹ N/3.04 × 10⁻⁵⁸ N = 2.33 × 10⁴⁹times
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Neon and argon are both elements in a group of similar elements called noble gases. What properties do these elements have that make them unique?.
Answer:
they are stable
Explanation:
stable means they donot want to give or to accept electron. so that makes them stable
5.0 ml of 0.10 m solution of naoh is added to 30. ml of buffer solution of acetic acid (0.093m) and sodium acetate (0.12 m). what is the ph of new solution? ka
5.0 mL of 0.10 M solution of NaOH is added to 30.0 mL of buffer solution of acetic acid (0.093 M) and sodium acetate (0.12 M). So, the pH of the new solution is 4.72
The balanced chemical equation of reaction :
CH₃COOH +H₂O → H₃O⁺ + CH₃COO⁻
kₐ = [H₃O⁺] [CH₃COO⁻] / [CH₃COOH] [H₂O]
[H3O+] = kₐ X [CH3COOH] / [CH3COO-] → 1
Let's consider the concentration of H₃O⁺ at equilibrium is x.
So,
Putting the values in equation-1
[H3O+] = ka X [CH3COOH] / [CH3COO-]
x = (1.8 X x 0.00329) / (0.0031)
x = 1.91 X
since, x is the equilibrium concentration of H₃O⁺,
So,
equilibrium concentration of H₃O⁺ = 1.91X
pH = -log 10 [H3O+]
pH = -log 10 [1.91x]
pH =4.72
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A compound consists of 37. 51 g c, 4. 20 g h, and 58. 29 g o. What is the empirical formula?.
A compound has 58. 29 g of oxygen, 4. 20 g of h, and 37. 51 g of carbon. The empirical formula is C6H8O7.
What is an empirical formula?Empirical formulas are those that provide proportions of the constituent elements of a compound but not the precise number or arrangement of atoms.
This can be done by calculating molar ratio of elements using masses and molar masses of the element.
Mass of the Carbon (C) in given compound is= 37.51g
Mass of the Hydrogen (H) in given compound is= 4.20g
Mass of the Oxygen (O) in given compound is= 58.29g
Molar mass of C = 12.0107g
Molar mass of H = 1.00784g
Molar mass of O = 15.999g
by diving the mass of the elements with their respective molar masses we get number of moles of elements:
no. of moles of C= 37.51/12= 3.123moles
no. of moles of H= 4.20/1.00784 =4.167moles
no. of moles of O = 58.29/15.999 = 3.643moles
Molar ratio of elements/atoms can be obtained by diving the above number of moles with the lesser number of moles in the above three,
C= 3.123/3.123
H= 4.167/3.123
O= 3.653/3.123
Each ratio is multiplied by "6" to produce a complete number:
C= 1*6
H= 1.334*6
O= 1.166*6
The empirical formula is= C6H8O7.
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5. extend your thinking: first, using the balance, find the mass of a pumpkin on jupiter. then
place the pumpkin on the spring scale and record its weight. finally remove the pumpkin
and weigh the masses from the balance on the spring scale. how do the weights compare?
mass= 3060g weight= 75.9n
The pumpkin mass 3060 g and weight in Jupiter is 75.9 N . so, the mass of pumpkin in earth is 3060 g and the weight of pumpkin is 30.0 N.
Mass will remain same in every planet but weight changes because of force of gravity. Mass do not change with change in place. Mass is measured as the amount of matter present in body.
mass of pumpkin will not change because the amount of matter does not change. the mass of pumpkin in Jupiter is 3060 g and it will remain same for earth , 3060 g.
Weight of an object is defined as the amount of force acting on a mass due to the acceleration due to gravity.
mass of pumpkin in earth = 3060 g = 3.060kg
Weight (W) = mass of object × acceleration of gravity
= 3.060 × 9 .86
= 30.0 N
thus,The pumpkin mass in Jupiter is 3060 g and weight in Jupiter is 75.9 N . so, the mass of pumpkin in earth is 3060 g and the weight of pumpkin is 30.0 N.
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Desublimation examples
Some examples of Desublimation include
Formation of frost in the windows during winters.Deposition of soot in chimneysSnow FormationCarbon-di-oxide gas inside the fire extinguisher is stored under high pressure, when released the gas converts into solid and expels out as white powder.Desublimation is a reverse process of sublimation in which the phase transition of a substance from gas to solid takes place directly without going through the liquid phase.
Desublimation is an example of exothermic phase change that occurs at temperatures and pressures below a substance’s triple point in its phase diagram.
Desublimation is also called as deposition. It occurs mainly by a drastic loss in thermal energy from the surrounding gas due to the presence of a much cooler surface.
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controllable and scalable synthesis of hollow-structured porous aromatic polymer for selective adsorption and separation of hmf from reaction mixture of fructose dehydration
Controllable and scalable synthesis of hollow - structured porous aromatic polymer for selective adsorption and separation of hmf from reaction mixture of fructose dehydration is H-PAP show exclusive adsorption , without adsorption of fructose and HMF with high purity from reaction mixture of fructose dehydration is recovered.
Hollow structure porous aromatic compound H-PAP with cavity were controllably prepared through surface coating and etching method under scalable synthesis. It is found that the fill factor (f) of a reactor is an important parameter for finding scalability of synthesis. the well developed H-PAP as adsorbent was investigate in adsorption of HMF (5-hydroxymethylfurfural) under static mode from single component to multi component aqueous solution. in the case of HMF adsorption from real reaction mixture of acid catalyzed fructose dehydration with high purity (94.4%) recovered.
thus,in controllable and scalable synthesis,HMF with high purity from reaction mixture of fructose dehydration is recovered.
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Determine the number of atoms in 31. 0 grams of bromine, br. (the mass of one mole of bromine is 79. 90 g. )
By Avogadro's number, the bromine atoms are 2.34 × 10²³ atoms.
We need to know about Avogadro's number to solve this problem. Avogadro's number is the number that explains how many atoms are in one mol. The Avogadro's number is
Na = 6,02 × 10²³ atoms / mol
From the question above, we know that
gr = 31 grams
Mr = 79.9
Find the amount of bromine in moles
n = gr / Mr
n = 31 / 79.9
n = 0.39 mole
By using Avogadro's number, we can calculate how many bromine atoms
N = Na . n
N = 6,02 × 10²³ x 0.39
N = 2.34 × 10²³ atoms
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PLEASE HELP VERIFIED PEOPLE
Which of the following compounds is a base?
Select one:
a. HNO3
b. HCl
c. Al(OH)3
d. H2SO4
Answer:
I'm not verified but I do know that HNO3 is a base and a potent acid
Explanation:
It is used as a nitrating agent. because its base is more stable its stronger than nitrous acid HNO3 can be made by the formula NO 2 + H 2O → 2 HNO 3 + NO (the reaction of NO2 with water). it can be used to produce ammonium nitrates to make plastic, dye, and fertilizers, make explosives and a oxidizer in liquid-fueled rocket thrusters.
b. Complete the table to show the effect of each change on the gravitational
force between two objects. (2 points)
Change
Multiply one of the masses by 2.
Multiply the distance by 2.
Effect on gravitational force
The gravitational force of attraction is 4.2 * 10^23 N.
What is the gravitational force?The gravitational force is a force that acts on objects that are within the earth’s gravitational field. We know that the gravitational force is an attractive force and it acts on the mass as it is in the universe.
The force of gravity has its direction as towards the center of the earth. Knowing that;
F = Gm1m2/r^2
F = gravitational force
G = gravitational constant
M1 and M2 = masses of the objects
Hence;
When one of the masses is multiplied by 2, the magnitude of the gravitational force is doubled.
When the distance of separation is multiplied by 2, the magnitude of the gravitational force decreases by a factor of 4.
Now let us obtain the magnitude of the gravitational force;
F = 6.6743 × 10-11 * 1.90 * 10^27 * 1.99 * 10^30/(7.78 * 10^11)^2
F = 4.2 * 10^23 N
The gravitational force of attraction is 4.2 * 10^23 N.
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Explain how writing the formula (ex. h2o + nacl) for a pure substance differs from writing the formula for a mixture.
A pure substance has a definite chemical formula. However, a mixture does not have a constant component ratio and hence cannot be described by a fixed formula.
A pure substance comprises only one type of matter. This can be a single element or a single compound, but each sample of this substance examined must have the same thing with a fixed, specific set of qualities.
In contrast, a mixture is referred to as a combination of two or more pure components. Because the atoms of the constituent substances are not chemically bound, mixtures may always be divided back into their constituent pure components.
Whereas a compound may have properties that are significantly different from the constituent's elements, however, mixtures retain their original properties.
Examples are chlorine, a strong green gas, and sodium, a soft, silvery metal. Together, these two elements can create sodium chloride (table salt), a white, crystalline substance that possesses neither the characteristics of sodium nor those of chlorine. However, if we combined ground pepper with table salt, we would still be able to distinguish the individual grains of each of them.
That's why pure substance has a definite chemical formula. However, a mixture does not have a constant component ratio and hence cannot be described by a fixed formula.
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question hydrogen bonds form between adjacent water molecules because the charged hydrogen end of one water molecule attracts the charged oxygen end of another water molecule. negatively, positively negatively, positively positively, positively positively, positively positively, negatively positively, negatively negatively, negatively
The positively charged hydrogen end of one water molecule pulls the negatively charged oxygen end of another water molecule, forming hydrogen bonds between the two neighboring water molecules.
How does hydrogen bonding work?
Instead of forming a covalent bond with an atom of hydrogen, molecules are attracted to one another by a process known as dipole-dipole attraction.
It is brought about by the attractive attraction between two very electronegative atoms, such as an N, O, or F atom and a hydrogen atom covalently bound to one of them.
Hydrogen bonds may form in any molecule when an oxygen or nitrogen atom is directly connected to a hydrogen atom.
Hydrogen bonds also arise when hydrogen is linked to fluorine.
Since hydrogen bonds are essential for the structure and characteristics of DNA, they play a crucial role in biology.
These bonds are what bind the nucleotide base pairs here on two strands of DNA together.
Hydrogen bonds develop between two water molecules when one's positively charged hydrogen side pulls in the other's negatively charged oxygen end.
the answer is positively and negatively respectively.
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pressure only affects solubility of a substance in the ____ phase, not the ____ phase.
Pressure only affects the solubility of a substance in the gaseous phase, not the liquid or solid phase.
What is Solubility?Solubility may be defined as the maximum amount of any substance that will significantly dissolve in a definite amount of solvent at a specified temperature. It is the property of substances that shows their ability to intermingle with other substances known as solvents.
According to the context of this question, liquids and solids exhibit practically no alteration in solubility with respect to changes in pressure. But when you enhance the pressure of a gas phase, the collision frequency between its particles increases, and thus the solubility goes up, as you reduce the pressure, the solubility goes down.
Therefore, the pressure only affects the solubility of a substance in the gaseous phase, not the liquid or solid phase.
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HELP ME IM GIVING BRAINLEST!!
Answer: 17, Si
Explanation:
Can someone write an essay for me requiring
sustainability problems in Canada
Climate change, Natural resource use, Waste production, Water pollution, Ocean acidification and Air pollution are the sustainability problems in Canada as well all over the world.
What are the sustainability problems in Canada?Climate change is the major change that occur in Canada because of the extensive use of fossil fuels and the release of other pollutants. This climate change leads to change the precipitation pattern in Canada. The extensive use of natural resource and production of waste material are also serious problems in Canada. Due to waste production, water is polluted because the waste is disposed in the water bodies which leads to acidification of ocean and serious threats to aquatic animals and plants.
So we can conclude that Climate Change, Natural Resource Use, Waste Production, Water Pollution, Ocean Acidification and Air Pollution are the sustainability problems in Canada as well all over the world.
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the hybridization of one s and one p orbital will result in the formation of sp hybrid orbitals. this will leave unhybridized p orbital(s), which is/are at right angles to the hybrid orbitals. the formation of a group of sp2 hybrid orbitals leaves unhybridized p orbital(s).
A substance has a pH of 8.0. How would it be classified? (1 point)
O strong acid
O strong base
O weak acid
O weak base
Answer:
Strong base
Explanation:
Answer: weak base
Explanation:
How many total atoms are in 0.310 g of P2O5?
Answer:
1.314E21 atoms
Explanation:
.310 / 142 = .002183
.002183 x 6.02E23 = 1.314E21