The Jim passes a 1.5 kg basketball of 60 N. The acceleration is 40 m/s². Therefore, option A is correct.
What is acceleration ?Acceleration is the rate at which an object's velocity with respect to time changes. They are vector quantities, accelerations. The direction of the net force acting on an object determines the direction of its acceleration.
Acceleration is the rate at which the speed and direction of a moving object vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates. Even if the speed is constant, motion on a circle accelerates because the direction is always shifting.
A = F / m
= 60 / 1.5
= 40 m/s²
Thus, option A is correct.
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How many moles of chlorine are present in 3 moles of MgCl2
The amount, in moles, of chlorine that would be present in 3 moles of [tex]MgCl_2[/tex] would be 6 moles.
Stoichiometric problem[tex]MgCl_2[/tex] is made from magnesium and chlorine molecules according to the following equation:
[tex]MgCl_2 --- > Mg^{2+} + 2Cl^-[/tex]
From the above equation, 1 mole of [tex]MgCl_2[/tex] is made up of 1 mole of Mg and 2 moles of Cl.
Following this established ratio, the amount of chlorine that would be present in 3 moles of [tex]MgCl_2[/tex] can be calculated as follows:
1 mole [tex]MgCl_2[/tex] = 2 moles of Cl
3 moles [tex]MgCl_2[/tex] = 2 x 3/1
= 6 moles of Cl
In other words, 6 moles of Cl would be present in 3 moles of [tex]MgCl_2[/tex].
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list at least Three chemical reactions that occur in making bread
Explanation:
Fermentation: When yeast is added to the dough, it begins to ferment the sugars present in the dough, producing carbon dioxide and ethanol. The carbon dioxide helps to leaven the dough, while the ethanol is mostly evaporated during baking.
Maillard reaction: During baking, the heat causes a reaction between the amino acids and sugars in the dough, producing a wide range of compounds that give bread its characteristic flavor and aroma. This reaction is known as the Maillard reaction.
Protein denaturation: The heat of baking causes the proteins in the dough to denature, or lose their native conformation. This helps to give bread its texture and structure, and also contributes to the development of its crust.
The rate of effusion of substance A is 3 times the rate of effusion of substance B. If the molar mass of substance A is 4.00 g/mol, what is the molar mass of substance B?
The rate of effusion of substance A is 3 times the rate of effusion of substance B, and molar mass of A is 4g/mol, then molar mass of B is 36g/mol.
Graham Law:
The rate of effusion of a gaseous substance is inversely proportional to the square root of its molar mass. This is called Graham's Law
R = k/√M
where k is constant and m is molar mass of the substance.
rate of effusion of substance A is 3 times the rate of effusion of substance B.
molar mass of substance A is 4.00g/mol
Ra = 3Rb
Ra/Rb = √Mb/√Ma
3Rb/Rb = √Mb/√4
3 = √Mb/2
√Mb = 6
Mb = 36
so, molar mass of substance B is 36g/mol.
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A student wants to determine the effect of a fertilizer on the growth of bean plants. She sets
up the following experiment.
Bean
Soil
Fertilizer
Daily water 50 mL
A
Bean
Soil
Daily water 50 mL
2. What does setup "B" represent and why is it important in this experiment?
ANSWER QUESTION 2 NOT QUESTION 1
The experimental set up in B is to observe the growth the green beans without the addition of fertilizer. Thus, we can compare the growth of the plant with and without fertilizer and thereby we can understand the effect the fertilizer on the plant growth.
What is fertilizer?Fertilizers are chemical substances used to nourish the plants by making the soil rich in nutrients and minerals. Plants needs minerals along with water such as potassium, calcium, phosphorous, nitrogen etc.
Sometimes the soil comes deficient of these minerals and we have to fertilize the soli by the addition of the chemicals containing these minerals. Hence, fertilizers provide a nutrient rich soil for plant growth.
The experimental set up with fertilizer added plant and the second one (B) without fertilizer helps to compare the growth in both conditions and we can clearly understand how fertilizers effect the growth of plants by comparing the plant growth in A and B.
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what is the simplest formula of a solid containing a, b, and c atoms in a cubic lattice in which a atoms occupy two corners and one body-center position, the b atoms occupy two corners, and the c atoms occupy four corners and two faces of the unit cell?
A solid with atoms a, b, and c arranged in a cubic lattice has the simplest formula possible: abc3.
Given that the unit cell's an atoms occupy two of its corners and one of its body centres, the b atoms occupy two corners, and the c atoms occupy four of its corners and two of its faces
There are eight corners, and each one has an atom in it.
Atomic number of a = 8 * 1/8 = 1
The centre b atom is the lone atom. So b = 1
Each of the six faces holds a c atom.
6 x 1/2 = 3 c atoms are present.
So when we combine them, we get the solid as abc3 formula.
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an ideal gas is brought through an isothermal compression process. the 5.00 mol of gas goes from an initial volume of 224.2 cm3 to 104.3 cm3 . if 1842 cal is released by the gas during this process, what is the temperature of the gas? [1 cal
an ideal gas is brought through an isothermal compression process. If 1842 J is released by the gas during this process, the temperature of the gas is 134.27 K
Isothermal compression is the thermodynamic method of decreasing volume or increasing pressure when the system temperature remains constant. Thermal equilibrium is maintained throughout the process.
When a gas is compressed isothermally, work is carried out on the system to reduce volume and increase pressure. Working on the gas increases its internal energy and tends to raise its temperature. To keep the temperature constant, energy must escape the system as heat and enter the environment.
According to the question, this is the case of isothermal reversible compression of gas.
As per the first law of thermodynamics,
where,
ΔU = internal energy
q = heat
w = work done
As we know, the term internal energy depends on the temperature and the process is isothermal which means at a constant temperature.
Thus, at a constant temperature, the internal energy is equal to zero.
q = -w
Thus, w = -q = 1842 J
The expression used for work done will be,
W = nRT ln(Vf/Vi)
where,
w = work done = - 1842 J
n = number of moles of gas = 5 mole
R = gas constant = 8.314 J/mole K
T = temperature of gas = ?
Vi = initial volume of gas
Vf = final volume of gas
Now put all the given values in the above formula, and we get the temperature of the gas.
- 1842J = 5 mole * 8.314J/mole K*T*ln (104.3 * 10−6 m3/224.2 * 10−6 m3)
T = 134.27
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The compound between Sulfur and Magnesium is _
Answer:
Magnesium sulfide
Explanation:
✔ Question 1
Below is a picture of the rock strata of a mountain.
What can you infer about the layers in this picture?
Sedimentary rock layers are referred to as rock strata.
What is a rock?A rock is a dense mass of mineral grains that have grown or been cemented together over time. There are big rocks and little rocks. Pebbles are little rocks.
The sediment grains that are deposited by water, wind, or ice become sedimentary rocks. They are always formed in layers and are referred to as "beds" or "strata," and frequently include fossils.
Weathering, erosion, deposition, compaction, and cementation are the processes that result in the formation of these horizontal layers. Newer layers are deposited and created during this process on top of older layers, allowing for the relative dating of each layer.
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calculate the concentrations of all species present in a 0.29 m solution of ethylammonium chloride (c2h5nh3cl).
The concentrations of all species present in a 0.29 m solution of ethylammonium chloride is 0.00000223
pKa for C2H5NH3+ = 10.7
pKw = 14.0
pKa + pKb = pKw
10.7 + pKb = 14.0
pKb = 14.0 - 10.7
pKb = 3.30
C2H5NH3Cl is a salt of ethylamine and HCl so it will dissolve in water to produce C2H5NH3^+ + Cl^-
The base hydrolysis reaction: C2H5NH3^+(aq) + H2O(l) <=> C2H5NH2(aq) + H3O^+(aq)
This reaction is described by Kb.
Kb = [C2H5NH2][H3O^+]/[C2H5NH3^+]
Let [C2H5NH2] = [H3O^+] = x,
so [C2H5NH3^+] = 0.29 - x
Kb = x^2/(0.29 - x) = 2.00 x 10^-11
Let's solve for x. In this equation, It is possible to solve without the use quadratic equation. So we can assume that 0.29 - x is approximately equal to 0.29. We won't know until we do the calculation.
We get: x^2 + 2.00 x 10^-11x - 4.99 x 10^-12 = 0
With the use of a quadratic calculator.
x = 2.23 x 10^-6 M = [C2H5NH2] = [H3O^+]
0.29- x is just 0.26 M in this problem because 2.23 x 10^-6 M is insignificant.
[C2H5NH3^+] = 0.29 M = [Cl^-]
NOTE:
pH = -log [H3O^+] = -log(2.23 x 10^-6) = 5.65
Ka is the acid dissociation constant
Kb is the base dissociation constant
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For 55.0seconds, Trevor was hang gliding at a constant velocity. In that time, he moved 583 meters to the southeast, and a flock of Canada geese flew past him at 17 meters per second. What was Trevor's velocity?
The velocity of Trevor, given that for 55.0 seconds, he moved 583 meters sountheast is 10.6 m/s
How do I determine the velocity of Trevor?Velocity is simply defined as the rate of change of displacement with time. Mathemathically, it is given as:
Velocity = displacement / time
With the above formula, we can obtain the velocity of Trevor as illustrated below::
Time = 55.0 secondsDisplacement = 583 meters southeastVelocity of Trevor =?Velocity = displacement / time
Velocity = 583 meters / 55.0 seconds
Velocity = 10.6 m/s
Thus, from the calculation made above, we can conclude that the velocity of Trevor is 10.6 m/s
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9. The Sun is powered by the fusion of hydrogen atoms into
helium atoms. When the Sun has exhausted its hydrogen sup-
ply, it could fuse helium-4, forming carbon-12. Write a
balanced nuclear equation for this process.
Answer: A balanced nuclear equation for the fusion of helium-4 to form carbon-12 would be:
He-4 + He-4 -> C-12 + energy
In this equation, two helium-4 atoms fuse to form a single carbon-12 atom and release energy. This process would occur in the core of the Sun once it has exhausted its supply of hydrogen and begins to fuse helium-4.
how many grams are 2.9 moles of x1y4z6 where x has an atomic mass of 189.5 y has an atomic mass of 197.6 z has an atomic mass of 115.7
The mass of 2.9 mol of the given compound is 4854.89 g.
What is a mole?A mole can be specified as a standard unit that is used to determine a given count of particles. A mole can be used to evaluate a huge number of quantities of atoms, or molecules.
Given, the atomic mass of the X = 189.5
The atomic mass of Y = 197.6
The atomic mass of Z = 115.7
The molecular formula of the compound is X₁Y₄Z₆.
The mass of one mole or molar mass = 189.5 + 4 (197.6) + 6(115.7) = 1674
Given, the number of moles of X₁Y₄Z₆ = 2.9 mol
The mass of 2.9 moles of X₁Y₄Z₆ = 2.9 × 1674 = 4854.89 g
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a 2.00g sample of limestone was dissolved in hydrochloric acid and all the calcium present in the sample was converted to ca2 (aq). excess ammonium oxalate solution, (nh4)2c2o4(aq), was added to the solution to precipitate the calcium ions as calcium oxalate, cac2o4(s). the precipitate was filtered, dried and weighed to a constant mass of 2.43g. determine the percentage by mass of calcium in the limestone sample.
In order to precipitate the calcium ions as calcium oxalate, a 2.00g sample of limestone was first dissolved in hydrochloric acid until all of the calcium was transformed to Ca²⁺ (aq). This was followed by the addition of excess ammonium oxalate solution, (NH₄)₂C₂O₄(aq). Filtered, dried, and weighed to a consistent mass of 2.43g. The percentage by mass of calcium in the limestone sample is 31.25%
The percentage by mass of calcium in the limestone can be calculate as follows:
Mass of precipitate that is calcium oxalate = 2.43 g
Moles of calcium oxalate = 2.00g /128 g/mol = 0.015625 moles
One mole of calcium atoms make up one mole of calcium oxalate.
so, 0.015625 moles calcium oxalate equal to 0.015625 moles calcium atoms
Mass of 0.015625 moles of calcium :
0.015625 mol × 40 g/mol = 0.625 g
Mass of sample of limestone = 2 g
Percentage of calcium in limestone:
(0.625 g/2 g) x 100 = 31.25%
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How is melting similar to freezing? How is it different?
Melting and freezing refer to the changes in state which occur when the solid and liquid states interchange. Melting occurs when a solid is heated and turns to a liquid and freezing occurs when a liquid is cooled and turns to a solid.
Answer:
Melting and freezing both require energy, however melting involves the speeding up of molecules, and freezing involves slowing them down
Explanation:
what mass of hbr is dissolved in 500 ml water of hcl solution if 25 ml of this solution is neutralized by 20ml water of 0.67 M NaOH
The mass of HCl dissolved in 500 ml water of HCl solution is equal to 9.78 g.
What is a neutralization reaction?A neutralization reaction can be defined as a reaction in which an acid and base react to produce salt and water.
When HCl reacts with NaOH, the resulting salt is sodium chloride and water.
HCl + NaOH → NaCl + H₂O
Given, the volume of NaOH solution = 20 ml
The concentration of NaOH = 0.67 M
The number of moles of NaOH = (20 /1000) ×0.67 = 0.0134
The number of moles of HCl = 0.0134 mol
The volume of HCl taken = 25 ml = 0.025 L
The concentration of HCl solution = 0.0134/0.025 = 0.536 M
The volume of HCl solution = 500 ml
The number of moles of HCl = 0.536 × 0.5 = 0.268 mol
The mass of HCl = 0.268 × 36.5 = 9.78 g
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The diagram shows changes of state between solid, liquid, and gas. The atoms of a substance gain energy during a change of state. Before the change, the atoms are close together and cannot slide past one another. After the change, the substance can fill its container.
A diagram has a triangle at center with gas on top, liquid on bottom right, solid on bottom left. An arrow from gas to liquid is labeled O, and an arrow from liquid to gas is labeled N. An arrow from solid to liquid is labeled P, and an arrow from liquid to solid is labeled Q. An arrow from solid to gas is labeled L, and an arrow from gas to solid is labeled M.
Which arrow represents the change of state described above?
The arrow that represents the change of state that has been described is L.
What are the states of matter?We know that there are three states of matter of matter and these are the solid, the liquid and the gas. We know that in the solid state, the particles that compose matter are all joined together and they are held in fixed positions and can not be able to slide past one another.
As such, we have been shown the diagram that shows the way that the energy is transferred between the states of matter in the image that is attached to this answer.
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Answer:
Its A
Explanation:
I got it right
An atom has 8 protons, 8 neutrons, and 10 electrons.
What is the mass of this atom?
16 is the mass of this atom.
The Oxygen (O) has an atomic number of 8 and has a mass number of 16. Upon accepting 2 electrons it becomes O2-. The mass number is defined as the sum of the number of protons and neutrons present in the molecule. So here for O2- it contains 8 protons,8 neutrons and 10 electrons.
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How many liters (L) of water need to be added to prepare 1000mL of 0.3M NaCl from a 5M NaCl stock solution?
The amount of water needed to be added to prepare the solution would be 0.94 liters.
Dilution problemWhen diluting solutions, the number of moles of solutes before dilution must be equal to the number of solutes after dilution. The only thing that changes are the volume and concentration.
Thus, the equation of dilution is:
[tex]m_1v_1[/tex] = [tex]m_2v_2[/tex]
Where
[tex]m_1[/tex] is molarity before dilution[tex]v_1[/tex] is volume before dilution[tex]m_2[/tex] is molarity after dilution[tex]v_2[/tex] is volume after dilutionIn this case:
[tex]m_1[/tex] = 5 M, [tex]m_2[/tex] = 0.3 M, and [tex]v_2[/tex] = 1000 mL
Substituting:
5[tex]v_1[/tex] = 0.3 x 1000
[tex]v_1[/tex] = 300/5
= 60 mL
This means that the volume of the stock solution to be taken is 60 mL. The amount of water to be added would then be:
1000 - 60 = 940 mL
940 mL = 0.94 L
In other words, the amount of water needed to be added to prepare 1000 mL of 0.3M NaCl from a 5 M NaCl stock solution is 0.94 L.
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what special equipment did niels bohr use to develop his atomic model?
Neil Bohr used the fluorescent screen and an alpha particle detector to study the structure of an atom.
What is an atom?
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
The atom as a whole is neutral and stable due to presence of oppositely charged particles.
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as an immediate precautionary measure, how far should you isolate the leak area in all directions? qzuilet
As an intermediate precautionary measure, I should isolate the leak area in all directions for 50 metres(150 feet).
These manuals advise a 150-foot initial isolation in all directions. Responders should always strive to position themselves uphill, upwind, and upstream of the incident when responding to a scene involving hazardous materials.
Small spills (less than 52.83 gallons, or 200 litres): 100 feet in all directions should be isolated first (30 m). then during the day, safeguard those who are downwind: 0.2 mi (0.2 km). then throughout the night, safeguard those who are downwind: 0.8 mi (1.2 km).
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PLEASE HELP IM GONNA FAIL THIS WHOLE YEAR PLEASE
Answer:
Mg+HCl = MgCl+H2
Explanation:
you just have to write the correct formula of these elemernt
g a student chose 1m acetic acid as the buffer solution to inhibit the ph change of an aqueous solution. if a strong acid is added to the solution, would this buffer solution inhibit the change of ph to the aqueous solution? explain.
If in 1 M acetic acid as the buffer solution to inhibit the pH change of an aqueous solution, if the strong acid is added to the buffer solution the pH decrease.
The buffer solution consist of both the acid and the base. the weak acid and the conjugate base or the weak base and the conjugate acid. if we added the strong acid then pH value of the solution will decreases, the expression is given as:
pH = pka + log [salt]/ [acid]
pH = 1 / [H⁺]
it is clear form the above equations that as the H⁺ ions concentration increases the pH value of the solution decreases. the pH value and the H⁺ ions concentration are inversely proportion to each other.
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uppose there are 5 chemists and 10 mathematicians in a room. a) how many ways can you select six people from the room?
The number of way to select people from a total of a people is a! /b!·(a-b)!
plugging in 15 for A and 6 for B
P= 15! / 6!(15-6)!
P= 1307674368000 / 720·9!
P= 1307674368000 / 362880
P= 360360
By choosing some items from a set and creating subsets, permutation and combination are two approaches to represent a group of objects. It outlines the numerous configurations for a particular set of data. Permutations are the selection of data or objects from a set, whereas combinations are the order in which they are represented. Both ideas are critical to mathematics.
Here, the differences between permutation and combination are described in detail. Here, we'll talk about both subjects with formulas, examples from everyday life, and questions that have been answered. Students can also work on the Permutation and Combination Worksheet to improve their understanding of this subject and learn shortcuts for answering additional questions.
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Cations are formed when neutral atoms lose neutrons positrons protons electrons
Cations are formed when neutral atoms lose electrons from the valence shell of an atom.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
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select true or false: the radii of ions are always smaller than the radii of the corresponding atoms of the same element.
The given statement about radii is false and the correct statement is only radii of cation are always smaller than radii of corresponding atoms of same elements.
Radii of anions are greater than its parent atoms due to the following reasons: 1. Size of anion is always greater than its parent atom because anions are formed due to gain of electrons. When electrons increases there are still same number of protons. The attractive force is thus reduced as there are same number of protons attraction increased number of electrons. This causes the electrons to not be bound as tightly to the nucleus resulting in an increase in size. 2. Size of cation is always smaller than its parent atom because as a particular atom looses electron, no of proton become more than no of electron and attraction forces increases. So radius decreases.
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how are windbelts formed Please answer ASP its 30 points!!
Answer:due to unequal heating
Explanation:
3 The density of wood is 0.5g/cm³. What is its value in S1 unit?
The value of the density of wood that is 0.5g/cm³ in SI units would be 500 [tex]kg/m^3[/tex].
What is an SI unit?The SI unit is an acronym for the international system of units. It is a system that guides measurements generally in science. It consists of 7 base units:
Time in secondsLength in metersMass in kilogramsElectric current in amperesTemperature in KelvinAmount of substance in moleLuminosity in candelaThus, for a density that is in g/cm³, the SI unit should be kg/m3.
0.5 g/cm³ = 0.5g/1 cm³
1 g = 0.0001 kg
0.5 g = 0.5/1000 = 0.0005 kg
1 cm³ = 1 x [tex]10^{-6[/tex] [tex]m^3[/tex]
Thus, 0.5 g/cm³ = 0.0005 kg/1 x [tex]10^{-6[/tex] [tex]m^3[/tex]
= 500 kg/m^3.
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• How does the weight on a bicycle affects the force required to affect its motion?
Answer:
More mass means more force is needed to achieve the same change in speed in the same amount of time. That force is transmitted from the road, to the tires, to the wheels, through the brakes, to the frame and rider.
The weight on a bicycle affects the force required to accelerate it as it increases inertia it will slow down its rate of acceleration.
What is Acceleration?
Acceleration is defined as the rate of change of velocity of an object with respect to time. These are vector quantities which have magnitude as well as direction.
The orientation of the acceleration of an object as given by the orientation of the net force acting on that object. It is expressed as:
[tex]\overline{a} = \frac{v - v_0}{t} = \frac{\Delta v}{\Delta t}\overline{a} = average acceleration\\v = final velocity\\v_0 = starting velocity\\t = elapsed time[/tex]
Acceleration is proportional to the force applied, so the greater the force, the greater the speed of the object in the direction of the force. Mass is inertia, which is the reluctance to accelerate, so for the same force, more massive objects experience smaller acceleration than less massive objects.
Thus, the weight on a bicycle affects the force required to accelerate it as it increases inertia it will slow down its rate of acceleration.
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After hockey practice, Carissa and Keenan were playing a game where they were pushing some objects to get them to crash. They were using a cone and two different pucks—a black one with more mass for Crash 1 and a blue one with less mass for Crash 2. They want to know what happened to the cone. Use the information from the diagram to answer. In which crash did the cone experience a stronger force? How do you know?
The crash where the cone experience a stronger force is option D because: Crash 1: the force on the black hockey puck was stronger in this crash, so the force on the cone was also stronger.
Does it take a stronger force to slow something down?The ball is drawn back to Earth by gravitational force. The ball returns to Earth as a result of friction. The ball is forced back toward Earth by magnetic force.
A puck's velocity changes when a player makes contact with it when it is still. He causes the puck to speed up, in other terms. The hockey stick's force, which causes the acceleration, is responsible. The velocity grows as long as this force is in motion.
Therefore, the force applied to an object must be larger than what is required for a progressive slowing down if the object must be slowed down quickly. For instance, a bicycle's brakes will slow or stop it more quickly the more force is given to it.
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See full question below
After hockey practice, Carissa and Keenan were playing a game where they were pushing some objects to get them to crash. They were using a cone and two different pucks—a black one with more mass for Crash 1 and a blue one with less mass for Crash 2. They want to know what happened to the cone.
Use the information from the diagram to answer.
In which crash did the cone experience a stronger force? How do you know?
answer choices
There was no force on the cone. In both crashes, only the hockey puck experienced a force.
The diagram doesn’t tell you anything about the force on the cone. It only gives information about the force on the pucks.
It was the same force in both crashes; the hockey puck changed speed by the same amount in each crash, so the force on the cone was the same each time.
Crash 1; the force on the black hockey puck was stronger in this crash, so the force on the cone was also stronger.
please help!
Are magnesium and calcium more reactive with oxygen in the air than is aluminum? Support your answer.
Magnesium and calcium are 2nd group elements with 2 valence electrons. They are metals in room temperature and easily lose these electrons to nonmetals such as oxygen.
What is magnesium ?Magnesium is 12th element in periodic table. It is 2nd group element and is a called alkaline earth metals. Its group members are calcium, strontium, and barium.
They contains 2 valence electrons which can be easily lost to a non-metal. Oxygen is highly electronegative element and it contains 6 valence electrons and need two more electrons to achieve octet.
Al is 13th group element it is not as much electropositive as alkaline earth metals. It contains 3 valence electrons and thus it need to lose all these 3 electrons to achieve octet. Hence, Al is less reactive towards O2 in comparison with Mg and Ca.
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