Answer:
A) Earth's atmosphere
B) initial thrust of take-off
C) angle of approach upon landing
D) gravitational potential energy
So it would be D. Gravitational potential energy As the shuttle prepares to return to Earth it reduces its speed so that gravity pulls it out of its orbit and toward Earth. As it approaches the earth the gravitational potential energy is converted to kinetic energy. The drag of Earth's atmosphere slows the shuttle's descent and causes some kinetic energy to convert to heat energy.
Explanation:
A couple of things, if the shuttle burned all of it's fuel before entering Earth's atmosphere then that means that the shuttle was accelerating towards Earth until it ran out of fuel. At that point, there is little to no air resistance (friction) by the lack of an atmosphere so it keeps accelerating due to Earth's gravitational force. The closer the shuttle gets to Earth the stronger the gravitational pull the shuttle experiences.
Note that, once the shuttle reaches Earth's atmosphere it will cause significant amount of friction and thus will cause the shuttle to slow down.
Answer:
The answer is D
Explanation:
Free points :D
Which formula can be used to calculate the theoretical yield?
Actual yield + percent yield
Amount of reactants + amount of products
(Actual yield ÷ percent yield) × 100
(Amount of reactant ÷ amount of product) × 100
Answer:
Option C, (Actual yield ÷ percent yield) × 100
Explanation:
Theoretical yield is defined as the total amount of product formed for given reactants in a chemical reaction. It is an ideal case which assumes no exceptions or wastage.
The mathematical relation between the actual yield, percent yield and theoretical yield is as follows -
[tex]P.Y. = \frac{M_{A.Y.}}{M_{T.Y.}} * 100[/tex]
Where
P.Y. represents the percent yield a
M A.Y. represents the mass obtained from actual yield
M T.Y. represents the mass obtained from theoretical yield
Hence, if we rearrange the formula, we get -
[tex]M_{T.Y.} = \frac{M_{A.Y.}}{P.Y.} * 100[/tex]
Hence, option C is correct
Answer:
C
Explanation:
Just took the test :)
Select the ion. HC 2H 3O 2, Mg, H +
Answer:
H+
Explanation:
H+ = hydronium ion
- Hope that helps! Please let me know if you need further explanation.
which compound has the stronger bonds
Answer:
Compound B would have stronger bonds because the reaction needs and absorbs heat to reach the status of the product.
Explanation:
LeAnn knows the speed of an airplane but she wants to find the velocity. What does she need to determine to find velocity?
A.
The time it takes the airplane to move between two points.
B. The acceleration needed to get to its speed.
C. The force of the airplane's engine.
D.
The direction the airplane is flying.
To determine the velocity the she need to know the time it takes the airplane to move between two points.
What is the difference between speed and velocity?Speed is a scalar quantity means it depends on magnitude value only and velocity is a vector quantity means with magnitute it also depends on the direction also.
Velocity is define as the distance travelled by any object in the given time interval and it is represented as:
v = dx/dt
Hence the time it takes the airplane to move between two points is required.
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Sort the images based on whether there’s a force of attraction or repulsion between the magnets shown.
Answer: Here is the answer
Explanation: Have a good day!
A substance or thing that creates a magnetic field is called a magnet. The sorting can be done as below in the image.
What is magnet?A substance or thing that creates a magnetic field is called a magnet. The most noteworthy characteristic of a magnet—a force that pulls against other ferromagnetic elements, such as metals like steel, iron, cobalt, and nickel, etc.—as well as the ability to attract or repel other magnets—is caused by this invisible magnetic field.
An object constructed of a substance that has been magnetised and produces its own continuous magnetic field is referred to as a permanent magnet. A common example comprises a refrigerator magnetism used to keep notes on the door of the refrigerator. Ferrimagnetic materials are those that can be magnetised and are also extremely drawn to a magnet. The sorting can be done as below in the image.
Therefore, the sorting can be done as below in the image.
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Which statement best describes comparative and descriptive investigations? They both include a question, procedure and conclusion. They both include a hypothesis. They both require a specified control group. They both use independent and dependent variables.Which statement best describes comparative and descriptive investigations? They both include a question, procedure and conclusion. They both include a hypothesis. They both require a specified control group. They both use independent and dependent variables.Which statement best describes comparative and descriptive investigations? They both include a question, procedure and conclusion. They both include a hypothesis. They both require a specified control group. They both use independent and dependent variables.Which statement best describes comparative and descriptive investigations? They both include a question, procedure and conclusion. They both include a hypothesis. They both require a specified control group. They both use independent and dependent variables.Which statement best describes comparative and descriptive investigations? They both include a question, procedure and conclusion. They both include a hypothesis. They both require a specified control group. They both use independent and dependent variables.Which statement best describes comparative and descriptive investigations? They both include a question, procedure and conclusion. They both include a hypothesis. They both require a specified control group. They both use independent and dependent variables.
Answer:
first one
Explanation:
For the reaction of nitrogen gas and hydrogen gas to make methane below, what stresses would shift the equilibrium to the left toward the reactants? N2(g) + 3 H2(g) ⇌ 2 NH3(g) + Energy
Answer:
1) Adding more NH₃
2) Raising the temperature of the reaction
Explanation:
To answer the question, we are to note that the reaction is a reversible reaction, hence to shift the equilibrium to the left we would alter the equilibrium conditions as follows;
1) Adding more of the product NH₃ to the reaction at equilibrium
Increasing the quantity of products will force the concentration of the reactant product combination at equilibrium to readjust forming more of the reactant, because, for example, at equilibrium we have one mole of N₂ combining with 3 moles of H₂ forming 2 moles of NH₃. If the NH₃ is increased to 4 moles then there will be more H₂ and N₂ formed to regain equilibrium
2) Increasing the reaction temperature
It is also observed that the reaction produces energy, that the the energy of the product is less than those of the reactant. Therefore, to shift the equilibrium to the left, that is towards the reactants, we have to increase the temperature of the reaction so that there will be enough energy for the formation of the higher energy reactants.
When we have stomach disorder, we take antacid to solve the problem. How does it help? Support your answer with an equation.
PLEASE ANYONE!
WILL MARK THE BRAINLIEST
Answer:
raises gastric pH; provides symptomatic relief.
Explanation:
Antacid: The term "antacid" is described as a specific substance that is responsible for neutralizing an individual's stomach acidity and therefore it is being used to relieve indigestion, heartburn, and an upset stomach, etc. These are considered as the absorbing as well as neutralizing agents to relieve indigestion that is being caused by excess "stomach acid". However, antacid generally consists of salts of sodium, magnesium, calcium, and magnesium. It works by raising the "gastric pH" and provides symptomatic relief from any sort of peptic ulcers.
The aqueous equilibrium reaction below would not be affected by
HNO, (H (ma) * NO, lagi
o the addition of NaNO
)
an increase in H concentration
o the addition of NaNDAL
a decrease in the HNO, concentration
Answer:
NDL
Explanation:
Which ion has the largest radius?
1) Br-
2) Cl-
3) F-
4) I-
In periodic table, down a group, the atomic or ionic radius increases. The ion which have largest radius in halogen group is I-.
What is ionic radius?Ionic radius is the distance from the nucleus to the valence shell of the ion called its ionic radius. Ionic radius increases down a group because down a group the number of orbitals or shells increases.
Halogens are 17th group elements in periodic table. They are highly electronegative and have valency of 1. Thus forms an X- ions by accepting an electron metals.
Among bromide, chloride, fluoride and iodide the biggest element is iodine with highest number of valence shell. Therefore, iodide ion or I- have largest radius than the other three ions.
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Among Br-, Cl-, F-, and I-, the iodide ion (I-) has the largest radius because it has additional electron shells and is placed further down the periodic table, which increases its size despite a higher nuclear charge.
Explanation:The ionic radius is a measure of the size of an ion in a crystal lattice. It is influenced by the ion's electron configuration and its nuclear charge. As we move down the periodic table, the ionic radii increase due to the addition of electron shells.
When comparing the ionic radii of Br-, Cl-, F-, and I-, we need to consider that these ions are isoelectronic, meaning they all have the same number of electrons, but different nuclear charges. The size of an ion is inversely proportional to the nuclear charge; the higher the charge, the greater the pull on the electrons and the smaller the ion. Since I- is furthest down the periodic table, it has more electron shells compared to Br-, Cl-, and F-, resulting in a larger radius despite its higher nuclear charge.
Therefore, among the options given, I- (iodide ion) has the largest radius because it belongs to the fifth period in the periodic table and has additional electron shells.
If this butane lighter uses 15.0 grams of butane, how many grams of carbon dioxide does it produce at 95% efficiency?
Answer: 43.5g of carbon dioxide it produce at 95% efficiency
Explanation:
[tex]2C_4H_{10}+13O_2\rightarrow 8CO_2+10H_2O[/tex]
To calculate the moles, we use the equation:
moles of butane =[tex]\frac{\text {given mass}}{\text {molar mass}}=\frac{15.0g}{58g/mol}=0.26moles[/tex]
According to stoichiometry:
2 moles of butane gives = 8 moles of carbon dioxide
Thus 0.26 moles of butane gives= [tex]\frac{8}{2}\times 0.26=1.04[/tex] moles of carbon dioxide
Mass of [tex]CO_2[/tex] produced=[tex]moles\times {\text {Molar mass}}=1.04\times 44=45.8g[/tex]
As yield of the reaction is 95%, the amount of [tex]CO_2[/tex] produced =[tex]\frac{95}{100}\times 45.8=43.5g[/tex]
Thus 43.5g of carbon dioxide it produce at 95% efficiency
PLZ RESPONDE QUICKLY MY EDUCATION IS ON THE LINE
What is the pressure, in KPa, of 2.00 mol of He in a 10.5 L container at 27.0 oC?
Answer:
N= PV/RT (temperature in kelvin); ( r is .0821 when pressure is in atm & r is 8.314 when pressure is in Kpa)
2.00 = P x 10.0/ .0821 x 300
after solving i got 4.926 atm
Explain why hotter air rises in the atmosphere
Hot air rises because when you heat air (or any other gas for that matter), it expands. When the air expands, it becomes less dense than the air around it. The less dense hot air then floats in the more dense cold air much like wood floats on water because wood is less dense than water.
2 Points
When light waves strike a blue object, what happens to the light waves of all
colors except blue?
O
O
A. They are diffracted.
B. They are polarized.
C. They are absorbed.
D. They are reflected.
SUBMIT
Answer:
All colors except blue are absorbed while blue is reflected. We
only see blue
Explanation:
When you go and see something blue as the sky, all of the colors are absorbed except blue. That is how we see colors
I need help assap!!!!!
Answer:
1. 2h(2) + 1O(2) -> H(2)O
2 1CH(4) + 2O(2) -> 1CO(2) + 2H(2)O
3. 1N(2) + 3H(2) -> 2NH(3)
4. 2P + 5O(2) -> 2P(2)O(5)
Which kind of investigations never include a hypothesis?
experimental
systemic
descriptive
comparative
Answer:
descriptive
Explanation:
Descriptive investigations only involve factual information. It doesn't answer questions for when, how, or why an event happens.
A piece of iron metal is heated to 155 degrees C and placed into a calorimeter that contains 50.0 mL of water at 18.7 degrees C. The temperature of the water rises to 26.4 degrees C. The specific heat of iron of iron is 0.444 J/g degrees C. Assuming no loss of heat to the surroundings, what is the mass of the iron?
A-26.2 g
B-28.3 g
C-29.2 g
D-28.2 g
Answer:
D = 28.2g
Explanation:
Initial temperature of metal (T1) = 155°C
Initial Temperature of calorimeter (T2) = 18.7°C
Final temperature of solution (T3) = 26.4°C
Specific heat capacity of water (C2) = 4.184J/g°C
Specific heat capacity of metal (C1) = 0.444J/g°C
Volume of water = 50.0mL
Assuming no heat loss
Heat energy lost by metal = heat energy gain by water + calorimeter
Heat energy (Q) = MC∇T
M = mass
C = specific heat capacity
∇T = change in temperature
Mass of metal = M1
Mass of water = M2
Density = mass / volume
Mass = density * volume
Density of water = 1g/mL
Mass(M2) = 1 * 50
Mass = 50g
Heat loss by the metal = heat gain by water + calorimeter
M1C1(T1 - T3) = M2C2(T3 - T2)
M1 * 0.444 * (155 - 26.4) = 50 * 4.184 * (26.4 - 18.7)
0.444M1 * 128.6 = 209.2 * 7.7
57.0984M1 = 1610.84
M1 = 1610.84 / 57.0984
M1 = 28.21g
The mass of the metal is 28.21g
Answer: 1610 j
Explanation:
On ck-12
If the [H₃O⁺] of a solution is 1.7 x 10⁻³ M, what is the pH of the solution?
Answer:
The pH of the solution is 2.77
Explanation:
Data obtained from the question include:
Concentration of hydronium ion, [H₃O⁺] = 1.7 x 10⁻³ M
pH =?
The pH is define as the measure of concentration of Hydrogen ion [H⁺] or hydronium [H₃O⁺] in an acid or a base. Mathematically, it is expressed as:
pH = –Log [H₃O⁺]
With the above equation, the pH can be obtained as follow:
pH = –Log [H₃O⁺]
[H₃O⁺] = 1.7 x 10⁻³ M
pH = –Log 1.7 x 10⁻³ M
pH = 2.77
Therefore, the pH of the solution is 2.77
Why do you think knowing enthalpy of reaction might be useful?
Answer:
It allows scientists to predict the temperature change during a reaction.
Explanation:
Answer:
It allows scientists to predict the temperature change during a reaction.
It allows scientists to determine how much of a reactant is necessary to produce a certain amount of energy.
It allows scientists to predict whether a reaction might produce dangerous amounts of heat.
Explanation:
Define the atomic mass unit and average atomic mass
Answer:
Atomic mass unit: a unit of mass used to express atomic and molecular weights, equal to one-twelfth of the mass of an atom of carbon-12. It is equal to approximately 1.66 x 10-27 kg
average atomic mass: The average atomic mass of an element is the sum of the masses of its isotopes, each multiplied by its natural abundance (the decimal associated with percent of atoms of that element that are of a given isotope).
Explanation:
Sociable weavers are a species of bird found in Africa. All males of a colony work together to build a large nest that can house several hundred birds. This is an example of .
Typically, peregrine falcons hunt medium-sized birds, but they will also eat small mammals, reptiles, and insects. This is an example of .
Male deer, called bucks, head-butt each other to defend their breeding territory and female mates. This is an example of .
Answer:
cooperation for the first, then predation, the last is competition.
Explanation:
i got it right. hope it helps!
Answer:
cooperation, predation, competition :)
Explanation:
A nuclide of Superscript 64 subscript 29 upper C u. absorbs a positron. Which is the resulting atom? Superscript 65 subscript 29 upper C u. Superscript 63 subscript 29 upper C u. Superscript 64 subscript 28 upper N i. Superscript 64 subscript 30 upper Z n.
The correct answer is option D) Superscript 64 subscript 30 upper Z n.
What is positron absorption?The energy of the two-electron masses is converted into electromagnetic radiation. This process, known as positron annihilation, is a characteristic means of identification of positron emission.
What can a positron penetrate?
A positron is the anti-particle of a beta particle and is emitted by a proton-rich nucleus. The collision of an electron and a positron yields two 0.511 MeV gamma rays. Positron gamma radiation can penetrate through inches of iron, concrete, wood, plastic, water, etc.
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2KOH+H2SO4=k2SO4+2H2O Is a balanced equation, displaying the combination of potassium hydroxide with sulfuric acid increase potassium sulfate and water. According to this chemical equation, how many moles of potassium hydroxide will be needed to make 4 moles of K2SO4?
Answer:
The number of moles of potassium hydroxide, KOH required to make 4 moles of K₂SO₄ is 8 moles of KOH
Explanation:
2KOH + H₂SO₄ → K₂SO₄ + 2H₂O
From the above reaction, we have 2 moles of KOH combining with 1 mole of H₂SO₄ to produce 1 mole of K₂SO₄ and 2 moles of H₂O.
Therefore the number of moles of potassium hydroxide that will be needed to make 4 moles of K₂SO₄ is;
8KOH + 4H₂SO₄ → 4K₂SO₄ + 8H₂O
8 moles of KOH is required to make 4 moles of K₂SO₄.
Final answer:
To make 4 moles of K2SO4, 8 moles of KOH are needed.
Explanation:
To find the number of moles of potassium hydroxide (KOH) needed to make 4 moles of K2SO4, we need to use the balanced chemical equation:
2KOH + H2SO4 → K2SO4 + 2H2O
From the equation, we can see that 2 moles of KOH react with 1 mole of H2SO4 to form 1 mole of K2SO4. Therefore, the mole ratio is 2:1.
Since we want to make 4 moles of K2SO4, we can set up the following proportion:
(2 moles KOH) / (1 mole H2SO4) = (x moles KOH) / (4 moles K2SO4)
Cross multiplying gives:
2 moles KOH = 4 moles K2SO4 * 2 moles KOH / 1 mole H2SO4 = 8 moles KOH
Therefore, 8 moles of KOH are needed to make 4 moles of K2SO4.
How is the mass of 1 mole of an element determined
According to the concept of Avogadro's number there are 6.023×10²³ elementary entities in an element which when multiplied by atomic mass gives the mass of 1 mole of an element.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number.
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What are some examples of forced convection
Answer: Using a fan on a hot summer day. Explanation: the sweat that our body produces is for effective heat transfer. ...
Radiators in fridges, acs and automobiles. ...
Instant water heating geysers or any other geysers.
Explanation:
Looking at the car in the picture above, explain how the electrons act to form this compound that is on the surface of the car, and what type of ions each element becomes. Remember the chemical formula for rust is Fe₂O₃.
(2-3 Complete Sentences)
Answer:
The correct answer is "Iron and oxygen act as Fe3+ and O2− ions respectively, forming rust (Fe₂O₃) in the presence of water by the formation of an ionic bond".
Explanation:
Rust is formed when iron reacts with oxygen in the presence of water (either if the iron is submerged or exposed to moisture in the air), forming the chemical compound Fe₂O₃. The presence of water is needed for rust formation because iron and oxygen act as ions when they are exposed to water, particularly Fe3+ and O2− ions respectively. The bond formed between these two elements are ionic bonds, because it is comprised of the reaction between a metal (iron) and a non-metal (oxygen).
A student has a solution of 2.0 M MgSO4. What volume (in mL) of the original solution is needed to make 100 mL of 0.40 M MgSO4?
A) 20
B) 50
C) 200
D) 500
What is the empirical formula for P4O10?
Answer: P2O5
Explanation: You divide both subscripts by 2 to get the empirical formula.
Answer:
Formula of P4O10 is P2O5.
Explanation:
WE GET IT BY DIVIDING BOTH SUBSCRIPTS BY 2.
1. What is the difference between an electric vehicle and those with a
combustion engine? *
Your answer
Answer:
Electric cars are much faster than their combustion counterparts.
Explanation:
This is because electric cars can produce high torque from the get go, whereas Combustion engines reach the torque after gaining speed
Based on the weather map, what might the upcoming weather be like in Chicago?
1.Warm, dry, clear skies
2.Warm, humid, possible thunderstorms
3.Cold, dry, clear skies
4.Cool, humid, possible thunderstorms
Answer:
Warm, dry, clear skies
Explanation:
The sun is responsible for all weather variations that take place. because the sun is a massive sphere of heated gases and has a very high temperature. It is the earth's primary source of heat and light. Here the weather is Warm, dry, clear skies. The correct option is 1.
What is weather?The weather of a location refers to the average conditions of the atmosphere there in relation to variables like humidity, temperature, wind speed, rainfall, etc. Cloudy, sunny, wet, stormy, or clear weather are all possible. It is a characteristic of the natural process that keeps the atmosphere in a state of equilibrium.
Meteorologists record the weather every day, and these records are kept for a very long time. These records are used to determine the weather's pattern. The climate of a place is defined as its long-term average weather pattern.
Severe weather is defined as weather that is extreme or intense enough to result in damage to property or fatalities.
Thus the correct option is 1.
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