Answer:
Scientists believe that comets are the debris left from the solar nebula which condensed to form the Sun and planets in our solar system. Most comets are thought to originate in a huge cloud called the Oort Cloud. ... Comets follow a regular orbit around the Sun.
Hope this helps! :)
Explanation:
Answer:
In fact, if the estimated total mass of all asteroids was gathered into a single object, this object would be less than 1,500 kilometers across, less than half the diameter of our Moon. Kirkwood gaps: If you plot the radius of the orbits of the asteroids you do not get a smooth `bell-curve' shape.
Explanation:
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.
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:
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:
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
Which of the following can’t be separated into simpler substances or converted into another substance by chemical processes? A. element B. compound C. solution D. suspension E. colloid
Answer:
THE ANSWER IS ELEMENT I hope i helped you
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).
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
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.
How many different elements are there in the formula AgNO3
Answer:
3 different elements
Explanation:
There are 3 different elements in silver nitrate (AgNO3). It also contains 5 atoms. Silver (1 atom), Nitrogen (1) and Oxygen (3). Nitrogen and Oxygen together to form an ion called nitrate (NO3). The ionic form of silver (Ag+) combines with Nitrate (NO3) to form silver nitrate (AgNO3).
Final answer:
Silver nitrate, or [tex]AgNO_3[/tex], consists of three different elements: silver (Ag), nitrogen (N), and oxygen (O). These elements combine uniquely, with one silver atom, one nitrogen atom, and three oxygen atoms, to form a compound that is commonly involved in ionic reactions in stoichiometry.
Explanation:
The formula [tex]AgNO_3[/tex] represents silver nitrate, which is a compound composed of three different elements. These elements are silver (Ag), nitrogen (N), and oxygen (O). In the formula, Ag represents a single atom of silver, N represents a single atom of nitrogen, and the subscript '3' after the letter O indicates that there are three atoms of oxygen involved in the compound.
When exploring chemical reactions involving silver nitrate, it's important to recognize its role in reaction stoichiometry and the resulting products. For example, when silver nitrate reacts with sodium carbonate ([tex]Na_{2}CO_3[/tex]), the resulting products are sodium nitrate and silver carbonate. This reaction can be written as: [tex]Na_{2}CO_3[/tex](aq) + [tex]2AgNO_3[/tex](aq) → [tex]2NaNO_3[/tex](aq) + [tex]Ag_{2}CO_{3[/tex](s), where 'aq' stands for aqueous solution and 's' for a solid. This illustrates the exchange of ions between the reactants to form the products, a common theme in chemical reactions involving ionic compounds like [tex]AgNO_{3[/tex].
Understanding the fundamentals of such reactions, including the role of each element and their combinations, significantly aids in comprehending overall chemical processes and the stoichiometry of reactions. In the case of [tex]AgNO_3[/tex], each formula unit contributes one silver ion ([tex]Ag+[/tex]), one nitrate ion ([tex]NO_3-[/tex]), and hence offers a gateway to analyzing various chemical equations where silver nitrate is involved.
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:
Which of the following is not radiation ? A. baking in a metal pan in the oven , B. heat from a fire , C. microwaving food , or D. suns rays
Answer:
A. because it is conduction the transfer of heat through touching solids. Microwaving is wrong because rays of heat warm up the food. Radiation is the transfer through rays/gases.
Explanation:
Baking in a metal pan and microwaving are not radiation.
What is Radiation?Radiation is a type of energy transfer that move in form of waves or particles or is transfer in form of wave. People are majorly exposed to radiation from cosmic rays, radioactive materials found in the soil, water, food, air and so on.
Therefore, Baking in a pan is not radiation because heat is transfer by conduction. to the solids.
Microwaving is not radiation because heat warm the food.
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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.
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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In which liquid does solid brass float?
A. Liquid mercury
B. Liquid brass
C. Water from The Dead Sea
D. Apple juice
This experiment is to see if water flows faster out of a smaller can or a larger can.
You will need:
• two cans (one quite small like a soup can and the other large, like a juice, can.)
Follow these steps:
A. Remove the top of each can. Punch a hole in the side of each can, very close to the bottom, making sure the holes are equal in size. Cover each hole with a piece of tape, and place the cans next to the sink.
B. Put water in both cans, making sure the water is at the same level - different amounts, but at the same level. Turn the cans so the holes are facing into the sink, and remove the tape at the same time.
Answer these questions: Do the streams of water shoot out at the same distance?
Why or why not?
Answer:
The streams of both cans shoot out at the same distance.
Explanation:
The water is coming out of the holes with the same pressure of the air in the can wanting to come out.
Both cans' streams shoot out at the same distance. Because the water is leaking from the holes at the same pressure that the air in the container is trying to escape.
Why do liquids put equal pressure on the container's wall at the same depth?At the same depth, liquids exert identical pressure on the container's wall.This is due to the fact that the liquid density at the same depth will be the same.Learn more about liquid pressure here:-
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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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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
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.
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:
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
Astronaut Mark Kelly and his crew traveled to the International Space Station in the space shuttle. The shuttle burned off all remaining fuel before entering Earth's atmosphere. When the shuttle returned to Earth it landed at a speed of approximately 354 km/hr or 220 mi/hr, about 20 times the landing speed of a commercial aircraft. What accounts for the shuttle's speed upon landing?
A)
Earth's atmosphere
B)
initial thrust of take-off
C)
angle of approach upon landing
D)
gravitational potential energy
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
Earth rotates once every 24 hours. What does this mean?
A.
Earth makes one full trip around the Moon every 24 hours.
B.
Earth completes a full spin on its axis once every 24 hours.
C.
Earth makes one full trip around the Sun every 24 hours.
D.
Earth changes its orbit from clockwise to counterclockwise every 24 hours.
Answer: B
Earth completes a full spin on its axis once every 24 hours.
Explanation:
HELP ASAP
A gas has experienced a small increase in volume but has maintained the same pressure and number of moles. According to the ideal gas law, how has the temperature of the gas changed? It has increased two times. It has increased slightly. It has decreased slightly. It has stayed the same.
Answer:
Imagine filling a rigid container attached to a pressure gauge with gas and then sealing the container so that no gas may escape. If the container is cooled, the gas inside likewise gets colder and its pressure is observed to decrease. Since the container is rigid and tightly sealed, both the volume and number of moles of gas remain constant. If we heat the sphere, the gas inside gets hotter and the pressure increases. This relationship between temperature and pressure is observed for any sample of gas confined to a constant volume. An example of experimental pressure-temperature data is shown for a sample of air under these conditions in Figure 3. We find that temperature and pressure are linearly related, and if the temperature is on the kelvin scale, then P and T are directly proportional (again, when volume and moles of gas are held constant); if the temperature on the kelvin scale increases by a certain factor, the gas pressure increases by the same factor.
In most usual conditions (for instance at standard temperature and pressure), most real gases behave qualitatively like an ideal gas. Many gases such as nitrogen, oxygen, hydrogen, noble gases, and some heavier gases like carbon dioxide can be treated like ideal gases within reasonable tolerances.
According to the ideal gas law, the temperature has increased slightly. Hence option b is correct.
What is ideal gas law?Ideal gas law is defined as the sum of the absolute temperature of the gas and the universal gas constant is equal to the product of the pressure and volume of one gram of an ideal gas. For low temperature, high density, and extremely high pressures, ideal gas law is inapplicable since molecular size and intermolecular forces are important non these circumstances. For heavy gases and gases with significant intermolecular forces, the ideal gas law does not apply.
The number of particles is proportional to the volume at constant temperature and pressure. Raising the average force that each particle applies to the surface is another method for maintaining pressure as the volume expands. When the temperature rises, this occurs.
Thus, according to the ideal gas law, the temperature has increased slightly. Hence option b is correct.
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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:
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
PLEASE HELP!!!!!
Use the reaction shown of solid iron and water forming solid iron oxide and hydrogen gas to calculate the mass of solid iron that must be used to
obtain 0.500 L of hydrogen gas at STP. 3Fe(s) + 4H20(l)-> Fe3O4(s) + 4H2(g) *
a. 1.50 g
b. 1.66 g
c. 1.24g
d. 0.935 g
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
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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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.