Answer:
O2 and O3 are allotropes of Oxygen, therefore they have (4) different chemical and physical properties.
Explanation:
HELLLPPP!
Interval Training means:
A)Incorporating a variety of exercises into your workout routine
B)Alternating short bursts of intense activity with active recovery
C)Strength training alternated with cardio exercises
D)Exercising for 10 minute periods multiple times a day
C)Strength training alternated with cardio exercises
Explanation:
Interval training is a type of training that involves a series of high intensity workouts interspersed with rest or relief periods. The high-intensity periods are typically at or close to anaerobic exercise, while the recovery periods involve activity of lower intensity.
Explain why mixtures are examples of a physical change. Why aren’t they a chemical change? What separates a physical change from a chemical change?
Help Pleaseee!!
Answer:
This is a physical change because it's not permanent and no chemical reaction occurs. Mixtures - Mixing together materials where one is not soluble in the other is a physical change. Note the properties of a mixture may be different from its components.
Explanation:
The difference between a physical reaction and a chemical reaction is composition. In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition.
In a physical change, the molecules are rearranged while their actual composition remains same. In a chemical change, the molecular composition of a substance completely changes and a new substance is formed. Some example of physical change are freezing of water, melting of wax, boiling of water....
Which of the following is true about Earth's supplies of freshwater?
a. Most liquid freshwater is stored in rivers and lakes.
b. Groundwater is a significant reservoir of liquid freshwater.
c. Liquid freshwater is about half of all the water on Earth.
d. None of the above.
Answer:
b
Explanation:
Groundwater is a significant reservoir of liquid freshwater is true about Earth supplies of ground water.
What is Fresh water?Freshwater refer to maturally occurring wateror frozen water containing that is supplied by the Earth which has low concentrations of dissolved salts and other total dissolved solids.
Freshwater is normally supplied by the Earth.
Therefore, Groundwater is a significant reservoir of liquid freshwater is true about Earth supplies of ground water.
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A neighbour says that she is going to get rid of a large pile of combustible rubbish by burning it. Describe whether the rubbish has really disappeared after burning. Explain any scientific principle that supports your answer.
Answer:
yes, the trash did disappear when she burned it however it releases smoke into the air (and harmful chemicals)
Explanation:
burning trash doesn’t only allow the waste to go down, it will also produce heat and electricity-while producing less greenhouse gas pollution than burning fossil fuels. However trash fires in burning barrels can smolder and, as a result, produce more harmful chemicals in smoke. Harmful contaminants can also be found in dirt. in conclusion, yes trash does disappear when burned but realeases many harmful chemicals.
hope this helped!
Energy 1:Question 8
What is a difference between a 90°C cup of water and a 40°C cup of
water?
Please hurry!!!
Answer:
50 C?
Explanation:
90 - 40 = 50 So 50 degrees celsius is your answer
Answer: pretty sure its C
Explanation:
Which mammal below lays tough leathery eggs? A) bear (placental) B) duck-billed platypus (monotreme) C) kangaroo (marsupial) D) bat (placental)
Answer:
the answer to your question is B) Monotreme.
Explanation:
most mammals do not lay eggs, they give birth. But, monotreme mammals including the duck-billed platypus do in fact lay shelled eggs.
What is the difference between a strong base and a weak base?
O A. A strong base is always more concentrated than a weak base.
B. A strong base produces more ions in solution than a weak base.
O C. A strong base has a lower Ky than a weak base.
O D. A strong base is not as conductive as a weak base
Answer: the answer is B!
Explanation: took the quiz
Bases produce salts by reacting with acidic solutions. The strong base releases more ions in the aqueous solution compared to the weak base. Thus, option B is correct.
What are a strong base and a weak base?Strong bases are substances that dissociate completely in the solution to produce hydroxide ions. They are completely ionizable and yield more ions than weak bases. The relative basic strength depends on the formation of the ions.
On the other hand, the weak bases are not capable of dissociating completely and rather partially dissociate to produce hydroxide ions. They yield less number of ions and have relatively less strength.
Sodium hydroxide, potassium hydroxide, cesium hydroxide, etc, are strong bases while, ammonium hydroxide, ammonia, aluminum hydroxide, etc., are weak bases.
Therefore, the strong and weak bases differ on dissociation.
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What are all the ways that a substance can change phase?
Answer:
There is 6 ways substance can change phase. They are melting, freezing, evaporating, condensing, sublimination, and deposition.
Hope this helped
Explanation:
How many liters of H2 at STP are required to react with 2.3 g of Fe3O4 to give FeO and H2O?
Answer:
0.22L of H2
Explanation:
We'll begin by writing the balanced equation for the reaction. This is given below:
Fe3O4 + H2 —> 3FeO + H2O
Next, we shall determine the number of mole present in 2.3g of Fe3O4. This is illustrated below:
Molar mass of Fe3O4 = (56x3) + (16x4) = 232g/mol
Mass of Fe3O4 = 2.3g
Mole of Fe3O4 =..?
Mole = Mass/Molar Mass
Mole of Fe3O4 = 2.3/232 = 9.91x10^-3 mole.
Next, we shall determine the number of mole H2 needed for the reaction. This is illustrated below :
From the balanced equation above,
1 mole of Fe3O4 reacted with 1 mole of H2.
Therefore, 9.91x10^-3 mole of Fe2O3 will also react with 9.91x10^-3 mole of H2.
Finally, we can obtain the volume of H2 required for the reaction as follow:
1 mole of a gas occupy 22.4L at stp.
Therefore, 9.91x10^-3 mole of H2 will occupy = 9.91x10^-3 x 22.4 = 0.22L
Therefore, 0.22L of H2 is required for the reaction.
A solution has [OH-] of 1x10^-2, what is the pOH of this solution
Answer:
The answer is: [D]: "12" .
Explanation:
i just did it
If the needle deflects East, what would happen if you reversed the current?
Answer:
the north and south poles will exchange places.
Explanation:
The intensity of the magnetic field produced around the conductor depends on the volume of current. Unless the position of the current is inverted, the compass needle travels in the same position, since the polarity of the magnetic field is inverted.
hope I helped!
Please Help!
Look at the electron-dot diagram for neon in the table above. Based on the table, explain why does neon have a very high ionization energy? Please use at least ONE complete content related sentence.
Answer:
Cause the electron-dot diagram for neon is the highest: 18
Explanation:
Aluminium would have similar properties to which of the following chemical elements?
Germanium
Gallium
Iron
Copper
Answer:
Gallium
Explanation:
Elements found in the same group of the periodic table, possess similar chemical properties. Aluminium and Gallium are found in Group 13 of the periodic table,hence, have similar properties.
What is the boiling point of
gold
1064.43°C
2970°C
1313°C
3266°C
Answer:
The melting point of Gold is 1064.43 degrees celsius and the boiling point is 2807 degrees celsius.
Answer:
2970 C
Explanation:
It melts at 5387 F and 2970 C
If black fur is dominant in rabbits, is it ever possible for two black fur rabbits to produce a white fur offspring?
Answer:
No
Explanation:
It is not possible because the Black fur is the dominant gene and White fur is not therefor if both rabbits have black fur it is impossible for the offspring of the rabbits to have white fur.
Help please!
Balance the following skeleton equation as illustrated below.
Answer:
The answer is H2(g) + Cl2(g) → 2HCl(g).
When wood is burned is this a physical or chemical change ?
Answer:
physical
Explanation:
no chemical reaction is occurring
The force between two objects, each of charge -Q is measured as +F when the objects are separated a distance 2d apart. If the charge on only one object is tripled, determine the new force between them:
Answer:
Fnew = k (-3Q *(-Q)) / (2d)²
Fnew = k * 3Q² /4d²
Explanation:
This is Coulomb's law
F = k (q₁*q₂)/r²
F - electric force
k - Coulomb constant
q₁, q₂ - charges
r - distance of charges
Starting situation : q₁ = -Q, q₂= -Q , r =2d
F = k (-Q*(-Q)) / (2d)²
F = k *Q² /4d²
NEW FORCE : q₁ = -3Q, q₂= -Q, r =2d
Fnew = k (-3Q *(-Q)) / (2d)²
Fnew = k * 3Q² /4d²
Which of the following phase changes occur at point B on the phase diagram shown below?
A) boiling
B) melting
C)sublimation
D) condensation
Answer:
C. sublimation
Option C is correct answer
All of the given phase changes occur at point B on the phase diagram shown in question because point B is the triplet point.
What is triplet point?The point at which all three phases meet and exist in the phase diagram is called Triplet point. So all six phase changes occur at that point like sublimation, boiling, melting, condensation, deposition and freezing.
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Iron nails are often coated with paint or zinc to reduce rusting. Iron usually rust when getting in contact with which of the following?
CO2
H2
N2
O2
Iron rusts due to oxidation, which is basically just iron reacting with oxygen to produce iron oxide, which is called rust.
how many atoms of potassium and how
many atoms of oxygen must be present in the
compound's formula?
The bus company that your school uses is thinking about changing the material that
makes their current fleet of buses because the buses are running into problems with
corrosion, the reaction of metals with oxygen present in air to form metal oxides that
are not structurally sound and are visually unappealing. In addition, the current
construction material is difficult to shape and is not visually attractive. The bus
company has asked your teacher to recommend an alternative material that could be
used to manufacture the next round of buses needed for your school and other schools
in the district. In addition to meeting certain chemical and physical requirements, the
material recommended must also be affordable.
Answer:
):
Explanation:
Which is the anode and which is the cathode?
2H+ + 2e- ➖> H2 (g)
2I- ➖> I2 + 2e-
Answer:
2l- ---> l2 + 2e- is the anode
2H+ + 2e- ---> H2(g) is the cathode
Explanation:
Oxidation occurs when a metal loses two or more electrons in a redox chemical reaction and reduction is when it gains. Thus, oxidation is the anode and reduction is the cathode.
Which is the anode (oxidation) and cathode (reduction)?
2H+ + 2e- --> H2(g)
2Cl- --> Cl2(g) + 2e-
Answer:
2H+ + 2e - ---> H2(g) is the cathode
2Cl - ---> Cl2(g) + 2e - is the anode
Explanation:
Hydrogen ion has gained two electrons, making it undergo reduction. While chlorine has lose two electrons, hence undergoing oxidation.
which has a higher boiling point? please help!
How is the Bohr atomic model different from the plum-pudding model?
A. In Bohr's model, the atom's mass is found at its center instead of
distributed throughout.
B. In Bohr's model, the atom's mass is mostly made up of electrons
instead of protons.
C. In Bohr's model, the volume of the atom is mostly made up of the
nucleus.
D. In Bohr's model, the atom consists of positive charges circling a
negatively charged nucleus.
Answer:
A. In Bohr's model, the atom's mass is found at its center instead of distributed throughout.
Explanation:
The Plum-Pudding model of an atom was proposed by the late J.J Thompson. In this model, an atom is seen as negative charged particles that are surrounded by a soup of positive charge, which was liken to Plum Pudding, an English dessert.
While in Bohr's model of an atom; negatively charged electrons move in clearly defined circular orbits around the atom's mass (positively charged), called Nucleus.
The Bohr's model has been consisted of the central atom's mass. Thus option A is correct.
Atom has been smallest particle of matter has been consisted of electrons, protons, and neutrons as the subatomic particle. The structure of atom has been postulated with different theories and model.
Thomson's Plum Pudding Model has been the first model for elucidating the structure of the atom.
According to Thomson, the atom has been consisted of central positive nucleus with electrons present outside the nucleus in the distributed model. The structure has been similar to English dessert Plum and has been named as Plum pudding model.
The Bohr's atomic model has been the most accepted with the nucleus has been a small entity in the atom. The electrons have been supposed to be present in the atomic orbitals, and revolves around the nucleus. The model resembles solar system.
The Bohr's model has been different from the Plum pudding model as in Bohr's model, atoms have been consisted within the orbitals consisting of negative charged electrons and are revolving around the positive nucleus.
The atomic mass of the atom has been consisted in the central nucleus. Thus, option D is correct.
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Place the atomic theories in the order in which they were published.
Answer:
Solid sphere model.Plum pudding model.Nuclear model.Planetary model.Quantum model.Explanation:
John Dalton proposed, the solid sphere model, he stated that atoms were indivisible and that every atom of a certain element had specific characteristics.J.J Thomson proposed, the plum pudding model, he stated that atoms were made of electrons that floated around a positively charged cloud.Ernest Rutherford proposed, the nuclear model, he stated that the atom was made of a central positive charge that was surrounded by electrons, it was not a cloud or sphere of positive energy, this, was concentrated in the nucleus and space where the electrons were was empty space.Niels Bohr proposed, the planetary model, he stated that electrons were around the positive nucleus but in orbits with different levels of energy.Lastly, Erwin Schrödinger proposed, the quantum model, this states that electrons move around a positive nucleus, but in waves, they are dispersed around the nucleus in orbitals.Please help me with all 3! Thank You!!
What would happen to a weak acid dissociation equilibrium if more reactants
were added
A. The concentration of reactants would increase.
B. Equilibrium concentrations would not change.
C. The concentration of products would increase.
D. The equilibrium constant would change.
K is unchanged. The equilibrium constant wouldn't change. it is based on le chateliers principle.
Equilibrium concentrations would not change. Hence, option B is correct.
What is chemical equilibrium?Chemical equilibrium is a reversible chemical reaction in which no net change in the amounts of reactants and products occurs.
Step-by-step explanation:
The general equation for the dissociation of a weak base is
B + H₂O ⇌ BH⁺ + OH⁻
According to the principle, when stress is applied to a system at equilibrium, the system will respond in a way that tends to relieve the stress.
If you apply stress by adding more BH⁺ or OH⁻, the system will respond by moving in a direction that gets rid of the added ions.
The position of equilibrium will shift to the left, forming more of the undissociated base.
Hence, equilibrium concentrations would not change.
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Relate dark matter to the development of the universe after the Big Bang. In 3-5 sentences, speculate on how the development of the universe would have been different if there had been no dark matter. In your answer, use the term structures.
Please answer
Answer:
Dark matter makes up 85% of the mass of the universe. Dark matter is not directly observable because it doesn't interact with any electromagnetic wave. In the development of the universe, without dark matter, the universe will not function, move or rotate as it does now (this speculation led to the quest to find the anomaly of mass and energy in the known universe, eventually leading to the idealization of dark matter) and will not have enough gravitational force to hold it together. After the big bang, the presence of dark matter and energy ensured that the newly formed universe didn't just float away, rather, it provided enough gravitational force to hold the universe while still allowing it to expand sufficiently.
The development of the universe would have been different without the universe in the sense that the young universe won't have enough mass to hold it together, and the universe would have simply floated apart. The behavior of the universe would have been different from what we observe now, and some physical laws that applies now will not apply to the universe.
Without dark matter, the universe will neither move, rotate, or be able to function.
It should be noted that dark matter makes up about 85% of the mass of the universe. Dark matter does not interact with an electromagnetic wave.
Without dark matter, the universe will neither move, rotate, or be able to function. After the big bang, the dark matter was vital in providing the gravitational force to hold the universe.
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