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Answer: 3
Explanation:
A solid is crushed into a powder is chimacal change or pysical change
Answer:
Physical Change
Explanation:
A solid being crushed into a powder is a physical change because a chemical change is when substances combine to create new substances.
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How are elements in the same family in the periodic table alike?
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The Correct choice is ~ C
They have the same number of electron shells~
Explanation:
option C is correct.....
How are sound and light similar? How are they different?
Answer:
Sound requires a medium to move through; light does not.
Sound and light are similar in that both are forms of energy that travel in waves.
Explanation:
Sound and light are similar in that both are forms of energy that travel in waves. They both have properties of wavelength, freqency and amplitude. Sound can only travel through a medium (substance) while light can travel through empty space. Sound is a form of mechanical energy caused by vibrations of matter.
Light waves DO NOT require a medium, they travel fastest in empty space; Sound waves REQUIRE a medium, they travel fastest in dense material like solids. Sound is a longitudinal wave.
Which of the following two combinations are correct?
Answer:
D
Explanation:
Copper has a more positive reduction potential than Hydrogen and is below Hydrogen in the reactivity series. So it can't displace H+ from diluted acids. Therefore Cu doesn't form Cu salt and a gas
Fe, Zn and Mg are above Hydrogen in the electrochemical series and can displace Hydrogen as follows
Fe(s) + 2HCl(aq) ----> FeCl2 +H2 (g)
Mg(s) + 2HCl(aq) ----> MgCl2 (aq) +H2 (g)
So iii is wrong
Zn(s) +2HCl(aq) ----> ZnCl2(aq) +H2 (g)
Someone plz help me asap
Answer: it would be the stem and the roots of the plant
Explanation:
Representa la formación del enlace entre las siguientes sustancias, calcula también la diferencia de electronegatividad:
a) La reacción entre el aluminio y el cloro.
b) La reacción entre el sodio y el fósforo
c) La reacción entre litio y el yodo.
d) La reacción entre el estroncio y el azufre.
A) La reacción entre el aluminio y el cloro.
Write a five-sentence paragraph describing the nature and background of basketball.
Answer:
The history of basketball began with its invention in 1891 in Springfield, Massachusetts by Canadian physical education instructor James Naismith as a less injury-prone sport than football. Naismith was a 31-year old graduate student when he created the indoor sport to keep athletes indoors during the winters.
Explanation:
The history of basketball began with its invention in 1891 in Springfield, Massachusetts by Canadian physical education instructor James Naismith as a less injury-prone sport than football. Naismith was a 31-year old graduate student when he created the indoor sport to keep athletes indoors during the winters.
Fill in the the correct term to complete the sentence provided. The ______ produces chemical changes to provide energy.
Answer:
chemical reaction
Explanation:
The chemical reaction produces chemical changes to provide energy. Chemical reactions often involve changes in energy due to the breaking and formation of bonds.
Explain how signals are processed and stored by the brain.
Answer:
this is the answer
Explanation:
Neurons communicate with each other by sending chemical and electrical signals. Each neuron is connected with other neurons across tiny junctions called “synapses”. Impulses rush along tiny fibres, like electrical wires, from one neuron to the next. Electrical impulses travel through neurons.
How many grams of oxygen will react with 2.0 grams of iron II sulfide?
Answer:
How many grams Iron(II) Sulfide in 1 mol? The answer is 87.91. We assume you are converting between grams Iron(II) Sulfide and mole. You can view more details on each measurement unit: molecular weight of Iron(II) Sulfide or mol The molecular formula for Iron(II) Sulfide is FeS. The SI base unit for amount of substance is the mole.
Explanation:
a solution of HCI contains 36 percent HCI,by mass and calculate the mole fraction of HCI in the solution?
Explanation:
You have a solution that contains 36 g HCl dissolved in 64 g water
Molar mass HCl = 36.45 g/mol
Mol HCl in 36 g = 36 g / 36.45 g/mol = 0.9876 mol
Molar mass H2O = 18 g/mol
Mol H2O in 64 g = 64 g / 18 g/mol = 3.5556 mol
Total mol = 0.9875 + 3.5556 = 4.5431 mol
Mol fraction HCl = 0.9876 mol / 4.5431 mol = 0.2174
Mol fraction H2O = 3.5556 / 4.5431 = 0.7826
The answer should have 2 significant digits:
Mol fraction HCl = 0.22
Mol fraction H2O = 0.78
Mol fraction has no units.
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How many moles of NO₂ would be required to produce 2.30 moles of HNO₃ in the presence of excess water in the following chemical reaction?
3 NO₂(g) + H₂O (l) → 2 HNO₃(g) + NO(g)
Answer:
Stoichiometric Calculation:
3 NO₂(g) + H₂O (l) → 2 HNO₃(g) + NO(g)
2 moles of HNO₃ is produced from 3 moles of NO₂.
Therefore, By unitary method:
2.30 moles of HNO₃ produced from the moles of NO₂ = [tex] \dfrac{3}{2} \times 2.30 = \bf{3.45 mol}[/tex]
The number of moles of NO₂ that would be required to produce 2.30 moles of HNO₃ in the presence of excess water in the chemical reaction is 3.45 moles
The balance equation is as follows:
3NO₂(g) + H₂O (l) → 2HNO₃(g) + NO(g)
Water molecules is in excess. Therefore, the limiting reagent is Dinitrogen oxide.
The limiting reagent will determine the amount of product produced.
Therefore,
2 moles of HNO₃ needs 3 moles of NO₂
2.30 moles of HNO₃ will need ? moles of NO₂
cross multiply
number of moles of NO₂ = 2.30 × 3 / 2
number of moles of NO₂ = 6.9 / 2
number of moles of NO₂ = 3.45 moles
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An electron is present at an energy level with an energy of 5.44 x 10−19 J. After a second, the electron is present at an energy level with energy, 2.4 x 10−19 J. What most likely happened during the transition?
A photon of energy 7.84 x 10−19 J was released.
A photon of energy 3.04 x 10−19 J was released.
A photon of energy 7.84 x 10−19 J was absorbed.
A photon of energy 3.04 x 10−19 J was absorbed.
Answer:
Explanation:
b
Read the following statement:
The amount of force acting on an object is equal to its mass times its acceleration.
Does the statement describe a scientific law?
No, because it is applicable to all cases in the natural world
Yes, because it is applicable to just a few cases in the natural world
No, because it describes the relationship between force and acceleration
Yes, because it describes how mass and acceleration affect force
Answer:
D
Explanation:
the acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of an object
Draw an example of a buffer in the body.
Explanation:
this is answer.
To what energy level do the electrons drop when visible light is produced?
Answer: The energy of the photon is the exact energy that is lost by the electron moving to its lower energy level. When the electron changes from n=3 or above to n=2, the photons emitted fall in the Visible Light region of the spectra
2. Why was sud production used to assess the effectiveness of the synthesized soaps?
Answer:
Soap is effective as a cleaning agent because it is amphiphilic; it is partly polar and partly nonpolar. ... The sodium ion of the soap is replaced by one of these new ions, and the resulting salt is no longer soluble.
Soap seems to be amphiphilic, or partially polar as well as partially nonpolar, it works well as a cleaning agent. Several of these newfound ions take the place of such soap's sodium ion, rendering the salt insoluble.
What is Soap?Long chain fatty acids are salts of sodium and potassium that have a cleaning effect in the water. referred as soap They should be used as cleaning agents to get rid of oil and filth from garments and skin. As an illustration, stearic, oleic, as well as palmitic acids are used to create sodium stearate, sodium oleate, respectively sodium palmitate.
What is cleaning agent?Cleaning agents, often known as hard-surface cleansers, are things that are used to get rid of debris from surfaces, such as dust, stains, foul odors, and clutter. Health, aesthetics, odor removal, and stopping the transfer of dirt and toxins to oneself or others will be among the goals of cleaning products.
Because soap can serve as an emulsifying agent, it would be a superior cleanser. An emulsifier has the ability to mix two immiscible liquids together.
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hello guyz who ever answers will get 100 pts
Answer:
hello,
Good morning have a good day
How many grams of sodium chloride are dissolved in 375 ml of a 0.90% saline solution?
Answer:
337.5 g NaCl
Explanation:
.90% saline solution = 90g saline (NaCl)/100mL water (H2O)
1. Use 375 mL to find mass
375 mL × (90 g NaCl/100 mL) = 337.5 g NaCl in 375 mL .9% saline solution
The amount of sodium chloride dissolved in 375 ml of a 0.90% saline solution is 337.5 g.
What is the concentration of the solution?The concentration can be calculated when we have the molecular formula and its molecular weight. The concentration of the solution is calculated as the weight of a solute divided by the volume of the solution.
The weight/volume percentage of the solution is determined in the following way.
W/v (%) = weight of the solute/Volume of the Solution ( in mL)
Given, the concentration of the saline solution = 0.90 %
0.90 % saline solution means 90 g of NaCl is dissolved in 100 ml of water.
Given, the volume of solution = 375 ml
100 ml of saline solution containing NaCl = 90 g
Then 375 ml of saline solution containing NaCl = 90 ×375/100 = 337.5 g
Therefore, the amount of NaCl is equal to 337.5 g.
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What does percent composition tell you about a molecule?
O A. It tells you how the elements are arranged in the molecule.
B. It tells you the ratio of elements in the molecular formula.
C. It gives you the total number of atoms in the molecule.
D. It tells you how much of a molecule is made up of each element.
SUBMIT
Answer:
B
Explanation:
percentage composition helps to determine the percentage of each element in a compound
What happens to iron in a bolt as the bolt rusts?
A. It undergoes a chemical change.
O B. It undergoes a physical change
O C. The mass of the atoms decrease
O D. It changes into a different element.
a
Answer:
it undergoes a chemical change
Compare and contrast thermal energy and heat
Explanation:
The difference between heat and thermal energy is that thermal energy is not in the process of being transferred; it is not in transit, but remains as part of the internal energy of the system; heat, on the other hand, is energy in transit, i.e. energy in the process of being transferred from a hotter system.
How many photons are produced in a laser pulse of 0.593 J at 671 nm?
Explanation:
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How large
would be needed to hold
a Container
of water
Answer:
Since water has a density of 1 gram per cubic centimeter, then the container would need to be 800 cubic centimeters. if this container were a perfect cube, then the length of the side of the container would be equal to the cube-root of 800, which is approximately 9.28 cm to a side, or 3.65 inches to aside.
Which of the above reactions is NOT an oxidation-reduction (redox) reaction?
A.First (blue)
B.Third (white)
C.Fourth (purple)
D.Fifth (pink)
E.Second (red)
Explanation:
I think third(white) isn't a redox reaction
What equipment is generally used to make lyophilized medications suitable for administering to the patient? a) Test tubes or sterile ampules b) Petri dishes and sterile droppers c) Sterile syringes or graduated cylinders d) Measuring cups and clean, warm water
Answer:
The answer is B
B = Petri dishes and sterile droppers
Explanation:
What is the molarity of Ca(NO3)2 in a solution resulting from mixing 150.0 mL of 0.200 M HNO3 with 150.0 mL of 0.0100 M Ca(OH)2
The molarity of the Ca(NO3)2 solution would be 0.005 M
First, let us look at the balanced equation of the reaction:
[tex]2HNO_3+Ca(OH)_2 ---> Ca(NO_3)_2+2H_2O[/tex]
The mole ratio of HNO3 to Ca(OH)2 is 2:1.
Mole of HNO3 = molarity x volume
= 0.2 x 150/1000
= 0.03 mole
Mole of Ca(OH)2 = 0.01 x 150/1000
= 0.0015
Thus, there is no limiting or excess reactant.
Also from the equation, mole ratio of Ca(OH)2 to Ca(NO3)2 is 1:1. Hence, the mole of Ca(NO3)2 would also be 0.0015 mole.
The total volume of the resulting solution would be: 150 +150 = 300 mL
Thus, the molarity of the resulting Ca(NO3)2 would be:
Molarity = mole/volume
= 0.0015/0.3
= 0.005 M
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When energy is conserved or transferred some energy becomes unavailable to do useful work what happened to the unavailable energy?
A) It is conducted
B) It is completely destroyed
C) It is given off as the
D) It is given off as microwaves
Answer:
The answer is C) It is given off as heat
Explanation:
Definition of unavailable energy : energy that cannot perform work while under the current conditions; see also available energy, energy deterioration, and entropy.
How may energy become scarce?Energy can transform from more useful forms into less useful forms, but it cannot be created or destroyed. It turns out that some energy gets transformed into an useless form in every real-world energy transfer or transformation.
Entropy is the measurement of the amount of thermal energy per unit of temperature in a system that cannot be used for productive work. Entropy is a measure of a system's molecular disorder or unpredictability since work is produced by organized molecular motion.
What is Mcq for McVisible Energy? Available energy is the largest portion of low-grade energy (heat) that is available for conversion. The smallest amount of heat that needs to be rejected is referred to as unavailable energy.
For the system with two heat reservoirs undergoing this irreversible heat transfer, entropy increases. We'll see that this implies that the ability to use the transferred energy for work has been lost. Energy is no longer available to perform work due to the increase in entropy.
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If an HPLC procedure is running at a pressure of 5.48×10^8 Pa what is it’s running pressure in torr