Answer:
electrical to sound
Explanation:
The total energy of a system remains constant always. In case of a phone, the battery of phone has chemical items. The chemical energy of the battery gets converted to the electrical energy into the phone. As a result, the electrical energy gets converted to sound energy.
Hence, the correct option is (C) "electrical to sound energy".
use the particle theory to explain why hot chocolate powder dissolves more rapidly in hot water than cold water
Answer:
2) To dissolve, solvent particles must come in contact with solvent particles. Particles of hot water are moving much more rapidly than particles of cold water. Hence, in hot water more water particles will come in contact with hot chocolate powder than in cold water, resulting in faster dissolving.
Explanation:
What information does a phase diagram give? A. The effect of temperature on volume changes of substances B. The effect of temperature and pressure on the phase of a substance C. The effect of concentration on the freezing point of a solution D. The effect of oxidation number on the melting point of a metal
The phase diagram has been the graphical representation of the change in the phase of the substance over pressure and temperature range.
What is a phase?The phase can be defined as the state of the substance at specified temperature and pressure.
The change in the temperature and pressure conditions resulted in the change in the state of the matter, and the changing points are termed as critical temperature and pressure.
Thus, the phase diagram has been the representation of the effect of temperature and pressure on the phase of the substance. Thus, option B is correct.
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The six kingdom system was designed
to account for great variation in the
kingdom that contained the
Answer:
prokaryotes
I got it right
What kind of energy is thermal energy?
A. Potential energy
B. Kinetic energy
C. Chemical energy
D. Atomic energy
Answer:
B. Kinetic energyExplanation:
According to research :
Thermal energy comes from a substance whose molecules and atoms are vibrating faster due to a rise in temperature. Heat energy is another name for thermal energy. Kinetic energy is the energy of a moving object. As thermal energy comes from moving particles, it is a form of kinetic energy.
An oil tanker spills a large amount of oil near the ocean shoreline. Which application of chemistry would best solve this problem?
Which of the following can be mixed in solution with NH2 to make a buffer?
A. NH4Cl
B. NaOH
C. HNO3
D. NaCl
Answer:
B
Explanation:
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Answer:
The answer is option A
NH4Cl
Hope this helps.
The quantum number that determines the orientation of orbitals in space relative to other orbitals is called
the
Answer:
Magnetic Quantum Number
Explanation:
The quantum number that determines the orientation of orbitals in space relative to other orbitals is called the Magnetic Quantum No.
Answer:
Magnetic Quantum Number
Explanation:
What forces hold network solids together?
A. Hydrogen bonds
O B. Covalent bonds
O C. Metallic bonds
D. Ionic bonds
Which element is most likely to gain an electron?
hydrogen
1
Answer:
F
Explanation:
Fluorine has the highest EN value. so F can receive electron the most when compare to other elements.
What distinguishes a substance from a mixture? Mixtures can be separated physically, while compounds cannot. Samples of the same substance can have different intensive properties. Substances are compounds, and mixtures are not. Mixtures are groupings of elements, and compounds are not.
Answer Mixtures are physically combined structures that can be separated into their original components. A chemical substance is composed of one type of atom or molecule. A mixture is composed of different types of atoms or molecules that are not chemically bonded.
What type of bonding around a central atom would result in a trigonal planar
molecule?
Answer: Three groups bound to it with no lone pairs
i think...
Which of the following reactions is not an example of an oxidation-reduction reaction? (2 points) Select one: a. 3Br2 + 2Ga yields 2GaBr3 b. H2S + Cl2yields 2HCl + S c. 2PbS + 3O2yields 2PbO + 2SO2 d. K2Cr2O7 + KOH yields 2 K2CrO4 + H2O
Answer:
The correct answer is : d) K₂Cr₂O₇ + KOH ⇒ 2 K₂CrO₄ + H₂O
Explanation:
An oxidation-reduction reaction (redox reaction) is the one in which the number of oxidation of the atoms change, and electrons are shared.
Oxidation: the atom loses electrons and its oxidation number is increased.
Reduction: the atom gains electrons and its oxidation number is decreased.
In the following reactions, the atoms which loses or gains electrons are:
a) 3Br₂ + 2Ga ⇒ 2GaBr₃
Br: its oxidation number changes from 0 to -1 (reduction)
Ga: its oxidation number changes from 0 to +3 (oxidation)
IT IS A REDOX REACTION.
b) H₂S + Cl₂ ⇒ 2HCl + S
Cl: its oxidation number changes from 0 to -1 (reduction)
S: its oxidation number changes from -2 to 0 (oxidation)
IT IS A REDOX REACTION
c) 2PbS + 3O₂ ⇒ 2PbO + 2SO₂
O: its oxidation number changes from 0 to -2 (reduction)
S: its oxidation number changes from -2 to +4 (oxidation)
IT IS A REDOX REACTION
d) K₂Cr₂O₇ + KOH ⇒ 2 K₂CrO₄ + H₂O
There are not changes in oxidation numbers of the atoms:
K : +1
Cr: +6
H: +1
O: -2
IT IS NOT A REDOX REACTION.
Which of the following research questions would be the most appropriate selection for a student studying space exploration?
A. Should we stop funding NASA?
B. What potential resources could be gained from the rise of asteroid mining?
C. Have we been visited by aliens?
D. Is space travel the future of human kind?
During a titration, 40.0 ml of 0.25M NaOH were required to neutralize 50.0ml of HCl. What's the concentration of the HCl solution? Question 6 options: A) 0.40M B) 0.10M C) 0.20M D) 0.25M
Answer:
C)
Explanation:
M1V1 = M2V2
40.0ml*0.25M = M2*50.0ml
M2 = 40.0*0.25/50.0 = 0.20 M
Why does reducing solute particle size increase the speed at which the solute dissolves in water? A. It exposes more of the solute to the water molecules. B. It makes the temperature of the water significantly higher. C. It raises the pressure of the water molecules on the solute. D. It makes the water molecules move around faster.
Answer:A
Explanation:For a given amount of solute, smaller particles have greater surface area. With greater surface area, there can be more contact between particles of solute and solvent.
Answer:
A. It exposes more of the solute to the water molecules.
Explanation:
Energy is involved in some way in all chemical reactions. Which type of reaction involves the absorption of energy from the surroundings? Options: exothermic reactions endothermic reactions
Answer:
endothermic reaction
Explantion:
The definition for endothermic is:
describing a process that involves the absorption of energy from the surroundings by substances undergoing change.
Think of en-dothermic as energy entering and ex-othermic as energy exiting.
Answer:
Endothermic
Explanation:
On Edge :)
When adding the measurements 42.1014 g + 190.5 g, the answer has ___ significant figures.
Answer: The answer has 7 significant figures
Explanation:
The addition of 190.5 and 42.1014 will give 232.6014. Counting the digits will give 7 significant figures.
For the equilibrium system described by this equation, what happens if the temperature is decreased?
Answer:
If the temperature of a gadget at equilibrium is decreased, the equilibrium shifts to the proper. Heat is being absorbed, in the reactants. Shifts to the proper to launch the extra heat. When working with a chemical equilibrium equation, treat the strength within the device as though it have been a reactant or product.
please mark me brainliest!
Answer:
It will shift left
Explanation:
Took it on edge
What energy transfer is occurring when you make a call on a phone?
A. electrical to chemical
B. heat to sound
C. electrical to sound
D. chemical to light
Reset Selection
Thermal energy is the energy associated with What?
Answer:
temperature
Explanation:
on edg
Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree Celsius of one gram of a substance. Therefore, thermal energy is the energy associated with internal energy of matter.
What is Enthalpy?Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances.
Mathematically,
q = n ×ΔH
where
q = amount of heat
n = no of moles
ΔH = enthalpy
n = w / M.M
w = given mass
M.M = molar mass
Thermal energy, commonly known as the internal energy, is the energy connected to microscopic types of energy in thermodynamics.
Therefore, thermal energy is the energy associated with internal energy of matter.
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If 6.5 mol NO2 react with 1.0 mol H20, how many moles of the excess reactant
remains when the reaction is complete? 3NO2 + H2O + NO + 2HNO3
1.5 mol H20
2.5 mol H20
O 3.5 mol NO2
O 1.0 mol NO2
Answer:
3.5 moles of NO2.
Explanation:
The balanced equation for the reaction is given below:
3NO2 + H2O —> NO + 2HNO3
Next, we shall determine the excess reactant. This is illustrated below:
From the balanced equation above,
3 moles of NO2 reacted with 1 moles H2O.
Therefore, 6.5 moles of NO2 will react with = (6.5 x 1)/3 = 2.17 moles of H2O.
From the above calculations, we can see that it will take a higher amount i.e 2.17 moles than what was given i.e 1 mole of H2O to react completely with 6.5 moles of NO2.
Therefore, NO2 is the excess reactant and H2O is the limiting reactant.
Next, we shall determine the number of mole of the excess reactant that reacted in the reaction. This is illustrated below:
From the balanced equation above, we can see that 3 moles of NO2 reacted with 1 mole of H2O.
Finally, we shall determine the leftover mole of the excess reactant after the reaction. This is illustrated below:
Given mole of NO2 = 6.5 moles
Reacted mole of NO2 = 3 moles
Leftover mole of NO2 =...?
Leftover mole = Given mole – Reacted mole
Leftover mole of NO2 = 6.5 – 3
Leftover mole of NO2 = 3.5 moles.
Therefore, 3.5 moles of NO2 remained after the reaction.
4. Which of the following statements correctly describe atoms? Select all that apply.
A)Atoms have mass,
B)Atoms are the basic unit of a chemical element.
C)Matter is made of atoms.
D)Atoms take up space.
Answer:
all of the above
Explanation:
adams take up space they take up mass they are the basic chemical unit and matter is made of adams
Answer:
All of them except "Elements are the basic unit of atoms."
Explanation:
I took the quiz :D
Chlorine can bond with fluorine to form CIF. Chlorine can also bond with lithium to form LiCI Which compound will have a greater partial charge?
Answer: [tex]ClF[/tex] will have a greater partial charge.
Explanation:
A polar covalent bond is defined as the bond which is formed when there is a low difference of electronegativities between the atoms, thus resulting in charge difference. Example: [tex]ClF[/tex]
Non-polar covalent bond is defined as the bond which is formed when there is no difference of electronegativities between the atoms and thus there is no charge difference. Example: [tex]F_2[/tex]
Ionic bond is formed when there is complete transfer of electron from a highly electropositive metal to a highly electronegative non metal. The electronegative difference between the elements is high. The charges on cation and anion neutralise each other. Example: [tex]LiCl[/tex]
Thus as [tex]ClF[/tex] will have greater partial charge.
In the electron configuration for scandium (atomic number 21), what is the
notation for the three highest-energy electrons?
Select one:
O a. 30% 452
O b. 453
O c. 3d3
O d. 452 4p?
Answer:
Explanation:
d. 452 4p
hope it helps
Which equations are balanced? Select four options. Mg3N2 + H2O → 3MgO + 2NH3 C3H8 + 5O2 → 4H2O + 3CO2 Zn + 2HCl → ZnCl2 + H2 3Ca(OH)2 + 2H3PO4 → Ca3(PO4)2 + 6H2O 3H2SO4 + 2Fe → Fe2(SO4)3 + H2 4Al + 3O2 → 2Al2O3
Answer:
C3H8 + 5O2 → 4H2O + 3CO2
Zn + 2HCl → ZnCl2 + H2
3Ca(OH)2 + 2H3PO4 → Ca3(PO4)2 + 6H2O
4Al + 3O2 → 2Al2O3
Explanation:
Balanced equations are where the number of elements of on one side equal the other side.
For eg, Na + Cl ---> NaCl (this is balanced because there's 1 Na in reactant and 1 in product, and same case for chlorine)
H2 + O2 ----> H2O (This is not balanced because there's two oxygen on reactant and only one on product so we multiply h2o by two and H2 by 2)
2H2+ O2 ---> 2H2O (now we have 4 hydrogen 2 oxygen in both reactant and product side)
From the options you gave apply this idea of Balanced equations are where the number of elements of on one side equal the other side.
You'll get the following as balanced:
C3H8 + 5O2 → 4H2O + 3CO2
Zn + 2HCl → ZnCl2 + H2
3Ca(OH)2 + 2H3PO4 → Ca3(PO4)2 + 6H2O
4Al + 3O2 → 2Al2O3
Answer:
C3H8 + 5O2 → 4H2O + 3CO2
Zn + 2HCl → ZnCl2 + H2
3Ca(OH)2 + 2H3PO4 → Ca3(PO4)2 + 6H2O
4Al + 3O2 → 2Al2O3
Explanation:
:)
What is a scientific method? A. A method of testing an idea B. The steps required to form a hypothesis C. A way of analyzing data D. The process of proving a theory
Answer:
A. A method of testing an idea
Explanation:
The steps of the scientific process involve formulating a hypothesis, testing it, analysing the data, making conclusions, and reporting the findings.
Can car oil degrade carbon fiber?
36. What is the formula of pentaphosphorus decoxide?
A)P5010
B)PO 10
C)PO
D)P10 05
Answer:
A)P5010
Explanation:
Penta- means 5 and deca/deco- means 10
Which of these is an example of a physical change?
A)sugar dissolving in warm water
B) iron rusting in the presence of moist air
C) wood burning in the prescence of oxygen
D) baking soda reacting with acid to form a gas
Answer:
sugar dissolving in warm water
Explanation:
it is a physic change because no new substance is form and you can separate the solution by evaporating it
Answer:
A) ugar dissolving in warm water
Explanation:
What is chromatography used for? Select all that apply. ]
dissolving substances
separating liquids in a mixture
crystallizing substances
separating gases in a mixture
Answer:
Separating liquids in a mixture
Separating gases in a mixture
Explanation:
Chromatography is the separation of a mixture by passing it in solution or gas through a medium where the components move at different rates.
Answer:
separating liquids in a mixture
separating gases in a mixture
Explanation:
