Answer:
Yea the girl above me is correct
Explanation:
Sound travels in waves. Sound waves are compression waves. Pick the place where it is impossible to hear sounds.
A)
B)
C)
D)
Answer:
c
Explanation:
Sound travels in waves, option C will be the correct answer where it is impossible to hear sounds.
what is sound ?There are different properties of sound like pitch which is an important property where the perception of frequency of sound occur by human ear within a specific the range of human hearing.
The loudness of sound can be another property which can be determined by amplitude of the sound a measure of the magnitude of the maximum disturbance of sound.
The speed of the sound can be determined as the sound waves travel through the medium and it is different for different mediums, travels fastest in solids.
When sound waves hit the solid surface it reflects back to the same medium as it follows laws of reflection, Timbre is the another property of sound which is used to differentiate sounds of the same frequency.
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Which statement best compares Mercury and Earth?
A.Mercury has very little atmosphere, but Earth has an atmosphere consisting of oxygen.
B.Mercury is very cold, but Earth has moderate temperature to sustain life.
C.They both have liquid water and carbon dioxide in their atmosphere.
D.They both have one moon.
Answer:
A. Mercury has very little atmosphere, but Earth has an atmosphere consisting of oxygen.
Explanation:
Mercury does not have any moon while the Earth has one. Mercury does not have liquid water while 70% of the Earth is covered with water. Mercury has extreme variations of temperature due its close proximity to the Sun. The dark side has extremely low temperature while the lit has has extremely high temperature. The Earth has moderate temperature of about 14 degrees which sustains life.
Mercury has extremely weak atmosphere; probably its has captured some solar wind particles. It comprises of helium, hydrogen, calcium, oxygen etc. Earth has thick atmosphere primarily composed of Nitrogen and Oxygen.
An aqueous solution of sodium hydroxide reacts completely with a solution of hydrochloric acid. After all the water evaporates from the reaction mixture, what will remain
This is acid-base reaction:
NaOH (aq) + HCl (aq) = H2O (l) + NaCl (aq)
After the water evaporated from reaction, NaCl (salt) remains.
In a reaction involving sodium hydroxide and hydrochloric acid, sodium chloride will remain after evaporation of all the water from the reaction mixture.
What is a neutralization reaction?It is a reaction involving acids and bases to form salt and water.
The reaction involving sodium hydroxide and hydrochloric acid is shown in the equation below:
[tex]NaOH + HCl -- > NaCl +[/tex] [tex]H_2O[/tex]
Sodium chloride and water is formed and once all the water is evaporated off from the mixture, the sodium chloride is left.
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A solution of unknown pH was tested with two indicators. Methyl orange turned yellow and methyl red turned red. Which of these could be the pH of the solution?
Is The atoms of the elements have different masses but the same volume true?
Select all that apply.
How may the concentration of chloroform be increased as Cl2 gas reacts with CH2Cl2?
increase [HCl]
remove HCl from the product
increase [Cl2]
the rate of reaction cannot be changed
To increase the concentration of chloroform, you should increase the concentration of Cl2 and remove HCl from the reaction mixture. Increasing [HCl] or changing the reaction rate do not directly increase the chloroform concentration.
To increase the concentration of chloroform (CHCl3) as Cl2 gas reacts with CH2Cl2, several factors can be manipulated according to Le Chatelier's Principle:
Increase [Cl2]: Adding more Cl2 will drive the reaction forward, producing more chloroform.Remove HCl from the product: Removing one of the products, HCl, from the reaction mixture will also shift the equilibrium to the right, favoring the formation of more chloroform.The rate of reaction can indeed be changed by modifying the reaction conditions such as concentration of reactants, temperature, pressure (for gases), or by adding a catalyst.
Increasing [HCl] is not likely to increase the concentration of chloroform because HCl is a product of the reaction between Cl2 and CH2Cl2, and adding more would typically shift the equilibrium to the left, favoring the reactants. The rate of the reaction can be increased by increasing the concentration of Cl2 but this does not necessarily mean that the concentration of chloroform will increase without also removing produced HCl.
Gas in a balloon occupies 3.3 L. What volume will it occupy if the pressure is changed from 100.0 kPa to 90.0 kPa (at constant temperature).
Boyle's law says "the pressure of a fixed
amount of an ideal gas is inversely proportional to its volume when the
temperature is constant".
P α
1/V
Where P is pressure of the gas and V is the volume
of the gas.
Hence, we can use Boyle's law for two different
situations as,
P₁V₁ = P₂V₂
P₁ =
100.0 kPa = 1 x 10⁵ Pa
V₁ =
3.3 L
P₂ =
90 x 10³ Pa
V₂ =?
By substitution,
1 x 10⁵ Pa x 3.3 L = 90 x 10³ Pa x V₂
V₂ = 3.7 L
Hence, if the pressure drops from 100 kPa to 90
kPa, then the volume of the gas will be 3.7 L.
Here, we made an assumption as the gas is an ideal gas.
Final answer:
To determine the new volume of the gas when the pressure changes, we apply Boyle's Law, which leads to a calculation showing that when the pressure decreases from 100.0 kPa to 90.0 kPa, the volume will increase from 3.3 L to 4.07 L at constant temperature.
Explanation:
The student's question pertains to the behavior of a gas inside a balloon when the pressure exerted on it changes at constant temperature. To solve this problem, we can use Boyle's Law, which states that for a given mass of an ideal gas at constant temperature, the pressure and volume of the gas are inversely proportional. Mathematically, this can be written as P1V1 = P2V2.
Given the initial conditions, the pressure P1 is 100.0 kPa and the initial volume V1 is 3.3 L. The final pressure P2 is 90.0 kPa. We want to find the new volume V2. By rearranging the formula to solve for V2, we get V2 = (P1V1)/P2.
Substituting the values we have: V2 = (100.0 kPa * 3.3 L) / 90.0 kPa = 366.7 L/kPa / 90.0 kPa = 4.07 L.
Therefore, when the pressure is decreased to 90.0 kPa, the balloon will occupy a volume of 4.07 L.
Which describes an alkaline solution ?
Question: "Which describes an alkaline solution?"
Answer: C.) basic
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In living organisms.
Granite is which pure substance and mixture
Window cleaner is ammonia dissolved in water. This is an example of a _______.
Granite is a heterogeneous mixture, not a pure substance. It includes minerals like quartz, mica, and feldspar, all with different chemical and physical properties.
Explanation:Granite is not a pure substance; it is a mixture. More specifically, it is a heterogeneous mixture, as there are multiple substances that make up granite that are not uniformly distributed. This includes minerals like quartz, mica and feldspar. Each of these minerals have different chemical and physical properties, making granite a mixture rather than a pure substance.
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________________ structure controls the physical properties of elements. Nucleus Electron
A. Nucleus
B. Electron
The chart shows the solubility of different substances.
Which statement is represented by the graph?
Temperature can change the solubility of a solute.
Temperature has no affect on the solubility of a solute.
Salt has a greater solubility than sugar.
Nitrite salt has a greater solubility than sugar.
The temperature can change the solubility of a solute. Option A is correct.
For many solids that are soluble in liquid water, solubility increases as the temperature increases. The higher the temperature, the more kinetic energy the solvent molecules have available to break down the intermolecular bonds that hold the solute molecules together.
The solubility depends on the solution's temperature. For example, salt solubility increases with increasing temperature whereas calcium sulfate solubility decreases with increasing temperature.
At high temperatures, solubility is high, so the solution dissolves more solute. When the solution cools, solubility decreases, causing the solute to separate out as a solid.
Therefore the correct answer is option A.
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The question is incomplete. The most probable question is given below:
The chart shows the solubility of different substances.
A 3-column table with 6 rows. The first column labeled solute has entries sugar, sugar, salt, salt, nitrite salt, and nitrite salt. The second column labeled temperature has entries 20 degrees C, 100 degrees C, 20 degrees C, 100 degrees C, 20 degrees C, and 100 degrees C. The third column labeled grams per 100 grams of water has entries 204, 487, 36, 39, 81, 160.
Which statement is represented by the graph?
A.) Temperature can change the solubility of a solute.
B.) Temperature has no effect on the solubility of a solute.
C.) Salt has a greater solubility than sugar.
D.) Nitrite salt has a greater solubility than sugar.
Why is it better to give the actual speed of an object rather than to simply say it moved fast or it moved slowly
If two unidentified solids of the same texture and color have different solubilities in 100 grams of water at 20°C, you could conclude that
a.
they are the same substance.
b.
they are different substances.
c.
they have different melting points.
d.
their solubilities will be the same if the water temperature is increased.
they have different melting points.
how many grams of solute are needed to make 2.50 liters of a 0.100 m soultion of kcl?
What is the source of energy used to react chlorine with methane?
Answer:
The source of energy used to react with chlorine and methane is ultraviolet rays or in the presence of sunlight.
Explanation:
The source of energy used to react with chlorine and methane is ultraviolet rays or in the presence of sunlight.This reaction is an example of Photo-chemical reaction.
Photo-chemical reaction is the type of chemical reaction in which energy is imparted to the reactants by the light or reactions initiated by light.
The photo chemical reaction of methane with chlorine in presence of ultraviolet light is given as:
[tex]CH_4+Cl_2\overset{h\nu}\rightarrow CH_3Cl+HCl[/tex]
[tex]CH_3Cl+Cl_2\overset{h\nu}\rightarrow CH_2Cl_2+HCl[/tex]
[tex]CH_2Cl_2+Cl_2\overset{h\nu}\rightarrow CH_1Cl_3+HCl[/tex]
[tex]CH_1Cl_3+Cl_2\overset{h\nu}\rightarrow CCl_4+HCl[/tex]
When electricity flows through water, the water molecules split into molecules of hydrogen and oxygen gas. How many oxygen (O2) molecules are produced from the splitting of two molecules of water (H2O) if the balanced equation for the reaction is as follows? 2H2O 2H2 + O2 A. 4 B. 3 C. 2 D. 1
The number of O2 ( oxygen) molecules that are produced from splitting of two molecules of water is 1 molecule of oxygen ( answer D)
Explanation
A molecule - is a group of two or more atoms held together by a chemical bond.
In the reaction of splitting of 2 molecules of H2O yield 1 molecule of O2.
What are the properties of metal that make it a useful material for electricians
Certain characteristics of metal make it a necessary material for electricians.
Metals are good at conducting electricity. This means that metals are feasible for electricity to travel through them. Generally, all metals are useful in electric work.
Because metals are compatible with electricity, they are crucial for making electrical wires for appliances and other usages. This is the reason that they are preferred by electricians.
Metals have an abundance of electrons. So their outer orbits carry free electrons. And as we know, electrons are the carriers of electricity. They easily get heated up.
Non-conductors of electricity include wood, air, glass, and cotton. Even pure water is non-conductive. That means electricity cannot travel through them.
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Which statement best explains why the sun and the moon appear to be about the same size in the sky?
A). The Sun and moon have the same diameter
B). The Moon is smaller in diameter and is closer to the earth than the sun.
C). The moon is larger in diameter and farther than th earth THAN the sun
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the answer is the first one
retrograde
A solid object has a density of 1.3 g/mL in which liquids will it float explain ?
The object with a density of 1.3 g/mL will float in any liquid that has a density higher than 1.3 g/mL due to the principle of buoyancy.
Explanation:The solid object, with a density of 1.3g/mL, will float in any liquid that has a density higher than 1.3 g/mL. The object’s ability to float depends on the principle of buoyancy, which states that the buoyant force exerted on an object immersed in a fluid is equal to the weight of the fluid displaced by the object. In simpler terms, if the object has a lower density than the fluid it is placed in, it will float as the buoyant force will be greater than the object's weight.
For instance, say you have a liquid with a density of 1.5 g/mL. The object's density is 1.3 g/mL which is less than that of the liquid. Therefore, the object will float in this liquid. Conversely, if the liquid's density is less than 1.3 g/mL, the object will sink as its density is greater.
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Is number 5 right please answer this is due by midnight I’m so stressed?????!!!!!
What is the pOH of a solution where the [OH-] is 7.3 x 10 -2 M?
Answer: 1.14
Explanation:
The pOH of a solution where the [OH-] is 7.3 x 10-² M is 1.14.
HOW TO CALCULATE pOH.
The pOH of a solution can be calculated from the hydroxide ion concentration by using the following formula:pOH = -log[OH-].According to this question, the hydroxide ion concentration (OH-) of a solution is given as: 7.3 x 10-²M. The pOH of the solution can be calculated as follows:pOH = - log {7.3 x 10-²}pOH = 1.14Therefore, the pOH of a solution where the [OH-] is 7.3 x 10-² M is 1.14.Learn more at: https://brainly.com/question/12047300?referrer=searchResults
How does the speed of the object compare when t=6 and t=12
A) the speed of the object at 6s is greater than 12s
B) the speed of the object at 6s is less than that at 12s
C) the speed of the object is the same at both 6s and 12s
D) the speed of the object cannot be determined from the graph
Balance the nuclear reaction equation for the beta minus decay of iodine-131 by completing the missing numbers. es001-1.jpg The superscript of xenon is . The subscript of the electron is .
Balanced nuclear reaction equation for the beta minus decay of iodine-131 is [tex]${}_{{\rm{53}}}^{{\rm{131}}}{\rm{I}} \to {}_{54}^{{\rm{131}}}{\rm{Xe + }}{}_{{\rm{ - 1}}}^0{\rm{e}}$[/tex].
What is nuclear reaction?Nuclear reaction is a reaction which changes the identity of an atomic nuclei, when high energetic particles is bombarded on that.
Beta minus decay is one of the example of nuclear reaction, and in this reaction a neutron decays into an electron which is also known as beta particle having no mass in it. And at the same time gamma rays also. In the question, it is given that iodine-131 shows beta minus decay, where the superscript of xenon is 131 and subscript of electron is -1. i.e.
[tex]${}_{{\rm{53}}}^{{\rm{131}}}{\rm{I}} \to {}_{\rm{x}}^{{\rm{131}}}{\rm{Xe + }}{}_{{\rm{ - 1}}}^{\rm{y}}{\rm{e}}$[/tex]
We have to balance the above equation and for that sum of the superscripts and subscripts is always equal on both left and right sides.
Calculation for superscripts:
131 = 131 + y
y = 0.
Calculation for subscripts:
53 = x - 1
x = 53 + 1 = 54
Hence, balanced nuclear equation can be written as [tex]${}_{{\rm{53}}}^{{\rm{131}}}{\rm{I}} \to {}_{54}^{{\rm{131}}}{\rm{Xe + }}{}_{{\rm{ - 1}}}^0{\rm{e}}$[/tex].
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In terms of intermolecular forces why ethanol has a much higher boiling point than ethene at standard point
Final answer:
Ethanol has a much higher boiling point than ethene mainly due to the ability to form hydrogen bonds, which require additional energy to break, and also due to increased van der Waals dispersion forces resulting from the extra electrons of the oxygen atom and the molecule's size.
Explanation:
The reason ethanol has a higher boiling point than ethene is mainly due to the presence of hydrogen bonds, which are a type of strong intermolecular force. Ethanol's molecular structure allows it to form hydrogen bonds because it contains a hydroxyl group (-OH) with a highly electronegative oxygen atom that can attract hydrogen atoms from other ethanol molecules.
These hydrogen bonds require additional energy to break, significantly elevating the boiling point of ethanol compared to ethene, which lacks this functional group and can only exhibit weaker van der Waals forces.
In addition to hydrogen bonding, ethanol's larger size and the extra electrons brought by the oxygen atom also increase the van der Waals dispersion forces within the substance, contributing to a higher boiling point. Comparing ethanol to propane, which has a similar length and number of electrons but lacks the hydroxyl group, shows that hydrogen bonding is a key factor since ethanol has a boiling point about 100°C higher.
Overall, the presence of hydrogen bonds, accompanied by van der Waals dispersion forces, results in ethanol requiring more energy to transition from liquid to gas, thereby leading to its higher boiling point.
The molecular weight of H2 and the mass of 1 mole of H2 are _____.
a.quantities
b.different quantities
c.inversely related
d.not the same
Answer: a. same quantities
Explanation: According to avogadro's law, 1 mole of every substance contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
Molecular weight of [tex]H_2[/tex] = 2.0 g/mol
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}[/tex]
[tex]\text{Number of moles}=\frac{2g}{2g/mol}=1 mole[/tex]
Now 1 mole of [tex]H_2[/tex] molecule contains = [tex]6.023\times 10^{23}[/tex] of molecules.
Thus both represent same quantities.
Both the brain and the spinal cord are protected by _____.
A.a thick, paste-like substance
B.the skull
C.a watery fluid
D.the vertebral column
ASAP
Which of the following units would be the most appropriate for measuring the mass of a grain of rice? A. milligrams B. grams C. centigrams D. kilograms
The body stores lipids ingested as fat and uses this energy when needed.