Answer:
Ways we use radio waves on Earth are television and FM and AM radio broadcasts, military communications, mobile phones, ham radio, wireless computer networks, and numerous other communications applications.
Explanation:
Ways we use radio waves on Earth are television and FM and AM radio broadcasts, military communications, mobile phones, ham radio, wireless computer networks, and numerous other communications applications.
What are radio waves?An electromagnetic wave of a frequency between about [tex]10^4[/tex] and [tex]10^{11}[/tex]or [tex]10^{12}[/tex] Hz, as used for long-distance communication.
AM and FM Radio Broadcasting which involves transmitting sound to a wide audience.
Radar is a detection system that uses radio waves to get information about objects.
Bluetooth and wireless communication use radio waves to create connections between devices.
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Geysers are formed when groundwater is heated by nearby magma. Please select the best answer from the choices provided T F
If y’all can answer this I’ll give you’ll some extra points
From observing the reaction, what would you predict to be delta H and delta S for the hydration of CaO? Warning. This is a tricky question. To help you determine the correct answer, the chemical reaction involving CaO and water is written below. Remember to us the rules you learned about assigning the sign of delta S
2CaO(s) + H2O(l) —> 2Ca(OH)2(s)
Based on the nature ofbthe reaction, entropy (ΔS) increases while enthalpy (ΔH) decreases.
What are entropy and enthalpy changes?Entropy changes, ΔS, refers to change in the degree of the disorderliness of a substance.
When substances become more random, entropy increases and vice versa.
For example, change of state from solid to liquid or gas results in increase in entropy.
Enthalpy changes, ΔH, refers to the changes in heat content of a substance, either a decrease or increase.
Enthalpy is negative when heat is lost and positive ehen heat is gained.
The enthalpy and entropy changes in the given reaction below is as follows:
2CaO(s) + H2O(l) —> 2Ca(OH)2(s)
Entropy, ΔS increases as the substance dissolves in water.
Enthalpy, ΔH, decreases as the substances gives off heat.
Therefore, in the given reaction entropy (ΔS) increases while enthalpy (ΔH) decreases.
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HELP PLS WILL GIVE BRAINLIEST AND THANKS
In a reaction chamber, 3.0mol of aluminum is mixed with 5.3mol Cl2 and reacts. The reaction is described by the following balanced chemical equation.
2Al + 3Cl2 ==> 2AlCl3
a)Identify the limiting reagent for the reaction.
b)Calculate the number of moles or products formed
Answer:
you have school on Sunday?
Imagine that you are a leaf on a plant, and you realize that you are running low on supplies to do your job. You decide to text the roots to set up a delivery. Write a text message conversation between the leaf and the roots that discusses and arranges this delivery.
Be sure to answer these questions in your conversation:
• Which supplies is the leaf running out of? • What are the supplies needed to do? • How will the roots get the supplies from outside the plant? • How will the supplies get from the roots to the leaf?
The leaves of plants primarily serve to photosynthesize and require water conducted by the root to do so.
Water conduction by the rootAs a leaf of a plant running low on supplies that the root is responsible for, what I will be needing is water.
Thus, I will have to send a text message to the root to supply me with water. The root will respond by asking its foot soldiers (the root hairs) to conduct water into the root.
Once water gets into the root, it enters special cells that are responsible for conducting water inside plants - the xylems. The root sends the water through the xylem and water travels from there to me - the leaf.
Once the water gets to me, I will use it in combination with inorganic carbon (carbon dioxide) to synthesize carbohydrates.
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The gas in a balloon occupies 2.25 L at 298 K and 300 kPa. At
what temperature will the balloon expand to 3.50L and 2.17 atm?
If a gas in a balloon occupies 2.25 L at 298 K and 300 kPa, the temperature at which the balloon expand to 3.50L and 2.17 atm is 345.23K.
How to calculate temperature?The temperature of an ideal gas can be calculated using the following formula:
P1V1/T1 = P2V2/T2
Where;
P1 = initial pressureP2 = final pressureV1 = initial volumeV2 = final volumeT1 = initial temperatureT2 = final temperatureAccording to the information given in this question;
P1 = 300kpa = 2.96 atmP2 = 2.17 atmV1 = 2.25LV2 = 3.50LT1 = 298KT2 = ?2.96 × 2.25/298 = 2.17 × 3.5/T2
0.022T2 = 7.595
T2 = 7.595 ÷ 0.022
T2 = 345.23K
Therefore, if a gas in a balloon occupies 2.25 L at 298 K and 300 kPa. the temperature at which the balloon expand to 3.50L and 2.17 atm is 345.23K.
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In the case of pathogen infections, chronic inflammation indicates
that the host does not have functional defense mechanisms.
that the host is fighting a lengthy battle against the pathogen.
that the pathogen has become an established part of the host's resident microbiota.
that the pathogen infection has been effectively overcome by the host.
Answer:
The answer is that the pathogen has become an established part of the host's resident microbiota. :)
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Draw the structure of the organic product formed by heating succinic acid.
The product of heating succinic acid is succinic anhydride, which is a structure with four carbon atoms, four hydrogen atoms, and three oxygen atoms.
What happens if you heat succinic acid?If succinic acid is heated the initial reactant (succinic acid) releases water, which changes the identity of the substance as succinic acid becomes succinic anhydride.
How to draw the product of this reaction?Draw the formula of the product which is C4H4O3.Using the formula draw the structure.Learn more about chemical reactions in: https://brainly.com/question/22817140
What is the concentration in ppm of sodium fluoride in tap water that has been fluoridated by the addition of 32 mg of naf for every 20 kg of solution?.
ppm = mg/l = mg/kg
32 mg / 20 kg = 1.6 ppm
The concentration in ppm of sodium fluoride in tap water is 1.6 ppm.
What is ppm concentration?
ppm is an abbreviation for parts per million. It can also be expressed as milligrams per liter of a solution.It is a measurement which is equal to mass of a substance per unit volume .
One ppm is equivalent to the absolute fractional amount which is multiplied by a million . It is a best way to describe smaller concentrations in a mixture such as that of gases,liquids or solids . It is a ratio of two quantities which have the same unit. In its full form ppm is expressed as one in a million part.
Depending on the substance being measured 1 ppm is expressed in many different ways, out of which preferred ways are microliters per liter , milligrams per liter and micrograms per liter.
For the given problem, concentration in ppm is found out as, since ppm is miiligrams per liter the concentration is found out as follows:32 mg/20 kg (since kilograms and liters are equivalent) =1.6 ppm
Thus, the final concentration of sodium fluoride in tap water which is fluorinated is 1.6 ppm.
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Chromium (lII) sulphate reacts with potassium carbonate to form chromium (III) carbonate and potassium
sulphate.
Skeleton equation:
Answer:
Cr2(SO4)3+K2CO3---------------->Cr2(CO3)3+K2SO4
BALANCING
Cr2(SO4)3+3K2CO3------------------------->Cr2(CO3)+3K2SO4
Explanation:
At the wavelengths included in Study 1, as the
wavelength of light increases, the reflectance of
Cyanide:
A.
increases only.
B.
decreases only.
C.
increases, then decreases.
D.
decreases, then increases.
Based on the research in Study 1, as the wavelength of light increases, the reflectance of Cyanide: C. increases, then decreases.
What is wavelength?Wavelength is simply defined as the distance (in meters) between two (2) successive crests or troughs of a wave. Thus, wavelength refers to the horizontal distance between two adjacent crests or troughs of a wave.
Generally, there is a linear relationship between the wavelength of light and reflectance. Thus, as the wavelength of light increases, the reflectance of Cyanide in Study 1 increases, before it then decreases.
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complete and balance the following equation b. Br2 + Nacl
What is due to acids formed when atmospheric and volcanic gases mix with water. question 2 options: chemical weathering mechanical weathering root-pry pedalfer
Chemical weathering formed is due to acids formation when atmospheric and volcanic gases mix with water.
What is chemical weathering?Chemical weathering is a type of weathering that involved weakening and disintegration of rock by chemical reactions like acid reactions and so on. These reactions include oxidation, hydrolysis, and carbonation. These processes lead to formatiom or destruction of minerals, thus changing the nature of the rock's mineral composition.
Therefore, Chemical weathering is due to acids formed when atmospheric and volcanic gases mix with water.
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write the name of high quatity of coal
Answer:
Write the name of high quatity of coal
Explanation:
Cassiterite is an ore of a metal tin. What is an ore?
Answer:
Cassiterite is an ore of Sn.It is also called tinstone and has molecular formula of SnO
2 . It is heavy, metallic, hard tin dioxide that is the major ore of tin. It is colourless when pure, but brown or black when iron impurities are present.
cacoH2+2NH4Cl-cacl2+2H2O+HN3
A. how many grame of cacl2 will be formed from the of
A20gm of cacoH2
B 40gm of NH4Cl
Answer:
a 63.428gm
b 41.5 gm
Explanation:
a
70 gm CaCOH2=111gm of CaCl2
40 gm =(111*40)/70
=63.428gm
b
107 gm of NH4Cl =111 gm of CaCl2
40 gm gives =(111*40)/107
=41.5 gm
The major product of the given reaction has the molecular formula c10h16o3. Draw its structure in the most stable tautomeric form.
Tautomers are isomers composed of the same atoms but with different electronic and molecular structures. The most stable tautomeric form is attached.
What is tautomery?
Tautomery is a special case of isomery produced by the change in the position of one or more atoms in the molecule. This change in position modifies the molecular electronic distribution, and hence, the molecular structure.
In solution, isomeres called tautomers are in equilibrium, and the constant interconversion is called tautomerization. Both molecules have the same type and quantity of atoms.
In the proposed example, the product has the molecular formula C₁₀H₁₆O₃. Isomeric molecules must have 6C, 16H, and 3O. However, the distribution of these atoms varies, leading to a change in the product molecule structure.
In the attached files you will find an example. You should check if this is the same example as yours.
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what are two basic properties of the gas phase
Answer:
It has no definite shape or volume.
Which lewis dot diagram shows an atom that needs 2 more electrons in its outermost shell?.
Answer:
Fluorine needs two more electrons on the outermost shell.
Explanation:
I'm in K12 too.
Which two organisms are most likely to be competitors?
chipmunk, cow
snake, hawk
snake, badger
chipmunk, badger
_____is the force created when an object is physically pushed or pulled. *
1 point
A. applied force
B. friction
C. gravity
D. magnetism
Answer:
applied force .....I'm pretty sure
Answer:
A. Applied forces aka Contact forces
Explanation:
Thos force is created when you apply forces to an object as in a push/pull or other physical ways.
I hope it helps! Have a great day!
Anygays-
Pumice is a volcanic rock that contains many trapped air bubbles. A 225- gram sample is occupied 236.6ml.
a. What is the density of pumice (answer is 0.951g/ml)
density of the pumice.
solution:density= mass/ volume (d= m/v)
= 225/236.6
= 0.951g/ml
so, the density of pumice is 0.951g/ml.
[tex]{\boxed{{ formula :}}} [/tex]
[tex] →\bold{Density = \frac{mass}{volume} }[/tex]
[tex]{\boxed{{ Given :}}} [/tex]
[tex]→\bold{Mass = 225 g }[/tex]
[tex]→\bold{ Volume = 236.6 ml}[/tex]
[tex]{\boxed{{ Solution :}}} [/tex]
[tex]→\bold{Density = \frac{mass}{volume} }[/tex]
[tex]→\bold{ Density = \cancel{ \frac{225 g}{236.6 ml}} = 0.951 g/ml}[/tex]
The density of pumice is 0.951 g/ ml .
Which of the following is a structure of a cow?
O Possessing sharp teeth.
O Having hooved feet.
O Coming when called.
O None of the above.
Answer:
None of the above.
Explanation:
None of thesse things are part of the structure of a cow, cows have dished forhead 4 stomachs and angular body not sharp teeth comin when called or hooved feet.
Increasing the amplitude means you are increasing what of a wave?
What’s the answer for this?
Answer:
it will fall then rise and return to ×
i need help balancing the equation and number 4
Explanation:
I hope this helps answer your questions
Why is most space exploration
accomplished with spacecraft that do not have
crews on board?
Answer:
why is most space exploration accomplished with spacecraft that do not have crews on board? humans face many challenges in space. what is one advantage of using an orbiter to study objects in space? can be used for long periods of time.
HELPPPPP
A sample of gas contains 6 mol in a 22 L flask at 238 K. What is the pressure of the gas in atmospheres?
The pressure of the sample of gas with the given mol, volume and temperature is 5.33atm.
Ideal Gas LawThe Ideal gas law or general gas equation emphasizes on the state or behavior of a hypothetical ideal gas. It states that "pressure P times volume V is equal to moles times temperature and the universal gas constant. It is expressed;
PV = nRT
Where P is pressure, V is volume, n is the amount of substance, T is temperature and R is the ideal gas constant ( 0.08206 Latm/molK ).
Given the data in the question;
Amount of gas n = 6molVolume V = 22LTemperature T = 238KPressure P = ?We substitute our values into the expression above to determine the pressure of the gas in atmospheres.
PV = nRT
P = nRT / V
P = ( 6mol × 0.08206Latm/molK × 238K ) / 22L
P = 117.18168Latm / 22L
P = 5.33atm
Therefore, the pressure of the sample of gas with the given mol, volume and temperature is 5.33atm.
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What are examples of pollution that can result from mining operations?
Answer:
Acid mine drainage
metal contamination,
increased sediment levels in streams
Explanation:
ACID MINE DRAINAGE
Mine waste, heavy metals and acidic water often end up in streams and rivers.
METAL CONTAMINATION
Heavy metals also affect the biodegradability of organic pollutants, making them less degradable and thus causing double the effect of polluting the environment.
Answer: salt and petroleum
Explanation:
Just took this today and im pretty sure this is the right one
Which of the following formulas should be classified as an acid?
O Na₂SO4
O NaHCO3
O NaOH
O H₂SO4
Answer:
D) H₂SO4 is an acid
Explanation:
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H[tex]_2[/tex]SO[tex]_4[/tex] is the chemical formula that should be classified as an acid. Therefore, the correct option is option D.
What is an acid?Any substance that tastes acidic when dissolved in water, alters the colour of some indicators, reacts with the some metals to release hydrogen, reacts using bases to produce salts, and stimulates some chemical reactions is considered to be an acid. The inorganic chemicals referred to as being mineral acids sulfuric, nitrous, hydrochloric, or phosphoric acids are examples of acids.
The phenolic, sulfonic, and carboxylic acid groups of organic molecules. These chemicals contain one or maybe more hydrogen atoms, which are discharged into highly charged hydrogen ions when they are in solution. H[tex]_2[/tex]SO[tex]_4[/tex] is the chemical formula that should be classified as an acid.
Therefore, the correct option is option D.
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Distinguish between single and double replacement reactions and give an example of
each.
Answer:
i think this is right!
Explanation:
An example of a single replacement reaction occurs when potassium (K) reacts with water (H2O). A colorless solid compound named potassium hydroxide (KOH) forms, and hydrogen gas (H2) is set free. The equation for the reaction is: 2K + 2H2O → 2KOH + H.
An example of a double replacement reaction is the reaction between silver nitrate and sodium chloride in water. Both silver nitrate and sodium chloride are ionic compounds. Both reactants dissolve into their ions in aqueous solution.