Answer:
Energy can neither be created nor destroyed, but it does change its form. And not all forms of energy are usable and it gets dissipated as heat energy and sound energy. The energy that is wasted cannot be recovered.
which element have 6 valence electrons?
Answer:
D. Selenium
Explanation:
If you are talking about elements with a neutral charge, i.e. just usual elements and not ions whatsoever, then we have five elements who match the criteria. They are oxygen (o) sulfur (s) selenium (se) tellurium ( T e ) polonium ( P o )
compare molecular & covalent network crystal solid?
Answer:
Molecular solids and covalent network solids are two types of solid compounds. The key difference between molecular solid and covalent network solid is that molecular solid forms due to the action of Van der Waal forces where as covalent network solid forms due to the action of covalent chemical bonds.
hope this helps
If a tank of gas contains 4 L of N O2 how many molecules are in it
but heres a way to solve it
An athlete takes a deep breath, inhaling 1.85 L of air at 21°C and 754 mm Hg.
T
How many moles of air are in the breath? How many molecules?
Gas constant, R= 8.314 J mol ¹ K-1
PV = nRT
PV
RT
h=
=
P
= 0.08206 L atm mol-1 K-1
= 62.36 L Torr mol-1 K-1 -
1 atm = 760 mm Hg = 760 Torr
754 Forr 1.85€
6236 Jerr 294K
Heat that flows by conduction is the transfer of thermal energy between substances in contact. What must occur for this
to happen?
O The two systems must be the same temperature.
O The two systems must not be touching each another.
O
One system must have higher kinetic energy than the other system.
The thermal energy of one system must be the same as the thermal energy of the other system.
One system must have higher kinetic energy than the other system is the correct statement.
What is conduction?Conduction is the process by which heat is transmitted through the material of a substance when there is a difference of temperature between two bodies.
So we can conclude that One system must have higher kinetic energy than the other system is the correct statement.
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Heat flow by conduction requires that the two systems must not be touching each another.
What is heat energy?Heat energy is a form of energy that exists due to a temperature difference between two objects.
Heat energy flows from an object at higher temperature to an object at a lower temperature.
Heat transfer by conduction involves the vibration of particles of the medium transferring heat due to contact between the two objects.
Therefore, heat flow by conduction requires that the two systems must not be touching each another.
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In an Ionic bond a metal gives a valence to a?
Hi!In an Ionic bond a metal gives a valence to a cation.
what biological molecules transport other substances, provide structural
support, cause the movement of muscles, and catalyze chemical reactions in
living organisms?
The biological molecules that transport other substances are the proteins.
What are proteins?Proteins are biological macromolecules that contains nitrogen in their molecules and are the building block of a living organism.
The proteins perform the following functions:
they transport other substances,provide structural support,cause the movement of muscles, and catalyze chemical reactions in living organisms.Learn more about protein here:
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Is decay pool or flux
Answer:
A single carbon pool can often have several fluxes both adding and removing carbon simultaneously. For example, the atmosphere has inflows from decomposition (CO2 released by the breakdown of organic matter), forest fires and fossil fuel combustion and outflows from plant growth and uptake by the oceans.
Explanation:
Describe the properties of alkaline earth metals. Based on their electronic arrangement, explain whether they can exist alone in nature.
The properties of alkaline earth metals include
highly metallic and good conductors of electricity.What are alkaline earth metals?Alkaline earth metals are the metals that occupies the group two in the periodic table. They include the following:
beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).The properties include the following:
They are highly metallic andThey are good conductors of electricity.Learn more about metals here:
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Answer:
Alkaline metals have valency 2, they have 2 valence electrons, their oxides are basic in nature, and they are electropositive. Alkaline metals are not found in nature alone.
Explanation:
Pls show working too... thanks!!
The maximum volume of hydrogen evolved at room temperature and prressure after taking excess zinc with 0.01 mol HCl is 2.4 [tex]dm^{3}[/tex]
hence correct option is (C)
What is Ideal gas law ?According to this law, the product of the pressure and the volume of one gram molecule of an ideal gas is equal to the product of the absolute temperature of the gas and the universal gas constant.
Given Equation ;
Zn + 2HCl --> [tex]ZNCl_2[/tex] + [tex]H_2[/tex]
Given Quantities ;
Amount of Zinc = Excess
Amount of 1.0 mol/ltr HCl = 100 ml
It means, Number of moles of H = 0.1 mole
Temperature = 298 K
Pressure = 1 Atm
This is a “single state” problem, so we can solve it using the ideal gas law, PV = nRT.
therefore, using Ideal gas equation ;
PV=nRT
1 x V = 0.1 x 0.0821 x 298
volume of hydrogen gas = 2.4 litre ie, 2.4 [tex]dm^{3}[/tex]
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When hydrogen gas is bubbled into 2-butyne, the product is
Answer:
On treatement of 2 -with hydrogen gas and lindlar catalyst, the major product obtained is cis-2butene.
A 25.0 mL sample of an aqueous solution of calcium hydroxide, Ca(OH)2, is titrated to the equivalence point with 21.2 mL of 0.620 M sulfuric acid, H2SO4, acid solution. What is the molarity of the calcium hydroxide solution?
Let's see
C1V1=C2V225C1=21.2(0.620)25C1=13.144C1=0.526MHi, um im in honors chem and at the moment we are doing a 08.06 honors environmental impact and im stuck on this question, i honestly just need help determining what it is asking for...does it want me to put a criteria with a constraint? or just make a list putting them in order (not grouping them together)? . anyways heres the question and the solutions i chose:
prioritization: make one priority list that ranks the criteria and constraints together. explain the ranking of each criterion and constraint, and support your decisions with research.
01. air pollution can be reduced by new regulations from legislation, treaties, and agreements among nations as well as by enforcement of existing regulations with harsher penalties.
02. air pollution can be reduced by conserving energy (large amounts of fossil fuels are used to produce energy), going green, using efficient home energy devices, and using clean energy resources.
Air pollution can be reduced by conserving energy, plant more trees, using efficient energy, and clean energy resources.
How air pollution can be reduced?The air pollution can be reduced by conserving energy, going green, using efficient home energy devices, and using clean energy resources because these actions can reduce the emission of toxic gases into the atmosphere. We should use electrical devices and vehicles instead of fossil fuels vehicles.
So we can conclude that air pollution can be reduced by conserving energy, plant more trees, using efficient energy, and clean energy resources.
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I
10. how many grams of koh are there in 200 grams of 10% by mass koh solution?
Answer: 20 grams
Explanation:
[tex]10=\frac{\text{grams of KOH}}{200}\\\text{grams of KOH}=20[/tex]
Determine the percentage composition of Ptl2
Answer:
Percent Composition
1. Find the molar mass of all the elements in the compound in grams per mole.
2. Find the molecular mass of the entire compound.
3. Divide the component's molar mass by the entire molecular mass.
4. You will now have a number between 0 and 1. Multiply it by 100% to get percent composition.
Avogadro's law relates the volume of a gas to the number of moles of gas
when temperature and pressure are constant. According to this law, how
would the volume of a gas change if a reaction produced 3 moles of gas from
1 mole of gaseous reactants?
A. The volume would be three times the original volume.
B. The volume would be one-ninth of the original volume.
C. The volume would be one-third of the original volume.
D. The volume would be nine times the original volume.
The volume would be three times the original volume is the correct answer.
What change occur in the volume of product?The volume would be three times the original volume because a reaction produced 3 moles of gas from 1 mole of gaseous reactants. The ratio between reactants and products are 1:3 which shows that three times increase occur in the volume between reactant and products.
So we can conclude that the volume would be three times the original volume is the correct answer.
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organic compounds and their uses
What is the pH of a 0.8 M LiOH solution?
a)0.097
b)13.9
c)6.29
d)9.84
Answer: 13.9
Explanation:
LiOH is a base, so the pOH is given by [tex]-\log(0.8)=0.0969[/tex].
So, since pOH + pH = 14, the pH is 14-0.0969, which is about 13.9
Explain how to calculate the number of grams in 5.50 x 1022 atoms.
Answer:
See below
Explanation:
From periodic table, find Mole Weight of the element in question
this is the grams of the element in Avagadro's Number (6.022 x 10^23) of atoms
(5.50 x 10^22) / (6.022 x 10^23) x mole weight = grams
if 6 grams of nitrogen gas is introduced into an evacuated 2 L flask at 28 degrees celsius, what is the pressure inside the flask?
2.59 atm is the pressure inside the flask if 6 grams of nitrogen gas is introduced into an evacuated 2 L flask at 28 degrees celsius.
What is an ideal gas equation?The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).
The computation of the pressure inside the flask is shown below;
As per the ideal gas law
we know that
P V = nRT
where
V = 2 L
T = 28 degrees celsius +273 = 301 K
m= 6 grams
R = 0.0821
Now moles of [tex]N_2[/tex] is
= 6 grams ÷ 28
= 0.21 mol
Now
P = nRT ÷ V
= (0.21 mol × 0.0821 × 301 K) ÷ 2 L
= 2.59 atm
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What determines whether or not a reaction is spontaneous?
Answer:
The two factors that determine whether a reaction is spontaneous are:
Enthalpy: When the reaction gives off energy, then the reaction is said to be spontaneous.
Entropy: It is the measure of randomness in a system. As the randomness of the reaction increases, the spontaneous is the reaction.
That's it
Hope's It's Help
During an asthma attack the airway swells decreasing the volume given to the air molecules to travel to the lungs, according to Charles law what can be done to increase the volume of the airway?
During an asthma attack temperature can be decreased to increase the volume of the airway.
What is Charle's Law ?This law describes how a gas expands as the temperature increases; conversely, a decrease in temperature will lead to a decrease in volume.
[tex]\rm \dfrac{V'}{T'} = \dfrac{V}{T}[/tex]
which means volume is inversely proportional to temperature so the temperature can be decreased in the atmosphere to increase volume of the airway.
This means that, when you inhale cold air, it will change volume as it warms in passing through the sinuses.
As the air warms it expands to a larger volume.
Therefore during an asthma attack temperature can be decreased to increase the volume of the airway.
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There are four cis,trans isomers for 2-isopropyl-5-methylcyclohexanol, where the cis,trans designations of the substituents are made relative to the oh group:
up, up, up (cis,cis)
up, up, down (cis,trans)
up, down, down (trans,cis)
up, down, up (trans,trans)
consider the most stable chair for each of these isomers, and then draw the most stable and least stable isomer based on a comparison of the best chair for each one.
The image is attached with the answer.
What are Isomers ?
Isomers are compounds which have same empirical formula , same number of atoms are present but they have difference in arrangement if the atoms.
It is given that
There are four cis, trans isomers for 2-isopropyl-5-methylcyclohexanol
the cis, trans designations of the substituents are made relative to the oh group
The image is attached with this answer.
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1. How many moles of nitrogen are there in 4.3 × 1023 molecules?
Answer:
0.714 moles
Explanation:
whenever you see × 10^23 molecules
its an Avogadro's number question
Avogadro's number is 6.02214076×10²³
1 mole is 6.02214076×10²³ molecules
4.3 × 10²³ molecules divided by 6.02214076×10²³ molecules per mole =
4.3 × 10²³ ÷ 6.02214076×10²³ =
0.71403179888 moles
socraticorg
What is the molarity of a solution that contains 0.25 mole of solute in 0.50 l of solution?
Answer:
2.0 M
Explanation:
molarity = (moles of solute)/(liters of solution)
molarity = 0.25/0.50 = 2.0 M
Given the following generic chemical reaction , which is the reactant ?
Answer:
X
Explanation:
X is the reactant and Y is the product
A student mixes 40. Ml of 0. 10mhbr(aq) with 60. Ml of 0. 10mkoh(aq) at 25°c. What is the [oh−] of the resulting solution?
After the complete neutralization reaction occurs, excess hydroxide ion is left unreacted the hydroxide ion of the resulting solution, [OH-] is 0.02 M.
What is the concentration of the hydroxide ion, [OH-]?The hydroxide ion concentration is the amount in moles of hydroxide ion in a solution.
The hydroxide ion concentration is written as [OH-].
The equation of the reaction is given below:
1 mole of HBr reacts with 1 mole of KOH
Moles of HBr = 40 mL × 0.1 M = 4 mm moles
Moles of KOH = 60 mL × 0.1 M = 6 m moles
Moles of [OH-] = 6 - 4 = 2 m moles
Volume of solution = 100 mL
[tex][OH-] = \dfrac{2m\; moles}{100\; mL} = 0.02 M[/tex]
Thus, the concentration of the hydroxide ion, [OH-] is 0.02 M.
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Question 6: The Ideal Gas Law (7 points) a. What is the mathematical equation for the ideal gas law? Identify each variable and give its units. (2 points) b. Match the special cases of each gas law with its description. A law may be used more than once. In the equations, k is a constant. (3 points)
The mathematical equation for the ideal gas law is PV = nRT.
What is an ideal gas equation?The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).
(A)
PV = nRT
The ideal gas equation is formulated as: PV = nRT. In this equation, P refers to the pressure of the ideal gas, V is the volume of the ideal gas, n is the total amount of ideal gas that is measured in terms of moles, R is the universal gas constant, and T is the temperature.
(B)
Where the pressure - P, is in atmospheres (atm) the volume - V, is in liters (L) the moles -n, are in moles (m) and Temperature -T is in Kelvin (K) as in all gas law calculations.
(C)
A. Boyle's law
B. Charles's law
C. Avogadro's law
D. Dalton's law
____ [tex]- P_1V_1[/tex] = [tex]P_2 V_2[/tex]
____ [tex]\frac{V}{T}[/tex] = k
____ [tex]\frac{V_1}{T_1}[/tex] = [tex]\frac{V_2}{T_2}[/tex]
____ V = kn
____ PV = k
____- P total = [tex]P_1 + P_2 + P_3 + ...[/tex]
Boyle's law [tex]- P_1V_1[/tex] = [tex]P_2 V_2[/tex]
Charles's law - [tex]\frac{V}{T}[/tex] = K
Charles's law - [tex]\frac{V_1}{T_1}[/tex] = [tex]\frac{V_2}{T_2}[/tex]
Avogadro's law- V = kn
Boyle's law - PV = k
Dalton's law - P total = [tex]P_1 + P_2 + P_3 + ...[/tex]
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1.A solution has a volume of 2500 mL. How
many liters is this?
2. Convert 50 g of calcium carbonate, CaCO3,
into moles.
3. A solution contains 0.42 moles of solute in
0.75 L. Calculate the molarity of the solution.
4. What is the molarity of a solution that contains
15.0 g of NaOH per 500.0 mL of solution?
5. A 250.0 mL solution contains 4.6 g of copper
(II) chloride, CuCl2. Find the molarity of this
solution.
6. How many moles of hydrochloric acid, HCl, are
present in 0.085 L of a 3.0 M solution?
7. A 37.5 mL solution contains 0.181 g of
potassium chromate, K2CrO4. What is the
molarity?
8. What is the molarity of a solution that contains
0.85 g of ammonium nitrate, NH4NO3, dissolved
in a solution with volume 100.0 mL?
9. Calculate the mass of lead (II) nitrate, Pb(NO3)2,
necessary to make 50.0 mL of a 0.100 M solution.
10. What volume of a 0.35 M solution of sodium
chloride could be formed with 25 g of NaCl?
Answer:
2.5litres
0.0005moles
0.56M
0.75M
0.1369M
0.255moles
0.0163M
0.10625M
3.312g
1221.14cm³
Explanations
1. 25÷1000=2.5l
2.Moles=Mass÷RFM
50÷1000÷(100)
0.0005moles
3.I litre=1000cm³
0.75litres=?
750cm³
0.42moles=750cm³
?=1000cm³
0.56M
4. Molarity=Conc. in g/l÷RFM
Conc.g/l
15g=500cm³
1000cm³
30g/l
Molarity
30÷(23+16+1)
0.75M
5.4.6g=250cm³
1000cm³
18.4g/l
Molarity
18.4÷(134.446)
0.1369M
6.3moles=1000cm³
(0.085×1000)
0.255moles
7.Conc.g/l
37.5cm³=0.181g
1000cm³
4.827g/l
Molarity=4.827÷(296)
0.0163M
A group of organisms of the same species that live in an area is called a(n
A population is a group of individuals of the same species living in a particular area at the same time.
What is the population?The whole number of people or inhabitants in a country or region.
A population is the number of living people that live together in the same place. A city's population is the number of people living in that city. These people are called inhabitants or residents. The population includes all individuals that live in that certain area.
Hence, a group of organisms of the same species that live in an area is called a population.
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There are 75.0 g of glucose (molar mass = 180 g/mol) dissolved in 250 mL of solution. What is the molarity of this solution?
A. 0.416 M
B. 1.70 M
C. 2.13 M
D. 3.31 M
Answer:
5.6 m which is molarith this solution