In evaporation particles of water take energy in the form of sunlight from the surrounding and then convert into vapor phase. Therefor evaporation is the only reason for the lot more water in air in summer
What is evaporation?Evaporation is a physical process in which the water in liquid state converts to gaseous state at the temperature below its boiling point. Evaporation happens before the boiling process.
Evaporation causes cooling effect in the surrounding. During summer when water is kept in earthen pot water cools, this is because of the evaporation process
Evaporation is affected by temperature. As the temperature increases the rate of evaporation increases and hence in summer there is more evaporation and hence there is lot more water in air
Therefor evaporation is the only reason for the lot more water in air in summer
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Final answer:
The increased water in the air during hot summer days is a result of evaporation, where the sun's heat transforms liquid water into water vapor increasing the humidity in the air.
Explanation:
During hot summer days, the increased water in the air is primarily due to the change of state called evaporation. Evaporation is a process where liquid water on Earth's surface, like lakes and rivers, absorbs heat from the sun and transforms into water vapor. This vapor then enters the atmosphere contributing to the higher humidity we experience during summer times.
Evaporation happens when the sun heats the water, providing energy for the water molecules to escape from the liquid's surface into the air as vapor. It is one of the critical phases in the water cycle, and unlike condensation, which is the change of water vapor into a liquid, evaporation changes liquid into gas. This process is essential as it contributes to cloud formation and precipitation, playing a vital role in weather patterns and ecosystems.
Is rust a pure substance or a mixture? <3
Rust is considered a mixture, not a pure substance, because its composition can vary. It is formed when iron reacts with oxygen and water.
Explanation:Rust is not a pure substance, it is a mixture. In scientific terms, rust is formally known as iron (III) oxide and is formed when iron reacts with oxygen and water. In this case, it behaves as a mixture because its composition can vary depending on the presence and relative abundance of other elements and compounds, such as water and other oxides.
Rust is a mixture rather than a pure substance. It is formed when iron reacts with oxygen in the presence of water or moisture, resulting in the formation of iron oxide, which is the reddish-brown substance we commonly refer to as rust. This mixture consists of iron oxide as well as other impurities, such as traces of water and other metals present in the environment.
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humans protect themselves from natural disasters by all of the following expect ?
a. dams
b. sunscreen
c. building homes and shelters
d. levees
Caleb wants to find out which type of floor material is best for bouncing tennis balls the highest. Which statement best describes the process he should use?
He should use technological design because he will need to make materials.
He should use scientific investigation because he will need to do an experiment.
He should use technological design because he will need to conduct background research.
He should use scientific investigation because he will need to design a prototype.
Answer:
B. He should use scientific investigation because he will need to do an experiment.
Is 2Na + Cl --> 2 NaCl a balanced chemical equation? Is it obeying the law of conservation of matter?
Question 4 options:
Yes it is balanced. It has the same number of Na and Cl on both the reactant side and the product side.
No it is not balanced. It has more Cl on the product side than the reactant side.
No it is not balanced it has more Na on the reactant side than the product side.
Answer : No it is not balanced. it has more Cl on the product side than the reactant side.
Explanation :
The given chemical equation is,
[tex]2Na+Cl\rightarrow 2NaCl[/tex]
But the net balanced chemical equation is,
[tex]2Na+Cl_2\rightarrow 2NaCl[/tex]
Law of conservation of matter : In a chemical reaction, the mass of products must be equal to the mass of reactants.
For Net balanced chemical equation:The mass of reactant side, 2Na + [tex]Cl_2[/tex] = 2(23) + 2(35.5) = 117
The mass of product side, 2NaCl = 2(23 + 35.5) = 117
This means, the mass of product is equal to the mass of reactant. The mass remains conserved.
For Given chemical equation:The mass of reactant side, 2Na + Cl = 2(23) + 35.5 = 81.5
The mass of product side, 2NaCl = 2(23 + 35.5) = 117
This means, the mass of product is not equal to the mass of reactant. The mass is not conserved.
Which contribution added to Rutherford's discovery of a positive nucleus?
Atoms are indivisible.
Electrons are scattered in an atom.
Neutrons are inside the nucleus of an atom.
Atoms of the same element have the same properties.
C : " Neutrons are inside the nucleus of an atom" is the answer because, Rutherford theorized if the neutrons were in the center and the electrons were orbiting in separate energy levels the protons would be in the nucleus to keep the neutrons from floating. If the nucleus has neutral and positive particles, then it will be positive nucleus. Hope this helps
The discovery that added to Rutherford's discovery of a positive nucleus is neutrons are inside the nucleus of an atom.
Rutherford, through his ground breaking experiment with a thin gold foil was able to show that the nucleus is composed of a positively charged core called the nucleus.
In addition to this discovery, Chadwick in 1932 discovered the neutrons which are neutral particles but are also contained in the nucleus. They contribute to the mass of the atom.
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How many atoms of phosphorus are in 5.40 mol of copper(II) phosphate?
Answer:
There are
4.09
×
10
24
atoms of phosphorus in
3.40 mol
copper(II) phosphate.
Explanation:
The formula unit for copper(II) phosphate is
Cu
3
(PO
4
)
2
. If the formula unit represents 1 mole of copper(II) phosphate , then there are 2 moles of phosphorus per 1 mole copper(II) phosphate formula units.
One mole of atoms =
6.022
×
10
23
atoms
.
During the process of answering this question, we will go from:
mol Cu
3
(PO
4
)
2
→
mol P
→
atoms P
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Mol Cu
3
(PO
4
)
2
to
Mol P
Multiply mol
Cu
3
(PO
4
)
2
by mol ratio between
P
and
Cu
3
(PO
4
)
2
, 2:1.
3.40
mol Cu
3
(PO
4
)
2
×
2
mol P
1
mol Cu
3
(PO
4
)
2
=
6.80 mol P
Mol P
→
Atoms P
Multiply mol
P
by
6.022
×
10
23
atoms/mol
.
6.8
mol P
×
6.022
×
10
23
atoms P
1
mol P
=
4.09
×
10
24
atoms P
rounded to three sig figs
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
You can put all the steps into one equation.
3.40
mol Cu
3
(PO
4
)
2
×
2
mol P
1
mol Cu
3
(PO
4
)
2
×
6.022
×
10
23
atoms P
1
mol P
=
4.09
×
10
24
atoms P
In 5.40 moles of copper(II) phosphate, there are 6.50 x 1024 atoms of phosphorus.
Explanation:The number of atoms in a certain amount of a substance can be determined using Avogadro's number, which is 6.022 x 1023 atoms/mole. First, we need to determine the mole ratio between phosphorus and copper(II) phosphate. The formula for copper(II) phosphate is Cu3(PO4)2, meaning each molecule contains two phosphorus atoms. Therefore, in 5.40 moles of copper(II) phosphate, there are 2 times 5.40, or 10.80 moles of phosphorus. To find the number of atoms, we multiply the number of moles by Avogadro's number: 10.80 moles x 6.022 x 1023 atoms/mole = 6.50 x 1024 phosphorus atoms.
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Find and report the reduction potentials of lithium, sodium, and potassium.
The electrode potential values of [tex]{\text{L}}{{\text{i}}^ + }[/tex] ,[tex]{\text{N}}{{\text{a}}^ + }[/tex] and [tex]{{\text{K}}^ + }[/tex] are [tex]\boxed{ - 3.045{\text{ V}}}[/tex] , [tex]\boxed{ - {\text{2}}{\text{.714 V}}}[/tex] and [tex]\boxed{ - {\text{2}}{\text{.925 V}}}[/tex]respectively.
Further explanation:
Electrochemical cells are the devices that are used to generate an electric current from the energy released by the spontaneous redox reaction. Redox reactions involve the transfer of electrons between the chemical species by oxidation and reduction process. The oxidation process represents the loss of electrons and reduction process represents the gain of electrons.
In order to determine the standard reduction potential, the electrode is coupled with standard hydrogen electrode as illustrated in the attached image. The SHE acts as anode and the metal electrode acts as the cathode. The value of reduction potential for hydrogen has been assigned as 0.00 V.
The formula to calculate cell potential [tex]\left( {{E_{{\text{cell}}}}} \right)[/tex] of the reaction when the reduction occurs as cathode and oxidation occur at anode is as follows:
[tex]{E_{{\text{cell}}}} = {E_{{\text{cathode}}}} - {E_{{\text{anode}}}}[/tex]
The expression of Nernst equation that relates the reduction potential of a half or full electrochemical cell reaction to the standard electrode potential is given as,
[tex]{E_{{\text{cell}}}} = E_{{\text{cell}}}^\circ - \dfrac{{2.303RT}}{{nF}}\log \dfrac{{\left[ P \right]}}{{\left[ R \right]}}[/tex] ……. (1)
Here,
[tex]{E_{{\text{cell}}}}[/tex] is cell potential.
[tex]E_{{\text{cell}}}^\circ[/tex] is standard cell potential.
[tex]R[/tex] is gas constant and is equal to [tex]8.314{\text{ J/K}} \cdot {\text{mol}}[/tex].
[tex]T[/tex] is temperature.
[tex]n[/tex] denotes the number of moles of electrons transferred in the reaction.
[tex]F[/tex] is Faraday constant and is equal to [tex]95484.56{\text{ C/mol}}[/tex] .
[tex]\left[ P \right][/tex] is the concentration of product.
[tex]\left[ R \right][/tex] is the concentration of reactant.
At standard temperature [tex]25\;^\circ {\text{C}}\left( {298{\text{ K}}} \right)[/tex] the value of [tex]\dfrac{{2.303RT}}{F}[/tex] is equal to [tex]0.0592{\text{ V}}[/tex]. Thus the equation(1) is written as,
[tex]{E_{{\text{cell}}}} = E_{{\text{cell}}}^\circ - \dfrac{{0.0591}}{n}\log \dfrac{{\left[ P \right]}}{{\left[ R \right]}}[/tex] …… (2)
Knowing the concentration of the electrolyte solutions taken in the cathodic compartment and substituting the values in the Nernst equation gives the reduction potential for the half cell.
The electrode potential values of [tex]{\mathbf{L}}{{\mathbf{i}}^{\mathbf{ + }}}[/tex] ,[tex]{\mathbf{N}}{{\mathbf{a}}^{\mathbf{ + }}}[/tex] and [tex]{{\mathbf{K}}^{\mathbf{ + }}}[/tex] are [tex]{\mathbf{ - 3}}{\mathbf{.045 V}}[/tex], [tex]{\mathbf{ - 2}}{\mathbf{.714 V}}[/tex] and [tex]{\mathbf{ - 2}}{\mathbf{.925 V}}[/tex] respectively as determined with respect to standard hydrogen electrode at [tex]{\mathbf{298 K}}[/tex].
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Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Electrochemistry
Keywords: Electrochemical cells, Redox reactions, Oxidation, reduction, cell potential, half-cell, Nernst equation and Faraday constant.
The reduction potential describes the ease with which electrons are accepted by chemical species.
The term reduction potential is a measure of the ease with which a chemical specie accepts electrons and becomes "reduced". The more negative the reduction potential of a chemical specie, the more difficult it is for that chemical specie to accept electrons and become reduced.
The reduction potentials of lithium, sodium, and potassium are as follows;
Lithium = -3.04 VSodium = -2.71 VPotassium = -2.93 VLearn more: https://brainly.com/question/11969651
Is nail polish a pure substance or a mixture?
Nail polish is a mixture made up of solvents, polymers, colorants, and additives. It can be physically separated into its different components.
Explanation:Nail polish is a mixture, not a pure substance. It is made up of different components, such as solvents, polymers, colorants, and additives. These components are not chemically bonded together and can be separated from each other.
For example, if you leave a bottle of nail polish open, the solvents will evaporate, leaving behind a dried-up mixture. Additionally, if you mix two different colors of nail polish together, you will create a new mixture with a blend of the two colors. Therefore, nail polish is considered a mixture because it contains multiple substances that can be physically separated.
Nail polish is not a pure substance, but rather a mixture of several substances. A pure substance has a constant composition with fixed ratios of elements, but nail polish consists of a blend of different chemicals including solvents, film formers, resins, and plasticizers. Each of these components contributes to the characteristics of the final product, such as its ability to adhere to the nail, its durability, and its shine.
For instance, the film formers and resins create the hard coating on your nails that lasts for days, while the plasticizers provide flexibility so the polish doesn't chip or crack. Solvents are used to keep the other components in a liquid state so they can be easily applied to the nails. Once the polish is applied, the solvents evaporate, leaving behind the hard, colored film on the nail. This makes nail polish a mixture and not a pure substance.
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Nail polish is a homogeneous mixture, not a pure substance. It comprises many components like nitrocellulose, solvents, coloring agents, and plasticizers, each maintaining its own chemical identity within the mixture.
Explanation:Nail polish is not a pure substance but a homogeneous mixture. A homogeneous mixture is a combination of substances with a uniform composition. In the case of nail polish, it is a mixture of several components including but not limited to nitrocellulose, solvents, coloring agents, and plasticizers. Each of these components maintains its own chemical identity within the mixture; they are not chemically bonded into a new, larger chemical compound, which distinguishes mixtures from pure substances that consist of only one type of matter.
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Which substances will make a salt when combined? Vinegar and antacids Soda and wine Soap and ammonia Fertilizer and detergent
Salt is usually formed during neutralization reactions, that is the reaction of an acid and a base. This is illustrated as follows:
HX + YOH --> XY + H2O
where XY is the salt
From the given choices, the only pair of acid and base is:
Vinegar and antacids
Answer is: vinegar and antacids.
Neutralizationis is reaction in which an acid (in this example vinegar or acetic acid CH₃COOH) and a base (in this example antacid, aluminium hydroxide, magnesium hydroxide or some other base) react quantitatively with each other.
Balanced chemical reaction of vinegar and antacid:
2CH₃COOH(aq) + Mg(OH)₂(aq) → (CH₃COO)₂Mg(s) + 2H₂O(l).
Magnesium acetate ((CH₃COO)₂Mg) is a salt.
Potassium and sodium chloride are similar in charge and they both have the same anion. When comparing sodium chloride (36 g / 100 mL at 0 oC) and potassium chloride, which has a higher solubility at 0 oC?
How will the following system react when an increase in pressure occurs? Note: all species are gases. N2O4 <--> 2NO2 Question 9 options:
a. More N2O4 is produced.
b. There is no way to predict how the increase in pressure will affect this system without more information.
c.No change occurs.
d.More NO2 is produced.
a is incorrect just took the test
List 3 properties of metalloids.
Metalloids are those elements which possess the characters of both metals and non-metals .
What do you mean by metalloids ?A metalloid is an element that has properties between metals and nonmetals. Metalloids can also be called semimetals.
Important use of metalloid is -:
Metalloids are useful in the semiconductor industry.
Properties of metalloids are -:
Metalloids are all solid at room temperature. They can form alloys with other metals. It is a much poorer conductor of heat and electricity than the metals.These mentioned properties describes about the properties of metalloids.
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How do the cells of a multicellular organism differ from those of a unicellular organism
Answer:
The cells of unicellular organism is not equipped for different function which means that it do not have different types of cells differentiated into different types performing different functions.
They are made of single cells that perform all the essential functions necessary for survival of organism.
Whereas, a multicellular organism have different types of cells that are employed for different functions.
Example:The hepatocytes are equipped for filtering blood and waste removal. The red blood cells are equipped to transport oxygen to various parts of the body.
How many grams of oxygen are formed when 8.20 moles of KOH are formed? 4 KO(s) + 2 H2O(l) → 4 KOH(s) + O2(g)
Answer : The mass of oxygen formed are 65.6 grams.
Explanation :
First we have to calculate the moles of [tex]O_2[/tex]
The given balance chemical reaction is:
[tex]4KO(s)+2H_2O(l)rightarrow 4KOH(s)+O_2(g)[/tex]
From the balanced chemical reaction we conclude that,
As, when 4 moles of KOH formed then 1 mole of [tex]O_2[/tex] will be formed
So, when 8.20 moles of KOH formed then [tex]\frac{8.20}{4}=2.05[/tex] mole of [tex]O_2[/tex] will be formed
Now we have to calculate the mass of [tex]O_2[/tex]
[tex]\text{ Mass of }O_2=\text{ Moles of }O_2\times \text{ Molar mass of }O_2[/tex]
Molar mass of [tex]O_2[/tex] = 32 g/mole
[tex]\text{ Mass of }O_2=(2.05moles)\times (32g/mole)=65.6g[/tex]
Therefore, the mass of oxygen formed are 65.6 grams.
which kind of energy dose a stretched rubber band have
can someone plz help with This question thxs
Examine the false statement.
The alkali earth metals have five valence electrons.
Select the rewording of the statement that is true.
The alkali earth metals have one valence electron.
The alkali earth metals have two valence electrons.
The halogens have five valence electrons.
The alkali metals have five valence electrons.
Answer:
The alkali earth metals have one valence electron.
Explanation:
Alkali earth metals are elements that constitute Group I in the periodic table. These include: lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs) and francium (Fr).
The alkali earth metals are characterised by a outer or valence electron configuration of ns¹.
Li = 2s¹, Na = 3s¹, K = 4s¹, Rb = 5s¹, Cs = 6s¹
Therefore, in their outermost or valence shell these elements have only one electron.
Hence the given statement: that the alkali earth metals have 5 valence electrons is false. Instead it should be reworded as:
The alkali earth metals have one valence electron.
The alkali earth metals, located in the second group of the periodic table, have two valence electrons, not five. So, the true rewording of the given statement should be 'The alkali earth metals have two valence electrons'.
Explanation:The statement that 'The alkali earth metals have five valence electrons' is incorrect. The alkali earth metals, which occupy the second group of the periodic table, actually have two valence electrons. Therefore, the correct rewording of the statement would be 'The alkali earth metals have two valence electrons'.
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In science, Jill is learning about solids such as brass, bronze, and steel. How should she classify these materials?
C. Homogeneous mixtures These alloys are homogeneous mixtures because they have a uniform composition throughout.
Answer:
Homogeneous Mixture
Explanation:
Which of the following is a reasonable ground-state electron configuration?
a. 1s2 1p6 2s2 2p6 3s2
b. 1s2 2s2 2p6 3s2 3p6 4s2 4d8
c. 1s2 2s2 2p6 3p6
d. 1s1 2s2 2p6 3s1
Answer:
b) 1s2 2s2 2p6 3s2 3p6 4s2 4d8
Explanation:
Electron configuration of an atom is given based on the Aufbau principle which states that electrons are arranged in orbitals such that the lower energy orbitals are filled first. The increasing energy order of orbitals is:
1s < 2s < 2p < 3s < 3p < 4s < 3d < 4p....
s, p ,d orbitals can accommodate a maximum of 2,6 and 8 electrons respectively.
Based on the above ordering, the most reasonable ground state configuration would be:
1s2 2s2 2p6 3s2 3p6 4s2 4d8
Hydrogen peroxide is sold as a 3.0% (by mass) solution. The rest of the solution is water . How many grams of hydrogen peroxide are in 250 grams of this solution?
The question deals with percent by mass calculations. For a 3.0% by mass solution of hydrogen peroxide, there are 3 grams of hydrogen peroxide in every 100 grams of the solution. Therefore, a 250-gram solution would contain 7.5 grams of hydrogen peroxide.
Explanation:The solution of hydrogen peroxide is 3.0% by mass. This means that there are 3 grams of hydrogen peroxide in every 100 grams of solution. Therefore, in 250 grams of solution, the amount of hydrogen peroxide can be calculated by setting up a proportional equation:
(3 grams H2O2 / 100 grams solution) = X grams H2O2 / 250 grams solution
To solve for X, which represents the amount of hydrogen peroxide, cross multiply and divide:
(3 g H2O2 x 250 g solution) / 100 g solution = 7.5 g H2O2
So, there are 7.5 grams of hydrogen peroxide in a 250-gram solution.
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is NaCH an element ? why or why not?
Which of the answer choices correctly describes nonmetals?
conduct electricity poorly
used in electronics frequently
conduct heat easily
pulled into wires easily
n ideal gas is stored in a container at constant volume. If the temperature (T) were increased to 3T, what would be the change in pressure (P)?
A. The pressure will remain unchanged.
B. The pressure will increase by 1.5P.
C. The pressure will decrease by 3P.
D. The pressure will increase by 3P.
Enter the net ionic equation, including phases, for the reaction of AgNO3(aq) with K2SO4(aq). Solubility Rules are found here.
What tool uses the genotypes of parents to predict the possibility of the phenotypes of the offspring? it is punnet square
Which of these best describes the particle motion taking place as CO2 gas is exposed to freezing temperatures?
The options in the question are as follows
a. The motion of particles becomes random.
b. The motion of the particles is unchanged.
c. The particles move with more force.
d. The particles decrease in speed.
Answer:
The particles decrease in speed.
Explanation:
In a gas at room temperature, the particles of the gas move at a very high speed and in a random manner. A gas has no definite volume and it is also assumed that there is minimal interaction between gas particles. Recall that temperature is a measure of the average kinetic energy of the particles of a system. As the temperature is decreased and heat is withdrawn as the CO2 approaches freezing temperature, the speed and kinetic energy of the particles decreases and significant interaction between particles is observed. Hence the CO2 particles slow down.
Why was it important to have endothermic and exothermic processes in the building materials of your train?
a.Which engines released thermal energy in an exothermic reaction?
b.Which engines absorbed thermal energy in an endothermic reaction?
What is the main role of a hormone?
To provide energy to the cells all over the body after release into the circulation
To carry information to cells in the body at different places from where it's released into the blood
To carry respiratory gases in the blood
To go out of and then into the nerve axon as part of the wave of excitation sending messages from one place to another
PLEASE NO INCORRECT ANSWERS
Answer is: To carry information to cells in the body at different places from where it's released into the blood.
Hormones are chemical messengers that travel through the blood and body fluids to organs and tissues to modify and control functions.
For example, estrogen and testosterone are hormones.
Testosterone is synthesized in several steps from cholesterol and is converted in the liver. It is the male sex hormone and an anabolic steroid.
Estrogen is synthesis in theca interna cells in the ovary, by the synthesis of androstenedione from cholesterol. It is the primary female sex hormone.
what do animal cells need in order to maintain homeostasis A. light energy B. carbon dioxide C. chemical energy D.carbon monoxide
Scientists have established that some of the layers of Earth are solid, some are liquid, and some are semi-fluid. Explain how the scientists are able to determine the liquid and solid layers. Use at least two pieces of evidence to support your answer.
Answer: Several studies has been made in order to understand the layers of the earth. Some of the evidences that proved the existence of solid and liquid layers are as follows-
According to the concept of Isostacy, the earth's crust is a like a solid wooden block, that floats over a vast liquid which is compared here with the mantle. Due to the variation in the crustal density, the crust sinks or gets uplifted.From the geophysical point of view, the study of the seismic waves made clear that the earth is comprised of three distinct layers such as the crust, mantle and the core. Crust refers to to top layer, mantle is the middle part and core is the interior part of the earth which is divided into two types, inner core (solid in nature) and outer core (liquid in nature).An object with a density of 1.7 g/ml will float in water
True or False