Exit polls are one of the ways the media is able to predict the winners and losers of an election.
Exit polls have historically and in the course of the world been used as a test towards, and hard indicator of, the diploma of election fraud. some examples of this include the 2004 Venezuelan keep in mind referendum and the 2004 Ukrainian presidential election.
A benchmark poll is usually the first ballot taken in a marketing campaign. it's miles often taken before a candidate publicizes their bid for office, but every now and then it happens at once following that assertion after they have had a few possibilities to raise the budget. Polls help citizens study facts approximately each of the applicants. Polls tell the electorate the troubles that applicants assist. Polls discover the pinnacle candidates and the media interview those applicants.
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a mixture with h2 and he exerts a total pressure of 0.480 atm. if there is 1.00 g of h2 and 1.00 g of he in the mixture, what is the partial pressure of the helium gas? round the answer to three significant figures.
A mixture with H₂ and He exerts a total pressure of 0.480 atm. If there is 1.00 g of H₂ and 1.00 g of He in the mixture, the partial pressure of the helium gas is 0.158 atm.
The partial pressure of a gas is defined as the pressure exerted by a individual gas in the gas mixture. The partial pressure for individual gas is calculated using the formula
P(gas)=P(total)×X(gas) (i)
Where, X(gas)- Mole fraction of the gas
mole fraction is calculated using the formula
mole fraction=(moles of individual compound/total moles)
The molar mass of H₂ is 2 g/mol and of He is 4g/mol. Hence moles of H₂ and He is
mol of H₂=1 g×(1 mol/2 g)
=0.50 mol
mol of He=1 g×(1 mol/4 g)
=0.25 mol
Total number of moles are
total mole=(0.50+0.25) mol
=0.75 mol
The mole fraction of He gas is
mol fraction of He=(0.25 mol/0.75 mol)
=0.33
Hence, the partial pressure of He gas after plugging value in equation(i) is
P(He)=0.480 atm×0.33
P(He)=0.1584 atm
P(He)=0.158 atm
Therefore, the partial pressure of helium(He) gas is 0.158 atm.
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A colorimeter is an instrument used to measure the amount of ____________ absorbed by a solution. This absorbance is proportional to the ________ of the solute in solution.
A colorimeter is an instrument used to measure the amount of heat absorbed by a solution. This absorbance is proportional to the concentration of the solute in solution.
A calorimeter is a device used in calorimetry, a procedure for calculating heat capacity and measuring the heat of chemical processes or other physical changes. Among the most popular kinds are differential scanning calorimeters, isothermal micro calorimeters, titration calorimeters, and accelerated rate calorimeters. A straightforward calorimeter is basically a metal container with a thermometer positioned above a combustion chamber. It is one of the measuring tools used in the research of chemistry, biochemistry, and thermodynamics.
To calculate the enthalpy change per mole of substance A in a reaction involving two compounds A and B, the substances are individually introduced to a calorimeter and the beginning and final temperatures (before and after the reaction) are recorded. The mass and specific heat capacity of the substances multiplied by the temperature change provide a figure for the amount of energy released or absorbed during the reaction. The enthalpy change of the reaction is calculated by dividing the energy change by the quantity of A that was present.
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Which brain region or part of the brain is responsible for hearing the sounds of a crowd in a baseball game?
Answer:
I think it's the auditory cortex or the temporal lobe
it takes 2.00 l pure oxygen gas at stp to react completely with a certain sample of aluminum. what is the mass of aluminum reacted?
64.6 g of Al2O3 are created from 30.4 g of O2. The highest amount of aluminum oxide that may be produced in this reaction is 57.4 g, with aluminum acting as the limiting reagent.
The mass of an object can be calculated by multiplying its density by its volume because density is a measure of mass per unit of volume. For aluminum products, high pressure die casting is a quick and effective method of mass production. A steel mold is heavily pressurized as molten aluminum is poured into it, producing 1,000 to 1,000,000 pieces of high pressure die casting aluminum annually. Sodium aluminate and water are created when aluminum oxide interacts with sodium hydroxide. The temperature where this reaction occurs is between 900 and 1100 °C.
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1. Given the formula of a substance:
H
HH
NE
C=C-C=C
7
H
H
H
What is the total number of shared electrons in a molecule of this substance?
A) 22
B) 11
C) 9
D) 6
A molecular formula is a chemical formula for a molecular compound that shows the types and numbers of atoms in the compound's molecule. Ammonia is a nitrogen-hydrogen compound.
What is the total number of shared electrons in this substance's molecule?The total number of shared electrons in a molecule is 22.
Ionic and covalent compounds are the two types of compounds. Molecules are the most basic unit of a covalent compound, and they can be represented in a variety of ways.
Atoms are the smallest units of matter that retain an element's fundamental chemical properties. However, much of the study of chemistry is concerned with what happens when atoms combine to form compounds. A compound is a unique collection of atoms held together by chemical bonds.
The electrostatic attraction between the positively charged nucleus and the negatively charged electrons surrounding it holds the structure of the atom together, and the stability within chemical bonds is also due to electrostatic attractions. Consider the two most common types of chemical bonds: covalent bonds and ionic bonds. Two atoms share pairs of electrons in covalent bonds, whereas electrons are fully transferred between two atoms in ionic bonds.
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identify each material as a compound or a mixture. coffee is a solution of organic substances in water. mixture compound
The material as a compound or a mixture. coffee is a solution of organic substances in water is mixture.
Mixture can be defined as the combination of different substances and they can be separate by the different types methods. like salt water , salad is a mixture. coffee comes under the category of solution , a mixture and a homogenous mixture. A homogeneous mixture is defined as the mixture of substances that can be mixed thoroughly that cannot be seen as individual substance.
Thus, The material as a compound or a mixture. coffee is a solution of organic substances in water is mixture.
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Answer:
mixture for both
Explanation:
Name the process that occurs which causes the sugar to spread throughout the water.
The process of that causes the sugar to spread throughout the water is called solvation.
What is solvation?Solvation is the process by which solvent molecules surround and interact with dissolved ions or molecules. It simply refers to the interaction of a solute and a solvent. An important example of solvation is hydration where the solvent is water.
In general, the law of analogy applies to solvation is polar and non-polar nature of solute and solvent:
Polar solutes like sodium chloride are solvated by polar solvents such as water. They are not solvated by non-polar solvents such as benzene.Nonpolar solutes such as icosane are solvated by nonpolar solvents such as benzene. They are not solvated by polar solvents such as water.The soap molecules have polar and non-polar parts. Nonpolar moieties attract nonpolar molecules such as fats, while polar moieties allow them to be solvated by water. This combination of properties makes soapy water the perfect mixture for washing dirty dishes after eating.As sugars are polar solutes, hence they end up dissolved in polar solvents such as water.
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A piece of copper has a volume of 5.00 cm3. The density of copper is 8.96 g/cm3. What is the mass of the copper piece? mass = [ ? ] g Record your answer to the tenths place.
44.8 g is the mass of the copper piece
density= 8.96 g/cm3.
volume=5.00 cm3
density=mass/volume
mass=density × volume
mass= 8.96 g/cm3× 5.00 cm3
mass=44.8 g
The amount of matter that makes up an item is quantified by its mass. The kilogram (kg) is the fundamental unit of mass in the SI, and its initial definition was the mass of one liter of water at room temperature (the volume of a liquid changes slightly with temperature). The only SI base unit with a prefix is the kilogram.
Weight and mass are often used interchangeably. On the moon, the gravitational pull is roughly one-sixth as strong as it is on Earth. The weight of a given object will thus be six times greater on Earth than on the moon. Since mass only depends on the amount of matter in an object, it is location-independent.
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The amount of water flowing through a channel over a given amount of time is called its ______.
Answer:
Discharge
Explanation:
this is the answer
a large rainstorm hits your town and it rains all day. how does this event relate to the water cycle?
When a large rainstorm hits your town and it rains all day, is a stage of water cycle known as precipitation.
What is water cycle?
The water cycle shows the continuous movement of water within the Earth and atmosphere.
There are three main parts to the water cycle and they are listed below:
Evaporation, Condensation PrecipitationThe evaporation of water occurs when the water on earth surface such as lakes, rivers, ocean, etc, gains heat, turn into water vapour and escapes into the atmosphere.
The next stage after evaporation in water cycle is condensation, the warmer water vapour comes in contact with cooler air in the atmosphere or clouds, lose heat and form water droplets which accumulates in the cloud.
The last stage in the water cycle is precipitation; when the condensed water droplets in the cloud saturates the cloud, it precipitates in form of rain fall, and the process continues to infinite.
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After comparing the 20% cranberry juice absorption spectrum to the 20% apple juice absorption spectrum, do you think that apple juice contributes to the color of cranberry-apple juice at the λmax you selected? why or why not?.
Color of apple and cranberry juice is yellow and red respectively as the two colors of juices are different each color has it's own λ max according to Beer's law and hence apple juice contributes to color of cranberry-apple juice .
What is Beer's law?The Beer's law states that the absorbance is directly proportional to the concentration of a solution that is,A∝C .Most substances follow Beer's law from low to moderate temperature ranges only.It is not followed well in case of saturation effects which are present in highly concentrated samples.
Due to the direct relation between absorbance and concentration , absorbance is preferred over transmittance for recording the spectra.
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what process occurs in box a? what process occurs in box a? electron transport and oxidative phosphorylation oxidative phosphorylation electron transport
oxidative phosphorylation occurs in a box ,Carbon dioxide and water are by-products of cellular respiration.
what is oxidative phosphorylation ?
During oxidative phosphorylation, electrons derived from NADH and FADH2 combine with O2, and the energy released from these oxidation/ reduction reactions is used to drive the synthesis of ATP from ADP.Oxidative phosphorylation or electron transport-linked phosphorylation or terminal oxidation is the metabolic pathway in which cells use enzymes to oxidize nutrients, thereby releasing chemical energy in order to produce adenosine triphosphate. In eukaryotes, this takes place inside mitochondriaOxidative Phosphorylation StepsDelivery of Electrons by NADH and FADH2. Reduced NADH and FADH2 transfer their electrons to molecules near the beginning of the transport chain. ...Electron Transport and Proton Pumping. ...Splitting of Oxygen to form Water. ...ATP Synthesis.Oxidative phosphorylation provides most of the ATP that higher animals and plants use to support life and is responsible for setting and maintaining metabolic homeostasis.In the mitochondrion, what the proton gradient does is facilitate the production of ATP from ADP and Pi. This process is known as oxidative phosphorylation, because the phosphorylation of ADP to ATP is dependent on the oxidative reactions occurring in the mitochondriato know more about oxidative phosphorylation follow
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Which of the following is a physical change?
A) density of ice
B) oxidation of rust
C) reactivity with water
D) flammability of propane
The following is a physical change flammability of propane. Option D.
Properties that can be obtained without changing the composition of a substance are called physical properties. A chemical property is a property that can be measured or observed only when a substance changes into a completely different kind of substance. These include reactivity flammability and the ability to rust.
Density is the mass per unit volume of matter. Density is a concentrated property. That is, the density does not change as the amount of matter present changes. Physical properties are properties of matter that are not related to changes in chemical composition. Well-known examples of physical properties are density color hardness melting and boiling points and electrical conductivity.
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I have this chemistry exam tomorrow and im revising but i don’t understand this question
A reaction that has two molecules involved at the rate determining step normally has an overall reaction order equal to?.
The total number of molecules responding in an elementary step determines the reaction's overall order. The reaction in the example below is referred to as first order.
Can there be two rate-determining phases in a reaction?Accordingly, a chemical system must always have either a single rate-controlling step (the RDS) or many rate-controlling steps, as well as potentially one or more rate-inhibiting processes. To sum up: Although not every overall chemical reaction contains a rate-determining step (RDS), all chemical reactions should have at least one.
What does order of reaction mean?Definition. The power dependence of the rate on the concentration of each reactant is referred to as the order of reaction. As a result, the rate of a first-order reaction depends on the concentration of a single species.
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What is the correct lewis electron-dot structure for the compound made of magnesium fluorine after forming an ionic bond?.
In the Lewis structure of MgF₂, each magnesium atom and each fluorine atom has two single bonds. Two fluorine atoms flank the magnesium atom. There are no lone pairs present on magnesium ion however there are three lone pairs on each of the fluorine atoms.
What is lewis electron-dot structure?Each element has a certain number of electrons in its atomic orbitals. Of these electrons, only those involved in bond formation with other atoms are present in the outermost shell of the atom. These electrons in the outermost orbital of the atom are called valence electrons.
MgF₂ is an ionic compound consisting of a magnesium cation and a fluoride anion. To draw the electron dot or Lewis diagram of this compound, you must first draw the electron configuration of the atoms.
Electronic configurations:
Mg : 1s²2s²2p⁶3s²
F : 1s²2s²2p⁵
By donating two electrons, magnesium has a full octet in its outer shell, and fluorine lacks only one electron to complete its octet, so two fluorine atoms bond with magnesium. Forms stable MgF₂ compounds. Thus an ionic bond is formed.
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The amount of energy needed to apply a force of 1 newton over a distance of 1 meter is also called a.
Answer:
Joule
Explanation:
This is the answer
which of the following ions has the same ground-state electron configuration as the nearest noble gas?
group of answer choices
fe3+
pb4+
zn2+
zr2+
ce4+
Answer:
i think it might be zr2+ i may be wrong but lets try that
Explanation:
In the reaction 4al _o2→2al2o3, what coefficient should be placed in front of the o2 to balance the reaction? responses 1 1 2 2 3 3 4
The coefficient 2 should be placed in front of H2O to balance the following reaction: 2H2 +O2 = 2H2O.
The equation is said to be balanced when each element has the same number of atoms on both sides of the equation. The use of coefficients allows for the balancing of chemical equations. To complete the number of atoms, an element is given a coefficient, which is a numerical value.
This is the answer: 2H2 + O2 Equals H2O.
To equalise the proportion of hydrogen and oxygen atoms, we utilise coefficient 2. Coefficient 2 should be placed in front of H2O to balance the following reaction: 2H2 +O2 = 2H2O.
A coefficient is an integer that is either multiplied by or listed next to the variable with which it is linked. In other terms, a coefficient is a term's numerical factor that contains both constants and variables. The coefficient in the phrase 2x, for instance, is 2.
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which of the following molecules contains an aldehyde? group of answer choices ch3coch3 ch3och3 ch3ch2oh ch3cho
The molecule that contains aldehyde group is : CH₃CHO.
An aldehyde is the organic compound containing CHO group at the end. In IUPAC naming the suffix used for the aldehyde group is al.
1) CH₃COCH₃ : This contain c double bond o group that is ketone group.
2) CH₃OCH₃ : The compound compound contain ether group.
3) CH₃CH₂OH : This compound contains the OH group called as alcohol group . the suffix used in alcohol is ol.
4) CH₃CHO : the compound contains CHO group at the end of the chain . this molecule contain aldehyde group.
Thus, The molecule that contains aldehyde group is : CH₃CHO.
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predict the charge that an ion formed from sulfur would have. question 21 options: a) 1- b) 2- c) 6 d) 4 e) 3-
The charge of the ion from the sulfur atom would have 2- ionic state.
Sulfides/sulfur ions are inorganic sulfur anions of the formula S2- or compounds containing one or more S2- ions. Solutions of sulfide salts are corrosive. Sulfides also refer to a large family of chemical compounds, inorganic and organic compounds. Lead sulfide and dimethyl sulfide. Hydrogen sulfide and disulfide are conjugate acids of sulfides.
However, the name sulfide is also used in IUPAC nomenclature for compositions that do not assume the type of bond involved. Examples of such names are selenium disulfide and titanium sulfide, which do not contain sulfide ions.
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carbon, hydrogen, oxygen, nitrogen, phosphorus, and sulfur are considered multiple choice minor elements. major elements. neutral elements. acidic elements.
These elements like carbon, oxygen, nitrogen, etc are called the major elements.
Major elements are those elements that are found more than 1% in the atmosphere. These elements are higher in quantity than the other elements.
These are also known as major elements because they are majorly found in the genetic material of living beings.
It can be said that these are the element by which the living beings are formed. Genetic material like DNA or RNA have these materials and are abundant in the body.
They are also known as CHON elements in short.
Hence, with all that we can conclude that these elements are the major elements.
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what alkane, with molecular formula c5h12 , forms only one monochlorinated product when it is heated with cl2 ?
The alkane with the molecular formula C₅H₁₂ , which forms the only one monochlorinated product when it is heated with Cl₂ is 2,2 dimethyl propane or neo-pentane.
The alkane with the molecular formula C₅H₁₂, forms only one monochlorination product is given as follows :
C(CH₃)₃- CH₃ + Cl₂ -----> C(CH₃)₃- CH₂ - Cl
2,2 dimethyl propane 2,2 dimethyl 1 chloro- propane
( neopentane)
thus, the 2,2 dimethyl 1 chloro- propane is formed when the neopentane or the 2,2 dimethyl propane with undergoes mono chlorination. in the mono chlorination the , in the alkane the one hydrogen atom is replaced by the chlorine atom,. this is the process of chlorination.
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The physical property of a substance that tells us how much energy is required to change the temperature of a substance by 1oc.
The specific heat capacity is the amount of heat required or absorbed to raise the temperature of a given substance by 1°C.
Heat capacityUsually denoted by a capital C, often with a subscription) is a measurable quantity that describes the amount of heat required to raise the temperature of a substance (object) by a certain amount (eg 1°C).
When calculating the amount of heat, what we calculate is the amount of heat transfer. Heat is an energy that moves from objects with a higher temperature to objects with a lower temperature.
The heat capacity formula is as follows,
C = Q : ∆T
C : Heat capacity (joules/°C).
Q : Heat (joules).
∆T : Change in temperature (C).
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How does electron pair repulsion determine the molecular shape/molecule geometry?.
The repulsion of the electron pair surrounding the core atom has a significant impact on the geometry or shape of the electron.
How does the molecule shape indicate or are determined by electron pair repulsion?The tendency of the electron pairs in an atom to repel one another when they are present is known as electron pair repulsion.
The more repulsion there is between the electron pairs, the more the electrons want to organize themselves to lessen it.
Here, the issue of how electron pair repulsion affects molecule geometry is raised.
The fundamental explanation is that the molecule will change its structure to keep the repelling electron pair apart.
The electron pair repulsion also plays a significant role in determining molecular geometry, since molecules prefer to modify their form and geometry in response to the electron pair.
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If 30. 0 l of oxygen gas is cooled from 473 k to 274 k at constant pressure, what is the new volume of oxygen ?.
The new volume of oxygen is 17.378 L.
Charles's law“If a gas is contained in a closed chamber with constant mass and pressure, then its volume is directly proportional to its absolute temperature"
The relationship between volume and absolute temperature in the Charles equation is directly proportional. That is, if the temperature increases, the volume also increases. Conversely, if the temperature decreases, the volume of gas also decreases.
Thus, the simplest Charles law equation can be expressed as:
K = V/T
With,
V = gas volume (m³)
T = absolute temperature (K)
k : constant
So, Charles' law equation can be written as:
V₁/T₁ = V₂/T₂
Where:
V₁ = initial volume of gas = 30 L
T₁ = initial temperature of gas = 473 K
V₂ = new volume of gas = ?
T₂ = new temperature of gas = 274
On putting all these values on the above equation, we get
V₂ = (30)(274) / 473 = 17.378 L
So, the new volume of oxygen is 17.378 L.
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what force was applied to an object if 35 j of work was done and the object moved 7 m?
5N force was applied to an object if 35 j of work was done and the object moved 7 m
A force is an effect that can alter an object motion according to physics and an object with mass can change its velocity or accelerate as a result force and also force is as push or pull and work done by the force on an object means assuming that direction of the force is parallel to the displacement of the object
Then the formula is
W = f × d
Where f is the magnitude of force and d is the displacement of the object
Then W = 35 J is the work done and
d = 7m is the displacement of the object
So rearrange the equation then
F = 35/7 = 5N
5N force was applied to an object if 35 j of work was done and the object moved 7 m
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if a solution has a very low concentration of h , it will have a ph in what range? group of answer choices
If a solution has a very low concentration of H⁺ , The pH in of the solution increases.
The pH is inversely proportional to the concentration of H⁺ ion. the strong acid is one which produces more H⁺ ion in the solution. the weak acid produce less concentration of H⁺ ion. if the concentration of H⁺ ion decreases the pH of the solution increases. the pH below 7 is acidic and pH above 7 is basic. the pH increase mean solution shifts to basicity.
Thus, If a solution has a very low concentration of H⁺ , The pH in of the solution increases.
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7. The tendency of sound waves to bend when they pass from one medium to a different medium is known as A. refraction C. resonance B. reflection D. interference
The tendency of sound waves to bend when they pass from one medium to a different medium is known a refraction.
What is refraction ?In diffraction, a sound wave is bent or stretched out in a single medium where the sound speed remains constant. Refraction is a crucial instance in which sound waves arc or diffuse. Due to variations in the wave's speed, a sound wave bends in this occurrence.
A wave bends as it travels along the edge of an object or through an aperture. It is referred to as diffraction. When a wave transitions from one medium to another at an angle, it also bends. It's known as refraction.
Thus, The option A is correct.
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based on the tests in this lab, what anion is most likely present if you add acid to a solution and then bubbles form vigorously?
HCO₃⁻ is most likely present if you add acid to a solution and then bubbles form vigorously.
Define bicarbonate (HCO₃)?The body uses bicarbonate, an electrolyte and negatively charged ion, to assist keep its acid-base (pH) balance. In order to maintain electrical neutrality at the cellular level, it also collaborates with the other electrolytes (sodium, potassium, and chloride). This examination examines the total concentration of blood carbon dioxide (CO₂), which primarily takes the form of bicarbonate (HCO₃⁻). The majority of the CO₂is a byproduct of many metabolic activities.
The main organs responsible for controlling blood pH by eliminating extra bicarbonate are the lungs and kidneys.
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