To solve this we must be knowing each and every concept related to mole and and its calculations. Therefore, 388.15g is the mass of 3.5 moles of CaCl[tex]_2[/tex].
What is mole?A mole is merely a measuring unit. In reality, it is one of International System of Units' seven foundation units (SI). When basically determines are insufficient, new units are created.
Chemical reactions frequently occur at levels that use grams would be inappropriate, but using actual figures of atoms/molecules/ions would also be misleading.
It's much easier to write' mole' than '6.02x10²³' whenever you wish to refer to a huge number of things. That is essentially why and how this particular component was created.
mole =given mass ÷ molar mass
moles of CaCl[tex]_2[/tex] = 3.5 moles
Molar mass of CaCl[tex]_2[/tex] =110.9g/mol
mass of CaCl[tex]_2[/tex] =3.5 moles × 110.9g/mol
=388.15g
Therefore, 388.15g is the mass of 3.5 moles of CaCl[tex]_2[/tex].
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What is the major attractive force that exists among different I2 molecules in the solid? Select one: A. covalent-ionic interactions. B. Dispersion forces. C.
The claim that sense neurons' cell bodies are located in the grey commissure, an expanded region of the dorsal root.
Dorsal nerve roots provide sensory neural signals to the central nervous system from the peripheral nervous system. Anatomically, a dorsal root ganglion develops from the dorsal root of the spinal nerves. For the central nervous system to react, they transmit sensory data from multiple peripheral receptors. It is generally recognised that DRG has a role in chronic pain. The first description of anaesthesia infiltration of the DRG was made in 1949. It has been possible to target the DRG using the dorsal root entry zone (DREZ), a nearby related neural target, dorsal rhizotomy or gangliectomy, conventional radiofrequency denervation, pulsed radiofrequency, and steroid injection.
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In the activity series, the more active elements are found
(a) at the bottom
(b) in the middle
(c) at the top
(d) both (a) and (c)
In the activity series, the more active elements are found at the bottom and at the top. Option d.
The activity series is a way of organizing elements according to their reactivity.
The elements found at the bottom of the series are the most active, and those found at the top are the least active.
Knowing the activity series can help us predict how a reaction will proceed, and can be a useful tool when determining which compounds are most likely to form in a given reaction.
The elements at the bottom of the activity series are the most active, and the elements at the top are the least active. Knowing the activity of elements can help you understand the chemical properties of different materials and how they may interact with each other.
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The positively charged center in an atom is called as:A. NucleusB. NeutronsC. ProtonsD. Electrons
The positively charged center in an atom is called as Nucleus. It is made up of positively charged protons and neutral sub-atomic particle called as neutrons.
What is meant by protons ?
Every atom has a proton, a subatomic particle, in its nucleus.The particle possesses an electrical charge that is positive and opposite to the electron's.A subatomic particle with a negative charge is an electron. A subatomic particle having a positive charge is called a proton.The strong nuclear force holds protons together in the nucleus of an atom. A particular subatomic particle with no charge is the neutron.Although protons were once thought of as elementary particles, the Standard Model of particle physics now recognizes them as composite particles made up of three valence quarks, and they are grouped alongside neutrons as hadrons.To learn more about protons refer to
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help mi plssneed it now
The molar mass of a material is its mass expressed in grams per mole of the chemical.
What is meant by molar mass?The ratio between a sample's mass and its substance content is known as the molar mass of a chemical compound in chemistry. A substance's molar mass is a bulk attribute rather than a molecular one.
A substance's molar mass is its mass in grams per mole of the chemical. A mole is the measurement of the quantity of atoms, molecules, or ions in a substance.
You may determine the mass of 1 mole of a compound by looking at its molar mass. In other words, it provides the amount of grams in a substance per mole. As a result, molar mass is measured in grams/mole.
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What is hydropower development?.
Answer:
Hydropower technologies generate power by using the elevation difference, created by a dam or diversion structure, of water flowing in on one side and out, far below, on the other.
the questiojn is need answere please
The one case that the surroundings do work on the system is q = -17 KJ, w = + 58 kJ. The correct option is A.
What is work done in a system?As work is negative, it indicates that the system is doing the work because when the system works, energy is expended and volume rises.
If the work is constructive, the system is being worked on because it is absorbing energy and its volume is decreasing.
Work = Force Distance is the formula for calculating work. The joule (J), sometimes known as the Newton meter (N m), is the SI unit for work.
Therefore, the correct option is A. q = -17 KJ, w = + 58 kJ.
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How many grams are in 2. 0 moles of H2O?.
Answer:
36g
Explanation:
H2 = 2
O = 16
18 = Mr of H2O
mass = moles x Mr
mass = 2 x 18
mass = 36g
What is the boiling point, in °C,
of a 0.743 molal aqueous
solution of KCL?
BP(water) = 100 °C
Kb (water) = 0.512 °C/m
[?] °C
The boiling point in °C, of a 0.743 molal aqueous solution of KCL is 100.761 ∘ C
What is the boiling point, in °C?Δ T b≡ T b − T * b = I K b m ,
where:
The difference between the solution's boiling point, T b, and the pure solvent's boiling point, T * b, in degrees Celsius, is known as T b.
The van't Hoff factor, or the actual number of solute particles in solution, is denoted by the letter i.
The water boiling point elevation constant is K b = 0.512 C/m.
mol solute/kg solvent is the solution's molality, or m. Does the solute have a high or low volatility?
Considering complete dissociation.
KCl ( a q ) → K + ( q ) + Cl − ( a q )
Additionally, 1+1=2i, thus...
T b = T * b + i K b m
= 100 ∘ C + 2 ⋅ 0.512 ∘ C/m ⋅ 0.743 m
= 100.761 ∘ C
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In an experiment searching for the photoelectric effect, an incident beam of green light produced no ejected electrons from a metal. In order to eject electrons, the experimenter should?
A. increase the brightness of the light.
B. try blue light.
C. try yellow light.
D. give up on that particular metal.
E. decrease the brightness of the light.
To remove electrons in the photoelectric experiment, experimenters must try blue light. (B)
Definition of PhotoelectricThe photoelectric effect occurs when one of the metal plates is exposed to light, there is a current going to the other metal plate, as has been detected by the ammeter in the circuit above.
The ability of light to move electrons depends on its frequency. So if for example the light intensity is small but the frequency is large, the electrons will still be able to escape.
The energy that causes this movement of electrons is from the electromagnetic waves of light.
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what is a test variable and a outcome variable
pls help me
The test variable is manipulated while the outcome variable is observed.
What is a variable?When we use the term variable, our minds would have to go to something that has the ability to change. As such, when we are carrying out an experiment there is the variable that we manipulate and this would lead to a change in another variable.
The variable that we are able to manipulate as we are carrying out the experiment is what we call the test variable while the one that is changed due to this manipulation is called the out come variable.
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The radius of a barium atom is 217
pm. How many barium atoms would
have to be laid side by side to span a distance of 2.60 mm?
12,005 barium atoms would have to be laid side by side to span a distance of 2.60 mm
What is barium atoms?Barium can be defined as a chemical element with the symbol Ba and atomic number 56.
To find the number of barium atoms that would have to be laid side by side to span a distance of 2.60 mm.
we need to divide the distance by the radius of one barium atom:
2.60 mm / 217 pm = 12,005
Therefore, 12,005 barium atoms would have to be laid side by side to span a distance of 2.60 mm.
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Why do we not just calibrate the gas thermometer at absolute zero? - Waiting for equilibrium at absolute zero would take much more time than is available - Measuring absolute zero requires liquid deuterium for coolant which is expensive - Absolute zero cannot practically be produced in any lab setting - Condensation of water vapor in the lab would raise the temperature
We do not just calibrate the gas thermometer at absolute zero because absolute zero cannot practically produced in o any lab setting.
Reason -
In order to cool a substance to absolute zero (-243-15°C), an unlimited amount of work would be required to remove the heat from it. Therefore, it is essentially impossible to create an environment with an absolute zero temperature.
Because absolute zero cannot effectively be manufactured in any lab setting, we cannot calibrate our thermometer at that temperature due to letter C. Since we cannot create absolute zero,
a thermodynamic system has its lowest energy at absolute zero degrees Celsius. It is equivalent to 459.67 degrees Fahrenheit and 273.15 degrees Celsius, respectively, on the thermometer.
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geologists attempting to locate metallic mineral resources such as copper and iron will first consider the ____ of the rock and how it formed.
Minerals can be located using geochemical surveys and remote sensors that analyze satellite images. Following that, mining or quarrying is used to remove many minerals.
What do you do to find mineral resources first?Search for Potential Deposits, Locating areas that are likely to contain mineral deposits is one of the first steps in the exploration process. Prospective areas might be close to other known mineralization areas or to active mine sites because mineral deposits frequently form in clusters.Minerals can be located using geochemical surveys and remote sensors that analyze satellite images. Following that, mining or quarrying is used to remove many minerals. Pumping, however, can be used to extract liquid minerals like oil or gas.When choosing which deposit to pursue, some factors include the deposit's location and shape, the rock's strength, the grade of the ore, the costs associated with mining it, and the commodity's current market price.To learn more about minerals refer to:
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Margarita decides to enter her school's science fair. She has always loved flowers and wants to incorporate them into her
project. In the end, Margarita decides to test the effectiveness of different types of plant food (fertilizer) on a certain type of
rose bush. Her goal is to determine which fertilizer produces the tallest rose bushes with the greatest number of flowers.
Describe how Margarita might set up her experiment. Discuss the actions Margarita should take to get reliable data.
Answer: Statistics is the best way for Margarita to organize, interpret, and present her data.
Explanation:
Help me Please!!!!!!!!
In order to heat 7.40g of water to a higher temperature, 526.35 joules of heat energy are needed.
How is heat energy measured and calculated?Q = m•C•ΔT, Where Q is the amount of heat that is transported to or from the item, m is the object's mass, C is the material's specific heat capacity, and T is the change in temperature that results as a result.
7.40g of water needs 526.35 joules of heat energy to reach the desired temperature.
According to the following formula, the amount of energy is expressed:
The specific heat of water is 4.184 J/g0C and its mass is 7.40 grams.
In the formula, replace the specified parameters with:
In order to heat 7.40g of water to a higher temperature, 526.35 joules of heat energy are needed.
In order to heat 7.40g of water to a higher temperature, 526.35 joules of heat energy are needed.
The complete question is,
The temperature of 7.40g of water must be raised from 29.0 OC to 46.0 OC. Calculate the joules of heat energy needed to do so. 4.184 J/gOC for water's specific heat.
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The 400.0g of water requires 526.35 joules of heat energy.
What is heat energy?The formula,
Q = m•C•T, where Q is the amount of heat transported to or from the item, m is the mass of the object, C is the specific heat capacity of the material, and T is the temperature change as a result.
To reach the desired temperature, 400.0g of water requires 526.35 joules of heat energy.
The amount of energy is expressed using the following formula:
Water has a specific heat of 0.664 J/g0C and a mass of 400.0 grams.
Replace the specified parameters in the formula with:
526.35 joules of heat energy are required to heat 400.0 g of water to a higher temperature.
526.35 joules of heat energy are required to heat 400.0g of water to a higher temperature.
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Is dissolving a chemical change or physical change?
Dissolving a substance is considered a physical change.
When a substance dissolves in a solvent, the particles of the substance are dispersed throughout the solvent and become evenly distributed, but the chemical composition of the substance does not change. The dissolved substance retains its chemical properties and can be separated from the solvent by physical means such as evaporation or distillation.
A chemical change, on the other hand, involves a change in the chemical composition or properties of a substance. It typically involves the formation of new substances, the breaking or making of chemical bonds, and the release or absorption of energy. Examples of chemical changes include combustion, rusting, and acid-base neutralization.
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chemically, the three layers of the Earth's interior, stated in order from center to surface, are the(1)
The three layers of the Earth's interior, stated in order from center to surface, are the core, mantle and the crust.
What is Earth?
Earth is the planet we live on, one of eight planets in our solar system and the only known place in the universe to support life. Earth is the third planet from the sun, after Mercury and Venus and before Mars. It is about 150 million kilometers (about 93 million miles) from the sun. This distance, called an astronomical unit (AU), is a standard unit of measurement in astronomy. Earth is one AU from the sun.
The planet Jupiter is about 5.2 AU from the sun—about 778 million kilometers (483.5 million miles). Earth is the largest and most massive of the rocky inner planets, although it is dwarfed by the gas giants beyond the Asteroid Belt.
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how do silica tetrahedra bond in silicate minerals?
Quartz silica tetrahedra (SiO2) are linked in a "perfect" three-dimensional framework. Each tetrahedron is connected to four other tetrahedra (with one oxygen shared at each corner),
The silicon-to-oxygen ratio is one-to-one. The silicon atom's outer shell includes four electrons. Each of the four electrons in the silica tetrahedra is shared with one of the four oxygen atoms that are linked. In turn, each oxygen atom shares one of the six electrons in its outer shell. Two single chains of silica tetrahedra join together by sharing the third oxygen in alternating tetrahedra to produce an atomic structure. A kind of silicate mineral in which silica tetrahedra are arranged hexagonally. The quartz silica tetrahedra (SiO2) are connected in a "perfect" arrangement. Framework in three dimensions. Each tetrahedron is connected to four other tetrahedra (with one oxygen shared at each corner),
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PLEASE HELP ASAP!!!!
ANSWERS FOR THE LAST PHOTO
W
X
Y
Z
An atom is made up of three subatomic particles namely; protons, neutrons and electrons.
The proton is the positively charged particle in the nucleus of the atom while the electron is the negatively charged particle surrounding the nucleus.
The number of neutrons can be calculated by subtracting the atomic number of the element from the mass number.
In question 1 of the above image, no of neutrons = 39 - 19 = 20 neutronsIn question 2, no of neutrons = 207 - 82 = 125 neutronsLearn more about neutrons at: https://brainly.com/question/28992636
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What are valence electrons
Answer:
Valence electrons are electrons located in the outermost energy level (Responsible for bonding.)
Explanation:
Hope this helps :)
which elements are most likely to react in the same manner in a chemical reaction?
The elements most likely to react in the same manner in a chemical reaction are those that are in the same group. It because of the same number of valence electrons.
The elements in the same group are most likely to react in the same manner in a chemical reaction. It is because their outer shells have the same number of valence electrons. In fact, the electrons are the component of an atom that is involved in reactions. Meanwhile, the protons and neutrons in an atom's nucleus are not involved in reactions.
For example:
Elements in the Group 1 (Alkali metals) contains Li, Na, K, Rb, Cs, and Fr.- They all have one valence electron, which they easily lose when forming ions.
- They are easily reacted with water
- They possess low melting points and densities
- They are good electrical conductors.
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How many Br- ions are present in 1.00 moles of FeBr3? a. 1.81E24 b. 6.02E23 c. 6.02E25 d. 12.04E23
B) The number of Br- ions present in 1.00 moles of FeBr3 is 6.02E23.
To find the number of Br- ions present in 1.00 moles of FeBr3, we need to first determine the number of moles of Br- ions present in the compound. FeBr3 is a compound that contains 1 Br- ion per formula unit.
To find the number of moles, we can use the formula:
moles = number of atoms / Avogadro's number (6.02E23)
The number of moles of Br- ions in 1.00 moles of FeBr3 is:
1.00 moles x (1 Br- ion / 1 formula unit) = 1.00 moles
So, the number of Br- ions present in 1.00 moles of FeBr3 is 6.02E23 ions.
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how many chlorine atoms are in the compound fe2cl3
There are three chlorine atoms in each FeCl3 molecule. In terms of the total number of atoms in the molecule ferric chloride, there are four. chlorine atoms are in the compound fe2cl3.
Chlorine atoms molecules are made up of two atoms (Cl2). Except for the lighter noble gases, chlorine interacts with practically all elements to form chlorides; those of most metals are ionic crystals, whilst those of semimetals and nonmetals are mostly molecular. Chlorine has an atomic mass of 35.45 and an atomic number of 17, implying that one atom of chlorine has 17 protons, 17 electrons, and 18 neutrons. Chlorine, being a member of the Periodic Table's halogen family, is particularly reactive with metals and creates salts. When the element chlorine (a halogen) obtains an electron or when a molecule such as hydrogen chloride is dissolved in water or other polar solvents, it is produced. Sodium chloride and other chloride salts are frequently extremely soluble.
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AE=mcAT
AT=(Tr-T)
c=Specific Heat
AE= Heat Energy / Heat Gain or Loss
The specific heat of water is 4.2 J/g°C. If you have 10 g of what how much energy has to be lost to lower the
temperature from 25°C to 10°C?
-49.2 J
O-630 J
1 point
-1,470 J
O-10,500 J
Δt = 25°C - 10°C = 15°C
c = 4.2 J g^-1 °C^-1
m = 10 g
Heat energy required
= mcΔt
= 10×4.2×15
= 630 Joules
draw the structure of the organic product or products formed in the reaction.
H2C=CH-CH=CH-CH2-Mg-Br + D2O------ H2C=CH-CH=CH-CH2-D + DO- Mg-Br, H2C=CH-CH=CH-CH2-Mg- Br is Grignard reagent , it is highly polar in nature so it is highly reactive.
mecanism
H2C=CH-CH=CH-CH2-Mg- Br is Grignard reagent , it is highly polar in nature so it is highly reactive .
H2C=CH-CH=CH -CH2-Mg-Br------ H2C=CH-CH=CH -CH2- + Mg+-Br
H2C=CH-CH=CH -CH2- that intermediate show resonance so become more product.
H2C=CH-CH=CH -CH2- <-----> H2C=CH-CH--CH=CH2 <-----> -CH2-CH=CH-CH=CH2
So two product possible
D2O----- OD- + D+
product1- H2C=CH-CH=CH2 -CH2- + D+---- .H2C=CH-CH=CH-CH2-D major product
product2- H2C=CH-CH--CH=CH2 + D+----- H2C=CH-CHD-CH=CH2
step-2 Mg+-Br + OD----- DO- Mg-Br
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The complete question is:
draw the structure of the organic product or products formed in the reaction.
How many molecules are the in 1.8g of water molecules
Answer:
6.022 x [tex]10^{22}[/tex] molecules
Explanation:
One mole of any substance has 6.022x [tex]10^{23}[/tex] particles.
Mr of water: 16 + 2 = 18 g
moles of water given: 1.8/18 = 0.1 moles
Using ratio:
moles : molecules
1 : 6.022x [tex]10^{23}[/tex]
0.1 : X
X = 0.1 x (6.022x [tex]10^{23}[/tex] )
X = 6.022 x [tex]10^{22}[/tex]
if gold’s density is 19.32 g/mL, how much would a 0.0333L sample weigh in grams?
A 0.0333-liter sample of gold would weigh 0.64326 grams.
This is calculated by multiplying the density of gold by the volume of the sample.
the density of gold = 19.32g/ml
the volume of the sample = 0.0333 L
sample weight = the density of gold × the volume of the sample
which is 19.32g/ml × 0.0333 L = 0.64326
In chemistry, density is a measure of the mass of a substance per unit of volume. It is typically represented by the Greek symbol "rho" (ρ) and is typically measured in units of grams per milliliter (g/mL) or grams per cubic centimeter (g/cm^3). A substance's density can be calculated by dividing its mass by its volume.
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.
if the proton would not hit one of the plates, what would be the magnitude of its vertical displacement as it exits the region between the plates?
The magnitude of vertical displacement is 2.73×10−6m as it exits the region between the plates.
The electron narrowly escapes impacting the top plate as it travels between the charged plates and feels an upward pull.
Due to its slower acceleration and higher mass, the proton won't hit any plates.
To calculate the vertical displacement as the object exits the plates, we once more use the kinematic equations.
The electron feels a force upward as it passes between the charged plates and narrowly avoids striking the top plate. It just misses the to plate by a small amount as it moves higher.
The distance it travels in the y-direction is 0.005m.
Time of flight is t=0.0200m1.60×106ms−1 =1.25zz10−8s
the initial y-velocity is zero.
so, 0.005m=12a(1.25×10−8s)2
or, a=6.40×1013ms−2
But also a=Fm= eEme
E= (9.1×10−31kg)(6.40×1013ms−2)1.60×10−19C =364NC−1
The proton will accelerate less and miss the plates since it is more massive. We once more utilise the kinematic equation to determine the vertical displacement when it occurs for the plates.
y=12at2=12eEmp(1.25×10−8s) =2.73×10−6m
The proton won't collide with a plate because, despite the fact that the electric force felt by the proton and electrons is identical, the electric force produces a smaller acceleration that is significantly greater than g, making it plausible to disregard gravity.
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Complete question is:
If the proton would not hit one of the plates, what would be the magnitude of its vertical displacement as it exits the region between the plates?
An atom is neutral. Its nucleus contains two protons and two neutrons. How many electrons does the atom have?
A. Three
B. Four
C. Two
D. Zero
Answer:
C Two
Explanation:
no of proton = no of electron
The actual volume of molecules of gas is negligible as compared to the total volume of gas since:
a A large volume is occupied by empty spaces
b A fewer number of molecules are present
c Both A and B
d None of the above
The actual volume of molecules of gas is negligible as compared to the total volume of gas since C. Both A and B.
The Ideal Gas LawThe actual volume of molecules of gas is negligible as compared to the total volume of gas because the majority of the gas is made up of empty spaces. The gas is composed of discrete particles, or molecules, that are separated by a tremendous amount of empty space, and the number of molecules present is incredibly small compared to the total volume of the gas. When a gas is confined to a container, the number of molecules within the container is fixed, and the volume of the container is also fixed. However, the spacing between the molecules is not fixed and can be manipulated. Since the total volume of the container remains the same, but the spacing between the molecules can be changed, the actual volume of molecules present is negligible as compared to the total volume of the gas.This phenomenon is known as the Ideal Gas Law, and it states that the pressure of a confined gas is directly proportional to its temperature and inversely proportional to its volume. The greater the temperature, the more energy the molecules have and, consequently, the closer they are to each other. This means that the actual volume of molecules present is much smaller than the total volume of the gas.Therefore, the actual volume of molecules of gas is negligible as compared to the total volume of gas because the majority of the gas is made up of empty spaces and the number of molecules present is much smaller than the total volume of the gas.
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