Which type of magnet is used to turn motors on and off?
Responses
temporary
permanent
electromagnet
natural
Answer:
Electromagnet
Explanation:
The motorcycle relies on energy to keep it going on and the energy it needs comes from that. :)
which statement provides an accurate description of plastic?
" It is a synthetic substance made with natural materials."
Plastics are high molecular mass organic polymers that frequently incorporate additional materials.
Typically, they are synthetic and come from petrochemicals.
Plastics are produced from natural resources including coal, natural gas, salt, and crude oil through the polymerization process.
The process of joining monomer molecules in a chemical reaction to create polymer chains or three-dimensional networks is known as polymerization, in the field of polymer chemistry.
These monomers combine to create a lengthy chain that gives rise to a final product with particular features. Polymerization refers to the entire process of a polymer being created. Polymers include things like polythene and nylon 66.
Thus, we can define plastics as synthetic materials produced from natural resources.
Plastics are therefore a synthetic material made from natural materials.
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How would I find the the concentration of acetic acid in my vinegar sample using the average volume and concentration of sodium hydroxide, and the volume of vinegar, I have?
Average Volume Sodium Hydroxide: 0.0225L
Concentration of Sodium Hydroxide: 0.250 mol dm-3
Volume of Vinegar: 0.0100 Litres
Explanation:
from
c1v1=c2v2
c1=?
c2=0.250
v1=0.0225
V2=0.0100
c1×0.0225=0.250×0.0100
0.0225c1=0.0025
0.0225c1/0.0225=0.0025/0.225
c1=0.1111
In what ways are the electronic structures of the group 14 (4A) elements similar? In what ways are they different?
Answer:
The electron structures of the group 14 (4A) elements are similar in that they are all part of the carbon group. Thus, they each have 4 electrons in their valence shell. Also, most of these elements are found in our daily lives except germanium. They are different in that their properties differ greatly despite them being somewhat alike.
Explanation:
I hope this helps! I took this class last year.
Think about the animals in an arctic ecosystem. How would those animals adapt over time if global temperatures rise over the next several hundred years?
Given the fact that we are seeing a rise in the temperature of the globe, the artic animals in that ecosystem must adapt by a reduction in the rate of metabolism.
What is global warming?Several evidences continue to emerge that the temperature of the earth have continued to increase and this is largely due to the fact that since the turn of the twentieth century and the rise of industrialization, there have been a rise in the emission of the carbon dioxide and other green house gases into the environment. As a result of this, the temperature of the earth has continued to rise steadily leading to the melting of the ice cover and the destruction of ecosystems that are found around the artic regions of the earth.
Now, we know that an organism is able to adapt to the changes that occur in its habitat by being able to alter some of its structure and function.
Given that the organisms that live in the artic are adapted to cold regions and low temperatures, the metabolic rate of the organisms is high in order to produce heat.
As a result of the rise in global temperatures, the organisms would have to reduce their rate of metabolism.
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What is the pH of a 1.4 *10^-4 M solution of KOH?
What is the hydronium ion concentration of the solution?
M
The pH of KOH is 10.14 and the hydronium ion concentration of the solution is 3.9 × [tex]10^{-5}[/tex] M .
The pH and the hydronium ion concentration of the solution of KOH is calculated as ,
The pOH = - ㏒ [ [tex]OH^{-}[/tex] ]
Given , concentration of hydroxide ion = 1.4 × [tex]10^{-4}[/tex] M
So put the value of concentration of hydroxide ion in equation 1
pOH = - ㏒ 1.4 × [tex]10^{-4}[/tex] M
pOH = 3.85
pH + pOH = 14
pH = = 14 - pOH = 14 - 3.85 = 10.14
pH = - ㏒ [ [tex]H^{+}[/tex] ] = 10.14
[ [tex]H^{+}[/tex] ] = 3.9 × [tex]10^{-5}[/tex] M
Therefore , the pH of 1.4 × [tex]10^{-4}[/tex] M solution of KOH is 10.14 .
Therefore , the hydronium ion concentration of the solution is 3.9 × [tex]10^{-5}[/tex] M .
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how do two sublevels of the same principal energy level differ from each other?
Two sublevels of the same principal energy level differ from each other through shape and size.
There are mainly 4 energy level s, p, d and f.
The s level has one orbital and one orbital have two electrons. So the maximum number of electron in s sublevel is 2.
The p level has three orbital and one orbital have two electrons. So the maximum number of electron in s sublevel is 6.
The d level has five orbital and one orbital have two electrons. So the maximum number of electron in s sublevel is 10.
The f level has 7 orbital and one orbital have two electrons. So the maximum number of electron in s sublevel is 14.
They may be differ in magnetic level.
Thus, we concluded that Two sublevels of the same principal energy level differ from each other through shape and size.
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The two
stages of photosynthesis in plants showing their chemical reactions
Answer:
absorption of light and Carbon Fixation
Explanation:
which of the following is not a part of the ideas john dalton proposed in his model
The following which is not a part of Dalton atomic theory is the properties of atoms of the same elements can be different . Thus option B is correct.
What is Dalton atomic theory?Dalton has proposed his theory in three parts and each part stated that
The first portion of his theory asserts that all stuff is made up of indivisible atoms.
According to the second section of the theory, all atoms of a given element have the same mass and characteristics.
Compounds, according to the third section, are combinations of two or more different types of atoms.
Dalton has given three laws
Law of conservation of massLaw of definite proportionLaw of multiple proportionThus, the following which is not a part of Dalton atomic theory is the properties of atoms of the same elements can be different . Thus option B is correct.
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Your question is incomplete, but your complete question was
which of the following is not a part of the ideas john dalton proposed in his model
A. All matter is composed of indivisible atoms.
B. The properties of atoms of the same element can be different.
C. Compounds form when atoms combine in whole number ratios.
D. An atom can neither be created nor destroyed.
a sample of iron absorbs 0.0810 kj of heat, upon which the temperature of the sample increases from 19.7°c to 28.2°c. if the specific heat of iron is 0.450 j/g·k, what is the mass (in g) of the sample?
The mass of the heat and tempreture will be "12.33 g".
what is heat and tempreture?
The energy is transmitted from one object to the next as a consequence of something like a temperature differential.
The heat has been affected by elements such as particle speed, physical properties, as well as particle quantity, among others.
As per the question
Heat, ΔH = 81.0 J
Specific heat, C = 0.450 J/g°C
Temperature, ΔT = 32.5 - 17.9
= 14.6°C
Enthalpy change of a process -
→ ΔH = m × C × ΔT
By substituting the values, we are getting
81.0 = m × 0.450 × 14.6
m = 12.33 g
So this answer is correct.
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a 5.416 sample that contained nacl and bacl2 * 2h2o was heated. after heating the sample has a weight of 4.911g. what is the percent nacl in the sample.
36.78% (percent) of NaCl is present in the original sample mixture of NaCl and [tex]BaCl_2.2H_2O[/tex].
Given:
Original mass of sample mixture containing NaCl and [tex]BaCl_2.2H_2O[/tex] = 5.416g
After heating, the mass of the sample = 4.911g
To find:
Percent of NaCl in the sample = ?
Formula:
Percent of NaCl in the sample = (Mass of NaCl / Mass of original sample) x 100
Calculations:
Mass of water = 5.416 - 4.911 = 0.505g
Molar mass of [tex]BaCl_2[/tex] = 208.23g/mol
From the chemical formula - [tex]BaCl_2.2H_2O[/tex],
2 mols of [tex]H_2O[/tex] is attached with 1 mole of [tex]BaCl_2[/tex]
Therefore, with 208.23g of [tex]BaCl_2[/tex] , 36.03g of [tex]H_2O[/tex] is attached.
Therefore, 0.505g of [tex]H_2O[/tex] is attached with:
(208.23 / 36.03) x 0.505g of [tex]BaCl_2[/tex].
= 2.919g of [tex]BaCl_2[/tex]
Thus, Mass of NaCl in the original sample mixture = 4.911 - 2.919 = 1.992g
Percent of NaCl in the sample mixture = (1.992 / 5.416) x 100
Percent of NaCl in the sample mixture = 36.78 %
Result:
The percent of NaCl in the original sample mixture is 36.78%
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23.5 g of sodium chloride convert to mole and explain
If you look at the molar mass of sodium on the periodic table, it is 22.99 grams/mole. If you look at the molar mass of chlorine on the periodic table, it is 35.45 grams/mole.
To find the molar mass of sodium chloride, we add these two values and that gets us 58.44 grams/mole.
Alright, so we know that 1 mole of NaCl is equal to 58.44 grams, so how many moles would 23.5 grams of NaCl be?
Now we just divide 23.5/58.44 and you get 0.40 moles of NaCl. (If you're confused on what value to put in the numerator, always put the value that you're interested in converting or calculating for.)
Answer: 0.40 moles
6. A 100 mg sample of a compound containing C, H and O is analyzed. All the carbon is converted
to CO₂ with a mass of 176 mg of CO₂. All of the hydrogen is converted to H₂O with a mass of
36mg. Determine the empirical formula of the compound. What is the molecular formula if
there are 8 carbon atoms per molecule? What is the molar mass?
Answer: L
Explanation:
Help!! Find the approximate pressure of 2 moles of helium in a 0.3
m3 container at 300 K
A. 2000 Pa
B. 17000 Pa
C. 1500 Pa
D. 370 Pa
The approximate pressure of 2 moles of helium in a 0.3m³ container at 300 K is 17000 Pa (option B).
How to calculate pressure of a gas?The pressure of a gas can be calculated using the following formula;
PV = nRT
Where;
P = pressureV = volumen = number of molesR = gas law constant = 0.0821 atm•L/mol•K T = temperatureAccording to this question, 2 moles of helium in a 0.3m³ container is at 300K. The pressure can be calculated as follows:
P × 300 = 2 × 0.0821 × 300
300P = 49.26
P = 0.164 atm
This pressure value in Pascals is 16617.3, which is approximately 17000 Pascals.
Therefore, the pressure of a 2 moles of gas is 17,000 Pascals.
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determine the limiting reactant and calculate the number of grams of sulfur dioxide, so2, that can be formed when 27.3 g of methane thiol, ch3sh, reacts with 38.6 g of oxygen, o2. ch3sh(g) 3 o2(g) → 2 h2o(g) co2(g) so2(g)
As a result of the reaction between oxygen and methanethiol (CH_3SH), 25.8 grams of sulfur dioxide (SO_2) are produced, and the limiting reactant is oxygen (O2).
This is further explained below.
What is a chemical reaction?A process that results in the change of one set of chemical substances into another set of chemical substances is referred to as a chemical reaction.
Generally, the equation for the chemical reaction is mathematically given as
[tex]\mathrm{CH}_3 \mathrm{SH}(g)+3 \mathrm{O}_2(g)+2 \mathrm{H}_2 \mathrm{O}(g)+\mathrm{CO}_2(g)+\mathrm{SO}_2(g)[/tex]
[tex]Number \ of \ moles = \frac{ Given \ mass}{Molecular \ mass}[/tex]
moles of methanethiol=[tex]\frac{27.3}{48.11}[/tex]
moles of methanethiol=0.56moles
moles of oxygen [tex]= \frac{32.01}{38.6}[/tex]
moles of oxygen [tex]= 0.82 moles[/tex]
Considering the response,
When one mole of CH_3SH interacts with three moles of O_2, one mole of SO_2 is produced.
As a result, 0.56 moles of CH_3SH undergo a reaction, which results in 0.56 moles of SO_2 being produced.
0.56 grams of SO_2 are created, which is equal to 35.86 grams.
moles of SO₂ [tex]= \frac{35.86}{ 64.06}[/tex]
moles of SO₂ = 0.55 moles
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How is continental crust different from oceanic crust?
a Continental crust is more dense and contains a lot of basalt.
b Oceanic crust is thinner and younger.
c Continental crust is thinner and younger.
d Oceanic crust is thicker and contains a lot of granite.
The way that continental crust different from oceanic crust is that option B: Oceanic crust is thinner and younger.
Is oceanic crust younger or older?Oceanic crust is much, much younger than continental crust, mostly as a result of subduction. The Ionian Sea, which is a component of the eastern Mediterranean basin, contains or has the oldest known oceanic crust.
Therefore, Oceanic crust differs from continental crust in a number of respects, including thickness, as well as density, age, and also that of chemical make-up. However, in subduction zones, oceanic crust is likewise destroyed.
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select all statements that correctly describe formal charge. multiple select question. formal charges represent the actual charges on atoms in a molecule. formal charge is the comparison of an atom's associated electrons with its isolated valence electrons. formal charge can be used to determine the most plausible lewis structure for a given compound. the formal charges of the atoms in a species must add up to zero.
Formal charges represent the actual charges on atoms in a molecule.
The formal charge can be used to determine the most plausible Lewis structure for a given compound.
What is meant by a formal charge?A formal charge is defined as the charge that is assigned to an atom in a molecule in which we assume that electrons in all chemical bonds are shared equally between two atoms without relative electronegativity. The formula for assigning formal charge to atoms in the Lewis structures is given below:
Formal charge = Number of valence electrons - (number of lone-pair electrons + half number of bonding electrons).
''Lone pair electrons" are also called "nonbonding pairs" or "unshared pairs". When an atom has several bonds and a complete octet shell, then its formal charge is 0. Formal Charge is the charge of an atom in a molecule or ion in which all of the bonding electrons were divided between atoms in the bond equally.
So we can conclude that options A and C are the correct answer.
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If copper (ii) sulfate solution and an iron nail are in contact, a replacement reaction occurs. what would the products of the reaction be? 2fe 3cuso4 → ? 2fe 3cuso4 fe2(so4)3 3cu 2fe 3cu 3s 3o4
The result of the replacement reaction [tex]2Fe +3 CUSO_{4}[/tex] is [tex]2Fe(SO_{4} )_{3} + 3 Cu.[/tex]
Reaction[tex]2Fe +3 CUSO_{4} ----------- > 2Fe(SO_{4} )_{3} + 3 Cu.[/tex]
the above reaction is a Displacement reaction.
Displacement reaction.
When an atom or group of atoms in a molecule is replaced by another atom, this is referred to as a displacement reaction. For instance, copper metal is displaced when iron is added to a solution of copper sulfate.
What causes a displacement response to happen?When one element replaces another in a compound, it causes a single displacement reaction. Neither metal nor a nonmetal may be used as a substitute for another metal. Only a more reactive component of the chemical it reacts with can take the place of the other component.
How about an illustration of double displacement?A new insoluble ionic compound is created by a precipitation reaction between two aqueous ionic compounds. The reaction between lead (II) nitrate and potassium iodide to produce (soluble) potassium nitrate and (insoluble) lead iodide is illustrated below.
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WILL GIVE BRAINLIST AND 20 POINTS
Which of the following has the largest ionic radius?
Mg 2+
S 2-
F -
The largest ionic radius is strontium.
Barium +2 has the largest ionic radius because the atomic number of barium is 56. This means that the form of barium is larger than Ca +2, Mg +2. All these ions are isoelectronic as they contain 18 electrons each. For isoelectronic ions, the positive nuclear charge is small and the ion size is large. The electron cloud expands, increasing the size of negative ions. Therefore, the correct order of increasing ionic radius is Mg2+
The ionic radius increases within the group. In the next option, strontium has the largest ionic radius because the elements placed in the periodic table are beryllium magnesium calcium and strontium. These elements belong to the alkaline earth metals. Both structural analysis and solvation energy calculations together indicate that Li+ adopts a rigid solvation structure.
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a chemist prepares a solution of barium chloride by measuring out of barium chloride into a volumetric flask and filling the flask to the mark with water.
The concentration of the barium chloride solution is found to be 29.67 µmol/L.
The quantity of solute that has been dissolved in a certain volume of solvent or solution is measured by the solution's concentration. A solution that contains a lot of dissolved solute is said to be concentrated. If there is just a little amount of dissolved solute in a solution, it is said to be dilute.
Molarity is one of the most often used ways to represent the concentrations of solutions. It is the quantity of moles of solute dissolved in a solution that is one liter in size.
Given:
Barium chloride = 8.9 µmol
Volume = 300ml
To find:
Concentration of the solution = ?
Formula:
(Concentration of solute / volume of solution) x (1000mL/1L)
Calculations:
(8.9 / 300) x (1000/1)
= 29. 67 µmol/L
Result:
Therefore, the concentration of the barium chloride solution is 29.67 µmol/L
The complete question is:
A chemist prepares a solution of barium chloride by measuring out 8.9 μmol of barium chloride into a 300mL volumetric flask and filling the flask to the mark with water.
Calculate the concentration in μmol/L of the chemist's barium chloride solution. Round your answer to 2 significant digits.
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An invasive species is a species that disrupts the ecosystem into which it is introduced by displacing species.
An existing ecosystem can suffer from damage from invasive species in many different ways, such as shifting habitats and depriving native creatures of food and resources.
What is an invasive species?An invasive species is an organism that damages the environment or the economy in a new location in which it is not native. Invasive species may disrupt the food chain of a ecosystem by killing or substituting natural food sources. The invasive species could provide little to no food value to wildlife.
What is an example of a invasive species?Accidental introduction of invasive species into a new area is common. In Central Asia, the Black Sea and the Caspian Sea are home to zebra mussels. Zebra mussels accidently made their way to the Great Lakes of North America after becoming affixed to massive ships that sailed between the two areas.
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A 50.0 mL unknown aqueous sample was tested in the laboratory. The unknown sample was identified
to be lead (II) ions by a precipitation reaction with sodium iodide. Since the unknown was identified to
have lead (II) ions in it, a student added excess sodium chloride (NaCl) to the 50.0 mL sample. A white
precipitate was made and was subsequently filtered, washed, and dried to completion. The precipitate
was measured to have a mass of 2.350 grams.
The student added sodium chloride in order to precipitate lead II chloride because this is a positive test for lead II ions.
What is a precipitate?Some times when we carry out an aqueous phase reaction, the products of the reaction would be found to be in the solid phase. This implies that one of the products of the reaction is insoluble in water and separates out of the solution.
In this case, the student knows that lead II chloride is insoluble in water thus it is obtained upon the addition of sodium chloride. This informed the addition of the sodium chloride solution.
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Missing parts;
A 50.0 mL unknown aqueous sample was tested in the laboratory. The unknown sample was identified
to be lead (II) ions by a precipitation reaction with sodium iodide. Since the unknown was identified to
have lead (II) ions in it, a student added excess sodium chloride (NaCl) to the 50.0 mL sample. A white
precipitate was made and was subsequently filtered, washed, and dried to completion. The precipitate
was measure to have a mass of 2.350 grams.
(a) How did the students determine through the addition of sodium iodide that the sample had lead (II)
ions in it?
after separating your partition samples in the burettes, you add 3 drops of ferric chloride to the pre/post-partition salicylic acid solutions. you notice that the pre-partition solutions turned a much more vibrant purple color than their respective post-partition solutions. this suggests that:
The more vibrant purple color of the pre-partition solution suggests that the concentration of salicylic acid is higher in the pre-partition solution than in the post-partition solution because of the complex formed.
Ferric chloride (orange in color) interacts with phenolic hydroxy groups by creating a complex that has a strong purple color. The intensity of the color is proportional to the concentration of the phenol. Because salicylic acid contains a phenolic hydroxy group, its solution will also turn purple upon the addition of ferric chloride. If the pre-partition sample has a more vibrant color, then this means that the concentration of salicylic acid in it is significantly higher, which can then inform us on the effectiveness of the separation and partition process.
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in addition to acting as a comparison to the post-partition salicylic acid solution, the pre-partition salicylic acid solution (no mixing with chloroform) serves a 2nd propose to:
In addition to acting as a comparison to the post-partition salicylic acid solution, the pre-partition salicylic acid solution (no mixing with chloroform) serves a 2nd propose to act as a standard for linear regression analysis.
What is the text of Fick's law?According to Fick's law, the rate of a substance's diffusion across a unit area (like a surface or membrane) is proportional to the gradient in concentration.What is the definition of Fick's first law?According to Fick's First Law, the proportionality constant D for flow to concentration gradient is the diffusion coefficient.What makes Fick's law significant?As oxygen and carbon dioxide must pass through the alveolar membrane in the course of the gas exchange process, the velocity at which gases can diffuse across membranes is a crucial component of respiratory physiology.What is the second diffusion law of Fick?The rate of concentration buildup (or depletion) within a volume is proportional to the local curvature of the concentration gradient, according to Fick's second law of diffusion.To learn more about Fick's law visit:
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in the lab you found the acrylic density cube was found to have a volume of 1.01 cm3. what would you predict the volume to be in milliliters using the water displacement method?
Because a flux-pressure curve is initially measured before the pore size distribution is determined, the liquid displacement method is an indirect approach for determining the pore size distribution of a membrane.
Water displacement method - To do this, all you need to do is place the food in a resealable zipper-lock bag, and then carefully lower the bagged food into the cooking vessel filled with water. Air is forced through the top of the bag by the water's pressure. Carefully seal the bag once the majority of the air has been removed, just above the water line.
Total volume minus liquid volume equals volume of the thing.
6.2 mL minus 5.5 mL equals 0.7 mL.
Now, the object's density will be;
Mass / volume equals density (Liquid - Displacement).
We swap out
Density = 0.66 g / 0.7 mL (Liquid - Displacement)
Density = 0.942857 0.94 g/mL (Liquid - Displacement).
As a result, the cube's density for the liquid displacement method is 0.94 g/mL.
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How many moles of atoms are there in 8.674
x1023 atoms Ne?
Answer in units of mol.
Answer:
great question
Explanation:
Help PLSSSSSSSSSSSSS
The answer is the first one.
Sociology emerged in the early 1800s during a period of great social change when many academics and other educated citizens were fascinated by scientific discoveries. Social issues like the low high school graduation rate continue to interest sociologists today. Why do you think it is still important to understand and study society today?
Sociology emerged in the early 1800s during a period of great social change when many academics and other educated citizens were fascinated by scientific discoveries social issues like the low high school graduation rate continue to interest sociologists today still important to understand and study society today because it gives students an understanding of the real world around them
Sociology is the of human society and social behavior and it started from 1800s during a period of great social change and studying social sciences gives students an understanding of the real world around them an students learn about places, cultures, and events around the world, what conspired to make them the way they are can make inferences about how the rest of the world works
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What is the energy of a 4.25 x 10^8 Hz wave?
The energy of a 4.25 × 10⁸ Hz wave is 2.816 × 10-²⁵ J.
How to calculate energy?The energy of a wave can be calculated by multiplying the frequency of the wave by Planck's constant as follows:
E = hf
Where;
E = energy (J)H = Planck's constant (J/s)f = frequency (Hz)According to this question, the frequency of a wave is given as 4.25 × 10⁸ Hz. The energy, if the Planck's constant is 6.626 × 10-³⁴ J/s, can be calculated as follows:
E = 6.626 × 10-³⁴ × 4.25 × 10⁸ Hz
E = 2.816 × 10-²⁵ J
Therefore, the energy of the wave is 2.816 × 10-²⁵ J.
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a helium gas balloon has a volume of 1 m3 and a gas pressure of 1.2 atm. when it is high in the sky, the volume increases to 2 m3. assuming the gas temperature does not change and there is no gas leakage, the gas pressu
Using the ideal gas law equation, the gas pressure of helium becomes 0.6atm when the volume increases to 2[tex]m^3[/tex].
The general gas equation, often known as the ideal gas law, is the equation of state for a fictitious ideal gas. Although it has several restrictions, it is a decent approximation of the behaviour of numerous gases under various circumstances.
According to the ideal gas law, all gases have an equal number of molecules in an equal volume at a given temperature and pressure.
Ideal gas law:
PV = nRT
where,
P – Pressure
V – Volume
n – No. of moles
R – Gas constant
T - Time
Given:
V1 = 1[tex]m^3[/tex]
P1 = 1.2atm
V2 = 2[tex]m^3[/tex]
To find:
P2 = ?
Formula:
PV = nRT
Calculations:
PV/T = constant
P1V1/T1 = P2V2/T2
Since T1 = T2,
P1V1 = P2V2
1.2 x 1 = P2 x 2
P2 = 1.2 x 1 / 2
P2 = 0.6atm
Result:
The gas pressure of helium becomes 0.6atm when the balloon rises high and the volume increases to 2[tex]m^3[/tex].
The complete question is:
a helium gas balloon has a volume of 1[tex]m^3[/tex] and a gas pressure of 1.2atm. when it is high in the sky, the volume increases to 2[tex]m^3[/tex]. assuming the gas temperature does not change and there is no gas leakage, the gas pressure becomes _____atm.
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