The student made a mistake in Step 2 by calculating the moles of magnesium chloride. The grams should be measured to make the solution.
How do you prepare a solution?In preparing a solution of a solid, we would need to follow a number of steps so that the desired concentration of the solution is what we would end up having.
The steps to be followed are;
1) Gather a graduated cylinder, balance, and stirring rod.
2) Calculate the mass of magnesium chloride needed.
3) Add the water to reach 0.5 L of magnesium chloride solution and stir until dissolved.
4) Label the solution 0.1 M MgCl2.
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2. A 1kg book falls on the floor when sitting at the height of 4m how much kinetic energy
does the book have?
The object's potential energy is highest at the height from which it is dropped. Its potential energy diminishes while its kinetic energy grows as it descends.
PE = 1 kg
g = 9.8 m/s2
h = 100 m PE =? J m
PE = 1 kg 9.8 m/s2 = 980 kg•m2/s2 = 980 J
Is kinetic energy affected by height?In contrast to potential energy, an object's kinetic energy is related to other fixed and moving objects in its immediate environment. For example, if the object is positioned at a larger height, its kinetic energy will be greater.
According to its mass and beginning height, an item carried at a specific height above the ground has an initial potential energy (PE). When the thing is released, the velocity of the object rises as it falls. This increase in velocity increases the object's kinetic energy (KE).
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a sample of an unknown gas effuses in 10.7 min. an equal volume of h2 in the same apparatus under the same conditions effuses in 2.42 min. what is the molar mass of the unknown gas?
Molar mass of the unknown gas= 39.09 g / mol
T= TIME
MW= MOLAR MASS
MW H₂ = 2
now, Apply graham law--
graham law states that rate of effusion of a gas is inversely proportional to square root of the molar mass of its particle.
Rate1/rate2 = √(MW2/MW1)
T2/T1 =√(MW2/MW1) (BECAUSE, VOLUME EQUAL)
(10.7/2.42)²= MW2/2
MW2=molar mass of the unknown gas = 2α×(10.7/2.42)²
=39.09 g / mol
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Object A has a density of 2.6 g/cm³. What is the mass of 36.5 cm³ of object A in units of g
According to solving the object's mass is 94.9g.
Mass: What is it?One of the fundamental quantities in physics and the most fundamental aspect of matter is mass. A body's mass is the measurement of the volume of matter it contains. The kilogram serves as the SI unit for mass (kg). This is how the mass formula appears:
Mass is equal to Density x Volume.
How do mass, density, and volume relate to one another?How much space an object or substance occupies is determined by its volume.
A substance or object's mass is a measure of how much matter it contains. The density of an object or substance is the ratio of its mass to its volume, or the quantity of material it contains (its mass).
According to the question
Object density=2.6g/cm³
volume= 36.5 cm³
Formula :-Mass = Density × Volume
M=2.6g/cm³ ×36.5 cm³
M=94.9g
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A 5.0 Amp current is passed through a solution of copper (II) sulfate for four hours. How many grams of copper could form on the cathode during this process?
The amount of copper that would be deposited on the cathode during the process is 47.75 g.
What is the amount of copper (II) deposited?
The amount of copper (II) deposited is calculated as follows;
CuSO² ⇄ Cu²⁺ + SO₄²⁻
Cu²⁺ + 2e⁻ → Cu
.
From the oxidation reaction above, we can infer that,
2F -----------> 64 g of copper (Cu)
where;
F is Faraday = 96500 CThe quantity of charge passed through the solution of copper (II) sulfate for four hours is calculated as follows;
Q = It
where;
I is the currentt is the time of current flowQ = (5 A) x (4 hrs x 3600 s/hr)
Q = (5 A) x (14,400 s)
Q = 72,000 C
The amount of copper that will be deposited by this quantity of charge is calculated as follows;
96500 C --------> 64 g
72,000 C ---------> ?
= (72,000 X 64) / 96500
= 47.75 g
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Circle the correct word: Protons and neutrons contribute (mass or volume) to the atom.
Answer:
mass
Explanation:
Protons and neutrons contribute mass to the atom.
Help me i have till 5 to get this assignment in
Energies of given waves exists:
6. 17.27 × [tex]10^{-20}[/tex] J
7. 63.61 × [tex]10^{-23[/tex] J
8. 9.99 × [tex]10^{-24}[/tex] J
9. 41.5 × [tex]10^{-21}[/tex] J
10. 16.89 × [tex]10^{-19}[/tex] J
What is the relation of frequency and energy?E = hv is the energy equation. In the formula, E stands for energy, h for Planck's constant (6.626 × 10 -34 J s), and v for frequency. Since frequency rises as energy falls, frequency and energy are related directly in the energy equation.Energy travels in waves. Their frequency and amplitude both affect how much energy they transport. The amount of energy increases with frequency and amplitude, respectively.Energy is inversely correlated with wavelength because it is directly proportional to the electromagnetic frequency of the photon. The energy of a photon increases with its frequency. In other words, the energy of a photon decreases with increasing wavelength.The energies of given waves exists:
6. 17.27 × [tex]10^{-20}[/tex] J
7. 63.61 × [tex]10^{-23[/tex] J
8. 9.99 × [tex]10^{-24}[/tex] J
9. 41.5 × [tex]10^{-21}[/tex] J
10. 16.89 × [tex]10^{-19}[/tex] J
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in a 4.00 l pressure cooker, water is brought to a boil. if the final temperature is 115.0 °c at 3.20 atm, what quantity in moles of steam are in the cooker?
The no. of moles of steam present in the cooker is 0.402 mol.
The ratio between a substance's given mass in a chemical reaction and the mass of one mole of that material is used to determine how many moles there are of that substance. Any material has an atomic mass of one mole, or 6.023 x [tex]10^{23}[/tex], according to Avogadro. Additionally, No. of moles is employed to represent concentration measurements like mole per liter and molecular weight.
Given:
Pressure, P = 3.20atm
Volume, V = 4L
Temperature, T = 115℃ = 115 + 273 = 388K
To find:
No. of moles, n = ?
Formula:
PV = nRT
Calculations:
n = 3.20 x 4 / 0.082 x 388
n = 0.402 mol
Result:
0.402 moles of steam is present in the cooker.
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When a screen is used to easily separate substances, what physical properties are being used?
Responses
temperature, size
temperature, size
size, shape
size, shape
texture, shape
texture, shape
density, buoyancy btw this is science
When a screen is used to easily separate substances, what physical properties are being used then the size are used
A physical property is a characteristic of matter that is not associated with a change in its chemical composition and similar examples of physical properties include density, color, hardness, melting and boiling points, and electrical conductivity and the physical property that is in use when substances are separated using a screen is differences in particle size of the substances and this is the separation method
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Answer:
d
Explanation:
A typical car battery in a car is filled with a solution of sulferic acid, which is approximately 39.9% sulfuric acid. If the density of this
solution is 1.3 g/mL, determine the number of grams present in 500.0mL of battery solution.
This tells you that the reaction will always consume 2 times more moles of lithium hydroxide than moles of sulfuric acid.
Explanation of Sulfuric Acid?The balanced chemical equation can be used to help you figure out how many moles of each reactant must be present in solution in order for complete neutralization to occur when it comes to neutralization reactionH2SO4(aq]+ 2LiOH(aq]→ Li2SO4(aq]+ 2H2O(l]Lithium hydroxide and sulfuric acid have a 2 mole ratio. You can infer from this that the reaction will always consume.Lithium hydroxide has twice the moles of sulfuric acid.
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What does the sun supply to a leaf?
starch
water
light energy
gas
The sun provides energy to the leaves through photosynthesis. It converts the sun's rays into sugar and provides energy to the leaves.
When sunlight hits the leaves packets of light called photons bounce off the chlorophyll molecules. In doing so it knocks electrons out of orbits around the magnesium atom. Electrons have a negative charge, so the loss of an electron produces a positively charged magnesium ion. Plants absorb energy from the sun through a process called photosynthesis to power processes necessary for survival.
Harvest the sun's energy with the help of chlorophyll in the cells of the leaves. Chlorophyll captures and packs energy from the sun's light in a process called photosynthesis. Leaves usually have a large surface area to maximize sunlight. Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to produce oxygen and energy in the form of sugars. The more light a plant is exposed to, the less chlorophyll it synthesizes.
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A 1.02 g magnesium supplement contains 25.0% Mg by mass. The magnesium is present in the supplement as MgO(s) (molar mass 40.30 g/mol). How many grams of MgO(s) are in the magnesium supplement? Write your answer using three significant
Based on the percentage mass of magnesium oxide in the sample, the mass of Magnesium oxide in the sample is 0.42 g.
What is the mass of magnesium in the supplement?Magnesium is a metallic element with an atomic number of 12.
Magnesium is an important mineral that is used as a supplement s well as in drugs such as milk of magnesia.
Considering the given magnesium supplement:
1.02 g magnesium supplement contains 25.0% Mg by mass.
Magnesium is present in the supplement as magnesium oxide, MgO.
The molar mass of magnesium oxide, MgO = 40.30 g/mol
Molar mass of magnesium = 24.0 g
Percentage mass of Magnesium oxide in the sample = 40.3 / 24 * 25
Percentage mass of Magnesium oxide in the sample = 42%
Mass of Magnesium oxide in the sample = 42 % * 1.02
Mass of Magnesium oxide in the sample = 0.42 g
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What is the force that holds a pencil down against a desk?
Responses
friction
momentum
gravity
normal
Answer:
Gravity
Explanation:
Gravity is the force that attracts a body towards the centre of the earth, or towards any other physical body having mass.
Answer:
Gravity
Explanation:
Gravity is the force that attracts a person or an object to weigh, or pull. I hope this helped :)
Find the balanced molecular equation FeSO4(aq) + K3PO4(aq) →
Answer:
3FeSO4 + 2K3PO4 → Fe3(PO4)2 + 3K2SO4
Explanation:
what effect does a catalyst have on the energy of a reaction system
What would happen if three types of water
are placed in the same container?
pentacarbonyliron (fe(co)5) reacts with phosphorous trifluoride (pf3) and hydrogen, releasing carbon monoxide: fe(co)5 2pf3 h2 → fe(co)2(pf3)2(h)2 3co the reaction of 5.0 mol of fe(co)5, 8.0 mol of pf3 and 6.0 mol of h2 will release mol of co.
Fe(CO)₅ is the limiting reactant given the provided statement since it has the lowest ratio.
What defines a limiting reactant?The quantity of product that can be created is constrained by the reagent that is used first in a chemical reaction, also referred to as the limiting reactant (or limiting reagent).
Briefing:Calculating the moles supplied/moles stoich ratio will reveal the limiting reactant, which is the one with the lowest value.
Fe(CO)₅ ratio = [5 g / 195.9 g/mol] / 1
Fe(CO)⁵ ratio = 0.025
PF3 ratio = [8 g / 87.97 g/mol] / 2
PF3 ratio = 0.045
H2 ratio = [6 g / 2 g/mol] / 1
H2 ratio = 3
We can see that Fe(CO)5 has the lowest ratio, so it is the limiting reactant.
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Zinc metal reacts with yellow crystals of sulfur in a fiery reaction to produce a white powder of zine sulfide. A chemist determines that 65.4 g zinc reacts with 32.1 g of sulfur. How many grams of zinc sulfide are produced?
Answer:
Explanation:
Zn + S ---> ZnS
Mass of Zinc + Mass of Sulphur = Mass of Zinc sulfide ( Law of conservation)
Mass of zinc= 65.4g
Mass of Sulfur = 32.1g
Mass of Zinc Sulfide= (65.4 + 32.1)g
Mass of Zinc Sulfide = 97.5g
Based on their location in the Periodic Table, which of the following pairs of elements would react with water in a similar way because they are in the same group and family?
A) Na, CI
B) Si, As
C) K, Rb
D) Cs, Ba
In each pair below, circle the particle which you believe is larger and justify your choice in the space
provided.
Lithium Atom or Lithium Common Ion
Fluorine Atom or Fluorine Common Ion
Sodium Common lon or Magnesium Common Ion
Oxide Common lon or
Fluoride Common lon
Lithium Atom, Fluorine common ion, Magnesium Common ion, Oxide common ion are the ones that are larger in each of the choices as given.
What are cations and anions?Positively charged ions are known as cations. Negatively charged ions are further referred to as anions. A charged atom or molecule can be referred to as an ion.
A balanced atom will change into a positively charged cation if one or more of its electrons are lost. A balanced atom will change into a negatively charged anion if it gains one or more electrons.
In the formula for an ionic compound, the positive ion, known as a cation, is listed first, followed by the negative ion, known as an anion. The net charge or neutral electrical charge in a balanced formula is zero. A cation can be either positive or negative.
An anion contains more protons than electrons, while a cation has a net positive electrical charge. An anion has a greater number of electrons than protons and a net negative electrical charge.
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A one paragraph summary of 5 sentences of how petroleum forms. Which must include the following terms:
-Sea
-organisms
-pressure
-high temperatures
-petroleum
-sediments
-sedimentary rock
-seafloor
-millions of years
please underline the words I just showed: pays 30
Petroleum is a fossil fuel that was formed from sediments of plants and animals left over millions of years through the transformation of dead organisms that are buried under the sea and seafloors such as algae, plants, and bacteria, that experienced high temperature and pressure when trapped inside rock formations such as the sedimentary rocks.
What is petroleum?Petroleum, also referred to as crude oil, is a naturally occurring liquid found beneath the earth’s surface which can be refined into fuel.
Petroleum is a fossil fuel that is created by the decomposition of organic matter over time and used as fuel to power vehicles, heating units, and machines, and can be converted into plastics.
Petroleum is mostly recovered through oil drilling and then refined and separated into different types of fuels. Petroleum contains hydrocarbons of different molecular weights. The petroleum has a property of the denser the petroleum the more difficult it is to process and the less valuable it is.
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If the mass of the ice to the cup increases the total energy in the cup will what
The mass of the ice to the cup increases The total energy in the cup will - The mass remains unchanged.
What is mass?
The total amount of matter in a physical body is defined as its mass. In the presence of a net force, it also serves as a gauge for the body's inertia, or resistance to acceleration (change in velocity). The gravitational pull of an object on other bodies is also influenced by its mass. The kilogramme is the SI's primary mass unit (kg). Even though weight is frequently measured with a spring scale rather than a balancing scale and directly compared to known masses, mass and weight are not the same thing in physics. Because of the lower gravity on the Moon, an object would weigh less while maintaining the same mass as it does on Earth.
The latent heat of fusion is absorbed by the mass. This is required for phase changes.
Despite absorbing heat from the environment, the temperature stays the same as long as there is still some ice present. The warmth that is absorbed is used as latent heat rather than sensible heat.
The mass remains unchanged.
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A compound of carbon and hydrogen and oxygen (ethylene glycol- antifreeze) is determined to be 38. 7% C, 51. 6% O, and 9. 7% H. Calculate the molecular formula of the molar mass is 62 g/mol
The molecular formula of the given is 0.519.
Equation :To calculate the molecular formula we need a simple formula,
molecular formula = divide the molecular mass / empirical formula
So, the known are
molecular mass = 62 g/mol
empirical formula = CH₃O
C = 38. 7%
H = 9. 7%
O = 51. 6%
empirical formula = 38. 7% + (9. 7% x 3) + 51. 6%
empirical formula = 119.4
Now, putting the values in formula
molecular formula = molecular mass / empirical formula
molecular formula = 62 g/mol / 119.4
molecular formula = 0.519
Hence, the molecular formula is 0.519.
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What is the final temperature of a 300.0 gram glass of water if it is placed
in the microwave at 22.0°C and it absorbs 5000.0 joules of energy?
The final temperature of a 300.0-gram glass of water if it is placed
in the microwave at 22.0°C and it absorbs 5000.0 joules of energy is
3.987°C.
What does ' amount of heat gained or lost " means?The equation q = MCT, where m is the mass of the sample, c is the specific heat, and T is the temperature change, can be used to determine the amount of heat that a sample (q) gains or loses. q = mct. liquid mass, m (so this would be in grams) t = temperature change. For example, water's particular constant, C, is 4.2 J g-1 K-1, therefore you just enter that value into the formula in the exam to get the energy of water.
Calculating heat energy involves using the equation Q = MCT. Mass, specific heat, and temperature change are all components of heat energy. Q = MCT. where Q is the heat energy, M is the material's mass, C is the specific heat, and T is the temperature change.
q = m CΔT
5000 J = 300 g × 4.18 J × ΔT
ΔT = 5000/1254
= 3.9872
= 3.987°C.
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is it true that the physical constants of abuse substance depend on the mass of the sample used
No, the physical constants of abuse substance do not depend on the mass of the sample used.
Does mass have an impact on density?Mass and volume are intimately correlated with density. In reality, it explains the precise nature of the connection between the two. By dividing the mass of an object by its volume, we may get its density. The mass is considered to have a low density if it has a high volume but a tiny mass.
By dividing a material's mass by its volume, one can get a material's density, which is defined as its mass per unit volume. Returning to the molecular level, the mass of a material's molecules and how tightly they are packed together determine the material's density.
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problem b. a silicon crystal is to be grown using the czochralski method. the ingot of crystalline silicon is to contain 3x1015 dopant atoms/cm3. (show your work.) a. if kd
A small seed crystal is placed into a melt in a crucible and pulled upward to form a single crystal using the Czochralski (CZ) method of crystal formation. The approach was created in 1916 by a Polish scientist by the name of Jan Czochralski.
How is silicon crystallized using the Czochralski CZ method?
The Czochralski method is to be used to create a silicon crystal as the solution to problem B. The crystalline silicon ingot must have 3x1015 dopant atoms per cubic centimeter. (Indicate your work.) a. if kd
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Please may someone help me with the bottom bit!
Precipitate definition (Entry 2 of 3) 1: a substance that has been physically or chemically isolated from a solution or suspension, typically in the form of an insoluble crystalline or amorphous solid. 2: a byproduct, outcome, or result of a procedure or action. adjective. precipitate.
What is an example of precipitate in chemistry?Precipitation Illustration
Silver chloride will solidify out of solution when silver nitrate and sodium chloride are combined in water. Silver chloride is the precipitate in this instance.
What does precipitate represent?Solids are created by the process of precipitation after two chemicals react. The downword () arrow symbol is used to represent the production of precipitate in this type of reaction.
What two types of precipitate are there?It happens between the reactant ions in the aqueous solutions that give rise to the material. Complete response: Precipitation includes the following: snow, sleet, hail, and rain.
What color is precipitate?An excess of the light blue precipitate dissolves to create an inky transparent solution. A little amount of sodium hydroxide solution and subsequently an excessive amount are added to solution W. There develops an insoluble white precipitate.
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The important discovery from Rutherford’s gold foil experiment was that _______________.
Group of answer choices
alpha particles pass through gold un-deflected because of the small size of the atom.
alpha particles are dense
electrons are not attracted to positively charged alpha particles.
the volume occupied by an atom is largely empty space.
The important discovery from Rutherford’s gold foil experiment was that the volume occupied by an atom is largely empty space.
What is an experiment?An experiment can be described as a procedure carried out to support or refute a hypothesis, or determine the efficacy or likelihood of something previously untried.
Rutherford's model was the first to introduce the concept of an atomic nucleus. This novel idea accounted for the sparse distribution of electric charges that was revealed in Rutherford's famous gold foil experiment.
Rutherford in his experiment shot a beam of alpha particles at a sheet of gold foil, where some of these particles were deflected.
That accounted for the theory that the volume occupied by an atom is largely empty space.
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does anyone know how to answer this question?
heat is added to a 200.-gram sample of h2o(s) to melt the sample at 0°c. then the resulting h2o( ) is heated to a final temperature of 65°c. 5. compare the amount of heat required to vaporize a 200.-gram sample of h20( ) at its boiling point to the amount of heat required to melt a 200.-gram sample of h2o(s) at its melting point.
54.418 kJ amount of heat required to completely melt the200gm of H2O sample at its melting point.
What is the calculation of the above problem?Mass of water = 200 g
Initial temperature of the water = 0°C
Final temperature of the water = 65°C
Temperature change = Delta T = 65
Specific heat capacity = 4.168J/g C
(1 kJ = 1000J)
54.418 kJ amount of heat required to completely melt the sample.
At 100 C and 1 atm, how much heat is required for 1 g of water to evaporate?At 100 °C, which is where water boils, the heat of vaporization for water is around 540 cal/g.
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Which sample is composed of particles arranged in a regular geometric pattern?
A) Cl2(g)
B)CCl4(l)
C)LiCl(s)
D)LiCl(aq)
Solid Lithium chloride (LiCl) is made up of particles arranged in a regular geometric pattern. Therefore, option (C) is correct.
What types of solids have geometric patterns?In the crystalline Solid, the constituent particles are closer to each other due to the intermolecular force of attraction between them. So there is no free space between them due to which its shape can't be changed which is said to be regular geometry.
The building constituents in crystalline solids, arrange in a regular manner throughout the entire 3D network. The ordered arrangement of constituent units extends over a large distance. Thus, crystalline solids have a long-range arrangement. A crystalline solid contains a large number of units called crystals.
Lithium Chloride is a white solid soluble in water, ether, and alcohol and chemical formula for lithium chloride is LiCl. Lithium chloride has the same crystal structure as NaCl.
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