The percent of aluminum (Al) by mass in the given mixture of the two powdered oxides is 29%.
What is the mass percent formula?The mass percent formula can be expressed by mass of the each element in one mole of the compound. The mass percentage of each component can be calculated as:
Mass percentage = (Mass of an element 1 mole of the compound)/ (molar mass of compound) × 100
Given, the mass of the mixture of the oxides Al₂O₃ and Fe₂O₃ is equal to 10.0 g.
The mass of the Al₂O₃ recovered = 5.5 g
The number of moles of Al₂O₃ = 5.5/101.96 = 0.054 mol
One mole of Al₂O₃ has two moles of aluminum.
0.054 mol Al₂O₃ will have moles of aluminum = 0.054 × 2 = 0.108
The molar mass of the aluminum (Al) = 26.98g/mol
The mass of 0.108 mol of Al = 0.108 × 26.98 = 2.9 g
The percentage by mass of Al in mixture = (2.9/10) × 100 = 29%
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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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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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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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PLEASE HELP HALF MY GRADE!!What is a procedure you can follow to find evidence that yeast and plant cells produce carbon dioxide
during cellular respiration?
Answer:
Cellular respiration is the process where cells break down glucose and then they convert it into energy. Cellular respiration is important because without cellular respiration there would not be any energy and without energy there would not be any food.
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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what is causing the marshmallow to change their sate of matter
Answer:
Any form of semi high energy waves cause the water molecules inside the marshmallow to vibrate which heat and soften the sugar matrix inside the marshmallow. The weakened sugar matrix allows air bubbles within the marshmallow to expand rapidly and the marshmallow puffs up and becomes goo. If this proccess is repeated it can completly change it's state of matter.
Explanation:
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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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:
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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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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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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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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-) Potassium is also in Group 1 of the periodic table. Potassium reacts with water in a similar
way to lithium. Write down two differences you would see between the reactions of
potassium and lithium with water.
Lithium react slowly with water while potassium react violently with water. potassium caught fire while lithium does not caught fire.
What is chemical reaction?Chemical reaction is defined as a procedure in which one or more compounds, known as reactants, are changed into one or more distinct substances, known as products.
It can also be defined as a process in which two or more molecules collide with the proper orientation and enough force to produce a new product.
There are mainly five types of reaction.
Synthesis reactionAcid base reactionRedox reactionDecomposition reactionPrecipitation reactionThus, Lithium react slowly with water while potassium react violently with water. potassium caught fire while lithium does not caught fire.
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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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what effect does a catalyst have on the energy of a reaction system
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
How would the amount of water produced compare if you ignited a very large balloon of hydrogen and oxygen instead of a very small balloon filled with the same reactants (hydrogen and oxygen)?
The amount of water that we get from the large balloon is greater than the amount of water that we get from the small balloon.
What is the ratio of the reactants in water?
We know that water is composed of hydrogen and oxygen. Let us recall that the ratio of the water and the oxygen that form the water molecule is fixed irrespective of the volume of the water that we use for the reaction.
If we compare if you ignited a very large balloon of hydrogen and oxygen instead of a very small balloon filled with the same reactants, we would notice that the amount of water that is formed from the large balloon of hydrogen and oxygen is greater than that produced from a very small balloon filled with the same reactants.
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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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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 :)
Click oil basics to explore the natural resources needed for the production of plastics. use the information to answer the question. which of these ingredients is important in making plastics? carbon dioxide particulate matter natural gas volatile organic compounds
The correct answer is option C: natural gas
The ingredient which is important in making plastics is natural gas.
Plastics are the refined form of natural gas, plant liquids, and crude oils.
Plastics can be manufactured in two ways: synthetic and biobased.
Synthetic plastics come from raw materials including natural gas, crude oil, and coal.
On the contrary, biobased plastics are manufactured from renewable materials such as starch, vegetable fats, oils, and carbohydrates.
However, the most common method of plastic manufacturing is the transformation of raw materials into refined propane and ethane.
In the next step, ethane and propane undergo cracking which transforms them into ethylene and propylene which are the building blocks of long chains of polymers.
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Answer:it's C
Explanation:
I just did it on Edge you're welcome Happy early Halloween you're beautiful and have a nice day. :)
does anyone know how to answer this question?
Find the balanced molecular equation FeSO4(aq) + K3PO4(aq) →
Answer:
3FeSO4 + 2K3PO4 → Fe3(PO4)2 + 3K2SO4
Explanation:
When a metal is reduced by reaction with carbon, which element is removed from the compound?
A: Carbon
B: Oxygen
C: Hydrogen
D: Silver
Answer:
Oxygen
Explanation:
reduction is the removal of oxygen to a substance
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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1. How does the atomic structure of sodium determine its uses and functions?
Answer:octahedral coordination around Na + and Cl − centers.
If the [H*] changed from [1 x 10-7] to [1 x 10-4], what is the new [OH-]?
01x 10-4
01x10-3
01 x 10-10
01x 10-7
The new concentration of hydroxide ions [OH-] is calculated as 1 x [tex]10^{-10}[/tex] M if the [[tex]H^{+}[/tex]] changed from [1 x [tex]10^{-7}[/tex]] to [1 x [tex]10^{-4}[/tex]] during the concentration change.
How do you determine H+ using pH?By “undoing” the common logarithm by exponentiating both sides with base 10 to obtain [[tex]H^{+}[/tex]] = 10pH.
How can I determine pH?You need to know the hydronium ion concentration in moles per litre to determine the pH of an aqueous solution (molarity). The formula pH = - log is then used to get the pH. [H3O+].
Concentration of [tex]H^{+}[/tex] ions = [[tex]H^{+}[/tex]] = 1 x [tex]10^{-7}[/tex]
When concentration of [[tex]H^{+}[/tex]] ions changed to 1 x [tex]10^{-4}[/tex] M
[[tex]H^{+}[/tex]] = 1 x [tex]10^{-4}[/tex] M
The pH of the solution will further change to:
pH = -log [[tex]H^{+}[/tex]]' = -log [1 x [tex]10^{-4}[/tex]] = 4
pH + pOH = 14
pOH = 14 - 4 = 10
And we know that:
pOH = -log [[tex]OH^{-}[/tex]]
10 = -log [[tex]OH^{-}[/tex]]
[[tex]OH^{-}[/tex]] = 1 x [tex]10^{-10}[/tex] M
Important IdeasIf the pH of the solution is known, it is possible to compute the hydrogen ion concentration in a solution, [H+], in mol L-1.
The negative logarithm (to base 10) of the hydrogen ion concentration in mol L-1 is used to calculate pH. pH equals -log10[H+]
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calculate the volume in liters of a m potassium dichromate solution that contains of potassium dichromate . be sure your answer has the correct number of significant digits.
Incomplete question but using assumed values, the volume of m potassium dichromate solution that contains potassium dichromate is 9.1L
To calculate the volume of solution, we use the equation for molarity of solution:
Molarity of solution = mass of solute/molar mass of solute*volume of solution (in liter)
Where assumed values are:
Molarity of solution = 0.15 M
Given mass of potassium dichromate = 400. g
Molar mass of potassium dichromate = 294.15 g/mol
Volume solution in liter = x
i.e.
0.15 = 400/294.15*x
Volume of solution in liter = 400/294.15*0.15
Volume of solution in liter = 400/44.12
Volume of solution in liter = 9.06
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BRAINLIEST LOTS OF POINTS | One molecule of bromine (Br2) and two molecules of potassium chloride (KCl) combine in a reaction. How many atoms are in the products?
First, write out the equation.
Balance the equation.
Count atoms in the product.
What is the answer?
Answer:
6 atoms
Explanation:
Br2 + 2KCl = 2KBr + Cl2
2KBr = 4 atoms
Cl2 = 2 atoms
total 6 atoms
Chemical reaction between bromine and potassium chloride is 2 KCl +Br₂[tex]\rightarrow[/tex] 2 KBr +Cl₂. There are 6 atoms in the product .
What is a chemical reaction?Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.
There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are four types of chemical reactions:
1) combination reaction
2)decomposition reaction
3) single displacement reaction
4) double displacement reaction
During chemical reactions atoms are rearranged and reactions are accompanied by an energy change as new substances are formed.
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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 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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