Answer:
Below
Explanation:
I1-
Te2-
Ba2+
Cs1+
Use the oxidation number method to balance the following equations: a) Al(s) + H2SO4 (aq) Al2(SO4)3 (aq) + H2 (g)
By using oxidation number method , the balance chemical equation is given by :
2Al + 3H₂SO₄ ------> Al₂(SO₄)₃ + 3H₂
the give equation is :
Al + H₂SO₄ ------> Al₂(SO₄)₃ + H₂
1) write the oxidation number of each atom
reactant product
Al 0 +2
H +1 0
S +6 +6
0 -2 -2
2) Identify the atom which is oxidized and reduced and balance the for these.
Al is oxidized, from 0 to +3 and hydrogen is reduced from +1 to 0.now to balance Al and H, multiply 2 on the right side
2Al + H₂SO₄ ------> Al₂(SO₄)₃ + H₂
3) calculate the total increase in oxidation number in oxidation and same for reduction.
2Al⁰ to 2Al⁺³ ( so total increase is +6)
2H⁺¹ to 2H⁰ ( decrease in -2 )
4) now, make total increase in oxidation number = total decrease in oxidation number .for this multiply 3 to hydrogen both side to get decrease of -6.
2Al + 3H₂SO₄ ------> Al₂(SO₄)₃ + 3H₂
There fore, the balance chemical equation by oxidation number method is given as :
2Al + 3H₂SO₄ ------> Al₂(SO₄)₃ + 3H₂
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Formulate your hypothesis for the problem. Design an experiment to test your hypothesis.
making up an answer:
I hypothesize that water will evaporate quicker under an incubator than on the counter.
The experiment; Equal amounts of water in the same type of containers, one under an incubator, and one on a counter with even temperature.
Can can someone help me 49-58 I give Brainly
Express the number in
standard notation or
standard form.
1.25 x 10²
Standard Form
Answer:
125
Explanation:
the positive 2 on the exponent means you have to move the decimal point 2 times to the right, giving you 125.
you can also simplify the expression to 1.25 * 100 and get 125
A student measure 9.24 mL of an unknown liquid in a graduated cylinder. The mass of the empty cylinder is 34.670 g, and the mass of the cylinder and liquid is 39.671 g. What is the density of the unknown liquid? (remember significant figures and units in your answer)
1. How many MOLECULES of sulfur dioxide are
present in 2.70 moles of this compound?
16.254 × [tex]10^{23}[/tex] molecules
The formula for sulfur dioxide is [tex]SO_2[/tex].
MOLECULES of sulfur dioxide are present in 2.70 moles of this compound
so, we have given the moles of [tex]SO_2[/tex] = 2.70 moles
we have find the number of molecules = ?
1 mole of Na = 6.022×[tex]10^{23}[/tex] molecules
so 2.70 moles of SO2 contains = 2.70[tex]\times[/tex] 6.022×[tex]10^{23}[/tex] molecules
moles of SO2 contains = 16.254 × [tex]10^{23}[/tex] molecules
mole is the number of atoms of an element is equal to the number of atoms in exactly 12.0 g of carbon 126.02 X 10²³ is Avogadro's Number6.02 X 10²³ is the number of particles, atoms, or ions in a moleTo know more about moles visit :
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How many grams of sodium azide are required to produce 31.0 g of nitrogen?
Answer:
1 Gram of sodium azide produces 2.25 grams of nitrogen, so you would need about 13.7777777778 grams of sodium azide to produce 31 grams of nitrogen
Explanation:
which of the following explains why scientists assume that the law of universal gravitation is true on all of the planets in the Solar System
Scientists assume that the law of universal gravitation is true on all of the planets in the Solar System because The planets are always moving perpendicular to the Sun's gravitational attraction, which causes them to follow an elliptical route around it.
According to Newton's universal law of gravitation Every particle in the universe is said to attract every other particle with a force along a line that connects them.The force is inversely proportional to the square of the distance between them and directly proportional to the sum of their masses.F = G(m₁ × m₂ /r²)Where, F is gravitational force between two bodies.
m₁ and m₂ are masses of the bodies.
r is the separation between the two bodies' centres.
G is universal gravitational constant = 6.673 x 10⁻¹¹Nm²/kg².
Big or little, the Law is applicable to all objects having masses. If the distance between two massive objects is very large to their sizes or if they are spherically symmetric, they can be thought of as point-like masses.Thus law of universal gravitation is true on all planets.
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When Sally burns 1.0g of coal she makes 0.2g of ash. Explain her findings.
Answer:
after burning the coal,0.8of coal was lost to produce Ash and it remained little amount of coal
What does the first law of thermodynamics say?
According to the first law of thermodynamics, the total energy of a system, including its surrounds, is conserved if heat is acknowledged as a kind of energy.
The study of thermodynamics looks at the connections between heat, work, temperature, and energy. The movement of energy from one place or form to another is the main focus of thermodynamics. The underlying concept is that heat is a form of energy that may be compared to a certain amount of mechanical work.
The heat was not formally recognized as a form of energy until around 1798, when British military engineer Count Rumford (Sir Benjamin Thompson) discovered that endless amounts of heat could be produced while boring cannon barrels and that the amount of heat produced is proportional to the work done while turning a blunt boring tool. Rumford's finding of the relationship between heat produced and work completed served as the theoretical cornerstone for thermodynamics.
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What is a control group used for?
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What is the formula for Mg & O ionic bonds
Answer:
Oxygen gains two electrons to have an octet. The ionic bond between ions results from the electrostatic attraction of opposite charges. The final formula of magnesium oxide is MgO.
Explanation:
Common brass is a copper and zinc alloy
containing 37.0% zinc by mass and having a
density of 8.48 g/cm³. A fitting composed of
common brass has a total volume of 121.5 cm³
Common brass is a copper and zinc alloy.
it contains 37.0% zinc by mass and having a
density of 8.48 g/cm³. A fitting composed of
common brass has a total volume of 121.5 cm³
as per avove staement , we have got
mass of copper = 63%
density = 8.48 g/cm³
volume =121.5 cm³
now,
Mass of Fitting = Vol * Density = 8.48 * 121.5= 1030 gm.
Mass of copper = 63% of 958.24 = 603.7 gm.
Moles of copper = mass/Mol. wt. = 603.7/63.5 ; [Mol wt. of copper = 63.5]
= 9.507 moles.
Therefore, Atoms of Copper = Moles * NA = 9.507*6.022*10^23
= 5.725*10^24 atoms.
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Jasmin has two gases in separate containers. One gas is colorless, while the other is brown. She connects the containers and allows the gasses to mix. What change indicates that the gases are chemically reacting
Alteration in Temperature, Color Change Noticable Odor, Developing a Precipitate and The emergence of bubbles are the factors indicates that the gases are chemically reacting.
The chemical shift that takes place in reactants during chemical reactions typically manifests as either an obvious alteration, a change in temperature, or other elements that are simple to see or detect. These are the end consequence of the creation and destruction of chemical bonds, which are basically atoms within molecules being rearranged The newly generated material would have unique qualities distinct from those of the original substance. The variances may plainly be seen and are proof of the chemical processes involved in its production.To know more about chemical reactions visit : https://brainly.com/question/14929452
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10. Calculate the wavelength of the light that an electron in a Hydrogen atom would emit if it moved from n=2 to n=1
The wavelength of the light is obtained as 122nm.
What is the wavelength?From the Bohr model of the atom, we know that an electron could absorb energy and move from a lower to a higher energy level. When this electron returns to its ground state, energy is emitted in the form of a photon of visible light.
Given that;
1/λ = RH (1/n1^2 - 1/n2^2)
λ = wavelength of the light
n1 = final level
n2 = initial level
1/λ = 1.097 * 10^7(1/1^2 - 1/2^2)
1/λ = 1.097 * 10^7(1 - 0.25)
λ = 1.22 * 10^-7 m or 122nm
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How many significant figures does the answer of 2.5 + 9.520 contain?
The general rule of sig figs is that if there's a number with less sig figs than another, you should use the amount of sig figs in that number.
For example, if you have the numbers 1 and 7.86 and add them together, 1 only has one sig fig and 7.86 has three. Therefore, you'd add 8.86 and then round up so you have one sig fig as your answer (9).
So now, applying what we know:
[tex]2.5+9.520\\= 12.020\\=12[/tex]
You can see that we rounded down to 12 because there need to be only two sig figs here. If we wrote our answer as 12.0, this would be three sig figs since the 0 after the decimal counts.
Final answer: 2 sig figs
I hope this helps!
Question Which type of object creates the most friction? Responses hard objects hard objects rough objects rough objects smooth objects smooth objects soft objects
The type of object that creates the most friction is a rough object.
What is frictional force?This is the force that opposes the motion of an object. It usually exist between two surfaces that are in contact.
Factors affecting frictional force include the following;
The frictional force between two bodies depends mainly on the following factors:
(I) forces acting on the objects
(ii) type of the surface in contact
(iii) position or inclination of the surfaces
How to reduce frictional force between two surfaces;
Frictional force can be reduced with lubricantsFrictional force can be reduced using bearings in moving parts,Frictional force can reduced using inclined surfacesThus, the type of object that creates the most friction is a rough object.
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A block has a side length of 2.0 cm x 5.6 cm x 11.4 cm. The block has a density of 8.5 g/cm³. What is the block's mass?
A block has a side length of 2.0 cm x 5.6 cm x 11.4 cm
he block has a density of 8.5 g/cm³.
block's mass = ?
from above statement we have got volume = 2.0 * 5.6 * 11.4
= 127.68cm³
density = 8.5 g/cm³.
now density = mass / volume
mass = density * volume
mass = 1,085.28 g
density is the amount of matter in a given space, or volumeCommon units for density are g/cm^3 or g/mL or kg/m^3 or kg/Ldensity is a physical propertyObjects that float in water have a density have less than 1 g/mLTo know more about density visit :
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How many electrons can fill all the p orbits from n = 1 through n = 3?
A.3
B.18
C.12
D.6
the correct option is c = 12 electrons.
There are fours quantum numbers
1) Principal Quantum Number (n)
The 'n' represent the shellit also tells the size of an orbitals.2) Azimuthal Quantum Number (L)
The 'L' represent the subshells.L = n-1 , It means the shell divides into the smaller groups called orbitals.l 0 1 2 3 4 5 Orbitals s p d f g h3) Magnetic Quantum Number (ml)
ml = -l, 0, +lIt tells the orientations of orbitals.This number divides the subshell into the orbitals which holds the electrons = 2l+1.using the above information ,
4) If n= 1
L = N-1
L = 1-1 =0
'0' represent the S orbital.
each orbital can hold hold only two electrons.
The number of orbital is = 1S
4) If n= 2
L = n-1
L = 2-1
L = 1
m = -L , 0 , +L
M = +1 , 0 , -1
The number of orbitals is = 1s , 2s and 2p (Only two orbitals.)
each orbital can have only two electrons , S orbital contains two electrons and 2p (2px, 2py,2pz)= 6 electrons.
5) If n=3
L= n-1
L = 3-1= 2
L = 0,1,2
number of orbitals = S, P,D
m = -2,-,1,0,1,2
The number of orbitals are = 1S ,2S,2p, 3p ,4d
3p contains the electrons = 6 electrons.
So the number of electrons contains in p orbital from n=1 to n= 3 is 0+6+6= 12 electrons.
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What is the name of the person who sings or chants a solo line in the style of call and response?
A. Call Leader
B. Melody Singer
C. Solo Singer
D. Song Leader
How many moles of KBr are present in 150 mL of a 0.122 M solution?
The number of moles of KBr present in 150 mL of a 0.122 M solution is 0.0183mol.
How to calculate number of moles?The number of moles in a solution can be calculated by multiplying the molarity of the solution by the volume as follows:
no of moles = molarity × volume
Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution. It is the most common way to express the concentration of a solution.
According to this question, there are 150 mL of a 0.122 M pottasium bromide (KBr) solution, the number of moles in this solution can be calculated as follows;
no of moles = 150mL/1000 × 0.122M
no of moles = 0.0183mol
Therefore, the number of moles of KBr present in 150 mL of a 0.122 M solution is 0.0183moles.
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Correct.
How many grams of iron are needed to combine with 25.7 g of O to make Fe₂O3?
The correct answer is 48.36 g .
A mole of any material is equal to 6.023 x 1023, or Avogadro's number. Additionally, it is employed to express concentrations in terms of moles per litre or molecular weight.
Number of moles of O = (Mass of O / Molar mass of O) = ( 25.7 g / 15.999 g/mol) = 1.6 mol
3 mol of O combine with 2 mol of Fe (iron) to form Fe2O3 . Or, 1 mol of O combines with (2/3) mol of Fe.
Therefore, 1.6 mol of O combine with = (2/3) × 1.3 = 0.866 mol of Fe
Mass of Fe (iron) = (Number of moles of Fe) × (Molar mass of Fe) = (0.866 mol) × (55.845 g/mol) = 48.36 g
Hence, the amount of iron required = 48.36 g
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6. Explain the movement of thermal energy when cans of warm soda are covered with ice.
Also explain what happens to the temperature of the soda cans and what happens to the ice.
The temperature of the can reduces and it turns into ice and the thermal energy is exchanged between the walls.
Any residual gas molecules will also cool in the cold water, which reduces their kinetic energy and lessens the number of times they collide with the can's walls. As a result, the pressure inside the can is reduced. The can collapses because the air pressure outside is greater than the air pressure inside.The cold water will also chill any gas molecules that are still there, lowering their kinetic energy and reducing the number of times they will collide with the can's walls. The pressure inside the can is reduced as a result. The can collapses because of the difference in air pressure between the outside and inside of the can.To learn more about air pressure visit:
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Fill in the blanks. 1. A(n). is a way of showing the chemical formulas and symbols of the substances that react and form in a chemical reaction. 2. The "before" and "after" parts of a chemical reaction are separated by a(n) in the chemical equation. 3. In any chemical reaction, the total not change, no matter what new products form. of the substances does
1-chemical equation.
2-an arrow.
3-only the atoms present in the reactants can end up in the products.
What is a basic chemical equation?The initial compound(s)—the reactants—and the final compound(s)—the products—are separated by an arrow in a chemical equation. The overall charge and the number of atoms in each element are equal on both sides of a balanced chemical equation.
What constitutes balancing a chemical equation in four steps?Step 1: Set Up a Table. Subscripts and coefficients are both present in chemical equations.
Step 2: Determining and Balancing the First Element. Pick an element that appears in one molecule on the left side and in one molecule on the left.
Step 3: Balancing Hydrogen.
Step 4: Balancing Oxygen..
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help me pleaseeeeeeee
Answer:
Solid and lipid element
Sequence
5. How is a mechanical
wave produced?
A wave is produced
when something
Each
produces a wave.
Waves keep
moving even
after the
stops.
A disruption or vibration in matter, whether solid, gas, liquid, or plasma, is what generates mechanical waves.
How does a mechanical wave work?Mechanical waves are caused by a disruption or vibration in matter, whether it is solid, gas, liquid, or plasma.Mechanical waves are waves that travel through a solid, liquid, or gas at a rate determined by the elastic and inertial properties of the medium. Mechanical waves, which are the two most common wave motions, can move in either longitudinal or transverse directions. The transmission of energy through a medium is caused by an oscillation of matter known as a mechanical wave. The transmission medium limits the distance a wave can travel. There is almost no translational motion in this case, and the oscillating material rotates around a fixed point.To learn more about : mechanical wave
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Find volume, mass and density of object?
Given 30.30 grams and 30.32 grams
The volume of object is 0.99 L
Here, the given mass of the object is 30.30g
Given density of the object is 30.32g/L
Density = Mass / volume
⇒ volume = mass/density
=30.30g / 30.32g/L
=0.99 L
Density is the measures how tightly a material is packed together.
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C5H12 + O2 CO2 + H2O If the molar mass of pentane is 72 g/mol, how many kilograms of carbon dioxide will be created when 9.28 kilograms of pentane combust?
The mass of the CO2 28.4 Kg.
What is combustion?The term combustion refers to burning. When a material is combusted, the material is made to burn in oxygen. This in itself is an oxidation reaction. It is common that we have to burn the alkanes and some other kinds of hydrocarbons for the process of obtaining energy.
In this case, we can see that the substance that we have to burn is pentane. The reaction equation is written in the manner; C5H12+8O2→6H2O+5CO2.
Number of moles of pentane = 9.28 * 10^3 g/ 72 g/mol
= 128.9 moles
Now;
If 1 mole of pentane produces 5 mols of CO2
128.9 moles of pentane would produce 128.9 moles * 5 mols/ 1 mole
= 644.5 moles of CO2
Mass of CO2 produced = 644.5 moles of CO2 * 44 g/mol = 28.4 Kg
Hence, we have about 28.4 Kg of CO2 produced
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how do you turn "why do people smoke" into a testable question?
Would barefoot footprints be considered trace or physical evidence?????
Answer:
I would say Physical Evidence.
Explanation:
I am not so sure, so you can look up trace evidence versus physical evidence, and decide what barefoot footprints would fall into.