Answer:
.
Explanation:
Fe(s) + S(s) → FeS(s)
In one experiment, 7.62 g of Fe are allowed to react with 8.67 g of S.
What is the limiting reagent, and what is the reactant in excess?
Calculate the mass of FeS formed.
The mass of FeS formed : 11.97 g
Further explanationReaction
Fe(s) + S(s) → FeS(s)
mass Fe=7.62 g
mol Fe(MW=56 g/mol) :
[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{7.62}{56}\\\\mol=0.136[/tex]
mass S=8.67 g
mol S(MW=32 g/mol) :
[tex]\tt mol=\dfrac{8.67}{32}=0.271[/tex]
Limiting reactant : smaller ratio(mol:coefficient) ⇒coefficient=1
Fe : S =0.136 : 0.271⇒Fe limiting(smaller), S excess
Mol FeS based on Fe , so mol FeS=0.136
Mass FeS(MW=88 g/mol) :
[tex]\tt mass=mol\times MW\\\\mass=0.136\times 88=11.97~g[/tex]
Why does a bronze bell sound better than a tin bell?
Rutherford tested the ____________ atomic model by experimentation and found that it was _____________.
a. Nuclear; correct
b. Bohr; correct
c. Plum Pudding; incorrect
d.Dalton; incorrect
Answer:
C Plum Pudding; incorrect
Explanation:
Ernest Rutherford tested it through his famous gold foil experiment and found that it was incorrect.
Write the full electron configuration for a neutral atom with 22 electrons.
Answer:
1s2 2s2 2p6 3s2 3p6 3d2 4s2
Explanation:
how many moles of h2o are produced when 3.25 moles of o2 react in 2c2h6 + 7o2 ---> 4co2 + 6h2o
Answer:
2.78 moles of water are produced.
Explanation:
Given data:
Number of moles of H₂O produced = ?
Number of moles of oxygen react = 3.25 mol
Solution:
Chemical equation:
2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O
Now we will compare the moles of water with oxygen.
O₂ : H₂O
7 : 6
3.25 : 6/7×3.25 = 2.78 mol
When should you avoid looking directly at magnesium burning?
Answer:
Magnesium also reacts with nitrogen in the air to produce some magnesium nitride (Mg3N2). Safety: Do not look directly at the burning magnesium due to the intensity of the light. A dry-powder fire extinguisher should be available. Disposal: Once cooled the solid magnesium products can be thrown in the trash.
Explanation:
An 85.0 kg patient being treated for a serious infection is to receive an iv infusion of 1 /mg kg gentamicin, a powerful antibiotic. the pharmacy has prepared a 250. ml iv bag of normal saline in which 0.500 g of gentamicin has been dissolved. what is the total volume of the iv solution that should be given to the patient? round your answer to the nearest ml
Answer: 1/ms=8mk
Explanation:
What is the wavelength of a wave having a frequency of 3.23 x 10^14 s-1
Answer:
λ =0.93×10⁻⁶ m
Explanation:
Given data:
Wavelength of wave = ?
Frequency = 3.23 ×10¹⁴ s⁻¹
Solution:
Formula:
Speed of wave = frequency × wavelength
speed of wave = 3×10⁸ m/s
by putting values,
3×10⁸ m/s = 3.23 ×10¹⁴ s⁻¹ × λ
λ = 3×10⁸ m/s / 3.23 ×10¹⁴ s⁻¹
λ =0.93×10⁻⁶ m
Which statement describes what happens in a chemical reaction?
Answer: pic
Explanation:
plz
Answer:
4. matter is neither created nor destroyed
Explanation:
The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 discovery that mass is neither created nor destroyed in chemical reactions. In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.
If an ice cube is melting identify the property of the substance that is change.
If an ice cube is melting, its shape and state of matter changes from solid to liquid, while its chemical composition remains the same. Hence, it is a physical change.
When an ice cube melts, only the physical property of the ice cube changes. No new substances are formed, and the chemical composition of the ice does not change, making it a physical change.
A physical change occurs only the physical properties of the substance like colour, shape, density and solubility changes. It is easily reversible. The melted ice can easily be re-frozen back to its solid state. Also, the melting process does not produce any new chemical substance.
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Cleaning agents are complex mixtures of chemical components, each with its own specific purpose. The components have very precise measurements to ensure that the cleaning agent has the right properties. What is a cleaning agent an example of? (Hint: it's a type of mixture).
The components have very precise measurements to ensure that the cleaning agent has the right properties which means it is an example of a homogeneous mixture.
What is homogeneous mixture?
A mixture is referred to as a substance which comprises of two or more different chemical substances which are not chemically bonded and are of two types which are:
Homogeneous mixture.Heterogeneous mixture.The homogeneous mixture is a type of mixture in which there is the same or uniform proportions of its components in the sample while heterogeneous mixture doesn't have a uniform proportion.
In this scenario, we were told that the components have very precise measurements with the right properties which depicts a homogeneous mixture and is the correct choice.
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Please help will mark the brainliest.
Answer:
A 1.69%
i hope its right i worked it out
Calulate the maximum mass of copper that could be obtained from 79.5g of copper oxide
Answer:
63.5 copper
Explanation:
You have the balanced equation: CuO + H2 --> Cu + H2O. You can use stoichiometry and see there is a 1:1 molar ratio between CuO and Cu.
1) work out the moles of CuO.
- mol=mass/mol mass = 79.5g/(63.5+16.0) = 1 mol CuO
2) work out mol Cu
- from the 1:1 mol ratio you know if you have 1 mol CuO you must have 1 mol Cu. So mol Cu=1 mol
3) work out mass of Cu
- mol=mass/mol mass therefore mass= mol x molar mass = 1 x 63.5g/mol-1 = 63.5g Cu
Which phrase best describes earths atmosphere
A. A single layer of gases surrounding earth
B. multiple layers of gases surrounding earth
C. A bubble of air close to the surface of earth
D. Clouds and particles in a single layer around earth
Answer:
b
Explanation:
Earth's atmosphere is composed of multiple layers of gases surrounding earth. So the correct option is B.
What is the atmosphere?The atmosphere of Earth extends from the planet's surface up to 10,000 kilometres (6,214 miles) above. Following that, the atmosphere disappears into space. Although there is disagreement among scientists on the location of the atmosphere's upper border, most of them can agree that the atmosphere's majority is found near the planet's surface, up to a distance of around eight to fifteen kilometres (five to nine miles).
While most life on Earth requires oxygen, oxygen does not make up the bulk of the planet's atmosphere. About 78% of the gases in the Earth's atmosphere are nitrogen, 21% are oxygen, 0.9 % are argon, and 0.1 % are other gases. The remaining 0.1 per cent of gases includes trace quantities of neon, water vapour, methane, carbon dioxide, and methane.
Based on temperature, the atmosphere is separated into five distinct strata. The troposphere, which is located between five and ten miles (or seven and 15 kilometres) above Earth's surface, is the layer that is closest to the surface. The troposphere is significantly thinner near the North and South Poles than it is at the equator. The troposphere, which makes up between 75 and 80 per cent of the total atmosphere, is where the majority of its mass is located.
Therefore the correct option is B.
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Write one equation each for the decomposition reactions where energy is supplied in the form of (a) electricity and
Answer:
Electrolysis of water
Explanation:
The electrolysis of water is a decomposition reaction in which electricity is used to break down a compound into simpler molecules.
Decomposition of water is carried out in the Hofman Voltameter.
This process is achieved by passing current through an acidified water.
The expression is given as:
2H₂O → 2H₂ + O₂
How many grams of calcium are made up by 2.68 x 1023 atoms?
Answer:
Mass = 17.8 g
Explanation:
Given data:
Number of atoms of Ca = 2.68 × 10²³
Mass in gram = ?
Solution:
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
2.68 × 10²³ atoms × 1 mole /6.022 × 10²³ atoms
0.445 mol
Mass in gram;
Mass = number of moles × molar mass
Mass = 0.445 mol × 40 g/mol
Mass = 17.8 g
Which end of the H-F molecule will be partially positive?
neither end
the fluorine end
both ends
the hydrogen end
Answer:
the hydrogen end
Explanation:
In H - F molecules there is a charge separation. Hydrogen has partial positive charge on them and Fluorine has a partial negative charge on it.
The bonds between H - F molecule is a covalent bond. In this bond, both atoms share their electrons to attain a stable configuration But the electrons are not shared equally. Fluorine is more electronegative compared to the hydrogen. Fluorine therefore, attracts the shared electrons more closely to itself. This makes fluorine more negative and hydrogen positive.PLZZ HELP QUICK WORTH 20 POINTS IM NOT JOKING PLZZZ
The events taking place in two different locations are described below:
Location A: An oceanic plate collides with a continental plate
Location B: Lithospheric plates move apart below the ocean
In which location will subduction most likely take place and why?
Location B, because divergent plates cause subduction
Location B, because seafloor spreading causes subduction
Location A, because the oceanic plate and continental plate are pushed up together
Location A, because the lighter oceanic plate will be pushed under the continental plate
Answer:
is a
Explanation: A, because the oceanic plate and continental plate are pushed up together
Location A, because the lighter oceanic plate will be pushed under the continental plate
Answer:
is a
Explanation:
Answer:
location A
Explanation:
Plates Subduct When an ocean plate collides with another ocean plate or with a plate carrying continents, one plate will bend and slide under the other. This process is called subduction. A deep ocean trench forms at this subduction boundary.
plus location B doesn't seem to have 2 plates colliding to cause subduction in the first place.
your welcome
Green energy may also be referred to as renewable or clean energy.
True
False
Use the periodic table to choose the element that matches each description.
halogen:
group IIA:
nonreactive:
alkali metal:
Halogen-fluorine,chlorine,bromine,iodine
Group II A- Beryllium,magnesium,calcium,strontium ,barium ,radium
Non-reactive- Helium,neon,argon,krypton,xenon,radon
Alkali metal-lithium ,sodium,potassium,rubidium,caesium,francium.
What is periodic table?It is a representation of chemical elements in a tabular format.It is a graphical representation of modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.
The periodic table is divided into 4 blocks, rows of the table are called periods and columns are known as groups. Elements belonging to the same group show same properties.
First periodic table developed and accepted was by Russian chemist Dmitri Mendeleev in 1869.He formulated the periodic law as properties of the elements are a periodic function of their atomic masses.
Till date 118 elements have been discovered and all have been successfully placed in the periodic table based on their properties.
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Answer:
Use the periodic table to choose the element that matches each description.halogen:
✔ iodine✔ magnesium
✔ argon ✔ potassium
If I have a 30,000 mL container that holds 65 moles of gas at a temperature of 205 degrees Celsius, what is the pressure inside the container?
Answer:
85.384 atm or 64608.13086 mmHg
Explanation:
PV= NRT
P= NRT/V
n= mols
R= gas constant (i used .0821 for atm)
T= Temp in Kelvins (Celsius degrees + 273)
V= in L
(65molsx480kx.0821)/30L
How many milliliters of a stock solution of 6.20 M HNO3 would you have to use to prepare 0.130 L of 0.470 M HNO3?
Answer:
9.85
Explanation:
M1V1 =M2V2
6.20×v1= 0.470×0.130
v1 = ( 0.470 × 0.130 ) ÷ 6.20
v1 = 0.0098 L × 1000
V1 = 9.8 ml
A block of pine wood, 4.0cm on each side, has a mass of 27g. What is the density of this block?
Density is defined as the mass divided by volume.
Density is also known by the name of viscosity.
Density is denoted by D.
It's unit is basically denoted by kg/m^3.
The density of the block is 0.42 g/cm^3.
The formula of the density is, Density = mass (m) / volume (v)
Now, it is given in the word problem that,
Mass of pine wood = 27g
Volume = 4^3 = 64 cm^3
Thus, Density = 27 g /64 cm^3 = 0.42 g/cm^3.
Hence, the density of the block of pine would be 0.42 g/cm^3
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What Is the atomic mass of the element shown? 14 Si silicon 28.1
A. 56
B. 14
C. 42.1
D. 28.1
Answer:
28.1
Explanation:
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thw table below provides data the length of day for different planets in the solar system
The day length of each planet corresponds to the amount of time it takes to complete which type of motion?
a one rotation of the planet on its as
b one reversal of magnetic poles of the planet
c one revolution of the planet around the Sun
d one orbit of the largest moon of the planet
Answer:
a one rotation of the planet on its axis
Explanation:
The two types of motion that planets undergo are;
1) rotation of the planet about its axis
2) revolution of the planet around the sun.
In every planet there are days as shown in the image attached to the question. However, the length of day in each planet is determined by the time required for the planet to complete one rotation on its axis.
It takes the earth 1 earth day (24 hours) to complete rotation on its axis.
which animal can be both primary and secondary consumers
Homo Sapiens themselves are the primary consumers as they feed on fruits, vegetables, etc.
Also, they are the secondary consumers as they feed on other organisms too like pigs, chickens, etc.
The leading couse of air pollution is
Answer:
Wildfires
Explanation:
what stages would a low mass star pass through in its lifetime
Answer:
Low mass star phases
Explanation:
Helium fuses into carbon, the core of the star collapses. Once this happens, the outer layers become exhausted from the weight and this leads a planetary nebula to be formed from the outer layers. The core of the star remains a white dwarf for some time, but eventually it cools down and evolves to a black dwarf.
Which of the following describes an air mass with the symbol cT?
a.
it is a cold air mass over an ocean
c.
it is a warm air mass over an ocean
b.
it is a warm air mass over a continent
d.
it is a cold air mass over a continent
Please select the best answer from the choices provided
A
B
C
D
Answer:
b
Explanation:
i took the test edg2021
Answer:
b.
it is a warm air mass over a continent
Explanation:
If an isotope has 85 protons, 110 neutrons, and 85 electrons, it has a mass number of what?
Answer:
Mass number = 195
Explanation:
Isotope:
An atom of an element that contain same atomic number but different atomic mass.
The difference in atomic mass is due to the different number of neutrons present, but the number protons and electrons are remain same.
In given isotope of an atom there are 85 protons and 85 electrons while number of neutrons are 110.
The number of electron or number of protons are called atomic number while mass number of an atom is sum of protons and neutrons. The umber of protons and electrons are always equal to make the atom electrically neutral and when an atom loses its valance electron the number of protons increases and thus positive charge increased and atom form cation.
Mass number = number of protons + number of neutrons
Mass number = 85 + 110 = 195