Answers
Answer:
180 g
Explanation:
At the end of the reaction, the mass is still expected to be 180g this is because in every chemical reaction, mass must be conserved.
According to the law of conservation of mass "in a chemical reaction, matter is neither created nor destroyed".
Bonds are broken and elements rearranged. The mass is thereby constantThe sum of the mass of the reactant is then even equal to the mass of the product derived.Related Questions
Which plate, oceanic or continental, must be more dense? How do you know
this?
Answers
Answer:
Oceanic crust is not only thinner and denser than continental crust, and it is also much younger than it and has a different chemical composition. When magma from the mantle of the earth finds a way up, it comes into contact with water that cools it down quickly
11,12,13,14 please...
Answers
12.C
13. For 13 i would say B but not so sure
14. A
A certain rifle bullet has a mass of 6.45 g. Calculate the de Broglie wavelength of the bullet traveling at 1265 miles per hour. Consult the table of physical constants as needed.
Answers
The de Broglie wavelength of the bullet travelling at 1265 miles per having a mass of 6.45 g is 6.13 x 10⁻³³ m
De Broglie wavelength is the relation between the momentum and mass of an object. It is inversely proportional to its force. The de Broglie wavelength of an object is given by
λ = h
p
where,
λ = De Broglie wavelength
h = Planck's constant
p = momentum = mass x velocity
First, we will convert velocity fro miles per hour to m s⁻¹
Velocity = 1265 miles per hour
1 mile = 1.60 km
1265 x 1.60 = 2024
It is multiplied by 1 to convert into m s⁻¹
60 x 60
It gives = 16.86 m s⁻¹
Mass is converted from gram to kilogram
m = 6.45 g = 0.00645 kg or 6.45 x 10⁻³ kg
The momentum of bullet is p, which is
p = mv
p = 0.00645 kg x 16.86 m s ⁻¹
p = 0.108 kgms⁻¹
λ = h
p
where,
h is planck's constant = 6.63 x 10⁻³⁴ m²kg⁻¹
p is the momentum = 0.108 kgms⁻¹
λ is the de Broglie wavelength
putting the values,
λ = 6.63 x 10⁻³⁴ m²kg⁻¹
0.108 kgms⁻¹
λ = 6.13 x 10⁻³³ m
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Treatment of (2R,3R)-2,2-epoxy-3-methylpentane with aqueous acid results in a ring-opening reaction. Draw structural formulas for the first and second intermediates in this reaction.
Answers
Answer:
Explanation:
In an acid-catalyzed epoxide ring-opening reaction, there is a formation of two intermediate in the reaction. The first stage involves the protonation of oxygen in the epoxide. The stage is followed by the attraction of water molecules onto the more substituted carbon atom in the epoxide ring. The stepwise reaction mechanism can be seen in the image attached below.
A student is doing an experiment that stoichiometry says should produce 34.6 grams of product. The student actually makes 25.2 grams. What is the students percent yield?
Answers
which would get you 73%
if you found my answer helpful pls give brainliest
Percent yield of a reaction is the ratio of actual yield to the theoretical yield multiplied by 100. The percent yield of the reaction with the theoretical yield 34.6 g and actual yield of 25.2 g is 72.8%.
What is percent yield ?Percent yield is used compare the actual yield and theoretical yield of a reaction. It is the ratio of actual yield to the theoretical yield multiplied by 100.
Theoretical yield of a reaction is determined from the balanced chemical equation of the reaction. The actual yield or experimental value must vary from the stoichiometric expectation.
Given the theoretical yield = 34.6 g
actual yield = 25.2 g
percent yield = actual yield/ theoretical yield × 100
= 25.2 g/ 34.6 g × 100 = 72.8 %
Therefore, the percent yield of the reaction is 72.8 %.
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Select all the statements that best describe an atom.
A. contains subatomic particles named the proton, neutron, and electron
B. is the smallest particle of an element that retains its identity in a chemical reaction
C. has no net charge and has a cloud surrounding a dense inner core
D. is the largest particle of an element that retains its identity in a chemical reaction
E. is exactly the same as every other atom and has the same properties
Answers
Answer:
a
Explanation:
contains subatomic particles named the proton,neutron and electron
An atom is the smallest particle of a substance that can take part in a chemical reaction. It is composed of subatomic particles.
The statements that best describe an atom are;
contains subatomic particles named the proton, neutron, and electronhas no net charge and has a cloud surrounding a dense inner coreis the smallest particle of an element that retains its identity in a chemical reactionAtoms of elements are the smallest particle of the element. According to the law of conservation of mass, atoms of elements retain their identity in a chemical reaction.
An atom is composed of a massive inner core having neutrons and protons and then a cloud of charge hovering over this dense inner core.
The atom has no net charge because the number of protons and electrons are exactly equal.
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what would be the reaction mechanism?
Answers
Answer:
ch2coo3 is the reaction of mechanism
Calculate 1.4 + 15 + 7.15 +8.003 using the proper number of significant figures. 32 31.55 O 31.550 31.553 31.6
Answers
The result of the calculation to the proper number of significant figures will be 31.6.
Addition operation to a proper significant figureThere are certain rules guiding significant figures in mathematical operations.
When it comes to performing an addition or subtraction operation, the significant figure of the final answer takes cognizance of the participating number in the operation with the lowest significant figure after the decimal. The number of significant digits is then applied to the final answer, after its decimal.In division of multiplication operations, the figure with the lowest significant digits determines the significant digits of the final answer.Following the first rule:
1.4 + 15 + 7.15 + 8.003 = 31.553
The participating number with the lowest significant digit after the decimal is 1.4 with just one significant digit. Thus, the final answer would be 31.6.
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15.How can a pure sample of barium sulphate be otained from barium carbonate?
Answers
Answer:
Barium carbonate powder is stirred add pulp in the entry, the vitriol that the adds solubility then reaction that makes the transition is filtered and is obtained the barium sulfate filter cake and liquid after the transition.
Which statements are true of the electron cloud model? Check all that apply. It is also known as the planetary model. It is considered the modern atomic model. It describes the probable locations of the electrons. It describes the specific locations of the electrons.
Answers
Answer:
-It is considered the modern atomic model.
-It describes the probable locations of the electrons
Explanation:
edge 2020
The correct answer is:
It is considered the modern atomic model. It describes the probable locations of the electrons.The electron cloud model is another name used to describe the modern wave mechanical model of the atom.
It is the atomic model introduced by Erwin Schrodinger in 1927 based on the principles of quantum mechanics. It was an advancement over the Bohr model of the atom.
In this model, the atomic orbital is described as a region in space where there is a high probability of finding an electron. Hence, the electron is not found in specific orbits according to the Bohr model, rather, we describe the probability of finding the electron. This is the contemporary approach to the study of atomic structure.
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If the equilibrium constant of a given reaction is 8.24, what is the equilibrium constant of its reverse reaction
Answers
Answer:
0.121
Explanation:
for reverse reaction use the receprocal of 8.24
Determine the mass in grams of 6.63 × 10²¹ atoms of chromium. (The mass of one mole of chromium is 52.00 g.)
Answers
Answer:
About 0.573g Cr
Explanation:
What mass of hydrogen atoms are in 187 g of zinc hydroxide: Zn(OH)2 (Mw. 99.43)?
Answers
The mass of H atoms in 187g of zinc hydroxide Zn(OH)₂ is 3.76 gm
Given,
The molar mass of zinc hydroxide = 99.43 g/mol
We have to find the mass of the hydrogen atoms in 187 gm of zinc hydroxide.
Mass of H in 99.43 g of Zn(OH)₂ = 2 gm
Mass of H in 1 g of Zn(OH)₂ = 2 / 99.43
Mass of H in 187 g of Zn(OH)₂ = 0.02 × 187 gm
Or, the mass of H in 187 g of Zn(OH)₂ is 3.76 gm
The molecular mass of any substance tells us the sum of atoms present in the compound. The number of moles can be calculated by the given mass to the molecular mass.
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Which is responsible for producing heat and light from the sun?
wind energy
electrical energy
nuclear energy
chemical energy
Answers
Answer:
nuclear energy
Explanation:
heat and light is due to release of energy due to nuclear fusion in the sun
Answer:
Chemical energy
Explanation:
The smallest part of a molecule is called
A) a compound
B) a solute
C) an insulator
D) an atom
Answers
Answer:
D atom
Explanation:
The smallest particle of a substance that retains the chemical and physical properties of the substance and is composed of two or more atoms
Answer:
an insulator is right answer
Explanation:
i hope it is helpful for you
How do I cook eggs? Please tell me
Answers
please answer this i need this:(
Answers
Answer:
need what?? I would love to help though!
Answer:
Explanation:
IN order for us to help you, we would like to know the question.
cite specific situation that you experienced at home or in school where magnet used to seperate mixtures?
Answers
Answer:
See explanation
Explanation:
On a certain day, our teacher came to class with a container having some salt, some sand and a few pieces of iron in it. She was about to introduce a lesson on separation of mixtures.
Then she held a large bar magnet close to the mixture and shook it, the pieces of iron were attracted by the magnet and separated from the mixture.
Next, she poured some water into the mixture and the salt dissolved. She got a filter paper and separated the solution from the sand.
Then she heated the solution to dryness in an open crucible and the salt was recovered.
PLEASE HELP
This picture represents a model of:
Question 5 options:
Oxygen
Calcium
Boron
Neon
Answers
Answer:
The picture represents oxygen.
Explanation:
There are two notable ways you can figure this out:
1) Since there are eight protons, you can automatically know that you are looking for an element with an atomic number of 8. This is because the atomic number is the number of protons in an atom.
2) You can also note the number of electrons on the outer shell. These are called valence electrons. You can then see that the element has 6 valence electrons. Beginning with Lithium on the periodic table and count by ones going from left to right in period 2 of the periodic table until you get to 6. What element is that? It is indeed oxygen.
Answer:
Oxygen
Explanation:
Neons contain 8 protons and 10 ELECTRONS
Boron contains 5 protons an 5 electrons
calcium contains 20 electrons an 0 protons
Substance
Specific Heat Capacity
0.290 J/g • °C
Sand
Aluminum
0.902 J/g • °C
Iron
Silver
0.444 J/g • °C
0.240 J/g • °C
0.129 J/g • °C
Gold
1. If 750 g of iron absorbs 22,000 joules, what will the change in temperature be?
Answers
Answer:
ΔT = 66.06°C
Explanation:
Given data:
Mass of iron = 750 g
Heat absorbed = 22000 j
Change in temperature = ?
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
specific heat capacity of iron is 0.444 J/g.°C
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
By putting values,
22000 j = 750 g × 0.444 J/g.°C × ΔT
22000 j = 333 J/°C × ΔT
ΔT = 22000 j /333 J/°C
ΔT = 66.06°C
What type of bond form ionic bonds
Answers
A single atom with a unique number of protons
Answers
Answer:
One atom of that element like helium neon and other Noble gases
Explanation:
Answer:
Please make sure to re-write this on your own so your teacher doesn't think you cheating!Explanation:
The number of protons in the nucleus of an atom determines an element's atomic number. In other words, each element has a unique number that identifies how many protons are in one atom of that element. An example is all hydrogen atoms, and only hydrogen atoms, contain one proton and have an atomic number of 1.
Which two cell components have the same function but for different chemical components?
Question 7 options:
lysosome and peroxisome
vesicles and mitochondria
the Golgi apparatus and the nucleus
ribosomes and mesosomes
Answers
The two cell components that have the same function but for different chemical components are lysosome and peroxisome (option A).
What are lysosomes and peroxisomes?Lysosomes are organelles found in all types of animal cells which contains a large range of digestive enzymes capable of splitting most biological macromolecules.
On the other hand, peroxisomes are intracellular organelle found in all eukaryotes which is the source of the enzymes that catalyze the production and breakdown hydrogen peroxide, and are responsible for the oxidation of long-chain fatty acids.
Lysosomes and peroxisomes are two membrane-bound organelles that perform digestive function, however, they differ in the molecules they break down.
Therefore, the two cell components that have the same function but for different chemical components are lysosome and peroxisome.
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How many grams of nitrogen monoxide are present if 33.7 L of ammonia and 41.3 L of Oxygen are reacted at 296.3 K and 1.26 atm? What is the enthalpy change for the reaction? NH3(g) + O2(g) -> NO(g) + H2O(l)
Answers
Answer:
29.7g of NO are present
Explanation:
With volume, absolute temperature and pressure we can determine moles of ammonia and oxygen that reacts. With these moles we can determine limiting reactant and moles (And mass) of nitrogen monoxide produced as follows:
Moles Ammonia:
PV = nRT
PV/RT = n
1.26atm*33.7L / 0.082atmL/molK*296.3K = 1.748 moles ammonia
Moles Oxygem:
PV = nRT
PV/RT = n
1.26atm*41.3L / 0.082atmL/molK*296.3K = 2.142 moles oxygen
Based on the chemical reaction, 1 mole of NH3 reacts per mole of O2 producing 1 mole of NO.
Thus, limiting reactant is ammonia and moles of NO produced are = Moles of ammonia added = 1.748mol NH3
Mass Ammonia:
1.748mol NH3 * (17g/mol) =
29.7g of NO are presentWhich of the following is an example of pseudoscience?
Biology
Chemistry
Physics
Superstition
Answers
Answer:
superstition
Explanation:
a solution of AICI is combined with a solution of KOH. Identify the precipitate and the spectator ions in the resulting reactions.
Answers
The the precipitate : Al(OH)₃(s)
The spectator ions : 3Cl⁻ and 3K⁺
Further explanationReaction
AlCl₃ + 3KOH → Al(OH)₃ + 3KCl
From solubility rules :
Compounds of OH− are insoluble except Compounds of Li +, Na +, K +, Rb +, Cs +, NH₄⁺ , Sr²⁺, and Ba²⁺
Compounds of Cl−, Br−, I− are soluble except Ag⁺, Hg₂²⁺, Pb²⁺
So the the precipitate : Al(OH)₃(s)
net ionic reaction
AlCl₃ + 3KOH → Al(OH)₃ + 3KCl
Al³⁻+3Cl⁻+3K⁺+3OH⁻⇒Al(OH)₃(s)+3K⁺+3Cl⁻
Remove the spectator : 3Cl⁻ and 3K⁺
Al³⁻(aq)+3OH⁻(aq)⇒Al(OH)₃(s)
pls someone help me when i get this done i am done with my work i will give brainlist to
Heat is often a by-product of an energy transfer, even when it is not intentional. Name one example where heat is an intentional product and one example where heat is not an intentional product of an energy transfer. Use details to support your answer.
Answers
Answer:
well i think coffe is an example cause it goes from hot to cold
Balance the following DECOMPOSITION chemical reaction:
___Al2O3 (s)--> ___ Al (s) + ____ O2 (g)
a
3, 2, 4
b
4, 3, 2
c
4, 2, 3
d
2, 4, 3
Answers
Answer:
d 2,4,3
Explanation:
2 Al2O3 ----> 4 Al + 3 O2
To solve such this we must know the concept of redox reaction. Therefore, the correct option is option D. the balanced decomposition chemical reaction can be given as
2 Al[tex]_2[/tex]O[tex]_3[/tex] [tex]\rightarrow[/tex] 4 Al + 3 O[tex]_2[/tex]
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
Decomposition reaction is a reaction which one reactant breaks down into two or more products in presence of energy in the form of heat or electricity. The balanced decomposition chemical reaction can be given as
2 Al[tex]_2[/tex]O[tex]_3[/tex] [tex]\rightarrow[/tex] 4 Al + 3 O[tex]_2[/tex]
Therefore, the correct option is option D. the balanced decomposition chemical reaction can be given as
2 Al[tex]_2[/tex]O[tex]_3[/tex] [tex]\rightarrow[/tex] 4 Al + 3 O[tex]_2[/tex]
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Identify the intermediate leads to the major product for the reaction of 2-methyl-2-butene with hydrogen bromide in the presence of peroxide.
Answers
Answer:
II
Explanation:
We must have a good idea of the fact that there are two mechanisms that come into play when we are discussing about the addition of hydrogen halides to alkenes. The first is the ionic mechanism and the second is the radical mechanism.
The ionic mechanism is accounted for by the Markovnikov rule while the radical mechanism occurs in the presence of peroxides and is generally referred to as anti Markovnikov addition.
The intermediate in anti Markovnikov addition involves the most stable radical, in this case, it is a tertiary radical as shown in the images attached. The most stable radical is II hence it leads to the major product shown in the other image.
Determine the frequency of light with a wavelength of 675nm
Answers
Answer:
4.44 x 10^14 Hz
Explanation:
The frequency of light is 0.00148 Hz. This can be determined y using the value of wavelength.
What is Frequency?It is defined as the reciprocal of the wavelength.
Frequency = 1 / wavelength
Given:
Wavelength = 675 nm
To find:
Frequency=?
On subsituting the values:
f= 1/ 675 nm
f=0.00148 Hz
Thus, the frequency of light is 0.00148 Hz.
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