Answer: A. 5.41
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} Al=\frac{2.50g}{27g/mol}=0.0926moles[/tex]
[tex]\text{Moles of} Pb(NO_3)_2=\frac{8.65g}{331g/mol}=0.0261moles[/tex]
[tex]2Al(s)+3Pb(NO_3)_2(aq)\rightarrow 3Pb(s)+2Al(NO_3)_3(aq)[/tex]
According to stoichiometry :
3 moles of [tex]Pb(NO_3)_2[/tex] require = 2 moles of [tex]Al[/tex]
Thus 0.0261 moles of [tex]Pb(NO_3)_2[/tex] will require=[tex]\frac{2}{3}\times 0.0261=0.0174moles[/tex] of [tex]Al[/tex]
Thus [tex]Pb(NO_3)_2[/tex] is the limiting reagent as it limits the formation of product and [tex]Al[/tex] is the excess reagent.
As 3 moles of [tex]Pb(NO_3)_2[/tex] give = 3 moles of [tex]Pb[/tex]
Thus 0.0261 moles of [tex]Pb(NO_3)_2[/tex] give =[tex]\frac{3}{3}\times 0.0261=0.0261 moles[/tex] of [tex]Pb[/tex]
Mass of [tex]Pb=moles\times {\text {Molar mass}}=0.0261moles\times 207g/mol=5.41g[/tex]
Thus 5.41 g of solid lead will be produced from the given masses of both reactants.
Liquid waste is held in the bladder until the bladder sends sensory information to the brain to let the brain know that the bladder is full. The brain controls the release of this waste. This is an example of the A respiratory system working with the circulatory system. B circulatory system working with the skeletal system. C endocrine system working with the reproductive system. D nervous system working with the excretory system.
Answer:
Option D is correct
Explanation:
Nervous system is the network of nerve cells and fibres. This system helps to transfer nerve impulses among various parts of the body.
The excretory system performs the function of excretion and helps in discharging wastes.
The brain controls the release of the waste from the bladder. This is an example of the nervous system working with the excretory system.
I need help fast!!! Fill in the coefficients
Answer:
2HCl - H2 + Cl2
Explanation:
The two hydrochloric acid molecules decompose into one hydrogen molecule (H2) and one chlorine molecule (Cl2). If there is only one type of a specific molecule present, you should not have to add a coefficient of 1 behind it.
Most molecules in life are made up of complex molecules based around which of the following type of atoms?
Nitrogen
Carbon
Oxygen
Helium
Answer:
Carbon is the answer. hope that helped
What is the ground-state electron configuration of chlorine and the number of valence electrons in it?
Explanation:
Chlorine is an element in group 7 on the periodic table.
It is the second element in this group of halogens
The element has a total of 17 electrons:
Ground state configuration = 1s² 2s² 2p⁶ 3s² 3p⁵
Valence electrons are the outermost shell electrons;
From the configuration: 3s² 3p⁵ is the valence shell
Number of electrons = 2 + 5 = 7
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What happens to the binding energy of lighter elements when they undergo fusion?
What is the most stable nucleus (the one with the highest binding energy)?
What happens to the binding energy of elements like uranium when they undergo fission?
Why does the fusion of elements beyond iron in our universe require a supernova? Use this diagram to explain your answer.
Answer:
.
Explanation:
Answer:
1) In fusion reactions, two light atomic nuclei fuse together to form a heavier nucleus. In doing so, they release a comparatively large amount of energy that arises from the binding energy, creating an increase in temperature of the reactants.
2) iron-56
3) When a large, fissile atomic nucleus such as uranium-235 or plutonium-239 absorbs a neutron, it may undergo nuclear fission. However, one neutron does collide with an atom of uranium-235, which then splits and releases two neutrons and more binding energy.
4) Iron cannot release energy by fusion because it requires a larger input of energy than it releases. This energy blows the outer layers of the star off into space in a giant explosion called a supernova (plural: supernovae.)
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How many molecules are in 5.06L of oxygen gas?
You and your lab group have been asked to design an investigation to determine the effects of heat transfer between two different objects.
Which of the following investigation designs explains the heat transfer when atoms directly touch?
А
Boiling water, in a pan, sitting on a lit Bunsen burner.
B
Boiling water, in a pan, in front of a lit Bunsen burner.
С
Hands warming in front of a lit Bunsen burner.
D
Hands touching the handle of pan sitting on a lit Bunsen burner.
The investigation designs that explain the heat transfer when atoms directly touch have been the hand touching the handle of the pan sitting on the lit bunsen burner. Thus, option D is correct.
Heat has been the energy that can neither be created nor destroyed. The heat energy can be transferred from one body to another with the transfer of atomic energy.
The atoms of an object gaining energy start to vibrate and transfer the energy to another atom that is in close proximity to the vibrating atoms.
The boiling of water in a pan by sitting it onto the bunsen burner has been an example of the transfer of heat energy. The heat energy of the burner has been transferred to the atoms of the pan that resulting in the boiling of the water in the pan. It has been the transfer of energy in an object.
By touching the pan, the energy of the pan has been transferred to the body. Thus the transfer of energy takes place between two different objects.
Thus, the example of heat transfer between two different objects has been the transfer of energy from the bunsen burner to the pan, and from touching the pan by hands, the energy has been transferred to the hands, Thus, option D is correct.
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a homogeneous mixture has the same composition throughout, while a heterogeneous mixture has different compositions in different regions.
This is the difference between a homogeneous and a heterogeneous mixture.
For example, salt (NaCl) and water make a homogeneous mixture (the same proportions of its components throughout any given sample), because both substances are polar.
A solution is homogeneous mixture composed of two or more substances.
In aqueous solution, a solvent is water and solute (in this example sodium chloride) is a substance dissolved in water.
A heterogeneous mixture is not uniform in composition (in this mixture different metals and minerals), but proportions of its components (for example mixture particles of different colors, small pebbles) vary throughout the sample.
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Is Sucrose a ionic or covalent bond
Answer:
covalent bond
Explanation:
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Identify each of the reactions as synthesis (S), decomposition (D), combustion (C), single replacement (SR) or double replacement (DR).
Identifying each reaction with their correct term
Reaction A Synthesis ( S )Reaction B Double replacement ( DR )Reaction C Decomposition ( D )Reaction D Single replacement ( SR )Reaction E Double replacement ( DR )Reaction F Single replacement ( SR )Reaction G Synthesis ( S )Reaction H DecompositionReaction I Synthesis ( S )Reaction J Single replacement ( SR)What is double replacement reactionA double replacement reaction is a type of chemical reaction whereby two reactants exchanges its ions ( cations or anions ) to produce two new products. It can also known as a double displacement reaction. while a single replacement reaction leads to the substitution of one element for another in chemical compound.
Hence we can conclude that the answers to your questions are as listed above.
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Planets that orbit closer to the Sun than Earth have ____ years than we do.
Answer:
Well, it depends on where they are orbiting! Planets that orbit closer to the Sun than Earth have shorter years than Earth. Planets that orbit farther from the Sun than Earth have longer years than Earth.
Write the complete and net ionic equation for the following reaction:
Al2(SO4)3(aq) + Mg(OH)2(aq) → MgSO4(aq) + Al(OH)3(s)
Answer:
Al2(SO4)3 + 3Mg(OH)2 → 2Al(OH)3 + 3MgSO4
Explanation:
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How many grams are in 3.01 x 1024 molecules of H2SO4
Answer:
490. g H₂SO₄
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
3.01 × 10²⁴ molecules H₂SO₄
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of H - 1.01 g/mol
Molar Mass of S - 32.07 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of H₂SO₄ - 2(1.01) + 32.07 + 4(16.00) = 98.09 g/mol
Step 3: Convert
[tex]3.01 \cdot 10^{24} \ molecules \ H_2SO_4(\frac{1 \ mol \ H_2SO_4}{6.022 \cdot 10^{23} \ molecules \ H_2SO_4} )(\frac{98.09 \ g \ H_2SO_4}{1 \ mol \ H_2SO_4} )[/tex] = 490.287 g H₂SO₄
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
490.287 g H₂SO₄ ≈ 490. g H₂SO₄
which of these waves cannot travel through the vacume of space
a. microwaves
b. radio waves
c. light waves
d. sound waves
Answer
the answer is sound waves have a nice night
Explanation:
Answer:
sound waves
Explanation:
Sound can't travel in space
_Cl2 + _NaBr → _NaCl + _Br2
Answer: 1,2,2,1
Given the unbalanced equation below, answer the following: Calculate the number of liters of 3.00 M lead (II) iodide solution produced when 1.66 mol Kl react?
Pb(NO3)2 + 2KI → 2KNO3 + PbI2
The number of liters of 3.00 M lead (II) iodide : 0.277 L
Further explanationReaction(balanced)
Pb(NO₃)₂(aq) + 2KI(aq) → 2KNO₃(aq) + PbI₂(s)
moles of KI = 1.66
From the equation, mol ratio of KI : PbI₂ = 2 : 1, so mol PbI₂ :
[tex]\tt \dfrac{1}{2}\times 1.66=0.83[/tex]
Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution
[tex]\large \boxed {\bold {M ~ = ~ \dfrac {n} {V}}}[/tex]
Where
M = Molarity
n = Number of moles of solute
V = Volume of solution
So the number of liters(V) of 3.00 M lead (II) iodide-PbI₂ (n=0.83, M=3):
[tex]\tt V=\dfrac{n}{M}\\\\V=\dfrac{0.83}{3}\\\\V=0.277~L[/tex]
Which is a pure substance? air nitrogen apple juice tap water
Answer:
A Pure substance cant be broken down in any way. Nitrogen cant be broken down any further
Explanation:
Air is a mixture of gasses
Juice and be reduced to sugars
Tap water can be boiled into vapor
Answer: Air nitrogen. Elements and compounds are the two types of pure substances. Examples of common elements include carbon, nitrogen and hydrogen. They consist of one type of atom and cannot break down into something else. ... Compounds such as water, salt and sugar are also pure substances.
Explanation:
Lets say a giant radioactive monster is attacking
Phoenix. This monster is so radioactive and big the air in
Feels easily over 120°. Is this an endothermic or
exothermic reaction?
Answer: exothermic reaction
The monster is releasing heat energy to the environment surrounding it. The term "exo" means "outside".
In contrast, an endothermic reaction is one where energy is absorbed from the environment to cool down the surrounding air.
Is a gummy worm increased by two inches a qualitative or quantitative
Answer:
quantitative
Explanation:
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1. Examples of pure substances are
elements and _____.
O mixtures
O compounds
Answer: Examples of pure substances include iron, aluminum, silver, and gold. Mixtures: Substances that have two or more different particles are mixtures. Examples of mixture include the salt solution which is a 'mixture' of two components, salt, and water.
Explanation:
which chemical equation represents a redox reaction?
Answer:
B if i'm not mistaken.
Explanation:
The two liquids of the mixture having the same boiling point cannot be seperation of distillation Explain.
Answer:
True
Explanation:
Two liquids of a mixture having the same boiling point cannot be separated using the process of distillation.
Distillation is one of the process of physical separation techniques.
It relies on physical property called the boiling point. In a fractionating column, a mixture is heatedAs the boiling point of the each component compound in the mixture is reached, the compound rises up within the column.So without a difference in the boiling point of the compound that makes up a mixture, the separation by distillation will not be possible.
measuring carbon dioxide burning fuels in power plants and motor vehicles emits carbon dioxide, which may continue to global warming
A major contributor to global warming is the usage of personal vehicles. For every gallon of gas, vehicles and trucks generate about 24 pounds of carbon dioxide and other greenhouse gases, making up approximately one-fifth of total US emissions.
Our national security is under risk, and other fundamental human necessities are also threatened by global warming. Some effects, like as extreme flooding and droughts, rising sea levels, and record-high temperatures, are already happening more frequently.A major contributor to global warming is the usage of personal vehicles. For every gallon of gas, vehicles and trucks generate about 24 pounds of carbon dioxide and other greenhouse gases, making up approximately one-fifth of total US emissions. The extraction, manufacture, and distribution of the fuel account for about five pounds, whereas the majority of heat-trapping emissions—more than 19 pounds per gallon—come directly from a car's tailpipe. Vehicles that are more fuel-efficient require less fuel to cover the same distance as their inefficient counterparts. Less fuel consumption results in fewer emissions.CO2 emission leads to global warming.
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Base your answer on the information below and on your knowledge of chemistry.
Two very stable compounds, Freon-12 and Freon-14, are used as liquid refrigerants. A Freon-12 molecule consists of one carbon atom, two chlorine atoms, and two fluorine atoms. A Freon-14 molecule consists of one carbon atom and four fluorine atoms.
To which class of organic compounds do Freon-12 and Freon-14 belong?
At constant temperature, the behavior of a sample of a real gas more closely approximates that of an ideal gas as its volume is increased because the.
At constant temperature, the behavior of a sample of a real gas more closely approximates that of an ideal gas as its volume is increased because there is an increase in the average distance between the molecules.
In chemistry, real gas does not obey gas laws under all conditions of pressure and temperature.
On the other hand, an ideal that obeys gas laws has negligible interaction and space among the molecules.
For an ideal gas, if the temperature is kept constant then the average speed and kinetic energy of the molecules remain unchanged.
Neither the size of molecules changes.
Under such conditions, it can be concluded that the ideal gas does not expand and its volume remains the same.
However, the distance between molecules increases for a real gas as its molecules expands under different temperatures and volume increases.
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If someone gave you flour, sugar, butter, eggs, baking soda, and salt, what could those ingredients turn into?
Answer:
You can make Cake CAke Cake Cake and other stuff too Ig
Explanation:
What is Atomic Radius
Answer:
Atomic Radius can be simply defined as the distance between the last shell of electrons and the nucleus of an atom.
Answer: The atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding shells of electrons. Illustrated Glossary of Organic Chemistry - Atomic radius. Atomic radius: The radius of an atom. This distance between an atom's nucleus and outer electron shell. ... Atomic radius differs with the bonding state of an atom (for example a nonbonded atom of an element versus the same element within a covalent bond). Atomic radius is determined as the distance between the nuclei of two identical atoms bonded together. The atomic radius of atoms generally decreases from left to right across a period. The atomic radius of atoms generally increases from top to bottom within a group.
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Given the nuclear equation:
232U + In → Ba + Kr + 3}n + energy
28.
State the type of nuclear reaction represented by the equation.
Answer:
Nuclear fission
Explanation:
Even though the equation is not too clear, however, we can see that the uranium nucleus was bombarded with a particle leading to its disintegration to yield other nuclides.
A nuclear fission reaction is one in which a heavier nuclide is bombarded with a particle (usually a neutron) leading to the disintegration of that nuclide into other nuclides with the release of tremendous energy. More neutrons are released in the process to continue the reaction. Hence, it is a chain reaction.
Beth has a one-day-old baby daughter. When Beth puts her finger in the baby’s hand, the baby grasps her finger. Which statement best describes why the baby grasps Beth’s finger?
A.) The baby’s reflex to grab is an innate behavior.
B.) The baby’s visual memory recognizes Beth’s finger.
C.) The baby is a day old and has learned to reach for Beth.
D.) The baby’s homeostatic response is to touch objects that are warm
Answer:
The baby`s reflex to grab is an innate behavior.
It`s not B because if the baby is 1 day old it`s not going to 'remember'.
It`s not C because it hasn`t really 'learned' anything.
It`s not D because babies can`t sense heat like a snake or something. -_-
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The statement which statement best describes why the baby grasps Beth’s finger is that it is a reflex to grab is an innate behavior.
What is reflex?
In biology, a reflex, or reflex action, is an involuntary, unplanned sequence or action and nearly instantaneous response to a stimulus.
The simplest reflex is initiated by a stimulus, which activates an afferent nerve. The signal is then passed to a response neuron, which generates a response.
Reflexes are found with varying levels of complexity in organisms with a nervous system. A reflex occurs via neural pathways in the nervous system called reflex arcs. A stimulus initiates a neural signal, which is carried to a synapse. The signal is then transferred across the synapse to a motor neuron, which evokes a target response. These neural signals do not always travel to the brain,so many reflexes are an automatic response to a stimulus that does not receive or need conscious thought.
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