Answer:
94.4g/mol is molar mass of the unknown
Explanation:
Based on the freezing point depression equation:
ΔT = Kf*m*i
Where ΔT is the depression in freezing point (1.87°C)
Kf is freezing point depression constant of water (1.86°Ckg/mol)
And i is Van't Hoff factor (1 for nonelectrolyte solutes)
Replacing:
1.87°C = 1.86°CKg/mol*m*i
1.005mol/kg solvent = m
Using the mass of the solvent we can find the oles of the nonelectrolyte:
1.005mol/kg solvent * 0.4764kg = 0.479moles
Molar mass is defined as the ratio between mass of a substance in grams and moles, that is:
45.2g / 0.479mol =
94.4g/mol is molar mass of the unknownThe rate of decomposition of radioactive radium is proportional to the amount present at any time. The half-life of radioactive radium is 1599 years. What percent of a present amount will remain after 635 years
Answer:
[tex]\% \frac{A}{A_0}=75.9\%[/tex]
Explanation:
Hello!
In this case, since the kinetics of the radioactive decay is assumed to be first-order, it is possible to use the following equation to quantify that change:
[tex]\frac{A}{A_0} =2^{-\frac{t}{t_{1/2}}[/tex]
Thus, given the elapsed time, 635 years, and the half-life, 1599 years, we can compute the fraction of the present amount:
[tex]\frac{A}{A_0} =2^{-\frac{365years}{1599years}\\\\\frac{A}{A_0} =0.759[/tex]
Thus, the percent is:
[tex]\% \frac{A}{A_0}=0.759*100\%\\\\ \% \frac{A}{A_0}=75.9\%[/tex]
Best regards!
Part II: Covalent Bonding 1. Now, you will investigate diatomic molecules, those that are made up of two of the same type of atom. Select 2 fluorine atoms. a. How many valence electrons are in each fluorine atom
Answer:
Seven electrons.
Explanation:
There are seven valence electrons in each fluorine atom because it belongs to halogens. Fluorine atom requires one electron to complete its valence shell to become stable so for that it form both ionic and covalent bonds with different atoms. It makes ionic bond with alkali metals by accepting one electron to complete its valence shell and also make covalent bond by sharing of electrons.
Find the mass ratios and atomic ratios of the following compounds.
PCl3
SbF5
BaCl2
Bal2
CCl4
OsO4
A solution containing 4.15 g of magnesium chloride is added to a second solution containing excess
sodium sulfate. Magnesium sulfate precipitates.
•Calculate the ideal yield of magnesium sulfate
. If actual yield is 3.95 g, calculate percentage yield
1. Eq.:
2. Given:
3. Wanted:
4. Answer:
Answer:
1. 5.24 g
2. 75.4%
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
MgCl₂ + Na₂SO₄ —> MgSO₄ + 2NaCl
Next, we shall determine the mass of MgCl₂ that reacted and the mass of MgSO₄ produced from the balanced equation. This can be obtained as follow:
Molar mass of MgCl₂ = 24 + (35.5×2)
= 24 + 71
= 95 g/mol
Mass of MgCl₂ from the balanced equation = 1 × 95 = 95 g
Molar mass of MgSO₄ = 24 + 32 + (16×4)
= 24 +32 + 64
= 120 g/mol
Mass of MgSO₄ from the balanced equation = 1 × 120 = 120 g
SUMMARY:
From the balanced equation above,
95 g of MgCl₂ reacted to produce 120 g of MgSO₄.
1. Determination of the ideal yield of magnesium sulfate, MgSO₄.
From the balanced equation above,
95 g of MgCl₂ reacted to produce 120 g of MgSO₄.
Therefore, 4.15 g of MgCl₂ will react to produce = (415 × 120)/95 = 5.24 g of MgSO₄.
Thus, the ideal yield of magnesium sulfate, MgSO₄ is 5.24 g
2. Determination of the percentage yield.
Actual yield of MgSO₄ = 3.95 g
Ideal yield of MgSO₄ = 5.24 g
Percentage yield =?
Percentage yield = Actual yield / Ideal yield × 100
Percentage yield = 3.95 / 5.24 × 100
Percentage yield = 395 / 5.24
Percentage yield of MgSO₄ = 75.4%
Which scenario best describes a relationship of parasitsm
can u pls help me with this question
Answer:
B
Explanation:
Which interactions and processes contribute to the dissolution of ionic compounds in water?
A student is trying to determine the rate law of a chemical reaction. When the initial concentration is varied, the initial reaction rate is always the same. The student concludes that something must be wrong with the chemicals or reaction and decides to increase the temperature. What can you say about this conclusion
Answer:
His conclusion is wrong
Explanation:
Now we must know that there are various rate laws.
In a zero order rate law, the rate of reaction is independent of the initial concentration of reactants. Hence varying the initial concentration of the reactants results in no change of the rate of reaction.
In first and second order rate laws, the rate of reaction varies with the concentration of one or two reactants in either case respectively.
Having said these, the student does not need to change the temperature but rather designate the reaction as zero order. The rate of reaction is independent of the initial concentration of reactants.
Write a balanced equation for the complete oxidation reaction that occurs when glucose (C6H12O6) reacts with oxygen. Use the smallest possible integer coefficients.
Answer:
C₆H₁₂O₆ + 6O₂ —> 6CO₂ + 6H₂O
Explanation:
Glucose (C₆H₁₂O₆) react with oxygen (O₂) to produce carbon dioxide (CO₂) and water (H₂O).
The equation can be written as follow:
C₆H₁₂O₆ + O₂ —> CO₂ + H₂O
The above equation can be balance as illustrated below:
C₆H₁₂O₆ + O₂ —> CO₂ + H₂O
There are 6 atoms of C on the left side and 1 atom on the right side. It can be balance by putting 6 in front of CO₂ as shown below:
C₆H₁₂O₆ + O₂ —> 6CO₂ + H₂O
There are 12 atoms of H on the left side and 2 atoms on the right side. It can be balance by putting 6 in front of H₂O as shown below:
C₆H₁₂O₆ + O₂ —> 6CO₂ + 6H₂O
There are a total of 8 atoms of O on the left side and a total of 18 atoms on the right side. It can be balance by 6 in front of O₂ as shown below:
C₆H₁₂O₆ + 6O₂ —> 6CO₂ + 6H₂O
Now, the equation is balanced.
solution. Identify the concentration of the nye
10. Determine the volume/volume percent solution made by combining 25 ml of ethanol with enough water to
produce 200 mL of the solution.
Answer:
12.5%
Explanation:
Given data:
Volume/Volume % = ?
Volume of solute = 25 mL
Volume of solution = 200 mL
Solution:
Formula:
v/v% = ( volume of solute / volume of solution ) × 100
by putting values,
v/v% = ( 25 mL / 200 mL) × 100
v/v% = 0.125 × 100
v/v% = 12.5%
Vernon is using the diagram shown below to develop a model of photosynthesis. The letters A, B, and C each represent a reactant or product of the process.
In the light-dependent reactions, light strikes the oval thylakoids. Compound A enters the thylakoid, and compound B leaves it. In the light-independent reactions, compound C enters a cycle in the stroma, and sugars leave the cycle. ATP and NADPH cycle between the two sets of reactions.
Vernon wonders whether NADPH and ATP should be classified as reactants or as products of photosynthesis. How should these compounds be classified?
A. as reactants, because they are used up by photosynthesis
B. as products, because they are generated by photosynthesis
C. as either reactants or products, depending on the rate that photosynthesis occurs
D. as neither reactant nor product, because they are recycled instead of made or used up
Answer:
The anwser to this problem is C :)
Explanation:
The compounds can be classified as C. as either reactants or products, depending on the rate that photosynthesis occurs.
Based on the information given, in the light-dependent reactions, light strikes the oval thylakoids. Also, as compound A enters the thylakoid, compound B leaves it, and compound C enters a cycle in the stroma, and sugars leave the cycle.
It can be deduced that the compounds can be classified as either reactants or products, depending on the rate at which photosynthesis occurs.
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answer the following
Which group of elements is considered the most reactive non-metals?
A. Alkalis
B. Alkaline Earth
C. Halogens
D. Noble Gases
Please I need help
Thank you so much if you can help me
Which group of elements is considered the most reactive non-metals?
Answer:D. Noble Gases
The noble gasses are a special group because of their lack of reactivity, the element fluorine is the most reactive nonmetal. It is not found in nature as a free element.#CARRYONLEARNING #STUDYWELLThe halogens will be considered the most reactive non-metals.
What is halogens?The halogens are just a group of 4 - 6 individual elements in a particular periodic table.
What is non-metals?A nonmetal is just a chemical element which lacks the majority of properties associated, ranging from colorless gases to gleaming, high-melting-temperature of the solids.
Each outer shell includes seven electrons, hence group 7 metals would have to gain 1 extra electron to achieve a full outer shell of electrons. When we proceed up the group, this allows us to draw one electron, making it much more reactive.
To know more halogens and non-metals.
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How many moles of CO are present in 35.88 L of the gas?
Answer:
1.602 moles CO
Explanation:
To convert from liters to moles, divide by 22.4:
35.88 L / 22.4 = 1.602 moles CO
How much work is done when Bob uses 75 newtons of force to move a block 8 meters?
Answer:
600 JExplanation:
The work done by an object can be found by using the formula
workdone = force × distance
From the question we have
workdone = 75 × 8
We have the final answer as
600 JHope this helps you
What are advantages of specialization
Answer:
ACE
Explanation:
Defined skill set: When we say advantages it is seen that it can be visualized during the early stages of one’s career.
Upward growth: Having a specific skill or being specialized in that work would also bring growth in that division. ...
Good package: A job specialization means a person is knowing how to do that work and complete it.
Can someone plz help me it’s due tomorrow!!!!!!!
Answer:
1.A lantern has a candle or fuel cell which heats the air and this hot air fills the sky lantern. The consequence of this is that the lantern rises in the air. This happens because the hot air inside the lantern is lighter than the cool air surrounding it. ... This fuel cell is lit before the lantern is launche
2.Whenever something becomes warmer, the kinetic energy of its atoms or molecules has increased. When matter gets warmer, the atoms or molecules in the matter move faster. It's easy to increase the kinetic energy in matter.
A scientist observes rock masses that have moved past each other in opposite horizontal directions. Which feature does the scientist observe?
plateau
syncline
strike-slip fault
fault-block mountain
Answer:
Strike-Slip Fault
Explanation:
The scientist observes strike slip fault feature when rock masses that have moved past each other in opposite horizontal directions.
The feature that the scientist observes when rock masses move past each other in opposite horizontal directions is a strike-slip fault.
What is a A strike-slip fault?A strike-slip fault is a type of fault in which two rock masses slide past each other horizontally in opposite directions. This type of fault is caused by shearing forces, which cause the rock masses to move sideways against each other.
As a result, the rocks on either side of the fault can move in different directions, creating an offset in the landscape. Strike-slip faults can occur in various settings, including transform plate boundaries, where two tectonic plates slide past each other, and in areas of high seismic activity, where the Earth's crust is under a lot of stress.
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In which part of the cell is the majority of the energy released from the breakdown of glucose?
nucleus
mitochondrion
cytoplasm
plasma membrane
Answer:
Mitochondrion
Explanation:
took the quiz
Which example is an endothermic process
Answer:
Endothermic reactions is the result of heat being absorbed.
Explanation:
Melting ice cubes. Melting solid salts. Evaporating liquid water. Converting frost to water vapor (melting, boiling, and evaporation, in general, are endothermic processes.
(These are all examples of endothermic reactions.)
Which of the following can be used to indicate which direction heat transfer will flow between two
objects?
A. Cold
B. Heat
C. Temperature
D. Potential energy
Answer:
the answer is potential energy
Explanation:
Answer: potential energy
Explanation:
adding heat and increasing concentration are meant to cause an increase in....?
Answer:
Adding heat and increasing concentration are meant to cause an increase in the rate of a reaction
Explanation:
The rate of a chemical reaction is defined as the number of moles of reactants converted or products formed pee unit time. It is a measure of how quickly the reactants in a given reaction are used up to form products or how quickly products are formed from reactants.
Factors that affect the rate of a chemical reaction include:
1. Nature of reactants
2. Concentration/pressure (for gases) of reactants
3. Temperature of reaction mixture
4. Presence of light
5. Presence of a catalyst
The effect of increasing the concentration of reactants for a given chemical reaction is that the reaction rate will increase. This is so because, according to the collision theory of chemical reactions, the frequency of collision between reactant particles which results in a chemical reaction (effective collisions) will increase when the reactant particles are crowded together in a small space due to an increase in their concentration.
The effect of increasing temperature or adding heat to a reaction is that the reaction rate increases. When the heat is added to a reactant particles, the number of particles with energies greater than or equal to the activation energy (the minimum amount of energy that reactant particles must possess for effective collisions) increases. Also, the average speed of the reactant particles increases resulting in a greater frequency of collision. Hence, the rate of the chemical reaction increases.
HURRY PLEASE!!!!!!!!!!!!
Answer:
Green.
Explanation:
Only the particles that hit the nucleus of the atom bounced off.
in sience is copper a element or not a element
Answer:
a element
Explanation:
In science copper is a element. It is one of the transition metals found on the periodic table of elements.
Elements are distinct substances that cannot be split-up into simpler substances. Such substances consist of one kind of atom.
There are over a hundred elements that are known till date.
Each elements combines to form a compound
Answer:its an element
Explanation:
a helium balloon at 28 C has a volume of 1.8 L and a pressure of 102 kPa. what is the volume of the balloon when is rises into the atmosphere where the pressure is 85 kPa and the temperature is 4 C?
Answer:
V₂ =1.99 L
Explanation:
Given data:
Initial volume = 1.8 L
Initial temperature = 28°C (28+273.15 K= 301.15 k)
Initial pressure = 102 KPa
Final volume = ?
Final pressure = 85 KPa
Final temperature = 4°C (4+ 273.15 K = 277.15 K)
Solution:
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
V₂ = 102 KPa × 1.8 L × 277.15 K / 301.15 K × 85 KPa
V₂ = 50884.74 KPa .L. K / 25597.75 K.KPa
V₂ =1.99 L
The mass number of an atom
Answer:
the mass numder of atoms is called atomic mass
Calculate the number of moles of aluminum, sulfur, and oxygen atoms in 3.00 molesmoles of aluminum sulfate, Al2(SO4)3Al2(SO4)3. Express the number of moles of AlAl, SS, and OO atoms numerically, separated by commas.
Answer:
[tex]n_{Al}=6.00molAl\\\\n_{S}=9.00molS\\\\n_{O}=36.0molO[/tex]
Explanation:
Hello!
In this case, when analyzing the moles of an element inside a compound, we need to keep in mind that a mole ratio should be set up; thus, for aluminum sulfate, we have the following ones:
[tex]\frac{2molAl}{1molAl_2(SO_4)_3} \\\\\frac{3molS}{1molAl_2(SO_4)_3} \\\\\frac{12molO}{1mol1molAl_2(SO_4)_3}[/tex]
Thus, starting by 3.00 moles of aluminum sulfate, the moles of each element turn out:
[tex]n_{Al}=3.00molAl_2(SO_4)_3*\frac{2molAl}{1molAl_2(SO_4)_3} =6.00molAl\\\\n_{S}=3.00molAl_2(SO_4)_3*\frac{3molS}{1molAl_2(SO_4)_3} =9.00molS\\\\n_{O}=3.00molAl_2(SO_4)_3*\frac{12molO}{1molAl_2(SO_4)_3}=36.0molO[/tex]
Best regards!
I think that rock from the mantle is added to the edges of both plates at
convergent plate boundaries.
divergent plate boundaries.
Answer:
The Earth’s lithosphere, which includes the crust and upper mantle, is made up of a series of pieces, or tectonic plates, that move slowly over time.
A divergent boundary occurs when two tectonic plates move away from each other. Along these boundaries, earthquakes are common and magma (molten rock) rises from the Earth’s mantle to the surface, solidifying to create new oceanic crust. The Mid-Atlantic Ridge and Pacific Ring of Fire are two examples of divergent plate boundaries.
Answer: Divergent
Explanation: im pretty sure its a multiple choice question
Question 3 of 10
Often, personal data are transmitted using digital signals. What might go
wrong with these transmissions?
A. The signal might become too weak to detect because it slows
down
B. The data might be altered, or changed, during the transmission
C. The data might be misinterpreted because of noise,
D. The data might be stolen or accessed by hackers.
Answer: D
Explanation:
The personal data are transmitted using digital signals. The data might be stolen or accessed by hackers to go wrong with these transmissions. Therefore, option D is correct.
What is digital signal ?A digital signal is one that can only ever take on one of a few discrete values at any given time. It represents data as a sequence of discrete values.
A continuous signal that represents physical measurements is an analog signal. Digital modulation is used to create time-separated signals known as digital signals. Sine waves serve as its signal. The square waves serve as a marker.
It makes use of a continuous range of values to aid in the representation of data. Digital technologies are any techniques, systems, equipment, or resources that produce, store, or process data electronically.
Thus, option D is correct.
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Please help me thanks so much?!?!
Answer:
D.
Explanation:
I did this question in school and got it right.
Answer:
The answer to your question is when the size, shape, or state of matter changes.
Explanation:
Change that does not undergo in the chemical composition.
