Half-life is the length of time it takes for half of the radioactive atoms of a specific radionuclide to decay. A good rule of thumb is that, after seven half-lives, you will have less than one percent of the original amount of radiation.
What do you mean by half-life?half-life, in radioactivity, the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay (change spontaneously into other nuclear species by emitting particles and energy), or, equivalently, the time interval required for the number of disintegrations per second of a radioactive.
What affects the half-life of an isotope?Since the chemical bonding between atoms involves the deformation of atomic electron wavefunctions, the radioactive half-life of an atom can depend on how it is bonded to other atoms. Simply by changing the neighboring atoms that are bonded to a radioactive isotope, we can change its half-life.
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Two amino acids combine to form a dipeptide when the amino group of one reacts with the acid group of the other. Which structure is correct
The correct structure that shows two amino acids combine to form a dipeptide when the amino group of one reacts with the acid group of the other is structure A.
What happens in amino acids combination?When two amino acids combine to form a dipeptide, a peptide bond is formed between the amino group of one amino acid and the carboxyl group of the other amino acid. This forms a long chain of amino acids, which is the basis for proteins.
The resulting structure can be represented as:
H₂N-CHR-CO-NH-CHR-COOH
Where R represents the side chain of the amino acid.
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Complete question:
Two amino acids combine to form a dipeptide when the amino group of one reacts with the acid group of the other. Which structure is correct
Can somebody plz help answer all these true and false questions CORRECT!!
WILL MARK BRAINLIEST :D
Answer:
1-T
2-F
3-T
4-T
Explanation:
big brain
Danielle, a student in a science class, has been
asked to design an experiment to examine the
process of thermal equilibrium. She places two
objects that have the same mass but different
initial temperatures in contact with each other.
She records the final temperature in a table after
the heat has been transferred.
Mass Initial. Final
. Temp °C Temp °C
object A : 5g 55°C 40°C
Object B: 5g 25°C 40°C
What was Danielle's conclusion?
A. The two objects of varying temperatures have
thermal equilibrium and heat is maximum.
B. The two objects of varying temperatures have
thermal expansion and entropy is maximum.
C. The two objects of varying temperatures have
thermal expansion and heat is maximum.
D. The two objects of varying temperatures have
thermal equilibrium and entropy is maximum.
The two objects of varying temperatures have thermal equilibrium and entropy is maximum. Option D
What is thermal equilibrium?When we talk about the term thermal equilibrium, we are talking about the fact that the two objects would have the same temperature. The two objects that are under consideration are substances that have different temperatures but a point would come that the two objects would now be at the same temperature. This point that the two objects are now at the same temperature is called the point of the thermal equilibrium of the object.
Having said this, we have to look at the table where the initial and the final temperatures of the objects have been shown, we can see that the thermal equilibrium was actually achieved for the objects and this would lead to a maximum value of the entropy.
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please help with the question tagged below
Answer:
It can lose it's electrion
Explanation:
What is the % yield if 20 grams of hydrogen is reacted with 32 grams
of oxygen and produces 9 grams of water?
H2 + O2 -> H2O
Answer:
12.5%
Explanation:
32/16 = 2 moles of oxygen
2 x 18.01 x 2/1 = 72.04 g of H2O
9/72.04 x 100 = 12.5%
balanced equation: 2H2 + O2 → 2H2O
limiting reactant is oxygen
If 20 g of hydrogen is reacted with 32 g of oxygen to produce 9 g of water, the percentage yield is 5%.
What is Percent yield?
Percent yield is the ratio of the actual yield times the theoretical yield to 100. When the actual and theoretical yield are equal, the percentage yield is 100%. So if the actual yield is less than the theoretical yield then the percentage yield is less than 100%. This situation may arise due to the incompleteness of the reaction or the loss of the sample during the recovery process.
According to the stoichiometry of reaction of formation of water,
4 g hydrogen gives 36 g water, thus, 20 g hydrogen gives 20×36/4=180 g water which is theoretical yield.
So, the percent yield=observed yield/theoretical yield×100
percent yield=9/180×100=5%.
Thus, if 20 g of hydrogen is reacted with 32 g of oxygen to produce 9 g of water, the percentage yield is 5%.
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how many grams of hno3 are needed to make 1.5m solution of acid in enough water to make 0.152 of solution
To make a 1.5 M solution of HNO3 with a volume of 0.152 L, you would need approximately 27.36 grams of HNO3.
To determine the grams of HNO3 needed, we can use the equation:
Molarity (M) = moles of solute / volume of solution (L)
Given that the desired molarity is 1.5 M and the volume of the solution is 0.152 L, we can rearrange the equation to solve for moles of HNO3:
moles of HNO3 = Molarity (M) * volume of solution (L)
Substituting the given values, we have:
moles of HNO3 = 1.5 M * 0.152 L = 0.228 moles
Finally, we can calculate the grams of HNO3 using its molar mass (63.01 g/mol):
grams of HNO3 = moles of HNO3 * molar mass of HNO3
grams of HNO3 = 0.228 moles * 63.01 g/mol ≈ 27.36 grams
Therefore, approximately 27.36 grams of HNO3 are needed to make a 1.5 M solution with a volume of 0.152 L.
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PLZ HELP!!
Why do you think only one material is able to pass through the membrane? *think about what kind of materials can diffuse through the membrane*
Here is a picture that might help :)
How many molecules of sucrose are
in 205 g C12H22011?
(C12H22O11, 342.34 g/mol)
[?]
[? ]×10¹²] molecules C12H22O11
Coefficient (green) Exponent (yellow)
I
Enter
To begin with, sucrose is C12H22O11. Additionally, we must determine how many moles of sucrose there are in a pound of sucrose:
The moles of sucrose are 454g, 342.30g, mol1, and 1.33mol.
Is sucrose a good sugar to use?
Brief Summary According to a University of California, Davis study that was published in the Journal of Clinical Endocrinology and Metabolism, sucrose, the more "natural form of sugar," may be just as harmful to your health as HFCS.
Is sugar a healthy food?
Your body only receives sugar when you consume sucrose like soda or candy, and typically too much of it. The threat is present here. You run the risk of major health problems if you consume too much added sugar (fructose or sucrose) in your diet.
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Atomic Mass is the ___________ of the mass numbers of all the isotopes of an element.
Answer:
Number of proton + No of electron
Explanation:
Mark me brainlist
Answer:
No of neutron + no of protons
Explanation:
Since atomic mass is the sum total of the neutron and mass number then we can say that, neutron number plus proton number is the mass number of all isotopes.
2 points
Stu Dent wants to create a salt water solution. He uses 0.614 moles of salt and 182 milliliters of water. What is the molarity of the solution?
Type your answer...
Answer: The molarity of solution is 3.37 M
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.
\(Molarity=\frac{n\times 1000}{V_s}\)
where,
n = moles of solute = 0.614
\(V_s\) = volume of solution in ml = 182 ml
Now put all the given values in the formula of molarity, we get
\(Molarity=\frac{0.614\times 1000}{182}=3.37M\)
Therefore, the molarity of solution is 3.37 M
Carbon cycle – What are the main reservoirs
of the carbon cycle? Where do the inorganic and organic carbon
cycles interact? What are the major differences and similarities
between the inorganic and organic carbon?
The main reservoirs of the carbon cycle are the atmosphere, oceans, land (including vegetation and soils), and fossil fuels. In these reservoirs, carbon exists in both inorganic and organic forms.
The inorganic carbon cycle involves the exchange of carbon dioxide (CO2) between the atmosphere and oceans through processes like photosynthesis and respiration.
Organic carbon, on the other hand, is found in living organisms, dead organic matter, and soil organic matter. It is cycled through processes such as decomposition and consumption by organisms. The interactions between the inorganic and organic carbon cycles occur primarily in the biosphere, where photosynthesis converts inorganic carbon into organic carbon compounds. While inorganic carbon is primarily in the form of CO2, organic carbon is present in complex organic molecules. Both forms of carbon play crucial roles in energy transfer, nutrient cycling, and climate regulation.
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Methane and water react to form hydrogen and carbon monoxide, like this: CH4(g)+H20(g) → 3 H,(g) + CO(g) The reaction is endothermic. Suppose a mixture of CH4, H20, H2 and CO has come to equilibrium in a closed reaction vessel. Predict what change, if any, the perturbations in the table below will cause in the composition of the mixture in the vessel. Also decide whether the equilibrium shifts to the right or left.
Answer is given in parts
Given equation: CH4(g)+H20(g) → 3 H2(g) + CO(g)
The given reaction is endothermic. It can be predicted that if there is an increase in temperature, the equilibrium will shift to the right as an endothermic reaction will favor the forward reaction to absorb more heat. If there is a decrease in temperature, the equilibrium will shift to the left.
Perturbations Effect on the composition of mixture Effect on the equilibrium
a. Removal of CH4 Decrease Decrease in CH4 will shift the equilibrium to the right.
b. Addition of CO Increase The addition of CO will shift the equilibrium to the left as the reaction will try to use up the excess CO.
c. Increase in Pressure No effect The increase in pressure will have no effect as the total number of moles of gases is the same on both sides of the equation.
d. Increase in temperature Increase Increase in temperature will shift the equilibrium to the right as it is an endothermic reaction and will favor the forward reaction to absorb more heat.
e. Addition of H2O No effect The addition of H2O will have no effect as there is already H2O present on the reactant side and the product side.
f. Removal of CO Decrease The removal of CO will shift the equilibrium to the right as the reaction will try to replace the lost CO.
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How many electrons are there?
Answer:
36
Explanation:
Se has a negative charge of -2
in order for that to be possible there has to be 2 more negative charges than positive chrages
in other words
34 protons 36 electrons
34+ 36-
briefly explain why the ratio of volume of gas produced to mass of reactants should remain constant.
The ratio of the volume of gas produced to the mass of reactants should remain constant because of the law of conservation of mass.
This law states that mass cannot be created or destroyed in a chemical reaction. Therefore, the mass of the reactants must equal the mass of the products. Since the volume of gas produced is directly related to the mass of the reactants, the ratio of volume to mass must remain constant in order to adhere to the law of conservation of mass.
In other words, if the mass of the reactants increases, the volume of gas produced must also increase in order to maintain the same ratio. Similarly, if the mass of the reactants decreases, the volume of gas produced must also decrease to maintain the constant ratio.
In summary, the ratio of volume of gas produced to mass of reactants should remain constant because it is a reflection of the law of conservation of mass, which states that mass cannot be created or destroyed in a chemical reaction.
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With the knowledge of basic ideas of nuclear power, how it works, affects our environment, should the us government provide more or less funding per year to this technology. Should they invest more in this technology? The same or less? Why?
Answer:
CLEAN ENERGY SOURCE
Nuclear is the largest source of clean power in the United States. It generates nearly 800 billion kilowatt hours of electricity each year and produces more than half of the nation’s emissions-free electricity. This avoids more than 470 million metric tons of carbon each year, equivalent to removing 100 million cars off the road.
CREATES JOBS
The nuclear industry supports nearly half a million jobs in the United States and contributes an estimated $60 billion annually to the U.S. gross domestic product. U.S. nuclear plants can employ up to 700 workers with salaries that are 30% higher than the local average. They also contribute billions of dollars annually to local economies through federal and state tax revenues.
SUPPORTS NATIONAL SECURITY
A strong civilian nuclear sector is essential to U.S. national security and energy diplomacy. The United States must maintain its global leadership in this arena to influence the peaceful use of nuclear technologies. The U.S. government works with countries in this capacity to build relationships and develop new opportunities for the nation’s nuclear technologies.
Explanation:
For many purposes we can treat propane C3H8 as an ideal gas at temperatures above its boiling point of −42.°C Suppose the temperature of a sample of propane gas is raised from -28.0°C to 9.0°C, and at the same time the pressure is increased by 5.0%
The percent change in volume is 21 %.
given that :
temperature , T1 = 273 -28 = 245 K
temperature , T2 = 273 + 9 = 282 K
pressure P1 = P
pressure P2 = P - O.O5 P = 0.95 P
Volume V1 = V
volume V2 = ?
using ideal gas equation , we get :
P1 V1 / T1 = P2 V2 / T2
V2 = (P1 V1 T2 ) / P2 T1
V2 = ( P × V × 282 ) / ( 0.95 P × 245 P )
V2 = 1.211 V
change in volume is given as = V2 - V1
= 1.211 V - V
= 0.211 V
Percent change in volume is = (0.21 V)) / V ) × 100 %
= 21 %
Thus, For many purposes we can treat propane C3H8 as an ideal gas at temperatures above its boiling point of −42.°C Suppose the temperature of a sample of propane gas is raised from -28.0°C to 9.0°C, and at the same time the pressure is increased by 5.0% . the percent change in volume in 21 %.
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i have an science question and i don’t know how to do it, Which math function can be used to find the time an object moved if you have the
speed?
speed = distance / time
v = d / t
If we simplify this and isolate t, then we get t = d / v
Students in a science class prepared flash cards so that they could quiz one another about the
arrangement of the periodic table. One of the flash cards contained information about two
elements, Element L and Element M.
Qualities:
-Atom of element M has two more balances electrons than element atoms of L
- atoms of element L are more reactive than atoms of element M
-both elements are metals
The students had to use the information on n the flash cards to determine possible positions of the two elements on a blank periodic table. Which periodic table has the elements placed in the locations that match the information on the flash cards?
Answer:
the periodic table is G.
The periodic table has the elements placed in the locations that match the information on the flash cards is F.
What is periodic table?The term "periodic table" refers to an arrangement of all known elements in order of increasing atomic number and recurrent chemical attributes. The periodic table is organized into 118 elements.
The term "periodic table" can also refer to a table that lists all known chemical elements in rows and columns.
In the F table, L is found in alkaline earth metals while M is found in transition metals. M has more valence electrons than L, while L is more reactive than M.
Thus, the periodic table has the elements placed in the locations that match the information on the flash cards is F.
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to which grop and period do the following elements belong carbon,neon,aluminium,potassium ,calcium,sulphur
Answer:
C:4A second period Ne:8A second period Al:3A third period K:1A fourth period Ca:2A fourth S:6A third period
Explanation:
There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Therefore, with the help of periodic table we can locate the element's position.
What is periodic table?Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.
Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet.
carbon belongs to period 2 and group 14
neon belongs to period 2 and group 18
aluminium belongs to period 3 and group 13
potassium belongs to period 4 and group 1
calcium belongs to period 4 and group 2
sulfur belongs to period 3 and group 16
Therefore, with the help of periodic table we can locate the element's position.
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please help me
16 1 point What is the decay rate of a sample of Oxygen-21 if the sample has 8.31x1017 atoms and a decay constant of 0.203/s? 4.09x1018Bq 1.69x10¹7Bq 0.203Bq 2.44x10-1⁹Bq Previous
decay rate of approximately 1.69x10^17 Bq (becquerels),
The decay rate of a radioactive sample is determined by the number of radioactive atoms present and the decay constant, which represents the probability of decay per unit of time.
To calculate the decay rate, we multiply the number of atoms in the sample by the decay constant. In this case, the sample has 8.31x10^17 atoms and a decay constant of 0.203/s. Multiplying these values gives a decay rate of approximately 1.69x10^17 Bq (becquerels), which represents the number of decays per second in the sample.
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What is the theoretical yield (mass of Al2O3 formed) for this reaction?
(answer is not 204)
Answer:
102 g Al₂O₃
Explanation:
The theoretical yield is the mass of product calculated via the molar masses and balanced chemical equation.
The limiting reagent is the reactant that is completely reacted before the other reactant(s) are used up. Since Al produces the smaller amount of product, it appears that Al is the limiting reactant. You can only make as much product as the limiting reactant allows. As such, the theoretical yield is 102 grams Al₂O₃.
What is the chemical formula for the molecule in Figure 8.8?
C3H7NO2
its an amino acid
its called
Alanine
Structure of : the carboxylic and amine groups are common to all amino acids. The central carbon atom is the Carbon atom
http://cmt.dur.ac.uk/sjc/thesis_prt/node8.html
https://www.chem.purdue.edu/jmol/molecules/alanin.html
Answer:
NH2C2H4COOH
Explanation:
for crude oil, if 150 pounds of co2 is released per million btus of energy, how much co2 is produced by each barrel of crude oil? (use information from the previous problem)
The amount of CO2 released by each barrel of crude oil is 150 pounds of CO2 per million BTUs multiplied by 5.8 million BTUs, which equals 870,000 pounds of CO2.
What is barrel?Barrels are cylindrical containers used for storing and transporting materials such as oil, wine, beer, and other liquids. Barrels are usually made of metal, usually steel, or wood, which is often used for storing alcohol. Barrels come in many different sizes and shapes, with the most common being the 55 gallon drum. Barrels have been used for centuries for storing and transporting goods, and are still used today in many industries. Barrels are often used in wineries and breweries to store and age wine and beer. Barrels are also used to transport oil and other hazardous materials, and even as a form of storage for food and other items.
A barrel of crude oil contains approximately 5.8 million BTUs of energy. Therefore, the amount of CO2 released by each barrel of crude oil is 150 pounds of CO2 per million BTUs multiplied by 5.8 million BTUs, which equals 870,000 pounds of CO2.
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Steel is an alloy that is used in making strong roofs because of its enhanced mechanical and chemical properties. Do you consider steel to be more or less malleable than the elements that make it? Explain your answer. Use in your answer the term lattice energy.
Answer:
Steel is less malleable.
Explanation:
Steel is less malleable than the elements that make it because of the presence of carbon in it. Steel is an alloy of iron and carbon which is harder than iron because of the presence of carbon. Iron in its pure form is softer that able the atoms slip over one another. If carbon is added, they stop the iron atoms from sliding apart so easily. This makes the metal stronger and harder.
You are compiling the temperature profile of a lake, which requires taking temperature readings at different depths. You collect the following data:
What depth range does the epilimnion occupy in this lake?
a. 0 to 3
b. 8 to 12
The depth range of the epilimnion in this lake is most likely a. 0 to 3 meters. Option A is correct.
To determine the depth range of the epilimnion, we need to identify the layer of the lake where the temperature change is most rapid, which indicates the transition between the warm surface layer and the colder deep layer.
Looking at the temperature readings, we can see that there is a significant temperature difference between the surface layer (0-3 meters) and the layer below (4-7 meters).
However, the temperature change between 4-7 meters and 8-12 meters is not as dramatic, indicating that the transition between the warm surface layer and the colder deep layer occurs somewhere between 3 and 8 meters.
Hence, A. 0 to 3 is the correct option.
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what mass of gold is produced when 21.1 a of current are passed through a gold solution for 37.0 min ? express your answer with the appropriate units.
The mass of gold that is produced when 21.1 a of current are passed through a gold solution for 37.0 min is 31.87 g
Using the formula
m = atomic mass × It /nF
Where m is the mass
n is the number of equivalents
F is the Faraday constant ( F = 96485 C)
I is the current
and t is the time
From the given information
I = 21.1 A
t = 37.0 min = 37.0 × 60
t = 2220 secs
For gold
Atomic mass = 196.97 g/mol
and n = 3
Putting these parameters into the formula, we get
m = 196.97 gmol⁻¹ × 21.1 A × 2220 sec / 3 × 96485
m= 9226468.74/ 289455
m= 31.87 g
Hence, the mass of gold that is produced is 31,87 g
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What is the mass number of an atom that contains 80 electrons, 80
protons, and 100 neutrons?
Answer:
180
Explanation:
proton = 80
electron = 80
neutron = 100
Note:- the atomic number of an element is the number of protons/electrons in the atomic shell
(protons = electrons)
Mass number = number of protons/electrons + number of neutrons
MN= NP+ NN
MN = 80 + 100
MN= 180
I HOPE THIS HELPS
Using your knowledge of the Brønsted-Lowry theory of acids and bases, write equations for the following acid-base reactions
a) HNO3 + OH-
b) CH3NH2 + H2O
c) OH- + HPO4-2
2) The compound NaOH is a base by the two of the theories we discussed in class. However, each of the ttwo theories describes what a base is in different terms. Use your knowledge of these ttwo theories to describe NaOH as an Arrhenius base, a Brønsted-Lowry base,
3) Write an equation for the reaction of potassium metal with hydrochloric acid.
4) Write the names for the following acids and bases:
a) KOH ____________________________________
b) H2¬Se ____________________________________
c) C2H3O2H ____________________________________
d) Fe(OH)2 ____________________________________
e) HCN ____________________________________
Using Bronsted - Lowry theory of acid and bases reaction :
a) HNO₃ + OH⁻ -----> NO₃ + H₂O
b) CH₃NH₂ + H₂O ------> CH₃NH₃⁺ + OH⁻
c) OH⁻ + HPO₄²⁻ ⇔ PO₄³⁻ + H₂O
2) NaOH is an Arrhenius base as it dissociates in water to give OH⁻ (hydroxide) and Na⁺ (sodium) ions.
NaOH is Bronsted Lowry base as it accepts H⁺ ion in the given reaction :
HCl + NaOH ---> H₂O + NaCl
3) potassium metal with hydrochloric acid:
2K + 2HCl ----> 2KCl + H₂
4)
a) KOH = potassium hydroxide is strong base
b) H₂Se = hydrogen selenide is acid
c) C₂H₃O₂H = acetic acid
d) Fe(OH)₂ = iron(II)hydroxide is base
e) HCN = hydrogen cyanide is weak base.
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What is the mass number of an isotope that has two neutrons
Answer:
mass number = 3
Explanation:
Hydrogen is the only chemical species that has an isotope with 2 neutrons. Since all hydrogen atoms only have 1 proton, the mass number of hydrogen isotope with 2 nuetrons would be 3. The mass number is equal to number of protons + neutrons (+ electrons but they have virtually no mass so they can be excluded).