Answer:
C).Iron
Explanation:
Iron has a binding energy of 8.8MeV
Silver has two naturally isotopes and has an atomic mass of 107.868 amu. One isotope is Ag-109 isotope (108.905 amu) and has a natural abundance of 48.16%. What is the mass in amu of the other isotope
Answer: 106.905
Explanation: If there are only 2 isotopes, and 1 of them is 48.16%, the second must, by default, be (100 - 48.16%) = 51.84% The final, averaged, atomic mass is 107.868. This is made up of each isotope's atomic mass times the percentage of that isotope in the total sample. The weighted value of the known isotope (109) plus that of the unknown must come to the observed value of 107.868 amu. (107.868 - 52.45 = 55.42). Divide that by the % for that isotope (55.42/0.5184) = 106.90 amu for the second isotope.
Atomic Mass % of Sample Weighted Value
108.905 48.16% 52.45
X 51.84% 55.42
107.87
X = (55.42/0.5184) = 106.90 amu
The pungency of chillies is due to ____________.
Answer:
The hotness or pungency of chilli is due to presence of a group of compounds called capsaicinoids. Among capsaicinoids, capsaicin and dihydrocapsaicin are present in major quantities, while homocapsaicin, nordihydrocapsaicin and homo-dihydrocapsaicin are present in very small quantities.
The pungency of chillies is due to the presence of certain compounds called capsaicinoids.
What is the vapor pressure of a solution of sucrose (C12H22011) prepared by
dissolving 40.0 g of sucrose in 400.0 g of water at 100°C? The vapor pressure of
pure water at 100°C is 760 Torr. Assume 3 sf.
a) 760 Torr
b) 10.00 Torr
c) 756 Torr
d) 2.00 Torr
The vapour pressure of the solution is 752 Torr from Raoult's law .
Mass of solute (m1) = 40.0 g
Mass of solvent(m2) = 400.0 g
Vapor pressure of solution (p) = ?
vapor pressure of pure water (p°) = 760 Torr
From Raoult's law
p = X p⁰
X = number of moles of solvent / number of moles of solution
number of moles of solvent, n₁ = mass in grams / molar mass = 400.0 g /18g/mol = 22.22 moles
number of moles of solute, n₂ = mass in grams / molar mass = 40.0 g/ 342.3 g/mol = 0.12 moles
total number of moles, n₁ + n₂ = 22.22 moles + 0.12 moles = 22.34 moles
moles fraction of water, X = 22.22 moles/22.34 moles = 0.99 moles
From Raoult's law;
p = p⁰ X
p = 760 Torr * 0.99 moles
p = 752 Torr
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what's the agriculture
Answer:
the science or practice of farming, including cultivation of the soil for the growing of crops and the rearing of animals to provide food, wool, and other products.
Explanation:
Mark me as brainiliest
Answer:
Agriculture is a practice of farming, including cultivation of the soil for growing crops and the rearing of animals to provide food,wool and others.
Hope it helps !Describe what must be happening to the particles above as the change is happening
Answer:
d
Explanation:
solids the modicual are tightly packed
liquid, more room to move around aka not so tightly packed
gas, can move where ever it wants aka not paked at all
What subatomic particles determine the mass number?
Explanation:
the protons and neutrons contribute to the mass of an element . This is because they are both found in the nucleus where the mass is mostly concentrated is
what is stem distillation?how is it done?
Answer:
Steam distillation is a separation technique that harnesses the low boiling point property of immiscible mixtures.
Steam distillation is a separation technique that harnesses the low boiling point property of immiscible mixtures.it is done by passing dry steam through the plant material whereby the steam volatile compounds are volatilized, condensed and collected in receivers.
Which of the following
figures has all sides
equal? A. Square, B. Rectangle
c.Circle, b. cube
Answer:
the answer should be square, because by it's area formula (l²)we can tell that all it's sides are equal.but for a circle it just has a circumference and not sides.a rectangle on the other hand has only two sides equal.
but I also think the answer could be cube because all it's faces are equal.
I hope this helps
why would methane attain a tetrahedral structure?
Use what you know about valence electrons and the octet rule to explain why alkali
metals are more likely to lose electrons than gain them.
please help me create an hypothesis in the, if/then format for the question Does different types of vinegar, change the time it takes for the baking soda to die down.
ILL MAKE YOU BRAINIEST!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
ask your mom or dad to help you
2. State a common metric unit and symbol obtained from each of the following instruments.
(a) metric ruler
(b) balance
(c) graduated cylinder
(d) thermometer
Answer:
cm
Explanation:
for short measurements
Which of the following is not a subatomic particle?
a. proton
b. electron
c. isotope
d. neutron
Answer: D
Explanation:
it's easy
Each roman numeral represents a sample of a substance. Each circle represents an atom. Considering what qualifies as a pure substance, which image(s) would be considered pure substances?
III and V
V
II and IV
I and III
Answer:
III and V
Explanation:
Both of them are evenly spread homogenous mixtures.
The images that would be considered pure substances are III and V. Thus, the correct option for this question is A.
What is a Pure substance?A pure substance may be defined as a type of substance or matter that has a constant composition and properties that are constant throughout the sample.
It is scientifically found that a pure substance is typically made up of only one kind of particle and has a fixed or constant structure. According to the given diagram, images III and V signify the even distribution of the same type of atoms of molecules within the substances.
Apart from physical properties, pure substances also shares identical chemical properties as well.
Therefore, the images that would be considered pure substances are III and V. Thus, the correct option for this question is A.
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Katie's teacher has asked her to identify an unknown
substance. She thinks about the properties of matter that will
help her identify the substance. She knows it is a colorless
liquid. She thinks it may be water but knows there are many
colorless liquids that are not water.
Which of the following statements would inform Katie that the
liquid is NOT water?
a The liquid freezes at 32°C.
b The liquid is clear.
C The liquid boils at 100°C.
d The volume of the sample is 100 ml.
This exercise will lead you to verify that the average atomic mass of magnesium is 24.31 amu, based on the following information:
isotope mass (amu) percent abundance
24Mg 23.985042 78.99%
25Mg 24.985837 10.00%
26Mg 25.982593 11.01%
The average atomic mass is the weighted average of the atomic masses of all isotopes.
What is the fractional abundance of 24Mg?
Answer: 24.305052 (8 sig figs) [Mg]
Explanation: The AMU of each isotope is multiplied by it's percent abundance to yield a weighted average for each isotope. The sum of these weighted averages will be the wighted average of the element's isotopes:
Isotope Mass (AMU) % Weighted AMU
24Mg 23.985042 78.99% 18.94578468
25Mg 24.985837 10.00% 2.4985837
26Mg 25.982593 11.01% 2.860683489
24.305052 (8 sig figs)
Question # 10
Multiple Choice
Why is it impossible for muscle cells to reproduce nerve cells?
It is impossible because muscle cells are larger than nerve cells.
Muscle cells go through the process of mitosis and nerve cells do not.
Not all organisms contain the same muscle and nerve cells.
Cells can only create an identical copy of the original cell.
I sorta forgot the answer someone help
Answer:
The energy stored within things :)
Convert 34.0 mm to inches
Answer:
34 millimeters = 1.339 inches
Hope this helps!!
The measurement of 34 mm is equivalent to 1.326 inches.
What is the importance of Unit conversion?The unit conversion is given as the conversion of values in one unit to the equivalent value in another unit. It is used to ease the calculations, and perform operations.
The conversion of 34 mm to inch is given as:
1 mm = 0.039 inches
34 mm = 34 * 0.039 inches
34 mm = 1.326 inches
The measurement of 34 mm is equivalent to 1.326 inches.
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topic: Nomenclature and Formula Writing.
reward: up to 200 POINTS!
how?
...
Answer: Writing Formulas for Ionic Compounds Using Nomenclature Another important concept to master is the ability to write a chemical formula using the compound's systematic name.
Explanation:
If a recycling center collects 3245 aluminum cans and there are 22 aluminum cans in 1 lb what volume in liters
The volume in liters of 3245 aluminum cans is 24.8 L.
A recycling center collects 3245 aluminum cans and there are 22 aluminum cans in 1 lb. The mass of 3245 aluminum cans is:
[tex]3245 cans \times \frac{1lb}{22cans} = 147.5 lb[/tex]
To convert mass to volume, we need the density of aluminum (5.95 lb/L). The volume corresponding to 147.5 lb of aluminum is:
[tex]147.5 lb \times \frac{1L}{5.95 lb} = 24.8 L[/tex]
The volume in liters of 3245 aluminum cans is 24.8 L.
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Determine the number of protons, neutrons, and electrons in the following isotopes
that are used in medical diagnoses:
a. atomic number 9, mass number 18, charge of 1-
b. atomic number 43, mass number 99, charge of 7+
C. atomic number 53, atomic mass number 131, charge of 1-
d. atomic number 81, atomic mass number 201, charge of 1+
e. Name the elements in parts (a), (b), (c), and (d).
Answer: In table below.
Explanation:
A.N. (atomic number) = protons
Mass (Total AMU)
Charge
P= Protons, same as atomic number
N = Neutrons, Atomic Mass Number - Protons
E = Electrons. (Atomic Number - Charge)
Element = Defined by atomic number
a) Atomic number=9 Protons = 9, neutrons = 9, electrons = 10
b) Atomic number=43, Protons = 43, neutrons = 56, electrons = 36
c) Atomic number=53, Protons = 53, neutrons = 78, electrons = 52
d) Atomic number=81, Protons = 81, neutrons = 120, electrons = 80
e) Name the elements in parts (a), (b), (c), and (d) are F, Tc, I and Tl.
What is the atomic number?Atomic Number (Z)= number of protons = number of electrons
Mass number (A) = number of protons + number of neutrons.
For ions with a positive net charge:
Number of electrons = Z - net charge
For ions with negative net charge:
Number of electrons = Z + net charge
a) Atomic number=9 Protons = 9, neutrons = 9, electrons = 10
b) Atomic number=43, Protons = 43, neutrons = 56, electrons = 36
c) Atomic number=53, Protons = 53, neutrons = 78, electrons = 52
d) Atomic number=81, Protons = 81, neutrons = 120, electrons = 80
e) Name the elements in parts (a), (b), (c), and (d) are F, Tc, I and Tl.
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Give two chemical properties of metals and one
equation each to
represent them
Answer:
Chemical Properties of Metals:
The density of metals is usually high.
The density of metals is usually high.Metals are malleable and ductile.
Please help ASAP!!!!!!!!
Answer:
Explanation:
I believe the answer to the blank would be pesticides
Certain pesticides contain specific chemicals that are able to attack the targeted pest. An example of this would be ant killer. Broad spectrum pesticides cause more collateral damage because they basically kill everything, including beneficial insects like bees.
Hope this helps! Best of luck <3
What does the -40, -42, -43, -44, -46,-48 mean for each isotope of Calcium?
Why are intensive properties useful for identifying a substance?
A.They do not depend on the amount of substance you have.
B.They are chemical properties.
C.They are physical properties.
D.They describe the amount of substance you have.
The intensive properties are useful for identifying a substance because it does not depend upon the amount of substance present in the sample.
The points regarding properties are the following:
The intensive properties are defined as the properties which do not depend on the amount of the substance present in the matter but depend only on the type of the matter.The colour, solubility, texture, etc. are the intensive properties. •The properties which depend upon the amount of the substance present in the sample is called the extensive properties.The mass, density etc. are the extensive properties.Therefore, the correct answer is the A. They do not depend on the amount of substance you have.
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what is an example of density? pls helppp
Answer:
sruff that has to do wuth vikun=
Explanation:
good job
2. One of the following is not a property of a mixture
a. always has the same composition
b. is a physical blend of two or more substances
c. each component retains its own identity
d. can be separated into components
Answer:
d. can be separated into components
it's the answer and i hope it helps you
Describe an example that could be an observational study
9.Out of the following which is a poly atomic molecule. (H2, CI 2.03.)
Please Please help
Answer:
H2 is poly atomic molecule
