The Diagram Shows The Box For An Element In The Periodic Table What Is The Atomic Mass Of The Element Shown?
A. 32.1
B. 48.1
C. 38
D. 16
Answer:
b
Explanation:
How many standard amino acids are there in the human body?
What is the least number of peptides in a polypeptide?
Answer:
-Theres 20 amino acids in the human body
-The least number of amino acids in a polypeptide are 10
Explanation:
How many Cl atoms are present in 307.62 grams of ccl4?
Answer: atomic mass of cl = 35.5 amu.
molar mass of ccl4 = (12) +4 (35.5)
= 12 + 142
= 154 amu.
mass of ccl4 = 385 g
no. of moles present = 385 / 154 = 2.5 mole
so, 2.5 mole of ccl4 is present in 385 grams .
Explanation:
In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together.
Using the chemical formula of the compound and the periodic table of elements, we can add up the atomic weights and calculate molecular weight of the substance.
If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100.
The atomic weights used on this site come from NIST, the National Institute of Standards and Technology. We use the most common isotopes. This is how to calculate molar mass (average molecular weight), which is based on isotropically weighted averages. This is not the same as molecular mass, which is the mass of a single molecule of well-defined isotopes. For bulk stoichiometric calculations, we are usually determining molar mass, which may also be called standard atomic weight or average atomic mass.
A common request on this site is to convert grams to moles. To complete this calculation, you have to know what substance you are trying to convert. The reason is that the molar mass of the substance affects the conversion. This site explains how to find molar mass.
Formula weights are especially useful in determining the relative weights of reagents and products in a chemical reaction. These relative weights computed from the chemical equation are sometimes called equation weights.
Finding molar mass starts with units of grams per mole (g/mol). When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. The formula weight is simply the weight in atomic mass
How many days are in an Earth year?
12. When filling a set of orbitals of equal energy which of the following is true?
Missing options
a. There are no sets of orbitals of equal energy
b. Two electrons will occupy the same orbital rather than separate orbitals
c. Two electrons will occupy different orbitals and have opposing spins.
d. Two electrons will occupy different orbitals and have like spins
Answer:
d. Two electrons will occupy different orbitals and have like spins
Explanation:
When the orbitals are degenerate ( equal energy) pairing does not start until each orbital in a particular subshell gets one electron each. After that pairing start. This is the basis of Hund's rule of maximum multiplicity.
When the electrons have occupied different orbitals in the same subshell their spin remains same, because opposite spin electrons exist in the same orbitals. and this pattern continues in the second, so the electron in the second orbital will resemble to that of the first orbital electron
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Answer:
c
Explanation:
because it is c ok ????????????
What attracts the electrons from the atom on the left?
The neutrons from the atom on the left
The electrons from the atom on the right
The protons from the atom on the right
The neutrons from the atom on the right
According to the placement of elements in the periodic table and the atomic structure, protons from atom on right will attract electrons from atom on left.
What is periodic table?Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.
It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.
Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.
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Why do you have to have set amounts of compounds
Answer:
compounds, on the other hands can have their bonds broken with practical amounts of energy, such as the heat from a fire. Matter can be broken down into two.
What is the proper way of collection, preservation and transition of hair?
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The table below compares wildlife supported by two plants growing around a lakeside ecosystem in South Florida.
Plant Species and Wildlife Data
Plant Species Wildlife Supported
Sawgrass Alligators, Snails
Melaleuca None
After a 25-year period, 95% of the ecosystem was covered by melaleuca. What would be the likely impact of this on the wildlife population?
Decreases, as shelter is a limiting factor
Increases, as shelter is a limiting factor
Decreases, as water is a limiting factor
Increases, as water is a limiting factor
Answer:
decreases
Explanation: decreases,as shelter is a limiting factor becasue the trees for example were there home now it is covered in melaleuca
hope this helps
Answer:
a should be the correct answer
Explanation:
there will not be many shelters that suit some animals needs
How many molecules are in 200g of water?
Answer: 6.6855 × 1024 Molecules.
Explanation:
Kevin was carrying out the following steps as part of an experiment.
What was the topic of this experiment?
A. The water cycle
B. The circulation of global winds
C. The formation of ocean currents
D. The formation of a hurricane over water
Answer: Its (c)
Explanation: Hope this helps!!
What is the ability to do work defined as?
OA. pressure
OB. energy
Ос.
force
OD
temperature
R
Answer:
It would be B
Explanation:
Describe how you could use the scientific method to develop the best time schedule for the nights your volleyball team has games.
Answer: In theory, the scientific method can be used to answer virtually any question imaginable. The scientific method is a consistent approach to acquiring knowledge that begins with a question and then uses a combination of research, testing and analysis to arrive at the answer to the question.
The object in this photo belongs to which major part of the Earth system?
O A. Hydrosphere
O B. Biosphere
O C. Atmosphere
O D. Geosphere
Answer:
B
Explanation:
Answer: B the biosphere it is a animal and a living thing
Explanation:
Which combination will produce a precipitate?
A) Naf (aq) and HCl (aq)
B) KOH (aq) and Mg(NO3)2 (aq)
C) NaOH (aq) and HCI (aq)
D) NaC2H302 (aq) and HCl (aq)
E) AgNO3(aq) and Ca(C2H302)2 (aq)
Answer: B
Explanation:
All acetates are soluble...
All halides are soluble EXCEPT for those of
A
g
X
,
H
g
2
X
2
,
and
,
P
b
X
2
...
All salts of the alkali metals are soluble....
All hydroxides are INSOLUBLE except for those of the alkali metals...
For
option c
we are likely to observe a fine precipitate
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Answer:
C
Explanation:
In an atom, electrons:
A. Are located in the nucleus
B. Sitting still on the edge of an energy level
C. Moving around the outside of the nucleus
D. Paired with a neutron
Answer:
C
Explanation:
Answer: c
Explanation:
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As the ice melts into liquid water, what happens to the kinetic energy of the particles in the sample?
Answer:
Increases
Explanation:
As ice melts into liquid water, the kinetic energy of the particles increases.
This is because to melt ices, heat energy is supplied.
The sum total of all the average speed of the particles in a substance is the heat energy. Heat is a form of kinetic energy. As more heat is added, the particles moves rapidly and the kinetic energy increase. What is the Kc and Kp of
P4(s)+6Cl2(g) = 4PCla-
Answer:
dfbdbdfbfd
Explanation:
regergfdbffg
Did the transformed plant grow into a healthy mature plant?
If not, you may have chosen a bad callus. (Click Back to try a different callus.)
Answer:
yeh if we transfer to a suitable place and transferm by not harming it then it will be a healthy mature plant . We should just replace it in right time,place and weather .
True or false: if you decrease the force on an object, its acceleration increases.
Answer:
I believe the answer is false. Acceleration increases when force is increased.
Explanation:
Select the correct electron configuration for Cu (Z = 29) Answer a. [Ar]4s13d10 b. [Ar]4s24p63d3 c. [Ar]4s23d0 d. [Ar]4s24d9 e. [Ar]5s24d9
Answer:
a. [Ar]4s13d10.
Explanation:
Hello!
In this case, since the electron configuration allows us to arrange the electrons moving around the atom of an element and equal the atomic number, we can write the electron configuration of copper as shown below:
[tex]Cu^{29}=1s^2,2s^2,2p^6,3s^2,3p^6,4s^2,3d^9[/tex]
However, in terms of the argon's electron configuration, which is:
[tex]Ar^{18}=1s^2,2s^2,2p^6,3s^2,3p^6[/tex]
We infer that the electron configuration of copper in terms of that of argon's is:
[tex]Cu^{29}=[Ar]4s^2,3d^9[/tex]
Therefore, the answer is a. [Ar]4s13d10 because the 4s² can be written as 4s¹ and therefore the 3d⁹ is changed to 3d¹⁰.
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The single most effective agent of chemical weathering at Earth's surface is _________
Answer:
Water.
Explanation:
Water is the most important agent of chemical weathering. Two other important agents of chemical weathering are carbon dioxide and oxygen.
Calculate the concentration of the resulting sodium oxalate solution if 0.1005 g of Na2C2O4 was used.
Answer:
0.00500M of Na₂C₂O₄
Explanation:
When are dissolved in 150 mL of 1.0 M H2SO4.
We can solve this problem finding molarity of sodium oxalate: That is, moles of Na2C2O4 per liter of solution. Thus, we need to convert the 0.1005g to moles using molar mass of sodium oxalate (134g/mol) and dividing in the 0.150L of the solution:
0.1005g * (1mol / 134g) = 7.5x10⁻⁴ moles of Na₂C₂O₄
In 0.150L:
7.5x10⁻⁴ moles of Na₂C₂O₄ / 0.150L =
0.00500M of Na₂C₂O₄The concentration of the solution is 0.005 M.
From the information available in the question;
We know that;
Mass of Na2C2O4 = 0.1005 g
Volume of solution = 150 ml
To obtain the number of moles of Na2C2O4;
Number of moles = mass/molar mass
Molar mass of Na2C2O4 = 134 g/mol
Number of moles = 0.1005 g /134 g/mol = 0.00075 moles
Concentration = number of moles/volume
Volume of solution = 150ml or 0.15 L
Concentration = 0.00075 moles/0.15 L
= 0.005 M
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Missing parts
An acidic solution of sodium oxalate (Na2C2O4) was prepared by dissolving ~0.100 g of Na2C2O4 in 150 mL of 1.0 M H2SO4 in a 250 mL Erlenmeyer flask. Calculate the concentration of the resulting sodium oxalate solution if 0.1005 g of Na2C2O4 was used.
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Answer:
C.
Explanation:
The same amount of force reacts to you
How many moles of CO2 are present in 14.6 L of CO2 gas at STP
Answer:
0.65mole of CO₂
Explanation:
Given parameters:
Volume of CO₂ = 14.6L
Unknown:
Number of moles of CO₂ = ?
Solution:
To solve this problem, we must understand that a mole of a gas occupies a volume of 22.4L at STP;
1 mole of gas occupies 22.4L of volume at STP;
y mole of CO₂ will occupy 14.6L of volume at STP
22.4y = 14.6
y = [tex]\frac{14.6}{22.4}[/tex] = 0.65mole of CO₂
solution of nitric acid is 60% with the specific gravity 1.15 calculate the volume of the seed required to prepare 250 ml semi normal solution
Answer:
This dilution problem uses the equation
M
a
V
a
=
M
b
V
b
M
a
= 6.77M - the initial molarity (concentration)
V
a
= 15.00 mL - the initial volume
M
b
= 1.50 M - the desired molarity (concentration)
V
b
= (15.00 + x mL) - the volume of the desired solution
(6.77 M) (15.00 mL) = (1.50 M)(15.00 mL + x )
101.55 M mL= 22.5 M mL + 1.50x M
101.55 M mL - 22.5 M mL = 1.50x M
79.05 M mL = 1.50 M
79.05 M mL / 1.50 M = x
52.7 mL = x
59.7 mL needs to be added to the original 15.00 mL solution in order to dilute it from 6.77 M to 1.50 M.
Explanation:
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3. Which of the following atoms would have the highest first ionization energy?
a. Li
b. Be
c. Na
d. Mg
4. What is the name of the phenomenon in which electrons are ejected from the surface of a metal when light shines on the metal?
a. Photoelectric effect
b. Diffraction
c. Quantization
d. Aufbau principle
10. How many core electrons does this element have? 1s2 2s2 2p5
a. 9
b. 4
c. 2
d. 5
11. The electron configuration for a chlorine atom is: 1s2 2s2 2p6 3s2 3p5. What electron configuration represents the electrons that make up only the valence electrons for a chlorine atom?
a. 1s^2 2s^2 2p^6
b. 3s^2 3p^5
c. 1s^2
d. 1s^2 2s^2 2p^6 3s^2
Answer:
3. d. Mg 4. a. Photoelectric effect 10. c. 2 11. b. 3s^2 3p^5
Explanation:
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Answer:
The 3rd Law
Explanation:
The rockets burns fuel, pushing down onto the ground which then creates equal force pushing it up.
Answer:
the answer is newtons 3rd law of motion (number 3)
Explanation:
.