The average atomic mass of copper is 63.55.
The correct option is B. 63. 55
What is copper?Copper is a chemical element with the symbol Cu. This is a metal that is a ductile, malleable, and good conductor of electricity.
Now,
The two isotopes of copper are:
63Cu with the isotopic mass 62.93
65Cu, with an isotopic mass of 34.93
63Cu has a 69.2% abundance.
65Cu has 30.8% abundance.
The average atomic mass of Cu will be
62.93×69.2% + 64.93×30.8% = 63.55 amu.
Thus, the average atomic mass of copper is 63.55.
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Suppose you were given a substance and asked to determine whether it was a plasma. What characteristics would be true of the substance for it to be a plasma? Check all that apply.
Answer:
plasma flows but is a solid
Explanation:
example toothpaste flows but is a solid
For the process 2SO2(g) O2(g) Right arrow. 2SO3(g), Delta. S = –187. 9 J/K and Delta. H = –198. 4 kJ at 297. 0 K are known. What is the entropy of this reaction? Use Delta. G = Delta. H – TDelta. S. –386. 3 J/K –198. 4 kJ/K –187. 9 J/K –139. 3 kJ.
[tex]\rm -187.9 \;J/K[/tex]entropy of the reaction.
Entropy is the amount of heat or temperature inaccessible for the system to work and convert the chemical or thermal energy into mechanical energy.
How to calculate the entropy?Given,
[tex]\rm \Delta S[/tex] = [tex]\rm -187.9 \;J/K[/tex][tex]\rm \Delta H[/tex] = -198.4 kJTemperature (T) = 297.0 KThe balanced reaction can be shown as,
[tex]\rm 2SO_{2}(g) + O_{2}(g) \rightarrow 2SO_{3}(g)[/tex]
The Gibbs free energy can be calculated as:
[tex]\rm \Delta G = \Delta H - \rm T\Delta S[/tex]
Here,[tex]\rm \Delta G[/tex] = gibbs free energy, [tex]\rm \Delta H[/tex] = change in enthalpy, T = temperature and [tex]\rm \Delta S[/tex] = change in entropy.
Substituting values in the equation:
[tex]\begin{aligned}\rm \Delta G &= -198400 \;\rm kJ -297 \times (-187.9\;\rm kJ/mol)\\\\\rm \Delta G &= -198400 + 55806.3\\\\\rm \Delta G &= - 142593.7 \;\rm kJ\end{aligned}[/tex]
Therefore, [tex]\rm -187.9 \;J/K[/tex] is the entropy [tex](\rm \Delta S)[/tex] of the reaction.
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How many moles of carbon dioxide are produced from the reaction of oxygen with four moles of propane (C3H8)? C3H8 + 502 —> 3CO2 + 4H2O
Answer:
12 moles
Explanation:
1. Do comparison
From the equation, 1 mole of C3H8 yields 3 moles of CO2
Therefore, 4 moles of C3H8 should yield 12 moles of CO2
Steps:
Number of moles of CO2
= (1 mol x 4) x 3
= 12 moles
define malleable pls!
Answer:
The property of metal is that a piece of metal can be changed into a sheet by beating.
OR
The capable of being shaped or changed, whether physically or mentally is called malleable.
Explanation:
Describe the arrangement of ions in a crystal lattice.
Digits in a numerical value that are not placeholders
Leading zero is a digit in a numerical value that are not placeholders. Digits, which comprise 0, 1, 2, 3, 4, 5, 6, 7, 8, as well as 9, are employed to represent numbers.
What are numbers?An arithmetic value was using to represent a quantity and to do computations is known as a number. We use numbers to count things. For instance, in the image below, there are four butterflies and one butterfly.
An element's collection of no items is represented by the symbol "0," and we refer to it as zero. Digits, which comprise 0, 1, 2, 3, 4, 5, 6, 7, 8, as well as 9, are employed to represent numbers. We utilize a set of digits known called numerals to represent numbers. Leading zero is a digit in a numerical value that are not placeholders.
Therefore, leading zero is a digit in a numerical value that are not placeholders.
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A student prepares 150. 0 mL of 1. 40 M HCl using 35. 0 mL of a stock solution. What is the concentration of the stock solution? Use M subscript i V subscript i equals M subscript f V subscript f. 0. 327 M 4. 29 M 6. 00 M 7. 35 M.
6.00 M is the concentration of the stock solution.
Molarity or the molar concentration is the measure of the chemical species amount of solute in the solvent or the solution. The molarity of the solute is given by the moles and the volume in which it is dissolved.
How to calculate the concentration of the stock solution?Given,
The molar concentration of [tex]\rm HCl[/tex] [tex](\rm M_{1})[/tex] = 1.40 MThe volume of hydrochloric acid [tex](\rm V_{1})[/tex] = 150.0 mLThe molar concentration of stock solution = ?The volume of stock solution [tex](\rm V_{2})[/tex] = 35.0 mLThe molarity can be estimated by:
[tex]\rm M_{1}V_{1} = M_{2}V_{2}[/tex]
Substituting values in the formula:
[tex]\begin{aligned}1.40 \;\rm M \times 150.0 \;\rm mL &= \;\rm M_{2} \times 35.0 \;\rm mL\\\\\rm M_{2} &= \dfrac{210}{35}\\\\&= 6 \;\rm M\end{aligned}[/tex]
Therefore, 6.00 M is the concentration of the stock solution.
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Data that is collected that is mostly numbers?
Answer:
statistics
Explanation:
statistics is the study of using numbers to express data
What type of chemical bond can form between an atom with 11 protons and an atom with 17 protons?.
Distinguish between a electrolytic cell and voltaic(Daniel) cell.
Answer:
are cell which contain sulfuric acid while voltaic are cell which are dry.
The transfer of heat by mass motion in liquid and gas is referred to as convection |true or false?|
Answer:
True
Explanation:
Hope This Helps
Of the following, which constitutes the greatest percent of domestic use of water in the united states?.
Answer:
The answer is Flushing toilets.
Can you please describe 3 ways that are used to help eliminate a deception
Answer:
Explanation:
A story of self-deception, a story about deceiving others, and a story about accidental deception.
What is the range of accuracy for food temperature?.
Answer:
+ 2 degrees Fahrenheit
Explanation:
How many grams of potassium chloride, KCl, must be dissolved in 500.0 mL of solution to produce a 1.5 M solution?
Answer:
How many grams of potassium chloride, KCl, must be dissolved in 500.0 mL of solution to produce a 1.5 M solution? Answer: g 4. What is the molarity of a solution in which 84.0 grams of sodium chloride, NaCl, is dissolved in 1.25 liters of solution? Answer: M 5.
Explanation:
Describe the nature of electrochemical process.
Answer:
electrochemical process is a chemical reaction caused by the applied electrical current.
Explanation:
Electrochemical processes involve the transfer of electrons between chemical species, resulting in the conversion of chemical energy into electrical energy or vice versa.
Through redox reactions, chemical energy can be transformed into electrical energy or vice versa in electrochemical processes. They happen where an electrode and an electrolyte solution meet. In these procedures, electrons are moved from the electrode to the electrolyte, causing an electric current to flow.
While reduction takes place at the cathode, where electrons are obtained, oxidation happens at the anode, where electrons are expelled. Numerous applications, such as batteries, fuel cells, corrosion, electroplating, and electrolysis, depend on electrochemical processes.
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Your teacher gives you a sample of an unknown element which is sealed in a glass tube at room temperature. At the bottom of the tube there is a small amount, a few drops at the most, of a red-black filmy liquid, and above it is a red vapor. What is this element likely to be?.
The element is likely to be metal.
The substances that are pure and only consists of atoms are called elements. They are the smallest and the fundamental unit of the compound and cannot be split to form any entity.
What are metals?The metals are the elements that are good conductors of charge, electricity, are opaque, malleable, lustrous and ductile. They have high density and melting points. They differ from the non-metals and metalloids based on their physical and chemical properties.
The metals are more likely to donate and gain electrons to form complexes and can produce transitions. The electron gets excited when the energy is given in the form of heat and electricity and thus when comes to the ground state gives a distinct colouration.
Therefore, the element is likely to be metal.
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What is the freezing point of silver?
Answer:
1,763°F
Explanation:
I really cant explain it is a little complicated but there is the answer hope it helped you a lot
Answer:
The uncertainty of the freezing plateau of silver is 2.044 mK, but drops to 2.996 mK for the melting plateau.
What is waste good for?
energy for decomposers
being stinky
food chain
A water molecule's shape resembles which of the following?
A)an oval
B)a circle
C)a square
D)a triangle
Answer:
the answer is D
Explanation:
i hope it's rite.
You have a sample of 75.6 g of C3Hg. How many moles of C3Hg are in the sample?
Answer:
0.3195 mole
Explanation:
Number of moles of C3Hg
= mass ÷ molar mass
= 75.6 g ÷ (12 + 12 + 12 + 200.6)
= 75.6 g ÷ 236.6
= 0.3195 mole
what is the valency of water
Answer:
In the water molecule oxygen combines with two hydrogens and so has a valency of 2. A simple diagram of a water molecule makes this plain. The hydrogen atoms are each sharing one pair of electrons - they have a valency of 1. The oxygen atom is sharing two pairs of electrons - it has a valency of 2.
Which two particles of the atom have nearly identical masses?.
Which term is defined as the fundamental particles of protons and neutrons?.
The approximate molar concentration of several chemicals are given. Find the pH of each. Use the calculator and round to the nearest tenth, if necessary. Oven cleaner: [H ] = 10−13 pH = Water: [H ] = 0. 0000007 pH = Blood: [H ] = 0. 00000004 pH = Vinegar: [H ] = 0. 0063 pH =.
The pH of the solutions given are:
Oven cleaner- 13Water- 6.15Blood- 7.39Vinegar- 2.20The pH can be defined as the hydrogen ion concentration of the solution. The pH can be calculated as the negative log of the hydrogen ion concentration in the solution.
What is the pH of solutions?The pH can be calculated as:
[tex]\rm pH=-log [H^+][/tex]
The pH of the following solutions is given as;
Oven cleaner[tex]\rm [H^+]=10^{-13}[/tex]
The pH of the oven cleaner is:
[tex]\rm pH =-log[10^{-13}]\\pH=13[/tex]
The pH of the oven cleaner is 13.
Water[tex]\rm [H^+]=0.0000007[/tex]
The pH of a water sample is:
[tex]\rm pH=-log \;[0.0000007]\\pH=6.15[/tex]
The pH of the water sample is 6.15.
Blood[tex]\rm [H^+]=0.00000004[/tex]
The pH of the blood sample is:
[tex]\rm pH=-log\;[0.00000004]\\pH=7.39[/tex]
The pH of the blood sample is 7.39.
Vinegar[tex]\rm [H^+]=0.0063[/tex]
The pH of the vinegar is :
[tex]\rm pH=-log\;[0.0063]\\pH=2.20[/tex]
The pH of the vinegar sample is 2.20.
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A chemical reaction in which bonds are broken is usually associated with ________. a chemical reaction in which bonds are broken is usually associated with ________. the consumption of energy forming a larger molecule a synthesis the release of energy
Answer:The answer to the question is the release of energy. The bonds that bind a molecules atom's act as a storage of energy. One way it is released is when those bonds are broken and it is released outward in every direction. This breakage results in smaller molecules and not the formation of a larger molecule.
Explanation:
Ola has a solution of pH 9. Should he add acid or alkali to neutralise the solution
Answer:
acid
Explanation:
7 is neutral if more than 7 add acid if less than 7 add alkali
Which has a higher vapor pressure hexane or nonane.
When a protein folds in the cytoplasm, what class of amino acids tends to be found in the interior core of the protein?.
Answer:
non-polar amino acid side chains Explanation: It is not very easy for me what about you???
the lewis dot structure rule states that S=N-A. recall that A represents the TOTAL number of valence electrons available from all the atoms in molecule. what is A from silicon tetrachloride, SiCL4
Answer: oh i thought i knew it nvm im sorry love
Explanation:
A, the total number of valence electron is 24 for Silicon Tetrachloride , SiCl₄ .
What is Lewis Dot Structure ?In Lewis Dot structure S=N-A is used to calculate the total number of shared and unshared electrons in a molecule.
S is the number of shared electrons ,N is the number of total valence shell electrons required by all the atom of the molecule, A is the total number of valence electrons available from all the atoms in the molecule
For SiCl₄,
• We have to first count the valence electron on each atom that is coming to form a molecule .
Valence electron on Si = 4
Valence Electron on Cl = 7
Total valence electron on SiCl₄ = 4+ 4 * 7 = 32
• Then we find the least electronegative atom in the molecule and place it at the center , In SiCl₄ , Si has 1.8 and Cl has 3.16 and so Si is placed at the center and four Cl atoms are connected with a single bond
• A single bond takes up 2 valence electron and so for four bonds 8 valence electrons have been occupied , so we are left with 32-8=24 valence electrons.
Therefore In the Lewis Dot structure S=N-A , Total number of valence electrons available from all the atoms in molecule of SiCl₄ is 24.
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