3 grams of Cu = 6.022 x 10^23 atoms of copper.
Answer:
2.84 × 10^22 atoms
Explanation:
To calculate the number of atoms in 3 grams of Cu, we can use avogadro's constant where:
[tex]1 \: mole = 6.02 \times 10 {}^{23} \: atoms[/tex]
Firstly, we have to calculate the number of moles in 3 grams of Cu. The formula to calculate moles is:
[tex]moles = \frac{mass}{molar \: mass} [/tex]
the mass = 3g and the molar mass = 63.55 (this value can be found in the periodic table)
Substitute the values in formula:
[tex]moles = \frac{3}{63.55} [/tex]
[tex]moles = 0.0472[/tex]
Now use the number of moles to convert to atoms using avogadro's number, where x is the unknown number of atoms we want to find:
[tex]1 \: mole : 6.02 \times 10 {}^{23} \: atoms[/tex]
[tex]0.0472 \: moles : x \: atoms[/tex]
Cross multiply and equate to solve for x:
[tex]1 \times x = 6.02 \times 10 {}^{23} \times 0.0472[/tex]
[tex]x = 6.02 \times 10 {}^{23} \times 0.0472[/tex]
[tex]x = 2.84 \times 10 {}^{22} \: rounded \: to \: 3sf[/tex]
Hence, there are 2.84 × 10^22 atoms in 3 grams of Cu
A 467. 8 ng sample of unknown radioactive substance was placed in storage and its mass measured periodically after 47 days the amount of radioactive substance had decreased 58. 48 ng how many half-lives of the non-radioactive substance have occurred
The amount of radioactive substance has decreased from 467.8 ng to 58.48 ng after 47 days, so 2.5 half-lives have occurred.
A radioactive isotope's half-life is the amount of time it takes for one half of the radioactive isotope to decay. A specific radioactive isotope's half-life is constant; it is unaffected by conditions and is independent of the initial amount of that isotope.
Half-life = 47/2.5 = 18.8 days
Decrease in Radioactive Substance = 467.8 - 58.48 = 409.32
Half-life amount = 409.32/2.5 = 163.728
Number of half-lives = 409.32/163.728 = 2.5
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If the garbage truck and minivan in Part A get into an accident with each other, how can safety restraints in a car can save a life? Explain your response using one of Newton’s laws.
Which of Newton’s laws of motion act upon the vehicles at the point of impact? Explain your answer
Newton's law of motion that act upon the vehicles at the point of impact is the second law of motion.
Newton's second law of motion states that the force applied to an object is directly proportional to the rate of change of momentum that is produced. Mathematically, we have;
F = m·v - m·u/Δt
Where;
m = The mass of the object
v = The final velocity of the object
u = The initial velocity of the object
Δt = The duration of motion of the object during change in velocity
Therefore, given that the mass, 'M', of the truck is larger than the mass, 'm', of the minivan, where the time of change in velocity Δt, and the initial and final velocities of both automobiles are the same such as in a sudden stop, the garbage ruck will exert more force than the minivan, and therefore, the garbage truck has a greater initial momentum before the automobiles are brought to a stop.
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can anyone just give me the answers!!
Answer:
1. P
2. A/B
3. A/B
4. R/O
5. P
6. R/O
7. A/B
8. P
9. R/O
10. R/O
Explanation:
Precipitation:
Ag (aq) + HCl (aq) → H₂ (g) + AgCl↓
Precipitation reactions can contain a single element.
Certainly, two soluble solutions are mixed, forming an insoluble solid.
Reactions can be identified using a solubility chart, because solubility can affect the precipitacion's equilibrium.
Acid base:
Certainly you mix an acid(H+) an a base (OH-)
We talk about neutralization because we make water. And, there is also a formed salt.
HNO₃ + KOH → H₂O + KNO₃
H⁺ + OH⁻ ⇄ H₂O Kw
Redox:
This is the reaction where moles of electrons are transferred and gained.
A pure element is consumed or formed. We have 2 half reactions:
- Reduction (oxidation state decreases, electrons are released)
- Oxidation (oxidation state increases, electrons are gaines)
Reactions involving pure O₂ are named combustion, which is a redox type.
This is an example of redox decomposition of hydrogen peroxyde.
2H⁺ + H₂O₂ + 2e⁻ → 2H₂O
H₂O₂ → 2H⁺ + O₂ + 2e⁻
H₂O₂ → 2H₂O + O₂
What element has the largest radius?
Answer:
Francium
Hope this helps :)
What determines the properties of a substance?
The properties of a substance are determined by the arrangement of atoms in that substance.
A substance has two types of properties: physical and chemical properties.
The physical properties of a substance does not change the physical identity of the substance.
Examples of physical properties are density, color, boiling point, melting point and hardness.
Whereas the chemical properties are those properties which alter the substance completely and transforms it into a new substance or a compound.
For example, chemical reactions such as oxidation or reduction reactions, corrosion and flammability are chemical properties which occur when change in the arrangement of atoms take place.
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A compound with EF CH2O was found to have a molar mass between 89 and 91 g. What is the MF of the compound?
Answer:
89-91=1 the answer is 1molar mass
How does a battery become depleted or out of charge? * -the number of protons and electrons at both terminals are not equal -the number of protons and electrons at both terminals are equal -the number of protons and neutrons at both terminals are not equal -the number of protons and neutrons at both terminals are equal
Answer:
the number of protons and neutrons at both terminals are equal
Explanation:
When the number of positive charge and negative charge are both equally the terminal, it becomes neutral and out of charge, because first it undergo enough chemical reaction and there is no remaining tendency for positive and negative charges to get separated. When this tendency dies, the battery also will run out of charge.
Fusion is safer than fussion because....
A. a fusion reaction will stop on its own if something goes wrong
B. a fusion recrion creates waste material that is easier to store than fission
Answer: B, a fusion recrion creates waste material that is easier to store than fission.
Fusion produces far less harmful waste than fission does. The reliance of something independent like whether a reaction will stop on its own when something goes wrong is never indefinite (technological failures are unpredictable and destructive a lot of the time when it comes down to nuclear power).
Container A holds 747 mL747 mL of ideal gas at 2.90 bar2.90 bar . Container B holds 119 mL119 mL of ideal gas at 4.30 bar4.30 bar . If the gases are allowed to mix together, what is the partial pressure of each gas in the total volume
the partial pressure of gas A in the total volume is 3.57 bar, and the partial pressure of gas B in the total volume is 0.70 bar.
When the gases are allowed to mix together, the total pressure of the mixture is equal to the sum of the partial pressures of each gas. The partial pressure of each gas is equal to the product of the total pressure and the mole fraction of that gas. To find the mole fraction of each gas, we first need to find the number of moles of each gas. The number of moles of gas in container A is given by PV/RT where P is the pressure, V is the volume, R is the ideal gas constant and T is the temperature.
n_A = (2.90 bar * 747 mL) / (8.314 J/molK * (273.15 + 23)) = 0.0295 mol
The number of moles of gas in container B is given by PV/RT
n_B = (4.30 bar * 119 mL) / (8.314 J/molK * (273.15 + 23)) = 0.0045 mol
The total number of moles of gas in the mixture is the sum of the number of moles of gas in container A and container B.
n_total = n_A + n_B = 0.0295 mol + 0.0045 mol = 0.0340 mol
The mole fraction of gas A in the mixture is the number of moles of gas A divided by the total number of moles of gas.
x_A = n_A / n_total = 0.0295 mol / 0.0340 mol = 0.8735
The mole fraction of gas B is
x_B = n_B / n_total = 0.0045 mol / 0.0340 mol = 0.1324
The partial pressure of gas A is equal to the total pressure multiplied by the mole fraction of gas A.
P_A = (0.8735) * (2.90 bar + 4.30 bar) = 3.57 bar. The partial pressure of gas B is equal to the total pressure multiplied by the mole fraction of gas B. P_B = (0.1324) * (2.90 bar + 4.30 bar) = 0.70 bar
So the partial pressure of gas A in the total volume is 3.57 bar, and the partial pressure of gas B in the total volume is 0.70 bar.
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Are two atoms of the same element identical??
Protactinium-234 has a half-life of 1 minute. How much of a 400. g sample protactinium would remain after 4 minutes
After 4 minutes, 200 g of protactinium-234 would remain.
What is protactinium-234?Protactinium-234 is a radioactive isotope of protactinium. It is a fission product that is produced when uranium atoms undergo fission. It has a half-life of 1.17 minutes and decays via beta-decay to uranium-234. It is the most stable isotope of protactinium and is found in very small quantities in uranium ore. The main uses for protactinium-234 are for research, nuclear medicine and nuclear power. In research, it can be used to study properties of fission products and to measure the efficiency of nuclear reactors. In nuclear medicine, it can be used to detect cancers and other conditions. Finally, it can be used in nuclear power plants to help regulate and control the flow of energy.
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HELP!!!
Help,help,help,help,help, Help,help,help,help,help, Help,help,help,help,help, Help,help,help,help,help, Help,help,help,help,help, Help,help,help,help,help…
Answer:
no
Explanation:
What is the pH of a 7.5 × 10-3 M Ba(OH)2 solution at 25°C?
a. 0.015
b. 1.82
c. 12.18
d. 11.88
A 7.5 10-3 M Ba(OH)2 solutions at 25°C has a pH of 1.82. (option b).
What exactly is a solution exemplar?A homogenous solution of two or more ingredients with particles smaller than one nm is referred to as a solution. Solutions come in many forms, such as soda water, salt and sugar solutions, etc. In a solution, every element appears as a single phase.
What is the ideal definition of a solution?In chemistry, a solution is a homogeneous mix of two or more molecules in relative proportions that can be constantly changed up to what is known as the limit of solubility. Although the term "solution" is frequently used to refer to the liquid state of matter, solutions of gases and solids are also possible.
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PLS HELP ME WITH QUESTION 5 I NEED HELP ASAP
Answer:
30.5%
Explanation:
Balance the entire chemical reaction using an atom inventory. What is the coefficient for ammonia,
NH3? [?]NH3 + [ ]02 →→ []NO + H₂O
The coefficient of ammonia in the above chemical equation is 3.
What is a balanced equation?A chemical equation is said to be balanced when the number of the atoms involved in the reactants side is equal to the number of atoms in the products side.
Balancing chemical equations involves the addition of stoichiometric coefficients to the reactants and products.
According to this question, ammonia reacts with oxygen gas to produce nitrogen oxide and water as follows:
4NH₃ + 50₂ → 4NO + 6H₂O
Based on the above balanced equation, it can be said that the coefficient of ammonia is 4.
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A second row element has a large jump between its third and fourth ionization energies. What is the element
Be is the second element with two valence elements When a core electron is eliminated, the energy of ionization increases. From an element's electrical configuration, it is simple to see a significant change in ionization energy.
Electronically, beryllium is configured as 1s2 2s2. The outermost shell of beryllium has two valence electrons, hence the data on ionization energy will show a sharp rise or leap from the second to the third ionization energy due to the elimination of a core electron. Nitrogen has the following electrical configuration: 1s2 2s2 2p3. The outermost shell of nitrogen has five valence electrons, thus when one of them is removed, the ionization energy data for nitrogen will show a sharp rise or leap from the fifth to sixth ionization energy.
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statement about isomers is true?
Isomers contain the same number of electrons and neutrons, but different numbers of protons.
Isomers contain the same number of protons, but different numbers of neutrons.
Isomers have the same chemical formula, but different structures.
Isomers have the same formula weight, but different nuclear distributions.
Statement about isomers which is true is that isomers have the same chemical formula, but different structures.
What is chemical formula?Chemical formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols of elements. It also makes use of brackets and subscripts.
It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.
There are four types of chemical formula:
1)empirical formula
2) structural formula
3)condensed formula
4)molecular formula
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How many orbitals are described by each of the below combinations of quantum numbers? n = 3, ℓ =2 orbitals n = 4, ℓ = 2, mℓ = 2 orbitals
Orbitals that are described by each of the combinations quantum numbers ; n = 3, ℓ =2 orbitals n = 4, ℓ = 2 is 5. ml=2 here is referring to last(5th) orbital space 4d.
What is orbitals?In atomic theory and quantum mechanics, atomic orbital is a function describing the location and wave-like behavior of electron in an atom.
Quantum numbers (n, l, ml, ms )
n=3, refers to 3rd energy level
3rd energy level has 3 possible values of l and d has 5 different orientations.
s=0 p=1 d=2
--> -2,-1,0,1,2
When; n=3 l=2, then number of orbitals is 5.
n=4 refers to 4th energy level ;
4th level has 4 possible l values;
s=0 p=1 d=2 f=3
When, n=4 l=2 and ml=2
The number of orbitals is 5 and ml=2 is referring to last(5th) orbital space 4d.
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The function t=f(a) models the time, in minutes, for a chemical reaction to occur as a function of the amount a of catalyst used, measured in milliliters. What are the units for f′′(a) ?
The unit of f''(a) is milliliters/minute^2
The function t=f(a) models the time, in minutes, for a chemical reaction to occur as a function of the amount a of catalyst used, measured in milliliters.
So, here double differentiation is to be done.
t=f(a)
differentiating with respect to t,
d(t)/dt = d(f'(a))/dt
or, d(f'(a))/dt = 1
again differentiating with respect to t,
d [d(f'(a))/dt]/dt = d(1)/dt = 0 ...1
or, f''(a) = 0
so, here if we put 'unit expression' in Left hand side of 1
it is d [d(f'(a))/dt]/dt i.e. mililiters/miniute/minute [as given t is measured in minute and f(a) is measured in ml)
or, ml/minute^2
so as we are performing double differentiation, the unit of f''(a) is milliliters/minute^2
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A double replacement reaction will occur is a precipitate is formed, or a gas is formed, or a ________ is formed.
A double replacement reaction will occur is a precipitate is formed, or a gas is formed, or a solvent is formed.
What is solvent?Solvent is a substance that is capable of dissolving other substances, resulting in a homogeneous mixture. Solvents are used in many industrial and household processes, including cleaning, extraction, and purification. Common solvents include water, alcohols, ketones, acids, and bases. Solvents can be used to dissolve both organic and inorganic substances. They are often used to separate mixtures of different substances, as well as to dissolve and purify them. Some solvents are miscible with one another, while others are not. Solvents can also be used to dissolve and disperse solids in a liquid.
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1.1 L of nitrogen dioxide were produced in the reaction seen below. How
many liters of oxygen gas were used if the reaction occurred at STP?*
2N0 + 02 --> 2NOZ
O 22.4L
O 2.2L
O 0.55L
O 17.6L
What are the branches of multi national company called?
Explanation:
decentralized multinational corporations, centralised global corporations, international companies, and transnational enterprises.
53. Name Compounds Name the following
compounds using IUPAC nomenclature rules:
A.CaCO3
Answer:
[tex]\small\mathfrak\green{calcium \: carbonate} \\ \\ \small\mathfrak\red{hope \: it \: helps...}[/tex]
Select True or False: The rates of radioactive decay processes, like the rates of chemical reactions, are sensitive to temperature changes.
Answer: False
Explanation:
3.20 g of magnesium reacts with hydrochloric acid, generating
hydrogen gas according to the reaction below. The hydrogen
gas is collected over water.
Mg(s) + 2HCl(aq) MgCl2(aq) + H2(8)
If 2.97 L of hydrogen gas is collected at 760.0 mmHg and
20°C, what was the percent yield of the reaction?
Answer: 93.8
Explanation: hope you have Wonderful grades!!
True or false: Energy and matter are the same thing.
Answer:
yes they are same thing by E=MC^2 EINSTEIN'S EQUATION
Answer:
True.
Explanation:
The mass of these three particles is less than the mass of a neutron, so they each get some energy as well. So energy and matter are really the same thing. Completely interchangeable. And finally, Although energy and mass are related through special relativity, mass and space are related through general relativity.
So energy and matter are really the same thing. Completely interchangeable. And finally, Although energy and mass are related through special relativity, mass and space are related through general relativity. ... So in a way, energy, matter, space and time are all aspects of the same thing.
Chlorine has an average atomic mass of 35.45 amu. The two natrually occuring isotopes of chlorine are chlorine-35 and chlorine-37. why does this indicate that most chlorine atoms contain 18 nuetrons?
Most chlorine atoms contain 18 neutrons as mole ratio of chlorine-35 and chlorine-37 is more than 1.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
let the moles of chlorine-35 is n1 and chlorine-37 is n2
now we will use the formula of average atomic mass
M=n₁M₁+n₂M₂/n₁+n₂
let say, n₁/n₂=x
substitution gives,35.45=x(35)+37/x+1 which on solving gives x=3.44
since mole ratio is more than 1, that's why most chlorine atoms have 18 neutrons.
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Drag each statement to the correct location on the chart. Classify the sentences based on the chemical reactions they describe. When a clam shell (CaCO3) is heated, carbon dioxide (CO2) is given off and a white powder, calcium oxide (CaO), forms.> Nitrogen pentoxide (N2O5) is an unstable gas that changes to nitrogen dioxide (NO2) and oxygen (O2) at room temperature. Sodium (Na) reacts with chlorine (Cl) to give sodium chloride (NaCl). Zinc (Zn) metal reacts with copper sulfate (Cu2SO4) to give zinc sulfate (ZnSO4) and copper (Cu). A strip of magnesium (Mg) burns brightly in oxygen (O2) to form a white powder, magnesium oxide (MgO). On heating iron ore (Fe2O3) with carbon (C), we get iron (Fe) and carbon dioxide (CO2).
Answer:
Synthesis-
3. Sodium (Na) reacts with chlorine (Cl) to give sodium chloride (NaCl).
6. On heating iron ore (Fe2O3) with carbon (C), we get iron (Fe) and carbon dioxide (CO2).
5. A strip of magnesium (Mg) burns brightly in oxygen (O2) to form a white powder, magnesium oxide (MgO).
Decomposition -
1. When a clam shell (CaCO3) is heated,carbon dioxide (CO2) is given off and a white powder, calcium oxide (CaO), forms.
2. 'Nitrogen pentoxide (N2O5) is an unstable gas that changes to nitrogen dioxide (NO2) and oxygen (O2) at room temperature.
Replacement -
4. Zinc (Zn) metal reacts with copper sulfate (Cu2SO4) to give zinc
sulfate (ZnSO4) and copper (Cu).
Explanation:
07
This question is about elements.
Caesium is in Group 1 of the periodic table.
0 7
1
Explain what happens to caesium atoms and to oxygen atoms when caesium reacts
with oxygen to produce caesium oxide.
You should answer in terms of electrons.
[4 marks]
Answer:
Caesium will lose an electron and oxygen will gain an electron
The caecum is a chemical element of atomic number 55 and is a soft and golden alkali metal.
The electrons are transformed from the alkali metal to the oxygen meta that results in distinctions. They both combine to form a network of compounds with a distinct pattern. The cerium oxide is an inorganic compound of oxygen and the cesium reaction of both will form the ionic compound.Learn more about the about elements, cesium is of the periodic table.
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Leandra is learning about chemical reactions and she wants to examine the information that is included in a chemical equation. Which pieces of information does a chemical equation include
The pieces of information a chemical equation includes are:
The kind of molecules that are involved in the process. The several constituents that form a molecule.Whether or not the products are heavier than the reactants.A chemical equation is a graphical representation of a chemical process that employs symbols and chemical formulas. Reactant entities appear on the left, as well as product entities appear on the right, with a plus sign connecting the entities in both the reactants and the products and an arrow pointing towards the products to show the direction of the reaction.
Chemical formulae can be symbolic, structural (pictorial diagrams), or a combination of the two. The absolute values of the stoichiometric numbers are represented by the coefficients adjacent to the symbols and formulae of entities. Jean Beguin drew the very first chemical equation in 1615.
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