Answer:
Its lysogenic cycle if a virus integrates its DNA into host cell.
Explanation:
Bacteriophages are the viruses which infect bacteria. Viruses are obligatory parasites which need host for their survival. Viruses which infect bacteria can either take up the lytic cycle or lysogenic cycle. Lytic as the name suggests involves the lysis of host bacterial cell after the replication of virus. Once the bacterial cell is lysed and the virions are released they invade another host bacterial cell. In the other case i.e. lysogenic cycle, the bacteriophage after infecting the host bacterial cell integrates its genome into the host cell genome. At this stage we call it as prophage. The viral genome gets replicated with the host cell machinery but does not produces the viral protein and remains dormant with in the host cell. The integrated genome of virus is passed on to the daughter cells as the cell division occurs. Once the bacterial host cell condition becomes progressively worse, the reproductive cycle of virus begins resulting in the lysis of host cell.
What is a chemical reaction?
Hello There!
A chemical reaction is when one or more molecules combine and rearrange to create one or more molecules or substances.
A chemical reaction is when a reaction occurs that changes the make-up (basically what makes something that thing. For example you have chemical make-up that makes you you. If that make up changed then you wouldn't be you anymore) making what ever was reacted into a NEW product
For example digestion is a chemical reaction. Let's say that you eat a carrot. When digestion (the chemical reaction) is complete the carrot is no longer how it was when your first put it in your mouth. It has been broken down and the acid in your belly changed the chemical make up so that your body can use the carrot for energy
Now let's say that you shred a piece of paper. This is NOT a chemical reaction, because the shredded paper is still the paper it was before it was shredded
Hope this helped!
~Just a girl in love with Shawn Mendes
What causes the appearance of lines in a emission spectrum
Answer:The appearance of lines in an emission spectrum is caused by the fact that light is released as an electron moves to a lower energy state. When the atoms absorb energy they get excited and reach a higher level of energy. Then, when those atoms that are unstable release energy they pass to a lower level and emit light.
The appearance of lines in an emission spectrum is caused by the gas cloud on its own, without a light source behind it.
What is an emission spectrum?The emission spectrum of a chemical element or chemical compound is the spectrum of frequencies of electromagnetic radiation emitted due to an electron making a transition from a high energy state to a lower energy state. The photon energy of the emitted photon is equal to the energy difference between the two states. There are many possible electron transitions for each atom, and each transition has a specific energy difference. A gas cloud on its own, without a light source behind it, produces a line emission spectrum. When gas is cool, it absorbs the same wavelengths of light as it would emit when it is hot.Hence, the appearance of lines in an emission spectrum is caused by the gas cloud on its own, without a light source behind it.
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A 650 mL sodium bromine solution has a bromide ion concentration of 0.245 M. What is the mass (g) of sodium bromide in solution?
A) 103.
B)0.00155.
C)16400.
D) 16.4.
E) 0.159
Answer:
The correct answer is D: 16.4 g
Explanation:
Look at the balanced equation of NaBr, It has 1:1 between Na and Br.
NaBr ---> Na+ and Br-
If the solution has 0.245 concentration of bromide ions then the solution has 0.245 concentration of sodium ions as well. Which means both have equal concentration. So the molarity of solution is 0.245 M.
Convert volume in dm3.
650ml = 650 cm3
650cm3/ 1000cm3 x 1dm3 = 0.65 dm3
Mass of a solute (g) = Molarity x Molar mass of solute x volume in dm3
= 0.245 M X 102.89 g/mol x 0.65 dm3
= 16.38 = 16.4 g
Answer:
The correct answer is D) 16.4.
The mass of sodium bromide in solution is 16.4 g
Further Explanation:
Molarity may be defined as the concentration of a solution in moles per liter. It is calculated by dividing the number of moles of a solution, n by its volume in liters, V. That is; Molarity = n/V
Therefore; when given the molarity of a solution and the volume of the solution then we can get the number of moles, by multiplying the molarity by volume; n = MV.
Additionally, the number of moles of a compound or an element can also be calculated by dividing the mass of the compound by its relative molecular mass.
In this question, we are given;
Molarity of a bromide ion = 0.245 M
But the dissociation of sodium bromide is;
NaBr(aq) → Na+(aq) + Br-(aq)
Therefore, the molarity of NaBr is 0.245 M since the mole ratio of NaBr : Br- is 1: 1.
Hence; Number of moles of NaBr = Molarity × volume
= 0.245 M × 0.650 L
= 0.15925 moles
But; number of moles = mass/ molecular mass
Molecular mass of NaBr is 102.894 g/mol
Therefore;
Mass of NaBr = Number of moles × molecular mass
= 0.15925 × 102.894 g/mol
= 16.385 g
≈ 16.4 g
Thus, the mass of sodium bromide in solution is 16.4 g
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Grade: Middle School
Subject: Chemistry
Chapter: Mole and stoichiometry equations
Keywords: Molarity, moles, sodium bromide, molecular mass and volume.
what are compounds?
Answer:
a thing that is composed of two or more separate elements; a mixture.
Explanation:
If you doubled the volume of a sample of gas and
then doubled the volume again without changing
its pressure, how would the absolute temperature
of the gas be affected?
a
What pressure must be applied to keep a gas at
750 torr and 300 K at a constant volume of 200
mL if the temperature is raised to 450 K?
Answer:
1125mL
Explanation:
this can be done using general gas law
Answer:
The absolute temperature of the gas will be affected by a fourfold increase.
The pressure must be applied at 450 K should be 1,125 torr.
Explanation:
Charles's Law consists in the relationship between the volume and temperature of a certain amount of ideal gas, which is maintained at a constant pressure, by means of a constant of proportionality that is applied directly. For a given sum of gas at a constant pressure, as the temperature increases, the volume of the gas increases and when the temperature decreases, the volume of the gas decreases because the temperature is directly related to the energy of the movement of the gas molecules .
In summary, Charles's law is a law that says that when the amount of gas and pressure remain constant, the ratio between volume and temperature will always have the same value:
[tex]\frac{V}{T} =k (constant)[/tex]
If you double the volume of a gas sample and then doubled the volume again, then the volume was increased four times. To comply with Charles's Law and maintain the relationship between volume and constant temperature, the temperature must increase four times, in the same way as volume.
So the absolute temperature of the gas will be affected by a fourfold increase.
Gay-Lussac's law can be expressed mathematically as follows:
[tex]\frac{P}{T} =k[/tex]
Where P = pressure, T = temperature, K = Constant
This law indicates that the ratio between pressure and temperature is constant.
This law indicates that, as long as the volume of the container containing the gas is constant, as the temperature increases, the gas molecules move faster. Then the number of shocks against the walls increases, that is, the pressure increases. That is, the gas pressure is directly proportional to its temperature.
In short, when there is a constant volume, as the temperature increases, the gas pressure increases. And when the temperature decreases, gas pressure decreases.
When studying two different states of a gas, you have a gas that is at a pressure P1 and at a temperature T1 at the beginning of the experiment. When the temperature varies to a new T2 value, then the pressure will change to P2. This is true:
[tex]\frac{P1}{T1} =\frac{P2}{T2}[/tex]
So in this case, as the volume is constant, Gay-Lussac's law can be applied as follows:
[tex]\frac{750 torr}{300 K} =\frac{P2}{450 K}[/tex]
Then
[tex]P2=\frac{750 torr}{300 K} *450 K\\[/tex]
P2=1,125 torr
The pressure must be applied at 450 K should be 1,125 torr.
what is the basis of a metallic bond
A the neutralization of protons by electrons
B the attraction of metal ions to mobile electrons
C the attraction of oppositely charged ions
D the attraction between neutral metal atoms
Answer:
It's B.
Explanation:
Hope my answer has helped you!
Answer:
B the attraction of metal ions to mobile electrons
Explanation:
Metal bonding occurs when metals are combined with each other. Metal atoms need to give up electrons to reach the configuration of a noble gas. In this case, the metals lose the valence electrons and an electron cloud (also called electron sea) is formed between the positive nuclei
Metals tend to lose the electrons of the last level forming positive ions. When ions are grouped neatly forming a network that is surrounded by the cloud of ceded electrons and a metallic bond is formed
Therefore the correct answer is the B the attraction of metal ions to mobile electrons
How many electrons are represented by a dash (-) in a lewis dot structure compound
Answer:
nstead of using two dots to indicate the two electrons that comprise the covalent bond, a line is substituted for the two dots that represent the two electrons. Below is shown the Lewis structure for water. Two hydrogens (H) are separately covalently bonded to the central oxygen (O) atom.
Explanation:
The total number of electrons that are represented by a dash (-) in a Lewis dot structure compound is 2(Two).
What is the Lewis dot structure compound?Lewis structures, also known as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, are diagrams that show the bonding between atoms of a molecule, as well as the lone pairs of electrons that may exist in the molecule.A single dot represents one electron. A dash typically represents 2 electrons, and typically represents a covalent bond, i.e. shared electron density between two positively charged atomic nuclei. Most of the time we represent the valence electrons only.So, the total number of electrons that are represented by a dash (-) in a Lewis dot structure compound is 2(Two).
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What is the most striking part of the Rutherford scattering stimulation?
Answer:
bye
Explanation:
is cutting your nails a physical or chemical change
Cutting of Nails is a physical change since no new substance is formed.
Is it hygienic to cut nails?Proper hand hygiene involves careful cleaning and trimming of the nails, which carry dirt and germs and can contribute to the spread of some infections such as helminths. The nails should be short and the underside should be cleaned frequently with soap and water.
For most people, if you don't trim your nails, your nails will be longer at first. “If you don't trim your nails, your nails will continue to grow,” he says. James Christina, Executive Director and CEO of the American Podiatric Medical Association. "It's like the hair on your head."
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Describe how you would prepare 500.0mL of an aqueous solution that is 30.0% isopropyl alcohol by volume
Answer:
The solution can be prepared by adding 150.0 mL of isopropyl alcohol to 350.0 mL of water to make 30.0% isopropyl alcohol aqueous solution.
Explanation:
∵ The volume% of a solution = [(volume of the solute(isopropy)/(volume of the solution)] x 100.
The volume % = 30.0%, volume of the solution = 500.0 mL.
∴ Volume of the solute = (the volume% of a solution)(volume of the solution)/100 = (30.0%)(500.0 mL)/100 = 150.0 mL.
∵ The volume of solution = volume of the solute + volume of water
∴ Volume of water = volume of the solution - volume of the solute = (500.0 mL) - (350.0 mL) = 150.0 mL.
So, the solution can be prepared by adding 150.0 mL of isopropyl alcohol to 350.0 mL of water to make 30.0% isopropyl alcohol aqueous solution.Final answer:
To prepare a 500.0mL solution of 30.0% isopropyl alcohol by volume, measure 150.0 mL of pure isopropyl alcohol, add it to a 500 mL volumetric flask, fill the flask to the mark with distilled water, and mix well.
Explanation:
To prepare 500.0mL of a 30.0% isopropyl alcohol by volume aqueous solution, you'll need to calculate the volume of pure isopropyl alcohol required and then make up the rest of the volume with water. Here is a step-by-step procedure:
Calculate the volume of isopropyl alcohol needed: Since the solution needs to be 30.0% isopropyl alcohol by volume, this means 30.0% of the final solution's volume should be pure isopropyl alcohol. For 500.0 mL of solution, 30.0% of 500.0 mL is 150.0 mL. Therefore, you need 150.0 mL of isopropyl alcohol.Measure 150.0 mL of pure isopropyl alcohol using a graduated cylinder and transfer it into a 500 mL volumetric flask.Fill the volumetric flask with distilled water up to the 500 mL mark. This step ensures that the final volume of the solution is exactly 500.0 mL, making the solution 30.0% isopropyl alcohol by volume.Cap the flask and invert it several times to mix the solution thoroughly.By following these steps, you will have successfully prepared a 500.0mL solution of 30.0% isopropyl alcohol by volume.
PLEASE ANSWER THIS QUESTION ASAP 50 POINTS
PLEASE EXPLAIN HOW YOU GOT YOUR ANSWER
Which describes energy changes during nuclear fission?
A very large amount of energy is produced from a tremendous mass.
A very large amount of energy is produced from a series of chemical reactions.
A very large amount of energy is produced from a very small mass.
Answer:
A very large amount of energy is produced from a series of chemical reactions.
Explanation:
Nuclear fission is the process of splitting apart nuclei (usually large nuclei). When large nuclei, such as uranium-235, fissions, energy is released. So much energy is released that there is a measurable decrease in mass, from the mass-energy equivalence. This means that some of the mass is converted to energy.
Answer:
2nd option
Explanation:
Nuclear fission is the process of splitting apart nuclei (usually large nuclei). When large nuclei, such as uranium-235, fissions, energy is released. So much energy is released that there is a measurable decrease in mass, from the mass-energy equivalence. This means that some of the mass is converted to energy.
Modern atomic theory states that atoms are neutral. How is this neutrality achieved?
Answer:
by equal number of protons and electrons it balances it out
Due to interaction of proton particle and electron particle, neutrality in atom is achieved.
Explanation:It is a common known statement that matter is composed of atom, and atom is composed of particles called as electron, neutron, and proton. The atoms are considered as charged particles due to the presence of charges on its composition molecules.
The electrons are negative charged particles whereas the protons are positively charged particles. The number of protons and electron in an atom remains equal. Due to this condition, all the protons react with the entire electron leading to a condition called neutrality.
__________ is the most widely used method of formally measuring public opinion.
A. Face-to-face interviewing
B. Polling
C. The census
D. Democratic elections
Answer:
B. Polling is the most widely used method of formally measuring public opinion.
Answer:
B. Polling
Explanation:
The most widely sued method to obtain data without any time lag or any sort of problem and the privacy of the respondents are considered accordingly. The public opinion cannot take face to face thus this method is most suitable for large masses. It helps to gather data quickly is cost-effective and does not allow much biasness. Polling can be done on any subject any topic.If you have 35.0g of Na and 100.0g of Cl2, what is the maximum amount of NaCl that you can produce?
2Na + Cl2 → 2NaCl
57.7 g
165 g
75.8g
89.0 g
HELPP PLEASE
Answer:
89.0 g.
Explanation:
The balanced chemical equation between CuO and HCl is:2Na + Cl₂ → 2NaCl,
It is clear that 2 mol of Na react with 1 mol of Cl₂ to produce 2 mol of NaCl.
Firstly, we need to calculate the no. of moles of (35.0 g of Na) and (100.0 g Cl₂):
no. of moles of Na = mass/molar mass = (35.0 g)/(22.989 g/mol) = 1.522 mol.
no. of moles of Cl₂ = mass/molar mass = (100.0 g)/(70.906 g/mol) = 1.41 mol.
From the balanced equation: Na reacts with Cl₂ with (2: 1) molar ratio.
∴ 1.522 mol of Na "limiting reactant" reacts completely with 0.761 mol of Cl₂ "excess reactant".
To calculate the mass of the produced salt (CuCl₂):
2 mol of Na produces → 2 mol of NaCl, from stichiometry.
∴ 1.522 mol of Na produces → 1.522 mol of NaCl.
∴ The mass of the produced salt (NaCl) = (no. of moles)(molar mass) = (1.522 mol)(58.44 g/mol) = 88.95 g ≅ 89.0 g.
Final answer:
To find the maximum amount of NaCl produced from 35.0g of Na and 100.0g of Cl2, determine the limiting reactant and calculate the moles to find the answer of 75.8g.
Explanation:
To determine the maximum amount of NaCl that can be produced from 35.0g of Na and 100.0g of Cl2, you need to identify the limiting reactant in the reaction.
The molar mass of NaCl is 58.44g/mol, so we can calculate the moles of Na and Cl2 to see which one will run out first, limiting the amount of NaCl produced.
The maximum amount of NaCl that can be produced is 75.8g.
Given: K = °C + 273.15
What is the temperature of the flame in degrees Celsius?
You measure the flame of a candle and get a reading of 1,376.06 K. This value is equal to
Answer:
Tk=TC+273.15
so
1376.06=Tc+273.15
TC=1376.06-273.15
TC= =1,102.91
Answer: 1102.91 ºC
Explanation: To solve this problem, we only need to isolate the temperature in Celsius from the given equation:
TK=TºC+273.15
TºC=TK-273.15
now, replacing the temperature of the flame in K:
TºC=1376.06-273.15
TºC=1102.91 ºC
What is true of dynamic equilibrium?
Answer:
Dynamic equilibrium is a state in which reactant is converted into products at the same rate. At the beginning of a reaction, the reactants are converted to products and reaction goes into forwarding direction.
But in reversible reaction products start changing into reactants and reaction goes in the reverse direction until an equilibrium is reached. The state where the rates of all the reactants and products become equal and no more changes take place except the concentration is called dynamic equilibrium.
All the changes in dynamic equilibrium cancel out each other and the system seems to be at equilibrium.
Answer:
all the changes to a system cancel out
Explanation:
A P E X
what is 2 million divided by 8
Answer:
use a calculator please
Answer:
250,000
Explanation:
Exercise 2
1. A maths teacher bought 40 calculators at $8.20 each and a number
of other calculators costing $2.95 each. In all she spent $387.
How many of the cheaper calculators did she buy?
The teacher bought 20 cheaper calculators at $2.95 each after setting up and solving an algebraic equation that includes the total cost spent and the price of 40 more expensive calculators.
First, let's define the variables: Let x be the number of cheaper calculators that the teacher bought.
The problem states that the teacher bought 40 calculators at $8.20 each, so this cost is $8.20 times 40, and the other calculators cost $2.95 each, so this is $2.95 times x. The total cost is given to be $387.
We can set up the equation as follows:
Multiply the number of expensive calculators by their price: 40 calculators x $8.20/calculator = $328.Set up the equation with the total cost:[tex]$328 + (\$2.95 \times x) = \$387[/tex].Solve for x:$328 + $2.95x = $387
$2.95x = $387 - $328
$2.95x = $59
[tex]x = \frac{\$59}{\$2.95}[/tex]
x = 20
Therefore, the teacher bought 20 of the cheaper calculators.
Calcium hydride (CaH2) reacts with water to form hydrogen gas: CaH2(s) + 2H2O(l) → Ca(OH)2(aq) + 2H2(g) How many grams of CaH2 are needed to generate 45.0 L of H2 gas at a pressure of 0.995 atm and a temperature of 32 °C?
Answer:
37.67 g.
Explanation:
For the balanced reaction:CaH₂(s) + 2H₂O(l) → Ca(OH)₂(aq) + 2H₂(g).
It is clear that 1 mol of CaH₂(s) reacts with 2 mol of H₂O(l) to produce 1 mol of Ca(OH)₂(aq) and 2 mol of H₂(g).
We need to calculate the no. of moles of generated 45.0 L of H2 gas at a pressure of 0.995 atm and a temperature of 32 °C:
We can use the general law of ideal gas: PV = nRT.
where, P is the pressure of the gas in atm (P = 0.995 atm).
V is the volume of the gas in L (V = 45.0 L).
n is the no. of moles of the gas in mol (n = ??? mol).
R is the general gas constant (R = 0.0821 L.atm/mol.K).
T is the temperature of the gas in K (T = 32.0° + 273 = 305.0 K).
∴ n = PV/RT = (0.0995 atm)(45.0 L)/(0.0821 L.atm/mol.K)(305.0 K) = 1.79 mol.
Using cross multiplication:1 mol of CaH₂(s) produces → 2 mol of H₂(g), from stichiometry.
??? mol of CaH₂(s) produces → 1.79 mol of H₂(g).
∴ no. of moles of CaH₂(s) needed = (1 mol)(1.79 mol)/(2 mol) = 0.895 mol.
Now, we can get the mass of CaH₂ are needed:∴ mass of CaH₂ = (no. of moles)(molar mass of CaH₂) = (0.895 mol)(42.094 g/mol) = 37.67 g.
Approximately 37.5 grams of Calcium Hydride (CaH2) are needed to produce 45.0 L of Hydrogen gas at a pressure of 0.995 atm and a temperature of 32 °C.
Explanation:The subject of this question is the calculation of the mass of Calcium Hydride (CaH2) required to generate a specific volume of Hydrogen gas (H2) under certain conditions. According to the ideal gas law, PV = nRT, we can find the number of moles of hydrogen (n) needed. Given P=0.995 atm, V=45.0 L, R=0.0821 (the ideal gas constant in terms of atm, L, mol, K), and T = 32°C = 305.15 K, n = (P*V)/(R*T) which gives approximately 1.78 moles of hydrogen.
From the balanced chemical equation, we know that 1 mole of CaH2 produces 2 moles of H2. Therefore, we need 0.89 moles of CaH2 to produce 1.78 moles of H2. Knowing that the molar mass of CaH2 is approximately 42.1 g/mole, the mass needed can be calculated as: mass = moles * molar mass = 0.89 moles * 42.1 g/mole = approx. 37.5 g. Hence, approx. 37.5 grams of CaH2 are needed to generate 45.0 L of H2 at a pressure of 0.995 atm and a temperature of 32 °C.
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Select the correct answer.
You have a nightlight plugged into an outlet in the hallway, which uses 3.5 watts when plugged in. If the house circuit provides 120.0 volts, what is the
current through this bulb?
To find the current through the nightlight bulb, you can use Ohm's Law, which states that current (I) is equal to voltage (V) divided by resistance (R). The current through the bulb is approximately 0.02917 Amperes, or 29.17 milliamperes (mA).
Explanation:To find the current through the nightlight bulb, you can use Ohm's Law, which states that current (I) is equal to voltage (V) divided by resistance (R). In this case, the resistance is equal to the power (P) divided by the voltage (V). So, the current (I) can be calculated as follows:
I = P / V
Substituting the values given, we have:
I = 3.5 watts / 120.0 volts
Calculating this equation, we find that the current through the bulb is approximately 0.02917 Amperes, or 29.17 milliamperes (mA).
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How many grams of Na2O are produced when 70.7 g of Na reacts?
4Na(s)+O2(g)→2Na2O(s)
Answer:
95.3 grams.
Explanation:
Relative atomic mass data from a modern periodic table:
Na: 22.990;O: 15.999.How many moles of Na are consumed?
[tex]M(\mathrm{Na}) = \rm 22.990\; g\cdot mol^{-1}[/tex].
[tex]\displaystyle n(\mathrm{Na}) = \frac{m(\mathrm{Na})}{M(\mathrm{Na})} = \rm \frac{70.7\; g}{22.990\;g\cdot mol^{-1}}=3.07525\;mol[/tex].
How many moles of [tex]\mathrm{Na_2 O}[/tex] formula units will be produced?
Consider the ratio between the coefficient of [tex]\mathrm{Na_2 O}[/tex] and that of [tex]\mathrm{Na}[/tex] in the equation:
[tex]\displaystyle \frac{n(\mathrm{Na_2 O})}{n(\mathrm{Na})} = \frac{2}{4} = \frac{1}{2}[/tex].
As a result,
[tex]\displaystyle n(\mathrm{Na_2 O}) = n(\mathrm{Na}) \cdot \frac{n(\mathrm{Na_2 O})}{n(\mathrm{Na})} = \rm \frac{1}{2}\times 3.07525\;mol = 1.53763\; mol[/tex].
What will be the mass of that many [tex]\mathrm{Na_2 O}[/tex]?
Formula mass of [tex]\mathrm{Na_2 O}[/tex]:
[tex]M(\mathrm{Na_2 O}) = \rm 2\times 22.990 + 15.999 = 61.979\; g\cdot mol^{-1}[/tex].
[tex]m(\mathrm{Na_2 O}) = n(\mathrm{Na_2 O})\cdot M(\mathrm{Na_2 O}) = \rm 1.53763\; mol\times 61.979\; g\cdot mol^{-1} \approx 95.3\; g[/tex].
Answer: 95,3 g. would be produced, if the mass of Na = 70,7 g.
What is the total mass of copper consumed when 16.0 moles of water are produced?
3Cu + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O
Answer:
762.55 g.
Explanation:
For the balanced reaction:3Cu + 8HNO₃ → 3Cu(NO₃)₂ + 2NO + 4H₂O.
It is clear that 3 mol of Cu reacts with 8 mol of HNO₃ to produce 3 mol of Cu(NO₃)₂, 2 mol of NO, and 4 mol of H₂O.
We need to calculate the no. of moles of copper consumed when 16.0 moles of water are produced:Using cross multiplication:
3 mol of Cu produce → 4 mol of H₂O, from stichiometry.
??? mol of Cu produce → 16 mol of H₂O.
∴ no. of moles of Cu needed = (3 mol)(16 mol)/(4 mol) = 12 mol.
Now, we can get the mass of Cu needed:∴ mass of Cu = (no. of moles)(atomic mass of Cu) = (12 mol)(63.546 g/mol) = 762.55 g.
which type of orbitals are found in the principle enegery level n=3? a. S,d
b. s,p,d
c. s,p
d. s,p,f
e. s,d,f
Answer:
b. s,p,d
Explanation:
The type of orbitals found in the principal energy level n=3 is s, p and d orbitals.
Principal quantum number(n) denotes the energy level in which an orbital is located.
The principal quantum numbers takes values from n = 1, 2,3,4............
For example, the orbitals found in the principal quantum number with a value of 1 is s.
For n = 2, we have s and p
For n = 3, it is given as s, p and d
For n = 4, we have s, p, d and f
What type of particle is emitted by each type of radioactive decay?
A. alpha = nucleus of a helium atom
beta = photon
gamma = electron
B. alpha = electron
beta = nucleus of a helium atom
gamma = photon
C. alpha = nucleus of a helium atom
beta = electron
gamma = photon
D. alpha = electron
beta = photon
gamma = nucleus of a helium atom
C. alpha = nucleus of a helium atom
beta = electron
gamma = photon
Answer : The correct option is, (C) alpha = nucleus of a helium atom, beta = electron, gamma = photon
Explanation :
Alpha particle : It is also known as alpha radiation or alpha ray that consists of 2 protons and 2 neutrons that are bound together into a particle that is identical to the helium nucleus. It is produced in the process of alpha decay.
Beta particle : It is also known as beta radiation or beta ray. During the beta decay process, a high energy and speed electron or positron are emitted by the radioactive decay of atomic nucleus.
Gamma particle : It is also a gamma radiation or gamma ray that is arising from the radioactive decay of atomic nuclei. It has shortest wavelength waves and imparts high photon energy can pass through most forms of matters because they have no mass.
Hence, the correct option is, (C) alpha = nucleus of a helium atom, beta = electron, gamma = photon
What is the pressure of 0.5 mol of nitrogen gas in a 5 L container at 203 K
Answer:
=1.666 liters
Explanation:
1 mole of a has at standard temperature and pressure occupies a volume of 22.4 liters.
0.5 moles of nitrogen occupy a volume of (0.5 moles×22.4 dm³/mol)/ 1
=11.2 liters.
Standard pressure= 1 atmosphere (Atm)
Standard temperature = 273.15 Kelvin
According to Combined gas equation, P₁V₁/T₁=P₂V₂/T₂
Let us take the conditions under standard conditions as the reference, with the subscript 1 and the conditions under the 5L container to be scenario 2 with subscript 2.
Therefore P₂ =P₁V₁T₂/T₁V₂
Substituting for the values we get:
P₂= (1 atm× 11.2L ×203K)/ (273K×5L)
=1.666 atm
How many liters of water can be produced from 5.0
liters of butane gas at STP, assuming excess oxygen?
C4H10(g) + 02(g) → CO2 (e) + H2O (g)
Select all that apply to temperature and the kelvin scale.
-Scientists have been able to cool substance to absolute zero.
-0 K is equal to -273 degrees Celsius.
-Gas can have a volume of 0.
-The term “degree” is not used with the Kelvin scale.
-Cryogenics is the study of very low temperatures and their effects.
Answer: Option (2), (4) and (5)
Explanation:
Absolute zero refers to the temperature from which there occurs no cooling. Scientists have not been able to cool any substance upto its absolute zero temperature. A temperature close to the absolute zero temperature is attained but it never exactly reaches the absolute temperature.
For the conversion from celsius scale to kelvin or from kelvin to celsius scale, it is universally taken to be 0 K= -273°C.
Gas can never be zero volume because gas is a matter and certain composition and thus has its own volume.
In Kelvin scale, k is used whereas in celsius scale, degree (°) is used.
Cryosphere refers to the study of the materials and their characteristics at a relatively very low temperature.
Thus, the correct answers are option (2), (4) and (5).
Calculate the number of molecules present in 2.25 mol H2SO4. 2.25 x 1023 molecules 1.35 x 1024 molecules 3.53 x 1023 molecules
Answer:1.35 x 10^24
Explanation:
No. of molecules= mole x avogadro's constant
2.25 x 6.02 x 10^23
=1.35 x 10^23
Answer: The number of molecules in given amount of sulfuric acid is [tex]1.35\times 10^{24}[/tex]
Explanation:
According to the mole concept:
1 mole of a compound contains [tex]6.022\times 10^{23}[/tex] number of molecules.
We are given:
Moles of sulfuric acid = 2.25 mole
So, the number of molecules that will be present in 2.25 moles of sulfuric acid will be [tex]2.25\times 6.022\times 10^{23}=1.35\times 10^{24}[/tex] number of atoms.
Hence, the number of molecules in given amount of sulfuric acid is [tex]1.35\times 10^{24}[/tex]
WHAT IS RAIN-WATER HARVESTING?
Answer:
Explanation:
Rainwater harvesting is the accumulation and storage of rainwater for reuse on-site, rather than allowing it to run off. Rainwater can be collected from rivers or roofs, and in many places, the water collected is redirected to a deep pit (well, shaft, or borehole), a reservoir with percolation, or collected from dew or fog with nets or other tools. Its uses include water for gardens, livestock,[1] irrigation, domestic use with proper treatment, indoor heating for houses, etc. The harvested water can also be used as drinking water, longer-term storage, and for other purposes such as groundwater recharge.
Rainwater harvesting is one of the simplest and oldest methods of self-supply of water for households usually financed by the user.[2]
Answer:
Rainwater harvesting is discussed below.
Explanation:
Rainwater harvesting is assembling the run-off from construction or other impenetrable covering to save it for succeeding use. Traditionally, this comprises collecting the rainwater from a rooftop. The rainwater will accumulate in gutters that route the water into downspouts and then into some kind of accommodation container.A sample of an unknown volatile liquid was injected into a Dumas flask (mass of flask=
27.0928 g. Volume of the flask is 0.1040L) and heated until no visible traces of the
liquid could be found. The flask and its contents were then rapidly cooled and
reweighed (mass of flask + vapor = 27.4593 g). The atmospheric pressure and
temperature during the experiment were 0.976 atm and 18.0°C, respectively. The
unknown volatile liquid was_ (make sure you use the proper name for this
organic compound)
The unknown volatile liquid in your Dumas flask is most likely water due to its molar mass of approximately 18 g/mol
Explanation:The identity of the unknown volatile liquid in your Dumas flask can be determined using the ideal gas law equation PV=nRT, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in kelvins. By rearranging this equation to n=m/M, we can find the molar mass (M). With your provided figures (change in mass = 27.4593 g - 27.0928 g, V=0.104L, P=0.976 atm, T=18°C + 273=291K), we find M=~18 g/mol. This molar mass is most closely correlated to the organic compound known as Water (H2O).
Learn more about Dumas Method here:https://brainly.com/question/32273463
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