Answer: they giving you some hard question
Explanation:
i dont know know what the answer is do you have any answer options
determine the empirical and molecular formulas of a compound that gives the following analysis in math percent: 24.27% C,4.07% H, and 71.65%CL. the molar mass is known to be 197.92g/mol.
Answer:
help me with this
Explanation:
Please help, it's a task in science and I'm really bad at this subject.
Answer:
1. solid
2. liquid
3. plasma
4. gas
Those are the four parts of matter.
Explanation:
I hope this helps.
In a graph, what effect would adding a catalyst have on D?
A. It would decrease.
B. It would increase.
C. It would stay the same.
D. You cannot tell from this graph.
Answer:
C. It would stay the same
Explanation:
PLATO answer
Me without you is like a nerd without braces, A shoe without laces, aSentenceWithoutSpaces.
Answer:
LOL
Explanation:
5 What does 2Na2O mean?
Answer:
2 Na2O means two molecules of Sodium oxide.
mark me please
C5H12 + O2 = CO2 + H2O
If 84.3 grams of C5H12 react according to the above equation and the % yield is 94% find the actual yield of grams of carbon dioxide
Answer: 241.6 grams of CO2
Explanation: you take 84.3 grams C5H12 and divide it by 72.15 grams of C5H12(which is the molar mass) you take that answer and calculate the mols of CO2 by multiplying the 1.168 you got before and multiply it by 5. You take the answer you get from that and multiply it by the molar mass of CO2 and get the theoretical yield and then you just plug it in. 94= (x/257.02)x100 and solve to find x which is the actual yield.
What is the mass of 48 ml of a liquid if its density is 1.25 g/ml?
Answer:
60 g
Explanation:
Mass = Density × Volume
Mass = 1.25 × 48
Mass = 60 g
I hope this helps!
Do you think genetic engineering is ethical? Explain why or why not.
Answer:
Yes
Explanation:
One of the top goals of genetic engineering is the improvement of health. Imagine a world without the threat of AIDS or cancer. Those working in the genetics field hope that manipulating the genes of humans will one day enable science to prevent people from contracting these potentially deadly diseases.
Hypothesis: What do you think will happen when you add more magnets to the set up?
Answer:
........................
Elements are solid liquid and gas substance that can be found on earth which statements best describes an element
Answer:
i guess
Explanation:
we will never know
1. The number density of conduction electrons in pure silicon at room temperature is about 11016m3. By doping with phosphorous, you desire to increase this number by a factor of 1 million(106). At room temperature, assume that the thermal energy is sufficient that all of the extraelectrons from the P doping enter the conduction band. What fraction of silicon atoms must youreplace with phosphorous atoms
This question is incomplete, the complete question is;
The number density of conduction electrons in pure silicon at room temperature is about 10¹⁶ m⁻³. By doping with phosphorous, you desire to increase this number by a factor of 1 million (10⁶). At room temperature, assume that the thermal energy is sufficient that all of the extra electrons from the P doping enter the conduction band. What fraction of silicon atoms must you replace with phosphorous atoms
Answer:
the fraction of silicon atoms we must replace with phosphorous atoms is 4( 10⁶ - 1 )
Explanation:
Given that;
the number density no = 10¹⁶ m⁻³
Required no = (10¹⁶ × 10⁶) = 10²² m⁻³
Each silicon atom has 4 valence electron,
Hence; Silicon density = 10¹⁶/4
now, if x = No of silicon atoms to be replaced with phosphorous, then;
(10¹⁶/4 - x)4 + 5x = 10²²
10¹⁶ - 4x + 5x = 10²²
10¹⁶ + x = 10²²
x = 10²² - 10¹⁶
Fraction of silicon atoms will be;
⇒ 10²² - 10¹⁶ / 10¹⁶/4
⇒ 4( 10²² - 10¹⁶ / 10¹⁶ )
⇒ 4( 10²²/10¹⁶ - 10¹⁶/10¹⁶ )
⇒ 4( 10⁶ - 1 )
Therefore, the fraction of silicon atoms we must replace with phosphorous atoms is 4( 10⁶ - 1 )
Which one of the following ionic solids would have the largest lattice energy?
CaBr2
CsI
CaCl2
NaCl
NaF
Answer:
CaCl2
Explanation:
The ionic solid CaCl₂ would have the largest lattice energy. Therefore, option (c) is correct.
What is the lattice energy?Lattice energy is the heat of formation when one mole of crystalline ionic solid is generated from its constituent ions in their gaseous state.
For example, the lattice energy of sodium chloride crystal is the energy change of reaction when Na⁺ and Cl⁻ ions react to produce a NaCl crystal, which is equal to -786 kJ/mol.
The relation between lattice energy and lattice enthalpy at constant pressure is given by:
ΔU (lattice) = ΔH (lattice) - PΔV
Lattice energy is directly proportional to the charge on ions and inversely proportional to the interionic distance between ions.
For NaCl and NaF the charge on the ions is +1 and -1 while the size of the ions is small. So they have less lattice energy.
CsI ionic solid have a larger size of ions Cs⁺ and I⁻. So CsI will have less lattice energy. CsBr₂ has +2 charge on calcium but the size of both ios is larger. So, CsBr₂ will have less lattice energy.
CaCl₂ has + 2 charge on calcium as well as the ionic radius is also samll. Therefore, CaCl₂ would have the largest lattice energy.
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A bone contains 6.25% of Carbon -14 it began with. How old is the bone ?
Answer:
Is there a multiple choice??
Explanation:
Jewelry and tableware are sometimes made of sterling silver. Sterling silver is 92.5% silver (Ag) and 7.5% copper (Cu). If you wanted to make 30 grams of sterling silver for a ring, how many grams of silver and copper would you need to start with?
Amount of sterling silver?
Amount of copper?
total grams of alloys needed?
Answer:
12.33
Explanation:
92.5/7.5= 12.33
30g of the sterling silver ring contains, 27.75 g of silver and 2.25 g of copper.
What is cross multiplication?Cross multiply fractions by multiplying one fraction's denominator by the other fraction's numerator and then comparing the two values. The larger fraction is the one with the higher value.
100g of sterling silver contains 92.5g of silver and 7.5g of copper.percentage of element = amount of the element present in 100 g of materialTherefore,
100g sterling silver = 92.5g silver30g sterling silver = X g silver( cross multiplication),
100 × X = 92.5 × 30
X = 92.5 × 30/ 100
X= 27.75g silver100g sterling silver = 7.5g copper
30g sterling silver= Y g copper
(cross multiply)
100 × Y = 7.5 × 30
Y= 7.5 × 30 / 100
Y= 2.25g copperX (silver)= 27.75 g in 30 g of sterling silverY (copper)= 2.25 g in 30 g of sterling silvertherefore, 30g of sterling silver ring contains, 27.75 g of silver and 2.25 g of copper.
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What property of water is primary for living organisms? (SC.6.E.7.4) *
It is odorless.
It does not conduct electricity.
It is tasteless
It is liquid at most temperatures on Earth.
*20 points* I wil mark brainliest
Answer:
It is liquid at most temperatures on Earth.
An atom of carbon contains 6 total electrons. How many of these electrons are in s orbitals?
1
2
4
6
Answer:
4
Explanation:
total electrons = 6
electronic configuration = 1s^2, 2s^2, 2p^6
so in s orbital there are 4 electrons.
Hope it helps you (｡◕‿◕｡)
onsider a tank used in certain hydrodynamic experiments. After one experiment the tank contains 200 L of a dye solution with a concentration of 1 g/L. To prepare for the next experiment, the tank is to be rinsed with fresh water flowing in at a rate of 2 L/min, the well-stirred solution flowing out at the same rate. Find the time that will elapse before the concentration of dye in the tank reaches 1% of its original value.
Answer:
Explanation:
From the given information;
Let Q(t) = mass of dye in the tank as a function of time
The mass in the tank = 200 L × (1g/L) = 200 g
Using the law of mass conservation;
[tex]\dfrac{dQ}{dt} = \text{(Rate of incoming mass)- (rate of outgoing mass)}[/tex]
[tex]\dfrac{dQ}{dt} = (2 L/min ) (0 \ g/L) - (2 L/min ) (\dfrac{Q}{200}g/L)[/tex]
[tex]Q' = \dfrac{-Q}{1000}[/tex]
Q(0) = 200
By finding the solution to the ODE using the method of separation of variables;
[tex]\dfrac{Q'}{Q} = -0.01[/tex]
[tex]Q(t) = Ce^{-0.01t}[/tex]
Using the initial condition;
200 = Q(0) = C
[tex]Q(t) = 200e^{-0.01t}[/tex]
1% of 200g = 2g of dye solution
∴
[tex]2 = 200e^{-0.01t}[/tex]
[tex]e^{-0.01t}=0.01[/tex]
[tex]t =\dfrac{ In(0.01}{-0.01}[/tex]
t = 460.5 hours
WILL GIVE BRAINLIEST!!!
Use this media to help you complete the question.
There are three known forms of hydrogen. These forms are called (isotopes, ions, copies) of each other. Each of these forms will have the same number of (neutrons, protons, electrons) but different numbers of (neutrons, protons, electrons) in their nuclei.
Answer:
Isotopes, protons, netrons
Explanation:
Answer:
There are three known forms of hydrogen. These forms are called Isotopes of each other. Each of these forms will have the same number of protons but different numbers of neutrons in their nuclei.
Explanation:
The energy associated with a current is called____________
(A) mechanical energy
(B) magnetism
(C) geothermal energy
(D) electrical energy
Answer:
D. Electrical energy
Explanation:
I assume you are talking about an electrical current.
(These are by what I know and are simplified, not an exact definition)
A. Mechanical energy is energy that something has because of motion.
B. Magnetism is the attracting and repulsing forces between magnets.
C. Geothermal energy is heat inside of the Earth. Used as source of power.
D. Electrical energy is the result of an electric charge.
Oxygen gas, generated by the reaction 2KClO3 (s) 2KCl(s) 3O2 (g) is collected over water at 27°C in a 1.35-L vessel at a total pressure of 1.00 atm. (The vapor pressure of H2O at 27°C is 26.0 torr.) How many moles of KClO3 were consumed in the reaction?
Answer:
[tex]n_{KClO_3}=0.0353molKClO_3[/tex]
Explanation:
Hello!
In this case, according to the experiment, we first realize that the pressure of oxygen is:
[tex]p_{O_2}=1.00atm-26.0/760 atm=0.966atm[/tex]
Next, we compute the moles based off the ideal gas law:
[tex]PV=nRT\\\\n=\frac{PV}{RT}=\frac{0.966atm*1.35L}{0.08206\frac{atm*L}{mol*K}*300K}=0.0530molO_2[/tex]
Thus, since there is 3:2 mole ratio between oxygen and potassium chlorate, we can compute the consumed moles of the latter as shown below:
[tex]n_{KClO_3}=0.0530molO_2*\frac{2molKClO_3}{3molO_2} \\\\n_{KClO_3}=0.0353molKClO_3[/tex]
Best regards!
Write the formula of the conjugate base of the Brønsted-Lowry acic, HF
Answer:
Furthermore, because hydrofluoric acid, HF, loses a proton, H+1, to generate its conjugate in the reaction that is shown above, this reactant can be classified as a Brønsted-Lowry acid, and, consequently, the fluoride ion, F–1, is the conjugate base of this acid.
Explanation:
hope this helps
The formula of the conjugate base of the Bronsted-Lowry acid, HF is represented as F⁻.
What is the Bronsted-Lowry concept?The Bronsted-Lowry theory can be described as an acid-base reaction where acid and base react with each other and by an exchange of proton acid, produces its conjugate base and the base creates its conjugate acid.
The Bronsted-Lowry concept is actually an extended version of Arrhenius's theory of acid base. According to the Bronsted-Lowry concept, acid is a substance that donates a hydrogen ion or a proton and forms its conjugate base and the base is a substance that accepts proton and produces its conjugate acid.
Bronsted-Lowry acid can be represented as:
Acid ⇄ Conjugate base + H⁺
The conjugate base of Bronsted-Lowry acid HF can be represented as follows:
HF ⇄ F⁻ + H⁺
Therefore, fluoride ion F⁻ is the conjugate base of the Bronsted-Lowry acid HF.
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Pls help I’ll mark brainliest pls pls pls
Answer:
the tea was not hot sugar dissolves quickly and hot water than cold
Buffers are substances that help resist shifts in pH by Question 10 options: 1) releasing H in acidic solutions. 2) donating H to a solution when they have been depleted. 3) releasing OH- in basic solutions. 4) accepting H when the are in excess. 5) donating H to a solution when they have been depleted and accepting H when the are in excess.
Answer:
5) donating H to a solution when they have been depleted and accepting H when they are in excess.
Explanation:
A buffer solution is a solution that undergoes a negligible change in pH in addition of moderate quantities of acid or alkali. In other words, a buffer solution is one that resists a change in pH on addition or dilution of small amounts of acids or alkalis.
So, from the given question:
Buffers are substances that help resist shifts in pH by donating H to a solution when they have been depleted and accepting H when they are in excess.
An artificial reef is intended to affect the ocean ecosystem by — А A removing pollution from the water B В providing shelter for marine organisms causing sediment to erode into deeper waters D preventing people from overfishing along the shore
Answer:
B
Explanation:
just answered
An artificial reef is intended to affect the ocean ecosystem by providing shelter and habitat for marine organisms causing sediment to erode into deeper waters. Hence, option C is correct.
What is artificial reef ?An artificial reef is a human-made underwater structure, typically constructed with the purpose of enhancing marine biodiversity, providing habitat for marine organisms, and promoting recreational activities like fishing, diving, and snorkeling.
Artificial reefs can be created from a variety of materials, such as concrete, metal, tires, and sunken ships. The reef structure can also increase the overall biodiversity of an area by creating a new habitat for species that may not have been present before.
Additionally, the presence of an artificial reef can help to reduce pressure on natural reefs by providing an alternative location for fishing and other activities. However, artificial reefs are not typically used as a means of removing pollution from the water or preventing erosion.
Therefore, option C is correct.
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Psychology **
Richard often has hallucinations of his father who has passed away and has delusions that he is under constant government surveillance. What
is Richard likely to be suffering from?
A anxiety disorder
OB. personality disorder
OC, mood disorders
OD
schizophrenia
Answer:
D
Explanation:
pls help
Plot the point (5,9)
Which periodic table has the elements placed in locations that match the information on the flash card?
Answer:
https://quizizz.com/admin/quiz/5902a3fd8d05b2100088880a/cat-1-chemistry-review
Explanation:
Answer:
atomic? hope this helps!
Explanation:
Which statement describes steps involved in the production of hydroelectric power?
A. Falling water turns a turbine that helps generate electricity.
B. Moving water turns a paddle wheel that helps generate electricity.
C. Water falls down a pipe to generate electricity.
D. Potential energy of water is directly transformed into electrical energy.
Equation for questions 1-4:
4A1+302 → 2A1203
How many moles of oxygen are needed to react with 7.5 moles of aluminum
Answer:
5.625 moles of oxygen, O₂.
Explanation:
The balanced equation for the reaction is given below:
4Al + 3O₂ —> 2Al₂O₃
From the balanced equation above,
4 moles of Al reacted with 3 moles of O₂.
Finally, we shall determine the number of mole of O₂ required to react with 7.5 moles of aluminum, Al. This can be obtained as illustrated below:
From the balanced equation above,
4 moles of Al reacted with 3 moles of O₂.
Therefore, 7.5 moles of Al will react with = (7.5 × 3)/4 = 5.625 moles of O₂.
Thus, 5.625 moles of O₂ is needed for the reaction.
Specify the number of possible isomers of bromodimethylbenzene. 6 Write the name of one of these isomers. Abbreviate ortho (o), meta (m) and para (p), no italics, if you elect to use these terms.fill in the blank 2 Specify the number of possible isomers of aromatic compounds with the formula C7H8O. ___ Write the name of one of these isomers. Abbreviate ortho (o), meta (m) and para (p), no italics, if you elect to use these terms. fill in the blank 4
Answer:
Explanation:
See attached file .
The number of possible isomers of Bromodimethylbenze are 6. One of the isomers is 2 Bromo - m -xylene. The number of possible isomers of an aromatic compound [tex]\rm C_7H_8O[/tex] are 5. One of these isomers has been o - cresol.
(a). Bromodimethylbenze has also been known as bromoxylene. The compound has been consisted of 1 benzene ring with 2 methyl groups and a bromine atom.
The possible isomers of bromoxylene are:
4 Bromo - o -xylene3 Bromo - o -xylene2 Bromo - m -xylene4 Bromo - m -xylene5 Bromo - m -xylene2 Bromo - p -xylene(b). Aromatic compound with formula [tex]\rm C_7H_8O[/tex] has been the benzene compound. The compound has been consisted of a benzene ring with 1 methyl group and oxygen atom.
The possible isomers of [tex]\rm C_7H_8O[/tex] are:
Benzyl alcoholAnisolo - cresolp - cresolm - cresolThus, the number of possible isomers of Bromodimethylbenze are 6. One of the isomers is 2 Bromo - m -xylene. The number of possible isomers of an aromatic compound [tex]\rm C_7H_8O[/tex] are 5. One of these isomers has been o - cresol.
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