Answer:
Reverse Osmosis
Explanation:
Reverse osmosis systems are able to remove more contaminants than carbon, making them a popular choice for many consumers.
NEED HELP ASAP!
What is the frequency of a wave that has a wavelength of 28m? Remember that c = 2.998 x 10^8 m/s
A.) 10 Hz
B.) 1.07 x 10^7 Hz
C.) 10.7 Hz
D.) 2.3 x 10^7 Hz
Answer:
Frequency = Speed/wavelength
Frequency = 2.998 x 10^8 m/s ÷ 28m
Frequency = 1.07 x 10^7 Hz
Fe2O3 (s) + 3CO (g) -----> 2Fe (l) + 3CO2 (g)
How many moles of Fe2O3 must react to produce 760 kg of Fe? (please tell me how you get the answer...)
The number of moles of Fe₂O₃ that must react to produce 760 kg of Fe are 20.503
What are moles?The mole is a SI unit of measurement that is used to calculate the quantity of any substance.
The reaction is [tex]\rm Fe_2O_3 (s) + 3CO (g) ----- > 2Fe (l) + 3CO_2[/tex]
The mass of Fe is given 760 kg
The molar mass of Fe is 55.9 g/mol
To calculate the number of moles
[tex]n = \dfrac{m}{M} \\\\n = \dfrac{760000}{55.9 g/mol} = 13,669[/tex]
Now, the ratio between Fe and O is 2 : 3
[tex]\dfrac{13,669}{2} \times 3 = 20,503.5[/tex]
convert it into kg = 20.503 mol
Thus, the moles are 20.503 mol
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a solution contains 2 moles of hydrochloric acid.the volume of the solution is 250 cm3
what is its concentration in mol/dm³
Answer:
1dm = 10cm
1dm3 = 10cm x 10cm x 10cm = 1000cm3
1L = 1000cm3
so 1litre = 1dm3
4 moles in 2 dm3
= 2 moles in 1dm3 = 2moles in 1L = 2M
1L = 1000cm
0.3 moles in 200cm3 =
200cm3 = 0.2L
so 0.3 moles in 0.2 L = 1.5 moles in 1 L = 1.5M
(I have tried to simplify and show why 1dm3 = 1L)
I hope this helps you understand!
Give a brief description of the symptoms associated with dissociative fugue.
Answer:
People may seem and act normally during the fugue, or they may appear moderately bewildered and draw no notice. When the fugue is over, however, people are thrown into a new scenario with no recall of how they got there or what they were doing.
Explanation:
Question progr
when the reactants have less enthalpy than the products, then
a. none of these
ob. the reaction will be complete
c. heat energy is given out
d. heat energy is absorbed
(pls help!) What mass of oxygen atoms is required to react completely with 30 u of hydrogen atoms?
One mole Hydrogen need 1/2mol O_2 .
Moles of Hydrogen
30u/1u30molMoles of O_2
30/215mol[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
Let's get to the reaction first ~
[tex] \qquad \qquad \rm 2H_2 + O_2 \rightarrow 2H_2O[/tex]
Here, we can infer that if we need 1 mole oxygen gas to react with 2 moles Hydrogen gas.
So, the number of Oxygen gas molecules we need to react should be half the number of Hydrogen gas molecules.
Number of Hydrogen gas molecules is :
[tex]\qquad \sf \dashrightarrow \: \dfrac{30}{2} [/tex]
[tex]\qquad \sf \dashrightarrow \: 15[/tex]
Number of Oxygen gas molecules needed is :
[tex]\qquad \sf \dashrightarrow \: \dfrac{15}{2} [/tex]
Number of Oxygen atoms needed :
[tex]\qquad \sf \dashrightarrow \: \dfrac{15}{2} \times 2[/tex]
[tex]\qquad \sf \dashrightarrow \: {15} \: atoms[/tex]
One atom of Oxygen weight 16 u, so 15 atoms weight ~
[tex]\qquad \sf \dashrightarrow \: {15} \times 16[/tex]
[tex]\qquad \sf \dashrightarrow \: 240 \: u[/tex]
So, we need 240 u of Oxygen atoms to react completely with 30 u of Hydrogen atoms.
Fill in the blank with the correct response.
————— surveys are measurement tools that use a series of questions to obtain data from respondents.
Surveys are the data collection tool and research methods. The questionnaire survey tool is used to collect the data based on questions.
What are questionnaires?Questionnaires are the tool used for the research and the data collection for the analysis, investigation, and conclusion. It is one of the data collection tools that comprises questions and prompts.
Questionnaires are the part of surveys that gathers information on the topic of the research and is easy to analyze and cost-effective. It is a valuable tool that collects data from a large number of participants.
Therefore, the correct blank is the questionnaire.
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15.a. Classify the following alkanes according to their increasing density. C₂Hs , C2H56, C11H24, C₂H6. C36H74
The order of alkanes according to their increasing density can be seen below:
C₂H5C₂H6C2H56C11H24C36H74What is Alkane?This is referred to a hydrocarbon with a single carbon to carbon bond and examples include butane etc.
Its density increases with increasing number of carbon and hydrogen atoms thereby making it the most appropriate choice.
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Do you like the eye color black or blue better?
Answer:
black.
Explanation:
I like seeing myslef, so therefore with black eyes I would be seeing my reflection
A scientist finds a fossil that she thinks might make a good index fossil.
Which characteristic does this fossil most likely have?
Answer: A fossil will usually have remains or impressions of an animal or plant.
Answer:
the answer is b
Explanation:
trust me
A canister has a fixed volume. If the pressure of the cannister is 1.5 atm at 25 Celsius, what is the new pressure if the temperature rises to 75 degrees Celsius?
a) 4.5 atm
b) 1.6 atm
c) 1.3 atm
d) 1.8 atm
Answer:
d) 1.8 atm
Explanation:
According to Boyle's Law,
P₁/T₁ = P₂/T₂Here, we are given :
P₁ = 1.5 atmT₁ = 25°C = 298 KT₂ = 75°C = 348 KSolving
P₂ = P₁T₂/T₁P₂ = 1.5 x 348 / 298P₂ = 522/298P₂ = 1.8 atm (approximately)acrostic poem for selective breeding
Answer:
Selective Breeding
Weeds are bad,
But why is this so?
Just like grass,
They too grow.
Weeds are disliked,
Like the drink that's spiked.
But why is this so?
Who's to say they shouldn't grow?
The weed is unwanted,
Like a murderer hunted.
But what crime did it commit?
Why should it not, be free to sit?
Thickly they may grow,
But grass even more so.
Who's to say they should not grow?
Why should their seed not be sow?
Weeds are bad,
But why is this so?
Just like grass,
They too grow.
If all things living, were for cared,
The land we own, for all shared.
The weed let live,
And life not carefully selected by- siv.
Selective breeding is unfair,
No better than plain warfare...
Explanation:
(Help!) What is the mass of hydrogen atoms that is measured at 72 u?
Answer:
=71.439911 u
Explanation:
We know that 1 mass of hydrogen atom = 1.00784 u
If it's measured at 72u: 72/1.00784=71.439911 u
Mass of 1 mol hydrogen atoms =1.00784u
Total mass in 72u
72/1.0078471.43ulet's say these four solutions have the same concentration, which one has the highest freezing point?
Answer:
What are those for solution be specific
Convert 65 grams of oxygen to moles
65 grams of oxygen is approximately equal to 2.03125 moles.
To convert 65 grams of oxygen to moles, we need to use the molar mass of oxygen (O₂), which is approximately 32.00 g/mol. Oxygen exists as a diatomic molecule (O₂), so we use the molar mass of O₂ to convert from grams to moles.
The formula for converting grams to moles is:
Moles = Mass (in grams) / Molar mass (in grams per mole)
Given:
Mass of oxygen = 65 grams
Molar mass of oxygen (O₂) = 32.00 g/mol
Moles of oxygen = 65 grams / 32.00 g/mol
Moles of oxygen ≈ 2.03125 moles
Therefore, 65 grams of oxygen is approximately equal to 2.03125 moles.
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What is the role of an Antibody?
Antibodies are part of the human immune system. Basically, they identify bad bacteria and viruses and track them down to fight back.
One of the examples of homologous series is given below:
CH3OH
CH3CH2OH
X
CH3CH2CH2CH2OH
i. Define homologous series,
ii. Find the mass difference between successive members of above homologous series and calculate the molecular mass of x.
iii What is the reason behind the highest boiling point bu least solubility of the fourth member in the given series?
Homologous series: Homologous series is the series in which the functional group of any compound and their chemical properties are similar, the difference between any two successive members is same.
Above homologous series is of Alkanol
[tex] \tiny\sf \: general \: formula \: for \: Alkanol \rightarrow C_nH_{2n+2}O[/tex]
Above homologous series is differed by methylene (-CH2-) group. hence the mass diffrence between them would be the mass of -CH2- group.
[tex] \small \sf \: CH_2 = = 12+1+1 = 14 \: a.m.u. \\ \hline[/tex]
The compound X is next to CH3CH2OH hence, X will have molecular formula CH3CH2CH2OH which is obtained by addition of a methylene group.
[tex]\tiny\: the \: compound \: x \: (n = 3) \: have \: general formula =C_3H_{8}O \\ \small \sf \: The \: molecular \: mass \: of \: X =3 \times 12 + 8 \times 1 + 16 \\ \sf = 60 \: a.m.u[/tex]
The reason behind the highest boiling point of butanol is his molecular mass, the main reason is the surface area, as the molecular mass increases surface area also increases which lead to increase in the vanderwall forces, due to which boiling point of compound increases. the same compound having least solubility is due to lyophilic/Hydrophobic ( tendency to get dissolved in non aqueous solution) increases & solubility of compound in polar solvents decreases.
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Terbium-147 undergoes positron emission to become a stable atom. what is that stable atom? a. b. c. d. e. f.
Terbium-147 undergoes positron emission to become a stable atom, the stable atom is ₆₄Gd¹⁴⁷.
What are radioactive decay series?Series (or family) of natural radioactive decay is the set of elements with unstable nuclei, which follow an orderly sequence of spontaneous decay, that is, they emit alpha and beta particles, until a stable lead nucleus is created.
In this case, natural radioactive decay occurs when the nucleus of the atom of some chemical element is unstable and then it "breaks", releasing electromagnetic radiation and disintegrating.
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1 start with 25°C and a volume of 10.0L. If I increase the volume to 15.0L, what is my new temperature? (Equation that is helpful: K= 273 + "C)
Answer:
If in volume of 10.0L it is 25°C than it will be 37.5C volume in the new temperature if increased from 10.0L to 15.0L
Explanation:
10.0L=25°C
15.0L=?
10×2.5= 25
15×2.5=37.5
Kelvin(K)= C+273=T
=37.5+275=312.5
=C=312.5-275
=C=37.5
Sally fell off of her bike and scraped her knee. What cellular process would aid in the healing of her scrape? Group of answer choices meiosis mitosis
Answer:
Mitosis
Explanation:
you scrape your knee and the skin repairs itself
Which of the following statements supports the idea that light behaves as a wave?
A.
Photons change direction when they interact with electrons.
B.
Light bends as it passes from one medium to another.
C.
The kinetic energy of an electron increases when light of high frequency is incident on it.
D.
There are gaps in the absorption spectrum as light is absorbed at certain frequencies.
Answer:
It's B
Explanation:
as I answered it in study island.
In relation to us, galaxies are doing what?
Answer:
Moving away from us
Explanation:
I believe this is the answer. Sorry if it's incorrect, I'm not very good in this subject.
Ne double-replacement reaction of iron(ii) nitrate with potassium
ydroxide produces a precipitate of iron(iii) hydroxide.
fe(no3)3(aq) +3koh(aq) +3kno3(aq) + fe(oh)3(s)
that mass of iron(iii) hydroxide is produced when 50.0 g iron(iii)
itrate reacts with excess potassium hydroxide?
a 7.36 g fe(oh)3
w
b 22.1 g fe(oh)3
g
3
c 66.3 g fe(oh)3
d 50.0 g fe(oh)3
check it
skip
The mass of iron (III) oxide that will be produced would be 22.1 grams
Stoichiometric calculationFrom the equation of the reaction:
[tex]3KOH + Fe(NO_3)_3 --- > 3KNO_3 + Fe(OH)_3[/tex]
The mole ratio of iron (III) nitrate to iron (III) hydroxide is 1:1.
Mole of 50 g iron (III) nitrate = 50/241.86 = 0.207 moles
Equivalent mole of iron (III) hydroxide = 0.207 moles
Mass of 0.207 moles iron (III) hydroxide = 0.207 x 106.87 = 22.1 grams
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Identify the molecular shape of each lewis structure. bent tetrahedral trigonal planar trigonal pyramidal
Identify the molecular shape of each lewis structure we have that:
1. Trigonal pyramidal
2. Tetrahedral
3. Trigonal planar
4. Bent
What is Lewis structure?For an understanding through pictures of the location of electrons in an atom, we represent electrons as dots around the element symbol. The number of electrons available for bonding is indicated by unpaired dots. These symbols are called Lewis symbols.
The Lewis structure shows the formation of bonds in a molecule, as well as the atoms involved and the valence electrons of each of them, in this case was Trigonal pyramidal; Tetrahedral; Trigonal planar; Bent.
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Which products are formed when propane (C3Hg) undergoes combustion?
O A. Water and carbon
OB. Water and carbon dioxide
OC. Hydrogen and carbon dioxide
OD. Water, carbon dioxide, and oxygen
Answer:
Water and carbon dioxide
Explanation:
The product of combustion for all hydrocarbons are carbon dioxide and water
what is the volume of 15.0 g of ice
A. 7.5
B. 13.8
C. 15.0
D. 16.3
When we convert 15 g of ice to volume in milliliters (mL), the result obtained is 15 mL (option C)
Conversion scale1 g = 1 mL
How to convert 15 g to mL1 g is equivalent to 1 mL.
Therefore,
15 g will also be equivalent to 15 mL
Thus,
15 g = 15 mL
The correct answer to the question is 15 (Option C)
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please explain this question
this is urgent thank u
Answer:
the answer is C which says 1 and 2
How much carbon dioxide do the people of earth add to the atmosphere in one year?.
Answer: About 43 billion tons
Explanation:
This is gonna be quite hard to explain.
Which of the following is the best hypothesis?
OA. Physical changes are much less interesting to watch than
chemical changes.
B. If sodium carbonate is added to vinegar, the reaction will absorb
heat.
C. Tearing a piece of paper is an example of a physical change.
D. Some chemical reactions absorb heat, and others release heat.
SUBMIT
Help me y’all
Answer:
B.) If sodium carbonate is added to vinegar, the reaction will absorb heat.
Explanation:
A.) is incorrect because this is not testable. Rather, it is just an opinion that cannot be proven correct or incorrect.
B.) is correct because this statement is testable. Tests need to be run to determine the accuracy of the statement.
C.) is incorrect because this statement explains something that does not need to be tested. It is an example of a physical change when one tears a piece of paper.
D.) is incorrect because this is already a true statement. It is obvious that not all reactions absorb/release heat. While tests could be run to further prove this statement true, it is already considered accurate.
Energy can come in many different forms such as mechanical energy, sound energy, electromagnetic energy, thermal energy, chemical energy, and nuclear energy.
15 Energy is measured in units called __________
Answer:
Explanation:
Energy can come in many different forms such as mechanical energy, sound energy, electromagnetic energy, thermal energy, chemical energy, and nuclear energy.
15 Energy is measured in units called __________
