Answer:
C. A technological society has both a positive and negative impact on the environment
Explanation:
It is correct to suggest and to acclaim that a technological society has both a positive and negative impact on the environment.
The environment is the region of space where living organisms and non-living components can be found.
Technology no doubt has opened up our knowledge about the environment. We are now aware of very topical issues that affects the environment and how to combat them. On the other side, technological advance has also bode poorly for the environment. New chemical wastes generated by industrial processes have proven very costly to the environment.We see that technology has both negative and positive effects on the environment.
determine the vapor pressure in atm of water in an aqueous solution of 12% BY MASS EHTYLEENE GLYCOL (ANITFREEZE) IF THE VAPOR PRESSURE OF
The given question is incomplete, the complete question is:
Determine the vapor pressure (in atm) of water in an aqueous solution of 12% by mass ethylene glycol (antifreeze) if the vapor pressure of pure water at that temperature is 0.095 atmospheres.
Answer:
The correct answer is 0.091 atm.
Explanation:
Based on the given information, the mass of ethylene glycol is 12% by mass, which means 12 grams of ethylene glycol dissolved in 88 grams of water.
The moles of a substance can be determined by using the formula,
Moles = Weight/molecular mass
Number of moles of water = mass/molecular mass
= 88g/18g/mol
= 4.88 moles
Number of moles of ethylene glycol = Mass/molecular mass
= 12 grams/62g/mol
= 0.193 moles
Mole fraction of water will be,
Mole fraction = number of moles of water/Number of moles of water+Number of moles of ethylene glycol
Mole fraction = 4.88/4.88+0.193
= 0.961
Vapor pressure of water can be determined by using the formula,
Vapor pressure = Vapor pressure of pure water * Mole fraction of water
= 0.095 * 0.961
= 0.091 atm.
UV-B light is harmful to the human body and can cause irreparable cell damage. How much energy per photon is associated with UV-B rays with a wavelength of 305 nm?
The energy of the waves is 6.5 * 10^-19 J.
What is the energy?The energy of the wave could be obtained from the wavelength of the wave by by the use of the formula shown below;
E = hc/λ
h = Plank's constant
c = speed of light
λ = wavelength
Now we have;
h = 6.6 * 10^-34 Js
c = 3 * 10^8 m/s
λ = 305 * 10^-9
E = 6.6 * 10^-34 Js * 3 * 10^8 m/s/ 305 * 10^-9
E = 6.5 * 10^-19 J
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Treatment of 2-amino-2-methylcyclohexanone with methyl 2,4-dibromobutanoate in the presence of a nonnucleophilic base, , involves two successive SN2 reactions and gives compound A. Propose a structural formula for compound A.
Answer:
Explanation:
The proposed structural formula for compound A can be seen in the diagram below with its reaction mechanism. In the first SN2 reaction, we could see how anime reacts with the primary alkyl bromide since it is more reactive. However, the product derived undergoes a subsequent SN2 reaction in the second stage to produce a cyclic product.
how many moles are in 47.5 g of Ca?
A.2.85 e 25
B.1.18 mol
C. 7.89 e-23
D.1900 mol
What would you expect the balance to read when the reaction has finished? Circle the correct answer.
179 g , 180 g , 181 g
Answer all of the questions pllllzzz
Answer:
180 g
Explanation:
At the end of the reaction, the mass is still expected to be 180g this is because in every chemical reaction, mass must be conserved.
According to the law of conservation of mass "in a chemical reaction, matter is neither created nor destroyed".
Bonds are broken and elements rearranged. The mass is thereby constantThe sum of the mass of the reactant is then even equal to the mass of the product derived.HELP HELP
There is only one type of receptor to sense stimuli
true or false?
they deserve a brainliest :)
Draw a structural formula of an alkene or alkenes (if more than one) that undergo acid-catalyzed hydration and without rearrangement give 1-methylcyclohexanol as the MAJOR product. Ignore stereochemistry. If your answer includes more than one alkene, just draw both structures. Do not separate the formulas with + or any other sign.
Answer:
See explanation and image attached
Explanation:
The acid-catalyzed hydration of alkenes is an ionic reaction. Being an ionic reaction, a carbocation is formed in the process. This carbocation is capable of rearrangement to yield different products based on thermodynamic stability.
Remember that the order of stability of carbocations is; methyl< primary<secondary< tertiary. The rearrangement of carbocations leads to the formation of more stable intermediates and consequently more stable products.
However, the alkene in the image shown yields 1-methylcyclohexanol without carbocation rearrangement.
If two oxygen atoms bond covalently, the bond is
A) nonpolar ionic
B) nonpolar covalent
C) polar covalent
D) ionic
Answer:
probably b i got nothing but i hop eit is good
Explanation:
how is the mole of a used to express the mass of a substance explain
Answer:
See explanation
Explanation:
The mole refers to the amount of substance contained in 12 g of carbon-12. It was arbitrarily related to the number of elementary entities in 12 g of carbon -12 by Prof. Avogadro.
The number of moles of a substance is obtained as the mass of the substance divided by the mass of one mole of the substance (molar mass). Hence when the number of moles is known, the mass is now;
number of moles * molar mass
How many particles are in 47.7 g of Magnesium? (Round the average
atomic mass to two numbers after the decimal)
Answer:
1.18 × 10²⁴ particles Mg
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
47.7 g Mg
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of Mg - 24.31 g/mol
Step 3: Convert
[tex]47.7 \ g \ Mg(\frac{1 \ mol \ Mg}{24.31 \ g \ Mg} )(\frac{6.022 \cdot 10^{23} \ particles \ Mg}{1 \ mol \ Mg} )[/tex] = 1.18161 × 10²⁴ particles Mg
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
1.18161 × 10²⁴ particles Mg ≈ 1.18 × 10²⁴ particles Mg
what makes up from zero to four percent of the atmosphere?
I don't understand
Answer:
A 9 moles of reactants changes into 11 moles of product
Explanation:
Which of Earth’s spheres contains rocks and sediments?
Answer:
Geosphere
Explanation:
Geosphere sometimes called as lithosphere starts from the surface of the earth and lies till crust. This part of the earth contains rocks and minerals.
This portion of the earth includes sediments,mountains and rock. The natural resources that is available to the human brings lies in geosphere.
What is the energy of an X-ray with a frequency of 6.35 x 108 Hz?
Answer:
3x10 16hz 16 small above 10
Explanation:the frequency of any wave is (wave speed)/(wavelength)
The speed of light is 3x10 m/s. that's 30 million quartz
What is neutralization ?
Answer:
"a chemical reaction in which acid and a base react quantitatively with each other"
Explanation:
How many moles are there in 1.0 g of H2?
Answer:
4-5
Explanation:
maybe 5
Using the square-bracket notation, express the concentration of ions in a solution that is 0.811 M in aluminum sulfate [Al2(SO4)3].
[Al^3+] = ____ M
[SO4^2−] = ____ M
Answer:
[Al³⁺] = 1.62 M
[SO₄²⁻] = 2.43 M
Explanation:
Step 1: Given data
Molar concentration of Al₂(SO₄)₃: 0.811 M
Step 2: Write the reaction for the ionization of Al₂(SO₄)₃
Al₂(SO₄)₃(aq) ⇒ 2 Al³⁺(aq) + 3 SO₄²⁻(aq)
Step 3: Calculate the molar concentration of Al³⁺
The molar ratio of Al₂(SO₄)₃ to Al³⁺ is 1:2. The molarity of Al³⁺ is 2/1 × 0.811 M = 1.62 M.
Step 4: Calculate the molar concentration of SO₄²⁻
The molar ratio of Al₂(SO₄)₃ to SO₄²⁻ is 1:3. The molarity of SO₄²⁻ is 3/1 × 0.811 M = 2.43 M
The concentration of the aluminium ion is 0.4055 M while the concentration of the sulfate ion is 0.270 M.
We know that the following reaction occurs for the dissolution of Al2(SO4)3 in water;
Al2(SO4)3(s) ----> 2Al^3+(aq) + 3SO4^2-(aq)
To find the concentration of each of the ions;
Concentration of Al^3+ = 1/2 × 0.811 M = 0.4055 MSo using the square bracket notation to indicate concentration;
[Al^3+] = 0.4055 M
Concentration of SO4^2- = 1/3 × 0.811 M = 0.270 MSo using the square bracket notation to indicate concentration;
[SO4^2−] =0.270 M
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Which of the following aqueous solutions has the highest boiling point?
A) 0.10 M lithium sulfate, Li2SO4
B) 0.10 M hydrochloric acid, HCI
C) 0.10 M lithium nitrate, LINO3
D) 0.10 M magnesium sulfate, MgSO4
The highest boiling point : A) 0.10 M lithium sulfate, Li₂SO4
Further explanationSolutions from volatile substances have a higher boiling point and lower freezing points than the solvent
ΔTb = Tb solution - Tb solvent
ΔTb = boiling point elevation
[tex] \large {\boxed {\boxed {\bold {\Delta Tb \: = \: Kb.m}}} [/tex]
Kb = molal boiling point increase
m = molal solution
For electrolyte solutions there is a van't Hoff factor = i
i = 1 + (n-1) α
n = number of ions from the electrolyte
α = degree of ionization, strong electrolyte α = 1, for non electrolytes i = 1
So ΔTb ≈ i(van't Hoff), the greater i, the greater ΔTb
α = 1 , strong electrolyte
A) 0.10 M lithium sulfate, Li₂SO4
Li₂SO4 ⇒2Li⁺+SO₄²⁻ ⇒n=3
B) 0.10 M hydrochloric acid, HCI
HCl⇒H⁺+Cl⁻⇒n=2
C) 0.10 M lithium nitrate, LINO₃
LINO₃ ⇒ Li⁺+NO₃⁻ ⇒n=2
D) 0.10 M magnesium sulfate, MgSO4
MgSO4 ⇒ Mg²⁺ + SO₄²⁻ ⇒ n=2
Determine the mole ratio between oxygen and water for the following equation:
2 H2 + O2 - 2 H2O
A. 1:2
B. 1:1
C. 2:2
D. 2:1
Answer:2.2
Explanation:
please help. i’ve been gone for school for 1 week and half and i’m totally lost.
What happened when Crookes placed a solid object inside
the cathode ray tube?
a
The object cast a shadow on the other end of the
tube.
b The object exploded.
С
The cathode rays burned a small hole in the
object.
d The cathode ray tube stopped working.
What is the acceleration of a 50kg object pushed with a force of 500 Newton’s
Answer:
10 m/s²Explanation:
The acceleration of an object given it's mass and the force acting on it can be found by using the formula
[tex]a = \frac{f}{m} \\ [/tex]
f is the force
m is the mass
From the question we have
[tex]a = \frac{500}{50} = \frac{50}{5} = 10 \\ [/tex]
We have the final answer as
10 m/s²Hope this helps you
how many moles are there in 1578 grams of Ba3(C6H6O7)2
Answer:
Explanation:
The essential though process is to ask oneself when converting grams to moles=> 'How many formula weights are in the given mass?' This directs one to divide the substance's formula weight into the given mass (in grams) on order to determine number of moles. That is ...
moles = Given Mass of Substance in grams / formula weight of substance in grams
= 1578 grams / 791 grams-mol.⁻¹ =1.995 mole ≅ 2 moles
Question 3
What is the pH of a solution with [H 30 +) = 1 x 10 -9 M?
1.0 x 10 -5
-9.0
5.0
-5.0
9.0
Answer:
[tex] \huge 9[/tex]
Explanation:
The pH of a solution can be found by using the formula
[tex]pH = - log [ { H_3O}^{+}][/tex]
From the question we have
[tex]pH = - log(1 \times {10}^{ - 9} ) [/tex]
We have the final answer as
9Hope this helps you
A teacher makes the following statement.
“Gasoline boils at a relatively low temperature (about 150°C). The kerosene is removed at around 200°C, followed by diesel oil at 300°C and fuel oil at around 370°C.”
What topic is the teacher most likely talking about?
distillation of a mixture
filtration of a pure substance
evaporation of a mixture
sorting of a pure substance
Answer:
distillation of a mixture
Explanation:
Answer:
A.) Distillation of mixture.
Explanation:
edge 2021
(30 POINTS AND BRAINLIEST, THIS IS DIMENSIONAL ANALYSIS! PLEASE HELP & SHOW WORK!) (only right answers otherwise I WILL REPORT)
In a primitive barter society, the following rates of exchange exist: 1 fot = 5 vum, 2 sop = 3 tuz, 4 bef = 5 tuz, and 9 fot = 2 bef. A man has 4 sop and wants to convert all his possessions into vum. How many vum can he trade for?
The number of vum the man can trade for is = 108 vum
Calculation of the number of vumThe number of sop the man has = 4 sop.
But the exchange rates are as follows:
1 fot = 5 vum,
2 sop = 3 tuz,
4 bef = 5 tuz,
9 fot = 2 bef
Using,
2 sop = 3 tuz,
4sop = X tuz
X tuz = 4×3/2 = 13/2 = 6 tuz.
Using,
4 bef = 5 tuz,
X bef = 6 tuz
X bef = 6×4/5
X bef =24/5 = 4.8 bef
Using,
9 fot = 2 bef
X fot = 4.8 bef
X fot = 9 × 4.8/2
X fot = 21.6 fot.
Using,
1 fot = 5 vum,
21.6 fot = X vum
X vum = 5 × 21.6/1
X vum = 108 vum
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How many oxygen atoms are contained in 4.39 grams of Al2(SO4)3?
The average distance between two molecules is 6.55 x 10 19 pm. What is this distance in nanometers? Report your number in scientific notation and with the correct number of significant figures. For example 1000 would be reported as 1.00e+3 and 0.001 would be 1.00e-3.
So there are two aluminum atoms, three sulfur atoms, and 12 oxygen atoms in a single unit of the compound Al2(SO4)3.
What is aluminum?Chemical element aluminum has the atomic number 13 and the letter Al assigned to it. The density of aluminum is around one third that of steel, which is less than that of most common metals. When exposed to air, it generates an oxidized layer that protects the surface because to its strong affinity for oxygen. With regard to color and light-reflecting properties, aluminum has a striking visual similarity to silver. It has a soft, ductile, and non-magnetic texture.
Aluminum is the twelfth most frequent element in the universe and has only one stable isotope, 27Al, which is also quite abundant. Radiodating employs the radioactivity of 26Al.
Chemically, aluminum belongs to the boron group and is a post-transition metal.
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classify the following as a heterogeneous, homogeneous, or a pure substance:
Lemonade with no pulp
Answer:
pretty sure it's heterogeneous
Explanation:
Also, I saw you added me as a friend and I'm kinda curious as to why :)
Answer:
Heterogeneous mixture
Explanation:
How many dm in 14.5 mm?
What is the significance of temperature t
Answer:
send a pic or more info
Explanation: