Answer:
"How to prevent the collapse of the dam that contains water from heavy rains?"
Explanation:
Scientists must work to create innovations capable of bringing benefits to human life and combating disadvantageous and harmful situations. The overflow of dams is something very harmful, as the resulting flooding can cause structural, economic and even public health problems. When this overflow is caused by natural elements, such as heavy rains, the work of scientists in solving these issues is even more important and necessary. In order to resolve the dam failure caused by excess rainwater, scientists must work to answer the following question:
"How to prevent the collapse of the dam that contains water from heavy rains?"
Someone help me with this science question pls
Answer: Can i see the question
Explanation:
What is the balanced chemical reaction when Aluminium reacts with NaOH to produce NaAlO2 and H2 gas?
Answer:
2NaOH + 2Al +2H2O = 2NaAlO2 +3H
Explanation:
Aluminum is an amphoteric element it reacts with both bases and acids to form a salt and hydrogen gas.The reaction is highly exothermic.
Arrange the compounds in order of increasing entropy (S).
CH3OH(s)
CH3OH(l),
CH3OH(g),
CH3CH2OH(g)
CH3OH(s) > CH3OH (l) > CH3OH(g) > CH3CH2OH(g)
CH3OH(s) < CH3OH (l) < CH3OH(g) < CH3CH2OH(g)
Answer: The given compounds are arranged in order of increasing entropy (S) as [tex]CH_{3}OH(s) < CH_{3}OH(l) < CH_{3}CH_{2}OH < CH_{3}OH(g)[/tex]
Explanation:
The degree of randomness present in a substance is called entropy.
This means that more is the number of molecules weakly held together and rapidly moving from one place to another more will be its entropy.
In solids, the molecules are held together strongly with each other. So, they will have least entropy.
In liquids, the molecules are a little loosely held together. So, they have more entropy than a solid substance.
In gases, the molecules are held by weak forces due to which they move rapidly from one place to another. Hence, gases have high entropy as compared to solids and liquids.
Also, more is the molecular mass of a gas less will be its rate of effusion. Hence, less will be its entropy.
[tex]Rate of effusion \propto \frac{1}{\sqrt{M}}[/tex]
where,
M = molecular mass
Thus, we can conclude that given compounds are arranged in order of increasing entropy (S) as [tex]CH_{3}OH(s) < CH_{3}OH(l) < CH_{3}CH_{2}OH < CH_{3}OH(g)[/tex]
what is the oxidation state of p in po4 3
Answer:+5
Explanation: A P3X
(1) The solubility of Salt AB2(s) is 5mol/dm^3. (a) Obtain an expression for the solubility product of Salt AB2,in terms of s.
Answer:
See explanation
Explanation:
Let the equation of dissolution be;
AB2(s) ⇄A(aq) + 2S
Hence;
Ksp = [A] [2s]^2
Let the concentration of the species be s
Ksp= s × (2s)^2
Ksp= 4s^3
Since s= 5mol/dm^3
Ksp = 4(5mol/dm^3)^3
Ksp = 500 mol^2dm^-6
PLEASE HELP ME!
Aspartame is an artificial sweetener that is 160 times sweeter than table sugar. It is marketed as Pal-Sweet. The molecular formula of aspartame is C¹⁴H18N²O5.
i) Name the elements that made up aspartame. [2 marks]
(ii) Calculate the relative molecular mass of aspartame. [2 marks]
(iii) Calculate the number of moles in 7.35g aspartame. [3 marks]
(iv) Calculate the number of molecules in 5.88 g aspartame. [2 marks]
(v) Calculate the mass in grams of one molecule of aspartame. (H=1, C=12, N=14, 0=16, N = 6 x 10²³mole) [3 marks]
Answer:
A. Carbon, Hydrogen, Nitrogen, and Oxygen
B. 12(14) + 1(18) +12(2)+16(5)= 294.20g
C. 7.35/294.3=0.0250mol
D. 5.88g/294.3=0.01997961264 × 6.02 × 10^2= 12.028
Explanation:
Question 24 Multiple Choice Worth 2 points)
[BWS.02] Why is science important for society?
Answer:
Because the scientific knowledge itself helps solve many basic human needs and it also improves how humans live and their standards. For example, without science medications wouldn´t exist and many technological devices we use now-a-days. We´re surrounded by science, we just don´t really notice it.
PLEASE HELP ME!
-The compound dissolves in water to form a solution with pH > 7.
- The compound has a low boiling point.
The elements P, Q, R and S have proton number of 1, 7, 11 and 17.
Which of the following pair of elements will react to form a compound with the characteristics stated in the table above?
A. P and Q
B. R and S
C. Q and R
D. P and S
Answer:
C
Explanation:
Q and R forms a nitrate. When dissolved in water it will form a solution with a pH greater than 7 because the solution is alkaline.
Define the boiling and evaporation using kinetic theory
Answer:
Explanation:
By the kinetic molecular theory (particle model), all matter consists of particles, there are spaces between the particles, the particles are in constant random motion, and there are forces of attraction and repulsion between the particles.
Furthermore, temperature is defined to be a measure of the average kinetic energy of the particles.
Evaporation is a change of phase from liquid to gas explained as follows :
When particles in the liquid phase are heated, they gain kinetic energy and move faster and further apart. Eventually they have enough energy to escape the forces of attraction holding them together in the liquid phase and they move very fast and far from each other and exist in the gaseous phase.
URGENT!!!
Which of the following describes a property of water that helps sustain marine life forms? (5 points)
a. Open spaces in water's solid structure makes its solid state less dense than its liquid state.
b. Water contracts on cooling below 4 °C, lowering its density until it reaches 0 °C.
c. Water freezes from bottom to top, which allows it to form a solid layer of ice only at the bottom of rivers and lakes.
d. Water has a very low specific heat capacity, allowing it to heat up quickly.
Answer:
a.) open spaces in waters solid structure makes its solid state less dense than its liquid state.
Answer: It is a.) open spaces in waters solid structure makes its solid state less dense than its liquid state.
Explanation: This is because the solid state of water is less dense than its liquid state due to free spaces in its solid structure.
Bacteria, viruses, parasites, and mold are examples of which category of hazard-causing agents?
Answer:
abiotic infectious agent
Explanation:
not sure tho
Applicable in case of strong acid–
(i) gets completely ionized in aqueous solutions
(ii) gives H+ ion in aqueous solution
(iii) sour in taste
Which one is correct?
A
i, ii, iii
B
i, ii
C
ii, iii
D
i, iii
Answer:
A. i, ii, iii
Explanation:
A strong acid gets completely ionized in aqueous solutions releasing a large number of hydrogen ions. It also has a sour taste.
Hello Everyone ✌
hw r y'all doin
Pls answer the below questions
What is Malleability
What is ductility
What is Sonorous
Answer:
Malleability describes the property of a metal's ability to be distorted below compression. It is a physical property of metals by which they can be hammered, shaped and rolled into a very thin sheet without rupturing. A malleable fabric could be planate by blow or rolling.
Explanation:
Ductility is the property of a solid, like a metal, to deform under a tensile stress (force). So if you pull on two ends of a metal wire or bar, and it “stretches” you have a ductile substance. Though I must caution that you don't confuse the definition of ductile to mean elastic. They are not synonyms. It is the opposite of brittle. When a ductile item breaks, it is after necking, where the diameter of the wire in question reduces as the length elongated. A brittle, or non-ductile material simple tears apart in a sharp and quick fashion with little to no visible necking taking place.
sonorous: producing sound (as when struck)
Is the following nuclear equation balanced?
No
Yes
Answer:
Yes.
The nuclear equation {226/88 Ra → 222/26 Rn + 4/2 He} is balanced. As we know that an alpha particle is identical to a helium atom. This implies that if an alpha particle is eliminated from an atom's nucleus, an atomic number of 2 and a mass number of 4 is lost.
Therefore, the equation will be reduced to:
226 - 4 = 222
88 - 2 = 86
Hence, the equation is balanced.
Explanation:
Answer:
yes
Explanation:
s]imple yes
what's is area of square that has a side of 3.4cm
Answer:
11.56
Explanation:
Which of the following explains the VSEPR geometry of a water molecule?
O It is tetrahedral because there are four bonded pairs around oxygen.
O It is bent because there are four bonded pairs around oxygen.
O It is tetrahedral because there are two bonded pairs and two lone pairs around oxygen.
O It is bent because there are two bonded pairs and two lone pairs around oxygen.
According to VSEPR theory, geometry of water molecule is bent.
Water is a simple molecule consisting of one oxygen atom bonded to two different hydrogen atoms. The molecule adopts a bent structure because of the two lone pairs of electrons on the oxygen atom.The total number of electron pairs in the valence shell of the oxygen atom is 2.The resulting molecular shape is bent with an H-O-H angle of 104.5°.Learn more:
brainly.com/question/12775505
Answer:
It is tetrahedral because there are two bonded pairs and two lone pairs around oxygen.
Explanation:
Took it
Calculate the percent water in ZnSO4.7 H20. Show your work.
Answer:
43.8%
Explanation:
Find the sum of the relative atomic mass of all the elements constituting the compound, which is known as the relative formula mass;
[tex]M_{r} = Relative \ formula \ mass \\\\M_{r} \ of \ ZnSO_{4} = 65.4 + 32.1 + 4(16) \\\\M_{r} \ of \ ZnSO_{4} = 97.5 + 64 \\\\M_{r} \ of \ ZnSO_{4} = 161.5 \\\\M_{r} \ of \ H_{2}O = 18 \\\\M_{r} \ of \ ZnSO_{4}.7H_{2}O = 161.5 + 7(18) \\\\M_{r} \ of \ ZnSO_{4}.7H_{2}O = 287.5[/tex]
Then, divide the relative formula mass of all the water by that of the whole compound
w = % water
[tex]w = \frac{7(18)}{287.5} * 100 \\\\w = 0.43826... * 100\\\\w = 43.826...[/tex]
w = 43.8%
When a catalyst is added to a chemical reaction it provides a new reaction pathway that results in a different
Answer: That results in a different ALTERNATE pathway which has a LOWER ACTIVATION ENERGY.
Explanation:
There are many factors that affects a chemical reaction, these include'
--> surface area
--> concentration,
--> temperature,
--> pressure and
--> presence of CATALYST.
A CATALYST is defined as the substance that has the ability to alter the rate of a chemical reaction. Many reaction very slowly when left alone, but become faster when other substances are added. Such substances that merely alter the rate of reactions but do not take part in the reactions are called CATALYSTS.
Activation energy is defined as the energy barrier that must be overcome before a reaction takes place. A catalyst is able to increase the rate of a chemical reaction by decreasing the activation energy of the chemical system.
A catalyst provides an ALTERNATE PATHWAY for the reaction that has a LOWER ACTIVATION ENERGY. When activation energy is lower, more reactant particles have enough energy to react, so the reaction occurs faster.
Which of the following compounds is usually
added to a swimming pool to prevent the growth
of algae ?
A. Caso
B. Cuso
C. PbSO
D. MgSO
4
4
4
4
How do the Carnivorous plants survive without soil?
Answer:
A simple answer: Carnivores don't eat plants only flesh. So they would not need soil. But it would be hard for Carnivores to get energy because they get energy indirectly from the animals (herbivores) that they eat. How do they get the energy from a herbivore you might ask. Herbivores eat only plants and that gives the herbivore the plant's energy; but if the herbivore gets eaten, it is indirectly transferred into the Carnivore. Hope this helped!!
Carnivore = only feeds on flesh
Herbivore = eats only plants
Omnivore = eats plants and animals/flesh
ffg full form
gti
ccc
Answer:
Grand Tourer Injection
Cho m gam FeO tác dụng hết với dung dịch H2SO4, thu được 200 ml dung dịch FeSO4 1M. Giá trị của m là
Answer: The mass of [tex]FeO[/tex] required is 14.37 g
Explanation:
Molarity is calculated by using the equation:
[tex]\text{Molarity}=\frac{\text{Moles}}{\text{Volume}}[/tex] ......(1)
We are given:
Molarity of iron (II) sulfate = 1 M
Volume of solution = 200 mL = 0.200 L (Conversion factor: 1 L = 1000 mL)
Putting values in equation 1, we get:
[tex]\text{Moles of }FeSO_4=(1mol/L\times 0.200L)=0.200mol[/tex]
The chemical equation for the reaction of FeO with sulfuric acid follows:
[tex]FeO+H_2SO_4\rightarrow FeSO_4+H_2O[/tex]
By stoichiometry of the reaction:
If 1 mole of iron (II) sulfate is produced by 1 mole of FeO
So, 0.200 moles of iron (II) sulfate will produce = [tex]\frac{1}{1}\times 0.200=0.200mol[/tex] of FeO
The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
We know, molar mass of [tex]FeO[/tex] = 71.84 g/mol
Putting values in above equation, we get:
[tex]\text{Mass of }FeO=(0.200mol\times 71.84g/mol)=14.37g[/tex]
Hence, the mass of [tex]FeO[/tex] required is 14.37 g
Name the following aromatic hydrocarbon:
Explanation:
I think option 3..............
should i microwave a browney
Answer:
Ha why not but if it is not cooked.yes and yes and yes and absolutely yes. Yes do it
0.18 g of a divalent metal was completely dissolved in 250 cc of acidsolution containing 4.9 g H2SO4 per liter. 50 cc of theresidual acid solution required 20 cc of N/10 alkali forcomplete neutralization. Calculate the atomic weight of metal.
goodnight Gucci chunk cubic DDF if f Ch BK
gallium sulfide reacts with mercury(I) chloride
Answerquit
Explanation:snns
HELP NEEDED!!!
80.0 mL of Ba(OH)2(aq) solution is used to completely titrate 60.0 mL of 0.150 mol/L HCl(aq) solution. What is the concentration of the barium hydroxide solution in mol/L.
Answer:
0.1125 mol/L
Explanation:
application fomula:
C1V1=C2V2
C1 is concentration of Ba(OH)2
V1 is volume of Ba(OH)2
C2 is concentration of HCl
V2 is volume of HCl
ion has a mass number of 65, 36 neutrons, and a charge of +1
. Identify the element symbol, and determine the number of protons and electrons in this ion.
Answer:
Copper; Symbol is Cu
Protons = 29
Electrons = 29
Mass number = Protons + Neutrons
•°• Protons = Mass number - Neutrons
= (65-36)
= 29
Electrons is equal to the number of protons in a nucleus.
Hellppppp ASAP Will mark brainliest !!!!Which of the following metals is paramagnetic
A.Beryllium
B.Calcium
C.sodium
D.Magnesium
Answer:
A. Berryllium is a paramagnetic
Are your knees the elbows of your legs or are your elbows the knees of your
arms?
A.knees are elbows of your legs
B.elbows are knees of your arms
C.both
Answer:
Both :)
Explanation:
Knees and elbows are the types of joints that are present to move the parts of the body attached to it. The knees are the elbows, and the elbows are the knees.
What are joints?The joints knees and elbows work like the door and allow the movement of the attached body parts in back and forth directions.
The elbow of the arm region and the knee of the leg region have similar functions and are homologous in the function that moves the leg of the lower region and the arm of the upper region.
Therefore, option c. both is the correct option.
Learn more about knee and elbow here:
https://brainly.com/question/27056104