Slower growth rate is common characteristic of developing countries. Therefore, the correct option is option A.
What is developing countries?A sovereign state that is considered to be developing has a less developed industrial base with an HDI that is lower than other nations. This term is not generally accepted, though. Furthermore, there is no consensus on which nations fall into this category.
Although the phrase "low and middle-income country" (LMIC) is sometimes used synonymously, it only relates to the economies of the nations. In accordance with gross national income per capita, the World Bank divides the world's economy into four categories: high, upper-middle, lower-middle, as well as low income countries. Slower growth rate is common characteristic of developing countries.
Therefore, the correct option is option A.
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Aluminum reacts with chlorine gas to form aluminum chloride
via the following reaction:
2A1 + 3Cl2 + 2AlCl3
How many grams of aluminum chloride could be produced by
reacting 34.0 g of aluminum and 39.0 g of chlorine gas?
Mass is the multiplication product of moles and the molar mass of the substance. The mass of aluminum chloride in the reaction is 48.95g.
What are grams?Grams are the unit of the measurement of the substance used to calculate the weight of the substance in a compound or molecule.
The balanced chemical reaction is given as:
[tex]\rm 2Al (s) + 3Cl_{2} (g) \rightarrow 2AlCl_{3} (s)[/tex]
Given,
Mass of aluminium = 34.0 gm
Mass of chlorine gas = 39.0 gm
The moles of aluminum is calculated as:
[tex]\dfrac{34}{27} = 1.26[/tex]
The moles of chlorine gas are calculated as:
[tex]\dfrac{39}{2 \times 35.5} = 0.55[/tex]
From the moles, it can be seen that aluminum is in excess so further calculations will be done based on the moles of chlorine gas.
Moles of aluminum chloride are calculated as:
[tex]\dfrac{0.5500 \;\rm mol \; Cl_{2} \times 2 \;\rm mol \; AlCl_{3}}{3 \;\rm mol \; Cl_{2}} = 0.3667 \;\rm mol \;\rm AlCl_{3}[/tex]
Moles of aluminum chloride are 0.3667 and the molar mass is 133.341 g/mol. The mass is calculated as:
[tex]0.3667 \times 133.341 = 48.8961[/tex]
Therefore, 48.95 gm is the mass of aluminum chloride.
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Element X has two known isotopes. If 83% of the sample weighs 76 amu and the remaining 17% weighs 73.6 amu, what is the atomic mass of element X
Answer:
The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit (amu, also known as daltons, D). The atomic mass is a weighted average of all of the isotopes of that element, in which the mass of each isotope is multiplied by the abundance of that particular isotope. (Atomic mass is also referred to as atomic weight, but the term "mass" is more accurate.)
121
P(1)(1 + i)
1 + 11) 121 - 1
M = (1 + )
Answer:
121
Explanation:
add 1+120 to get answer
why sodium chloride has a hiegher melting point
Answer:
Explanation:
Sodium chloride has a high melting and boiling point
There are strong electrostatic attractions between the positive and negative ions, and it takes a lot of heat energy to overcome them. Ionic substances all have high melting and boiling points.
What is the scientific name for the substance that is dissolving in a solution?
Answer:
The solute is the substance that is being dissolved,
Explanation:
A solution is a homogeneous mixture consisting of a solute dissolved into a solvent .
Answer:
solutes
Things which dissolve are called solutes and the liquid in which they dissolve is called a solvent to form a solution. Strongly polar substances easily attract water molecules. The water molecules surround the charged solute.
Explanation:
Took the same test and that was the one that was right hope this helps you
When a mixture of rock pieces, salt and water is filtered, what will be found as the filtrate and what will be found as the residue
Answer:
Filtrate: Mixture of salt and water.
Residue: rock pieces
Answer:
Salt solution will be the filtrate
and the rock pieces will be the residue.
Explanation:
This is because salt is soluble in water and hence
it cannot be filtered out of water giving as a salt solution as the filtrate and since the rock pieces are not soluble in water they are left out and they become the residue.
How many oxygen atoms are represented by the formula Fe(CIO4)3? iron(III) chlorate
3
16
12
4
Answer:
12
Explanation:
the 4 by the element symbol O multiplied by the 3 on the outside of the parentheses
Answer:
[tex]\boxed {\boxed {\sf C. \ 12 \ oxygen \ atoms }}[/tex]
Explanation:
We are given the chemical formula:
[tex]Fe(ClO_4)_3[/tex]
There are 3 elements here:
Fe: Iron Cl: ChlorineO: OxygenThe question asks for the number of oxygen atoms, so we can just focus on the O in the formula.
The O has a subscript of 4, indicating there are 4 oxygen atoms in the compound. But the compound is also enclosed in parentheses with a subscript of 3. Therefore, there are 3 of the compounds with 4 oxygen atoms.
We can multiply 3 and 4.
3*4= 12There are 12 oxygen atoms.
Why do you organisms live in deep water bottom zone Of Standing water ecosystems
Answer:
Deeper water, where too little sunlight penetrates for photosynthesis, is called the aphotic zone. Surface water dissolves oxygen from the air, so there is generally plenty of oxygen in the photic zone to support organisms. Water near shore usually contains more dissolved nutrients than water farther from the shore
Explanation:
3. A reaction of the type X → Y + Z has a rate constant k = 3.6 x 10-5 M/s. Determine
molarity of x after a reaction time of 30.0 min if the initial concentration of x is
0.096M
(3 marks)
Answer:
0.16 M.
Explanation:
Hello!
In this case, since the reaction can be determined as zeroth-order because of the units of M/s, we can write the rate law as:
[tex][X]=[X]_0-kt[/tex]
In such a way, since we need the initial concentration of X, we proceed as follows:
[tex][X]_0=[X]+kt[/tex]
So we plug in to obtain:
[tex][X]_0=0.096M+3.6x10^{-5}\frac{M}{s}*30.min*\frac{60s}{1min}[/tex]
[tex][X]_0=0.16M[/tex]
Best regards!
What happens when sodium and sulfur combine?
A) each sodium atom gains one electron
B) each sulfur atom loses one electron
C) each sodium atom loses one electron
D) each sulfur atom gains one electron
Answer:
BBBBBBBB ITS B
Explanation:
What is the molecular formula of aluminum chloride containing 20.2% by mass of aluminum and 79.8% My mess of chlorine. The relative molecular mess is 267 g.
The molecular formula : Al₂Cl₆
Further explanationGiven
20.2% by mass of Aluminum and 79.8% by mass of Chlorine.
Required
the molecular formula
Solution
Empirical formulaAluminium (Ar=27 g/mol)
[tex]\tt \dfrac{20.2}{27}=0.748[/tex]
Chlorine(Ar=35.5 g/mol)
[tex]\tt \dfrac{79.8}{35.5}=2.248[/tex]
mol ratio Al : Cl =
[tex]\tt \dfrac{0.748}{0.748}\div \dfrac{2.248}{0.748}=1\div 3[/tex]
So the empirical formula = AlCl₃
(Empirical formula)n=Molecular formula
(27+3.35.5)n=267
(133.5)n=267⇒n=2
The molecular formula : Al₂Cl₆
Given that nitrogen forms three bonds with hydrogen to make [tex]NH_{3}[/tex], how many hydrogen atoms do you think will bond with an atom of phosphorus, which is in the same family as nitrogen? Explain your reasoning.
Answer:
Three hydrogen atoms to form PH₃.
Explanation:
Hello!
In this case, since the elements belonging to the nitrogen family (N, P, As, Sb and Bi) show five valence electrons, because there are five electrons at their outer shell, it is clear that if phosphorous bonds with hydrogen, it is going to require the same amount of oxygen atoms (3) because elements having five valence electrons need 3 bonds in order to attain the octet (5+3=8).
Therefore the compound would be:
[tex]PH_3[/tex]
Which is phosphine.
Best regards!
Which option is correct ?
Which one of the following is not a metal catalyst for the hydrogenation of an alkene?a. Pdb. Ptc. Nad. Ni
Explanation: nad .......
Sodium is not use, as a metal catalyst for the hydrogenation of an alkene. Therefore, option C is correct.
What is hydrogenation ?Hydrogenation is the chemical reaction that occurs when molecular hydrogen reacts with another compound or element, typically in the presence of a catalyst such as nickel, palladium, or platinum. Organic compounds are commonly reduced or saturated using this method.
A hydrogenation reaction is an example of an alkene addition reaction. Two hydrogen atoms are added across the double bond of an alkene in a hydrogenation reaction, resulting in a saturated alkane.
To activate the chemical reaction between hydrogen and another compound, hydrogenation catalysts, typically made of iridium, nickel, palladium, platinum, rhodium, or ruthenium, are used.
Therefore, option C is correct.
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Which of the following equations is balanced?
Answer:
wheres the image
Explanation:
what is a chemical equation for the corrosion of metal
Answer:
[tex]M+e^-\rightarrow M^+[/tex]
Explanation:
Hello!
In this case, since corrosion is a reaction by which a metal is oxidized to a form in which it has a higher oxidation state due to the fact that it loses electrons and therefore it becomes positively charged. In such a way, for a general metal M, we could have the following corrosion reaction:
[tex]M+e^-\rightarrow M^+[/tex]
The amount of electrons and the resulting oxidation state depend upon the nature of the metal, for instance, we can see it for silver, zinc and aluminum:
[tex]Ag+e^-\rightarrow Ag^+\\\\Zn+2e^-\rightarrow Zn^{2+}\\\\Al+3e^-\rightarrow Al^{3+}[/tex]
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How many moles of a solute is contained in 500mL of a 2.5 M solution?
Answer:
100M
Explanation:
What is the characteristic of atoms
Answer:
Most of the atom is empty space. The rest consists of a positively charged nucleus of protons and neutrons surrounded by a cloud of negatively charged electrons. The nucleus is small and dense compared with the electrons, which are the lightest charged particles in nature.
What is the mass of 0.20 moles of Ga₂(SO₃)₃?
Answer:
75.924 g
Explanation:
To answer this question we first need to calculate the molar mass of Ga₂(SO₃)₃:
Molar Mass of Ga₂(SO₃)₃ = (Molar Mass of Ga)*2 + (Molar Mass of SO₃)*3
Molar Mass of SO₃ = Molar Mass of S + (Molar Mass of O)*3 = 80.06 g/molMolar Mass of Ga₂(SO₃)₃ = (69.72 g/mol)*2 + (80.06 g/mol) * 3
Molar Mass of Ga₂(SO₃)₃ = 379.62 g/molThen we convert 0.20 moles to grams, using the molar mass of Ga₂(SO₃)₃:
0.20 mol Ga₂(SO₃)₃ * 379.62 g/mol = 75.924 gMass of 0.20 moles of Ga₂(SO₃)₃ is 75.924 g
Number of moles:It is defined as the ratio of given mass over molar mass.
Given:
Number of moles= 0.20 moles
To find:
Mass=?
We need to calculate molar mass of Ga₂(SO₃)₃ first:
Molar Mass of Ga₂(SO₃)₃ = (Molar Mass of Ga)*2 + (Molar Mass of SO₃)*3
Molar Mass of SO₃ = Molar Mass of S + (Molar Mass of O)*3 = 80.06 g/mol
Molar Mass of Ga_2(SO_3)_3 = (69.72 g/mol)*2 + (80.06 g/mol) * 3
Molar Mass of Ga₂(SO₃)₃ = 379.62 g/mol
Then we convert 0.20 moles to grams, using the molar mass of Ga₂(SO₃)₃:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}} \\\\\text{Given mass}=\text{Number of moles}*\text{Molar mass}\\\\\text{Given mass}=0.20 moles*379.62 g/mol\\\\\text{Given mass}=75.92 grams\\[/tex]
Thus, the mass of 0.20 moles of Ga₂(SO₃)₃ is 75.92 grams.
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Element X has two known isotopes. If 83% of the sample weighs 76 amu and the remaining 17% weighs 73.6 amu, what is the atomic mass of element X
Answer:
The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit (amu, also known as daltons, D). The atomic mass is a weighted average of all of the isotopes of that element, in which the mass of each isotope is multiplied by the abundance of that particular isotope. (Atomic mass is also referred to as atomic weight, but the term "mass" is more accurate.)
How does wood produce chemical energy?
Wood absorbs oxygen to produce chemical energy.
Wood absorbs solar radiation to make chemical energy
Wood absorbs nitrogen gas to make chemical energy.
All living organisms produce unlimited amount of chemical energy.
Answer:
Wood absorbs solar radiation to make chemical energy.
The chemical energy of wood has been absorbed by solar radiation. Thus, option B is correct.
The wood has been the source of energy by the burning for a long duration. The chemical energy has been stored in the dry wood has been converted to light and heat energy on burning.
The energy stored in the wood has been comprised by photosynthesis, where the solar energy has been entrapped in the wood and is converted to chemical energy that is stored.
Thus, the chemical energy of wood has been absorbed by solar radiation. Thus, option B is correct.
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Uranium-235 undergoes nuclear fission as shown in the diagram below. A small gray ball labeled n impacts a large mass of red and gray balls labeled superscript 235 subscript 92 upper U. The impact gives off a smaller mass of balls labeled superscript 139 subscript 56 upper B a, a starburst labeled 200 megavolts, which in turn gives off 2 balls labeled n; and another smaller mass of balls labeled X. Which element does X represent? Superscript 95 Subscript 36 Baseline Upper K r Superscript 96 Subscript 36 Baseline Upper K r Superscript 97 Subscript 36 Baseline Upper K r Superscript 98 Subscript 36 Baseline Upper K r
Answer:
95/36 Kr or A
Explanation:
In the given nuclear fission reaction, X represents ⁹⁵₃₆Kr. Therefore, the correct option is option A.
What is nuclear fission?Nuclear fission is the splitting of a nucleus of heavy atoms, such that of plutonium or uranium, into two roughly equal mass fragments. A significant amount of energy is released during the process. The core of an atom splits into two nuclei that are lighter during nuclear fission.
When the nucleus is excited by a variety of particles (such as neutrons, protons, deuterons, and alpha particles) or by electromagnetic radiation takes the form of gamma rays, the process may occur spontaneously or be induced. In the given nuclear fission reaction, X represents ⁹⁵₃₆Kr.
Therefore, the correct option is option A. In the given nuclear fission reaction, X represents ⁹⁵₃₆Kr.
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Your question is incomplete but most probably your full question was,
What must a scientist do in order to develop a testable hypothesis?
A. Research accepted scientific theories to find one that is wrong.
B. Determine whether the conclusion is supported by popular opinion.
C. Find out whether the idea would be interesting to other scientists.
D. Ask a question that can be answered by making observations.
Answer:
The correct answer is D. Ask a question that can be answered by making observations.
Explanation:
Basically, in order to develop a testable hypothesis, scientists must adhere to the guidelines of the scientific method.
The scientific method is usually understood to be a so-called hypothetical-deductive method, the core of which is to make hypotheses based on observations or measurements, to make predictions based on them and to check the validity of predictions by repeated experiments. More generally, the scientific method is a general way of obtaining solid knowledge, using many means of proof, both empirical and theoretical, to achieve certainty. The scientific method is a widely recognized tool in the scientific community for seeking objectivity, reliability and transparency in research.
Does the octet rule state that all elements except Hydrogen and Helium want eight (8) valence electrons?
Answer:
yes
Explanation:
PLS HALP ASAP points
Answer:
50 N ( left)
Explanation:
Given data:
The force on right side = 450 N
The force on left side = 500 N
Net force = ?
Solution:
F (net) = 500 N - 450 N
F (net) = 50 N ( left)
Calculate the distance Jupiter in miles if it has an AU of 5.2
93,000,000 miles
O 465,400,000 miles
O 483, 600, 000 miles
Which segment of this graph shows a decreasing velocity?
Answer:
The segment of this graph that shows a decreasing velocity is the EF segment. AB and DE segments show that whatever was moving, in these segments was stopped. The segment BC shows an increase in velocity - the metres travelled were always more as the time went by.
Explanation:
PLEASE HELP!!!! WILL GIVE BRANLIEST!!
Answer:
help with what...
..
........
The equilibrium constant, Kc, for the following reaction is 1.29E-2 at 600 K. COCl2(g) CO(g) Cl2(g) Calculate the equilibrium concentrations of reactant and products when 0.280 moles of COCl2(g) are introduced into a 1.00 L vessel at 600 K. [COCl2]
Answer:
At Equilibrium
[COCl₂] = 0.226 M
[CO] = 0.054 M
[Cl₂] = 0.054 M
Explanation:
Given that;
equilibrium constant Kc = 1.29 × 10⁻² at 600k
the equilibrium concentrations of reactant and products = ?
when 0.280 moles of COCl2(g) are introduced into a 1.00 L vessel at 600 K. [COCl²]
Concentration of COCl₂ = 0.280 / 1.00 = 0.280 M
COCl₂(g) ----------> CO(g) + Cl₂(g)
0.280 0 0 ------------ Initial
-x x x
(0.280 - x) x x ----------- equilibrium
we know that; solid does not take part in equilibrium constant expression
so
KC = [CO][Cl₂] / COCl₂
we substitute
1.29 × 10⁻² = x² / (0.280 - x)
0.0129 (0.280 - x) = x²
x² = 0.003612 - 0.0129x
x² + 0.0129x - 0.003612 = 0
x = -b±√(b² - 4ac) / 2a
we substitute
x = [-(0.0129)±√((0.0129)² - 4×1×(-0.003612))] / [2 × 1 ]
x = [-0.0129 ± √( 0.00017 + 0.01445)] / 2
x = [-0.0129 ± 0.1209] / 2
Acceptable value of x =[ -0.0129 + 0.1209] / 2
x = 0.108 / 2
x = 0.054
At equilibrium
[COCl₂] = (0.280 - x) = 0.280 - 0.054 = 0.226 M
[CO] = 0.054 M
[Cl₂] = 0.054 M
How did Mendeleeb come up woth the periodic table?
Answer:
Mendeleev jotted down the symbols for the chemical elements, putting them in order according to their atomic weights and inventing the periodic table.
Answer:
On 17 February 1869, Russian chemist Dmitri Mendeleev jotted down the symbols for the chemical elements, putting them in order according to their atomic weights and inventing the periodic table. So convinced was he of the soundness of his periodic law that he left gaps for these elements in his table.