Answer:
C. Cutting your hair
Explanation:
A physical change is one of the two types of changes in nature (the other being chemical change). A physical change does not affect the chemical composition of the substance(s) involved.
In this case, "CUTTING ONE'S HAIR" is an example of physical change because it involves the removal of the hair without altering the chemical composition of the hair. However, other examples given in the options of this question like digestion of food, getting a suntan (change in skin coloration), and growth in height all involve a change in the chemical nature of the parts involved, hence, they are examples of chemical changes.
Hybridization of carbons in CH3-CH= C = CH2 is
a) sp3sp3, sp2 sp2
b) sp3. sp2, sp, sp3
c) sp3, sp3, sp2, sp3
d) sp3, sp2, sp, sp1
Answer:
A carbon atom bound to three atoms (two single bonds, one double bond) is sp2 hybridized and forms a flat trigonal or triangular arrangement with 120° angles between bonds. Notice that acetic acid contains one sp2 carbon atom and one sp3 carbon atom.
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
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.
121
P(1)(1 + i)
1 + 11) 121 - 1
M = (1 + )
Answer:
121
Explanation:
add 1+120 to get answer
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.
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.
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.
To know more about nuclear fission, here:
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Your question is incomplete but most probably your full question was,
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
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:
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!
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)
What type of radioactive decay will the isotopes 13B and 188Au most likely undergo?
a. Beta emission, positron emission
b. Beta emission, beta emission
c. Positron emission, beta emission
d. Positron emission, positron emission
Answer:
b. Beta emission, beta emission
Explanation:
A factor to consider when deciding whether a particular nuclide will undergo this or that type of radioactive decay is to consider its neutron:proton ratio (N/P).
Now let us look at the N/P ratio of each atom;
For B-13, there are 8 neutrons and five protons N/P ratio = 8/5 = 1.6
For Au-188 there are 109 neutrons and 79 protons N/P ratio = 109/79=1.4
For B-13, the N/P ratio lies beyond the belt of stability hence it undergoes beta emission to decrease its N/P ratio.
For Au-188, its N/P ratio also lies above the belt of stability which is 1:1 hence it also undergoes beta emission in order to attain a lower N/P ratio.
Radioactive decay refers to the loss of energy by an unstable atomic nucleus as radiation. The substance having unstable nuclei is radioactive.
The correct answer is:
Option B. Beta emission, beta emission
The radioactive decay of 13B and 188 Au can be explained as:
1. Neutron proton ratio refers to the particular nuclei that will undergo what type of radioactive decay.
For B-13, there are 8 neutrons and 5 protons, thus, the ratio is 1.6.For Au -188, there are 109 neutrons and 79 protons, thus, the ratio is 1.4.2. In the B-13 element, the N/P ratio is beyond the stability of the atom, thus, it will emit beta emission to reduce the N/P ratio.
3. Similarly, the N/P ratio of the Au-188 is above the stability of the atom, thus, it undergoes the beta emission to reduce the N/P ratio.
Thus, the correct answer is Option B.
To know more about radioactive decay, refer to the following link:
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What is the freezing point in °C) of a 0.195 m
aqueous solution of K2S?
Enter your rounded answer with
3 decimal places.
K for water = 1.86 °C/m
Answer:
[tex]T_S=-1.09\°C[/tex]
Explanation:
Hello!
In this case, since the freezing point depression for a solution is computed via:
[tex](T_S-T_W)=-imK_f[/tex]
Whereas TW is the freezing temperature of water, TS that of the solution, i the van't Hoff's factor (3 for K2S as it ionizes properly), m the molality of the solution and Kf the freezing point constant of water. Thus, we plug in to obtain:
[tex](T_S-0\°C)=-3*0.195m*1.86\frac{\°C}{m}\\\\T_S=-1.09\°C[/tex]
Best regards!
The correct answer is -1.088. (Don't forget the negative sign).
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
How many moles of a solute is contained in 500mL of a 2.5 M solution?
Answer:
100M
Explanation:
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.
Learn more:
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Does the octet rule state that all elements except Hydrogen and Helium want eight (8) valence electrons?
Answer:
yes
Explanation:
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:
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.
In which type of mirror do you see the most realistic virtual image
Plane
Convex
Concave
Duplex
Phan
convex
concave
duplex
What mass of nitrogen occupies a volume of 11.2 L, if 4.20 g of nitrogen occupies 100. L?
Answer:
0.47 g
Explanation:
From the question given above, we obtained the following information:
4.20 g of nitrogen occupies 100 L.
We can obtain the mass of nitrogen that occupied 11.2 L by doing the following:
4.20 g of nitrogen occupies 100 L.
Therefore, Xg of nitrogen will occupy 11.2 L i.e
Xg of nitrogen = (11.2 × 4.2) / 100
Xg of nitrogen = 0.47 g
From the calculation made above, 0.47 g of nitrogen will occupy 11.2 L
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:
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.
Molecules Have?
A. Only kinetic energy
B. Only potential energy
C. Both kinetic and potential energy
D. Neither potential nor kinetic
Answer:
C
Explanation:
Because molecules of solids don't move
while molecules of liquids and gases move.
I Hope this helps!!.
PLEASE HELP!!!! WILL GIVE BRANLIEST!!
Answer:
help with what...
..
........
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.)
Which of the following equations is balanced?
Answer:
wheres the image
Explanation:
What is the degree of oxidation of a simple substance
Answer: The oxidation state of a free element (uncombined element) is zero. For a simple (monoatomic) ion, the oxidation state is equal to the net charge on the ion. For example, Cl– has an oxidation state of -1. When present in most compounds, hydrogen has an oxidation state of +1 and oxygen an oxidation state of −2.
Hope this helps...... Stay safe and have a Merry Christmas!!!!!!!!!!! :D
Explanation:
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.
For more information about the stored energy of wood, refer to the link:
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A fish company delivers 15 kg of salmon 4.7 kg Of crab and 1.76 kg of oysters to your seafood restaurant what is the total mass in kilograms of the seafood
Answer:
21.46 kg.
Explanation:
Hello!
In this case, when a variety of measurements are said to contribute to a total, we understand we need to add them all up in order to get that total; in such a way, since the given seafood is composed by 15 kg of salmon, 4.7 kg of crab and 1.76 kg of oysters, the total mass turns out:
[tex]m_T=15kg+4.7kg+1.76kg\\\\m_T=21.46kg[/tex]
Best regards!