The reason why chemists synthesize polymers in the lab is;
because of the need to perform and observe the results of a variety of synthesized polymer reactions and to predict when a reaction will happen.
Polymers are simply defined as a substance or material made up of long repeating chemical chains of molecules.
Now, polymer synthesis is simply called polymerization and it is the process by which smaller molecules called monomers undergo covalent bonding to form a longer polymer chain.
Now, from the definition above, the reason why chemists synthesize polymers in the lab is because of the need to perform and observe the results of a variety of synthesized polymer reactions and to predict when a reaction will happen.
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Assume that the total volume of a metal sample is the sum of the volume occupied by the metal ions making up the lattice and the (separate) volume occupied by the conduction electrons. The density and molar mass of the first metal are 911 kg/m3 and 27.7 g/mol, respectively; assume the radius of an ion is 97.3 pm. (a) What percent of the volume of a sample of this metal is occupied by its conduction electrons
Answer:
92.4%
Explanation:
The volume per cubic meter of sodium preoccupy by the sodium ions is
[tex]V_{Na} = n \times V[/tex]
where;
volume (V) of each Na atom = [tex]\dfrac{ 4}{3} \pi r^3[/tex]
Radius of each ion = 97.3 pm = 97.3 × 10⁻¹²
no.of atoms in the sample n = mass of the sample / ( molar mass / NA)
mass of the sample per cubic metre = 911 kg/m³
∴
[tex]V = \bigg [ \dfrac{4}{3} \pi r^3 \bigg ] \bigg [\dfrac{MN_A}{m} \bigg ][/tex]
[tex]V = \bigg [ \dfrac{4}{3} \pi (97.3 \times 10^{-12} )^3 \bigg ] \bigg [\dfrac{ (911 kg/m^3 (m^3))(6.023\times 10^{23})}{27.7 \times10^{-3}\ kg/mol } \bigg ][/tex]
V = 0.07643 m³
The fraction of available conduction electrons are;
= (1 - V)
= 1 - 0.07643
= 0.92357
≅ 92.4%
what is the balanced equation for naphthalene and sulphur?
napthalene: C10H8 sulphur: S02
Explanation:
C10H8
Giselle is working with a chemical substance in a laboratory. She observes that when the chemical is heated, it gives off a gas. She assumes that the gas is oxygen but decides to test this assumption to verify it. Which type of scientific knowledge is Giselle’s assumption? A. fact B. hypothesis C. law D. observation E. theory
Answer:
The correct answer is B. Hypothesis
Explanation:
why is it important to prepare for disaster? what are the things you need to prepare?
Explanation:
The reason why it is important to prepare for an disaster is because Being prepared can reduce fear, anxiety, and losses that accompany disasters. People also can reduce the impact of disasters (flood proofing, elevating a home or moving a home out of one's harm's way, and securing items that could shake loose in an earthquake) and sometimes avoid the danger completely.
The things you need to prepare for an disaster is
WaterFoodClothing Money if neededFlash lightBatteriesFirst aid kitYou can even need an radio( to keep updated).4. Kendrick drags his bat out to play baseball. which statement best describes the science of what he did?
O Kendrick would use less energy if he dragged the bat faster.
Kendrick did not have to work to move the bat because he dragged it.
Kindrick gave the bat potential energy.
Kindrick gave the bat kinetic energy.
Explanation:
Kendrick gave the bat potential Energy
Explain how atomic
radius, valence electrons
and effect nuclear charge
creates the trend for metal
reactivity.
Answer:A higher effective nuclear charge causes greater attractions to the electrons, pulling the electron cloud closer to the nucleus which results in a smaller atomic radius. Down a group, the number of energy levels (n) increases, so there is a greater distance between the nucleus and the outermost orbital.
Answer:
A higher effective nuclear charge causes greater attractions to the electrons, pulling the electron cloud closer to the nucleus which results in a smaller atomic radius. Down a group, the number of energy levels increases, so there is a greater distance between the nucleus and the outermost orbital.Explanation:
Consider the equation:
4Al + 3O2 = 2Al2O3
Is this equation balanced? Why or why not?
The equation is balanced. There are 4 aluminium atoms and 6 oxygen atoms on each side.
dipole dipole bonds are covalent bond?
Answer:
The polar covalent bond is much stronger in strength than the dipole-dipole interaction. The former is termed an intramolecular attraction while the latter is termed an intermolecular attraction. So now we can define the two forces: Intramolecular forces are the forces that hold atoms together within a molecule.
Explanation:
I have some things to point out:
#1: There is no such thing as "Dipole-dipole bonds", only Dipole-dipole interactions between molecules that share an unequal balance of electrons between their atoms.
#2: Intermolecular forces of attraction such as Dipole-dipole interactions are not considered as covalent bonds. Covalent bonds are rigid and are considered intramolecular forces of attraction (found within the molecule instead of between)
Hope I have helped you! Many thanks.
what is a common use for electromagnets
Answer:
Electromagnets are widely used as components of other electrical devices, such as motors, generators, electromechanical solenoids, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment.
Explanation:
Hope this helps :)
(didn't get this from the internet)
Which of the following statements is true about exothermic reactions?
Answer:
An Exothermic Reaction , gives off more heat, and a little energy to its surroundings.
this can helps us figure out that the answer is , C, More heat is given off into its products.
Explanation:
At which point is crust neither created nor destroyed?
island chain
mid-ocean ridge
divergent boundary
transform boundary
Answer:
transform battery
Explanation:
Answer: D. Transform Boundary
Explanation: I did the test.
What are the rules for writing
names/formulas for ionic
compounds? Give examples
where you need to produce
the formula from the name
AND the name from the
formula. Make sure to
include examples of
transition metals and
polyatomic ions.
Which chemical equation below is not balanced?
- 3 MgSO4 + 2 Nag PO4 → Mgs (PO4),+3 Na, S04
- 2 NaOH + HNO, → NaNO, + 2 H,0
- CH12 O6 4 6O2 → 6 CO, + 6 H,0
- HBr AGNO, → HNO, + AgBr
pic if needed ;)
Answer:
B
Explanation:
The second one is not balanced correctly.
2 NaOH + 2HNO3 → 2NaNO3 + 2 H20
I didn't notice this before but it can be balanced without the twos.
NaOH + HNO3 → NaNO3 + H20
It was still wrong. It needed to have the twos removed, not 2 more added. Adding two more isn't wrong, but it should be balanced without 2s if at all possible.
What is the atomic number of this atom?
6
8
9
16
The atomic number of this atom : 8
Further explanationGiven
Atomic model (attached)
Required
The atomic number
Solution
To determine the atomic number of an element, we can look at the number of electrons or the number of protons, because
atomic number = number of protons = number of electrons in neutral atoms
While the mass number is the number of neutrons + the number of protons located in the atomic nucleus
The charge of each of these atomic sub particles:
electron: charge -1proton: charge +1neutron: not charged / 0If we look at this atomic model, there are 8 electrons in the shell, consisting of 2 electrons in the first shell and 6 electrons in the second shell (which can also be called valence electrons)
Whereas in the atomic nucleus there are 8 protons and 10 neutrons
Answer:8
Explanation:
1s2 3s2 3p6 3s2 3p6 3d6 4s2 what is element
The element with the electron configuration, 1s2 3s2 3p6 3s2 3p6 3d6 4s2, will be iron.
Atomic number and electronic configurationsIn the electronic configuration of elements, the number of electrons possessed by the element is shared into the orbitals according to their energy levels.
The electrons are first shared in orbitals in the same energy level before pairing starts.
Also for neutral atoms, the number of electrons is equivalent to the number of protons. The number of protons in itself represents the atomic number of elements.
Thus, considering this electron configuration, 1s2 3s2 3p6 3s2 3p6 3d6 4s2; the total number of electrons in all the orbitals is 26. The element with the atomic number of 26 is iron.
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Which process is constructive?
A:Water wears away rocks in a river.
B:Wind removes sand from a beach.
C:volcano forms an island in the ocean.
D:An earthquake breaks apart a cliff on a mountain.
A gas is brought to a final pressure of 6.8 atm. after increasing its temperature from 40 K to 280 K. Calculate the original pressure of the gas.
Answer:
0.97 atm.
Explanation:
From the question given above, the following data were obtained:
Final pressure (P2) = 6.8 atm
Initial temperature (T1) = 40 K
Final temperature (T2) = 280 K
Initial pressure (P1) =?
Thus, we can obtain the initial (original) pressure of the gas as follow:
P1/T1 = P2/T2
P1 /40 = 6.8/280
Cross multiply
P1 × 280 = 40 × 6.8
P1 × 280 = 272
Divide both side by 280
P1 = 272/280
P1 = 0.97 atm
Therefore, the original pressure of the gas is 0.97 atm.
a wooden block with a mass of 2.0kg starts from at the top of an inclined plane and ends with a force of 25N at the bottom what was the rate of acceleration of the block
Answer:
Force F = 20N .
Mass m = 2.0 kg
Initial velocity u = 0
acceleration, a = 10m/s
2
t = 1 sec.
Now Refer to the attachment, See the free body diagram of the block.
Force works on the block:-
Weight, W = mg
W = 2 × 10
W = 20N (which is Downward)
Normal force N = mg cos37
N = 20 × 0.80
N = 16 N. (perpendicular & upward to the plane )
Here Applied Force, P = 20N (which is down along the plane)
Now For Final Speed, We know the formula:-
v = u + at
v = 0 + 10 × 1
v = 10 m/s
the Distance travelled s = ut + 0.5 at×t
s = 0 + 0.5 ×10×1×1
s = 5 m.
Now,
(a) So work done by the force of gravity in 1 sec. = F × d
⇒20 N × 5m
⇒100 J.
(b) Here the weight act as downward, so distance travelled in downward.
⇒5 × sin37
⇒5 × 0.6
⇒3 m.
so work done by gravity,
⇒20 N × 3 m
⇒60 J.
(c) Now, work done by all the forces
⇒change in Kinetic energy
⇒
2
1 m(v2
−u 2
)
⇒0.5×2.0×(10 2
−0 2 )
⇒ 100 J.
⇒W.D by frictional force
= work was done by all forces -( work was done by Normal force + work done by applied force + work done by gravity )
= 100 J - (100 + 60 +0 )
= 100 - 1
Hope this helps you≅
The concentration of CI ion in a sample of H,0 is 15.0 ppm. What mass of CI ion is present in 240.0 mL of H,0, which has a density of 1.00 g/mL?
Answer:
Mass of solute = 0.0036 g
Explanation:
Given data:
Concentration of Cl⁻ = 15.0 ppm
Volume of water = 240 mL
Mass of Cl⁻ present = ?
Solution:
1 mL = 1 g
240 mL = 240 g
Formula:
ppm = mass of solute / mass of sample ×1,000,000
by putting values,
15.0 ppm = (mass of solute / 240 g) ×1,000,000
Mass of solute = 15.0 ppm × 240 g / 1,000,000
Mass of solute = 0.0036 g
What is the hardest mineral to burn in the world?
Answer:
Diamond
Explanation:
The molar solubility of CaSO4 in water is 0 .67 gram per liter of solution. Calculate the Ksp.
Answer:
Ksp = 2.4 * 10⁻⁵
Explanation:
The equation for the dissolution and dissociation of CaSO4 in water is given as: CaSO₄ ---> Ca²⁺ + SO₄²⁻
The expression for the Ksp of the dissociation equation above is:
Ksp = [Ca²⁺] [SO₄²⁻]
The molar ratio of the dissociated ions and the solute is 1 : 1, this means that every 1 mole of CaSO₄ that dissolves produces 1 mole of Ca²⁺ and SO₄²⁻ each
The molar solubility of a substance is the number of moles that dissolve per liter of solution.
molar solubility of CaSO₄ = number of moles /liter of solution
number of moles of CaSO₄ = mass/molar mass
molar mass of CaSO₄ = 136 g/mol
number of moles of CaSO₄ = 0.67/136 = 0.0049 moles
molar solubility of CaSO₄ = 0.0049 mol/ 1 L = 4.9 * 10⁻³ moles per liter
therefore, molar solubility of CaSO₄ = 4.9 * 10⁻³
Ksp = (4.9 * 10⁻³) (4.9 * 10⁻³)
Ksp = 2.4 * 10⁻⁵
Answer:
2.4 * 10^-5
Explanation:
Molar solubility of CaSO4 = 0 .67 g/L/136 g/mol = 4.9 * 10^-3 Mol/L
Given that;
CaSO4(s) -------> Ca^2+(aq) + SO4^2-(aq)
Hence, Ksp = [Ca^2+] [SO4^2-]
Where [Ca^2+] =[SO4^2-]=s
Ksp = s^2
since s = 4.9 * 10^-3 Mol/L
Ksp = (4.9 * 10^-3 Mol/L)^2
Ksp = 2.4 * 10^-5
someone please help me, the picture is shown above !
5 A snowball sits at the top of the hill. Which of the following changes will increase the kinetic energy of the snowball? A Additional snow falls on the snowball, increasing its mass. B The snowball is pushed and rolls down the hill, gaining speed. The weather warms and the snowball melts, decreasing its mass. D The snowball is moved and now sits on a hill that is higher.
Answer:
B
Explanation:
it is B because in order to have kinetic energy the object has to be in motion, because if it wasnt in motion and sitting on the hill then it has potentail energy, hope this helps
What kind of reactions tend to be spontaneous?
O A. Reactions that are endothermic
B. Reactions that are exothermic
C. Reactions that decrease in entropy
D. Reactions that increase in enthalpy
The spontaneous reactions are said to be exothermic in nature. Hence, option B is correct.
What is a spontaneous reaction?The type of reaction that has not been utilizing energy input output to the reaction system in order to favor the formation of product are termed as exothermic reaction.
The entropy has been the tendency of the randomness of atoms in the system, and the enthalpy has been the energy of the system.
With the spontaneous reaction, there has been an increase in the entropy of the system with the formation of the products, and a decrease in the enthalpy. The reaction forms no use of the input energy, and thereby cannot be endothermic in nature.
Therefore, the reaction that is exothermic tends to be spontaneous reactions. Hence, option B is correct.
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Does iron always have a charge of 2+ when it forms an ion
Answer:
Roman numeral notation indicates charge of ion when element commonly forms more than one ion. For example, iron(II) has a 2+ charge; iron(III) a 3+ charge.
Explanation:
How many atoms are in a sample containing 4.000 moles of carbon?
A)6.022 x 10
23
atoms
B)2.408 x 10
24
atoms
O
24
C)7.233 x 10 atoms
D)2.893 x 10
25
atoms
Answer:
c I think but that's only what i think
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 24.088×10²³ atoms of carbon are in sample containing 4.000 moles of carbon. The correct option is option B.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically,
number of atoms/molecules/ formula units of carbon= number of moles of carbon × 6.022×10²³
number of moles of carbon= 4 moles
substituting all the given values in the above equation, we get
number of atoms/molecules/ formula units of carbon= 4 × 6.022×10²³
number of atoms/molecules/ formula units of carbon=2.4088×10²⁴ atoms of carbon
There are 2.4088×10²⁴ atoms of carbon
Therefore, 24.088×10²³ atoms of carbon are in sample containing 4.000 moles of carbon. The correct option is option B.
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An s orbital has how many orientations? Group of answer choices
Answer:
One orientation
Explanation:
A s orbital is a sphere like shape that surrounds the atomic nucleus that consists of electrons that can be found at the highest or lowest region of the orbital. S orbitals only consist of "one orientation" and is commonly mistaken by the p orbital because the p orbital also consists of electrons that can be found the most.
Hope this helps.
in which type of bond are electron shared between atoms?
A. ionic
B.covalent
C.metallic
Throughout the reflection, make sure you have a copy of the Student Guide and your data tables. Complete the paragraph by using the drop-down menus.
In this lab, you modeled and observed the three main ways thermal energy is transferred. When thermal energy transfers from a warmer body or place to a cooler body or place, it is referred to as heat.
------ involves the transfer of heat between two bodies that are touching, ------
is the transfer of heat in a liquid or gas, and -----
is the transfer of heat through space.
Answer:
Conduction, Convection, and Radiation
Explanation:
I got it right on Edge 2021
the The fill in the blanks should be filled with Conduction, Convection, and Radiation
information regarding heat:
Conduction should include the transfer of heat that lies between the two bodies that could be touched. Convection refers to the transfer of gas that could be in the form of gas or liquid. The radiation should be the transfer of heat via space.learn more about heat here: https://brainly.com/question/994316?referrer=searchResults
1. (solution/solvent/solute) Use the correct word in the following sentence:
dissolved in
makes up a
2 What is the difference between a strong electrolyte and a weak electrolyte?
3. The solubility of sodium chlorate in water is 52g/100g H20. If 0.46 moles of sodium
chlorate are dissolved in 60g of water, is this solution
saturated/supersaturated/unsaturated?
Answer:
1. solute dissolved in solvent makes up a solution.