Answer:
Things made of thermoplastics
1) Plastic chairs
2) Plastic table
3) Plastic cups and plates
4) Nylon bags
5) Plastic cabinet
6) PVC pipes-
7) Internal electronic component such as gears
8) Vehicle dashboard
Things made of Thermosetting plastics
1) Electrical insulation
2) Handles of electrical fittings
3) Plastic hoses
4) Electric switch covering
5) Coverings of electronic gadgets
6) Silicone in adhesives
7) Keyboard
Explanation:
A plastic polymer material that becomes soft upon heating and hard once again when cooled such that the material can be repeatedly or cyclically cooled and heated numerous times with its chemical and physical properties remaining constant is known as a thermoplastic.
A plastic, polymer or resin that is hardened from its soft or liquid state by curing irreversibly such that it cannot be made soft again without a change in its chemical properties is known as a thermosetting plastic.
5. How many atoms and molecules of sulphur are present in 64.0 g of sulphur (S 8 )?
Answer:
There are [tex]1.202\times 10^{24}[/tex] atoms and [tex]1.502\times 10^{23}[/tex] molecules in the compound.
Explanation:
The molar mass of the sulphur is [tex]32.065\,\frac{g}{mol}[/tex]. The Avogradro's Law states that exists [tex]6.022\times 10^{23}\,\frac{atom}{mol}[/tex]. The quantity of atoms in a quantity of mass is derived from dividing the mass by the molar mass and multiplying it by the Avogadro's Number. That is:
[tex]n_{atom} = m_{S}\cdot \frac{n_{A}}{M_{S}}[/tex]
Where:
[tex]m_{S}[/tex] - Mass of the sample, measured in grams.
[tex]n_{A}[/tex] - Avogadro's Number, measured in atoms per mole.
[tex]M_{S}[/tex] - Molar mass of the sulphur, measured in grams per mole.
If [tex]m_{S} = 64\,g[/tex], [tex]n_{A} = 6.022\times 10^{23}\,\frac{atoms}{mol}[/tex] and [tex]M_{S} = 32.065\,\frac{g}{mol}[/tex], then:
[tex]n_{atom} = (64\,g)\cdot \left(\frac{6.022\times 10^{23}\,\frac{atoms}{mol} }{32.065\,\frac{g}{mol} }\right)[/tex]
[tex]n_{atom} = 1.202\times 10^{24}\,atoms[/tex]
There are [tex]1.202\times 10^{24}[/tex] atoms in the compound.
Now, the molecular weight of the compound is:
[tex]M_{S_{8}} = 8\cdot \left(32.065\,\frac{g}{mol} \right)[/tex]
[tex]M_{S_{8}} = 256.52\,\frac{g}{mol}[/tex]
The quantity of molecules in a quantity of mass is derived from dividing the mass by the molecular weight and multiplying it by the Avogadro's Number. That is:
[tex]n_{molecule} = m_{S_{8}}\cdot \frac{n_{A}}{M_{S_{8}}}[/tex]
Where:
[tex]m_{S_{8}}[/tex] - Mass of the sample, measured in grams.
[tex]n_{A}[/tex] - Avogadro's Number, measured in atoms per mole.
[tex]M_{S_{8}}[/tex] - Molecular weight of the compound (octosulphur), measured in grams per mole.
If [tex]m_{S_{8}} = 64\,g[/tex], [tex]n_{A} = 6.022\times 10^{23}\,\frac{molecules}{mol}[/tex] and [tex]M_{S_{8}} = 256.52\,\frac{g}{mol}[/tex], then:
[tex]n_{molecule} = (64\,g)\cdot \left(\frac{6.022\times 10^{23}\,\frac{molecules}{mol} }{256.52\,\frac{g}{mol} }\right)[/tex]
[tex]n_{molecule} = 1.502\times 10^{23}\,molecules[/tex]
There are [tex]1.502\times 10^{23}[/tex] molecules in the compound.
According to the law of conservation of energy, what will most likely happen in a closed system?
O Energy will be exchanged along with matter.
Energy will be exchanged, but matter will not be exchanged.
Energy will be created along with matter.
Energy will be destroyed, but matter will not be destroyed.
Answer:
the answer is Energy will be exchanged, but matter will not be exchanged.
this because that in a closed system energy is able to be transfered but matter cant.
hope this helps
Answer:
b
Explanation:
none
Hydrogen + Nitrogen
Ammonia
Answer:
Ammonia, NH3, is a chemical compound composed of one nitrogen atom and three hydrogen atoms.
Explanation:
i hope this will help you :)
Answer:
3H2 + N2 ---> 2NH3
Explanation:
3H2 + N2 ---> 2NH3
Hydrogen + Nitrogen Ammonia
What marine province contains deep ocean trenches that form along convergent plate boundaries as a result of subduction?
A. Mid-ocean ridge
B. Deep ocean basin
C. Abyssal plain
. Continental margin
Answer:
A.Mid ocean ridge i think
Explanation:
your answer is B my guy
How many significant digits will the answer in the following calculations result in?
12.1 - 12.004
Answer:
The answer will result in one significant digit.
Explanation:
1. Subtract:
12.1 - 12.004 = 0.096
2. ROund to the correct number of significant digits:
For addition and subtraction we round the sum or the difference to the least number of digits after the decimal point there are in the problem.
For example, SInce 12.1 has one number after the decimal point and 12.004 has three numbers after the decimal point, we round the answer to one number after the decimal point because 12.1 is the number in the problem which has the least amount of digits after the decimal point.
We round 0.096 to 0.1.
0.1 has one significant digit.
The quantum numbers of six electrons are given bellow .Arrange them in order to increasing energies. (a) n= 4,l =2, m= -2, s= -1/2 (b) n=3, l=2, m=1, s=+1/2 © n=4, l=1, m = 0, s=+1/2 (d) n=3, l=2, m= -2, s= -1/2 (e) n=3,l=1, m = -1, s =+1/2 (f) n=4, l=1, m=0, s = +1/2
Answer:
e< d< b< c=f< a
Explanation:
Quantum numbers refers to values that exactly describe the energy of electrons within an atom or a molecule. Electrons are known to possess a set of four quantum numbers used in describing the energy state of such electron. These quantum numbers are solutions to the Schrödinger wave equation for the hydrogen atom.
In describing any electron within the atom, the relevant set of four quantum numbers are: principal quantum number (n), orbital, azimuthal, subsidiary or angular momentum quantum number (l), magnetic quantum number (ml), and spin quantum number (ms).
In the arrangement above, the electrons are arranged in order of increasing energy. Each arrangement of quantum numbers corresponds to a particular energy state of the electron.
Dr. Tate and Dr. Ramirez are observing the effects of a type of solar activity that has reached the planet Jupiter. What solar activity are they observing? a.solar flares b.sunspots c.prominences d. solar winds
Answer:
d. solar winds
Explanation:
Dr. Tate and Dr. Ramirez are observing solar winds coming from the sun. Solar winds occurs naturally in which the particles such as electrons and photons releases from the surface of the sun into the space. These solar winds moves in the solar system and interact with planets of the solar system. Dr. Tate and Dr. Ramirez are the two well known scientist observing the effects of solar winds that has reached the planet Jupiter.
Fredo’s spaceship takes him to the very edge of known space. There, gravity has no effect at all. Fredo takes a baseball and tosses it into space. What will most likely happen to the ball? It will not move at all. It will return to Fredo’s spaceship. It will eventually stop moving. It will continue moving in a straight line.
Answer:
D. It will continue moving in a straight line.
Explanation:
When Fredo takes a ball and tosses it into space, the ball will move upward infinitely.
Gravity is the downward force that acts on an object.
Without gravity, or without the effect of gravity, an object will continue to move in its path with the original direction applied to it.
Answer:
D
Explanation:
I took the test
You are on an island and need freshwater to drink. Which process could you
use to separate the salt from ocean water and provide freshwater for
drinking?
O A. Distillation
B. Chromatography
C. Filtering
O D. Freezing
Answer:
A
Explanation:
The reason it is distillation is due to the fact that we can use distillation to heat the ocean water. As water has a lower boiling point than the salt solution, it evaporates and the salt stays behind.
The solubility of Z is 60 g/ 100 g water at 20 °C. How many grams of solution are produced when a saturated solution is prepared using 300 grams of water at the same temperature? a 240 b 180 c 120 d 480
Answer:
Saturated solution = 180 gram
Explanation:
Given:
Solubility of Z = 60 g / 100 g water
Given temperature = 20°C
Amount of water = 300 grams
Find:
Saturated solution
Computation:
Saturated solution = [Solubility of Z] × Amount of water
Saturated solution = [60 g / 100 g] × 300 grams
Saturated solution = [0.6] × 300 grams
Saturated solution = 180 gram
¿A qué grupo pertenecen los átomos de Z = 8, Z= 36 y Z=39? ¿Cuántas capas de electrones tiene cada uno? ¿Cuántos electrones harían falta para llenar la capa más externa?
Answer:
Mira la explicación.
Explanation:
¡Hola!
En este caso, podemos encontrar facilmente el grupo al que pertenecen dichos elementos con números atómicos 8, 36 y 39 respectivamente mediante su búsqueda en la tabla periódica. Así, z=8 corresponde a oxígeno, z=36 a kriptón y z=39 a itrio.
Por otro lado, para saber el número de capas, debemos desarrollar la configuración electrónica para cada uno:
[tex]O: 1s^2,2s^2,2p^4\\Kr: 1s^2,2s^2,2p^6,3s^2,3p^6,4s^2,3d^{10},4p^6\\Y:1s^2,2s^2,2p^6,3s^2,3p^6,4s^2,3d^{10},4p^6,5s^2,4d^1[/tex]
Con esto, vemos que oxígeno tiene dos capas, kripton cuatro capas e iritrio cinco, a lo que a oxígeno le faltan dos electrones para llenar dicha capa, a kripton ninguno y a iritrio nueve.
Saludos.
Hg(OH)2 + H3PO4 = Hg3(PO4)2 + H2O
Answer:
3Hg(OH)2 + 2H3PO4 → Hg3(PO4)2 + 6H2O
Question: Which is the best analogy for classification? A.Classification is like setting up a phone tree in which one person calls the next two people, and those people call the next four people. B.Classification is like creating an alphabetized list of people based on their last names. C.Classification is like organizing a car wash where everyone brings needed items and then works. D.Classification is like organizing a closet by hanging clothes together based on their type, color, and season. *15 points cuz i'm low on points oof* *science NOT chemistry*
Answer:
The last one
Explanation:
When we are classifying we try to distinguish between the type, the properties just like clothes
What molecule can form hydrogen bonds with others like it A. CF4 B. HCL C. CO2 D. NH3
Answer:
D. NH3
Explanation:
Hydrogen bonding exists only between hydrogen atoms, and is one of the strongest intramolecular forces. So you eliminate your choices down to B and D. HCl can't form Hydrogen bonding because of electron density and electronegativity but NH3 can, so your answer would be D.
An aqueous solution of glucose (MM = 180.2 g/mol) has a molality of 2.27 m and a density of 1.20 g/mL. What is the molarity of glucose in the solution?
**Any help would be greatly appreciated!**
Answer:
Molarity of the glucose solution = 2.72 mol/L
Explanation:
Molality of a solution is defined as the number of moles of solute per kilogram of solvent.
Therefore , a 2.27 molal solution of glucose contains 2.27 moles of glucose in 1 Kg of solvent
Density of solution = 1.20 g/mL
The volume occupied by 1 Kg or 1000 g solution = mass/density
Volume of 1000 g solution = 1000 g/1.20 g/ml = 833.3 mL
Number of moles of glucose present in the solution = 2.27 moles
Molarity = number of moles / volume(L)
volume of solution in litres = 883.3/1000 = 0.8333 L
Molarity = 2.27 moles /0.8333 l = 2.72 mol/L
Therefore, molarity of the glucose solution = 2.72 mol/L
The molarity of the glucose in the solution has been 2.72 mol/L.
Molality can be defined as the moles of the solute per kg of solvent.
The molality of glucose solution = 2.27 m
2.27 moles of glucose in 1000 grams of water.
Density has been the mass per unit volume. The density can be expressed as:
Density = [tex]\rm \dfrac{Mass}{Volume}[/tex]
The density of the given glucose solution = 1.20 g/ml
The volume of 1000 grams of water has been:
Volume = [tex]\rm \dfrac{Mass}{Density}[/tex]
Volume of 1000 grams water = [tex]\rm \dfrac{1000\;g}{1.20\;g/ml}[/tex]
Volume of 1000 g water = 833.3 ml
The molarity can be defined as the mass of solute per liter of the solution.
Molarity = [tex]\rm moles\;\times\;\dfrac{1000}{Volume\;(ml)}[/tex] ......(i)
The moles of glucose in the 833.3 ml solution have been 2.27 mol.
Substituting the values in equation (i):
Molarity = 2.27 mol [tex]\rm \times\;\dfrac{1000}{833.3\;ml}[/tex]
Molarity = 2.72 mol/L.
The molarity of the glucose in the solution has been 2.72 mol/L.
For more information about the molarity of the solution, refer to the link:
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1 Cup of Boiling Water
WAPHS Swimming Pool
(100 °C)
or
(25 °C)
• What is the difference between thermal energy and
temperature?
aterials
Enosh
Odates
ades
stery
endance
mbers
• The boiling water has a much higher temperature... What
does that mean?
nferences
enuity Ele
enuity se
sela
• Which has more thermal energy? Why?
Note Cla
Learnir
9
1 Mop
Answer:
Side photo
A small still is separating propane and butane at 135 °C, and initially contains 10 kg moles of a mixture whose composition is x = 0.3 (x = mole fraction butane). Additional mixture (x = 0.3) is fed at the rate of 5 kg mole/hr. The total volume of the liquid in the still is constant, and the concentration of the vapor from the still (xp) is related to x, as follows: Xp = How long will it take for X, to change from 0.3 to 0.35.
Answer: A swimming pool at 40°C is at a lower temperature than a cup of tea at 90°C. However, the swimming pool contains a lot more water. Therefore, the pool has more thermal energy than the cup of tea even though the tea is hotter than the water in the pool.
Explanation: Heat and Temperature do not mean the same thing. ... A swimming pool at 40°C is at a lower temperature than a cup of tea at 90°C. However, the swimming pool contains a lot more water. Therefore, the pool has more thermal energy than the cup of tea even though the tea is hotter than the water in the pool.
Which is a negative effect of deforestation on the environment? habitat restoration, desertification, soil production, or urbanization
Answer:
The correct option is desertification
Explanation:
Deforestation is the deliberate act of pulling down trees to provide a clear land for space or to make use of the trees for other purposes such as grazing, farming, timber fire wood, building and constructions, urban utilization, access roads, expansion, development of infrastructures, grazing of cattle and mining
The effects of deforestation includes climate change, flooding, increase in the proportion of green house gases in the atmosphere, soil erosion and desertification.
A negative effect of deforestation is desertification.
Deforestation refers to the cutting down of trees. There are many reasons why people may cut down trees. One of the popular reasons why people cut down trees is to obtain timber which is used for construction and as fuel.
An important consequence of the felling of trees also called deforestation is that a once fertile land may gradually be turned into a desert area. This is known as desertification.
Learn more: https://brainly.com/question/8330332
Which example is a long-term environmental change? La Niña El Niño climate change small asteroid impact
The correct answer is C. Climate change
Explanation:
Long-term environmental changes occur as major events affect the environment and ecosystems indefinitely. These events differ from short-term environmental changes because the effect of short-term environmental changes is mainly temporary. Also, long-term changes are usually gradual.
Climate change is an example of long-term environmental changes because this implies indefinite and major changes in weather patterns and ecosystems. For example, it is believed climate change will decrease the amount of ice in Earth, change sea level, and lead to the extinction of dozens of species. This does not occur with events such as el niño or a small asteroid impact that affect the environment for a short time and do not imply major changes.
Answer:
it is c) climate change
Explanation:
i just took the quiz
hope this helps!!! :D
For question numbers 1 and 2, two statements are given - one labelled
Answer to these questions from the codes (i), (ii), (ub and (iv) as given
Both (A) and (R) are true and (R) is correct explanation of the
assertion (A).
(ii)
Both (A) and (R) are true, but (R) is not the correct explanation of
the assertion (A).
(iii)
(A) is true, but (R) is false.
(iv) (A) is false, but (R) is true.
Assertion (A) : Carbon has a strong tendency to either lose or gain
electrons to attain noble gas configuration.
Reason (R):
Carbon has four electrons in its outermost shell and has
the tendency to share electrons with carbon or other
elements.
Assertion (A) and the other labelled Reason (R). Select the correct
Answer:
(iv) (A) is false, but (R) is true.
Explanation:
It is not true that carbon has a strong tendency to either lose or gain electrons to attain noble gas configuration. Carbon is a member of group 14, it is the first member of the group and carbon is purely a non metal. Only metals metals can loose electrons to attain the noble gas configuration. Moreover, carbon does not participate in ionic bonding so it does not gain electrons to attain the noble gas configuration.
However, carbon participates in covalent bonding where it is covalently bonded to four other chemical species using its four outermost electrons. Carbon forms covalent bonds in which four electrons are shared with other chemical species.
how many moles of water (H2O) would be produced from the reaction of 3.25 moles of hydrochloric acid (HCL) reacting with excess calcium hydroxide (Ca(OH)2)
Answer:
3.25 moles of H2O
Explanation:
We'll begin by writing the balanced equation for the reaction. This is given below:
2HCl + Ca(OH)2 —> CaCl2 +2H2O
Now, we can obtain the number of mole H2O produced from the reaction as follow:
From the balanced equation above,
2 moles of HCl reacted to produce 2 moles of H2O.
Therefore, 3.25 moles of HCl will also react to produce 3.25 moles of H2O.
Therefore, 3.25 moles of H2O were produced from the reaction.
Boiling point of water at 750 mmHg is 99.63⁰C. How much sucrose is to be added to 500 g of water such that it boils at 100⁰C. Kb for water 0.52 K Kg mol-1
Answer:
121.67 g is to be added to 500 g of water
Explanation:
Given that:
Pressure = 750 mmHg
Temperature T₁= 99.63⁰C = (273 + 99.63 ) = 372.63K
mass of water = 500 g
Temperature T₂ = 100⁰C = ( 273 + 100) K = 373 K
where;
Kb for water 0.52 K Kg mol-1
For sucrose; C₁₂ H₂₂ O₁₁
Molar mass = ( 12 × 12 )+ ( 1 × 22 ) + ( 16 × 11 )
Molar mass = 342 g/mol
ΔT = T₂ - T₁
ΔT = (373 - 372.63)K
ΔT = 0.37 K
∴ the amount of sucrose to be added to 500 g of water is:
[tex]= \dfrac{0.37\times 342 \times 500}{0.52 \times 1000 }[/tex]
[tex]= \dfrac{6327}{52}[/tex]
= 121.67 g
Thus; 121.67 g is to be added to 500 g of water
The image is of the formation of a fault-block mountain.
Which of these most likely occurs to result in the
formation of these mountains?
O The crust is compressed
O The crust does not spread apart
The center block is forced upward.
The hanging walls from the two parallel faults slip down
Answer:
d.
Explanation:
The Formation of these mountains will be caused by
The crust does not spread apartThe center block is forced upward.The hanging walls from the two parallel faults slip downOptions B, C, and D is correct.
What are mountains?Generally, a mountain is simply defined as a body that rises dramatically above its surroundings and is distinguished by steep slopes.
In conclusion, Mountains are formed from the formation of rocks over years in an Environment.
Read more about Environment
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Which statement describes the role of a mitochondrion in providing a body with energy? It stores glucose that is taken from food so that respiration can happen later. It combines blood and oxygen so that energy can be released from glucose. It is the site where oxygen combines with small molecules and releases large amounts of energy. It is the site where food is broken down into small molecules and amounts of energy .
Answer:
It is the site where oxygen combines with small molecules of glucose and releases large amounts of energy
Explanation:
If you have a volume of 10 mL and a mass of 100 kg, what is the density?
10. Write the word equation of the following skeleton equation.
CuCl(aq) + NaOH(aq) → Cu(OH),(s) + NaCl(aq)
Indicate the state of each substance in your word equation.
Someone help me out please
Answer:
See below.
Explanation:
Aqueous copper chloride reacts with sodium hydroxide aqueous solution to give a precipitate (solid) of copper hydroxide and aqueous sodium chloride.
When a gas is put in a container it...
a. does not change shape.
b. fills up the container.
c. fills up the container and fills it up top to bottom.
Answer:
c.is the answer..not sure...but i think so
The density of a gaseous chlorofluorocarbon (CFC) at 23.8 °C and 432 mmHg is 3.23 g/L. What is its molar mass?
Answer:
138.57 g/mol.
Explanation:
The following data were obtained from the question:
Temperature (T) = 23.8 °C
Pressure = 432 mmHg
Density (D) = 3.23 g/L
Next, we shall obtain an expression for the density in relation to molar mass, pressure and temperature.
This can be obtained by using the ideal gas equation as shown below:
PV = nRT.... (1)
Recall:
Mole (n) = maas(m) /Molar mass (M)
n = m/M
Substituting the value of n into equation 1
PV = nRT
PV = mRT/M
Divide both side by P
V = mRT/MP
Divide both side by m
V/m = RT/MP
Invert the above equation
m/V = MP /RT..... (2)
Recall:
Density (D) = mass(m) /volume (V)
D = m/V
Replace m/V with D in equation 2
m/V = MP /RT
D = MP /RT
Thus, with the above formula we can obtain the molar mass of chlorofluorocarbon (CFC) as shown below:
Temperature (T) = 23.8 °C = 23.8 °C + 273 = 296.8 K
Pressure = 432 mmHg = 432/760 = 0.568 atm
Density (D) = 3.23 g/L
Gas constant (R) = 0.0821 atm.L/Kmol
Molar mass (M) =..?
D = MP /RT
3.23 = M x 0.568 / 0.0821 x 296.8
Cross multiply
M x 0.568 = 3.23 x 0.0821 x 296.8
Divide both side by 0.568
M = (3.23 x 0.0821 x 296.8) / 0.568
M = 138.57 g/mol
Therefore the molar mass of CFC is 138.57 g/mol.
skeleton equation for
when magnesium oxide reacts with iron, iron(III) oxide and magnesium is formed
Answer:
Magnesium oxide = MgO
Iron = Fe
Iron (III) Oxide = Fe₂O₃
Magnesium = Mg
Skeleton equation = MgO + Fe ⇒ Fe₂O₃ + Mg
Valency of Chlorine is 1. Why?
Answer:
Valency of Chlorine is 1 because it needs 1 electron to complete its octet (a shell of eight electrons). Valency is defined as "The combining power of an element" and Since, chlorine needs 1 electron to complete its valence shell, Its valency is 1.
In Act V, scene ii of Romeo and Juliet, what role does Friar John play in the catastrophe?
He creates a quarantine, which impacts Romeo.
He secretly performs Romeo and Juliet's wedding.
He mistakenly tells Balthasar that Juliet is dead.
He fails to deliver an important letter to Romeo.
Answer:
I believe its the 4th one. He goes to give Romeo the message but before he is able to, Balthasar tells Romeo that Juliet is dead. Friar John just wasn't there in time.
Answer:
D) he fails to give Romeo an important letter
Explanation:
i took the test. edge 2020