Answer:
PVC is a versatile material that offers many possible applications, these include; window frames, drainage pipe, water service pipe, medical devices, blood storage bags, cable and wire insulation, resilient flooring, roofing membranes, stationary, automotive interiors and seat coverings, fashion and footwear, packaging .
Explanation:
Sequence Examine the periodic table.
Which four pairs of elements would be
reversed in order if the elements were
listed by increasing atomic mass instead of
increasing atomic number?
Answer:
Notice that tellurium is listed before iodine even though its atomic mass is higher. Mendeleev reversed the order because he knew that the properties of iodine were much more similar to those of fluorine (F), chlorine (Cl), and bromine (Br) than they were to oxygen (O), sulfur (S), and selenium (Se).
The tellurium is listed before iodine even though its atomic mass is higher. Mendeleev reversed the order because he knew that the properties of iodine were much more similar to those of fluorine (F), chlorine (Cl), and bromine (Br) than they were to oxygen (O), sulfur (S), and selenium (Se).
What things are in the periodic table?The periodic table is a tabular Form of the chemical elements classified by atomic number, from the element with the least atomic number, hydrogen, to the element with the most atomic number.
The atomic number is the number of protons in the nucleus of an atom.
Thus, The tellurium is listed before iodine even though its atomic mass is higher. Mendeleev reversed the order because of its properties.
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Cho hai điện tích q1 = 2. 10-6 C, q2 = 4. 10-6 C, đặt tại A và B trong không khí biết AB = 2 cm. Xác định vectơ cường độ điện trường tại:
a) H, là trung điểm của AB.
b) . M, MA = 1 cm, MB = 3 cm.
c) N, biết rằng NAB là một tam giác đều.
Answer:
[tex]2.10 - 6 \: c q2 = 4.10 - 6.c[/tex]
Is both CALCIUM HYPYCHLORIDE & CALCIUM OXYCHLORIDE same?
I really need the chemical name of Bleaching powder
PLSSSSS HELP/......
Will mark Brainliest.......
Answer:
Yes they are..... Both are the names of the same thing
carbon-carbon covalent bonds, such as the ones in carbohydrates and lipids, are _____ and have _____.
Answer:
Weak; a lot of potential energy.
Explanation:
Carbon-carbon covalent bonds, such as the ones in carbohydrates and lipids, are weak and have potential energy.
What is covalent bond?In chemistry, a covalent bond is a chemical connection between two ions or atoms in which their respective electron pairs are shared. A molecular bond is another name for a covalent link.
Several other chemical species, including radicals and macromolecules, may also include this kind of connection. Irving Langmuir invented the term "covalence" around 1919 to characterize the quantity of electron pairs exchanged by nearby atoms, but the phrase "covalent bond" wasn't used until 1939. Carbon-carbon covalent bonds, such as the ones in carbohydrates and lipids, are weak and have potential energy.
Therefore, carbon-carbon covalent bonds, such as the ones in carbohydrates and lipids, are weak and have potential energy.
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What happened to the colored water and to the paper ambot after poking the plastic covering the glass? ( experiment current affairs) guyss pls help me.
Answer:
ok ok ok ok ok ok ok ok ok ok ok ok ok ikjk
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Explanation:
fgghhh
why can you find different features at an oceanic-continental convergent zone than those found at a continental-continental convergent zone?
When a cold air mass crashes into a warm air mass, which kind of front is formed?
Answer:
Occluded front
Explanation:
An occluded front usually forms around a low pressure system. The occlusion starts when a cold front catches up to a warm front. The air masses, in order from front to back, are cold, warm, and then cold again. Coriolis Effect curves the boundary where the two fronts meet towards the pole.
What is the definition of a covalent bond?
1. A bond between two positive ions
2. A bond between a positive and a negative ion
3. A bond between two negative ions
4. A bond between two atoms
Answer:
4. A bond between two atomsExplanation:
A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. These electrons are simultaneously attracted by the two atomic nuclei. A covalent bond forms when the difference between the electronegativities of two atoms is too small for an electron transfer to occur to form ions.
What is the difference between concrete and cement?
Answer:
cement is actually an ingredient of concrete. Concrete is a mixture of aggregates and paste. ... Cement comprises from 10 to 15 percent of the concrete mix, by volume.
What is "a sea of electrons"
Answer:
In metallic bonds, the valence electrons from the s and p orbitals of the interacting metal atoms delocalize. That is to say, instead of orbiting their respective metal atoms, they form a “sea” of electrons that surrounds the positively charged atomic nuclei of the interacting metal ions.
Calcium carbonate, Caco is able to remove sulfur dioxide, SO, from waste gases by a reaction in
which they react in a 1:1 stoichiometric ratio to form equimolar amounts of Caso, When 255 gof
CAC, reacted with 135 g of So, 198 g of caso, were formed. Determine the percentage yield of Caso3
Answer: Detailed problem with lots of assumptions. Please see below. Percent yield is 100% (!?, so check my work).
Explanation:
Some information is missing from the problem statement. I'll make some assumptions to solve the problem, so this answer depends on those assumptions.
"Calcium carbobnate" is CaCO3, not CaCO, which is obtained by calcining (heating) CaCO3:
CaCO3 = CaO + CO2
The CaO can then be reacted with SO2 to form calcium sulfate, CaSO4 (not CaSO, as per the following balanced equation:
2CaO + 2SO2 + O2 = CaSO4
[Note: It also reacts with any SO3 molecules bouncing around, as does happen in flue gases to also form CaSO4]
The following assumes we have 255 grams of CaCO3, not CAC, whatever that stands for.
We have 135g of SO2, not SO.
This also assumes that it is CaSO4 that is produced (not CaSO), 198 grams.
Since is a two step reaction sequence, we need to first calculate the moles of Ca) produced from the CaCO3. It is a 1:1 molar ratio, and we have (255g/100.1g/mole) = 2.548 moles of CaCO3. This will produce 2.548 moles of CaO, for use in the second reaction.
2CaO + 2SO2 + O2 = 2CaSO4
This tells us we'll produce 1 mole of CaSO4 for every 2 moles of CaO, a 1:2 ratio. It also states that 2 moles of SO2 are consumed for every 2 moles CaO, a 1:1 ratio.
We have 2.548 moles of CaO, so would need the same moles of SO2 to fully react. However, we only have (135g/64.1 g/mole) = 2.107 moles of SO2. The SO2 will be the limiting reagent, so the theorectical yield will be based on this reactant, which will consume 2.107 moles of CaO, leaving 0.44 moles (24.7 g) of CaO behind.
The balanced equation tells us that 2.107 moles of CaO should produce 2.107 moles of CaSO4, which is (2.107moles)*(136.1 g/mole) = 198 grams of CaSO4. We actually got 198 grams, so the yield is 100% [Nice work].
How do you determine the number of electrons?Question 4 options:It is equal to the protons + the atomic numberIt is the atomic mass + the atomic numberIt is equal to the protons in a neutral atomIt is equal to the atomic mass
Answer:
3rd answer - It is equal to the protons in a neutral atom.
Explanation:
Always,
No. of protons = No. of electrons
Therefore, we can conclude that the answer is the 3rd answer.
In the system model, the direction of the
arrow tells you that
Answer: Answer b
Explanation:
(BRAINLIEST FOR CORRECT ANSWER) How does the particle structure of a solid affect its shape, volume, and compressibility?
Answer:
A solid's particles fit closely together. The forces between the particles are so strong that the particles can not move freely; they can only vibrate. This causes a solid to be a stable, non-compressible shape with a definite volume.
Explanation:
I honestly don't know if that's right...
Why do certain Snurfles not survive?
The faster the particles, the
______ the temperature.
Less forceful
Slower
Higher
Lower
Answer:
When for example, heating up an ice cube the particles of the ice start to vibrate fast enough to get separated into liquid caused from high temperature. So the answer is Higher.
What is the balanced chemical equation for the combustion of iron
Answer:
iron + oxygen → iron oxide. 4 Fe + 3 O2 → 2 Fe2O.
Please show work for these
Answer:
yes
Explanation:
yes I am genius yygggh
*
Identify the element found in the f-block.
Cm
K
W
Br
Ag
How many moles of sodium chloride are in a 321.8 g sample?
Answer:
One mol of NaCl (6.02 x1023 formulas) has a mass of 58.44 g.
The number of moles of sodium chloride in a 321.8 g sample is 5.5 moles. Details about number of moles can be found below.
How to calculate number of moles?The number of moles of a substance in a particular mass of that compound can be calculated as follows:
no of moles = mass ÷ molar mass
molar mass of NaCl = 58.5g/mol
No of moles of sodium chloride = 321.8g ÷ 58.5g/mol
no of moles = 5.5 moles
Therefore, the number of moles of sodium chloride in a 321.8 g sample is 5.5 moles.
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The word "polar" means that the air mass is __________. *
A. warm
B. cold
C. lukewarm
D. stable
Answer:
cold
Explanation:
Weather is created by the movement and interaction of air masses of different temperatures. ... Air masses are commonly classified according to four basic source regions with respect to latitude. These are Polar (cold), Arctic (very cold).
What is Protein coat
Answer: virology) A coat of proteins surrounding the nucleic acid of a virus. Supplement. The protein coat is made up of protein subunits called capsomere. Additional layer of lipid molecules may envelope the protein coat.
Explanation:
what makes viruses so dangerous and vaccines so importent
Answer:
they are very dangerous.
Explanation:
they cause disease in humans, animals, crops, and can cause permanent damage to immune systems.
Answer:
viruses can shut your immune system and infect blood cells thus killing you. vaccines will provent this by prepering your immune system so when you get said virus, it will reduce your chance of death
Explanation:
im not smart with health but i hope this is correct!
Calculate the wavelength (m) of light that has a frequency of 2.17 × 10^11 s-1
a) 1.38*10^-3
b) 6.51*10^19
c) 1.44*10^-22
d) 1.44*10^22
e) 1.38*10^3
f) none of the above
Answer:
e
Explanation:
wavelength = speed of light/frequency
wavelength = 3 x 10^8/2.17 x 10^11
wavelength = 1.38x10^-3m
giúp mik giải hoá vs mik đag cần gấp
Answer: với những bài không biết bảo toàn e thì bạn có thể dùng bảo toàn nguyên tố cũng được, với pt hữu cơ thì ưu tiên cân bằng C, H trước rồi tới O
Explanation:
If the electron is more attracted to the nucleus why does that mean the IE is greater
Answer:The bigger the atom the lesser the ability of the atom to hold on to its valence electrons.
Explanation:
The larger the atom, the lesser the tendency for the atom to withhold its valence electrons.
The size of an atom is usually estimated in terms of its atomic radius. Across the period in the periodic table, the atomic radius decreases progressively from left to right. This is due to the progressive increase in the nuclear charge (i.e., the number of protons in the nucleus) without an attendant increase in the number of electron shells.
Similarly, down the group, the atomic radius increases progressively from top to bottom due to the successive number of electrons' shells.
Thus, the larger the atom's radius, the smaller the Ionization energy because of the increasing shielding effect of inner shell electrons on the electron to be removed from the nuclear attraction.
Finally, we can conclude that as the atom becomes larger, the tendency to withhold the electrons on the outer shell decreases due to distance and the shielding/ screening effect.
Magnesium reacts with hydrochloric acid to form hydrogen gas according to the equation below. If sufficient hydrochloric acid is used to react completely with 72.9 g of magnesium, calculate how many moles of hydrogen gas (H2) will be produced. Use the stoichiometry road map to first convert the mass of Mg into moles of Mg
3 moles of hydrogen gas (H2) will be produced If sufficient hydrochloric acid is used to react completely with 72.9 g of magnesium.
The chemical reaction described in the question is represented in the following equation:Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)According to this equation, 1 mole of magnesium produces 1 mol of hydrogen gas. First, we convert 72.9g of Mg to moles using the following formula:moles of Mg = 72.9g ÷ 24.3g/molmoles of Mg = 3 molIf 1 mole of magnesium produces 1 mol of hydrogen gas. Therefore, 3 moles of Mg will produce 3 moles of hydrogen gas.Learn more: https://brainly.com/question/14919968?referrer=searchResults
Balance the equation H2SO4+NaOH = H2O+NaSO4
Answer: H2SO4 + 2NaOH = Na2SO4 2H2O
Explanation: The ChemicalAid website is very helpful if you need to balance chemical equations.
the average single and double n-o bond lengths are 136 pm and 122 pm, respectively. assuming these two structures were to make equal contributions to the observed bonding in hno2, predict the n–o bond length.
Resonance structures show that chemical species have equal bond lengths and bond angles when in resonance. The bond lengths of the N - O bond in HNO2 is 126pm.
Linus Pauling introduced the idea of resonance to explain the nature of bonding in compounds and ions where a single Lewis structure can not satisfactorily account for the observed properties of the chemical species.
If the two structures are resonance structures, they will have equal N - O bond lengths and bond angles. The bond length will be intermediate between that of a pure N - O single and N - O double bond. The actual N- O bond lengths in HNO2 are obtained as; 136 pm - 122 pm/2 = 126 pm.
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jelani and Mikah are watching an approaching storm from their living room window. All of a sudden they see a bright flash of lightning that is soon followed by clap of thunder. what causes lightning? describe each step involved in the forming of lightning and give an example of a simile process from every day life
Answer: Heat causes surrounding air to rapidly expand and vibrate, which creates the pealing thunder we hear a short time after seeing a lightning flash.
A accumulation of static charge inside a storm cloud causes lightning.
What is lightning?Lightning is a massive electrical discharge that originates in the atmosphere between clouds, the air, or the earth.
In a rain cloud, lightning begins as static charges.
At the peak of the cloud, lighter, positively charged particles form. The cloud's heavier, negatively charged particles settle to the bottom. A massive spark, or lightning, develops between the two charges within the cloud when the positive and negative charges get large enough.
Step involved in the forming of lightning:
The collision of water droplets with ice crystals in the upper atmosphere occurs due to the rapid rise of the air. These collisions generate static electricity, which charges the clouds. Huge sparking occurs between the clouds or between the clouds and the ground as a result of this. This is referred to as lightning.
Example, Nylon clothes
Static electricity is produced when nylon clothing is rubbed against another fabric or against the wearer's skin.
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