Answer:
a) There will be an increase in the glass transition temperature when the molecular weight increases. Based on Fox-Flory equation, with the increase in molecular weight, the transition temperature of glass also increases.
b) There will be a decrease in the glass transition temperature when the strength of the chain-chain bonding decrease as intermolecular force between the bonds reduces resulting in the decrease in the glass transition temperature.
c) There will be an increase in the glass transition temperature when the pressure increases as enhancement in pressure decreases the free volume in the surroundings and enhance the bond interaction resulting in the increase in the glass transition temperature.
i need this quickly please god bless u all
Can't see well , post again and ill make sure to help.
what element is 1s2 2s2 2p6 3s2 3p6 3d7 4s1
Answer:
The element is Iron
Explanation:
Fet2 and Fe3 are
valences
isotopes
ions
Molecules
Answer:
Ions.
Explanation:
Hello!
In this case, since iron is a metal which has lots of uses in the design of metallic alloys and materials, when it is at its ground state we say it is just Fe; however, since it is a metal, it is very likely to lose electrons and therefore getting positively charged as +2 or +3, say:
[tex]Fe^{2+}\\\\Fe^{3+}[/tex]
Thus, since they are positively charged, they are classified as cations, which are ions.
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In a series circuit there are 17 light bulbs, each providing 1 ohm of resistance. What is the total resistance?
5 ohms
1/17 ohms
34 ohms
17 ohms
Answer:
17 ohms
Explanation:
Given that,
In a series circuit there are 17 light bulbs, each providing 1 ohm of resistance.
We need to find the total resistance of the circuit.
The equivalent resistance for series combination is given by :
[tex]R_{eq}=R_1+R_2+....[/tex]
For 17 light bulbs, the equivalent resistance is given by :
[tex]R_{eq}=R+R+....\text{upto 17 terms}\\\\R_{eq}=17R\\\\=17[/tex]
Hence, the total resistance is 17 ohms. Hence, the correct option is (d).
Answer:
17 ohms
Explanation:
Hope it helps
All members of the alkene series of hydrocarbons have the general formula:
Select one:
a. CnH2n-2
b. CnH2n+2
C. CnHn
d. CnH2n
This is the picture answer this plsss..
Answer:
he is a weelder because of him taking a peice of metal and recreateing it.
Explanation:
example of a electrolytic cell we use in everyday life.
Answer: Important examples of electrolysis are the decomposition of water into hydrogen and oxygen, and bauxite into aluminium and other chemicals. Electroplating (e.g., of copper, silver, nickel or chromium) is done using an electrolytic cell. We encounter electrochemical cells in all facets of our everyday lives from the disposable AA batteries in our remote controls and the lithium-ion batteries in our iPhones to the nerve cells strewn throughout our bodies. There are two types of electrochemical cells: galvanic, also called Voltaic, and electrolytic.
Hope this helps....... Stay safe and have a Merry Christmas!!!!!!!!! :D
Disposable AA batteries can be the example of an electrolytic cell we use in everyday life.
What is electrolyte cell?An electrolytic cell is an electrochemical cell that forces a chemical reaction that wouldn't happen otherwise by using an external source of electrical energy.
Anode and cathode, which are submerged in an electrolyte solution, are the two electrodes that make up the cell and serve as the external energy source.
Electrolytes are necessary for basic bodily functions such producing and conducting action potentials in the nerves and muscles, and maintaining electrical neutrality in cells.
Along with magnesium, calcium, phosphate, and bicarbonates, sodium, potassium, and chloride are the important electrolytes.
From the throwaway AA batteries in our remote controls and the lithium-ion batteries in our iPhones to the nerve cells dispersed throughout our bodies, electrochemical cells are present in every aspect of our daily lives.
Thus, Disposable AA batteries are electrolyte cell used in daily life.
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Calcium chloride contains calcium and chloride ions. Write the ground-state electron configuration for the calcium ion.
Answer:
1s2 2s2 2p6 3s2 3p6
Explanation:
Calcium is the 20th element. It has 20 electrons in it's neutral state. The electronic configuration is given as;
1s2 2s2 2p6 3s2 3p6 4s2
However in the compound; calcium chloride, it does not exist in it's neutral state.
CaCl2 --> Ca2+ + Cl-
In Ca2+ state, it has lost two electrons, The total number of electrons becomes; 20 - 2 = 18 electrons.
The electronic configuration is given as;
1s2 2s2 2p6 3s2 3p6
7.02 x 10^23 molecules of X2, a ssubstance consisting of diatomic molecules, has a mass of 296 grams. Determine the atomic weight (mass of a mole of atoms) of element X.
a. 254 g/mol.
b. 296 g/mol.
c. 148 g/mol.
d. 127 g/mol.
e. 507 g/mol.
Answer:
d. 127 g/mol.
Explanation:
Hello!
In this case, since we have the amount of molecules of this this compound, we are able to compute the moles out there by using the Avogadro's number:
[tex]mol=7.02x10^{23}molec*\frac{1mol}{6.022x10^{23}molec}=1.17mol[/tex]
Which correspond to the moles of X2. Then, by using the mass we are able to compute the molar mass of X2:
[tex]MM=\frac{296g}{1.17mol}\\\\MM=254g/mol[/tex]
It means that the atomic mass of X halves the molar mass of X2, which is then d. 127 g/mol.
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If 312 grams of H2 is used, how many grams of water will be produced?
Answer:
32g O2 x 36.03056g H20/31.9988g O2 this way the O2 cancels out and you are left with just the H2O so your raw answer would be 36.0319112, then if your instructor requires a significant figure answer that would be to 2 significant figures the information you were given 32g O2, so as above 36g or Water are produced. Just a different way to view and solve the problem with the balanced equation so you can see the way everything relates to everything else. the molar masses of O2 and H2O are simply found my adding up 2 Oxygens 15.9994g x2 = 31.9988g and H2O = 2(1.00794) + 15.9994 = 18.01258 but you then have to multiply that by 2 because the reaction states you get 2 mols in the reaction so that is where I came up with the 36.03056g for the solution. Hope this helps. Dimensional Analysis is and can be one of the best ways to solve these problems, because not always are you going to be dealing with 1:2 ratios.
How will changing the water's initial temperature affect how much the water's
temperature increases when the cylinder is dropped?
14pts
It lowers the temperature. Because the water temperature drops as the mass of the cylinder increases, it will result in a cooler year.
What is the term temperature ?Temperature is a unit used to represent hotness or coolness on any of a number of scales, including Fahrenheit and Celsius.
Water molecules travel more swiftly as a function of temperature because each molecule gains energy as the temperature rises (according to Kinetic molecular theory).
When water is heated to a high enough temperature, the molecules move so much that the hydrogen bonds holding them together begin to dissolve, causing the water to turn into a gas.
Hence, the rise in temperature is always related to the mass of water. Thus, the final temperature will be lower if we increase the water mass. The temperature will be lower in the end.
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How many electrons does the copper atom lose in the process: Cu → Cu3+ + ? electrons
Answer:
3
Explanation:
used to release stored energy during
respiration
Answer:
Hope this helps D.
Explanation:
During cellular respiration, glucose is broken down in the presence of oxygen to produce carbon dioxide and water. Energy released during the reaction is captured by the energy-carrying molecule ATP (adenosine triphosphate).
what happens when you mix Mercury and Lead together?
Answer:
Lead forms an amalgam when filings are mixed with mercury and is also listed as a naturally occurring alloy called leadamalgam in the Nickel Strunz classification.
Explanation:
Brainliest please?
Why are subscripts used in an ionic bond?
Answer:
When are subscripts used in formulas for ionic compounds? When more than one of the ion is the simplest ratio of the ions. Describe a metallic bond. Each positive metal ion is attracted to delocalized valence electrons.
All members of the alkene series of hydrocarbons have the general formula:
Select one:
a. CnH2n-2
b. CnH2n+2
C. CnHn
d. CnH2n
CnH2n since the equivalent unsaturation is equal with 1
Which option is an example of a physical property?
flammability
solubility
reactivity
toxicity
Answer:
Solubility
Explanation:
Answer:
(B) Solubility
Explanation:
Suppose you analyze a 35.9 g sample of bleach and determine that there are 3.86 g of sodium hypochlorite present.What is the percent of sodium hypochlorite in the bleach sample?
Answer:
[tex]\%NaClO=10.8\%[/tex]
Explanation:
Hello!
In this case, since the percent of any substance into a mixture containing it, is computed by dividing the mass of the substance and the mass of the whole mixture, for 3.86 g of pure sodium hypochloride (bleach's active component) dissolved in 35.9 g of bleach, the percent turns out:
[tex]\%NaClO =\frac{3.86g}{35.9g}*100\%\\\\\%NaClO=10.8\%[/tex]
Best regards!
Question 1 (5 points)
Saved
image
If the hexagons in the picture are representative of glucose molecules, this is most likely a representation of which glucose polymer?
Question 1 options:
A)
Cellulose
B)
Starch
C)
Glycogen
D)
Dietary fiber
Question 2 (5 points)
After writing and balancing the equation, what's the next step in using bond energies to calculate the enthalpy of a reaction?
Question 2 options:
A)
Write down the bond energies for the products and reactants.
B)
Sum the bond energies of the products.
C)
Write the structures of the products and reactants.
D)
Subtract the bond energies of the products from the reactants.
Question 3 (5 points)
image
The starting diol for this molecule is
Question 3 options:
A)
propan-1,3-diol.
B)
ethanol.
C)
propan-1,3-dioic acid.
D)
ethan-1,2-diol.
Question 4 (5 points)
Which of the following do all substituted hydrocarbons have in common?
Question 4 options:
A)
They're short-chain hydrocarbons.
B)
They all contain oxygen.
C)
A hydrogen on an alkyl chain has been replaced by a heteroatom.
D)
They all have halogen groups.
Question 5 (5 points)
Bond energies can be used to estimate the energy of a reaction. Why is this only an estimate?
Question 5 options:
A)
The bonds in all molecules are the same, but not all molecules have bonds that are easily measured.
B)
It's difficult to measure such a small amount of energy.
C)
The same bond in a different molecule has a different energy. For example, O-H in water versus ethanol has different energies.
D)
It's difficult to isolate an individual bond.
Question 6 (5 points)
The system international (SI) unit for energy is
Question 6 options:
A)
kilocalorie.
B)
calorie.
C)
joule.
D)
pound.
Question 7 (5 points)
Steroids have a generic structure that's composed of three six-membered rings and one
Question 7 options:
A)
four-membered ring.
B)
three-membered ring.
C)
five-membered ring.
D)
two-membered ring.
Question 8 (5 points)
The primary role of the protein keratin is to
Question 8 options:
A)
speed up the formation of nails and hair.
B)
provide strength to nails and hair.
C)
make curly hair curly.
D)
tell the body to store sugar.
Question 9 (5 points)
image
The name of the structure shown is
Question 9 options:
A)
oct-7-ene-2-yne.
B)
hept-7-ene-2-yne.
C)
oct-1-ene-6-yne.
D)
hept-1-ene-6-yne.
Question 10 (5 points)
DNA utilizes free nucleotides in the cell to manufacture RNA, which is then sent to the ribosome to
Question 10 options:
A)
make DNA.
B)
make proteins.
C)
make RNA.
D)
make energy.
Question 11 (5 points)
Once the activity of americium in a smoke detector falls below 5 percent of its original activity, it's no longer able to effectively detect smoke and trigger the alarm. If the half-life of americium-241 is approximately 432.2 years, how many years will it take before the americium-241 is unable to detect smoke?
Question 11 options:
A)
10 years
B)
20 years
C)
1,868 years
D)
2 years
Question 12 (5 points)
Esters are most likely to be encountered in what department in a large department store?
Question 12 options:
A)
Perfume department
B)
Men's clothing department
C)
Women's clothing department
D)
Shoe department
Question 13 (5 points)
The half-life of a radioactive nucleus is the time it takes for _______ of the nuclei in a sample to decay.
Question 13 options:
A)
half
B)
100 units
C)
one-fourth
D)
50 disintegrations
Question 14 (5 points)
A lethal dose of radiation is
Question 14 options:
A)
20 rems
B)
500 mrems
C)
500 rems
D)
300 mrems
Question 15 (5 points)
Planar cyclic hydrocarbons are called
Question 15 options:
A)
alkenes.
B)
alkynes.
C)
aromatics.
D)
alkanes.
Question 16 (5 points)
Curium, named for Marie Curie, has approximately 25 different isotopes that emit an alpha particle when their nuclei decay. If curium-247, the most abundant nuclide, emits an alpha particle, what daughter nuclide is formed?
Question 16 options:
A)
Californium-251
B)
Californium-249
C)
Plutonium-243
D)
Plutonium-251
Question 17 (5 points)
Reactions that produce energy and have a negative amount of free energy are
Question 17 options:
A)
exothermic reactions.
B)
endothermic reactions.
C)
exergonic reactions.
D)
endergonic reactions.
Question 18 (5 points)
A Geiger counter detects radiation. Each click corresponds to _______ nucleus/nuclei decaying.
Question 18 options:
A)
three
B)
two
C)
one
D)
four
Question 19 (5 points)
image
The figure shows the metabolic pathway for aerobic respiration. What part of the process do boxes A and B represent?
Question 19 options:
A)
Citric acid cycle
B)
Glycolysis
C)
Pyruvate oxidation
D)
The transport of electrons by NADH and FADH2
Question 20 (5 points)
A nuclide is defined as
Question 20 options:
A)
a distinct isotope of an atom.
B)
all isotopes of an atom.
C)
the nucleus of an atom.
D)
the radioactive isotope of an atom.
1 of 20 questions saved
Answer:
Question 1
The Molecule Below is a polymer of glucose monomers. The molecule below is: Starch
Question 2
After writing and balancing the equation, what's the next step in using bond energies to calculate the enthalpy of a reaction? : Sum the bond energies of the products.
Explanation:
Here are the answers for 1 and 2 cause their the only answer I know, plz tell me if I'm wrong Ty
If the hexagons in the picture are representative of glucose molecules, this is most likely a representation of starch. Therefore, the correct option among all given option is option B.
What is polymer?A polymer is a substance or material consisting of very large molecules called macromolecules, composed of many repeating subunits. The repeating subunit is called monomer.
Monomer can be of same type or different type. The linkage between units of amino acid is called peptide linkage or peptide bond. If the hexagons in the picture are representative of glucose molecules, this is most likely a representation of starch. The polymer of glucose is called starch. Starch is a polysaccharides or complicated carbohydrate composed of a chain of covalently linked glucose molecules.
Therefore, the correct option among all given option is option B.
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The net ionic equation for formation of an aqueous solution of NiI2 accompanied by evolution of CO2 gas via mixing solid NiCO3 and aqueous hydriodic acid is __________.A) 2NiCO3 (s) + HI (aq) ® 2H2O (l) + CO2 (g) + 2Ni2+ (aq)B) NiCO3 (s) + I- (aq) ® 2H2O (l) + CO2 (g) + Ni2+ (aq) + HI (aq)C) NiCO3 (s) + 2H+ (aq) ® H2O (l) + CO2 (g) + Ni2+ (aq)D) NiCO3 (s) + 2HI (aq) ® 2H2O (l) + CO2 (g) + NiI2 (aq)E) NiCO3 (s) + 2HI (aq) ® H2O (l) + CO2 (g) + Ni2+ (aq) + 2I- (aq)
First you need to write out the original equation.
[tex]NiCO_{3(s)}+ HI_{aq} ->NiI_{2(aq)}+CO_{2(g)}+H_2O_{(l)}[/tex]
It needs to be balanced, though, so after balancing it should look like this:
[tex]NiCO_{3(s)}+ 2HI_{aq} ->NiI_{2(aq)}+CO_{2(g)}+H_2O_{(l)}[/tex]
The ionic equation would look like this. (Only aqueous solutions can be split up).
[tex]NiCO_{3(s)}+ 2H^+_{aq}+2I^-_{aq} ->Ni^{2+}_{aq}+2I^-_{(aq)}+CO_{2(g)}+H_2O_{(l)}[/tex]
The net ionic equation only contains the products that are not aqueous. Therefore, the final net ionic equation should be:
[tex]NiCO_{3(s)}+ 2H^+_{aq} ->Ni^{2+}_{aq}+CO_{2(g)}+H_2O_{(l)}[/tex]
So your answer is C.
Why do you think plant cells need a cell wall as well as a cell membrane?
Answer:
to protect it from harm
Explanation:
A 10 mL sample of concentrated NaCl (10.80 M) is diluted to a final volume of 650 mL. What is the molarity of the final solution
Answer:
0.166 M
Explanation:
Initial volume V1 = 10 ml
Initial concentration C1 = 10.80 M
Final volume V2 = 650 ml
Final concentration C2 = ?
The parameters are related by the following equation;
C1V1 = C2V2
Making C2 subject of formula, we have;
C2 = C1V1 / V2
Inserting the values
C2 = 10.80 * 10 / 650
C2 = 108.1 / 650 = 0.166 M
Iron, an element with the chemical symbol Fe, is an important element. It is used to make steel and is part of the substance that transports oxygen throughout the human body. Which statement about Fe is supported by the modern atomic theory but not John Dalton’s theory?
The element iron is composed of small particles called atoms.
The electrons of iron have probable locations in a region of space around the nucleus.
Iron atoms combine with other atoms in whole number ratios to form compounds.
Chemical reactions that involve iron do not create new atoms of iron.
Answer:
b
Explanation:
The statement about Fe that supports the modern atomic theory but not John Dalton's theory would be that the electrons of iron have probable locations in a region of space around the nucleus.
This is because John Dalton's atomic theory does not recognize the existence of protons, neutrons, and electrons in atoms.
Recall John Dalton's atomic theory:
all elements consist of indivisible particles called atoms.atoms of the same elements are identical and different from atoms of other elementsatoms cannot be created and neither can they be destroyedatoms of different elements can combine in a simple whole-number ratio to form compoundsThus, the postulate of the modern atomic theory that says that atoms have a structure with protons and neutrons in its nucleus and electrons in its outer shells negates one of the theories of Dalton.
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An ionic compound, such as MgF2, is held together by?
Answer:
ionic bonds
Explanation:
Because magnesium fluoride is held together by ionic bonds because it has a giant ionic structure.
NASA launches a probe with a mass of 15,000 kg to another planet more
massive than than Earth. Which statement is true about the probe once it has
reached the other planet?
A.)The weight of the probe will increase.
B.)The mass of the probe will decrease.
C.)The mass of the probe will increase.
D.)The weight of the probe will decrease .
Answer: A
Explanation: Just took the test
Relative and average atomic mass both describe properties of an element related to its different isotopes. Out of these two Relative atomic mas is more accurate. Therefore, the correct option is option D that is the weight of the probe will decrease.
What is mass?Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.
The relative mass is the mass that is with respect to mass of a matter that is considered as standard. In chemistry relative mass is equal to the mass of one-twelfth the mass of C-12 isotope .
% relative error=(Difference in weight÷ original weight)×100
The weight of the probe will decrease.
Therefore, the correct option is option D that is the weight of the probe will decrease.
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There pls help it’s due in 5 minutes!! Thanks if you do!
Explanation:
well when you heat ice the individual molecules gain kinetic energy. but until the temperature reaches it's melting point they don't have the energy to break bonds and hold their crystal structure. So, the temperature remains constant until the ice has melted. Hope this helped. Good luck on your project!
what is mean by groups of in periodic in periodic table?
Answer:
a line like this l
l
no like this-----
Explanation:
What is the mass of 5 moles of iron (III) oxide?
Answer: The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Iron(III) Oxide, or 159.6882 grams.
For an aqueous solution of glucose (C6H12O6), determine: A) The molarity of 2.00 L of a solution that contains 50.0 g of glucose
Answer:
0.139 ML⁻¹
Explanation:
The Molarity (M) of a solution is the no of moles (amount) of a solute dissolved in a litre of solution.
M = no of moles / 1 litre of solution of solution
The first step is to calculate the no of moles of Glucose contained in 50g of it
No of moles of glucose = mass/ molar mass of glucose
= 50g / (180.156)g/mol
= 0.27753≅0.278 moles of glucose
Therefore, the molarity of glucose in 2L of solution
= 0.278 moles / 2 lites
= 0.139M/Litre of glucose
= 0.139 ML⁻¹ of glucose
How could a forest grow on a Mountain that is surrounded by a desert?
Answer: Mountains recive lots of landfall, even when surrounded by a desert. It gets cold up in the peek, and when the snow melts, water would seep into the soil.
Explanation:
