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A hydrogen on an alkyl chain has been replaced by a heteroatom.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
Answers
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.
To know more about polymer, here:
https://brainly.com/question/1443134
#SPJ2
Related Questions
how many moles are in 24.75 g of H2O? What is given the conversation and the unknown?
Answers
Answer:
1.373 mol H₂O
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:
Step 1: Define
24.75 g H₂O
Step 2: Identify Conversions
Molar Mass of H - 1.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of H₂O - 2(1.01) + 16.00 = 18.02 g/mol
Step 3: Convert
[tex]24.75 \ g \ H_2O(\frac{1 \ mol \ H_2O}{18.02 \ g \ H_2O} )[/tex] = 1.37347 mol H₂O
Step 4: Check
We are given 4 sig figs. Follow sig fig rules and round.
1.37347 mol H₂O ≈ 1.373 mol H₂O
Which of the following sets of atoms can be joined by a ionic bond?
a. C and H
b. Mg and Na
c. N and H
d. Na and Cl
e. P and Cl
It's not B
Answers
Answer:
Na and Cl option d.
Explanation:
Ionic bond commonly occurs between a metal and non metal on combining to produce a compound.
In that case, the most appropriate choice would be to go with
option d - Na and Cl.
They combine to form common salt or NaCl.
Na ( sodium) is a metal while Cl (chlorine) is a non metal.
After an electric sign is turned on, the temperature of its glass goes from 23.5°C to 65.5°C. The sign’s glass has a mass of 905 grams, and the specific heat capacity of the glass is 0.67 joules/gram degree Celsius. How much heat did the glass absorb? Type the correct answer in the box. Use numerals instead of words. Express your answer to the correct number of significant figures.
Answers
The sign's glass absorbed 25466.7 J
Further explanationGiven
The temperature of glass : 23.5 °C to 65.5 °C
mass = 905 g
the specific heat capacity = 0.67 J/g °C
Required
Heat absorbed
Solution
Heat absorbed by sign's glass can be formulated :
[tex]\tt Q=m.c.\Delta T[/tex]
ΔT=65.5 - 23.5 = 42
[tex]\tt Q=905\times 0.67\times 42\\\\Q=\boxed{\bold{25466.7~J}}[/tex]
Answer:
Explanation:
you round it. I just did this and it's just 25,000. Hope this helps you.
Does a reaction occur when aqueous solutions of copper(II) sulfate and lead(II) nitrate are combined?
a) Yes
b) No
Answers
In my opinion yes but thats me
Calculate the standard free energy for the following reaction at 25°C.
Zn (s) + 2Ag (aq) --------> Zn2 (aq) 2Ag (s)
Answers
What do glycine, leucine, and lysine all have in common?
They are the building blocks of proteins.
They have an important role in the heart.
They have a role in the functioning of the stomach.
They store equal amounts of energy in their bonds.
Answers
Answer:
A
Glycine, luecine, and lysine are all building blocks of proteins
What is the mass of 25 Liters of nitrogen dioxide gas?
Answers
Answer:
cacfat lebron
Explanation:
mruno bars is the wae
eat my co-ck
coileach
coileach
coileach
coileach
coileach
coileach
coileach
coileach
coileach
coileach
coileach
Cobalt, Co, has 27 electrons. Write out the entire electron configuration for cobalt using spdf notation.
Answers
Answer:
Co = 1s2 2s2 2p6 3s2 3p6 4s2 3d7
Explanation:
Number of electrons = 27
The closest noble gas before cobalt is Argon and argon has 18 electrons.
Co = [Ar] ; Remains 27 - 18 = 9 more electrons to fill.
The next orbital in order of increasing energy is the 4s orbital. However it can only hold a maximum of 2 electrons.
We have;
Co = [Ar] 4s2; Remains 27 - 20 = 7 more electrons to fill.
The next orbital in order of increasing energy is the 3d orbital. It can have a maximum of 10 electrons.
So we have;
Co = [Ar] 4s2 3d7
The electronic configuration of Ar = 1s2 2s2 2p6 3s2 3p6
This means the entire configuration of cobalt is;
Co = 1s2 2s2 2p6 3s2 3p6 4s2 3d7
what is mineral in science?
Answers
Answer:
minerals
Explanation:
defines a mineral as "a naturally occurring inorganic element or compound having an. orderly internal structure and characteristic chemical composition, crystal form, and physical. properties." Minerals differ from rocks, which are naturally occurring solids composed of one or more minerals.
The glass transition temperature will (circle the correct answer): a. ( increase / decrease ) as the molecular weight increases. b. ( increase / decrease ) as the strength of the chain-chain bonding decreases. c. ( increase / decrease ) as the pressure increases (we did not cover this in the notes but what do you think should happen).
Answers
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.
f 325 g of water at 4.2°C absorbs 12.28 kJ, what is the final temperature of the water? The specific heat of water is 4.184 J/g·°C
Answers
Answer: 13.23 degrees C
Explanation:
Q= mc(Tfinal-Tinitial)
(Use the specific heat equation)
The final temperature of the water after the absorption of 12.28 kJ of energy has been 13.23 [tex]\rm ^\circ C[/tex].
Specific heat can be defined as the amount of heat required to raise the temperature of 1 gram of a substance by 1 degree celsius.
The specific heat can be expressed as:
Heat = mass [tex]\times[/tex] specific heat [tex]\times[/tex] (Final temperature - Initial temperature)
From the given:
12.28 kJ = 325 g [tex]\times[/tex] 4.184 J/g[tex]\rm ^\circ C[/tex] [tex]\times[/tex] (Final temperature - 4.2 [tex]\rm ^\circ C[/tex])
12.28 [tex]\times[/tex] 1000 J = 1,359.8 (Final temperature - 4.2 [tex]\rm ^\circ C[/tex] )
12,280 = 1,359.8 (Final temperature - 4.2 [tex]\rm ^\circ C[/tex] )
9.03 = Final temperature - 4.2 [tex]\rm ^\circ C[/tex]
Final temperature = 13.23 [tex]\rm ^\circ C[/tex]
The final temperature of the water after the absorption of 12.28 kJ of energy has been 13.23 [tex]\rm ^\circ C[/tex].
For more information about specific heat, refer to the link:
https://brainly.com/question/22238883
During laparoscopic surgery, CO2 gas is used to expand the abdomen to help create a larger
working space. If the CO2 injected into the abdomen produces a pressure of 20.0 mmHg
and a volume of 4.00 L at 32.0C, how many grams of CO2 were used?
Answers
Answer:
The answer to your question is V2 = 4.97 l
Explanation:
Data
Volume 1 = V1 = 4.40 L Volume 2 =
Temperature 1 = T1 = 19°C Temperature 2 = T2 = 37°C
Pressure 1 = P1 = 783 mmHg Pressure 2 = 735 mmHg
Process
1.- Convert temperature to °K
T1 = 19 + 273 = 292°K
T2 = 37 + 273 = 310°K
2.- Use the combined gas law to solve this problem
P1V1/T1 = P2V2/T2
-Solve for V2
V2 = P1V1T2 / T1P2
-Substitution
V2 = (783 x 4.40 x 310) / (292 x 735)
-Simplification
V2 = 1068012 / 214620
-Result
V2 = 4.97 l
The standard cell potential (E° cell) of the reaction below is +1.34 V. The value of ΔG° for the reaction is kJ/mol.
3Cu(s)+2MnO−4(aq)+8H+(aq)→3Cu2+(aq)+2MnO2(s)+4H2O(l)
The standard cell potential (E cell) of the reaction below is +1.34 V. The value of G° for the reaction is kJ/mol.
3Cu(s)+2MnO−4(aq)+8H+(aq)→3Cu2+(aq)+2MnO2(s)+4H2O(l)
a. -776
b. +259
c. -24.3
d. +776
e. -259
Answers
Answer:
-776 KJ/mol
Explanation:
We must look towards the balanced reaction equation in order to obtain the number of electrons transferred in the redox reaction.
3Cu(s) + 2MnO4^-(aq) + 8H^+(aq)------>3Cu2+(aq) + 2MnO2(s) + 4H2O(l)
We can easily see that copper lost six electrons while Manganese gained six electrons hence n=6
ΔG =-nFEcell
Where;
n= 6
F = 96500 C
Ecell=+1.34
ΔG = -(6 * 96500 * 1.34)
ΔG = -776 KJ/mol
PLEASE HELP!!!!
How many miles of F are there in 0.570 moles of C3H2F6 ?
Answers
There are 3.42 moles of F in 0.570 moles of C₃H₂F₆
Further explanationGiven
0.570 moles of C₃H₂F₆
Required
moles of F
Solution
The chemical formula of a compound shows the mole ratio of the constituent elements
In the compound C₃H₂F₆, the mole ratio of the elements is:
C: H: F = 3: 2: 6
So in 1 mol of C₃H₂F₆, there are 3 moles of C, 2 moles of H and 6 moles of F
And for 0.570 mol of C₃H₂F₆ :
[tex]\tt moles~F=\dfrac{0.57}{1}\times 6=3.42[/tex]
PLEASEEE HELPPP
13. Find the density of a cube with a side measurement of 4 cm and a mass of 4g.
Remember: You must first find the volume of the cube which measures the same on on three sides (LxWxH)
a- 16 g/cubic centimeter
b- 1 g/cubic centimeter
c- 3 g/cubic centimeter
d- 0.0625 g/cubic centimeters
14. Density, melting point, boiling point and solubility are all characteristic properties of matter. They can be used to identify substances.
a- true
b- false
18. Which of the following describes a solution in which more solute can be added
a- unsaturated
b- saturated
c- super saturated
d- insoluble
19. If you add sand to water and stir, the sand settles at the bottom and does not dissolve. Which word best describes the sand in the water?
a- supersaturated
b- saturated
c- soluble
d- insoluble
20. Which of the following are factors that affect the rate of dissolving?
Group of answer choices
a- color, shape, size
b- mass, volume, density
c- stirring, temperature, surface area
d- No answer text provided.
Answers
Which type of energy refers to the sum of potential and kinetic energies in the particles of a substance?
motion
stored
internal
heat
If you answer fast u get all the hearts
Answers
Explanation:
the sum of PE and KE is mechanical energy this means energy during motion and position I think the answer is motion and stored or it may be internal
Answer:
a
Explanation:
i did the test
please solve this ASAP thank you
for 20 points
Answers
Answer:
hi
Explanation:
One stereoisomer of 1,2,3,4,5,6-hexabromocyclohexane undergoes elimination extremely slowly when subjected to basic conditions. Identify this stereoisomer and provide a MO justification for this observation.
Answers
Explanation:
The answer can be found in attachment with detailed explanation. Please check.
If the mass of 10.0 mL of the salt solution is 10.3 grams, what is the density of the salt solution?
Answers
Answer:
1.03
Explanation:
Which group contains elements with two valence electrons?
Answers
Answer:
its group A
Explanation:
Acid rain is a dilute solution of acids that dissolve the calcium carbonate in limestone statues. Concentrated acids can dissolve a large piece of limestone in a few days. Statue breakdown due to acid rain can take decades, but statues with intricate carvings break down more quickly. Explain these observations in terms of reaction rates.
Answers
Answer:
See the answer below
Explanation:
A weak solution of acid would gradually dissolve the calcium carbonate in limestone statues. For example, dilute sulphuric acid formed from the dissolution of SO2 in rainwater would react with calcium carbonate according to the following equation;
[tex]H_2SO_4(aq)+CaCO_3(s)-->CaSO_4(s)+CO_2(g)+H_2O (l)[/tex]
Generally, the rate of any reaction depends on a host of factors such as temperature, pressure, presence of catalysts, and surface area of reactants. The higher the surface area of reactants, the higher the rate of reaction.
In this case, the rate of reaction of the dilute acid and the calcium carbonate depends on the surface area of the calcium carbonate which happens to be the only solid reactant. Statues with intricate carvings seem to break down more quickly than ordinary statues because they offer more surface area for reaction to take place. The intricate carvings create more surface area for reactions when compared to statues without intricate carvings.
Answer:
The time taken for the statue to break down depends on the reaction rate.
The low concentration of acids in acid rain reduces the reaction rate and increases the time required to break down the statue.
Intricate carvings increase the surface area of the statue and therefore increase the rate of the statue’s breakdown.
Explanation:
EDGE2021
A 35.0-mL solution of 0.075 M CaCl2 is mixed with 25.0 mL of 0.090 M BaCl2.
If aqueous KF is added, which fluoride precipitates first?
Answers
Answer:
The fluoride which precipitates first is CaF₂
Explanation:
When F⁻ is added, CaF₂ and BaF₂ are produced following the ksp equation:
For CaF₂:
Ksp = 3.2x10⁻¹¹ = [Ca²⁺] [F⁻]²
Where [Ca²⁺] = 0.075M * {35mL / (25mL + 35mL)} = 0.04375M
3.2x10⁻¹¹ = [0.04375M] [F⁻]²
[F⁻]² = 7.31x10⁻¹⁰
[F⁻] = 2.7x10⁻⁵M
CaF₂ begins precipitation when [F⁻] = 2.7x10⁻⁵M.For BaF₂:
Ksp = 1.5x10⁻⁶ = [Ba²⁺] [F⁻]²
Where [Ba²⁺] = 0.090M * {25mL / (25mL + 35mL)} = 0.0375M
1.5x10⁻⁶ = [0.0375M] [F⁻]²
[F⁻]² = 4x10⁻⁵
[F⁻] = 6.3x10⁻³M
BaF₂ begins precipitation when [F⁻] = 6.3x10⁻³M
Thus, the fluoride which precipitates first is CaF₂
what leads to the formation of a wind chill factor
Answers
Answer:
What leads to the formation of a wind chill factor? A change in the air temperature creates air pressure differences in the atmosphere
Explanation:
hope this helps :)
What is true about resonance structures? Select the correct answer below: They are all different molecules. The interconvert with one another. They each partially describe the bonding in a molecule. They each fully describe the bonding in a molecule.
Answers
Answer:
The correct answer is: They each partially describe the bonding in a molecule.
Explanation:
Some chemical molecules cannot be described completely by using only one Lewis structure. In these cases, we can describe the molecule by drawing 2 or more Lewis structures, and the structures are called resonance structures. The overall molecular structure is explained by all the resonance structures together. So, they each describe the bonding in the molecule only partially.
What is the electron arrangement around an atom in a molecule or ion which is surrounded by three lone pairs of electrons and one single bond
Answers
Answer:
Tetrahedral
Explanation:
According to the valence shell electron pair repulsion theory, the number of electron pairs on a molecule determines the arrangement of electrons around the central atom of the molecule or ion.
In this case, there are four electron pairs around the central atom in the molecule or ion hence they are arranged in tetrahedral geometry. Note that the lone pairs only determine the molecular geometry and not the electron geometry or arrangement.
Is the formal charge on N the same or different in these two species? Is the formal charge on the same or different in these two species?
a) The formal charge on N is 0 in both species.
b) The formal charge on N is 0 in HNO2 and +1 in NO2−.
c) The formal charge on N is +1 in HNO2 and 0 in NO2−.
d) The formal charge on N is +1 in both species.
Answers
Answer:
a) The formal charge on N is 0 in both species.
Explanation:
The formal charge is calculated using the formular;
FC = V-N-B/2
Where;
V = Number of Valence electrons
N = number of nonbonding valence electrons
B = total number of electrons shared in bonds
In NO2-;
The formal charge of N is given as;
FC = 5 - 2 - 6/2
FC = 0
In HNO2
The formal charge of N is given as;
FC = 0
The correct option is;
a) The formal charge on N is 0 in both species.
which of the following elements has properties different than the rest?
Ac
Co
Cu
Sc
Answers
Answer:
Ac
Explanation:
Answer:
The answer is a
Explanation:
Ac
What is the net ionic equation for the reaction if any that occurs when aqueous solutions of Na2CO3 and HCL are mixed?
Answers
Answer:
CO₃²⁻(aq) + 2H⁺(aq) → CO₂ (g) + H₂O (l)
Explanation:
The balanced reaction between Na2CO3 and HCl is given as;
Na₂CO₃ (aq) + 2 HCl (aq) → 2 NaCl (aq) + CO₂ (g) + H₂O (l)
The next step is o express the species as ions.
The complete ionic equation for the above reaction would be;
2Na⁺(aq) + CO₃²⁻(aq) + 2H⁺(aq) + 2Cl⁻(aq) → Na⁺(aq) + Cl⁻(aq) + CO₂ (g) + H₂O (l)
The next step is to cancel out the spectator ion ions; that is the ions that appear in both the reactant and product side unchanged.
The spectator ions are; Na⁺ and Cl⁻
The net ionic equation is given as;
CO₃²⁻(aq) + 2H⁺(aq) → CO₂ (g) + H₂O (l)
in general, ionic compounds have
Answers
Which is the main type of element found in the upper right part of the periodic table? O A. Metals B. Representative metals O C. Nonmetals D. Metalloids
Answers
Answer: The main type of elements found in the upper right part of the periodic table are the Nonmetals. The correct option is C.
Explanation:
The Periodic table of elements describes the properties of elements which varies in regular manner. Some of these chemical properties includes:
--> Ionisation energy
--> Atomic radii
--> Ionic radii
--> Electron affinity
--> electronegativity
--> metallic Character
--> Atomic volume
It organizes known elements based on these chemical properties. From the features of a Periodic table of elements, they occur in;
--> GROUPS(when similar elements are the arranged in numbered columns). These groups are the alkali metals, alkaline earth metals, halogens and noble gases.
--> PERIODS( when arranged in numbered rows).
Every element can either be classified as a metal, nonmetal or semi metal. NONMETALS are poor conductors of heat and electricity. They are clustered in the upper right-hand corner of the periodic table.
