Explanation:
A bronsted lowry acid is any species that can donate a hydrogen proton (H+) to another molecule.
A bronsted lowry base is any species that can receive a hydrogen proton (H+) from another molecule.
a. hbr h2o --> h30+ br-
The Bronsted-Lowry acid is HBr
It's conjugate base is Br-
The Bronsted-Lowry base is H2O
It's conjugate acid is h30+
b. NO-2 H2o --> HNO2 OH-
The Bronsted-Lowry acid is H2O
It's conjugate base is OH-
The Bronsted-Lowry base is NO-2
It's conjugate acid is HNO2
a sample of argon gas is cooled and its volume went from 380. mL to 250. mL. If its final temperature was -55.0C, what was its original temperature
Answer:
The initial temperature was 58.4°C
Explanation:
Given the following data:
initial volume = V₁ = 380 mL = 0.38 L
final volume = V₂ = 250 mL = 0.25 L
final temperature = T₂ = -55°C = 218 K
According to Charles's law, the volume of a gas is directly proportional to the temperature (in Kelvin). The mathematical expression is:
V₁/T₁= V₂/T₂
So, we calculate the initial temperature (V₁) as follows:
T₁ = T₂/V₂ x V₁ = 218 K/(0.25 L) x 0.38 L = 331.36 K ≅ 331.4 K
Finally, we convert the initial temperature from K to °C:
T₁= 331.4 K - 273 = 58.4°C
Which of the values below could be the pH of a solution that contains 7.8 x 10-6 M H30' at 25°C.
pH=5.108
Further explanationpH shows the degree of acidity of a solution. The value between 0-14
The greater the value of H + ion concentration, the more acidic the solution is
Given
Concentration of H₃O = 7.8 x 10⁻⁶ M
Required
pH of a solution
Solution
pH= - log [H₃O⁺]
pH=-log[7.8 x 10⁻⁶]
pH=6-log 7.8
pH=5.108
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.
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.
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:
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
Explain in YOUR words what factors determine which type of fossil fuel forms; coal, oil, or gas.
Answer: three very important kinds of things: coal, oil, and natural gas.
Explanation:
Fossils are the preserved remains of plants and animals whose bodies were buried in sediments.
Factors for determining fossils:The creation of fossil fuels—either oil, natural gas, or coal—from these fossils is determined by the type of fossil, the amount of heat, and the amount of pressure. Fossil fuels are hydrocarbons comprised primarily of the following elements: carbon and hydrogen and some sulfur, nitrogen, oxygen, and mineral matter.
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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
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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This is the picture answer this plsss..
Answer:
he is a weelder because of him taking a peice of metal and recreateing it.
Explanation:
Name the plant cell organelle where
photosynthesis occurs.
Answer:
chloroplast organelle
Answer. The photosynthesis process takes place in the chloroplast organelle in the growing tissues. As the chlorophyll pigment is available in the chloroplast organelle which is the main photosynthetic pigment, with the help of the molecules they capture the energy of light.
Explanation:
chloroplasts
In plants, photosynthesis takes place in chloroplasts, which contain the chlorophyll. Chloroplasts are surrounded by a double membrane and contain a third inner membrane, called the thylakoid membrane, that forms long folds within the organelle.
The plant cell organelle where photosynthesis occurs is the chloroplast. Chloroplasts contain chlorophyll, a green pigment that captures light energy from the sun and converts it into chemical energy through photosynthesis.
The chloroplast is a vital organelle in plant cells responsible for the process of photosynthesis. It contains the green pigment chlorophyll, which captures sunlight energy during the light-dependent reactions. This energy is then used to convert carbon dioxide and water into glucose and oxygen during the light-independent reactions.
Photosynthesis is crucial for plant growth and survival, as it produces food (glucose) that serves as an energy source for the plant's metabolism and growth.
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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 element is 1s2 2s2 2p6 3s2 3p6 3d7 4s1
Answer:
The element is Iron
Explanation:
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.
Which of the following is an endothermic process? A. an iron lock rusting B. combustion of coal C.the corrosion layer that formed on the statue of liberty D. isolation of elemental iron from iron ore
Answer:
D
Explanation:
These processes pull heat (energy) from their surroundings to change from one state to another
Answer:
d
Explanation:
All members of the alkene series of hydrocarbons have the general formula:
Select one:
a. CnH2n-2
b. CnH2n+2
C. CnHn
d. CnH2n
Igneous rocks would most likely be found near:
Answer:
the deep sea floor. Known as the oceanic crust.
Explanation:
The deep seafloor (the oceanic crust) is made almost entirely of basaltic rocks, with peridotite underneath in the mantle. Basalts are also erupted above the Earth's great subduction zones, either in volcanic island arcs or along the edges of continents.
Hope this helps :)
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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what is mean by groups of in periodic in periodic table?
Answer:
a line like this l
l
no like this-----
Explanation:
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.
Best regards!
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).
25.0 mL of 0.160 M Sr(NO3)2 is mixed with 75.0 mL of 0.022 M NaF. A precipitate of SrF2 forms. What is [F-] at equilibrium?
The concentration of fluoride ion [F⁻] at equilibrium = 0.0009 M
Moles of F⁻ in 75 mL of 0.022 M NaF is first determined:
The dissociation equation of NaF is given as follows:
NaF (aq) ----> Na (aq) + F⁻ (aq)
1 mole of NaF produces 1 mole of F⁻ ions
Number of moles = Molarity * volume
Number of moles of NaF = 0.022 M * 0.075 L = 1.65 * 10⁻³ moles
Therefore, moles of F⁻ = 1.65 * 10⁻³ moles
The dissociation equation of Sr(NO₃)₂ is given as follows:
Sr(NO₃)₂ (aq) ---> Sr²⁺ (aq) + 2 NO₃⁻ (aq)
1 mole Sr(NO₃)₂ produces 1 mole Sr²⁺
moles of Sr²⁺ in 25.0 mL solution = 0.025 L * 0.160 M
moles of Sr²⁺ in 25.0 mL solution = 4.0 * 10⁻³ moles
Equation of reaction of Sr²⁺ and F⁻ is given below:
Sr²⁺ (aq) + 2 F⁻ (aq) ⇄ SrF₂ (s)
The solubility product constant, Ksp = 2.0 x 10⁻¹⁰
1 mole of Sr²⁺ reacts with 2 moles of F⁻
4.0 * 10⁻³ moles of Sr²⁺ will react 2 * 4.0 * 10⁻³ moles of F = 8.0 * 10⁻³ moles of F⁻
Therefore, F⁻ is the limiting reactant
Moles of Sr²⁺ left = 4.0 * 10⁻³ - 1.65 * 10⁻³
Moles of Sr²⁺ left = 2.35 * 10⁻³ moles
Concentration of Sr²⁺ = moles / total volume
total volume = 100 mL = 0.1 L
Concentration of Sr²⁺ at equilibrium = 2.35 * 10⁻³/0.1 = 2.35 * 10⁻² M
Assuming change in concentration at equilibrium is very small
[Sr²⁺][F⁻]² = Ksp = 2.0 x 10⁻¹⁰
[F⁻]² = Ksp/[Sr²⁺]
[F⁻]² = 2.0 x 10⁻¹⁰/2.35 * 10⁻²
[F⁻]² = 8.5 * 10⁻⁷ M
[F⁻] = 0.0009 M
Therefore, the concentration of fluoride ion [F⁻] at equilibrium = 0.0009 M
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i need this quickly please god bless u all
Can't see well , post again and ill make sure to help.
Ethane (C2H6) combines with oxygen to
yield carbon dioxide and water.
Let's begin by writing the unbalanced
chemical equation:
Answer:
a
Explanation:
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.
How many electrons does the copper atom lose in the process: Cu → Cu3+ + ? electrons
Answer:
3
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!
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
Definition of e = mc2
Answer:
Energy equals mass times the speed of light squared.
Explanation:
can i get brainliest? lol :) hope that helps
Answer:
E=mc2 means energy equals matter to the speed of light by the power of 2
Explanation:
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:
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