Answer:
Explanation:
1 mol of anything is 6.02 * 10^23 (in this case molecules)
x mol has 9.06 * 10^24 molecules of NaNO3
x * 6.02 * 10^23 = 9.06 * 10^24 * 1 Divide by 6.02 * 10^23
x = 9.06 * 10^24/6.02 * 10^23
x = 1.5 * 10
x = 15 mols of NaNO3
1 mol of NaNO3
Na = 23
N = 14
O3 = 48
Total = 85
1 mol of NaNO3 = 85 grams
15 mols = x Cross Multiply
x = 15 * 85
x = 1275 grams
Note: these numbers are approximate but they are very close. You have to use your own values from your periodic table to find the mass of NaNO3. Your answer will be very close to 85.
Guys I don't know science, if you are intelligent tell me what is science
Explanation:
Science is the pursuit and application of knowledge and understanding of the natural and social world following a systematic methodology based on evidence
Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy AH and reaction entropy
AS.
Note: if you have not been given enough information to decide a sign, select the "unknown" option.
Answer:
Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy AH and reaction entropy AS. Note: if you have not been given enough information to decide a sign, select the "unknown" option observations conclusions reaction ΔΗ is (pick one) The reverse of this reaction is always spontaneous. A As is (pick one) This reaction is spontaneous except below ΔΗ is (pick one) 38. °C but proceeds at a faster rate above (pick one) 91. °C As is ΔΗ iS (pick one) Crystallization of a pure compound is C spontaneous only below 146. °C. AS is (pick one) X
Wat are representative elements
Answer:
the representative elements are elements where the the s and p orbitals are filling. The transition elements are elements where the d orbitals (groups 3-11 on the periodic table) are filling, and the inner transition metals are the elements where the f orbitals are filling.
Explanation:
=)
Determine the number of moles of C in each sample
2.0 mol CH4, 0.175 mol C2H6,
4.21 mol C4H10, 24.5 mol C8 H18
Explanation:
In [tex]CH_4[/tex]:Given moles = 2.0 moles
1 mole of methane contains 1 mole of carbon and 4 moles of hydrogen
Moles of carbon in [tex]CH_4=(2.0\times 1)=2.0 moles[/tex]
In [tex]C_2H_6[/tex]:Given moles = 0.175 moles
1 mole of ethane contains 2 moles of carbon and 6 moles of hydrogen
Moles of carbon in [tex]C_2H_6=(0.175\times 2)=0.35 moles[/tex]
In [tex]C_4H_{10}[/tex]:Given moles = 4.21 moles
1 mole of butane contains 4 moles of carbon and 10 moles of hydrogen
Moles of carbon in [tex]C_4H_{10}=(4.21\times 4)=16.84 moles[/tex]
In [tex]C_8H_{18}[/tex]:Given moles = 24.5 moles
1 mole of octane contains 8 moles of carbon and 18 moles of hydrogen
Moles of carbon in [tex]C_8H_{18}=(24.5\times 8)=196 moles[/tex]
Gizmo Warm-up Just like students sharing markers, atoms sometimes share or swap electrons. By doing this, atoms form bonds. The Ionic Bonds Gizmo allows you to explore how ionic bonds form. To begin, check that Sodium (Na) and Chlorine (Cl) are selected from the menus at right. Click Play ( ) to see electrons orbiting the nucleus of each atom. (Note: These atom models are simplified and not meant to be realistic.) 1. Each atom consists of a central nucleus and several shells that contain electrons. The outermost electrons are called valence electrons. How many valence electrons does each atom have
Answer: Sodium element has 1 valence electron and chlorine element has 7 valence electrons.
Explanation:
Valence electrons are defined as the electrons that are present in the outermost shell.
An ionic compound is formed when the complete transfer of electrons takes place from one element (usually metals) to another element (usually non-metals).
To know this, we need to write the electronic configuration of each element.
Sodium is the 11th element of the periodic table and has an electronic configuration of [tex]1s^22s^22p^63s^1[/tex]
It has 1 valence electron
Chlorine is the 17th element of the periodic table and has an electronic configuration of [tex]1s^22s^22p^63s^23p^5[/tex]
It has 7 valence electrons
Hence, sodium element has 1 valence electron and chlorine element has 7 valence electrons.
State three natural conditions under which plasmolysis could occur
Answer:
When the cell is placed in salt solutionWhen leave celss dryWhen cells are placed in sugar solutionExplanation:
Hope this helps
The concentration of a solute in a solution is greater than the maximum concentration that is predicted from the solute's solubility
Look at this picture.
Which process in the water cycle is shown in the picture?
evaporation
transpiration
condensation
precipitation
Answer:
condensation
Explanation:
the water has condensed from the gaseous form into rain drops
Answer:
precipitation
Explanation:
Which of the following mixtures is best separated by the use of a separating funnel?
methane and water
ethyl ethanoate and water
ethanol and water
ethanoic acid and water
Answer:
ethyl ethanoate and water
Explanation:
At the point when one fluid doesn't blend in with another yet glides on top of it, an isolating pipe can be utilized to isolate the two fluids. Oil glides on water. This combination can be isolated utilizing an isolating channel as demonstrated on the following page.
Ethyl liquor and water are two miscible fluids. Refining is a cycle that can be utilized to isolate an unadulterated fluid from a combination of fluids. An isolating channel can be utilized to isolate the parts of the combination of immiscible fluids.
The answer is ethyl ethanoate and water. Hope this helps you!
what is most likely to happen during a precipitation reaction
A substance will react with oxygen to form water and carbon. ... dioxide.
Answer:
it will rain and there the other defined for precipitation snow and sleet and hail
What law allows calories to be determined by heat (energy) transfer from one substance to another, but it is never destroyed?
Answer:
matter i think
Explanation:
matter i am pretty sure
The law that allows calories to be determined by heat (energy) transfer from one substance to another, but it is never destroyed is first law of thermodynamics.
What is first law of thermodynamics?Energy cannot be generated or destroyed, only changed in form, according to the basic law of thermodynamics.
Energy transfer occurs when mass crosses the control boundary, external work is performed, or heat is transferred across the boundary in any system. These cause the stored energy in the control volume to shift.Hence first law of thermodynamics justify the given statement.
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The earth's crust is:
made of rock
the thinnest layer
broken into large pieces called plates
all of the above
Answer:
all of the above
Explanation:
have a nice day :-)
What is the role of a decomposer in a food chain?
A. to move food from producers to consumers
B. to move food from consumers to other consumers
C. to make food for the ecosystem
D. to return matter to the environment
Answer:D
Explanation:
Decomposers decompose food and return it to the environment through the soil
What is the molar mass of 12?
Answer:
I assume your talking about carbon when you say 12 so it'd be 12 grams if you are
Explanation:
The molar mass of any substance in grams per mole is numerically equal to the mass of that substance expressed in atomic mass units.
Hope this helps you some
pasagot plizzz kung sino makasagot ng tamang sagot ibebrainliest ko
Answer:
1. B
2.B
3.B
4.C
5.C
Explanation:
I hope this help you
the beaker contains 0.2556 m h2so3 and the buret contains 0.3106 m naoh what happens to the conductivity during titration
Answer:
Before the equivalence point, conductivity is decreasing. After the equivalence point, conductivity is increasing
Explanation:
In solution H2SO3 produce H+ ions and SO3²⁻ ions. In the same way, NaOH produce Na⁺ and OH⁻ ions. The conductivity of a solution is directly proportional to the concentration of ions in a solution. During titration, you are adding more NaOH (That is, more Na⁺ and OH⁻ ions). But each moles of OH⁻ reacts with H⁺ ion producing H₂O. That means the moles of Na⁺ that you are adding = Moles of H⁺ are been consumed. The concentration of ions remains approximately constant. But, H⁺ ion conducts better than Na⁺ ion. That means before the equivalence point, conductivity is decreasing. But after the equivalence point you will add OH- ions in excess increasing ion concentration increasing the conductivity:
After equivalence point, conductivity is increasing.
What is its density in kilograms per cubic meter?
Copper has a density of 8950 kg/m3 = 8.95 kg/dm3 = 8.95 g/cm3. Water has a density of 1000 kg/m3 = 1000 g/L = 1 kg/dm3 = 1 kg/L = 1 g/cm3 = 1 g/mL.
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A can contains 375mL of soda. Using the appropriate number of significant figures, how much soda is left in the can after 308mL is poured into a glass
Answer:
[tex]V_l=67mL[/tex]
Explanation:
From the question we are told that:
Initial Volume [tex]V_1=375mL[/tex]
Final Volume [tex]V_2=308mL[/tex]
Generally the equation for Left-Over is mathematically given by
[tex]V_l=V_1-V_2[/tex]
[tex]V_l=375-308[/tex]
[tex]V_l=67mL[/tex]
HELP ME PLZ AND THANKS I WILL MARK YOU AS BRAINLIEST!!!
Answer:
Final pressure = 6 atm
Final volume = 1.1 L
Final temperature = 100 K
Explanation:
We are given;
Initial Pressure; P1 = 2 atm
Initial volume; V1 = 3.3 L
Initial temperature; T1 = 27° C + 273 = 300 K
Final pressure; P2 = 6 atm
We will use Boyles law to get the final volume.
P1V1 = P2V2
V2 = (P1 × V1)/P2
P2 = (2 × 3.3)/6
V2 = 1.1 L
We can use Charles law to find the final temperature.
V1/T1 = V2/T2
T2 = (V2 × T1)/V1
T2 = (1.1 × 300)/3.3
T2 = 100 K
What is the price coke difference between a strong and weak acid?
Explanation:
Strong acids are those that are completely ionized in body fluids, and weak acids are those that are incompletely ionized in body fluids. Hydrochloric acid (HCl) is considered a strong acid because it is present only in a completely ionized form in the body, whereas carbonic acid (H2 CO3) is a weak acid because it is ionized incompletely, and, at equilibrium, all three reactants are present in body fluids. See the reactions below.
H2 CO3 (acid)↔H+ + HCO3- (base)
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Write the structural formula for a primary, a secondary, and a tertiary constitutionally isomeric alcohol of the molecular formula C5H12O.
Answer:
The structures of all isomeric alcohols of molecular formula C5H12O along with their IUPAC names are as shown.
Their classification of primary, secondary, and tertiary alcohols are -
1-pentanol -
2-pentanol -
3-pentanol
2-methylbutan-1-ol
2-methylbutan-2-ol
3-methylbutan-2-ol
3-methylbutan-1-ol
2,2-dimethylpropanol
Draw the structure of the neutral organic product formed in the reaction. Do not draw counterions or byproducts.
Answer: Hello the reaction related to your question is missing attached below is the reaction
answer : attached below
Explanation:
The structure of the neutral organic product formed in the reaction is attached below.
The neutral organic product formed is ESTER
The reaction in the question is Anhydride on reaction with alcohol
Lee y analiza a detalle el Anexo #1 de este plan de trabajo el cual habla sobre las fuentes alternativas de energía. Posteriormente con la información elabora un cartel o un cuadro sinóptico en tu cuaderno donde organices la información para darla a conocer a los miembros de tu comunidad.
Answer: el texto no es tan claro
Según la cinética química para que una reacción ocurra, los átomos o moléculas deben
I. Chocar con la suficiente energía. II. Chocar con una concentración adecuada. III. Ser choques efectivos
A) Solo I.
B) Solo I y II.
C) Solo I y III.
D) Solo II y III.
E) I, II, III.
Answer:
solo I
Explanation:
Según esta teoría para que se produzca una reacción deben cumplirse tres condiciones: Las moléculas de los reactivos tienen que chocar entre sí. Estos choques deben de producirse con energía suficiente de forma que se puedan romper y formar enlaces químicos.
A community has a nearby forest that has some insect-damaged trees that are dying. They decide to cut the dying trees and sell the wood for
firewood.
How does science knowledge support this solution?
A. Cutting down the trees allows more animals to live in the forest.
B. Using the trees for firewood eliminates pollution caused by heating homes.
C. Selling the diseased trees as firewood allows the community to make money.
D. Removing the diseased trees allows the remaining trees to get more water and sunlight.
The molecule β-carotene has λ 450 nm, and ɛ = 15,000 m2 mol-1. Calculate the absorption (A) expected for a solution in which 0.1 mg has been dissolved in 10 ml of water (given: the molecular weight of β-carotene, C40H56, as 536) with a path length of 1 cm. Group of answer choices
Answer: The absorbance for a solution is 0.0028
Explanation:
To calculate the absorption of a solution, the equation by Beer-Lambert law is used:
[tex]A=\varepsilon \times b\times C[/tex]
OR
[tex]A=\varepsilon \times b\times \frac{\text{Given mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (mL)}}[/tex]
where,
A = absorbance = ?
[tex]\varepsilon[/tex] = molar absorptivity = [/tex]15000m^2mol^{-1}L[/tex]
b = path length = 1 cm = 0.01 m (Conversion factor: 1 m = 100 cm)
Given mass of [tex]\beta-[/tex] carotene = 0.1 mg = 0.0001 g (Conversion factor: 1 g = 1000 mg)
Molar mass of [tex]\beta-[/tex] carotene = 536 g/mol
Volume of solution = 10 mL
Putting values in equation 1:
[tex]A=15000\times 0.01\times \frac{0.0001\times 1000}{536\times 10}\\\\A=0.0028[/tex]
Hence, the absorbance for a solution is 0.0028
What is the molar solubility of MgF2 in a 0.36 M Mg(NO3)2 solution? For MgF2, Ksp = 8.4 × 10^–8
Answer:
2.4 × 10⁻⁴ M
Explanation:
Step 1: Calculate the concentration of Mg²⁺ coming from Mg(NO₃)₂
Mg(NO₃)₂ is a strong electrolyte and the molar ratio of Mg(NO₃)₂ to Mg²⁺ is 1:1. The initial molar concentration of Mg²⁺ is 1/1 × 0.36 M = 0.36 M.
Step 2: Make an ICE chart for the solution of MgF₂
MgF₂(s) ⇄ Mg²⁺(aq) + 2 F⁻(aq)
I 0.36 0
C +S +2S
E 0.36+S 2S
The solubility product constant is:
Ksp = [Mg²⁺] × [F⁻]² = (0.36+S) × (2S)²
Since S <<< 0.36, 0.36+S ≈ 0.36.
Ksp = 0.36 × 4S² = 8.4 × 10⁻⁸
S = 2.4 × 10⁻⁴ M
When optically active (R)-2-methylcyclohexanone is treated with either aqueous base or acid, racemization occurs. Explain.
Answer:
See explanation
Explanation:
Racemization is said to occur when a 1:1 ratio of (+) and (-) enantiomers of a compound are produced in a reaction.
The reaction of optically active (R)-2-methylcyclohexanone with either aqueous base or acid leads to the formation of a planar enol species for reaction with acid and a planar enolate species for reaction with base.
Both reactions involves the formation of achiral species which reverts back to the chiral product with equal chances of the formation of both enantiomers of the product during the process. This leads to racemization of the product in both cases.
Racemization of the optically active (R)-2-methylcyclohexanone results from the production and subsequent interconversion of intermediates during the reaction with an aqueous base or acid. This is due to the inversion of stereochemistry at the chiral centre.
Racemization can happen when an optically active molecule is exposed to an aqueous base or acid because the compound's enantiomers are interconverted. The carbon-carbon bond next to the carbonyl group in (R)-2-methylcyclohexanone breaks as a result of the chemical reaction with the aqueous base or acid. The creation of the negatively charged intermediate known as the enolate ion occurs when a base, such as hydroxide ions, is present and attacking the carbonyl carbon. The carbonyl group can then be reformated by this enolate ion after it has undergone a nucleophilic attack on a proton.
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At STP, which gaseous sample has the same number
of molecules as 5.0 liters of O2 (g)?
A) 6.0 L of F2 (g)
C) 3.0 L of H2 (g)
B) 4.5 L of O2 (g)
D) 5.0 L of Cl2 (g)
For each system listed in the first column of the table below, decide (if possible) whether the change described in the second column will increase in GPS of the system, decrease S, or leave S unchanged. If you don’t have enough information to decide, check the “not enough information“ button in the last column. Note for advanced students: you may assume ideal gas and ideal solution behavior.
Answer:
For each system listed in first column of the table below, decide (if possible) whether the change described in the second column will increase the entropy S of the system, decrease S , or leave S unchanged. If you don?t have enough information to decide, check the not enough information button in the last column
