Answer:
0.0899 moles of oxygen (O2).
Explanation:
What is given?
Mass of sodium oxide (Na2O) = 11.15 g.
Molar mass of Na2O = 62 g/mol.
Step-by-step solution:
First, let's state the balanced chemical equation:
[tex]4Na+O_2\rightarrow2Na_2O.[/tex]Let's calculate the moles of Na2O that are in 11.15 g of Na2O, using its molar mass:
[tex]11.15\text{ g Na}_2O\cdot\frac{1\text{ mol Na}_2O}{62\text{ g Na}_2O}=0.1798\text{ moles Na}_2O.[/tex]Now that we have the moles of Na2O, let's do the stoichiometry: you can see in the chemical equation that 1 mol of oxygen (O2) reacted produces 2 moles of Na2O, so by doing a rule of three based on this data, the calculation will look like this:
[tex]0.1798\text{ moles Na}_2O\cdot\frac{1\text{ mol O}_2}{2\text{ moles Na}_2O}=0.0899\text{ moles O}_2.[/tex]The answer is that we need 0.0899 moles of oxygen (O2) to produce 11.15 g of sodium oxide.
2. Which of the following is a renewable resource? *
A. Air
B. Fossil Fuels
C. Minerals
Answer:
a) Air
Explanation:
Air from the following is a renewable resource, fossil fuels and minerals cannot be renewed. Hence, option (a) is correct.
3.Which of the following isotopes should be expected to be radioactive?Select one:a. Ab. Bc. Cd. D
Explanation:
To find the isotope that is expected to be radioactive we have to compare the given isotopes with the ones that we find the in the periodic table.
(A) Ti:
Isotope ----> atomic mass = 48 atomic number = 22
Periodic table ---> average atomic mass = 47.9 atomic number = 22
(B) Sr:
Isotope ----> atomic mass = 88 atomic number = 38
Periodic table ---> average atomic mass = 87.6 atomic number = 38
(C) Os:
Isotope ----> atomic mass = 192 atomic number = 76
Periodic table ---> average atomic mass = 190.2 atomic number = 76
(D) Pu:
Isotope ----> atomic mass = 244 atomic number = 94
Periodic table ---> average atomic mass = 244 atomic number = 94
If we take a look at them we will see that the only one that is different is osmium. The atomic mass of the isotope is 192 amu, that means that this isotope has 2 more neutrons than the average atom of the element. So we can expect that it could be radioactive.
Answer: C. Os
Which of the following describes how difficult it is to remove a valence electron from an atom of a particular element?
A: Electron Affinity
B: Ionization energy
C: Atomic Radius
D: Electronegativity
Answer:
B: ionization energy
Explanation:
what is the total number of electron-pair domains (electron clouds) around the central atom in the sulfur tetrafluoride molecule? enter your answer as a numeral without leading or lagging spaces. g
Total number of electron-pair domains (electron clouds) around the central atom in the sulfurtetrafluoride molecule is five. which includes 4 bond pair 1 loan pair.
what is electron pair domain?An atom's electron domain is the number of lone pairs or chemical bond locations that surround it. It represents the number of locations expected to contain electrons. By knowing the electron domain of each atom in a molecule, you can predict its geometry.
“The electron geometry describes the spatial arrangement of a molecule’s bonds and lone pairs. VSEPR theory can be used to calculate electron geometry.”
The term electron geometry is the name of the electron pair/groups/domains on the central atom, whether they are bonding electrons or non-bonding electrons. Electron pairs are electrons that exist in pairs or bonds, as lone pairs or as a single unpaired electron. Because electrons are always in motion and their paths cannot be precisely defined, the electron arrangement in a molecule is described in terms of an electron density distribution.
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an aqueous solution contains 0.25 m potassium nitrite. one liter of this solution could be converted into a buffer by the addition of:
One liter of this solution could be converted into a buffer by the addition of 0.25mol NH₄Cl, and 0.12 mol HCl.
A buffer is a substance that can withstand a pH change when acidic or basic substances are added. Small additions of acid or base can be neutralized by it, keeping the pH of the solution largely constant. For procedures and/or reactions that call for particular and stable pH ranges, this is significant. The pH range and capacity of buffer solutions determine how much acid or base can be neutralized before pH changes and how much pH will vary.
A weak acid and its conjugate base, or vice versa, are combined in solution to form a buffer.
The conjugate base of ammonia (NH3), which is a weak base, is NH4+. Therefore, adding 0.25 mol of NH4Cl will change the solution into a buffer. Additionally, NH3 and HCl interact to form NH4+. Therefore, 0.12 mol of HCl added will result in NH4+. All of the NH3 is consumed by 0.25 mol HCl.
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which of the following molecules is/are produced by translation? include molecules that are subject to further modification after initial synthesis. select all that apply. which of the following molecules is/are produced by translation? include molecules that are subject to further modification after initial synthesis.select all that apply. the amino acid glycine rna polymerase aminoacyl-trna synthetase
Aminoacyl-tRNA synthetase and RNA polymerase are produced by translation.
Generally speaking, translation is the process of changing something from one form to another, such as a word from one language to another. In biology, translation is a process in which a strand of mRNA's genetic code is decoded to create a specific sequence of amino acids. It happens on the ribosomes in both prokaryotes and eukaryotes. However, in eukaryotes, it takes place on ribosomes that are attached to the surface of the endoplasmic reticulum (ER), allowing the newly formed protein to undergo additional maturation inside the ER after translation and then be labeled in the Golgi apparatus for transport inside or outside the cell. Both prokaryotes and eukaryotes go through the same basic translational process.
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How many grams of sodium hydroxide (NaOH) do you need to make 6.5 L of 1.0M solution?
260grams
Explanations:The formula for calculating the moles of NaOH is expressed as
[tex]\begin{gathered} moles=molarity\times volume \\ moles\text{ of NaOH}=1.0M\times6.5L \\ moles\text{ of NaOH}=6.5moles \end{gathered}[/tex]Determine the required mass of NaOH
[tex]\begin{gathered} Mass\text{ of NaOH}=moles\times molar\text{ mass} \\ Mass\text{ of NaOH}=6.5\cancel{moles}\times\frac{40g}{\cancel{mole}} \\ Mass\text{ of NaOH}=260grams \end{gathered}[/tex]Hence the grams of sodium hydroxide (NaOH) you need to make 6.5 L of 1.0M solution is 260grams
Where would one find the s-block, p-block, d-block and f-block elements on the periodic table?
Answer:
You can find p-block elements on the periodic table in groups 13 to 18, you can find the s-block on the periodic table in group 1, Group 3 through Group 12 are d-block elements, and The f-block elements, found in the two rows at the bottom of the periodic table, are called inner transition metals and have valence electrons in the f-orbital's.
Explanation:
Hope this helps!
What is the empirical formula of a compound composed of 81. 71% c and 18. 29% h by mass?.
Which of the following units is used when measuring electrical power?
Answer:
Joules/sec and watts.
Explanation:
1 Joule/sec is a rate of energy expending every second. It is equal to a watt, the English term.
15. Which of the following elements will have the most similar properties?
C. Helium and Hydrogen
D. Magnesium and Calcium
A. Helium and Carbon
B. Magnesium and Iron
The elements that showcase the most similar properties are Magnesium and Calcium due to having the same valency.
Helium and Hydrogen
Helium and Hydrogen are two completely different elements. Hydrogen forms various compounds with other elements, water H2O, Ammonia NH4, and carbohydrates C6H12O6 whereas Helium being a noble gas is a stable element that contains 8 electrons in its valence shell, i.e. the ideal amount and so does not react with other elements to make compounds.
Magnesium and Calcium
Magnesium and calcium have similar properties as they both contain only 2 electrons in their valence shell. Since all chemical properties are in one way or another dependent on valency, they display similar behavior.
Helium and Carbo
Helium a noble gas contains 8 electrons in its valence shell causing it to have no need to react with other elements. Thus Helium does not form any compounds whereas Carbon on the other hand containing 4 electrons in its valence shell is among the best elements for chain compounds. Due to carbon's ability to accept and donate the same amount of electrons as well as sharing electrons, it is the major element in all biotic materials.
Magnesium and Iron
Magnesium contains 2 electrons in its valence shell and has a tendency to lose them to attain Mg2+ ion. Magnesium has a set valency whereas Iron has multiple vacancies. Depending on the state of Iron it may exhibit a valency of 2 or 3. Due to Iron having a valency of 3 as well as 2 it differs from Magnesium in its chemical properties.
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If the concentration of reactants is decreased, how is the reaction rate affected?A.) the reaction rate decreasedB.) the reaction rate can increase or decreaseC.) the reaction rate does not changeD.) the reaction rate increases
Answer:
A.) The reaction rate decreased.
Explanation:
Let's review the rate law based on the effect on concentration on reactions: typically, reaction rates decrease with time because reactant concentrations decrease as reactants are converted to products. Reaction rates generally increase when reactant concentrations are increased.
Based on this logic, the reaction rate when the concentration of reactants is decreased, this would have a decreased too. The answer would be A.) The reaction rate decreased.
can someone please help? :(
Sigma bonds are single bonds formed by the head on collision between orbitals and pi -bonds are double bonds or triple bonds which are weaker than sigma bonds. There are 7 sigma bonds and one pi bond in acetic acid.
What is acetic acid?Acetic acid is a weak organic acid formed from methane croup. Its diluted form as vinegar is used as preservatives. Acetic acid contains the COOH acidic group. Where the C=O group is called carbonyl group.
A sigma bond is formed between head on overlap of two orbitals. It is more strong and forms single bonds. Pi bonds are formed by the sidewise overlapping of p orbitals. They are weak. In a double bond such as in C=O group one bond is pi bond and one is sigma bond.
First carbon in acetic acid forms sigma bonds with 3 hydrogens and one carbon and the second carbon has a sigma bond with an OH group. Thus there a total of 7 sigma bonds and 1 pi bond.
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What type of nuclear radiation is given off in the nuclear reaction below?
35/16S→35/17Cl
Answer:
Beta radiation
Explanation:
we know the three types of nuclear radiation:
alpha beta gammaokay so first look at the mass number of both the product and reactant, we notice that the mass number for both remains 35.
immediately we can cross of the possibility of it being alpha radiation because an alpha particle is similar to that of helium nucleus, hence if it was alpha, the mass number of Cl would be 4 less.
now look at the atomic number, we notice that moving from S to Cl it increased by 1 which can only mean it was beta radiation.
Beta radiation is when a neutron inside to nucleus turns into a proton and an electron, the electron is ejected from the nucleus hence it's a high speed electron.
neutron --> proton + electron
the reason the mass number is the same is because a neutron and proton has a mass of 1 whilst the electron is too small to cause much change.
the reason for nuclear decay is mainly because the elements want to achieve more stability.
A student proposed the Bohr model below for sodium (Na). Is this student’s model correct? Justify your answer
The Bohr model is a representation of the electronic configuration of the atom. According to this model, each energy level can hold a certain number of electrons. In the first energy there can only be 2 electrons, in the second and the following energy levels there can be a maximum of 8 electrons.
Sodium, Na which has 11 electrons in total so in the first level it will have two electrons, in the second level it will have 8 electrons and in the third level it will have the missing electron.
In the model proposed by the student, the electrons are represented in blue. The model proposed by the student is incorrect.
We see that in the second energy level he drew 9 electrons, this is incorrect since from the second energy level there can only be 8 electrons, the remaining electron must be located in the third energy level.
Where can people get the chemical
potential energy stored by plants?
People get the chemical potential energy stored by plants is solar energy in sugar
Chemical energy is stored in the bond that connect atom with other atom and molecule with other molecule and because chemical reaction takes place the stored chemical energy is released and plant store this solar energy as chemical energy in sugar means glucose within cell in leaves called as chloroplast and these cells are full of chlorophyll that help absorbs light
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Question 1 (0.75 points)
The endocrine system, producer of hormones which are chemical messengers work
with the nervous system to control many different body functions such as
metabolism and growth.
True
or
False
The endocrine system, producer of hormones which are chemical messengers work with the nervous system to control many different body functions such as metabolism and growth is True.
What is endocrine system ?The endocrine system is a communication system that uses feedback loops to control distant target organs by controlling hormones secreted by internal glands of an organism directly into the circulatory system.
All endocrine systems in vertebrates are controlled neurally by the hypothalamus. Among the endocrine glands are: Two organs called the adrenal glands sit on top of the kidneys and secrete the stress hormone cortisol.
The pituitary gland receives instructions from the hypothalamus in the lower middle brain about when to release hormones. The female reproductive system's ovaries, which release eggs and sex hormones.
Thus, the endocrine system, producer of hormones which are chemical messengers work with the nervous system to control many different body functions such as metabolism and growth is True.
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pls answer question will mark brainliset tyty
In these given options, flooding is most likely to reduced human population.
Humans are affected by floods in a variety of ways, including: flooding can cause injury or death to individuals. Sewage is frequently present in floodwater, which can compromise clean drinking water and cause disease. Power supply may become unstable.Environmental stress is a term that refers to a variety of circumstances, such as food shortages, predator activity, and other density-dependent variables, that cause population growth to slow down.Therefore, the infrastructure in our environment and the ecosystem itself may be harmed by severe flooding. They can first demolish houses and render them inhabitable. Additionally, they can clear farms of sand, which makes it harder to cultivate crops. In addition to the aforementioned, flooding taints clean water, resulting in illnesses.
Limiting variables prevent populations from growing either through increased death rates or emigration, decreased birthrates or immigration, or a combination of these factors.
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Gas X has the molecular formula C5Hx. A mass of 1.44g X occupies a volume of 0.32 dm*3 at 2 atm and 400K. Find the value of x. [H=1; C=12; R =0.08 atm.dm3 K*-1.mol*-1]
The value of x in the gas C₅Hx is 12.
Calculation:-
PV = nRT
n = PV/RT
= 2 × 0.32 / 0.08 × 400
= 0.64 / 32
= 0.02
mole = mass/molar mass
molar mass = mass/ mole
= 1.44/0.02
= 72 grams.
C5Hx = 72
12 × 5 + x = 72
x = 72 - 60
x = 12
An ideal gas is a theoretical gas composed of many randomly transferring factor particles that aren't difficult to interparticle interactions. the best gasoline idea is beneficial because it obeys the precise gas law, a simplified equation of country, and is amenable to evaluation under statistical mechanics.
An ideal gas is described as one for which both the extent of molecules and forces between the molecules are so small that they have got no effect on the behavior of the gas. The real gas that acts almost like a really perfect gasoline is helium. that is due to the fact helium, in contrast to maximum gases, exists as an unmarried atom, which makes the van der Waals dispersion forces as low as viable.
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please help with these 5 questions if they physical or chemical as well as intensive or extensive i will be giving brainliest thank u
Before categorizing each of the properties into physical or chemical, intensive or extensive, we need to understand the terms:
Physical property: This is any characteristic that can be determined without changing the substance’s chemical identity.
Chemical property: This is any characteristic that can be determined by simply changing the molecular structure of a substance
1) For the property: Its melting point is 112 degrees Celcius is a Physical property and intensive since extensive property depends on the amount of matter being measured.
2) If a substance burns in a presence of oxygen, it is a chemical property since the molecular structure of the resulting compound will be changed. This is also an intensive property.
3) If a substance is yellow solid is a physical property since the first is the color yellow and solid shows the state of the element. Neither property implies that the substance is changing its composition. Therefore, both properties are physical properties. This physical property is Intensive properties since it does not depend on the amount of the substance present.
4) If the substance is combustible, it is a chemical property and intensive property
5) For the sample of a substance that measures 75cm^3, this is a Physical property since the volume of a substance can be determined without changing its identity. This is also an extensive property since examples of these properties include mass, weight, and volume.
Please answeeeerrr i neeed help look at imagine
Answer: D
Explanation:
3.Which term best describes algae?
The term which best describes algae is Single-celled organisms or unicellular organism.
What is an Algae?A broad and varied collection of photosynthetic eukaryotic organisms are collectively referred to as algae informally. It is a polyphyletic group that consists of species from various separate clades.
What do you mean by Single-celled organisms?A single cell makes up a unicellular creature, also referred to as a single-celled organism, as opposed to a multicellular organism, which is made up of numerous cells.
Hence, The term which best describes algae is Single-celled organisms or unicellular organism.
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pls answer question will mark brainliset tyty
Answer: A. The population is growing rapidly
What is the molecular formula of the compound?Express your answer as a chemical formula.
Answer:
[tex]C_2H_4[/tex]Explanation:
Here, we want to get the chemical formula for the compound
From what we have, the compound contains hydrogen and carbon only
We also were given that the molar mass is 28.06 amu
Now,we beed to get the individual atomic mass of carbon and hydrogen
From records, carbon has an AMU of 12.01
The AMU of hydrogen is 1.00794
Looking at the total value, we can see that the max possible number of atoms of carbon present is 2
Now, we need to know the number of hydrogen atoms
Let us call this n
Mathematically, we know that the AMU of the compound is the sum of the AMU of the individual atoms
Hence, we have it that:
[tex]\begin{gathered} 28.06\text{ = 2(12.01) + n(1.00794)} \\ 1.00794n\text{ = 28.06 - 24.02} \\ 1.00794n\text{ = 4.04} \\ \\ n\text{ = }\frac{4.04}{1.00794} \\ \\ n\text{ = 4} \end{gathered}[/tex]Finally, we want to write the molecular formula of the compound
The molecular formula is written with carbon first, followed by its number of atoms as subscript, then hydrogen , with its number of atoms as subscript
We have this written as:
[tex]C_2H_4[/tex]an aqueous solution contains 0.32 m hypochlorous acid. one liter of this solution could be converted into a buffer by the addition of:
One liter of 0.3 M HClO can be combined with 0.31 mol of KClO to create a buffer solution.
A weak acid, a base, and its corresponding salt make up a buffer system. The Henderson-Hasselbach equation, which is the same, can be used to determine the pH of the buffer.
pH is calculated as pKa + log ((Salt/Acid)).
A hypochlorous acid buffer in the illustration should contain the hypochlorous acid salt, which might be potassium hypochlorite. Because the perchloric acid ion is absent, potassium perchlorate is not a buffer.
Nitric acid and sodium hydroxide are also powerful acids and bases, respectively. They cannot partially ionize, which is necessary for a buffer, as a result. The importance of this partial ionization is because it is what causes the buffer to keep the pH of the solution constant when an acid or base is added. Strong bases and acids are ineffective as buffers.
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How can she test this idea in the Flowing Water Model?
She test this idea in the Flowing Water Model through integrated water flow model
Flowing water model is the computer programmed for simulating water flow through the integrated land surface water and groundwater flow systems and hydroelectric energy is power made by the moving water and water always flow downhills because of gravity and she She test this idea in the Flowing Water Model through integrated water flow model
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State the worded equation for the reaction that occurred in a beaker when copper is placed in a beaker of silver nitrate.
The reaction of silver nitrate with copper is a substitution reaction. We have copper in its free state, Cu, and we have silver nitrate which has the formula AgNO3. The copper replaces the silver obtaining the following reaction:
[tex]2AgNO_{3(aq)}+Cu_{(s)}\rightarrow Cu(NO_3)_{2(aq)}+2Ag_{(s)}[/tex]The products obtained are copper nitrate and silver.
The word equation will be:
[tex]SilverNitrate+Copper\rightarrow Copper(II)Nitrate+Silver[/tex]what is the molarity of the solution if the mole fraction of ethanol in water is 0.2 ?
Answer: 2.1M
Explanation:
Hence, the molarity of a solution of ethanol in water is 2.1M.
draw structures corresponding to the following names: (a) phenyl benzoate (b) n-ethyl-n-methylbutanamide (c) 2,4-dimethylpentanoyl chloride (d) methyl 1-methylcyclohexanecarboxylate (e) ethyl 3-oxopentanoate (f ) methyl p-bromobenzenethioate (g) formic propanoic anhydride (h) cis-2-methylcyclopentanecarbonyl bromide
Option g. formic propanoic anhydride.
Propionic anhydride is an organic compound with the system CH₃CH₂CO₂O. This easy acid anhydride is a colorless liquid. it is a broadly used reagent in natural synthesis in addition to producing distinctive derivatives of cellulose.
Propionic Anhydride is a colorless liquid with a very sturdy, unpleasant smell. it's far used in the manufacture of perfumes, oils, resins, dyestuffs, drugs, and cellulose esters.
Anhydrides react with alcohols to form esters as the main product and carboxylate as a facet product. The response is generally run with a base, such as NaOH or pyridine, to take away any acid produced.
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is hydrogen Anion or Cation
Answer:
Hydrogen is a Cation, the only cation that has no electrons.
¿Is hydrogen Anion or Cation
A Hydrogen, it is well known that it is a Cation, since it is a positively charged particle.
¿What is hydrogen?A Hydrogen is a chemical element, which is the lightest that exists, its atom is made up of a proton and an electron and it is stable in the form of a diatomic molecule (H2).
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