Answer:3.381 X 10^(-11)
Explanation:
The formula for buoyant force is F = -Volume*density*gravitational acceleration. Convert volume and density to SI units and then apply them in the formula where gravitational acceleration is 9.8m/s^2. Done
What advantages exist when using the balloons to model molecular shapes verses using model kits?.
Balloons can be used to mimic the morphologies of covalently bound chemical molecules. Many students struggle to visualize the shapes. The balloons are superior (and less expensive) than typical ball and stick model kits. The balloons in this exercise represent pairs of electron-electron clouds, not atoms.
Each balloon is an electron domain (either a bonded pair or a lone pair of electrons) that surrounds a core atom. When balloons are linked, they spontaneously adopt the lowest energy structure suggested by the VSEPR model.
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a certain compound is found to have the percent composition (by mass) of 85.63% c and 14.37% h. the molecular formula contains 6 carbon atoms. how many hydrogen atoms are contained in a molecular of this compound?
A molecular of this compound contains 6 hydrogen atoms. An atom is a component of an element. Each atom in a specific element has only one type of atom. Electrons, protons, and neutrons
What is meant by atom?An atom is the smallest component of ordinary matter that makes up a chemical element. Every solid, liquid, gas, and form of plasma is made up of neutral or ionized atoms. Atoms are extremely small, with a diameter of 100 picometers on average.A chemical element is defined by its atoms, which are small pieces of matter. An atom consists of a core nucleus and one or more negatively charged electrons that orbit around it. The positively charged, somewhat massive protons and neutrons that comprise the nucleus may exist.The modern atomic concept was first proposed by eminent chemist John Dalton (1766–1844). But his atom was as solid as a cue ball.To learn more about atom, refer to:
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are plants and animals ph sensitive?
Answer:
yes, they are ph sensitive
Explanation:
Plants and animals are known to show growth sensitive to pH. pH is known as the hydrogen ion concentration of a solution. For example, plants are known to be growth sensitive to the pH of the soil. Plants need an optimum pH of soil for their growth, hence, showing growth dependence on soil pH.
Which set of numbers will balance the following equations? 1's have been included for clarity.__Mn3N4 + __NaF --> __MnF4 + __Na3N a 1; 4; 1; 4 b 1; 4; 3; 2 c 1; 12; 3; 4 d 3; 2; 3; 2
ANSWER
Option C
EXPLANATION
Given that;
[tex]\text{ ----- Mn}_3N_4\text{ }+\text{ ---- NaF }\rightarrow\text{ ---- MnF}_4\text{ }+\text{ ---Na}_3N[/tex]In the reaction above, we have the following data
At the reactants side;
3 atoms of manganese
4 atoms of nitrogen
1 atom of sodium
1 atom of fluorine
At the products side
1 atom of manganese
4 atoms of fluorine
3 atoms of sodium
1 atom of nitrogen
To balance the above equation, apply the law of conservation mass
Law of conservation of mass states that matter can neither be created nor destroyed but can e transformed from one formato another.
To balance the equation, 1 mole of Mn3N4 reacts with 12 moles of Na Tto give 3 moles of MnF4 and 4 moles of Na3N
So, the new equation becomes
[tex]\text{ Mn}_3N_4\text{ }+\text{ 12NaF }\rightarrow\text{ 3MnF}_4\text{ }+\text{ 4Na}_3N[/tex]The following data can be deduced in the above equation
At the reactants side
3 atoms of Mn
4 atoms of N
12 atoms of Na
12 atoms of F
At the products side
3 atoms of Mn
12 atoms of F
12 atoms of Na
4 atoms of N
Looking atthe vabove data, the number of atoms of each element at the reactants side is equal to the number of atoms of same elements at the products side.
Hence, the correct answer is option Ce
u
PLEASE SOMEONE HELP EXPLAIN THIS IT’S DUE FIRST THING TMRW MORNING!!
Determine the empirical formula of a 28.00 gram sample containing 22.90 grams carbon and 5.10 grams hydrogen.
Answer:
CH3
Explanation:
Hope this helps :)
Prior to the industrial revolution, what was the previous highest level of co2 concentration in the atmosphere over the prior 400,000 years?.
Prior to the industrial revolution, the previous highest level of CO2 concentration in the atmosphere over the prior 400,000 years was 300 ppm.
Before the Industrial revolution, the carbon dioxide concentration in the atmosphere was lesser as there was not much carbon dioxide waste that was produced. The highest level of carbon dioxide recorded in the air was 300 ppm at that time.
After the industrial revolution, the concentration of carbon dioxide increased. We can see the carbon dioxide concentrations to reach as high as 1.5 trillion tons today. This is because the formation of industries has been increasing since then which produces a lot of waste carbon dioxide.
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A substance made up of only one kind of atom is called
A substance made up of only one kind of atom is called Elements.
An element is a pure substance made up of only one kind of atom. A compound is substance made up some of more than one element. in some of the elements atoms are joined in groups of two or more called as molecule . example : oxygen is an element made up of only one kind of atom that is oxygen atoms. there are 118 known elements , and are represented on the periodic table.
Thus, A substance made up of only one kind of atom is called Elements.
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when a condensed fuel, such as a candle or a pool of gasoline, burns, a portion of the heat of the gaseous flame is transferred to the fuel, causing it to gasify. when this gasification occurs without chemical decomposition of the molecules, it is:
The process of gasification that occurs without the chemical decomposition of the molecules is pyrolysis.
Pyrolysis is the process of heating substances especially organic materials in absence of oxygen as oxygen is not involved combustion does not occur rather a biomass thermally decomposes into combustible gases and other products.
when condensed fuel such as a candle or pool of gasoline burns the heat produced makes them convert into smaller fragments in absence of air through the application of heat.
The heat produced is responsible for gasification and responsible for thermal combustion without the usage of oxygen making them remain than combustion over oxygen which ensures complete decomposition.
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can some one please answer these chemistry questions
What is the density of an object with a mass of 24.6 g and a volume of 7.5 mL?
The density of an object is 3.52g/cc
What is density ?
The density of a substance indicates how dense it is in a given area. Mass per unit volume is the definition of a material's density. In essence, density is a measurement of how closely stuff is packed. It is a particular physical characteristic of a specific thing. The Greek scientist Archimedes made the discovery of the density principle. If you are familiar with the formula and the relevant units, calculating density is simple. Density is represented by the symbol, alternatively it can be written as the letter D.
d = M/V
d = density
M = mass
V = volume
d = 26.4/7.5 = 3.52g/cc
The density of an object is 3.52g/cc
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a penny having a mass of 2.5559 g was dissolved in 20 ml of 8 m hno3. the resulting solution was transferred to a 100.00-ml volumetric flask and diluted to the mark with water. this solution was found to have a concentration of 1.06 x 10-2m cu2 . what is the % by mass of copper in the penny?
For a penny having mass 2.5559g dissolved in hno3 and solving from the process as given in the question we get that the penny has 2.64% of copper (Cu) by mass in it
Mass of penny mp = 2.5559g
concentration of Cu in solution = 1.06 * 10^(-2) mol/L
therefore 100ml diluted solution has
n = 1.06*10^(-2) * 100 / 1000 = 1.06 * 10^(-3) mol of copper
The molecular weight of copper mw = 63.5 g/mol
mass of copper Mcu = n * mw(molecular weight of copper)
⇒Mcu = 1.6 * 10^(-3) mol * 63.5 g/mol
⇒Mcu = 0.06731 g
Percentage by mass of copper in the penny, P= (Mcu/ mp)* 100%
⇒ P = (0.06731/2.5559)* 100 %
⇒P = 2.64%
∴There is 2.64% copper by mass in the penny
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63.8 g of manganese(ii)sulfate monohydrate is heated in an oven until all the water is driven off. what is the mass of the anhydrous compound? provide your answer in decimal notation rounded to the appropriate number of significant figures.
The mass of anhydrous compound in 63.8 grams of manganese(ii)sulfate monohydrate is 57.01 grams.
As per the known fact, mass of manganese(ii)sulfate monohydrate is 169.02 grams/mole. Also, the mass of monohydrate which is one molecule of water is 18 grams/mole. So, the percentage of water in manganese(ii)sulfate monohydrate is 18/169.02×100
Percentage = 10.6%
Now, the amount of water in 63.8 grams of manganese(ii)sulfate monohydrate is : 10.6%×63.8
Calculating percentage
Amount of water = 6.79 grams
Mass of anhydrous compound = 63.8 - 6.79
Performing subtraction on Right Hand Side
Mass of anhydrous compound = 57.01 grams
Thus, 57.01 grams is present in mentioned salt.
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most of the triose phosphate produced by the calvin cycle is used to regenerate rubp, which is the first reactant in the cycle. what output of the light reactions is directly required for the regeneration steps?
Adenosine triphosphate is directly required for the regeneration steps.
What is Adenosine Triphosphate?
Adenosine triphosphate (ATP) is the source of energy for use and storage at the cellular level. The structure of ATP is a nucleoside triphosphate, consisting of a nitrogenous base (adenine), a ribose sugar, and three serially bonded phosphate groups.
What is Calvin cycle?
The Calvin cycle, light-independent reactions, bio synthetic phase, dark reactions, or photosynthetic carbon reduction cycle of photosynthesis is a series of chemical reactions that convert carbon dioxide and hydrogen-carrier compounds into glucose.
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Metal and non-metal ions come together to form a giant structure. What is the name of this structure?
A. Ionic bond
B. Ionic lattice
C. Ionic molecule
Answer:
This arrangement is called a giant ionic lattice .
Forming ionic compounds -
Answer: It form ionic bond.
Explanation: It forms when atoms of a metallic element give up electrons to atoms of a nonmetallic element. Ionic bonds form only between metals and nonmetals. That's because metals “want” to give up electrons, and nonmetals “want” to gain electrons.
What might happen if the strong force didn't exist?
(B) Atomic nuclei would fly apart if strong force did not exist.
The nucleus occupies a small fraction of the atomic volume and contains the number of protons and neutrons characteristic of a particular isotope. Electrostatic repulsion forces normally cause positively charged protons to repel each other, but the nuclei do not fly off due to the strong nuclear force, the very strong but very short-range attraction between nucleons.
All stable nuclei except hydrogen have at least one neutron to overcome the electrostatic repulsion between protons. As the number of protons in the nucleus increases, the number of neutrons required for a stable nucleus increases even faster. If there are too many protons (or too few neutrons) in the nucleus, the forces will be unbalanced and the nucleus will become unstable.
Strong nuclear forces are sometimes simply called strong forces or strong interactions. This force is strong enough to overcome the repulsive force between her two positively charged protons, allowing protons and neutrons to stick together in an unimaginably small space.
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How many moles are in 175.9 g of Krypton?
Answer:
2.09 molesExplanation:
We can find the number of moles from the given mass of the element by using the formula
[tex]n = \frac{m}{M} \\ [/tex]
m is the mass
M is the molar mass
n is the number of moles
The molar mass of krypton is 84 g/mol
We have
[tex]n = \frac{175.9}{84} = 2.094\\ [/tex]
We have the final answer as
2.09 molesHope this helps you
avogadro's law states that under constant temperature and pressure, the volume of a gas is directly proportional to the number of moles of gas. what is the relationship consistent with this statement?
According to Avogadro`s law, the volume of gas is directly proportional to number of moles of gas.
This law mathematically can be written as:
V ∝ n
V = K n
V/n = K
Where V represents the volume of gas
n represents the number of moles of gas
k is proportionality constant at a given temperature and pressure
This law explains that how equal volumes of all gases contain the same number of molecules when the temperature and pressure are the same. Similarly, this law can be used to compare the same substances under two different sets of circumstances.
V₁ / n₁ = V₂ / n₂
This equation shows that the volume of the gas increases proportionally to the amount of number of moles of gas. Similarly, if the amount of gas decreases result in decrease in number of moles. As a result, neither the size of the molecules nor the molar mass of the gas affects how many atoms or molecules there are in a given volume of an ideal gas.
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1. Aqueous lead(II) nitrate and aqueous potassium iodide are added to a dish containing water, as
shown.
aqueous lead(II) nitrate aqueous potassium iodide
yellow precipitate
A yellow precipitate forms after a few minutes.
Which process occurs before the precipitate forms?
A diffusion
B distillation
C fermentation
D filtration
When aqueous lead (II) nitrate and aqueous potassium iodide are added to a dish containing water, diffusion occurs before the formation of yellow precipitate.
Diffusion is a process involving the movement of molecules to the region of lower concentration from the region of higher concentration.
When aqueous lead (II) nitrate and aqueous potassium iodide are added to a dish containing water, the compounds would dissociate into ions. Immediately after the dissociation, the ions would start to diffuse through the molecules of water to lower concentration.
After diffusion, the yellow compound lead iodide would form from the reaction between iodide ions in potassium iodide and lead ions from lead nitrate. The yellow compound would later precipitate out of the solution.
The reaction involved between the compound result in potassium nitrate and lead iodide
Lead nitrate (aq) + Potassium iodide (aq) → Lead iodide (yellow precipitate) + Potassium nitrate
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Which of the following is an example of demonstrative evidence?
O Gun
O Fingerprint
O Handwritten note
O Model of crime scene
A pure yellow crystalline substane, when heated in a vacuum, releases a greenish gas and a red powder. Is the original yellow crystalline substance a compound or element?
Answer:The yellow crystalline substance is a compound. The green gas and red powder are elements.
Explanation
Elements and compounds are considered pure substances. Elements are made up of a single type of atom while compounds are composed of two or more elements. One example of a compound is the table salt (NaCl) which is made up of one atom of sodium and one atom of chlorine. The elements in the compound are combined chemically and there is a definite ratio of these elements. They are formed by a chemical reaction where chemical bonds are formed. Furthermore, the components of the compound can be separated through several means such as extraction, distillation, etc. The process of heating the yellow crystalline substance resulted in the separation of its components namely, the green gas and red powder.
Please help with this question!
Draw and label a diagram of an electron in an atom taking in energy (being "excited")
from light and then dropping in energy ("relaxing") and emitting light as a color.
A negatively charged core nucleus and one or more orbiting electrons make up an atom. There may be the positively charged, somewhat massive protons and neutrons that make up the nucleus. Atoms are the basic building blocks of stuff.
Explain about the electron in an atom?In a neutral atom, there are exactly as many electrons as protons. The total number of protons and neutrons in the atom's nucleus is equal to the mass number (M) of the atom. The difference between the atomic number and the mass number of the atom (M) is equal to the amount of neutrons (Z).
Absorption is the process by which an atom transitions from its ground state to an excited state by absorbing energy from its environment. After absorbing the energy, the electron advances to a higher energy state. Up the opposite process, called emission, the electron releases the excess energy it had taken in and goes back to its ground state.
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How many moles of nitrogen, N , are in 67.0 g of nitrous oxide, N2O ?
Considering the chemical formula, 3.045 moles of nitrogen N are in 67.0 g of nitrous oxide, N₂O.
Chemical formulaChemical formulas use letters and numbers to represent chemical species. The letters are called chemical symbols and represent the elements present in the chemical species.
The numbers located to the right of each chemical symbol is a subscript that indicates the number of moles of the element present in that compound. If no subscript appears after a chemical symbol, this implies that there is only one atom of that element.
Moles of nitrogenThe molar mass of N₂O is 44 g/mole. If the molar mass is the amount of mass that a substance contains in one mole, this means that 1 mole of N₂O contains 44 grams of the compound.
On the other hand, 1 mole (or 44 grams, according to the definition of molar mass) of N₂O contain 2 moles of N. So, you can apply the following rule of three: if 44 grams of the compound contains 2 moles of N, 67 grams of the compound contains how many moles of N?
amount of moles of N= (67 grams× 2 moles of N)÷ 44 grams
amount of moles of N= 3.045 moles
Finally, there is 3.045 moles of N.
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silver is often extracted from ores such as k[ag(cn)2] and then recovered by the reaction (a) how many molecules of zn(cn)2 are produced by the reaction of 35.27 g of k[ag(cn)2]? (b) what mass of zn(cn)2 is produced?
a.) 5.34102 Zn(cu)2 molecules are formed.
b.) The mass of Zn(cu)2 formed is 10.41 g at 117.44 g/mol
The entire numbers next to each component of the reaction should be noted because they will be necessary for the stoichiometric calculations that follow:
K[ag(CN)2] has a molar mass of 199 g/mol.
Zn(Cn)2 has a molar mass of 117.44 g/mol.
6.022 x 1023 molecules per mole is Avogadro's number.
a.)
35.27 g* (199 g/1 mol) x (1 mol Zn(Cn)2/ 2 mol K[Ag(CN)2]) x
(6.0221023 molecules/mol) = 5.341022 Zn(Cn)2 molecules.
b.)
35.27 g x (199 g/1 mol) x (1 mol Zn(Cn)2/ 2 mol K[Ag(CN)2]) x
Zn(Cn)2 equals 10.41 g at (117.44 g/mol).
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From ores like k[ag(CN)2], silver is frequently removed before being recovered by reaction and 5.34102 Zn(Cu)2 molecules are formed and the masses of Zn(Cu)2 formed is 10.41 g at 117.44 g/mol.
It is important to take notice of the whole numbers next to each reaction component because the following stoichiometric calculations will require them:
The molar mass of K[ag(CN)2] is 199 g/mol.
The molar mass of Zn(Cn)2 is 117.44 g/mol
Avogadro's number is 6.022 x 1023 molecules per mole.
a.) 35.27 g* (1 mol Zn(Cn)2/ 2 mol K[Ag(CN)2]) x (199 g/1 mol) x
5.341022 Zn(Cn)2 molecules =
6.0221023 molecules/mol.
b.) 35.27 g x (1 mol Zn(Cn)2/ 2 mol K[Ag(CN)2]) x (199 g/1 mol) x
10.41 g of Zn(Cn)2 are,
= 117.44 g/mol.
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Question 5(Multiple Choice Worth 2 points)
(14.01 LC)
What is the function of the outer covering in fish?
Answer:
Protects the fish from their environment.
Explanation:
Fish have a mucus on their outer covering that is very slimy and slippery; this serves as a benefit for the fish that will allow it to swim more easily in water.
It also works as a little suit of armor for the fish to protect themselves against predators.
if use a sepratory funnel containing a phenol with methylene chloride and an nahco3, where will the phenol be located? the answer is organic and bottom layer, but why is that and how do we answer similar questions?
phenol does not react with NaHCO3 , phenol solubility in water is very less about 8g in 100mL of water , so it will be present in organic layer (methylene chloride) , methylene chloride has a density of 1.33g/mL greater than water so it will be below layer in which phenol is present.
What is the function of separatory funnel?Immiscible liquids are separated using a separatory funnel, or sep funnel. Two layers appear in a separatory funnel when two immiscible liquids are added. The lower layer will be made up of the denser solvent. Most halogenated solvents are less dense than water, but most non-halogenated solvents are.
A separating funnel is used by adding the two phases and the mixture to be separated via the top while keeping the stopcock at the bottom closed. After then, the funnel is shut and gently shaken by being inverted several times. If the two solutions are combined too vigorously, emulsions will form.
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Jane is conducting an experiment on whether different colored light bulbs have an effect on the number of flower buds on a plant. explain how her experiment should be counducted.
The experiment should be conducted by Jane for several days and the observation of each light and its effect on the plant buds should be noted carefully.
To conduct this experiment, first, place a flowering plant in a place that receives that receive optimum sunlight. This is because this experiment is to be conducted at night time to observe the changes in the bud.
The plant should be watered and at the night, the plant should be placed under a colored light say let us take the blue colored light for the first week. The structure and shape of the bud should be noted in the initial time while placing the colored light after sunset and it should be noted before sunrise.
This observation should be noted for a week. For consecutive weeks, the colors of the light should be changed and the same observations are to be noted.
Later, from the observations inferred, the conclusion could be obtained if the plant and its bud have any effect on exposure to colored lights for several weeks.
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a certain reaction is known to be second order in species a. what is the numerical value of k (in m^-1s^-1), the rate constant, if the concentration of a decreases from 1.50 m to 0.367 m after 141.4 seconds? (give your answer to 3 sig figs)
The rate constant, if the concentration of a decrease from 1.50 m to 0.367 m after 141.4 seconds the numerical value of k = 0.01460.
A rate constant is a number that describes the relationship between the rate of a chemical reaction and the molar concentration of the reactants. We can learn about the variables that affect a reaction's rate by looking at its rate constant. We can determine the dependence of the molar concentration of the reactants on the rate of reaction by knowing the rate constant.
The abundance of a constituent divided by the sum of the mixture's volumes is the definition of concentration in chemistry. There are several different categories of mathematical description: mass concentration, molar concentration, number concentration, and volume concentration. notably the state of concentration turning the focus on a single thing My focus is being disturbed by all that noise.
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Name the following covalent bond Ch4
Answer:
sp³-s sigma bond.
Hope that was the answer
are Index fossils useless or not useless why or why not? (25 pts)
Answer:
Useful
Explanation:
Index fossils are believed to be useful in correlating rock strata from widespread locations.▸ The collection of such fossils from different rock formations and layers enables the geologists to identify the layer of rock they were found in.
▸ They are also useful in dating and the study of geological formations which help scientists to get a clear understanding of the environment and the life forms that dwelt on the planet even hundreds of millions of years ago.
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in the rate law the exponents associated with the concentration of each reactant are referred to as the order of the reaction with respect to that reactant. why are we not able to use the stoichiometric coefficients in the balanced equation for the orders in the rate law?
A chemical reaction's rate and the concentrations of the reactants involved are correlated by an expression known as the rate law, commonly referred to as the rate equation.
In a rate law, what do the exponents stand for?The rate equation's "orders," the exponents a and b, must be established empirically. The exponents are added to determine the reaction's overall order. In other words, the reaction is third order overall if a=1 and b=2.
By adding together the different orders, the reaction's overall order can be determined. For instance, the overall order is 2 if the reaction is first order with regard to both A and B (a = 1 and b = 1). This is referred to as a global second order response.
Finding a Rate Law's Exponents from Initial Rates (Experimental Data)
The concentrations of all the species for which data are provided should be included in the rate law. ...Consider the experimental data's ratios for the various rates.Delete common phrases, then find the exponent that doesn't disappear.The molar concentrations of the reactants are used by the rate law to calculate the reaction rate. Because there are more molecules colliding and reacting with one another, reactions often proceed more quickly at higher reactant concentrations.
The exponents of a rate law's concentration terms are added to determine its order. The rate law of a reaction can be utilized to better understand the makeup of the reaction mixture once it has been established.
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