Answer:
Technically only AJ got it correct Howie got it wrong because rotting is a chemical not a physical change AJ was correct becuase he knew what would make the fruit go faster so yes howie would have been right if he got the right kind change.
Explanation:
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Who turned the ragged Continental Army into a more efficient fighting force?
Na2SO3" represents sodium sulfite. What does the 4 mean in the formula 4Na2SO3? There are four atoms of sodium. There are four atoms of sodium sulfite. There are four molecules of sodium sulfite. There are four elements in sodium sulfite. 7
The World on Turtle's Back" is a creation myth because it focuses on characters whom the Iroquois considered "gods. " is an Iroquoian story about people and animals who talk to each other. Explains how the Iroquois believe that the earth was created. Describes Iroquoian social and cultural values.
The designation "4" before Na2SO3 simply means that there are four molecules of sodium sulfite.
A molecule is formed when two or more atoms of the same or different elements come together. The formula of the molecule must reflect the number of atoms from which it is formed. The designation "4" before Na2SO3 simply means that there are four molecules of sodium sulfite.
The "The World on Turtle's Back" is a legend creation story. According to this story, the world was created on a giant turtle back. The folktale is common among the Iroquois Native Americans.
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Please answer any of these
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Synthetic fibers, like plastic, are derived from organic compounds. These fibers have been chemically changed by humans to last longer for better storage and more effective uses. These fibers are stronger than naturally occurring fibers like cotton and wool. Which of the following is a downside to these synthetic fibers when compared to natural fibers?
A.
The longer lasting material is more difficult to break down.
B.
The longer lasting material is less useful in manufacturing.
C.
The longer lasting material is not able to withstand high temperatures.
D.
The longer lasting material makes the fibers more expensive to buy.
The downside of this is that the longer lasting material is more difficult to break down.
Both natural fibers and synthetic fibers are polymer materials. Polymer materials are materials that are made by the agglomeration of small molecules called monomers.
The natural fibers are less long lasting than the synthetic fibers. The downside of this is that the longer lasting material is more difficult to break down. As a result of these, synthetic fibers lead to environmental pollution problems.
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Answer:
the longer lasting material is more difficult to break down.
Explanation:
20 PIONTS PLZ HELP
What mass of calcium chloride is needed to make 330.0 mL of 0.125 M
solution?
Answer:
4.58g
Explanation:
1.) What is the molar mass of CaCI2?
= 110.98 g/mol
2.) Find the mols
[tex]conc = \frac{mol}{volume(l)} [/tex]
conc × volume= mol
0.125 M x 0.33 L = 0.04125mol ( 330mL was converted to "L" by dividing 330 by 1000)
3.) The mass(g)
g= mol x atomic weight
g= 110.98g/mol × 0.04125
= 4.58 g
# NOTE M = mol/L
how long would it take to electroplate a flute with 28.3 g of silver (107.87 g/mol) at a constant current of 2.0 amps using AgNO3
It would take 211 hours to plate 28.3 g of silver on a flute.
The equation of the reaction;
Ag^+(aq) + e -----> Ag(s)
We know that 1 F of electricity is required to deposit 107.87 g of Ag. Also 1F = 96500 C
Now;
Since 107.87 g is deposited by 96500 C of electricity
28.3 g is deposited by 28.3 g × 96500 C/ 107.87 g
= 25317 C
Also;
Q = It
I = current
t = time
25317 C = 2.0 amps × t
t = 25317 C /2.0 amps
t = 12658.5 seconds or 211 hours
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Answer:
It would take [tex]3.5hrs[/tex] to electroplate the fluteExplanation:
Electrolysis equation is:
[tex]Ag1+ + 1e- ------> Ag[/tex]
1 mol of Ag requires 1 mol of electron
1 mol of electron = 96485 C
So,
1 mol of Ag requires 96485 C
let us calculate mol of element deposited:
molar mass of Ag = [tex]107.87 g/mol[/tex]
number of mol of Ag, [tex]n = \frac{mass of Ag}{molar mass of Ag}[/tex]
[tex]n = \frac{28.3}{107.87}\\\\n = 0.2623 mol[/tex]
[tex]total charge = mol of element deposited * charge required for 1 mol\\\\total charge = 0.2623*9.649*10^4\\\\total charge = 2.531*10^4 C[/tex]
Therefore,
[tex]time = \frac{Q}{i}\\\\= \frac{2.531*10^4}{2}\\\\= 1.265*10^4 seconds\\\\= 3.515 hr[/tex]
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Answer:
1) actual yield - 2.675 g
Theoretical yield - 4.0539 g
2)a) 41.257 g
b) 0.6857moles
c) 23 g
Explanation:
1)
Theoretical yield is the mass of the product that can obtain from the equation, it is not practical.
Theoretical yield:
Mr of SiO2 - 60
Moles of SiO2 - 2.339/60 = 0.03898 moles
Mr of SiF4 - 104
Mass of SiF4 - 0.03898 * 104 = 4.05392 g
2)
a)
mr of B2H6 - 28
Moles of B2H6 - 36.1/28 = 1.2893 moles
Mr of O2 - 32
Mass of O2 - 32 * 1.2893 = 41.257 g
b)
Moles of B2H6 - 19.2/28 = 0.6857 moles
Stoichiometry 1:1 ratio between B2H6 and H2O
So moles of H2O is 0.6857
c) moles of O2 - 2/24(r.t.p) = 0.083 moles
Mass of B2H6 - 0.083 * 28 = 2.3 g
Help! It’s due in 1 minute
The answer is the last option, Zn + S ➡️ ZnS.
When sodium is put in water, the metal floats on the surface and reacts to form sodium
pls help asap
Answer: Sodium also floats on the surface, but enough heat is given off to melt the sodium (sodium has a lower melting point than lithium and the reaction produces heat faster) and it melts almost at once to form a small silvery ball that dashes around the surface.
Explanation:
Answer:
hydroxide.
Explanation:
Alkali metals are in group 1 of the Periodic Table. They are on the left of the Periodic Table. These are the alkali metals as follows:
LithiumSodiumPotassiumRubidiumCaesiumFranciumWhen alkali metals react with water they make alkaline solutions, so the universal indicator turns people and they produce hydrogen and a metal hydroxide. When sodium is put in water, the metal floats on the surface it reacts to form sodium hydroxide and hydrogen.
A force of 5N accelerates an object. The object mass is 50 g. What is the acceleration of an object?
Answer:
100 m/ s²
Explanation:
Newton's Second Law of Motion:
[tex] \boxed{ \mathsf{force = mass \times acceleration}}[/tex]
___________________
In the question:
Force applied = 5 N mass of the object experiencing force = 50 gNote that the quantities here must be in their SI units.
SI unit of Force is Newton(N).
SI unit of mass is kilogram(kg)
Force is already in it's SI unit, while mass isn't.
Converting mass from grams to kilograms:
1000 g = 1 kg
=> 1 g = 1/ 1000 kg
=> 50 g = 50/ 1000 kg
= 1/ 20 kg
___________________
Calculating acceleration:
[tex] \mathsf{5 = \frac{1}{20} \times acceleration }[/tex]
multiplying both sides by 20:
[tex] \implies \mathsf{5 \times 20= (\frac{1}{20} \times 20)\times acceleration }[/tex]
20 on the RHS gets canceled, for it's present on the numerator as well as the denominator.
[tex] \implies \mathsf{100= acceleration }[/tex]
So, here, we got acceleration = 100 m/s².
Since, the other quantities used in the formula are in their SI units, acceleration must be in it's SI unit as well.
The SI unit of acceleration is m/s²
___________________
Answer:
[tex] \boxed{ \mathsf{100 \:m/s^2= acceleration }}[/tex]
How are osmosis and facilitated diffusion similar?
Answer:
I think it's is because during osmosis because when the cell duplicates in osmosis it divides into two smaller daughter cells; in diffusion there is a higher concentration near where it is but its getting smaller particles from where the source is
What is chemistry,define it ?
Answer:
the branch of science that deals with the identification of the substances of which matter is composed; the investigation of their properties and the ways in which they interact, combine, and change; and the use of these processes to form new substances.
Explanation:
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There are 6. 022 Times. 1023 atoms of Hg in 1 mole of Hg. The number of atoms in 4. 5 moles of Hg can be found by multiplying 4. 5 by 6. 022 Times. 1023. Which is the number of atoms in 4. 5 moles of Hg, correctly written in scientific notation with the correct number of significant figures? 2. 7 Times. 1024 27 Times. 1023 2. 71 Times. 1024 27. 099 Times. 1023.
The number of atoms of Hg in 4.5 mole sample has been given as [tex]\rm 2.7099\;\times\;10^2^4[/tex]. Thus, option A is correct.
The number of atoms in a mole of sample has been given by Avogadro number. Avogadro number has been a constant and has been given the value of [tex]\rm 6.023\;\times\;10^2^3[/tex].
The number of atoms in a mole of sample has been given as:
[tex]\rm 1\;mole=\;6.022\;\times\;10^2^3[/tex]
The given sample has been consisted of 4.5 moles of Hg. Thus, the number of atoms in the sample has been given by:
[tex]\rm 1\;mole\;Hg=\;6.022\;\times\;10^2^3\;atoms\\4.5\;mol\;Hg=4.5\;\times\;6.022\;\times\;10^2^3\;atoms\\4.5\;mol\;Hg=27.099\;\times\;10^2^3\;atoms[/tex]
The scientific notation has been the short hand used for writing the numbers. The short hand for atoms in 4.5 moles of Hg has been [tex]\rm 2.7099\;\times\;10^2^4[/tex].
Thus, the number of atoms of Hg in 4.5 mole sample has been given as [tex]\rm 2.7099\;\times\;10^2^4[/tex]. Thus, option A is correct.
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The periodic table of the elements is a very useful organizational tool in science. What are some organizational tools you use in your daily life? How do they make your life easier
Answer:
There are several different types of tools you could encounter, including project management software, note-taking programs, journals, and day planners. Organization management tools help in sorting out one’s daily responsibilities and being more efficient with time: calendars, to-do lists, mind maps, document storage clouds.
Explanation:
what i know:) hope it helps
For the following hypothetical reaction:
3A + 12B --> 3C
How many moles of B will you need to convert 5 moles of A into as many moles of C as possible?
Answer:
20
Explanation:
You need 4 times the amount of B, compared to a (there is a 3A:12B which reduces to 1:4), so 4 times 5 is 20.
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How do covalent compounds differ from ionic compounds?
Answer:
1. Ionic bonds result from transfer of electrons, but covalent bonds are formed by sharing.
2. Ions are arranged in a three-dimensional array (like crystals). Covalently bonded substances exist as discrete molecular units.
3. Ionic compounds often dissociate into ions in solution, but covalently bonded molecules retain their molecular identity in solution.
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balanced chemical equations a) Sodium + Oxygen
b) Potassium + Chlorine
c) Hydrogen + Chlorine
d) Nitrogen + Hydrogen
e) Calcium + Nitrogen
f) Calcium carbonate
8) Zinc + Hydrochloric acid Zinc chloride + Hydrogen h) Ammonia + Nitrogen - Calcium nitride Carbon dioxide + Calcium oxide Ammonium nitride
Answer:
a) sodium oxide
b) potassium peroxide
c) Hydrogen chloride
d) form ammonia
e) Calcium nitride
Answer the following question in 1-2 complete sentences. What factors can influence the properties of glass, which include its ability to transmit, reflect, or absorb light, or to be transparent?.
What factors can influence the properties of glass, which include its ability to transmit, reflect, or absorb light, or to be transparent?
Answer · 47 votes
The properties can be influenced by many factors. The most common are the shape of the object, the lighting where the object is located, the environment (colors, shapes, density of other objects, etc.), and the viewing angle of the observer.
why does a oxygen atom form a 2- ion
Answer:
It's because it has 2 electrons on its outer ring
Explanation:
It has a -2 ion due to it having 2 more electrons than protons making it an overall negative. It's well known in chemistry that the first ring can only hold 2 electrons while the second and furthermore can hold up to 8. But what happens when you have 9? a new ring starts and it would only contain 1 electron.. In our case here it has 2 more electrons than protons and those 2 electrons are located on the outer ring
Which gas makes your voice deeper or has the opposite effect on you than helium when you inhale it.
Answer:
Sulfur hexafluoride
Explanation:
It is heavier than air that we breathe so it has an opposite effect.
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A sample of Ar gas occupies a volume of 1.2 L at 125 degrees * C and a pressure of 10 atm. Determine the temperature , in degrees Celsius, at which the volume of the gas would be 1.0 L at the same pressure .
Answer:
58.64
Explanation: You want to use the combined gas law equation (P1*V1)/(n1*T1)=(P2*V2)/(n2*T2). So first cross out what remains constant, so pressure and I assume moles (since it was not mentioned as a change). You want to change the temperature to Kelvin (always) to do work, then you can solve algebraically for the answer! Once you have your answer change it to Celsius since that's what you were asked for.
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A sample of ethanol (C2H6O) has a mass of 0. 2301 g. Complete combustion of this sample causes the temperature of a bomb calorimeter to increase by 1. 33°C. The calorimeter has a mass of 2. 000 kg and a specific heat of 2. 45 J/g•°C. What is the heat of combustion for this sample? kJ.
The heat of combustion of the sample is calculated to be -1300 kJmol-1.
We know that energy is neither created nor destroyed but is converted from one form to another. The heat lost by the ethanol when it is burnt is equal to the heat gained by the calorimeter.
Heat gained by calorimeter = 2.×10^3 g × 2. 45 Jg-1°C-1 × 1. 33°C
= 6.5 kJ
Number of moles of ethanol = 0. 2301 g/46 g/mol = 0.005 moles
Heat of combustion of the sample = -( 6.5/0.005 moles) = -1300 kJmol-1
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Where do properties of matter come from?
Answer:
Extensive or inextinsive and either physical or chemical
You would expect that a string of light that are set up in a series circuit would
how many neutrons of atomic mass is 31 and atomic number is 12
[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
As we know, Number of protons = Atomic Number
So,
Number of protons = 12And, Atomic mass = Number of protons + Number of Neutrons (N)
therefore ~
31 = 12 + N N = 31 - 12 N = 19Number of Neutrons = 19
Prokaryotic and Eukaryotic Cells Booklet
Answer:
Power Plant = Mitochondria (Mitochondria is the powerhouse of the cell)
City Limits = Cell Membrane (Outer layer of a cell)
City Hall = Nucleus (The nucleus is the control center in a cell)
City Food Processing Plant (Chloroplast process the cells food)
City Plans = Chromosomes (They contain the genetic information about the cell)
Community = Cytoplasm (Mainly process of elimination)
Explanation:
Explanations are in parenthesis
The electron configuration of a cation with a 2+ charge is shown below.
1s22s22p63s23p6
What is the electron configuration for the ion's neutral parent atom? The atom is a main group
element. Name the group that the parent atom likely belongs to on the Periodic Table and identify
one chemical property of the parent atom.
The electron configuration for the ion's neutral parent atom is
1s²2s²2p⁶3s²3p⁶4s²
It belongs to group 2 on the periodic table and one of its chemical properties is, it has a density of 1.54 g/cm³
From the question,
The cation has a charge of 2+. This means the neutral atom lost 2 electrons.
From the given electron configuration, the cation has 18 electrons.
Therefore, the neutral atom of ion will have 20 electrons.
∴ The electron configuration for the ion's neutral parent atom is
1s²2s²2p⁶3s²3p⁶4s²
The atom belongs to group 2 on the periodic table.
One chemical property of the parent atom
Its density is 1.54 g/cm³
Hence, The electron configuration for the ion's neutral parent atom is
1s²2s²2p⁶3s²3p⁶4s²
It belongs to group 2 on the periodic table and one of its chemical properties is, it has a density of 1.54 g/cm³
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Gaseous chlorine, Cl2, was combined with 0.532g of Titanium, and 2.108 g of TixCly were collected. What is the empirical formula of titanium chloride?
Answer:
TiCl₄
Explanation:
From the law of conservation of mass, the mass of the reactants must equal the mass of the products. In other words:
[tex]\displaystyle \text{m Cl$_2$} + \text{ m Ti} = \text{ m Ti$_x$Cl$_y$}[/tex]
Find the mass of chlorine gas reacted:
[tex]\displaystyle \begin{aligned} \text{ m Cl$_2$} + (0.532 \text{ g}) & = (2.108 \text{ g)} \\ \\ \text{m Cl$_2$} & = 1.576 \text{ g} \end{aligned}[/tex]
Find the number of moles of each reactant using their respective molecular weights:
[tex]\displaystyle 1.576 \text{ g Cl$_2$} \cdot \frac{1 \text{ mol Cl$_2$}}{70.90\text{ g Cl$_2$}} \cdot \frac{2\text{ mol Cl}}{1\text{ mol Cl$_2$}} = 0.04446\text{ mol Cl}[/tex]
And:
[tex]\displaystyle 0.532\text{ Ti} \cdot \frac{1\text{ mol Ti}}{47.87\text{ g Ti}} = 0.0111\text{ mol Ti}[/tex]
To find the empirical formula, all values by the smallest value:
[tex]\displaystyle \begin{aligned} \frac{0.0111\text{ mol Ti}}{0.0111} & = \frac{0.04446\text{ mol Cl}}{0.0111} \\ \\ 1\text{ mol Ti} & \approx 4\text{ mol Cl}\end{aligned}[/tex]
Hence, there are four moles of chlorine for every one mole of titanium.
In conclusion, our empirical formula is TiCl₄.
can you help me with this
Answer:
I think it is A
Explanation:
if I am wrong I am so so so sorry
but i'm pretty sure I am right.
please let me know if I am right :)
When no more solute will dissolve in a solvent, the solution is_________.
Answer:
saturated solution because it can only dissolve upto fixed temperature
Answer:
Saturated
Explanation:
Explanation from online:
"When the solution equilibrium point is reached and no more solute will dissolve, the solution is said to be saturated. A saturated solution is a solution that contains the maximum amount of solute that is capable of being dissolved."
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