Answer:
1.29×10²⁴ molecules.
Explanation:
From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.02×10²³ molecules. Thus, 1 mole of Hydrogen sulfide (H2S) contains 6.02×10²³ molecules.
Next, we shall determine the mass of 1 mole of H2S. This is illustrated below:
1 mole of H2S = (2×1) + 32 = 34 g
Finally, we shall determine the number of molecules in 73 g of H2S as follow:
34 g of H2S contains 6.02×10²³ molecules.
Therefore, 73 g of H2S will contain =
(73 × 6.02×10²³) /34 = 1.29×10²⁴ molecules.
Thus, 73 g of H2S will contain 1.29×10²⁴ molecules.
this is a method used to separated parts of a mixture. large and small particles are separated using a screen
Answer:
Screening
Explanation:
Screening is usually done in large amounts.
Thanks!!
What is a photon?
what is a photon?
-a wavelength of energy having amplitude and frequency
-a mixture of different elements in a metal
-a packet of light energy emitted from a light source
-a magnet used to deflect electrons away from traveling in a straight path
Compound 1 melts at 40 degrees Celsius. Compound 2 melts at 1310 degrees Celsius. Compound 3 melts at
240 degrees Celsius. Compound 4 melts at -62 degrees Celsius. Which is most likely to be an ionic compound?
Compound 4
Compound 2
Compound 3
Compound 1
Answer:
Compound 3 i think
Explanation:
What product is formed when each compound is treated with either LiAlH4 (followed by H2O), or NaBH4 in CH3OH
The missing diagrams are shown in the diagrams attached below.
Answer:
Explanation:
The reaction of Lithium Aluminium hydride LiAlH4 with Alkanone leads to the formation of secondary alcohol products. This is because Lithium Aluminium hydride LiAlH4 acts as a reducing agent. The reaction of NaBH4 in CH3OH with Alkanone is less reactive as compared with Lithium Aluminium hydride LiAlH4, thus it also reduces aldehydes and ketones. From the image attached below, we will see the missing diagram and the mechanism used in the process for the formation of those products.
20 POINTS
Why are the following not considered modeling?
a simple drawing
a photograph of a phenomenon
a list of observations
a data table
Group of answer choices
They do not include a key
The data collected could have experimental error.
All of these are considered a form of modeling.
They do not explain what is happening using evidence
Answer:
The answer is a messy model.
Explanation:
It's not a limitation, only an inconvenience. Something that's not really neat is still useful. Hope I helped!
g Chemical species are said to be isoelectronic if they have the same Lewis structure (regardless of charge). In order to achieve an electron configuration that is isoelectric with a noble gas, nonmetals tend to _____.
Answer:
Accept electrons
Explanation:
Non metals are found towards the right hand side of the periodic table. They usually possess more valence electrons than metals.
Hence, they do not give out electrons as metals do in order to become isoelectronic with the noble gases because this will cost a lot of energy. Rather, they accept electrons in order to become isoelectronic with noble gases.
Isoelectronic means that the both species have the same number of electrons. In accepting electrons, nonmetals form negative charges.
[He] 2s22p
What is the chemical symbol for the atom?
How many electrons does the atom have?
How many 2s electrons are in the atom?
Answer:
Detail is given below.
Explanation:
Electronic configuration:
[He] 2s² 2p⁵
Number of electron in given atom:
we know that the atomic number of helium is 2 it means it has 2 electron.
Thus the number of electron in given atom are 2+2+5 = 9
Symbol of atom:
The number of electron is the atomic number of an atom. Thus it means the given atom has atomic number 9 which is fluorine.
Symbol = F
Properties of fluorine:
1. it is yellow in color.
2. it is flammable gas.
3. it is highly corrosive.
4. fluorine has pungent smell.
5. its reactions with all other elements are very vigorous except neon, oxygen, krypton and helium.
How many 2s electrons are in atom?
There are 2 electron are present in 2s subshell of fluorine.
HELPPOOOOOPPPPPPPP MEEEE
Calculate the solubility at 25 °C of Ni(OH)2 in pure water and in a 0.0200 M NaOH solution. You'll find K. data in the ALEKS Data tab. Round both of your answers to 2 significant digits
solubility in pure water:
solubility in 0.0200 M NaOH solution:
Answer:
solusoin ( 0.0130 )²
Explanation:
B How do you think plant and animal cells get the
energy out of glucose?
.
Answer:
.
Explanation:
1. Cells must let what into the cell
Which of the following is a solution?
A. Salt water
B. Macaroni and cheese
C. Cake mix
D. Substance floats in water
Answer:
salt water or cake mix but, I'm pretty sure salt water
Answer:
it is sugar i got it right on study island
Explanation:
When temperature drops, the number of collisions between particles increases
True?
False?
Answer:
False
Explanation:
the number of collisions between particles decreases as there is less energy amid the particles
:)
Use the ΔH°f and ΔH°rxn information provided to calculate ΔH°f for IF: ΔH°f (kJ/mol) IF7(g) + I2(g) → IF5(g) + 2 IF(g) ΔH°rxn = -89 kJ IF7(g) -941 IF5(g) -840 I2(g) 62.42
Answer:
ΔH°f{IF(g)} = -127.58 kJ/mol
Explanation:
Hello.
In this case, since the information about the chemical reaction is:
IF7(g) + I2(g) → IF5(g) + 2 IF(g) ; ΔH°rxn = -89 kJ / mol
ΔH°f{IF7(g)} = -941 kJ / mol
ΔH°f{IF5(g)} = -840 kJ / mol
ΔH°f{I2(g)} =62.42 kJ / mol (it should be 0 since I2 is a pure element that is nor formed by other elements, however, we will use the given value).
Since we don't know the enthalpy of formation of IF, but the enthalpy of reaction for this one is:
ΔH°rxn = ΔH°f{IF5(g)} + ΔH°f{IF(g)} - ΔH°f{IF7(g)} - ΔH°f{I2(g)}
We can obtain it via:
ΔH°f{IF(g)} = ΔH°rxn - ΔH°f{IF5(g)} + ΔH°f{IF7(g)} + ΔH°f{I2(g)}
ΔH°f{IF(g)} = -89 - (-840) + (-941) + 62.42
ΔH°f{IF(g)} = -127.58 kJ/mol
Best regards!
Acetic acid, which is present in vinegar, was found to consist of 40.00% C, 6.71% H, and 53.29% O by mass. Find the empirical formula for acetic acid
Answer:
C2HO
Explanation:
According to this question, acetic acid has a composition of 40.00% C, 6.71% H, and 53.29% O.
This means that;
40.00% C = 40.00g of Carbon
6.71% H = 6.71g of Hydrogen
53.29% O = 53.29g of Oxygen
First, we convert each mass to mole by dividing by their respective atomic mass;
C = 12g/mol, O = 16g/mol, H = 1 g/mol
C = 40.00/12 = 3.33moles
H = 6.71/1 = 6.71moles
O = 53.29/16 = 3.33moles
Next, we divide each mole by smallest value (3.33moles);
C = 3.33/3.33 = 1
H = 6.71/3.33 = 2.01
O = 3.33/3.33 = 1
Approximately, the empirical ratio of CHO is 1:2:1. Therefore, the empirical formula is CH2O.
Acetic acid, which is present in vinegar, was found to consist of by mass. Find the empirical formula for acetic acid
Which periodic family has a full outermost valence shell and rarely reacts with other elements?
Alkali metals
Alkaline earth metals
Halogens
Noble gases
Answer:
The answer would be Noble gases
Noble gases is the periodic family which has a full outermost valence shell and rarely reacts with other element. Therefore, the correct option is option D.
What is periodic table?The organised arrangement of all chemical elements according to the order to increase their atomic number—that is, the total amount of protons within an atomic nucleus—is known as the periodic table, or full periodic chart of the elements. When chemical substances are grouped in this way, a recurring pattern in their properties known as the "periodic law" occurs.
Where substances within the same row (group) exhibit comparable qualities. Dmitry I. Mendeleyev's original discovery, whose was made in the middle of the 19th century, has had immeasurable significance for the advancement of chemistry. Noble gases is the periodic family which has a full outermost valence shell and rarely reacts with other element.
Therefore, the correct option is option D.
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to change a substance from a liquid to a solid, it must be cooled to its
O A. boiling point
O B. melting point
C. coefficient of heat
OD. specific heat
?
Answer:
B. melting point
Explanation:
The melting point is the same as the freezing point. This temperature is when a liquid freezes and becomes a solid, and it is also when a solid melts and becomes a liquid. This is why freezers are set at temperatures lower than the freezing point of water.
Answer:
boiling point
Explanation:
hope this helps
An 80 proof brandy is 40.0 % (v/v) ethyl alcohol. The "proof" is twice the percent concentration of alcohol in the beverage. How many milliliters of alcohol are present in 790 mL of brandy?
Answer:
Answer : The volume of water and alcohol present in 675 mL of this solution is 405 mL and 270 mL respectively.
Explanation :
As we are given that 40.0 % (v/v) alcohol solution. That means, 40.0 mL of alcohol present in 100 mL of solution.
Now we have to calculable the volume of alcohol in 675 mL solution.
As 100 mL of solution contains 40.0 mL of alcohol
So, 675 mL of solution contains alcohol
Thus, the volume of alcohol = 270 mL
Now we have to calculate the volume of water.
The volume of water = Volume of the solution - Volume of alcohol
Volume of water = 675 mL - 270 mL
The volume of water = 405 mL
Thus, the volume of water = 405 mL
Hence, the volume of water and alcohol present in 675 mL of this solution is 405 mL and 270 mL respectively.
790 mL of an 80 proof brandy, which is 40.0 % (v/v) ethyl alcohol, contain 316 mL of ethyl alcohol.
An 80 proof brandy is 40.0 % (v/v) ethyl alcohol, that is, there are 40.0 mL of ethyl alcohol per 100 mL of brandy. This is the conversion factor.
We have 790 mL of brandy. This is the given information.
The milliliters of ethyl alcohol in 790 mL of brandy are:
[tex]790 mL Brandy \times \frac{40.0mLAlcohol}{100mLBrandy} = 316mLAlcohol[/tex]
790 mL of an 80 proof brandy, which is 40.0 % (v/v) ethyl alcohol, contain 316 mL of ethyl alcohol.
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AlBr3+NH3⇌H3NAlBr3 lewis acid and base
Answer:
See explanation
Explanation:
Even though the question is incomplete, but I believe you want to know the Lewis acid and Lewis base in the reaction; AlBr3+NH3⇌H3NAlBr3.
A Lewis acid is a lone pair acceptor while a Lewis base is a lone pair donor.
If we look at the reactants, AlBr3 has an open sextet hence it must be a lone pair acceptor ( a Lewis acid). NH3 is a lone pair donor owing to the lone pair present on nitrogen atom, hence it a Lewis base.
The reaction can be classified as a an acid-base reaction according to the Lewis definition of acids and bases.
We dissolve 345 g of calcium acetate in enough water to make 1.2 L of solution. What is the osmotic pressure of this solution at 54 ∘C? Express your answer in atm.Î
Answer:
[tex]\Pi=146.3atm[/tex]
Explanation:
Hello.
In this case, since the osmotic pressure is computed via:
[tex]\Pi =i*c*RT[/tex]
Whereas the van't Hoff's factor of calcium acetate (molar mass = 158.17 g/mol) is 3 as it dissociates in one calcium ion and two acetate ions, the concentration is:
[tex]c=\frac{345g*\frac{1mol}{158.17g} }{1.2L}=1.82mol[/tex]
Therefore, the osmotic pressure is:
[tex]\Pi =3*1.82mol*0.082\frac{atm*L}{mol*K}*(54+273.15)K\\\\\Pi=146.3atm[/tex]
Best regards!
How many protons, neutrons and electrons are there in the species
26 Si+4?
I know this is basic but, what is the powerhouse if the cell?
50 points!
Answer:
mitochondrion
Explanation:
Vitamin C was measured by an electrochemical method in a 50.0-mL sample of lemon juice. A detector signal of 2.02 mA was observed. A standard addition of 1.00 mL of 29.4 mM vitamin C increased the signal to 3.79 mA. Find the concentration (in mM units) of vitamin C in the juice.
Answer:
The concentration (in mM units) of vitamin C in the juice is 0.64mM.
Explanation:
Let us calculate -:
Concentration of sample =>[tex]1ml\times 29.4mM[/tex]
= 29.4 mmol => 29.4mmol/50ml
= 0.588mM
plug in formula =>[tex]\frac{[final concentration]}{[v_1/v_2]} \times[final concentration]+[concentration of sample])[/tex] or
[tex]\frac{[x]}{[v_1/v-2]} \times[ x]+[concentration of sample])[/tex]
= [2.02 micro-Amber/3.79micro-Amber]
plug in and simplify
1.81x = 1.17
x = 0.64mM
Hence , the answer is 0.64mM.
A reaction vessel for synthesizing ammonia by reacting nitrogen and hydrogen is charged with 6.29 kg of H2 and excess N2. A total of 29.2 kg of NH3 are produced. What is the percent yield of the reaction?
Answer:
81.9%
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
N2 + 3H2 —> 2NH3
Next, we shall determine the mass of H2 that reacted and the mass of NH3 produced from the balanced equation. This is illustrated below:
Molar mass of H2 = 2 ×1 = 2 g/mol
Mass of H2 from the balanced equation = 3 × 2 = 6 g
Converting 6 g of H2 to kg, we have:
1000 g = 1 kg
Therefore,
6 g = 6 g × 1 kg /1000 g
6 g = 0.006 kg
Molar mass of NH3 = 14 + (3×1) = 17 g/mol
Mass of NH3 from the balanced equation = 2 × 17 = 34 g
Converting 34 g of NH3 to kg, we have:
1000 g = 1 kg
Therefore,
34 g = 34 g × 1 kg / 1000 g
34 g = 0.034 Kg
Summary:
From the balanced equation above,
0.006 kg of H2 reacted to produce 0.034 kg of NH3.
Next, we shall determine the theoretical yield of NH3. This can be obtained as follow:
From the balanced equation above,
0.006 kg of H2 reacted to produce 0.034 kg of NH3.
Therefore, 6.29 kg of H2 will react to produce = (6.29 × 0.034)/0.006 = 35.64 Kg of NH3.
Thus, the theoretical yield of NH3 is 35.64 kg.
Finally, we shall determine the percentage yield of NH3 as shown below:
Actual yield of NH3 = 29.2 kg
Theoretical yield of NH3 = 35.64 kg
Percentage yield of NH3 =?
Percentage yield = Actual yield /Theoretical yield × 100
Percentage yield = 29.2/35.64 × 100
Percentage yield of NH3 = 81.9%
A certain species of frog comes in two different colors, green and brown. A population of these frogs live in and along a river. In 1980, a very large drought occurred, causing most of the river to dry up. Most of the plant life around the river died as well.
Why did the green frog population decrease after the drought
dont do the sample response but ill give out a brain thing if ur right
Answer:
The green frog's population decreases because they cannot blend as easily into the mostly brown environment of the dry river bed as their brown counter parts. There are not as many green plants for them to hide against, making it easier for predators to see them.
Explanation:
The green frog's population decreases because they cannot blend as easily into the mostly brown environment of the dry river bed as their brown counter parts. There are not as many green plants for them to hide against, making it easier for predators to see them.
8. When you know both the speed and direction of an object's motion, you know the
a. average speed of the object.
b. acceleration of the object.
c. distance the object has traveled.
d. velocity of the object.
Which of these is an example of physical weathering?
A. Blowing away of lighter rock particles
B. Rock breaking up to due to mechanical force
C. Rock breaking up due to carbonic acid
D. Settling down of tick particles in a new location
Answer:
c
Explanation:
c
How many atom in 5 moles of nitrogen?
Answer:
To start, you need know that all a mole means is you have 6.022 x 1023 atoms of that type. So if I tell you I have a mole of nitrogen, then I have 6.022 x1023 nitrogen atoms. That ugly number is called Avogadro's Constant, NA
Explanation:
hy its isnt the correct answer but checkout the equation hope it help help
What kind of crystalline solid is MgCl2?
A. lonic
B. Metallic
C. Molecular
OD. Network
ionic solid try this answer I’m sure it’s gonna work
Magnesium chloride is a colorless crystalline solid.MgCl₂ is an ionic compound. Therefore, option A is correct.
What are ionic compounds ?When an atom (or group of atoms) gains or loses electrons, ions form charged particles, forming ionic compounds. A cation is a positively charged ion, whereas an anion is a negatively charged ion.
When a metal reacts with a nonmetal, ionic compounds are (usually) formed or a polyatomic ion.
MgCl2 is an ionic compound because the chemical bonds in the molecule are formed by electron transfers between Mg and Cl atoms. Magnesium is an alkaline earth metal that loses two electrons to form magnesium cation, whereas chlorine is a nonmetal that accepts one electron to form chloride ion.
Thus, option A is correct.
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3. Identities of the components in a mixture may be determined by a technique called spiking. Suppose you had run a gas chromatogram on your product and had then deliberately added a drop of a known sample of 3-methylcyclohexene to a drop of your product. What would you expect the new chromatogram to show you?
Answer:
Explanation:
Suppose we dehydrate 2-methylcyclohexanol, the products formed are 1-methylcyclohexene and 3 methylcyclohexene, where 1-methylcyclohexene tends to be the major product because it has the tendency of more substituted double bond.
In any event, gas chromatography method usually reveals two products with their relative amounts but not their identities.
Now, if we carry out a reaction containing those two products and let's say we have a peak 10:1. Then, we add a little drop of 3-methylcyclohexene to the mixture and carry out the test again.
Let's say that the new ratio is 3:1. Therefore, we can conclude that the minor product is 3-methylcyclohexene. However, if the ratio is larger, let say 20:1, then the original sample's major product is 3-methylcyclohexene.
We expect new chromatogram to show the major quantity of one of the formed products.
What is gas chromatography?Gas chromatography is a kind of analytical method in the chemistry to separate and analyze the components of any compound by the adsorption process.
When we already run our product on the gas chromatogram and after the result we add a drop of 3-methylcyclohexene in the product then we don't observe much difference in the result. Because from the gas chromatography result we only get the quantity of any substance not the identity. If already in the product 3-methylcyclohexene was present then in that condition we get a higher peak in graph and identify the component of product.
Hence, 3-methylcyclohexene gives idea about the quantity.
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