According to the law of conservation of mass, there is no net change in the reactants' and products' masses before and after a chemical reaction.
What is chemical reaction?Chemical reaction is defined as a procedure where one or more compounds, known as reactants, are changed into one or more new substances, known as products. When atoms establish or break chemical bonds, chemical reaction take place.
Law of conservation of mass is defined as a chemical reaction requires that the total mass of the reactants and products be equal. Law of conservation of mass also stated that mass is always conserved throughout chemical reactions and cannot be created or removed.
Thus, according to the law of conservation of mass, there is no net change in the reactants' and products' masses before and after a chemical reaction.
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Which statement describes a gas condensing into a liquid?
A.
The atoms in the molecules get heavier so they move less.
B.
The molecules break into smaller pieces that take up less space.
C.
The molecules stick together to make bigger molecules.
D.
The molecules get closer together and move more slowly.
Answer: molecules get closer
Explanation:
Condensation is the process in which molecules of a gas slow down, come together, and form a liquid. When gas molecules transfer their energy to something cooler, they slow down and their attractions cause them to bond to become a liquid
hope this helps
pls mark me brainliest
Answer:
D. The molecules get closer together and move more slowly.
How many moles are in 100g of carbon dioxide?
A.2.27 mol
B.3.51 mol
C. 2.36 mol
D. 1.49 mol
Answer:
A
Explanation:
First, let's find the molar mass of CO₂. This is 12 + 2(16) = 44 g/mole.
Now we can write 100g * (1 mole / 44g) = 2.27 mol, or A. Hope this helps!
how many number of electrons are in nitrogen and aluminium in their ionic States?
PLEASE HELP
Consider the chemical equations shown here.
3 equations. 1: upper N upper O gas plus upper O subscript 3 gas right arrow upper N upper O subscript 2 gas plus upper O subscript 2 gas. Delta H subscript 1 equals 198.9 kilojoules. 2: StartFraction 3 over 2 EndFraction upper O gas right arrow upper O subscript 3 gas. Delta H subscript 2 equals 142.3 kilojoules. 3: upper O gas right arrow one half upper O subscript 2 gas. Delta H subscript 3 equals negative 247.5 kilojoules.
What is DeltaHrxn for the reaction shown below?
NO(g)+O(g)->NO2(g)
Answer:
-304.1
I had this question and that’s what I got
Answer:
-867.7
Explanation:
yeah
A gas occupies 11.2 liters at 0.860 atm. What is the pressure if the volume is doubled?
Answer:
.43 atm
Explanation:
11.2 x .860 = ans./22.4
We can check this by knowing that P and V at constant T have an inverse relationship. Therefore, this answer is correct.
- Hope that helps! Please let me know if you need further explanation.
Where is groundwater stored?
A. in lakes and rivers
B. in oceans
C. in ice caps at the poles
D. in cracks and pores beneath Earth's surface
Answer:
d
Explanation:
Answer:
Answer is D.
in the cracks and pores beneath Earth's surface
Explanation:
hope this helps!
In an experiment, 10.6 grams of steam is produced and then cooled. If the heat of vaporization is 2,257 joules/gram, how much energy is released after all the vapor turns to liquid?
Answer:
23,900 joules
Explanation:
plato answer
Answer:
23,900 joules
Explanation:
Edmentum
Give the molecular geometry and number of electron groups for sf4. give the molecular geometry and number of electron groups for . square planar, 6 electron groups square pyramidal, 6 electron groups t-shaped, 5 electron groups octahedral, 6 electron groups seesaw, 5 electron groups
Answer:
5 electron groups, see saw
Explanation:
During the formation of SF4, the sulfur atom usually bonds with each of four fluorine atoms where 8 of valence electrons are used. The four fluorine atoms have 3 lone pairs of electrons in its octet which will further utilize 24 valence electrons. In addition, two electrons are present as a lone pair on the sulfur atom. We can determine sulfur’s hybridization state by counting of the number of regions of electron density on sulphur (the central atom in the molecule). When bonding takes place there is a formation of 4 single bonds to sulfur and it has 1 lone pair. Looking at this, we can say that the number of regions of electron density is 5. The hybridization state is sp3d.
SF4 molecular geometry is seesaw with one pair of valence electrons. The molecule is polar. The equatorial fluorine atoms have 102° bond angles instead of the actual 120° angle. The axial fluorine atom angle is 173° instead of the actual 180° bond angle.
Which statements describe prominences? Check all that apply.
Prominences are dark, cool areas on the surface of the Sun.
Prominences are composed of cool, dense gas.
Prominences can disturb radio communications on Earth.
Prominences cycle over an 11-year period.
Prominences are loop shaped.
Prominences appear in groups.
Answer:
B. Prominences are composed of cool, dense gas.
C. Prominences can disturb radio communications on Earth.
D. Prominences cycle over an 11-year period.
E. Prominences are loop shaped.
Explanation:
Prominence is the release of high energy particles or dense gases in the form of a loop shape from the surface of the sun. It is cooler and flows out into the Sun's hot atmosphere known as corona.
Once formed, prominence can be quiescent in the space for some period of time before it erupt and get ejected. This eruption and ejection can lead to coronal mass ejections which extends over a very long distance.
When compared to the Sun's temperature, prominences are cooler.
Answer:
B C E
Explanation:
Identify earths lithospheric plates
Answer:
Lithospheric plates are regions of Earth's crust and upper mantle that are fractured into plates that move across a deeper plasticine mantle. Earth's crust is fractured into 13 major and approximately 20 total lithospheric plates.
Explanation:
I hope this helps
ionic compounds conduct electricity in the solid state true or false
In solid form, ionic compounds do not conduct electricity. Ionic compounds will conduct electricity when melted to their liquid state. This is due to the electrons being locked in place when in solid form, but liquid form allows for the electrons to move freely.
8. Which of the following energy sources is relatively expensive to set up. but has a low cost once it is in place?
A. natural gas
B. coal
C. nuclear power
D. solar power
Molecules have Question 1 options: A) both potential and kinetic energy. B) neither kinetic nor potential energy. C) only kinetic energy. D) only potential energy.
Answer:A
Explanation:
Answer: A
Explanation:
La aspirina se prepara haciendo reaccionar ácido salicílico con exceso de anhídrido etanoico. En un experimento, 50.05 g de ácido salicílico se convirtieron en 55.45 g de aspirina. ¿Cuál fue el porcentaje de rendimiento?
La aspirina se prepara haciendo reaccionar ácido salicílico con exceso de anhídrido etanoico. En un experimento, 50.05 g de ácido salicílico se convirtieron en 55.45 g de aspirina. ¿Cuál fue el porcentaje de rendimiento?
In English:
Aspirin is prepared by reacting salicylic acid with excess ethanoic anhydride. In one experiment, 50.05 g of salicylic acid was converted to 55.45 g of aspirin. What was the yield percentage?
Answer:
el rendimiento porcentual para la cantidad dada de ácido salicílico es 84.99 %
In English:
the percent yield for the given amount of salicylic acid is 84.99%
Explanation:
La ecuación química equilibrada para la reacción se puede escribir como:
C₇H₆O₃ + C₄H₆O₃ → C₉H₈O₄ + HC₂H₃O₂
Para la reacción mostrada arriba; El reactivo limitante de la reacción es el ácido salicílico. Ahora; calcular el porcentaje de rendimiento; se espera que primero determinemos el rendimiento teórico de la reacción.
Entonces; la fórmula para calcular el porcentaje de rendimiento: [tex]\mathbf {= \frac{actual \ yield }{theoretical \ yield } *100 }[/tex]
El rendimiento teórico se determina de la siguiente manera:
50.05 g * 1 mol / 138.21 g / mol de C₇H₆O₃ * 1 mol de C₉H₈O₄ / 1 mol de C₇H₆O₃ * 180.157 g / mol de C₉H₈O₄ = 65.24 g de C₉H₈O₄
Porcentaje de rendimiento [tex]\mathbf {= \frac{55.45 }{65.24 } *100 }[/tex]
Porcentaje de rendimiento = 84.99%
Por lo tanto, el porcentaje de rendimiento para la cantidad dada de ácido salicílico es 84.99%
In English:
The balanced chemical eqaution for the reaction can be written as:
C₇H₆O₃ + C₄H₆O₃ → C₉H₈O₄ + HC₂H₃O₂
For the reaction shown above; The limiting reactant from the reaction is salicylic acid. Now; to calculate the percentage yield ; we are expected to first determine the theoretical yield of the reaction.
So; the formula for calculating the percentage yield [tex]\mathbf {= \frac{actual \ yield }{theoretical \ yield } *100 }[/tex]
The theoretical yield is determined as follows:
50.05 g * 1 mol/ 138.21 g/mol of C₇H₆O₃ * 1 mol of C₉H₈O₄/ 1 mol of C₇H₆O₃ * 180.157 g/mol of C₉H₈O₄ = 65.24 g of C₉H₈O₄ is produced
Percentage yield [tex]\mathbf {= \frac{55.45 }{65.24 } *100 }[/tex]
Percentage yield = 84.99%
Thus, the percent yield for the given amount of salicylic acid is 84.99%
Which statements describe gridlines on a map? Select three options. They are measured in degrees. They set up a reference system. They make straight lines on a globe. They run north to west and south to east. They divide Earth into four equal parts.
Answer:
The options that apply to the description of grid-lines of the map are;
They are measured in degrees
They set up a reference system
They divide Earth into four equal parts
FIRST OPTION , SECOND OPTION and FIFTH OPTION are correct.
Explanation:
FIRST OPTION gave the describtion that the grid-lines of the map are measure in degrees,this option is applied to the gridlines on a map because the grid are lined as a result of angular measurement which makes it to makes the unit to be measured degrees and angles.
SECOND OPTION described it as been set up by a reference system which let us know that the area that are plotted were all grid as a result of the size
FIFTH OPTION also applied to the
description of the gridlines on a map because the Earth is divided into 4 equal parts through the Prime Meridian i.e the latitudinal line and longitudinal line .
.
Answer:
They are measured in degrees.
They set up a reference system.
They divide Earth into four equal parts.
Explanation:
i took the test
I need help. Please give a detailed answer:
Hydrogen cyanide (HCN) is a colorless gas. It is poisonous and smells like almonds. Draw a Lewis structure for this compound, explain why you drew the Lewis structure the way that you did, and predict the shape of the molecule.
Answer:
What ever you want. I made it like this because it would make the most logical sense with a mix of the Dot system.
Explanation:
Since the question says to explain yourself, and to predict, really any answer would be correct since it sounds like it's not asking for a correct answer, but more of an answer that would make sense to you and explain it. That's really what chemistry is, a bunch of educated responses and guesses with confidence.
PLEASE ANSWER ASAP- 2 MIN LEFT
A pH of 7 indicates that a solution is ___________ ; a ph <7 would mean the solution is ____________________; and a pH >7 is a(n) ---------- solution.
Answer:
neutral, acidic, basic
Explanation:
Know the acidity rules. Sorry I just saw this!
- Hope that helps! Please let me know if you need further explanation.
50 POINTS!!!
Calculate the Pressure in atmospheres of 0.5 mol of helium (He) at 20 degrees celcius and occupying 2.50 L. Show all work.
Answer:
Pressure = 4.81atm
Explanation:
Pressure = ?
Temperature = 20°C = (20 + 273.15)K = 293.15K
Volume = 2.50L
R = 0.082J/mol.K
n = 0.5mol
From ideal gas equation,
PV = nRT
P = pressure of the ideal gas
V = volume the gas occupies
n = number of moles of the gas
R = ideal gas constant and may varies due to unit of pressure and volume
T = temperature of the ideal gas
PV = nRT
Solve for P,
P = nRT/ V
P = (0.5 * 0.082 * 293.15) / 2.50
P = 12.01915 / 2.50
P = 4.807atm
P = 4.81atm
The pressure of the ideal gas is 4.81atm
* I’ll give you brainlist* The skeletal system has many functions. Which of the following body functions does the skeletal system NOT do?
Answer:
A) remove germs from the blood
Explanation:
cause the rest are the skeletal system function
Answer:
The skeletal system does not remove germs from the blood
Explanation:
I learned that from my teacher
Which phrase describes a volcano that is not expected to erupt again?
quiet volcano
extinct volcano
dormant volcano
explosive volcano
Use the term DNA in a sentence
about proteins.
The organic materials which are present in all organisms in the form of DNA or RNA are called nucleic acids. It is the basic genetic material of our body.
What is DNA?The group of molecules which are responsible for carrying and transmitting the hereditary characters or the genetic information from parents to the offsprings is known as Deoxy-ribonucleic acid or DNA.
The DNA is a polynucleotide molecule, the polypeptide chains are further folded in secondary, tertiary and quaternary structures to form different proteins. Every organism contains many genes in its DNA, different types of proteins can be formed.
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A 0.80 L sample of gas has a temperature of 27°C and a pressure of 0.925 atm. How many moles of gas are present?
Answer:
n= 0.03 moles
Explanation:
Using the ideal gas law:
PV=nRT
nRT=PV
n= PV/RT
n: moles
P: pressure in atm
V= volume in L
R= Avogadro's constant = 0.0821
T= Temperature in K => ºC+273.15
n= (0.925 atm)(0.80 L) / (0.0821)(300.15 K)
n= 0.03 moles
Which of the following Noble Gases has a mass of 10.0 g?
Answer:
Option B is correct.
0.119 mole of Kr has a mass of 10.0 g
Explanation:
The complete Question was ontained online, albeit, it was incomplete, even from the online source. But the solution is possible based on the part of the question obtained.
Complete Question
Which of the following Noble Gases has a mass of 10.0 g?
A. 2.02 mol Ne B. 0.119 mol Kr C.
Solution
Number of moles = (Mass)/(Molar Mass)
Mass = (Number of moles) × (Molar mass)
Checking the options, one at a time,
A. 2.02 moles of Neon
Number of moles = 2.02 moles
Molar Mass of Neon = 20.1797 g/mol
Mass = 2.02 × 20.1797 = 40.762994 g ≠ 10.0 g
Not the answer.
B. 0.119 moles of Krypton
Number of moles = 0.119 moles
Molar Mass of Krypton = 83.798 g/mol
Mass = 0.119 × 83.798 = 9.971962 g ≈ 10.0 g
This is definitely the answer.
Hope this Helps!!!
Answer: 0.119 mol Kr
Explanation:
If O2(g) reacts with H2(g) to produce H2O, what is the volume of H2O obtained from 1 L of O2?
Hint: Write a balanced equation first!
Answer:
2L
Explanation:
We'll begin by writing the balanced equation for the reaction this is illustrated below:
2H2 + O2 —> 2H2O
1 mole of a gas occupy 22.4L.
1 mole of O2 occupy 22.4L.
2 moles of H2O occupy = 2 x 22.4 = 44.8L.
From the balanced equation above,
22.4L of O2 produced 44.8L of H2O.
Therefore, 1L of O2 will produce = 44.8/22.4 = 2L.
Therefore, 1L of O2 will produce 2L of H2O.
A group of tissues working together is?
Answer:
An organ
Explanation:
An organ is one or more tissues that work together to form a specific function.
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The Ka of acetic acid (CH3COOH) is 1.8 x10-5.
Calculate the pH of a 3.0 M solution of acetic acid.
Answer: 2.13
Explanation: i crawled so you could run :)
CHEM HELP PLS 30 POINTS!!
1. what volume of 0.20 M HCl (aq) is needed to titrate 50 mL of 0.10 M NaOH to the endpoint?
A) 10.0 mL HCl
B) 40.0 mL HCl
C) 25.0 mL HCl
D) 20.0 mL HCl
2. what is the molarity of a NaOH solution if 40 mL of the solution is titrated to the endpoint with 15 mL of 1.50 M H2SO4?
A) 1.13 M
B) 1.47 M
C) 0.56 M
D) 0.75 M
3. suppose that 10.0 mL of HNO3 is neutralized by 71.4 mL of a 4.2 x 10 ^ -3 M solution of KOH in a titration. Calculate the concentration of the HNO3 solution.
A) 1.0 x 10 ^ -2 M
B) 3.0 x 10 ^ -2 M
C) 5.5 x 10 ^ -2 M
D) 1.0 x 10 ^ -14 M
Balanced equation
HCl + NaOH —> NaCl + H₂O
From the balanced equation above,
The mole ratio of the acid, HCl (nA) = 1The mole ratio of the base, NaOH (nB) = 1From the question given above, the following data were obtained:
Volume of base, NaOH (Vb) = 50 mLConcentration of base, NaOH (Cb) = 0.1 MConcentration of acid, HCl (Ca) = 0.2Volume of acid, HCl (Va) =?CaVa / CbVb = nA / nB
(0.2 × Va) / (0.1 × 50) = 1
(0.2 × Va / 5 = 1
Cross multiply
0.2 × Va = 5
Divide both side by 0.2
Va = 5 / 0.2
Va = 25 mL (Option C)
2. How to determine the molarity of NaOHBalanced equation
H₂SO₄+ 2NaOH —> Na₂SO₄ + 2H₂O
From the balanced equation above,
The mole ratio of the acid, H₂SO₄ (nA) = 1The mole ratio of the base, NaOH (nB) = 2From the question given above, the following data were obtained:
Volume of base, NaOH (Vb) = 40 mLConcentration of acid, H₂SO₄ (Ca) = 1.5 MVolume of acid, H₂SO₄ (Va) = 15 mL Concentration of base, NaOH (Cb) =?CaVa / CbVb = nA / nB
(1.5 × 15) / (Cb × 40) = 1 / 2
22.5 / (Cb × 40) = 1 / 2
Cross multiply
Cb × 40 = 22.5 × 2
Divide both side by 40
Cb = (22.5 × 2) / 40
Cb = 1.13 M (Option A)
3. How to determine the molarity of HNO₃Balanced equation
HNO₃ + KOH —> KNO₃ + H₂O
From the balanced equation above,
The mole ratio of the acid, HNO₃ (nA) = 1The mole ratio of the base, KOH (nB) = 1From the question given above, the following data were obtained:
Volume of base, KOH (Vb) = 71.4 mLConcentration of base, KOH (Cb) = 4.2×10¯³ MVolume of acid, HNO₃ (Va) = 10 mL Concentration of acid, HNO₃ (Ca) =?CaVa / CbVb = nA / nB
(Ca × 10) / (4.2×10¯³ × 71.4) = 1
(Ca × 10) / 0.29988 = 1
Cross multiply
Ca × 10 = 0.29988
Divide both side by 10
Ca = 0.29988 / 10
Ca = 3×10¯² M (Option B)
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What type of element is generally largest
Answer:Hydrogen
Explanation:is the most abundant element in the universe (75%by weight or 88% of all of the atoms of the universe)
Which is the best example of the use of imagery in a sentence?
Answer:
Explanation: As the good witch Azura said when she was in the bog of immediate regret I challenge you to a witches duel.
im sorry if that was bad i got nothing lol
also took it from The Owl House
Na2CO3 is a/an ____________ compound where its electrons are _______. *
1.covalent, shared
2.covalent, gained/lost
3.ionic, gained/lost
4.ionic, shared
Answer:
Answer is 3 because NaCo3 because NaCo3 is ionic compound and electrons of ionic compound are gained / lost
