Answer:
B.
Solution given:
specific heat capacity of water [c]4.186 J/g °C
temperature[∆T]=?
mass[m]=3g
heat[Q]=8000J
we have
Q=mc∆T
8000=3*4.186*∆T
∆T=8000/12.558
∆T=637.04°C.
the temperature change is 637.04°C.
Write the balanced chemical equation for the reaction of glucose (C6,H12,O6) with oxygen gas to produce carbon dioxide gas
and water vapor.
Answer:
C6H12O6+6O2=6Co2+6H2o
The balanced chemical equation for the reaction of glucose (C₆H₁₂O₆) with oxygen gas to produce carbon dioxide gas and water vapor is C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O
The balanced chemical equation is the equation in which the number of atoms on the left hand side that is reactant side is equal to the number of atoms on the right hand side that is product side in an equation.
The balanced chemical equation is:
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O
Thus, from the above conclusion we can say that The balanced chemical equation for the reaction of glucose (C₆H₁₂O₆) with oxygen gas to produce carbon dioxide gas and water vapor is C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O
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How many molecules of H2O are contained in 78.34 grams?
6.342 X 1019 molecules
2.618 X 1024 molecules
5.634 X 1025 molecules
9.984 X 1022 molecules
1.198 X 1026 molecules
Answer:
4.716x10^25
Explanation:
1 molecule of water is equivalent to 6.02x10^23
hence 78.34 is equivalent to 78.34x6.02x10^23
and the answer is 4.716x10^25
Why are elements in the tall columns of the periodic table called representative elements
Answer:
In addition, the number of valence electrons present in the elements of these groups denotes the group. The valence electrons present in their elements reflect their particular group, which is why they are termed representative elements.
Explanation:
For a reaction, Delta * H ^ 0 = - 75KJ / m * o * l and triangle S^ 0 =-0.081KJ/(K* mol) . At what temperatures is this reaction spontaneous?
Answer:
At temperatures below 924.93K.
Explanation:
Hello there!
In this case, according to the thermodynamic definition of the Gibbs free energy of reaction:
[tex]\Delta G=\Delta H-T\Delta S[/tex]
Now, for us to determine the correct temperature range, we must make ΔG=0 and solve for T:
[tex]T=\frac{\Delta H}{\Delta S} =\frac{-75kJ/mol}{-0.081kJ/mol-K}\\\\T=925.93K[/tex]
Thus at temperatures below 925.93 K we will have an spontaneous reaction (ΔG<0).
Regards!
What is a conjugate acid-base pair?
Answer:
A
Explanation:
In the Brønsted-Lowry definition of acids and bases, a conjugate acid-base pair consists of two substances that differ only by the presence of a proton (H⁺).
What does the rate law use to determine the rate of a reaction?
A. The rate of a reaction is set equal to the rate constant of the
reaction.
B. The rate of a reaction is calculated using the concentrations of
reactants.
C. The rate of a reaction is calculated using the concentrations of the
products.
D. The rate of a reaction is calculated using the temperature of the
solution.
Answer:
B
Explanation:
reaction order is simply the sum of orders for each reactant.
The rate of a reaction is calculated using the concentrations of reactants and is denoted as option B.
What is Rate law?
This is a type of relationship which depicts comparison of reaction rates with the reactant concentrations.
This is because the reactants are the ones involved in a chemical reaction to form products.
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Sierra has a special kind of liquid rubber. She knows that ultraviolet light is
absorbed by the rubber, X-ray light is transmitted through the rubber, and blue
light is reflected off the rubber. Sierra wonders if the liquid rubber will become
solid if she shines the lights on it.
Can light cause the rubber to become solid? Why or why not? Does it matter
what type of light she shines on the rubber?
Answer:
See explanation
Explanation:
Light is a form of energy. Both ultraviolet light and xrays are part of the electromagnetic spectrum.
As was said in the question, ultraviolet rays is absorbed by the rubber. We must know that prolonged exposure of this piece of rubber to incident ultraviolet light causes the vaporization of volatile materials in the rubber.
When volatile materials in the rubber vaporize, the rubber can become solid. Thus, ultraviolet light can cause rubber to become solid.
However, not all types of light can do this hence it does matter the type of light that falls on the rubber material.
3x +14y=5xy
21y - x =2xy
Answer:
456789
Explanation:
Question 4 of 10
Which molecule is hexanal?
ОА, НС
ОН
В.
||
Ос. Н?
нсон
D.
Answer:
Hexanal, once commonly called caproic aldehyde, is a six-carbon straight-chain aldehyde. It is a clear liquid with an atmospheric-pressure boiling point of 131 ºC
Answer:
the answer is B the biggest one
Explanation:
Which equation is an expression of the rate law?
A. PV = nRT
B.
* = AR
C. Rate = K[A]”[B]"
D. Keg
C D
[Al"B
Answer:
The answer to the question is C
The equation which is an expression of the rate law is: Rate = K[A]”[B]". Thus, the correct option will be C.
What is the rate law?A rate law of a chemical equation shows how the rate of a chemical reaction depends on the concentration of reactant molecules. For a chemical reaction such as aA → products, the rate law of the reaction generally has the form rate = k[A]ⁿ, where k is a proportionality constant which is called as the rate constant and n is the order of the reaction with respect to A reactant.
The rate law of a chemical reaction contains only one concentration term which is raised to the first power. Hence the rate constant of a reaction must have units of reciprocal seconds (s⁻¹) to have units of moles per liter per second for the reaction rate: M·s⁻¹ = M/s.
Therefore, the correct option will be C.
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Which of the following statements explains how temperature affects the rate of a reaction ? (5 points ) When temperature decreases , collision of particles increases . When temperature decreases , kinetic energy increases . When temperature increases , particles move slower . When temperature increases , particles move faster
Answer:
As the kinetic energy of the gaseous solute increases, its molecules have a greater tendency to escape the attraction of the solvent molecules and return to the gas phase. Therefore, the solubility of a gas decreases as the temperature increases.
Explanation:
As the kinetic energy of the gaseous solute increases, its molecules have a greater tendency to escape the attraction of the solvent molecules and return to the gas phase. Therefore, the solubility of a gas decreases as the temperature increases.
The statement which explains the affects to temperature to the rate is that when temperature increases, particles move faster.
What is the rate of reaction?Rate of any reaction gives idea about the speed of the completion of any chemical reaction.
If temperature of the chemical reaction increases, then the movement of the particle increases.Fast movement increases the collision.And more collision in turn increases the rate of the reaction.Hence, when temperature increases, particles move faster.
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Describe the trends in properties of chlorides across period 3 .Their formula .Their state .Their volatility .Their structure .The ph of aqueous chloride solution
Answer:
See explanation
Explanation:
Period 3 elements include; Na, Mg, Al, Si, P,S,Cl and Ar
Across the period, the chlorides of the elements change from solid to gas. The chlorides of metals are solid while the chlorides of non metals are gaseous.
Also, the chlorides become more volatile across the period. The formulas of the chlorides change from MCl to MCl2 to MCl3 to MCl4, MCl5 and MCl6 respectively across the period where M is a period 3 element.
The pH of the solutions of chlorides of period 3 elements change from neutral to acidic across the period. The pH of the chlorides of metals are neutral while the chlorides of the nonmetals usually yield acid solutions.
True or false: scientific theories and models cannot be modified.
Lithium chloride + Iron → ?
Answer:
Lithium chloride + Iron
No reaction takes place, because lithium is more reactive than iron, so Iron cannot displace lithium from its solution.
Hope u understand
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Someone help me please
Answer:
1 - Biometric
2- Unique
3 - Skin cells
4 - The latent
5 - basal
6 - buckling
Explanation:
What is the number of carbon atoms in a cycloalkyne with 8 hydrogen atoms
Answer:
4
Explanation:
C4H8
explain functional group containing carbon hydrogen and oxygen
Answer:
Any organic compound with a carboxyl functional group—a carbon with one double bond to an oxygen and a single bond to another oxygen, which is then connected to a hydrogen—is referred to as a carboxylic acid.
Explanation:
Functional group containing carbon, hydrogen and oxygen is aldehyde. In aldehyde, carbon is attached to single bonded hydrogen atom and double bonded oxygen atom.
What is aldehyde ?An aldehyde is an organic molecule having the structural element RCH=O in its functional group. The functional group itself can be categorized as either a formyl group or an aldehyde. Aldehydes are widespread and have significant uses in both technology and biology.
It is employed in the tanning, preservation, and embalming processes as well as in the manufacturing of certain polymeric materials. It is also used as a fungicide, insecticide, and germicide for plants and vegetables.
Aldehydes are carbonyl compounds that are abundant in the environment and can be found in both natural and man-made sources. The aldehydes are often hazardous to the body since they are reactive species.
Thus, Functional group containing carbon, hydrogen and oxygen is aldehyde.
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What is the amount of sodium hydroxide, NaOH, in 4.6 g? Use the values given for
the atomic mass of Na, H, and O.
6
Na = 22.989 770 u
H = 1.007 94u
0 = 15.99944
9
a) 0.19 mol
12
b) 0.12 mol
15
c) 1.8 x 102 mol
d) 0.20 mol
Answer: 0.12 Mol
Explanation: Molecular mass of NaOH is = 39,997 g/mol which is Atomic mass of Na + Atomic Mass of H + Atomic mass of O
4.6g / 39.997g/mol = 0.12 mol
Th following diagram is an example of a(n) [Hurry!!]
A. Covalent Bond
B. Ionic Bond
C. Metallic Bond
The following diagram is an example of a(n) [Hurry!!]
A. Covalent Bond ✓ answer
B. Ionic Bond
C. Metallic Bond
Answer:
This is the diagram of covalent bond
PLEASE ANSWER
12.4 g of sodium sulfate, Na2SO4, is dissolved to prepare 300.0 mL of solution. What is the amount concentration of sodium ions in the solution? The molar mass of sodium sulfate is 142.0428 g/mol. *
2.33 mol/L
0.582 mol/L
0.0873 mol/L
0.291 mol/L
Answer: D
Explanation:
A substance has a freezing point of -4 °C and a boiling point of 60 °C.
9. At which temperature would the substance be found in its solid state?
A. -10 °C
B. 0 °C
C. -1 °C
D. 60 °C
Answer:
A substance has a freezing point of -4 °C and a boiling point of 60 °C.
At which temperature would the substance be found in its solid state?
Explanation:
The freezing point is the equilibrium temperature at which both solid and liquid phases of a substance will coexist.
Below the freezing point of a substance, it exists in a solid state.
Given,
the freezing point of a substance is [tex]-4^{o} C[/tex].
So, below this temperature, the substance exists in a solid state.
Among the given options,
option A that is [tex]-10^{o} C[/tex] is less than [tex]-4^{o} C[/tex].
Hence, the answer is option A.
The temperature at which the substance would be found in its solid state is -10°C.
The given parameters:
Freezing point of the substance, T = -4 °CBoiling point of the substance, T = 60 °CThe freezing point of a substance is the equilibrium temperature at which both solid and liquid phases of a substance will coexist.
Since the freezing point of the substance is -4 °C, its solid state will be found below -4 °C.
From the given options, only -10°C is below -4 °C.
Thus, we can conclude that the temperature at which the substance would be found in its solid state is -10°C.
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Explain the difference between solid liquid and gaseous states using the theoritical
Answer:
solid is the substance which is hard
liquid is the substance which we get in liquid form for example water milk etc
gases are those substance which we cannot touch and see
The force of gravity pulling down on the
barbell is 756 newtons (N) How many
newtons of force are exerted by the
weightlifter to hold the barbell up?
Answer:
Explanation:
The same. The force down (the weight of the barbells) is counter balanced by the weight up ( a person holding the barbells). A little later on, you are going to draw force diagrams showing that these two forces are drawn acting in opposite directions.
You can satisfy yourself by drawing a box and putting 1 arrow pointing up on the bottom and labeling it 756 up and another arrow on the top of the box pointing down and labeling it 756. They balance.
A solution at 25 degrees Celsius has a pOH of 6.42. What is the pH of this solution?
0.842
3.80
5.59
7.58
You must go to the mountain or apraturakados to answer this question. It will be a daring adventure, but the journey will be worth it. Good luck, student.
The actual answer is 7.58, sorry...
When A solution at 25 degrees Celsius has a pOH of 6.42. So here the pH of the solution is 7.58.
Calculation of the pH of the solution?Since we know that
pH + pOH = 14
here
pOH is 6.42
So,
pH = 14 - pOH
= 14 - 6.42
= 7.58
hence, When A solution at 25 degrees Celsius has a pOH of 6.42. So here the pH of the solution is 7.58.
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Which of these is a example of a physical change
dawdDAWdADdwaadadadawddawd
Answer:
yyuuuyytt
Explanation:
ggyhggggg,,,,,,,76yyygtyyhgyyggyuhu ubbububuuh7h7h
You are working in the lab, how many grams of solute you need to make 200.0 g of 3.4% of solution?
Answer:
6.8g of solute are needed
Explanation:
Percent by mass, (w/w%) is defined as the mass of solute in 100g of solution. A solution that is 3.4% contains 3.4g of solute in 100g of solution. That means to make 200g of solution are required:
200g solution * (3.4g solute / 100g solution) = 6.8g of solute are needed
1. An atom of an elephant has atomic mass of 39 and has number of neutrons as 20 calculate protons number.
2. An atom of an elephant has the atomic number of 13 and 14 neutrons
A. What is the mass number
B. write the nuclear notation given the atoms as X.
C. How many electrons does atom X have?
D. what is number of protons.
Answer:
See Explanation
Explanation:
1) Let us recall that;
Mass number = number of protons + number of neutrons
Where;
Number of protons = ?
Number of neutrons =20
Mass number =39
Number of protons = mass number - number of neutrons
Mass of protons =39 - 20= 19 protons
2) Atomic number = 13
Number of neutrons =14
Then the mass number =13 +14 =27
The symbol of the element is 27X13
The number of protons= the number of electrons =13
The atomic number is the same as the proton number =13
2NO(g) + 5H2(g) ⟶ 2NH3(g) + 2H2O(g)If 45.4 grams of NO and 12.1 grams of H2 react, what is the largest amount of ammonia that can be formed? The final answer should be reported to one place after the decimal point
Answer:
25.8g of NH3 can be formed
Explanation:
To solve this question we must convert the mass of each reactant to moles using molar mass. With the chemical equation we can find limiting reactant. The moles of limiting reactant are used yo find the moles of ammonia produced and its mass:
Moles NO -30.01g/mol-
45.4g * (1mol / 30.01g) = 1.51 moles
Moles H2 -Molar mass: 2.01g/mol-
12.1g * (1mol / 2.01g) = 6.02 moles
For a complete reaction of 6.02 moles of H2 are needed:
6.02mol H2 * (2mol NO / 5mol H2) = 2.41 moles NO are needed
As there are just 1.51 moles, NO is limiting reactant
Moles NH3:
1.51 moles NO * (2mol NH3 / 2mol NO) = 1.51 moles NH3
Mass NH3 -Molar mass: 17.031g/mol-
1.51 moles NH3 * (17.031g / mol) =
25.8g of NH3 can be formedRadical's of
1. Carbonate=
2.hydroxide=
3.bicarbonat=
4.chloride=
5. phosophate=
6. sulphate=
8. Nitrate=
9. Nitrite=
10. Iodide=
please answer 50 marks
Answer:
1..CO3
2..OH
3..CO
4..Cl
5..PO3
6..SO4
8..NO3
9..NO2
1O..I2
