Why is modern periodic table better than Mendeleev's periodic table?
Answers
Answer:
because mariah carey wrote it
Explanation:
she also made a song out of it!
Related Questions
What is difference between simple distillation & fractional distillation
Answers
Answer: simple distillation is used to separate substances in mixtures with widely disparate boiling points, whereas fractional distillation is used for mixtures containing chemicals with similar boiling points.
Explanation:
Rebecca is playing a video game that involves planting and cutting down trees. She moves up an energy level for each tree she plants, and she moves down a level for each tree she cuts. If Rebecca reaches energy level 10, she will earn bonus points. Rebecca is currently at energy level 4. The results of her next 3 turns are: Turn 1: 6 trees cut Turn 2: 8 trees planted Turn 3: 1 tree cut
USING ONLY ADDITION, write an expression that represents Rebecca's score after these three turns. (Remember that she starts at an energy level of 4.)
Answers
Answer:
she ends at level 5 after her 3 turns
Explanation:
Rebecca starts at level 4 if she cuts down 6 trees for her next turn she loses 6 levels we can rewrite this as -6 so 4 + (-6) = -2 her next turn is planting 8 trees so she goes up 8 levels -2 + 8 = 6 her last turn she cuts down one tree
6 + (-1) = 5
altogether 4 + (-6) + 8 + (-1) = 5
The ratio of the actual value of a colligative property to the value calculated, assuming the substance to be a nonelectrolyte, is referred to as __________.
a. vapor pressure lowering
b. Henry's law
c. osmotic pressure
d. the van't Hoff factor
e. freezing point depression
Answers
The ratio of the actual value of a colligative property to the value calculated, assuming the substance to be a nonelectrolyte, is referred to as d. the van't Hoff factor
In comparison to the value anticipated for a nonelectrolyte, the Van't Hoff factor measures how much a solute dissociates or ionises in a solution. It is used to account for the impact of solute ionisation or dissociation on the computation of the collinear characteristics of solutions and is represented by the symbol "I".
Colligative qualities are those of a solution that, independent of the chemical composition of the solute particles, rely exclusively on their concentration. Collaborative qualities include things like reduced vapour pressure, increased boiling point, decreased freezing point, and reduced osmotic pressure. If the solute is a nonelectrolyte that doesn't dissolve or ionise, these qualities are utilised to compute the molar mass or molecular weight of the solute in a solution.
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What is the word equation for Sodium Hypochlorite?
Answers
Answer:
Can u phrase differently?
Answer:
If you are looking for the formula, then it is NaOCl
Explanation:
Suppose the interaction between two atoms by the Lennard-Jones potential: ULJ = B/r^12 - A / r^6 where the values of A and B are known to be A = 10^-77 J x m^6 and B = 10^-134 J x m^12.
What does the Lennard-Jones potential predict for the separation r=r eq
hen the energy is at the minimum (equilibrium) value, U min. What is the u min fot this interaction at T=298 K ? What is the ratio of U min to the purely attractive van der Waals component of the interaction potential at r eq.
What is the ratio of r eq to r 0 defined by u(r 0 )=0. 4. What is the ratio of r s to r 0 , where r s is the separation where the magnitude of the (attractive adhesion) force is maximum, F max . What is the value for F max between the two atoms?
Answers
a) The Lennard-Jones potential predicts the separation r_eq at the minimum energy U_min.
b) The U_min for this interaction at T=298 K is the value obtained from the Lennard-Jones potential equation when r=r_eq.
c) The ratio of U_min to the purely attractive van der Waals component of the interaction potential at r_eq can be calculated by comparing the attractive part (-A/r^6) to the total potential energy U_min.
d) The ratio of r_eq to r_0, where u(r_0)=0.4, can be determined by finding the value of r_eq where the potential energy is equal to 0.4 times the total potential energy at r=r_0.
e) The ratio of r_s to r_0, where r_s is the separation where the magnitude of the attractive adhesion force is maximum, can be determined by finding the value of r where the derivative of the potential energy with respect to r is equal to zero.
f) The value of F_max between the two atoms can be obtained by taking the negative derivative of the potential energy equation with respect to r and evaluating it at r=r_s.
a) The Lennard-Jones potential provides information about the relationship between energy and separation between two interacting atoms.
At the minimum energy (U_min), the potential predicts the separation r_eq, which corresponds to the equilibrium distance between the atoms. This is the distance at which the energy of the system is at its lowest point.
b) To determine the value of U_min at a given temperature (T=298 K), you can substitute the equilibrium separation r_eq into the Lennard-Jones potential equation and calculate the resulting energy value.
This will give you the U_min for the interaction.
c) The Lennard-Jones potential consists of two components: an attractive component (-A/r^6) and a repulsive component (B/r^12).
The ratio of U_min to the purely attractive van der Waals component of the interaction potential at r_eq can be calculated by comparing the magnitude of the attractive component to the total potential energy at the equilibrium separation.
This ratio provides insights into the relative contribution of the attractive force to the overall potential energy at equilibrium.
d) The ratio of r_eq to r_0 can be determined by finding the value of r_eq where the potential energy is equal to 0.4 times the total potential energy at r=r_0.
In other words, you need to solve the Lennard-Jones potential equation for r_eq when the potential energy is equal to 0.4 times the potential energy at r=r_0.
e) The ratio of r_s to r_0 is obtained by finding the value of r where the magnitude of the attractive adhesion force is maximum.
This can be determined by finding the separation r where the derivative of the potential energy equation with respect to r is equal to zero.
The value of r_s represents the separation at which the attractive force between the atoms is strongest.
f) The value of F_max between the two atoms can be obtained by taking the negative derivative of the Lennard-Jones potential energy equation with respect to r and evaluating it at r=r_s.
This will give you the magnitude of the maximum attractive adhesion force between the atoms.
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5. Study the food chain below. Mosquito
==> Frog ==> Snake ==> Crocodile ==> Plant
Which of the following statement about the food chain is correct?
a. The food chain can be commonly observed in a garden.
b. There are four predators and four preys in the food chain.
c. The crocodile is the predator of frog.
d. The crocodile depends on the plant for energy.
Answers
If 20g of caco2 and 25g of Hcl are mixed ,what mass of Co2 is produced ?
Answers
Approximately 8.79 grams of CO₂ are produced when 20 grams of CaCO₃ and 25 grams of HCl are mixed.
The balanced chemical equation for the reaction between calcium carbonate (CaCO₃) and hydrochloric acid (HCl) is:
CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O
From the equation, we can see that 1 mole of CaCO₃ reacts with 2 moles of HCl to produce 1 mole of CO₂. The molar mass of CaCO₃ is 100.09 g/mol, and the molar mass of HCl is 36.46 g/mol.
To find the mass of CO₂ produced, we need to determine which reactant is limiting. This can be done by calculating the number of moles of each reactant and comparing them to the stoichiometric ratio in the balanced equation.
Number of moles of CaCO₃ = 20 g / 100.09 g/mol = 0.1998 mol
Number of moles of HCl = 25 g / 36.46 g/mol = 0.685 mol
According to the balanced equation, 1 mole of CaCO₃ reacts with 2 moles of HCl. Therefore, the limiting reactant is CaCO₃, since only 0.1998 moles of CaCO₃ are available to react with HCl.
From the balanced equation, we know that 1 mole of CaCO₃ produces 1 mole of CO₂. Therefore, the number of moles of CO₂ produced is also 0.1998 mol.
The molar mass of CO₂ is 44.01 g/mol. Therefore, the mass of CO₂ produced is:
Mass of CO= 0.1998 mol x 44.01 g/mol = 8.79 g
Therefore, approximately 8.79 grams of CO₂ are produced when 20 grams of CaCO₃ and 25 grams of HCl are mixed.
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Find the volume of a box with a length of 5cm, a width of 5cm and a height of 10cm
Answers
The volume of the rectangular box is 250 cubic centimeters (cm³) or 0.25 liters (L).
To find the volume of a box with a length of 5cm, a width of 5cm and a height of 10cm, we use the formula for the volume of a rectangular box, which is given as;Volume of rectangular box = Length × Width × HeightGiven that the length of the box is 5cm, the width is also 5cm, and the height is 10cm.
Therefore, we substitute the values into the formula above;Volume of rectangular box = 5cm × 5cm × 10cm= 250cm³.
Therefore, the volume of the rectangular box is 250 cubic centimeters (cm³).
We can also represent this volume in liters (L) by converting from cubic centimeters to liters, since 1L is equal to 1000cm³.
Thus, to convert 250cm³ to liters;Volume in liters = Volume in cm³ / 1000cm³/L= 250cm³ / 1000cm³/L= 0.25L.
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calculate the height of a column of ethylene glycol [ch2(oh)ch2(oh)] that would be supported by atmospheric pressure (1 atm). the density of ethylene glycol is 1.12 g/cm3, density of mercury is 13.6 g/ml
Answers
The height of a column of ethylene glycol that would be supported by atmospheric pressure (1 atm) is 11.04 cm.
Calculate the mass of ethylene glycol (ethylene glycol = 1.12 g/cm3)
Mass = Volume x Density
Mass = 1 cm3 x 1.12 g/cm3
Mass = 1.12 g
Calculate the pressure exerted by the ethylene glycol column
Pressure = Force/Area
Force = Mass x Acceleration due to gravity
Force = 1.12 g x 9.8 m/s2
Force = 11.04 N
Area = 1 cm2
Pressure = 11.04 N/1 cm2
Pressure = 11.04 Pa
Calculate the height of the ethylene glycol column
Atmospheric pressure = 1 atm
Height of ethylene glycol column = Pressure exerted by ethylene glycol/Atmospheric pressure
Height of ethylene glycol column = 11.04 Pa/1 atm
Height of ethylene glycol column = 11.04 cm
Therefore, the height of a column of ethylene glycol that would be supported by atmospheric pressure (1 atm) is 11.04 cm.
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How many atoms of oxygen are in hydronium?
Answers
Answer:
hi
Explanation:
23
Answer:
1 oxygen atom is in a hydronium
Explanation:
According to LibreTexts: The hydronium ion has a trigonal pyramidal geometry and is composed of three hydrogen atoms and one oxygen atom. There is a lone pair of electrons on the oxygen giving it this shape. The bond angle between the atoms is 113 degrees.
Write the test for the following Gases.
Co2, H2,Cl2, Br2,
SO2,
NO2,
Answers
Answer:
oh no!! I can't do this ;(
Explanation:
oopsie "BrO" I can't do this pleaseee.
don't be selfish next time and maybe people will help you...
The way Earth's rotation makes winds curve.
Answers
Answer:
it is called the prevailing westerlies
Explanation:
Why can metals be extracted using carbon
Answers
Antoine Lavoisier is known for which of the following? (Select all that apply)
a.
studying gravity
b.
discovering oxygen
c.
the theory of general relativity
d.
the law of conservation of mass
e.
the theory of natural selection
Answers
Answer:
b. discovering oxygen
d. the law of conservation of mass
Explain how steam causes burns by describing the transfer of heat.
Answers
Answer:
It will be : (in simple terms)
Condensation of hot steam or hot vapor on the cooler skin releases the water's latent heat of vaporization, rapidly raising the temperature of the skin which will result in steam burns.
Hope it helped
All the best!!
The atoms of which element bond to one another in chains, rings, and networks?
1.
barium
2.
carbon
3.
iodine
4.
mercury
Submit An:
Answers
Acids help digest proteins by: group of answer choices neutralizing them false partially denaturing them true preventing their absorption false cleaving pepsinogen true
Answers
Neutralizing them: FALSE.
What does denature mean?Some proteins in food denature when it is cooked. Because of this, cooked flesh solidifies and boiled eggs become hard. Egg whites, which are normally primarily egg albumins in water, are a famous example of denaturing in proteins. Egg whites are clear and liquid right out of the eggs.As a result of denaturation, many of the weak connections or bonds (such as hydrogen bonds) that give proteins their highly organized structure in their native (natural) state are broken. Most denatured proteins are insoluble and have a looser, more erratic structure.When part of the hydrogen bonds in a protein are broken, the protein loses some of its natural structure and becomes denatured. When weak hydrogen bonds are subjected to an acid or too much heat, they will break (like citric acid from lemon juice).Denaturation is the process that results in a protein losing its structure. Denaturation is typically brought on by the protein being subjected to external stressors such solvents, inorganic salts, exposure to acids or bases, and heat.Acids hp in the digestion of proteins by ;
NEUTRALISING THEM: FALSE.
PARTIALLY DENATURATING THEM: TRUE beacuse acids denature proteins and make them to lose their activity
PREVENTING THEIR ABSORPTION: FALSE
CLEAVING PEPSINOGEN:: TRUE pepsinogen os cleaved and then converted into active pepsin, which converts proteins into peptones and peptides.
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Which of the following best describes a pair of elements that will form an ionic bond?
A. C and H: Hydrogen easily loses electrons, and carbon gains them.
B. Li and O: Oxygen easily loses electrons, and lithium gains them.
C. P and Cl: Phosphorus easily loses electrons, and chlorine gains them.
D. Ca and Br: Calcium easily loses electrons, and bromine gains them.
(It's either A or D but I'm not sure)
Answers
Answer:
you answer would be d
Explanation:
Answer:
d, Ca and Br: Calcium easily loses electrons, and bromine gains them
Explanation:
edge 2021
(:
how does the strength of the resultant electric field change around like point charges
Answers
Answer:
The charge alters that space, causing any other charged object that enters the space to be affected by this field. The strength of the electric field is dependent upon how charged the object creating the field is and upon the distance of separation from the charged objects.
Mark me brainliest if I'm correct ;)
Balance the following equation by oxidation number method:
Zn + HNO3-----> Zn(NO3)2 + NO + H2O
Answers
By using the oxidation number approach, find the solution to the equation Zn + HNO3 4Zn(NO3)2 Plus N2O + H2O.
Zn HNO3 undergoes what kind of reaction?Chemical Reaction Type: We only have one displacement reaction for this reaction. Balanced Approaches: By employing diluted HNO3, the reaction between HNO3 with Zn will result in Zn(NO3) + H2.
Is the displacement reaction in Zn H2O?Balanced Approaches: You have a displacement reaction reaction in this zinc and water reaction. Cold water does not cause the response to occur. Water must be scorching hot or at least very hot. The number the hydrogen atoms just on output side of the formula must be correctly counted in order to balance the equation.
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: Define Vapor Pressure Group of answer choices The pressure exerted on the container of a gas and liquid The pressure exerted by a gas in a closed container The pressure exerted by a liquid in a closed container The pressure exerted by a gas over a liquid once the system has reached equilibrium.
Answers
Vapor pressure refers to the pressure exerted by a gas over a liquid once the system has reached equilibrium. Specifically, it is the pressure exerted by the vapor phase of a substance in a closed container when the rate of evaporation equals the rate of condensation. At equilibrium, the vapor pressure represents the tendency of the liquid molecules to escape into the gas phase.
The vapor pressure is influenced by factors such as temperature and the nature of the liquid. As temperature increases, the kinetic energy of the liquid molecules increases, leading to more evaporation and higher vapor pressure. Different liquids have different vapor pressures at the same temperature due to variations in intermolecular forces.
Vapor pressure plays a crucial role in various phenomena, including boiling, evaporation, and the behavior of volatile substances. It is an important property used in fields such as chemistry, thermodynamics, and material science.
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Which of these is Not a sign that a chemical change has occurred?
A. a loss of transparency
B. a temperature change
C. an unexpected color change
D. The formation of a precipitate
Answers
Answer: c
Explanation:
An unexpected color change is not a sign that a chemical change has occur. Thus option c is correct.
What is chemical change?A chemical change is defined as the transformation of one material into another, the formation of new materials with different properties, and the formation of one or more new substances.
There are basically five types of chemical reaction.
Combination reactionDecomposition reactionDisplacement reactionDouble displacement reactionSynthesis reactionThus, an unexpected color change is not a sign that a chemical change has occur. Thus option c is correct.
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What does it mean for a strong base to be in equilibrium?
o the position of equilibrium lies far to the right, with products being favored.
o the position of equilibrium lies far to the left, with products being favored.
there is a great deal of base and very few ions.
o there is an equal amount of reactants and products.
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Answers
The position of equilibrium lies far to the right, with products being favoured. Hence, option A is correct.
What is equilibrium?Chemical equilibrium is a condition in the course of a reversible chemical reaction in which no net change in the amounts of reactants and products occurs.
A very high value of K indicates that at equilibrium most of the reactants are converted into products.
The equilibrium constant K is the ratio of the concentrations of products to the concentrations of reactants raised to appropriate stoichiometric coefficients.
When the value of the equilibrium constant is very high, the concentration of products is much higher than the concentration of reactants.
This means that most of the reactants are converted into products and the position of equilibrium lies far to the right, with products being favoured.
Hence, option A is correct.
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Below is a list of standard reduction potentials (E0') for biological half cell reactions.
Succinate + CO2 + 2 H+ + 2 e- --> alpha-ketoglutarate + H2O -0.67 V
Oxaloacetate + 2 H+ + 2 e- --> malate -0.17 V
Fumarate + 2 H+ + 2 e- --> succinate -0.03 V
Using the above information, answer the following questions:
(A) Which metabolite would spontaneously reduce oxaloacetate (OAA)?
(B) Based on your answer for (A), write the two half cell reactions and the resulting balanced reaction for the reduction of OAA.
(C) Calculate the standard reduction potential for the reaction chosen in (B)
Answers
A reaction to be spontaneous,overall cell potential must be positive.
(A)The metabolite which would spontaneously reduce oxaloacetate (OAA) is:
alpha-ketoglutarate
(B)The two half cell reactions are as follows:
Reduction half reaction:
Oxaloacetate + 2 H+ + 2 e- --> malate
Oxidation half reaction:
alpha-ketoglutarate --> Succinate + CO2 + 2 H+ + 2 e-
Overall resulting balanced reaction for the reduction of OAA :
Oxaloacetate +alpha-ketoglutarate --> malate + Succinate + CO2
(C)the standard reduction potential for the reaction chosen in (B):
+0.67-0.17 = +0.50 V
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20 points! Help please
Answers
Answer: 2N2O3 -> 2N2 + 3O2
Explanation:
Answer:
2 2 3
Explanation:
2N2O3=2N2+3O2.. ....
5. in order to reduce evaporation and conserve water, do you think it would be better to water a lawn in the early morning or early evening?
Answers
The correct answer to this question is To prevent water from evaporating we should water in the morning.
As the plant has time to dry before the sun sets, morning watering is really preferable to evening watering. Water tends to rest in the soil, around the roots, and on the leaves at night, which facilitates insect proliferation, rot, and fungal growth. During the heat of the day it evaporates before it can reach the roots, water your plants early in the morning or late at night. To help the soil retain moisture, sprinkle it with water-retentive crystals.
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Carbon cycle – What are the main reservoirs
of the carbon cycle? Where do the inorganic and organic carbon
cycles interact? What are the major differences and similarities
between the inorganic and organic carbon?
Answers
The main reservoirs of the carbon cycle are the atmosphere, oceans, land (including vegetation and soils), and fossil fuels. In these reservoirs, carbon exists in both inorganic and organic forms.
The inorganic carbon cycle involves the exchange of carbon dioxide (CO2) between the atmosphere and oceans through processes like photosynthesis and respiration.
Organic carbon, on the other hand, is found in living organisms, dead organic matter, and soil organic matter. It is cycled through processes such as decomposition and consumption by organisms. The interactions between the inorganic and organic carbon cycles occur primarily in the biosphere, where photosynthesis converts inorganic carbon into organic carbon compounds. While inorganic carbon is primarily in the form of CO2, organic carbon is present in complex organic molecules. Both forms of carbon play crucial roles in energy transfer, nutrient cycling, and climate regulation.
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What is an ethical topic?
Answers
Answer:
its an issue
Explanation:
google words not mine
"ethical issue. A problem or situation that requires a person or organization to choose between alternatives that must be evaluated as right (ethical) or wrong (unethical). ... When considering this problem, lawyers may do well to ignore the letter of the law and realize that it is, at its heart, an ethical issue."
How many valence electrons will atoms in group 16 of the periodic table have?
Answers
Answer:
6 valence electrons
Explanation:
pls help!!!!!!!!!!!!!!
Answers
The given reaction is the calcium carbide reaction of calcium hydroxide with water to produce acetylene.
How much C2H2 AND Ca(OH)2 was produced?Chemical equations must obey the law of conservation of mass and the law of constant proportions. That is, the reactant and product sides of the equation must contain the same number of atoms of each element or compound.The given reaction is the calcium carbide reaction of calcium hydroxide with water to produce acetylene.The balanced equation is CaC2+2H2OCa(OH)2+C2H2.
Molar mass of acetylene, C2H2 = 2x12+2x1 = 26 g/mol
we get 64 g of CaC2 becomes 26 g of C2H2. 5.0g CaC2..
Molecular weight of Ca(OH)2=1(atomic weight of Ca)+2(atomic weight of O)+2(atomic weight of H)=40+2(16)+2(1)=40+32+2=74.
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