is a tool used by chemists to answer questions about particle and mole relationships.
Answers
A tool used by chemists to answer questions about particle and mole relationships is the concept of the mole, which allows for calculations involving chemical reactions, stoichiometry, and molecular formulas.
Particle theory of matter is used to explain the behavior of particles in matter. In this theory, matter is assumed to be made up of small particles that are in constant motion. These particles are either atoms or molecules. The study of particle theory includes topics such as particle collisions, particle interactions, and the motion of particles. The concept of moles is also an important part of the study of particle theory.
Moles are used to express the number of particles in a substance. One mole of a substance contains Avogadro's number of particles (6.02 ×\(10^{23}\)particles). Moles are used by chemists to relate the number of particles in a substance to the mass of the substance. This is known as the mole relationship. Chemists use the mole relationship to determine the amount of substance required for a chemical reaction.
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Answer: Stoichiometry is a tool used by chemists to answer questions about particle and mole relationships.
Explanation:
Related Questions
help please I don’t understand and this is due tomorrow.
Answers
Answer:
9.2% is the answer
Explanation:
In this question asking for the percent error of the students calculated density. The formula that will be given;
density = 9.78g/cm^3
d = 9.78g/cm^3
accepted is on the RT table S = 8.96g/cm^3
%error = (measured - accepted)/accepted * 100%
%error = (9.78 - 8.96/8.96) * 100%
%error = 9.15% or approximately 9.2%
what will be the result of the reaction
(CH3COO)2+redP +Cl2
Answers
Answer:
(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl
Explanation:
This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.
Evergreen trees have leaves that stay green all year long. Many evergreens have needles that remain on the tree through changes in the seasons, unlike broad leaf trees that lose their leaves in preparation for winter. How might this adaptation help evergreen trees survive in the taiga, a cold biome with long, dark winters?
Answers
Answer:
See explanation
Explanation:
The leaves or needles of evergreen trees lose less water than other kinds of leaves. This means that they are better able to conserve water in the taiga, a cold biome with long, dark winters.
These conifers possess adaptations that are able to help them survive the long, cold winters and short summers in a typical taiga biome since their needles contain very little sap, which also helps prevent them from freezing.
Help me pleaseeeeeeeeeeeeeeeeeeeeeeeeee
Answers
Answer:
Try googling it that will help. If not I don't know?
Explanation:
100.0 ml of a 0.840 m solution of kbr is diluted to 500.0 ml. what is the new concentration of the solution?
Answers
The concentration of the KBr solution is 0.168 M.
What is molarity?
The quantity of a substance in a given volume of solution is known as its molarity (M). The number of moles of a solute each liter of a solution is known as molarity. The molar concentration of a solution is another term for molarity.
Explanation:
M1V1 = M2V2,
where M1 is the initial concentration,
V1 is the initial volume,
M2 is the concentration,
V2 is the total final volume.
Have to find the initial and final volume of the solution,
V1=100/1000=0.1
V2=500/1000=0.5
By rearranging the above equation, we get
M2=M1V1/V2
=0.840 x 0.1/0.5=0.168 M.
Therefore, the concentration of the KBr solution is 0.168 M.
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adding+specimen+scrapings+to+10%+koh+to+show+the+presence+of+sclerotic+bodies+that+resemble+copper+pennies+is+useful+in+the+diagnosis+of:
Answers
Adding specimen scrapings to 10% KOH to show the presence of sclerotic bodies that resemble copper pennies is useful in the diagnosis of tinea versicolor.
Tinea versicolor is a superficial fungal infection caused by the yeast Malassezia. The characteristic coppery or hypopigmented (lighter) spots seen in tinea versicolor are due to the accumulation of fungal cells on the skin. These cells, known as sclerotic bodies or spaghetti and meatballs, are visualized when the specimen scrapings from the affected area are mixed with 10% KOH. The KOH helps to dissolve the keratin in the skin, making it easier to identify the fungal elements under a microscope.
This diagnostic method is particularly effective for tinea versicolor because the presence of these distinctive sclerotic bodies confirms the diagnosis. Other skin conditions may have different appearances or lack these specific fungal elements when examined using the KOH preparation technique. Therefore, this test can aid in differentiating tinea versicolor from other skin conditions with similar clinical manifestations.
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Trevor dissolves sodium hydroxide pellets in a beaker of water at room temperature, and notes that the beaker becomes warm. Which correctly designates the signs of Delta. H, Delta. S, and Delta. G for this process? Delta. H > 0, Delta. S > 0, and Delta. G < 0 Delta. H < 0, Delta. S > 0, and Delta. G < 0 Delta. H > 0, Delta. S > 0, and Delta. G > 0 Delta. H < 0, Delta. S < 0, and Delta. G > 0.
Answers
The change in energy for the reaction is \(\Delta H\) < 0, \(\Delta S\) > 0, and \(\Delta G\) < 0. Hence, option B is correct.
The chemical reaction with the loss of energy is exothermic reactions, and the reaction with the gain of energy is an endothermic reaction.
The change in enthalpy for the reaction is given by \(\Delta H\), the change in entropy is given by \(\Delta S\), and the change in free energy is given by \(\Delta G\).
What is the energy change in the exothermic reaction?The energy in the NaOH dissolution is released, which turns the solution warm.
The release of the energy by the sample in dissolution makes the value \(\Delta H\) negative.Thus, \(\Delta H\) is < 0 for the reaction.
The release of the energy results in increased disorder in the reaction mixture. The value \(\Delta S\) becomes positive.Thus, the \(\Delta S\) is > 0 for the reaction.
The reaction for the exothermic process is spontaneous. Thus, the value \(\Delta G\) is negative for the reaction.Thus, the \(\Delta G\) < 0.
Hence. the change in energy for the reaction is \(\Delta H\) < 0, \(\Delta S\) > 0, and \(\Delta G\) < 0. Hence, option B is correct.
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metal ions such as zn2+ and fe3+ are often needed by enzymes as
Answers
Metal ions such as Zn²⁺ and Fe³⁺ are often needed by enzymes as cofactors or prosthetic groups that facilitate enzymatic reactions.
These metal ions assist enzymes by stabilizing their structure, enhancing substrate binding, and participating directly in chemical reactions to accelerate catalysis. They help the enzymes achieve the necessary specificity and efficiency required for various biological processes.
For instance, Zn²⁺ is involved in the active sites of several metalloenzymes, such as carbonic anhydrase and carboxypeptidase. It typically acts as a Lewis acid, accepting electron pairs from substrates and facilitating the nucleophilic attack on the substrate. On the other hand, Fe³⁺ is found in enzymes like cytochrome P450 and catalase. It plays a vital role in redox reactions, participating in the transfer of electrons and enabling the conversion of substrates to products.
Overall, metal ions such as Zn²⁺ and Fe³⁺ are essential for proper enzyme function, as they help ensure the precise and efficient execution of various enzymatic processes vital to maintaining biological systems.
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if you are curious at to why so many of ur family members have certain hair or eye color, you might want to look at... A. Astrology... B. A family tree... C. Heredity... D.Geometry
Answers
Answer:
c) hereditary
Explanation:
This means that if your parents had one eye colour, you'll most likely have the same one because you share the same genes, and it's passed down to you.
What are the five properties of matter?
Answers
Explanation:
Physical Properties
color (intensive)
density (intensive)
volume (extensive)
mass (extensive)
boiling point (intensive): the temperature at which a substance boils.
melting point (intensive): the temperature at which a substance melts.
Prokaryotes store their DNA in a nucleus.
True
or false
Answers
is it possible for rocks to keep growing and spread if not broken down
Answers
Answer:
The rock helps smother unwanted plant growth, but some stubborn weeds find a way to thrive. Weed prevention starts before you put the rocks down and continues with regular maintenance to stop a large-scale weed invasion.
Explanation:
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Hello! can someone explain to me how to solve this?How many moles of tungsten atoms are in 4.8 * 10^25 atoms of tungsten?
Answers
How many moles of tungsten atoms are in 4.8 * 10^25 atoms of tungsten?
Avogadro's number is the number of particles that we have in one mol of particles. It is 6.022 *10^23. For example: in 1 mol of atoms there are 6.022*10^23 atoms.
It's like a dozen. When we say a dozen atoms, we mean 12 atoms. So, when we say a mol of tungsten atoms, we mean 6.022 *10^23 atoms of tungsten.
1 mol of atoms of tungsten = 6.022 *10^23 atoms of tungsten
We will use that relationship to find the number of moles of tungsten atoms that we have in 4.8 *10^25 atoms of tungsten.
number of moles of tungsten atoms = 4.8 *10^25 atoms * 1 mol of atoms/(6.022 *10^23 atoms)
number of moles of tungsten atoms = 79.7 moles = 8 *10^1 moles
number of moles of tunsten atoms = 8.10^1 moles
Answer: b) 8*10¹ moles
What is one way to increase the concentration of a solution
Answers
Answer:
Increasing the solute
Explanation:
The simplest way to change the concentration would be to change the amount of solute or solvent in the solution. Increasing the solute would increase the concentration. Increasing the solvent would decrease the concentration. For instance, if your lemonade was too tart, you would add more water to decrease the concentration.
The density of Lead is 11.4 g/ml. If a sample of Lead has a mass of 91 g, what is the
volume of this sample of Lead?
Answers
Answer:
Volume of Lead = 7.98 ml³
Explanation:
Given:
Density of Lead = 11.4 g/ml
Mass of Lead = 91 g
Find:
Volume of Lead
Computation:
Volume = Mass / Density
Volume of Lead = 91 / 11.4
Volume of Lead = 7.98 ml³
The allele for purple flower color is most likely
A. dominant to the allele for white flower color.
B. recessive to the allele for white flower color.
C. codominant with the allele for white flower color.
D. incompletely dominant with the allele for white flower color.
Answers
A blue food coloring tablet is placed in a cup of vinegar and water. The blue tablet will dissolve and spread evenly throughout the liquid.
QUESTIONS
Is this Diffusion or Osmosis?
Does this require energy?
Low to High or High to Low?
Answers
From the blue food coloring tablet experiment, we can conclude that:
This is a diffusion process.It does not require energy.The diffusion happens from the high to low concentration.How does diffusion happen?The process occurring when a blue food coloring tablet is placed in a cup of vinegar and water is diffusion. This is because diffusion is the movement of molecules from an area of high concentration to an area of low concentration, which is what happens when the tablet dissolves and the color spreads evenly throughout the liquid. Osmosis, on the other hand, is the movement of water molecules across a selectively permeable membrane.
This process does not require energy in the form of ATP, as it is a passive transport process that relies on the natural kinetic energy of the molecules. The molecules move randomly, but the overall effect is a movement from high to low concentration, resulting in the even distribution of the dissolved blue tablet in the liquid.
In summary, when a blue food coloring tablet dissolves and spreads evenly throughout a cup of vinegar and water, the process is known as diffusion. It does not require any external energy input and occurs as molecules move from an area of high concentration to an area of low concentration.
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Interpret the given equation in terms of relative number of representative particles, numbers of moles, and masses of reactants and products.
2K (s) + 2H20 (l)---> 2KOH (aq) + H2 (g)
Answers
The molar mass of KOH is 56.11 g/mol, and the molar mass of H2 is 2.02 g/mol. The mass of KOH produced by the reaction of one mole of potassium and one mole of water is 56.11 g, and the mass of H2 produced by the reaction of one mole of potassium and one mole of water is 2.02 g.
The equation indicates that two atoms of potassium react with two molecules of water to form two molecules of potassium hydroxide and one molecule of hydrogen gas.
This implies that the ratio of moles of potassium to water is 1:1, and the ratio of moles of potassium hydroxide to hydrogen is 2:1. The molar mass of K is 39.10 g/mol, and the molar mass of H2O is 18.02 g/mol. Thus, the mass of K that reacts with one mole of water is 39.10 g. Similarly, the mass of water that reacts with one mole of potassium is 18.02 g.
The equation relates the relative numbers of representative particles (atoms, molecules) and moles of reactants and products, as well as the masses of reactants and products involved in the reaction. This provides a basis for quantitative analysis of the reaction, such as determining the amount of product produced from a given amount of reactants.
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You should have noticed that the Styrofoam ball rolled slightly towards the rod and then appeared to be lifted above the pan. Which type of force explains why the rod was able to lift the Styrofoam ball?
-static electricity
-gravity
-magnetism
-electromagnetism
Answers
Answer:
static electricity
Explanation:
25. The reaction catalyzed by the enzyme aldolase has a G˚' ≈ +23 kJ/mol. In muscle cells, the reaction proceeds in this same, forward direction. How can this occur?
a. This G˚' means it is thermodynamically favored.
b. The enzyme changes the ∆G of the reaction in cells to something favorable.
c. The concentration of reactant(s) must be significantly greater than product(s) in cells.
d. The concentration of product(s) must be significantly greater than reactant(s) in cells.
Answers
In muscle cells, the reaction proceeds in the same way when enzyme changes the ∆G of the reaction in cells to something favorable. Option B is correct.
The fact that the reaction catalyzed by aldolase has a positive standard free energy change (∆G˚' ≈ +23 kJ/mol) indicates that the reaction is thermodynamically unfavored under standard conditions. However, in muscle cells, the reaction proceeds in the forward direction, indicating that the actual free energy change (∆G) of the reaction in cells is negative.
The most likely explanation for this is that the enzyme aldolase catalyzes the reaction in such a way that it lowers the activation energy required for the reaction to proceed, making it kinetically favorable. This does not change the thermodynamics of the reaction, but it allows the reaction to occur at a reasonable rate.
Hence, B. is the correct option.
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a piece of cadmium with a mass of 25.95 g is submerged in 46.3 cm3 of water in a graduated cylinder. the water level increases to 49.3 cm3. the correct value for the density of cadmium from these data is:
Answers
The correct value for the density of cadmium from these data is 8.7 g/cm³
The correct answer is E.
Density is the mass of a material substance per unit volume. d = M/V, where d is density, M is mass, and V is volume, is the formula for density. Grams per cubic centimeter are a typical unit of measurement for density.
Mass = 25.95g
Volume of water before = 46.3 cm³
Volume of water after = 48.9 cm³
volume cadmium can be calculate as follows
Volume of Cadmium = Volume after - Volume before = 49.3 - 46.3 = 3 cm³
after we got the volume we can calculate the density as follows:
Density = Mass / Volume
Density = 25.95g / 3cm³= 8.65 g/cm³ ≈ 8.7 g/cm³
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BALANCED WORD EQUATION Aluminium carbonate + hydrochloric acid -->
Answers
Answer: 2Al+6HCl→2AlCl3+3H22Al+6HCl → 2AlCl3 + 3H2
Explanation:
How is the process of mitosis essential to the survival of an organism?
Answers
Answer:
Explanation:
Mitosis is crucial to this process. Mitosis is the reason we can grow, heal wounds, and replace damaged cells. Mitosis is also important in organisms which reproduce asexually: this is the only way that these cells can reproduce. This is the one key process that sustains populations of asexual organisms.Jul 22, 2020
Mitosis has an impact on life because it regulates the growth and regeneration of billions of cells within the body.
Absent of mitosis, cell material would degrade quickly and cease to function correctly. We can develop, repair wounds, and replace damaged cells because of mitosis. Mitosis is a vital step for an organism's existence. Mitosis is the only mechanism that allows asexual creatures to survive.Learn more:
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manganese-56 is a beta emitter with a half-life of 2.6 hours. what is the mass of manganese-56 in a 1.0mg sample remaining at the end of 10.4 hours?
Answers
The mass of manganese-56 in a 1.0mg sample remaining at the end of 10.4 hours is 0.0025mg
What is Half Life?
Half-life, in radioactivity, is the amount of time needed for half of a radioactive sample's atomic nuclei to decay (change spontaneously into other nuclear species by emitting particles and energy), or, alternatively, the amount of time needed for a radioactive material's rate of disintegrations per second to decrease by half.
Cobalt-60, a radioactive isotope used in radiotherapy, has a half-life of 5.26 years, for instance. As a result, after that time, a sample that contained 8 g of cobalt-60 at first would only have 4 g of cobalt-60 and would produce half as much radiation. Only 2 g of cobalt-60 would remain in the sample after an additional delay of 5.26 years. The initial sample's mass and volume don't change noticeably,
10.4/2.6= 4
The mass of manganese-56 in a 1.0mg sample remaining at the end of 10.4 hours is 0.0025mg
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pls solve this question
b) Briefly explain why Waste Electrical \& Electronic Equipment (WEEE) regulations are important? (3 marks)
Answers
Answer: they are important for one, they cant be combined
Explanation: i cant really explain
what are the efficient things needed for a village
Answers
Answer:
Those aspects which are something a village needs are specified beneath.
Explanation:
Things being equally necessary to make living simpler and therefore more enjoyable. The government has promised to continue providing basic facilities to either an unpopulated location, including such roads, drinkable water, as well as electric power. Therefore, throughout the village, certain things accessible with maximum variety and quality that have become the basic requirements for this human existence.In which orbitals would the valence electrons for carbon (C) be placed?
Answers
Answer: orbitals supernumerary
Explanation:
Answer:
both S orbital and p orbitals
Explanation:
took the exam got the question right.
7. if 45.52 ml of a potassium permanganate solution is needed to titrate 2.145 g of iron(ii) ammonium sulfate hexahydrate, calculate the molarity of the kmno4 solution.
Answers
The molarity of a solution is calculated from the number of moles of solute and the volume of solution in liters. The molarity of potassium permanganate solution 2.145 g of iron(ii) ammonium sulfate hexahydrate is 0.121 M.
What is molarity ?Molarity is used to represent the concentration of a solution. It is the ratio of number of moles of solute to the volume of solution in litres. Molarity depends on the temperature also.
The number of moles of a solute can be calculated from the molar mass and taken weight of the solute.
The molar mass of iron(ii) ammonium sulfate hexahydrate = 392.1 g/mol
Taken weight of solute = 2.145 g.
Therefore, the number of moles of iron(ii) ammonium sulfate hexahydrate = 2.145 / 392.1
= 0.0054 moles.
Now, the molarity of the solution is calculated as follows:
Molarity of solution =( no.of moles of iron(ii) ammonium sulfate hexahydrate ) / volume
= 0.0054 /0.045 L
= 0.121 M
Hence, The molarity of potassium permanganate solution 2.145 g of iron(ii) ammonium sulfate hexahydrate is 0.121 M.
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In a car piston shown above the pressure of the compressed gas (red) is 5.00 atm if the area of the piston is 0.0760 m2 what is the forces exerted by the gas on the piston in newtons (N)
Answers
The force exerted by the gas on the piston in newtons (N) is 38503.5N.
How to calculate force from pressure?Pressure is the amount of force that is applied over a given area divided by the size of this area.
This means that the pressure can be calculated as follows:
P = F/A
Where;
P = pressure (Pa or N/m²)F = force (N)A = area (m²)According to this question, in a car piston, the pressure of the compressed gas (red) is 5.00 atm. If the area of the piston is 0.0760 m², the force exerted can be calculated as follows:
506625N/m² = F/0.0760m²
F = 38503.5N
Therefore, the force in Newtons is 38503.5N.
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Which ion is a cation? A. Ca2+ B. Cl2 C. S2- D. Br-
Answers
Answer:
Ca2+ is cation
Explanation:
Because cation contain positive charge.