Answer:
Insulin and glucagon are the hormones that cause blood glucose (blood sugar) preserved in a narrow range. The pancreas serves as the central part of this process. Secreted by the pancreas are both insulin and glucagon. Determined by the production of insulin and glucagon, people can find out whether someone may have diabetes, hypoglycemia, low blood pressure, etc. Insulin or glucose can be prescribed to victims of those listed issues, it is mostly used to balance out the level of glucagon and insulin to try to stop the problem.
Which statement best describes the oxidation numbers of the atoms found in magnesium chloride?
A. Magnesium has a 2- oxidation number and chlorine has a 1+ oxidation number.
B. Magnesium has a 2- oxidation number and chlorine has a 2+ oxidation number.
C. Magnesium has a 2+ oxidation number and chlorine has a 1- oxidation number.
D. Magnesium has a 1+ oxidation number and chlorine has a 1- oxidation number.
Answer- The correct choice of answer out of all would be option C.
Explanation
The given substance magnesium chloride made out of combination of chlorine and magnesium is a compound. Where magnesium has two positive ions and chlorine has two negative ions which trigger the reaction.
Hence the oxidation of the 2 positive ions of Magnesium takes place and reduction of the Negative Ion chlorine has to offer attract and stabilize each other by forming the compound .
16. In a reaction that has reached equilibrium,
a. The forward and reverse reactions are occurring at the same rate.
b. The reactants and products are in equal concentrations.
C. The forward reaction has gone further than the reverse reaction.
d. There are equal numbers of atoms on both sides of the equation.
e. A, B, and D are correct.
Answer:
i think b
Explanation:
Answer:
None of the above.
Explanation:
a, c, and d are correct.
a. In a reaction at equilibrium, the forward and reverse reactions are occurring at the same rate.
c. If the position of equilibrium lies to the right, the forward reaction has "gone further" than the reverse reaction.
d. Even if the position of equilibrium is far to the right, the balanced equation for the equilibrium has equal numbers on each side of the equation. For example, in the equilibrium reaction 2H₂ + O₂ ⇌ 2H₂O, the position of equilibrium is far to the right but there are equal atoms on each side of the reaction.
b. is wrong. It is exceptionally rare for reactants and products to have the same concentrations at equilibrium.
A 20 liter cylinder of helium at a pressure of 150 atm and a temperature of 27°C is used to fill a balloon at 1.00 atm and 37°C. What is the volume of the balloon?
A.
0.14 liters
B.
3000 liters
C.
2900 liters
D.
2400 liters
E.
3100 liters
Answer:The number of moles will remain the same in the two cases
so we can equate using ideal gas equation which is PV =nRT
V2 = 3100 L
Explanation:
Answer: E. 3100 liters
Explanation:
Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.
The combined gas equation is,
[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]
where,
[tex]P_1[/tex] = initial pressure of gas = 150 atm
[tex]P_2[/tex] = final pressure of gas = 1 atm
[tex]V_1[/tex] = initial volume of gas = 20 L
[tex]V_2[/tex] = final volume of gas = ?
[tex]T_1[/tex] = initial temperature of gas = [tex]27^oC=273+27=300K[/tex]
[tex]T_2[/tex] = final temperature of gas = [tex]37^oC=273+37=310K[/tex]
Now put all the given values in the above equation, we get the final pressure of gas.
[tex]\frac{150atm\times 20L}{300K}=\frac{1atm\times V_2}{310K}[/tex]
[tex]V_2=3100L[/tex]
Therefore, the volume of the baloon is 3100 L.
What separation technique would most likely be used if a solvent were saved?
Answer:
Distillation
Explanation:
If the solute is a solid or a liquid with a boiling point at least 30 °C different from that of the solvent, you can use the technique of distillation.
The solvent will boil before the solid or a higher-boiling liquid.
A liquid solute with a lower boiling point than the solvent will boil off first, and then you can distill off the solvent.
Answer:
Distillation
Explanation:
Distillation is a process known long ago and according to some authors was created by the Alchemists at a time where Chemistry was not yet recognized as Science and was closely linked to religious precepts.
Basically the distillation process is a process of physical separation and is used to separate homogeneous mixtures from heating. To separate a solid-liquid type mixture we use simple distillation and to separate liquid-liquid mixtures we use fractional distillation.
How many grams of oxygen gas are contained in a 15 L sample at 1.02 atm and 28°C? Please show your work.
Answer:
0.019 g.
Explanation:
Firstly, we need to find the no. of moles of oxygen gas:We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm (P = 1.02 atm).
V is the volume of the gas in L (V = 15.0 L).
n is the no. of moles of the gas in mol (n = ??? mol).
R is the general gas constant (R = 0.0821 L.atm/mol.K),
T is the temperature of the gas in K (T = 28°C + 273 = 301.0 K).
∴ n = PV/RT = (1.02 atm)(15.0 L)/(0.0821 L.atm/mol.K)(301.0 K) = 0.62 mol.
To find the mass of oxygen gas, we have:no. of moles = mass/molar mass.
∴ mass of oxygen = (no. of moles)(molar mass) = (0.62 mol)(32.0 g/mol) = 0.019 g.
Energy release is to condensation as energy input is to _________.
A. deposition
B. sublimation
C. freezing
D. dispersion
Answer:
sublimation
Explanation:
the other choices release energy
Hey mate here's your answer
Ans: B, Sublimation. This is because you must input energy in order to get a solid to go directly to a gas while the other ones release energy (and dispersion has nothing to do with these at all)
hope so the following may help you thanks
In any engineering design problem, the first step is to understand the problem and identify one or more possible solutions. In this task, you’ll analyze the problems you face as the chemical engineer challenged with setting up the ammonia-making process. Recall the chemical equation for producing ammonia:
N2 + 3H2 ⇌ 2NH3 + energy
How can you change the chemical equilibrium to benefit the company? What benefits will be realized?
Answer:
rising pressure and decreasing temperature
Explanation:
Reversible reactions have a bit practical interest, but in some cases the technological benefit or profitability of production requires a shift in the equilibrium of a reversible reaction.
Increasing pressure
With increasing pressure on this system, the concentration of substances increases. In this case, the balance will shift towards smaller volumes. On the left side of the equation, two volumes of nitrogen react with one volume of hydrogen. On the right side of the equation there are two volumes of ammonia, i.e. the number of volumes on the right side of the equilibrium reaction is less than on the left and, therefore, with increasing pressure, the reaction equilibrium will shift to the right.
Decreasing temperature
When the temperature rises, the equilibrium shifts towards the endothermic reaction, and when the temperature decreases, towards the exothermic reaction and the reaction given above is the exothermic.
To optimize the yield of ammonia in the Haber process, increasing system pressure shifts the chemical equilibrium towards producing more NH3. This results in a higher production rate and economic efficiency, aligning with industrial goals.
Explanation:In the context of chemical engineering, changing the chemical equilibrium in the production of ammonia (NH3) from nitrogen (N2) and hydrogen (H2) gases can highly benefit a chemical company. The Haber process is grounded in the reaction: N2 + 3H2 ⇌ 2NH3 + energy. By adjusting conditions such as pressure and temperature, the yield of ammonia can be increased according to Le Chatelier's Principle.
To shift the equilibrium towards the formation of more NH3, increasing the pressure of the system is effective because the reaction results in a decrease in the number of gas particles. According to the balanced chemical equation, we start with 1 mole of nitrogen and 3 moles of hydrogen to get 2 moles of ammonia. Since the reaction produces fewer gas particles as products, an increase in pressure will favor the production of ammonia, thus potentially increasing the yield and efficiency of the process.
Increasing the pressure is also practical considering industrial production constraints. The benefits of manipulating the chemical equilibrium in this manner include increased production rates and improved economic efficiency, as higher yields of ammonia mean more effective use of feedstock gases, which contributes to cost savings for the company.
which of these best explains the ability of small insects to walk on the surface of still water?
a.) water molecules at the surface experience fewer hydrogen bonds than water molecules within the liquid
b.) the insects’ feet are coated with ionic compounds
c.) water has a very high specific heat
d.) water molecules near the surface produce more buoyant force than water molecules within the liquid
THE ANSWER WAS NOT D.
Answer:
A.
Explanation:
Smaller insects can walk on water due to surface tension. The force that a smaller insect makes on the water is less than the water and as such the bug will "float."
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10pt if given the correct answer I will mark you as brainliest
An ordered list of chemical substances is shown.
Chemical Substances
1 Al
2 O2
3 H2O
4 SO2
5 Al2O3
Which substances in the list can be used to write a complete combustion reaction?
A- 1, 2, and 3
B- 1, 4, and 5
C-1, 2, and 5
Answer:
C
Explanation:
4(Al)+3(O2)==2(Al2O3)
Also, i'm in sixth grade just took a leson on a text book so may be wrong but i'm prety sure it's the correct nswer because x(Al)+y(O2) can not make hydregen for the h2o and for b, al+so2 = al2O3 makes sense but where did the sulfer go?
Answer:
C- 1, 2 and 5
Explanation:
There are many reactions that occur in the world, and one of the more important ones are known as combustion reactions. These reactions always involve the reaction between oxygen and another element/molecule/compound. So automatically, option 2 needs to be correct, so any answer that does not have option 2 in it (B) is incorrect.
Another important factor of combustion reactions is that they give off heat, because they are exothermic reactions, however since there is no indication of energy levels, so the answer in this question cannot be determined through that method.
One important law in all reactions is the conservation of matter, so whatever atoms enter the chemical reaction, have to exit the chemical reaction (no atoms can suddenly appear without having been there originally. For example, if only oxygen and hydrogen enter a reaction, only a product with oxygen and hydrogen can exit the reaction, it is impossible to have a product containing chlorine, if no chlorine was part of the reactants). By this logic, it is impossible to have water (H₂O) as a product, if the reactants are 1 and 2 (Al and O₂), hence option A is incorrect.
The only other option left is option C, and this option is correct because the overall balanced reaction would look like such:
4Al + 3O₂ --> 2Al₂O₃
This reaction obeys the law of conservation of matter, hence, Option C is correct.
What type of radiation is emitted when polonium-212 forms lead-208?
Answer:
Alpha radiation
Explanation:
Polonium-212 decays to lead-208 by emission of an alpha particle according to the following equation.
²¹²₈₄ Po →²⁰⁸₈₂ Pb +⁴₂ He + Energy.
Te alpha particle is a helium particle. It has 2 protons and 2 neutrons.
55. Streptomycin is a derivative of a
a. peptides
b. Carbohydrates
d. Terenes
c.Purines
Answer:
I believe it's B.
Explanation:
Hope my answer has helped you!
Given [OH-] = 5.5 x 10-10M Find: [H3O+] and pH Is this acidic, basic or neutral?
Answer:
Explanation:
The hydroxyl ion concentration of the solution [OH⁻] is 5.5 x 10⁻¹⁰M
Problem:
To find [H₃O⁺] and the pH of the solution:
We know that the ionic product of water has been experimentally determined and it is given for a pure water as 1.0 x 10⁻¹⁴mol²dm⁻⁶ at 25°C.
So : [H₃O⁺][OH⁻]= 10⁻¹⁴mol²dm⁻⁶ at 25°C
To find the concentration of the hydroxonium ions:
[H₃O⁺] = [10⁻¹⁴] / [OH⁻]
[H₃O⁺] = 10⁻¹⁴ / 5.5 x 10⁻¹⁰ = 1.8 x 10⁻⁵M
To find the pH of the solution, we know that ;
pH = -log[H₃O⁺] = -log 1.8 x 10⁻⁵ = 4.74
The solution is acidic
what type of bonding is butane
What did Bohr’s model of the atom do that Rutherford’s model did not?
It established that electrons move around the nucleus.
It identified the charge of the nucleus.
It established that a large volume of space surrounds the atomic nucleus.
It focused on the location and energy of electrons.
Answer:
The last option
Explanation:
The Bohr model was an attempt to explain atomic hydrogen's spectrum. This was done by establishing energy levels of separate electron orbits in the atom.Thos model was followed by the Schrödinger model.
Bohr's model built upon Rutherford's by establishing that electrons move around the nucleus in certain paths or 'shells', and focusing more on the location and energy of electrons, a crucial component in understanding atomic structure and behavior.
Explanation:Bohr’s model added new elements to Rutherford’s model, demonstrating a better understanding of the atom's structure and behavior. One of the key differentiating factors was Bohr's idea that electrons orbit around the nucleus in set paths (or energy levels).
While Rutherford's model did identify the nucleus as positively charged and indicated that a large volume of space surrounds it, it didn't provide a specific path for the electrons' movement. The Bohr model, in contrast, presented the concept of quantized energy levels. According to this model, electrons could occupy specific energy levels and could jump between these levels by absorbing or emitting discrete amounts of energy.
So, to answer your question, Bohr's model, unlike Rutherford’s, established that electrons move around the nucleus in certain paths or 'shells', and it focused more on the location and energy of electrons, which was key to understanding atomic structure and behavior.
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What is the correct way to represent 5600 L using scientific notation?
Answer:
5.6 * 10^3
this is because when thinking about scientific notation you know that you have to include a decimial and how many times you are moving it and whether it is a negative of a positive.
this means that you would take 5600 and you would put the decimal inbetween 5 and 6 because they are significant numbers and then you would have to figure out how many places to the right you need to go inorder to make it 5600
meaning you have to move it three times therefore it becomes
5.6 * 10^3
[tex]5.6*10^{3}[/tex] is the correct way to represent 5600 L using scientific notation.
What is scientific notation?In case your decimal quantity is extra than 10, rely on the number of instances of the decimal movements to the left, and upload this variety to the exponent. division: To divide numbers in medical notation, first divide the decimal numbers. Then subtract the exponents of your strength of 10.
How do you change from standard form to clinical notation?To alternate more than a few from scientific notation to traditional form, circulate the decimal point to the left (if the exponent of ten is a poor variety), or to the right (if the exponent is fine). You must pass the point as often as the exponent indicates. Do no longer write the strength of ten anymore.
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A sample of gas is in a rigid cylinder with a movable piston. The pressure of the gas is kept constant. If the Kelvin temperature of the gas is
doubled, the volume of the gas is
O 1.
2
halved
doubled
tripled
unchanged
Submit Retry Answer
Previous
Answer:
The volume will double, if the temperature of the gas is doubled as temperature and volume are directly proportional.
Answer:
If the Kelvin temperature of the gas is doubled, the volume of the gas is doubled.
Explanation:
To calculate the final volume of the system, we use the equation given by Charles' Law.
This law states that volume of the gas is directly proportional to the temperature of the gas at constant pressure.
Mathematically,
[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex] (at constnat pressure)
where,
[tex]V_1\text{ and }T_1[/tex] are the initial volume and temperature of the gas.
[tex]V_2\text{ and }T_2[/tex] are the final volume and temperature of the gas.
We are given:
[tex]T_2=2T_1[/tex]
[tex]V_2=?[/tex]
[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]
[tex]\frac{V_1}{T_1}=\frac{V_2}{2T_1}[/tex]
[tex]V_2=2V_1[/tex]
If the Kelvin temperature of the gas is doubled, the volume of the gas is doubled.
55 L of a gas at 25oC has its temperature increased to 35oC. What is its new volume?
Answer:
Approximately 56.8 liters.
Assumption: this gas is an ideal gas, and this change in temperature is an isobaric process.
Explanation:
Assume that the gas here acts like an ideal gas. Assume that this process is isobaric (in other words, pressure on the gas stays the same.) By Charles's Law, the volume of an ideal gas is proportional to its absolute temperature when its pressure is constant. In other words
[tex]\displaystyle V_2 = V_1\cdot \frac{T_2}{T_1}[/tex],
where
[tex]V_2[/tex] is the final volume, [tex]V_1[/tex] is the initial volume, [tex]T_2[/tex] is the final temperature in degrees Kelvins.[tex]T_1[/tex] is the initial temperature in degrees Kelvins.Convert the temperatures to degrees Kelvins:
[tex]T_1 = \rm 25^{\circ}C = (25 + 273.15)\; K = 298.15\; K[/tex].
[tex]T_2 = \rm 35^{\circ}C = (35 + 273.15)\; K = 308.15\; K[/tex].
Apply Charles's Law to find the new volume of this gas:
[tex]\displaystyle V_2 = V_1\cdot \frac{T_2}{T_1} = \rm 55\;L \times \frac{308.15\; K}{298.15\; K} = 56.8\; L[/tex].
A 250 g sample of water with an initial temperature
of 98.8 Closes 6500 joules of heat. What is the final
temperature of the water?
Answer:
.3044
q = mass x specific heat x (Tfinal-Tionitial)
q = -7500. Substitute and solve for Tfinal
Explanation:
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a propane torch is lit inside a hot air balloon during preflight preparations to inflate the balloon. which condition of the gas remains constant
Answer:
The pressure remains constant
Explanation:
this is an example in charles law where as the temperature increases so does the volume.
Answer:
The correct answer is "Pressure".
Explanation:
As the propane torch is ignited inside the hot air balloon, the volume of the gas increases and the temperature of the gas also increases. This causes the density of the gas to decrease, keeping the pressure constant throughout the balloon, regardless of the small amount of gas lost through the balloon hole.
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An object of mass 10.0 KG and volume 1000 ML and density 10 G/ML sinks in water who’s density is 1.0 G/ML. What is the mass of the water which has been displaced in kilograms
Answer:
1000 grams or 1 kg
Explanation:
All that matters for this question is the volume of the object (1000 mL) and that the density of the object is more than the density of water.
Since the density of water is 1 gm/ mL and 1000 mL have been displaced, the answer is 1000 grams or 1 kg. You can actually calculate this from a formula.
density = mass / volume
density = 1 gram/ml
Volume = 1000 mL
mass = ?
mass = volume * density.
mass = 1000 mL * 1 gram / mL
mass = 1000 grams
Notice how you are focusing on the volume of the object and the mass of the water.
A. Explain, in terms of particles, why NaCl(s) does not conduct electricity.
Answer:
Ionic bonds hold charged particles in solid NaCl together, such that they are unable to move or conduct electricity.
Explanation:
Consider an electric current that flows through a conductor: charge moves in a uniform direction from one end of the conductor towards the other.
Thus, there are two conditions for a substance to conduct electricity:
The substance shall contain charged particles, andThese charged particles shall be free to move across the substance.A conductor of electricity shall meet both requirements.
Now, consider the structure of solid NaCl [tex]\rm NaCl\;(s)[/tex]. NaCl is an ionic compound. It contains an ocean of oppositely charged ions:
Positive [tex]\rm Na^{+}[/tex] ions, andNegative [tex]\rm Cl^{-}[/tex] ions.Ions carry charge. Thus, solid NaCl contains charged particles and satisfies the first condition.
Inside solid NaCl [tex]\rm NaCl\;(s)[/tex], electrostatic attractions ("ionic bonds") between the oppositely charged ions hold these ions in rigid ionic lattices. These ions are unable to move relative to each other. As a result, they cannot flow through the solid to conduct electricity. Under solid state, NaCl is unable to satisfy the second condition.
As a side note, melting NaCl into a liquid breaks the ionic bonds and free the ions from the lattice. Liquid NaCl is a conductor of electricity.
NaCl(s) does not conduct electricity because, in its solid state, the sodium and chloride ions are held in a fixed lattice structure and cannot move freely.
Electrical conductivity in a substance is dependent on the presence of charged particles that can move freely. In the case of sodium chloride (NaCl), which is an ionic compound, the structure is composed of sodium cations (Na^+) and chloride anions (Cl^-) arranged in a crystalline lattice. When NaCl is in the solid state, the ions are locked into place by strong electrostatic forces of attraction between the oppositely charged ions. These forces hold the ions in a rigid, three-dimensional array, preventing them from moving about freely.
For a material to conduct electricity, it must have mobile charge carriers. In metals, these charge carriers are delocalized electrons that can move throughout the metal. In ionic solutions or molten ionic compounds, the ions themselves are the charge carriers, and they can move when an electric field is applied. However, in solid NaCl, the ions are immobile due to the lattice structure, and thus, there are no free charge carriers to transport electric charge. As a result, solid NaCl does not conduct electricity.
When NaCl is dissolved in water or melted into a liquid, the ions are no longer fixed in place and can move freely. In this state, NaCl does conduct electricity because the ions can act as charge carriers, moving towards the electrodes of opposite charge under an applied electric field
According to Le Chatelier’s principle, what happens when the concentration of reactants is doubled in a chemical reaction that was in equilibrium?
The equilibrium shifts to the right to favor the formation of products.
The equilibrium shifts to the left to favor the formation of reactants.
The equilibrium is unaffected by the increase in concentration.
The equilibrium is lost because the concentrations have been disturbed.
Answer:
will shift to right
Explanation:
this will result in the formation of more product
According to Le Chatelier’s principle, when the concentration of reactants is doubled the equilibrium shifts to the right to favour the formation of products and the correct option is option 1.
What is Chemical Equilibrium?Chemical equilibrium refers to the state of a system in which the concentration of the reactant and the concentration of the products do not change with time, and the system does not display any further change in properties.
It is the state of a reversible reaction where the rate of the forward reaction equals the rate of the reverse reaction. While a reaction is in equilibrium the concentration of the reactants and products are constant.
Therefore, According to Le Chatelier’s principle, when the concentration of reactants is doubled the equilibrium shifts to the right to favour the formation of products and the correct option is option 1.
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If 10.0 mL of 0.350 M aqueous NaNO3 is mixed with 50.0 mL of 0.170 M aqueous KNO3, what is the molarity of nitrate ion?
A) 0.185 M
B) 0.200 M
C) 0.260 M
D) 0.520 M
Answer:
0.200 mol/L
Explanation:
1. Moles of nitrate in first solution
Moles = volume × concentration
n = 0.0100 L × 0.350 mol/L =0.003 500 mol
2. Moles of nitrate in second solution
n = 0.0500 L × 0.170 mol/L = 0.008 500 mol
3. Total moles of nitrate
n = 0.003 500 + 0.008 500 = 0.012 000 mol
4. Total volume of solution
V = 10.0 + 50.0 = 60.0 mL = 0.0600 L
5. New concentration of nitrate
c = moles/litres
c = 0.012 000 mol/0.0600 L = 0.200 mol/L
The molar concentration of nitrate ion is 0.200 mol/L.
HELP!!!!!!!!!!!!!!!!
Hyy mate......
Here is your answer ......
➡️⏺️Oxygen⏺️⬅️1️⃣Name: Oxygen
2️⃣State : non-metal
3️⃣Family:Oxide
4️⃣Protons: 8
Electron:8
Neutron: 8
Hope it will help you...
Thanks for asking....
Which of the following best describes a chain reaction? Select one: a. Neutrons from splitting atoms continue to split other atoms, releasing more neutrons. b. Chemicals released from splitting atoms cause other atoms to split. c. Splitting atoms bump into neighboring atoms, causing them to split. d. A splitting atom causes the atom directly beside it to also split.
Chain reaction is best described as neutrons from splitting atoms continue to split other atoms, releasing more neutrons.
What is Neutron?This is referred to as a subatomic particle which has a neutral charge and is produced in preceding fusion of the chain reaction.
The neutron produced initiates the splitting of the atoms which was why option A was chosen in this regard.
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A chain reaction, in the context of nuclear physics, is when neutrons released from a fission event cause other atoms to undergo fission. An example is the fission process of uranium-235, which releases additional neutrons that can trigger further fission, thus leading to an exponentially increasing reaction.
Explanation:The best description for a chain reaction among the options presented is: 'Neutrons from splitting atoms continue to split other atoms, releasing more neutrons' (Option A). This process refers to a series of nuclear fissions (splitting of a nucleus), where the released neutrons from one fission event cause further fissions. As an example, when undergoing fission, uranium-235 (U-235) produces two medium-sized nuclei and releases two or three neutrons. These neutrons can then cause the fission of other U-235 atoms, which in turn provide more neutrons that can cause more fissions, leading to a nuclear chain reaction.
However, it should be noted that a chain reaction depends on several factors, including how many neutrons are produced in an average fission and how easy it is to induce a particular type of nuclear fission.
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What is the formula unit for a compound made from Pb4+ and oxygen?
Answer : The formula unit of compound will be, [tex]PbO_2[/tex]
Explanation :
As we know that one atom of oxygen contains (2-) charge and one atom of lead contains (4+) charge. So, to balance the of charges of lead, the 2 oxygen atoms combine with the 1 lead atom. Thus, the compound formed will be, [tex]PbO_2[/tex].
That means, when [tex]Pb^{4+}[/tex] combine with oxygen that is, [tex]O^{2-}[/tex], it gives [tex]PbO_2[/tex] by the criss-cross method.
Criss cross method : It is a method of determining the chemical formula.
The formula unit is a shown below.
Answer:
Pb02
Explanation:
guy above was correct i just took my test
what does it mean for something to be dissolved in water
A- it is submerged in water molecules
B-it is stirred in the water molecules
C- it is surrounded by water molecules
D-it has water molecules added to it
Dissolved in water, has been defined as the solute surrounded by the water molecules. Thus, option C is correct.
Dissolution has been defined as the process of the formation of solution with the addition of solute molecules in the solvent molecules.
What does dissolve in water means?The dissolution has been achieved with the addition of the solute molecules in the water. The water molecules tend to act the absorbent and surrounds around the solute particles.
There has been a formation of micelle like structure that has been mediated in the dissolution of the compound in water.
Thus, dissolved in water has been defined as the solute surrounded by the water molecules. Thus, option C is correct.
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Answer:
It is surrounded by water molecules.
Explanation:
Js did it ^v^
What will most likely happen when two bromine atoms bond together?
They would form a single covalent bond and become Br2.
They would become a covalent bond and become Br2.
When comparing two solutions with the same volume, you may say that one is dilute and the other is concentrated. What does this mean?
A.
The dilute solution contains more solute than the concentrated solution.
B.
The dilute solution contains less solute than the concentrated solution.
C.
The two solutions are the same.
D.
The concentrated solution contains less solute than the dilute solution.
Answer:
B. The dilute solution contains less solute than the concentrated solution.
Explanation:
A diluted solution is a solution that has less solute (what is being dissolved) dissolved in the solvent (what is dissolving). A concentrated solution is the opposite, it has more solute than dissolved by the solvent.
A simple example is when you make iced tea (with powder). If you want a strong taste, you add more iced tea powder (solute) to the water (solvent) so it is more concentrated. If you want less, you add more water to dilute it.
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A 50.0-mL sample of gas is cooled from 119ºC to 80.0ºC. If the pressure remains constant, what is the final volume of the gas?
Answer:
45.03 mL.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
If n and P are constant, and have different values of T and V:(V₁T₂) = (V₂T₁).
V₁ = 50.0 mL, T₁ = 119ºC + 273 = 392 K,
V₂ = ??? mL, T₂ = 80ºC + 273 = 353 K.
∴ V₂ = (V₁T₂)/(T₁) = (50.0 mL)(353 K)/(392 K) = 45.03 mL.
To find the final volume of a gas sample when cooled from 119ºC to 80.0ºC at constant pressure, we use Charles's Law, resulting in an approximate final volume of 45.0 mL.
To solve this, we use Charles's Law, which states that for a given mass of gas at constant pressure, the volume is directly proportional to its temperature in Kelvin.
First, convert the temperatures from Celsius to Kelvin:
Final temperature (T₂): 80.0ºC + 273.15 = 353.15 K
Using Charles's Law (V₁/T₁ = V₂/T₂):
Initial volume (V₁) = 50.0 mL
392.15 K / 50.0 mL = 353.15 K / V₂
Rearrange to solve for the final volume (V₂):
V₂ = (50.0 mL × 353.15 K) / 392.15 K
V₂ ≈ 45.0 mL
So, the final volume of the gas is approximately 45.0 mL.