Final answer:
To find the chlorine concentration in the solution, the moles of chlorine from CaCl₂ and MgCl₂ are calculated and summed. The total chlorine mass is then determined and divided by the solution volume in liters, resulting in a concentration of 18.45 g/L.
Explanation:
To calculate the concentration of chlorine in the solution prepared by mixing 2g of CaCl₂, 2g of MgCl₂, and 3g of MnO₂ in a total volume of 150 mL, first, we need to determine the amount of chlorine present in each compound. Calcium chloride (CaCl₂) and magnesium chloride (MgCl₂) each have two moles of chlorine per mole of compound, while manganese dioxide (MnO₂) has no chlorine.
Molar mass of CaCl₂ = 110.98 g/mol
Molar mass of MgCl₂ = 95.21 g/mol
Amount of chlorine from CaCl₂:
• (2 g CaCl₂) / (110.98 g/mol) = 0.01802 mol CaCl₂ × 2 mol Cl⁻/mol = 0.03604 mol Cl⁻
Amount of chlorine from MgCl₂:
• (2 g MgCl₂) / (95.21 g/mol) = 0.02101 mol MgCl₂ × 2 mol Cl⁻/mol = 0.04202 mol Cl⁻
Total moles of Cl⁻ = 0.03604 mol + 0.04202 mol = 0.07806 mol
Finally, to find the concentration of chlorine in g/L:
• (0.07806 mol Cl⁻) × (35.45 g/mol) = 2.767 g of Cl⁻
• Since the total volume is 150 mL, or 0.15 L, the concentration is (2.767 g / 0.15 L) = 18.45 g/L.
predict the products of the decomposition of lithium nitride, Li3N
A) Li3 + N
B) Li3 + N2
C) Li + N
D) Li + N2
D) Li + N2
Explanation;A decomposition reaction is a type of chemical reaction in which one reactant yields two or more products. Lithium nitride undergoes thermal decomposition to produce Lithium and nitrogen gas. This reaction takes place at a temperature of 300° to 500°C in a vacuum.The equation for the reaction is;2Li3N(s) → 6Li(s) + N2(g)
17kg of aluminium was produced from 51kg of aluminium oxide (Al2O3) by electrolysis.What was the percentage yield?
Consider this reaction : 2Al2O3 → 4Al + 3O2
The number of moles of Al2O3 can be determined from its mass →
Number of moles of AL2O3 = mass/molar mass
=51/(27x2+16x3)
= 0.5 mol
Now, calculate aluminium's number of moles from the mole ratio →
Mole ratio 4(Al) : 2(Al2O3)
Number of moles of Al = (4/2) x0.5mol = 1 mol
Mass of Al = number of moles x molar mass
= 1x27
= 27kg (theoretical yield)
Given, actual yield = 17kg
Therefore, percentage yield = (actual yield / theoretical yield ) x 100
= (17/27)x100
= 62.96%
please help!! i need the answer ASAP!
Answer:
23.34 %.
Explanation:
The percentage of water must be calculated as a mass percent.We need to find the mass of water, and the total mass in one mole of the compound. For that we need to use the atomic masses of each element and take in consideration the number of atoms of each element in the formula unit.Atomic masses of the elements:Cd: 112.411 g/mol, N: 14.0067 g/mol, O: 15.999 g/mol, and H: 1.008 g/mol.
Mass of the formula unit:Cd(NO₃)₂•4H₂O
mass of the formula unit = (At. mass of Cd) + 2(At. mass of N) + 10(At. mass of O) + 8(At. mass of H) = (112.411 g/mol) + 2(14.0067 g/mol) + 10(15.999 g/mol) + 8(1.008 g/mol) = 308.5 g/mol.
Mass of water in the formula unit:mass of water = (4 × 2 × 1.008 g/mol) + (4 × 15.999 g/mol) = 72.0 g/mol.
So, the percent of water in the compound = [mass of water / mass of the formula unit] × 100 = [(72.0 g/mol)/(308.5 g/mol)] × 100 = 23.34 %What do scientists do? O A. They use their knowledge to make public policy O B. They make sure all facts fit scientific theories. O C. They make ethical decisions for the government O D. They learn about the world through observation.
Considering there are different fields of science and many career involving the matter, I'd say that option D. They learn about the world through observation. makes the most sense in this scenario.
I hope this helps! :)
I think the answer to this is D, I am sorry if I’m wrong
A saturated solution can become supersaturated under which of the following conditions
the answer is d. when more solute is added
Condensation is the change from _____.
condensation is the change from a gas to a liquid.
for example, when a humid room is cooling, the water vapour particles lose kinetic energy, move closer together and become liquid water.
hope this helps! ~ •lipika•
calorimeter containing 1000 grans of water the initial temperature of water is 24.85 degrees . the heat of water is 4.184 j/g degrees the heat capacity of the calorimeter is 695 j/ c after the reaction the final temperature of the water is 35.65
calculate the change of temperature
10.80 ° C
Explanation;From the information given;
Initial temperature of water = 24.85°C
Final temperature of water = 35.65°C
Mass of water = 1000 g
The specific heat of water ,c = 4.184 J/g °C.
The heat capacity of the calorimeter = 695 J/ °C
Change in temperature ΔT = 35.65°C - 24.85°C
= 10.80°C
Which process describes the movement of molecules from areas of high concentration to areas of low concentration? osmosis solution diffusion homeostasis
It is diffusion.
In a plant it is osmosis but thats not in an area
Solution has honestly got nothing to do with it.
The last one has to do with equilibrium
SO ITS DIFFUSION
:)
Answer: diffusion
Explanation:
Osmosis is defined as the process in which molecules of a solvent tend to move through a semipermeable membrane from a region of low concentration solution to a region of more concentrated solution in a membrane.
Solution is the homogeneous mixture of solute and solvent where solute is the component which is present in smaller proportion and solvent is the component which is present in larger proportion.
Diffusion is defined as the random motion of molecules from areas of higher concentration to lower concentration.
Homeostasis is the active regulation and maintenance of a stable internal physiological state in the face of a changing external environment.
Identify which property changes as temperature increases to increase the reaction rate.
A) Increasing the temperature decreases the molecular motion.
B) Increasing the temperature reduces the collision frequency.
C) Increasing the temperature divides the solubility of the solute.
D) Increasing the temperature increases the energy of the molecules.
Answer:D
Explanation:according to Kinetic molecular theory the kinetic energy is directly proportional to the absolute temperature.
It means that when we increase the temprature the motion of molecules increase,as a result the rate of reaction is also increased.
Which means that the effective collision is also increased.
Answer:
D) Increasing the temperature increases the energy of the molecules.
Explanation:
Increasing the temperature increases the energy of the molecules.
As temperature increases the energy of the molecules increases and the energy of the collision making it more likely for a reaction to occur.
Soil erosion is a secondary environmental problem because it only degrades the land and does not affect water or air quality.
True or false ?
The correct answer is - False.
The soil erosion is a primary environment problem. It latter has effects that fall into the category of secondary environmental issues. The erosion of the soil is a very serious environmental issue, as it is the prime natural resources that enables the growth of plants, thus food for the living organisms, including the humans. Also, with high rates of erosion, the process of desertification significantly increases, as the soil is stripped of its top layers. The sediments that have been stripped of the soil can cause pollution of the air, though the stronger winds and storms that carry them, or with sediments getting to the water bodies and making them all murky, muddy.
A 3.87mg sample of an organic compound gave 5.80mg CO² and 1.58mg h²O on combustion. Deduce the empirical formula of the compound.
Answer:
C₃H₄.
Explanation:
The organic compound gives CO₂ and H₂O.The no. of moles of CO₂ produced = mass/molar mass = 5.80 mg/44.0 g/mol = 0.1318 mmol.
Which is corresponding to 0.1318 mmol of C.
The no. of moles of H₂O produced = mass/molar mass = 1.58 mg/18.0 g/mol = 0.08778 mmol.
which corresponds to (0.08778 x 2) = 0.1756 mmoles of H.
The ratio of the number of moles of hydrogen to carbon in the composition of the compound will be 0.1756/0.1318 = 1.332 = 1 + 1/3 = 4/3.
Therefore, the empirical formula of the compound under consideration is C₃H₄.A neutron has a mass A. that is less than the mass of an electron. B. that is about equal to the mass of an electron. C. that is about equal to the mass of a proton. D. that is less than the mass of a proton.
A neutron has a mass that is about equal to the mass of a proton, approximately 1.0087 amu, while an electron has a much smaller mass of about 0.00055 amu.
Explanation:A neutron has a mass that is about equal to the mass of a proton. While the exact values can vary slightly due to isotopic differences, generally, a neutron is indeed slightly heavier than a proton, with a mass of approximately 1.0087 atomic mass units (amu), and a proton has a mass of approximately 1.0073 amu. In contrast, an electron is a much lighter particle with a mass of about 0.00055 amu. This significant difference in mass means that it would take about 1,836 electrons to equal the mass of one proton or neutron. The correct answer, therefore, is option C, that a neutron's mass is about equal to the mass of a proton.
Final answer:
A neutron has a mass that is C. about equal to the mass of a proton, not the mass of an electron. A neutron is slightly heavier than a proton and much heavier than an electron, with a weight of approximately 1.0087 amu. The correct answer is option C.
Explanation:
The mass of a neutron is about equal to the mass of a proton, which makes option C the correct answer. Specifically, a neutron has a mass of 1.0087 atomic mass units (amu) whereas a proton has a mass of 1.0073 amu. In comparison, an electron is a much lighter particle with a mass of approximately 0.00055 amu. Thus, it would take about 1800 electrons to equal the mass of one proton.
Additionally, in terms of charge, the neutron is electrically neutral with zero charge, the proton has a charge of 1+, and the electron has a charge of 1-. These subatomic particles are fundamental to the structure of atoms, with protons and neutrons making up the nucleus and electrons orbiting around it.
science is a way of learning about the natural world that is based on what?
Learning how our body works and other things in the world work.
What happens to the mass of a substance during a physical change?
it stays exactly the same
Answer:
During a physical change, items may change, but the mass is the same.
explain how the water in an iceberg may fall as rain over a city
They go through something called the Water Cycle,
First, they will go through the Evaporation Step where the water will evaporate into a gas and raise into the clouds.
Then, they will go through the Condensation Step where the Vapor that went into the clouds will cool down and turn back into liquid water.
Next, they will go through the Precipitation Step where the Water (which can be Rain Hail snow or Sleet) will fall out of the clouds.
Finally, all of the fallen water will collect into Lakes, Oceans, Rivers, Streams and sometimes water under the ground.
if the water is still turning into vapor from condensation it will turn to rain eventually but it cant be evaporated if heat cant get the water think as a air bubble the air remains until it pops or if its frozen in ice it will remain till the water melts and exposes the air to the world again.
Describe the atomic theory of atoms
Answer: Below
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Explanation:
The atomic theory is that all matter is made up of tiny units or particles called atoms. This theory describes the characteristics, structure and behavior of atoms as well as the components that make up atoms. Furthermore, the theory states that all elements are made up of identical atoms.
The atomic theory is a theory in the study of chemistry that states atoms are the building blocks of matter. Atoms contain protons, neutrons and electrons. Protons, which have a positive charge, and neutrons are found in the nucleus of the atom. Electrons, which have a negative charge, orbit the nucleus.
According to the atomic theory, all elements contain atoms. The difference is the number of protons, electrons and neutrons in that atom. For instance, hydrogen contains one proton and one electron but no neutrons. Oxygen, on the other hand contains eight protons, electrons and neutrons. The difference in protons, electrons and neutrons determines the stability and the other properties of any particular element. These elements are grouped according to their atomic masses, which depend on the number of protons and neutrons in each of the atoms. Because oxygen has more protons and neutrons than hydrogen, it has a higher atomic mass.
Two examples of energy transformations are shown.
The energy transformations are similar because they both involve transformations
that begin with chemical energy.
begin with electrical energy.
result in radiant energy.
result in mechanical energy.
The energy transformations are similar because they result into radiant energy.
As for the lamp, Electrical energy is transformed into light when the filament
or mercury vapor glows on passage of current.
The fire- chemical energy is turned to light energy during the combustion of carbon. Both products comprise of ultraviolet radiation which is a form of radiant energy.
Answer:
the answer is C
Explanation:
Sort the properties of metalloids into the correct categories
(See image)
Lustrous
Solid at room temerature
In-Between Characteristics:Semiconducting
Amphoteric
Nonmetallic:Brittle
NEED HELP ASAP !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Temperature...
A.
is an indicator of the amount of thermal energy that an object possesses.
B.
only pertains to heat transfer, not thermal energy.
C.
is exactly the same as thermal energy.
D.
is not related to thermal energy.
1. An ice cube that is dropped into a glass of water melts because
A.
the ice is denser than the water.
B.
the water is denser than the ice.
C.
the water is liquid, and the ice is solid.
D.
heat energy moves from the water to the ice.
2.What type of energy transformation occurs when a light bulb is turned on?
A.
Mechanical energy is converted into kinetic energy.
B.
Electrical energy is transformed into heat and mechanical energy.
C.
Electrical energy is transformed into heat and light energy.
D.
Potential energy is converted into kinetic energy.
Temperature... - A
1. An ice cube that is dropped into a glass of water melts because - D
2 What type of energy transformation occurs when a light bulb is turned on -
C
➷ Temperature is an indicator of the amount of thermal energy that an object possesses [option A]
An ice cube that is dropped into a glass of water melts because heat energy moves from the water to the ice [option D]
Electrical energy is transformed into heat and light energy [option C]
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Which of the following statements is true? Running an electric current through a magnet can create a magnetic field. Electric engines change electricity into magnetism. The strength of a magnetic field increases with distance. Electrons are found in the nucleus of an atom.
Electric engines change electricity into magnetism
Answer:
A-Running an electric current through a magnet can create a magnetic field.
Explanation:
The answer is A-Running an electric current through a magnet can create a magnetic field. I chose B and got it wrong on my test. The correct one is A
Please do this entire worksheet for me. I will award 59 points!!
where is the work sheet?
Plz post the worksheet so that I can do it for you. Please don't report this, i am trying to help!
what is located within 10 to 15 km above the earth's surface?
It extends 10 to 15 kilometers (6 to 10 miles) above the earth's surface depending on latitude and time of the year. The troposphere contains most of the atmosphere's water vapor.
The ozone layer is located 10-15 km above the earth's surface.
Describe the ozone layer.The ozone layer, also known as the ozonosphere, is an area of the upper atmosphere that is located between 15 and 35 km (9 and 22 miles) above the surface of the Earth containing a high concentration of ozone molecules (O₃). A fraction of the solar radiation is blocked from reaching the planet's surface by the ozone layer in the stratosphere. It mostly absorbs UVB radiation. Numerous negative consequences, including skin cancer, cataracts, damage to some crops, and harm to marine life have all been associated with UVB.Learn more about the ozone layer here:
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The ideal gas law measures volume in___.
For the Ideal Gas Law, pressure is measured in atmospheres, volume is measured in liters, and temperature is measured in Kelvin. Obviously, moles is measured in moles.
The ideal gas law measures volume in liters (L). The law also explores the relationship between pressure, volume, number of moles of the gas, and temperature. Hence, we can calculate the volume if we know the other three factors.
Explanation:The ideal gas law, usually written as PV = nRT, where 'P' represents pressure, 'V' volume, 'n' the number of moles of the gas, 'R' the ideal gas constant, and 'T' the temperature, measures volume in liters (L). According to Avogadro's Law, the volume of a gas at a constant temperature and pressure is proportional to the number of gas molecules. So in the ideal gas law, if we know the pressure, temperature, and the number of moles of a gas, we can calculate its volume.
For example, if we have a vessel with a known pressure and temperature, and we insert a known quantity of gas (in moles), we can use the ideal gas law to calculate the volume that the gas will occupy under those conditions.
Remember, this is for ideal gases. Actual gases may deviate from this law under certain conditions.
Learn more about Ideal Gas Law here:https://brainly.com/question/30458409
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Why are fungi more closely related to animals than they are to plants?
A. animals and fungi are both autotrophs, while plants are heterotrophs
B. animals and fungi are both heterotrophs, while fungi are autotrophs
C. fungi and animals are both heterotrophs, while plants are autotrophs
D. fungi and plants are both autotrophs, while animals are heterotrophs
the answer maybe B or A
Final answer:
Fungi are more closely related to animals than plants because they are both heterotrophs, while plants are autotrophs. Fungi share characteristics such as being heterotrophic, having chitin in their cell walls, and storing carbohydrates as glycogen with animals.
Explanation:
Fungi are more closely related to animals than they are to plants because fungi and animals are both heterotrophs, while plants are autotrophs. Fungi obtain their energy by consuming complex organic compounds from outside sources, similar to animals. Fungi also share other characteristics with animals, such as having chitin in their cell walls and storing carbohydrates as glycogen.
Which of the following processes are endothermic? ice forming on a pond iodine crystals subliming water boiling gasoline burning
MULTIPLE ANSWERS
The boiling of water and sublimation of iodine crystals are endothermic processes.
Answer: Option B & C
Explanation:
Endothermic process are the classifications of chemical reactions where the heat is absorbed by the system from the surroundings. As the matters can exists in three phases like solid, liquid and gases.
The endothermic process occurs by absorption of heat energy by the system. So according to the given options, the boiling of water and iodine crystal sublimation follows endothermic process. In the boiling of water occurs when the water molecules absorb heat from the surrounding and convert to gas phase.
Similarly, the sublimation of iodine crystals also require heat energy from the surrounding to break the bonds of the iodine crystals to sublimate to gas phase. Thus the boiling of water and sublimation of iodine crystals are the examples of endothermic processes.
Which substances dissolve in water
Because water molecules are polar, water can dissolve many other polar substances. Water can also dissolve ionic compounds such as table salt.
Soluble substances anything power like that can be broken down by water like kool aid powder sugar salt. Please give me brainliest answer.
:) Hope this helped have a good day!
Is it possible to change the strength of an acid? Explain how you would do this.
Answer:
Reducing or increasing the amount of H+ ions / hydronium (H3O+) ions
Explanation:
To reduce the pH (reducing the strength of the acid) can be done by adding a base (including a conjugate base such as bicarbonate ion) which will absorb the H+ ions either through adsorption or reaction.
Adding more H+ decreases the pH of the acid making it stronger. This can be done by adding HCL that will dissociate and increase the H+ ions.
Final answer:
The strength of an acid can be modified by altering its molecular structure or by changing the acid's concentration in a solution. Acid strength is directly related to the ability of the acid to donate hydrogen ions, which is influenced by the electronegativity of the atoms involved in the acid molecule.
Explanation:
It is indeed possible to change the strength of an acid. The strength of an acid depends on its ability to donate hydrogen ions (H+) in solution. Strong acids are characterized by 100% ionization in solution, while weak acids only partially ionize. The molecular structure of an acid, especially the electronegativity of its central atom, plays a significant role in acid strength. By modifying the molecular structure, such as by substituting atoms or groups with more electronegative ones, the acid strength can be changed.
For instance, adding more electronegative elements to the structure can increase the acid's ability to donate H+. Moreover, using the periodic table as a guide, we can predict the acid strength: as you move from left to right and down the periodic table, acid strength increases due to increasing electronegativity. One could also alter acid concentration or mix it with other substances (like bases) to change the pH, and thus, the perceived strength of the acid in a given solution.
what is a subshell? explain why is it important.
a subshell is a subdivision of electron shells seperated by electron orbitals
What is the oxidation number of nitrogen in the nitrate ion NO31−?
+6
+5
+3
+2
In No3-1 the oxidation number of oxygen is -5 so oxidation number of N would be +5
Oxidation state on [tex]\text{N}[/tex] as in the nitrate ion [tex]{\text{NO}_3}^{-}[/tex]: +5.
ExplanationThe sum of oxidation states on all atoms in an ion should be the same as the charge of the ion.
The oxidation state of nitrogen N tends to vary. However, the oxidation state of oxygen O is -2 in most cases, with the following exceptions:
Oxidation state of O in [tex]\text{O}_2[/tex]: 0.Oxidation state of O in [tex]\text{H}_2\text{O}_2[/tex] and other peroxides: -1.The oxidation state of O will be positive when it is bonded to fluorine F.To find the oxidation state on N, consider the atoms in a nitrate ion:
There are three O atoms in each nitrate ion, as seen in the subscript "3".There's only one N atom in each nitrate ion.The oxidation state of each O atom is expected to be -2. There are three O atoms in each nitrate ion. The oxidation state of the three atoms will add up to [tex]3 \times (-2) = -6[/tex].
The oxidation state of the N atom needs to be found. Charge on the nitrate ion is -1. Thus
[tex]\begin{array}{ccc}\text{oxidation state on all atoms in the ion}&= &\text{charge of the ion}\\(\text{oxidation state on N}) + 3 \times (-2) &=& -1\end{array}[/tex]
[tex](\text{oxidation state on N}) = -1 - 3\times(-2) = -1 - (-6) = -1 + 6 = +5[/tex].
Therefore, the oxidation state of the nitrogen N atom in the nitrate ion [tex]{\text{NO}_3}^{-}[/tex] is +5.
Describe two parts of mitosis that are similar to meiosis
Phases of meiosis II.
Prophase II: Starting cells are the haploid cells made in meiosis I. Chromosomes condense.
Metaphase II: Chromosomes line up at the metaphase plate.
Anaphase II: Sister chromatids separate to opposite ends of the cell.