Answer:
2.00 mol/dm³Explanation:
Potassium trioxonitrate(V) is KNO₃.
1. Find the molar mass of the solute
The molar mass of KNO₃ is 39.098g/mol + 14.007g/mol + 3×15.999g/mol = 101.102g/mol.
2. Convert the mass of solute, 20.02g, into number of moles
number of moles = mass in grams / molar mass number of moles = 20.2g / 101.102g/mol = 0.1998mol3. Assume that the volume of the solution is equal to the volume of water
This is a rough approximation, but it is necessary since you do not have the density of the solution:
density = mass / volume1.00 g/cm³ = 100g / volumevolume = 100g × 1.00g/cm³ = 100cm³Convert 100cm³ to dm³:
100cm³ × 1dm³ / 1,000cm³ = 0.1 dm³4. Calculate the solubility is mol/dm³
0.1998 mol / 0.1dm³ = 1.998mol/dm³ ≈ 2.00mol/dm³It is rounded to three significant digits to match the choices.
Final answer:
The solubility of potassium trioxonitrate(V) in water at room temperature is 2 mol/dm³, calculated by dividing the moles of the dissolved substance by the volume of the solvent in liters.
Explanation:
To calculate the solubility of potassium trioxonitrate(V), which is potassium nitrate (KNO3), we first need to find the molar mass of KNO3 to convert the given mass to moles. Potassium (K) has an atomic mass of approximately 39 g/mol, nitrogen (N) has an atomic mass of approximately 14 g/mol, and oxygen (O) has an atomic mass of approximately 16 g/mol. Therefore, the molar mass of KNO3 is 39 + 14 + (3 × 16) = 101 g/mol. Now, we take the mass of KNO3, 20.2 g, and divide it by its molar mass to find the number of moles:
Number of moles of KNO3 = 20.2 g / 101 g/mol = 0.2 mol
Since the solvent water has a mass of 100 g, and knowing that the density of water is approximately 1 g/cm³, we can assume that the volume of 100 g of water is approximately 100 mL or 0.1 L. Thus, the solubility of KNO3 in mol/dm³ can be calculated as:
Solubility = Number of moles / Volume in L = 0.2 mol / 0.1 L = 2 mol/dm³
When matter and energy change forms within a closed system, A. the total amount of matter changes, but the total amount of energy does not. B. the total amount of energy changes, but the total amount of matter does not. C. the total amount of both matter and energy changes. D. the total amount of both matter and energy does not change.
Answer:
Option D. The total amount of both matter and energy does not change.
Explanation:
From Law of conservation of energy and Einstein's mass-energy relation, we know that, energy neither is formed not is destroyed. It converts from one form to another. Einstein's mass-energy relation: E = mc². It means, Matter is a form of energy i.e. matter holds energy equivalent to product of its mass and square of speed of light. Matter and energy can change forms but the total amount does not change in a closed system. Thus, correct option is D.
Answer:
D. energy cannot be created or destroyed, therefor, the total amount of matter and energy does not change.
Explanation:
study island
Why are strong acids also strong electrolytes? Also, is every strong electrolyte a strong acid?
Answer:
Explanation:
An acid is a substance that interacts with water to produce excess hydroxonium ions in an aqueous solution.
An electrolyte is a compound which breaks up into ions when dissolved in water or when in molten form.
A strong acid is one that ionizes almost completely ion aqueous solution.
To make a strong electrolyte, there must be presence of ions from compounds that ionizes completely in aqueous solution or in molten form to give free mobile ions. This is why strong acids are very strong electrolytes too.
2. Other examples of strong electrolytes are mineral acids, caustic alkalis and salts because they also ionize completely in aqueous solutions. Any compoud that ionizes completely in aqueous solution will produce a strong electrolyte.
Strong acids are considered strong electrolytes because they completely ionize in solution, producing a high concentration of ions which makes them good conductors of electricity. However, not all strong electrolytes are strong acids; other substances like strong bases and salts can also be strong electrolytes.
Explanation:Strong acids, such as hydrochloric acid (HCl), are also strong electrolytes because they ionize completely in aqueous solution, meaning they release all their hydrogen ions (H*). This leads to a high concentration of ions, making them excellent conductors of electricity, which is the characteristic of a strong electrolyte. These acids are more likely to donate H* and react with other substances in solution.
However, not every strong electrolyte is a strong acid. A strong electrolyte only indicates that a substance can fully dissociate into ions in solution, enhancing its ability to conduct electricity. Other substances, like strong bases and salts, can also be strong electrolytes. For example, sodium hydroxide (NaOH) is a strong base and a strong electrolyte because it readily dissociates into Na+ and OH- ions in solution.
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solar panels use which of the following energy sources to generate electricity?
Sunlight/light from the sun
What is the best way to describe how mutations relate to the concept of survival of the fittest? Choose the best answer from the choices below.
A. Only those mutations that are helpful will be passed-on.
B. A mutation that allows organisms to survive is more likely to be passed on.
C. Only those mutations that are harmful will be passed-on.
D. Mutations do not relate to survival of the fittest.
Answer:
B
Explanation:
Mutations that increase an organism's ability to survive and reproduce in its environment are more likely to be passed on to future generations. This core principle is known as survival of the fittest.
Explanation:The concept of survival of the fittest is closely related to the idea of mutations. Mutations are changes in an organism's DNA that can lead to new traits. The best way to describe how mutations relate to survival of the fittest is to say that a mutation that allows an organism to survive and reproduce more successfully in its environment is more likely to be passed on to future generations.
Thus, option B is the correct answer: 'A mutation that allows organisms to survive is more likely to be passed on'. Not all mutations are beneficial, some can be harmful or neutral, but only those mutations that increase an organism's fitness — its ability to survive and reproduce — are likely to be passed on.
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Definition: For all real numbers a, b, and c: if a=b, then a + c = b + c. This is the ____ ____ of Equality.
Answer: Addition Property of Equality
Explanation:
The addition property of equality says that if we add same value or quantity on both sides of an equation, the values on both the sides remain equal. Consider an equality a = b. Addition property of equality is a + x = b + x. Add the same number to both the sides of an equation.
1 Mr. Chavez paid $14.32 total for 8 protein bars.
If each protein bar cost the same amount, how
much did one protein bar cost?
A $1.69 C $1.79
B $1.82 D $1.59
Answer:
Option C. $1.79
Explanation:
From the question, were told that the total cost of 8 protein bar is $14.32.
Therefore, the cost of 1 protein bar will be = $14.32/8 = $1.79
What are five main characteristics of a mineral
Explanation:
Minerals are naturalMinerals should be found in nature. Elements made laboratories are not actual minerals like masquerading as rubies or sapphires. All naturally available crystals are not minerals like opal and amber.
Minerals are inorganicMinerals are not under any class of organic compounds. Almost all known minerals come from inorganic processes. Some minerals originate from organic processes like pearls.
Minerals are solidsMinerals exist only as solids. Solids have a defined volume and shape, and they cannot be compressed any further. Minerals are rigid.
Definite chemical compositionEach mineral has a unique combination of atoms that cannot be found in other minerals. The strength of mineral can be defined by the type of bond a mineral has. Some minerals, like gold and diamond, have only one element in it.
Crystalline structureMinerals form crystals that have repeated arrangements of ions. Minerals have different shapes depending on the size of the ion. Crystals usually take six types of shapes.
what is the amount of heat,in joules, required to increase the temperature of a 49.5-gram sample of wanted from 22c to 66c
Answer :
the amount of heat,in joules, required to increase the temperature of a 49.5-gram sample of wanted from 22°c to 66°c is 9.104 Joules.
Explanation:
The answer can be calculated using the formula
Q = mCрΔT
where
Q is the amount of heat required in joules to raise the temperature.
m is the mass of the sample in Kg.
Cp is the specific heat of the sample in J/Kg°C.
ΔT is the change in temperature required.
Here, m = 49.5-gram = 0.0495 kg
Cp = 4.18 J/Kg°C (for water)
T₁ = 22°C ; T₂ = 66°C
ΔT = 66 - 22 = 44
Substituting values in Q = mCрΔT
Q = (0.0495)(4.18)(44)
Q = 9.104 J
which element has a crystalline lattice through which electrons flow freely
Final answer:
Metals have a crystalline lattice that allows free movement of delocalized electrons, making them conductive.
Explanation:
The element that has a crystalline lattice through which electrons flow freely is a metal. In a metallic crystal, metal cations are surrounded by a “sea” of mobile valence electrons, also known as delocalized electrons. These electrons can move through the entire crystal, conducting electricity effectively. This is because the metal ions (often visualized as positive ions due to their loss of valence electrons) are arranged in a lattice structure with enough space for the electrons to move. The free electrons are not tied to any single atom, which allows them to move freely among the atoms when an electrical field is applied. This property is what makes metals good conductors of electricity as opposed to ionic, covalent network, and molecular crystals, which have different electrical properties.
3. Potassium chlorate, KC103, decomposes when heated to produce potassium
chloride and oxygen gas.
If 6.50 grams of KClO3 were heated in a test tube, how many grams of oxygen
gas should be given off?
Answer: oxygen=2.547g
Explanation:
Based on the question,it was observed that the reaction is reversible
2 moles of KClO3 gives 2 moles of KCl and three moles of O2
Molar mass for KClO3 is 245 g/mol
Molar mass for O2 is 96 g/mol
We are to find the mass of O2 and we Are given the mass KCLO3 is 6.50g
245g of KClO3 gives 96g of O2
6.50g of KClO3 gives xg of O2
Cross multiply
245x=624
X=624/245
X=2.547g
Therefore the gram of oxygen is 2.547g
When 6.50 grams of potassium chlorate (KClO3) are heated, approximately 2.54 grams of oxygen gas should be given off.
Explanation:When potassium chlorate (KClO3) is heated, it decomposes to produce potassium chloride (KCl) and oxygen gas (O2). The balanced chemical equation for this reaction is:
2KClO3(s) → 2KCl(s) + 3O2(g)
In order to determine the amount of oxygen gas produced, we need to calculate the theoretical yield of oxygen gas. This can be done using stoichiometry and the molar mass of KClO3.
First, calculate the molar mass of KClO3:
39.10 g/mol (K) + 35.45 g/mol (Cl) + 3(16.00 g/mol) (O) = 122.55 g/mol
Next, use the molar mass of KClO3 to convert grams of KClO3 to moles:
6.50 g KClO3 * (1 mol KClO3 / 122.55 g KClO3) = 0.053 mol KClO3
According to the balanced chemical equation, 2 moles of KClO3 produce 3 moles of O2. Therefore, the number of moles of O2 produced can be calculated as:
0.053 mol KClO3 * (3 mol O2 / 2 mol KClO3) = 0.0795 mol O2
Finally, convert moles of O2 to grams:
0.0795 mol O2 * (32.00 g/mol O2) = 2.54 g O2
Therefore, when 6.50 grams of KClO3 are heated, approximately 2.54 grams of oxygen gas should be given off.
A child has a toy balloon with a volume of 1.80 L. The temperature of the balloon when it was filled was 293 K at a pressure of 101.3 kPa. If the child were to let go of the balloon and it rose 3 kilometers into the sky where the pressure of 67.6 kPa and the temperature is 263 K, what would the new volume of the balloon be?
Answer:
2.42L
Explanation:
Given parameters:
V₁ = 1.8L
T₁ = 293K
P₁ = 101.3kPa
P₂ = 67.6kPa
T₂ = 263K
Unknown:
V₂ = ?
Solution:
To solve this problem, we are going to use the combined gas law to find the final volume of the gas. The combined gas law expression combines the equation of Boyle's law, Charles's law and Avogadro's law;
[tex]\frac{P_{1} V_{1} }{T_{1} } = \frac{P_{2} V_{2} }{T_{2} }[/tex]
All the units are in the appropriate form. We just substitute and solve for the unknown;
101.3 x 1.8 / 293 = 67.6 x V₂ / 263
V₂ = 2.42L
Magnesium +Hydrogen Phospahate
Answer:
That makes Dimagnesium phosphate
Answer:
The reaction between Magnesium and Hydrogen Phosphate forms Magnesium Hydrogen Phosphate
Explanation:
When magnesium reacts with hydrogen phosphate it forms an ionic compound called Magnesium Hydrogen Phosphate or Dimagnesium Phosphate.
Magnesium Hydrogen Phosphate is an ionic compound with the formula HMgO4P.
Equation;
Mg + HPO4 ------> HMgO4P
Similarly we can use Magnesium Phosphate to demonstrate the reaction.
In chemistry, the sum of charges of the anion and the cation of any ionic compound is always equal to zero.
To determine the number of anion and cation required for the sum to be zero we simply use the criss-cross method. This involves taking the charge of one ion and making the absolute value of that charge to be the amount of the other ion.
Therefore, Magnesium having a charge of 2+; we will have two(2) Phosphate cations for it.
Also, Phosphate has a charge of 3-; so we have three(3) Magnesium cations.
Equation;
[tex]Mg^{2+} + (PO4)^{3-} ----> Mg3(PO4)2[/tex]
Which sample of argon contains a total of 3.01 x 10^23 molecules at STP?
A)40.0g B)22.4L C)20.0g D)11.2L
Answer:option d
Explanation:
Final answer:
The correct answer is 22.4L. At Standard Temperature and Pressure (STP), 1 mole of gas occupies 22.4 liters, allowing for the calculation of the total number of molecules in a given sample volume.
Explanation:
The correct answer is B) 22.4L. At STP (standard temperature and pressure), 1 mole of gas occupies 22.4 liters. Given that the question asks for the total number of molecules and not mass, we should consider the volume to calculate the number of molecules of argon. So, to contain 3.01 x 10^23 molecules, the sample should have a volume of 22.4 liters.
what are the number of molecules in 2.56 moles of water?
Answer:
1.54x10^24
Explanation:
To convert moles to molecules, multiply the number of moles by Avagadro's number (6.02x10^23).
2.56mol × 6.02x10^23 = 1.54x10^24
To find the number of molecules in 2.56 moles of water, we multiply the number of moles (2.56) by Avogadro's number (6.022 x 10²³), resulting in 1.54 x 10²⁴ molecules of water.
The question asks, what are the number of molecules in 2.56 moles of water? To answer this, we need to understand Avogadro's number, which is a fundamental concept in chemistry representing the number of units in one mole of any substance. Specifically, Avogadro's number is 6.022 x 10²³. Therefore, to find the number of molecules in 2.56 moles of water, we multiply the number of moles by Avogadro's number:
Number of molecules = 2.56 moles x 6.022 x 10²³ molecules/moleThis calculation gives us: 1.54 x 10²⁴ molecules of water in 2.56 moles.
The method of changing one or more chemical compounds
Answer:
chemical process
Explanation:
On sunny day the barometer reading was 765 mm Hg What is this measurement in atmospheres
Answer:
1.01atm
Explanation:
760mmHg = 1atm
765mm Hg = 765/760 = 1.01atm
Therefore, the barometer reading in atmosphere is 1.01atm
Charge of an electron
Answer: The charge on one electron is –1.6 x 10–19 coulomb.
Hope this helps!
An electron has a negative charge.
What is Keg for the reaction N2 + 3H2 = 2NH2 if the equilibrium
concentrations are [NH3] = 2 M [N2] = 3 M, and [H2] = 1 M?
O A. Keq = 0.67
O B. Keq = 0.75
O C. Keq = 1.33
O D. Keq = 1.5
Answer: The equilibrium constant for the given reaction is 1.33
Explanation:
We are given:
Equilibrium concentration of ammonia = 2 M
Equilibrium concentration of nitrogen gas = 3 M
Equilibrium concentration of hydrogen gas = 1 M
For the given chemical equation:
[tex]N_2+3H_2\rightleftharpoons 2NH_3[/tex]
The expression of [tex]K_{eq}[/tex] for above equation follows:
[tex]K_{eq}=\frac{[NH_3]^2}{[N_2][H_3]^3}[/tex]
Putting values in above equation, we get:
[tex]K_{eq}=\frac{(2)^2}{3\times (1)^3}\\\\K_{eq}=1.33[/tex]
Hence, the equilibrium constant for the given reaction is 1.33
0.349 M solution of CuOh is formed is the solution basic, acidic, or neutral?
Answer:
basic
Explanation:
A solution of copper (I)hydroxide is a base and it will form a basic solution no matter what.
A base is a compound the produces hydroxyl ions in aqueous solutions. Most known bases always have the OH⁻ group attached to them in a compound.
Copper(I) hydroxide is a an alkali as it can dissolve in water. It shares all the unique characteristics of a typical base and it will turn red litmus paper blue.
Which sample of ocean water would be the most likely to have the highest salinity?
Ocean water taken from the surface of the ocean
The warmest sample of ocean water
The ocean water taken from an area near the polar ice caps
Ocean water taken from the bottom of the ocean
Answer:
Ocean water taken from the surface of the ocean
Explanation:
Attached is a plot of ocean salinity vs. depth. It shows the highest salinity ocean water is surface water. A world-wide map of ocean salinity shows the highest salinity to be in mid-latitude regions in the middle of the ocean. Water near the North Pole has lower salinity than that for lower latitudes.
Probably the main reason for higher salinity at the surface is the high evaporation rate of water there, leaving behind the salt.
When is the color emitted from an atom
Answer:
Color is emitted from an atom when an electron jumps from a higher energy level to a lower energy level
Explanation:
According to Bohr's model of the atom, electrons are arranged into circular orbits, each orbit corresponding to a precise energy level.
In this model of the atom, electrons cannot be between two orbits: this means that the energy level of the atom are discrete, so they can only assume certain values.
As a result, when an electron jumps between two energy levels, it emits/absorbs a photon whose energy is equal to the difference in energy between the two levels.
In particular:
- If an electron jumps from a lower energy level to a higher energy level, it absorbs a photon
- If an electron jumps from a higher energy level to a lower energy level, it emits a photon
The energy of the emitted photon is equal to the difference in energy between the two levels, and it is related to the wavelength [tex]\lambda[/tex] of the photon by
[tex]E=\frac{hc}{\lambda}[/tex]
where h is the Planck's constant and c the speed of light.
For usual gases, the value of the energy E is such that the value of the wavelength [tex]\lambda[/tex] falls within the visible light range of the electronmagnetic spectrums, so we observe light emitted as different colors, depending on the wavelength.
HELP ASAP PLEASE...According to the mantle plume theory, what causes hot spots?
A.Thin places in the seafloor crack.
b.An upwelling of magma from the mantle gathers close to the Earth’s surface.
C.Chimney-like hydrothermal vents form on the seafloor.
D.Oceanic plates are subducted and volcanoes form.
B. An upwelling of magma from the mantle gathers close to the Earth’s surface
Hot spots, according to the mantle plume theory, are triggered by an upwelling of magma from the mantle that builds up near the Earth's surface. The magma is the result of extreme interior heat melting mantle material, which ascends and pierces the crust to form a hotspot.
Explanation:According to the mantle plume theory, hot spots are caused by an upwelling of magma from the mantle that gathers near the Earth’s surface. This magma is generated by the intense heat in the Earth's interior (the core), which causes material in the mantle to melt. When this molten material rises upwards, it can punch a hole in the crust and form a hotspot. Thus, the correct answer to your question is B: an upwelling of magma from the mantle gathers close to the Earth’s surface.
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Changes in the environment that cause an organism to respond are called?
Answer:
Anything in the environment that causes a change is called a stimulus.
Explanation:
Answer:
Anything in the environment that causes a change is called a stimulus.
Explanation:
Organisms react to many stimuli, including light, temperature, odor, sound, gravity, heat, water, and pressure. The ability of living things to react to stimuli is known as irritability.
15. Sulfur hexafluoride is an example of a
It is an example of a binary compound.
To make a 6.50M solution, how many moles of solute will be needed if 12.0 liters of solution are required
Answer:
78 moles of the solute
Explanation:
From the question;
Molarity of the solution is 6.50 M Volume of the solution is 12.0 LWe want to determine the number of moles needed
We need to know that;
Molarity = Number of moles ÷ Volume
Therefore;
Number of moles = Molarity × Volume
Hence;
Number of moles = 6.50 M × 12.0 L
= 78 moles
Thus, the moles of the solute needed is 78 moles
The form of energy that is found in large moving objects is _________ ________ energy.
Answer: The first one would be "_______ mechanical energy" second one is "gravitational potential energy"
Sorry; I have no idea at all what word would be placed in front of mechanical the only word that comes to mind is Kinetic but I think it may be wrong
Final answer:
Kinetic energy is the form of energy found in large moving objects. It is the energy of motion, allowing objects to perform work when they are in motion, and is calculated based on the object's mass and velocity.
Explanation:
The form of energy that is found in large moving objects is kinetic energy. Kinetic energy is the energy of motion, allowing objects to perform work when they are in motion. A few everyday examples of kinetic energy include a speeding bullet, a person walking, and the molecules in the air that move rapidly to produce heat. Anything that moves has kinetic energy, and the amount of kinetic energy an object possesses depends on both its mass and its velocity, as expressed by the formula KE = 1/2mv², where m is mass and v is velocity.
While kinetic energy is associated with motion, potential energy is energy that is stored. For instance, a wrecking ball held at a height has potential energy due to its position but when it's moving, that potential energy is converted to kinetic energy, highlighting energy transformation between the two forms.
Which has a larger radius: a sodium atom or a sodium ion? Explain why.
Answer:
sodium atom
Explanation:
the sodium ion loses a valence shell when it ionizes. The sodium atom retains this valence shell which adds to its radius
What does L represent? When did it form?
Answer:
All I can say is that it seems to go through the other layers. I would say this is an intrusive rock and probably the youngest
Explanation:
I suggest d i k e s. Put it together. somehow I cant post it when put together
Answer:
Layer L represents a fault line. It formed after layer E and all the layers beneath it. There is no displacement in layer G or layer A. Therefore, the fault line formed before these two layers.
Explanation:
this is the actual answer
a wave has a wavelength of 1.2m andr a frequency of 3 Hz. what is the wave speed
Answer:
3.6m/s
Explanation:
The following data were obtained from the question:
Frequency = 3Hz
Wavelength = 1.2m
Velocity =?
Velocity = wavelength x frequency
Velocity = 1.2 x 3
Velocity = 3.6m/s
2) C_H,(g) + 30,(g) → 2 CO2(g) + 2 H2O(g)
a) 2.7 mol of C,H, is reacted with 6.3 mol of 0,, how many moles of water will be
made?
b) What is the limiting reactant?
c) What is the excess reactant?
Answer:
a. 2.7 mol of water
b CH2.
c. O2
Explanation:
The complete equation of the reaction should be:
2CH2(g) + 3O2(g) → 2 CO2(g) + 2 H2O(g)
a) how many moles of water will be made?
To make 2 molecules of water (H2O) we need 2 molecules of CH and 3 molecules of O2.
We have 2.7 mol of CH2, the possible yield of water produced if it all used up will be:
2.7 mol * 2/2= 2.7 mol
We have 6.3 mol of O2, the possible yield of water produced if it all used up will be:
6.3 mol * 2/3 = 4.2 mol
Since the maximum yield of CH2 lower, we can have 2.7 mol of water and have some excess oxygen at the end of the reaction.
b) What is the limiting reactant?
A limiting reactant is a reactant that will be used up in the reaction. This reactant has the lowest stoichiometric ratio compared to other reactants, which make them the one depleted out first. Since they depleted, the reaction will stop. Thus they limit the number of reactions and called limiting reactants. If you add the limiting reactant, the reaction will continue.
The limiting reactant in this reaction is the CH2. When producing water molecules, all 2.7 mol of CH2 will be used while we still have O2 left.
c) What is the excess reactant?
The excess reactant will have some remains after the reaction stop. That is because the excess reactant has more mass than needed for the reaction that will use all limiting reactants. Since we still have remains, adding excess reactant won't continue the reaction.
The excess reactant in this question is O2 since it still has remained after we make 2.7 mol of water. The O2 remaining, in this case, will be:
6.3 mol - 2.7mol * 3/2= 2.25 moles