Answer:
1. C. helium
2. D. oxygen and acetylene
3. B. deliquescence
4. C. cutting very hard surfaces
5. B. 3.5%
Explanation:
Soluble substances can dissolve in certain solvents true or false
Answer:
True
Explanation:
Soluble substances dissolve.
Therefore they wouldn't be called soluble if they can't dissolve in solvents
Happy to help
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Soluble substances can dissolve in certain solvents this statement is true.
Solubility can be defined as the property of a given substance or solute to mix with a solvent. The solute can be a solid, liquid or gas which can be dissolved into a liquid solvent. Certain substances or solutes are solvable in all solvents in a particular proportion to form a solution. This property is called miscibility. The solubility can be seen in the case of polar solute and solvent. For example, ethanol is soluble in water.Hence, the given statement is true.
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Is hot dog relish homogeneous or heterogeneous
heterogenous, because it's a mix
Hot dog relish is a heterogeneous mixture because its composition is not uniform throughout. It contains visible differences in its components, such as pieces of vegetables like cucumber, onion, and peppers that are distributed unevenly in the relish.
Explanation:A hot dog relish is a heterogeneous mixture because its composition is not uniform throughout. Heterogeneous mixtures are characterized by having visible differences in their components. For example, hot dog relish contains small pieces of vegetables like cucumber, onion, and peppers that are distributed unevenly in the relish. You can visually identify the different components present in a hot dog relish, making it a heterogeneous mixture.
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A balloon filled with air has volume of 4.24 liters at 23.00°c if the balloon is cooked at constant pressure to 5.00°c what is it’s new volume? The balloons volume at 5°c is _____ liters
Answer: pV = nRT , or V = \frac{nRT}{p} , with p - pressure, V - volume, n - amount of substance, T - temperature in K.
Then: \frac{V_2}{V_1} = \frac{n_2RT_2p_1}{p_2n_1RT_1}
n_2 = n_1 , p_2 = p_1
V_2 = V_1 \cdot \frac{T_2}{T_1} = 4.24 \frac {(273.00+5.00)}{(273.00+23.00)}=3.98 l Explanation
The new volume is calculated using the Charles law formula
that is V1/ T1 = V2/T2 where,
V1 = 4.24 l
T1= 23c into kelvin = 23 +273 =296 K
T2 = 5.00 c into kelvin = 5.00 + 273 = 278 K
V2 = ?
by making V2 subject the subject of the formula by multiplying both side by T2
V2 = V1 xT2/ T1
V2 = (4.24 L x 278 K) / 296 k =3.98 L
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Explanation:
Answer:
Explanation:
They need to receive commands from Earth and send the data they collect back to Earth. ... These radio dishes also receive the information sent to Earth by the spacecraft. NASA spacecraft operating well out of Earth's orbit use the Deep Space Network (DSN).
Two opposing reaction (a + b c+D) occurring simultaneously
Answer:
redox reaction
Explanation:
it's the only reaction occurs simultaneously, reduction and oxidation occur at the same time
What implications need to be considered when creating environmental policies?
Check all that apply.
How much will it cost?
How will it affect the environment?
How will it affect people?
Is the benefit worth the cost?
How will it reduce tourist activity?
Answer:
How will it affect the environment? Is its benefit worth the cost?
Explanation:
when creating environmental policies you should always look into if it is worth it or not and how it will affect the environment
Answer:
It is A,B,C and D
Explanation:
I just took the test
which of these is the most accurate description of the job of an art conservationist?
Answer:
Preserve paintings and different works of art
We have that for the Question "Which of these is the most accurate description of the job of an art conservationist?" it can be said that The option bearing the description "An art conservationist is a Person who's profession is to persevere art works for as much time as possible as it gains value over time just like wine" is the best description of the job of an art conservationist?
From the question we are told
Which of these is the most accurate description of the job of an art conservationist?
Generally
An art conservationist is a Person who's profession is to persevere art works for as much time as possible as it gains value over time just like wine
Therefore
The option bearing the description "An art conservationist is a Person who's profession is to persevere art works for as much time as possible as it gains value over time just like wine" is the best description of the job of an art conservationist?
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What chemical phenomenon accounts for the elasticity seen in solids?
Answer:
covalent bond
ionic bond
hydrogen bond
hope this helps enjoy
Explanation:
Final answer:
The elasticity seen in solids is due to the forces between atoms acting like springs that can be stretched or compressed but not easily broken. This allows solids to return to their original shape after the external forces causing deformation are removed.
Explanation:
Elasticity in solids is a result of the atoms in the material being in close contact and vibrating but not changing positions with neighboring atoms. The forces between the atoms act like springs that can be stretched or compressed but not easily broken. This resistance to deformation and ability to return to their original shape is what causes the elasticity seen in solids. For example, when a solid is stretched, the atomic springs are stretched, but when the force is removed, the springs bring the material back to its original shape.
I have a cylinder sitting in my lab that contains 0.7500 L of gas, and it's pressure is 16.24 psi. If I relieve the cylinder and change the pressure to 6.961 psi, what will be the new volume of the gas in L?
Answer:
1.633L
Explanation:
P1 = 16.24psi
V1 = 0.700L
P2 = 6.961psi
V2 = ?
Using Boyle's law, P1V1 = P2V2
V2 = P1V1/P2
V2 = 16.24*0.7/6.961
V2 = 1.633L
Which statement is part of the kinetic molecular theory?
Answer:
Explanation:
Kinetic Molecular Theory states that gas particles are in constant motion and exhibit perfectly elastic collisions.The average kinetic energy of a collection of gas particles is directly proportional to absolute temperature only.
Answer: Kinetic Molecular Theory states that gas particles are in constant motion and exhibit perfectly elastic collisions.
Explanation: Kinetic Molecular Theory can be used to explain both Charles' and Boyle's Laws. The average kinetic energy of a collection of gas particles is directly proportional to absolute temperature only.
is a process of reacting an acid with a base until an equivalence point is reached
Calorimetry
Distillation
Titration
Buretting
It’s TITRATION DJDKSKDKXKDKDKKD please name me brainest
I need help ASAP!!!!!!!!!
B. The hole in the ozone layer got smaller
C. The hole in the ozone layer over Antarctica got bigger.
If you look at the Dobson unit scale the lighter the color over Antarctic the greater the ozone hole gets.
2.5 moles of sodium chloride is dissolved
to make 0.050 liters of solution.
whats the question?????
The transfer of energy by heat flow through a substance is accomplished by
The transfer of energy by heat flow through a substance is accomplished by convection.
Answer:
The real answer is conduction.
Trust me on this one, it's correct. If you put the other answer, you will get it wrong. The answer is conduction, and I am 100% positive! :)
A sample of gas with a volume of 2.0 L at STP is found to have a mass of 1.43 g. Calculate the molecular mass of this gas. Is it possible this gas is methane? Why or why not?
Answer:
15.9gmol⁻¹
The gas could have been methane when we compare the two molecular masses.
Oxygen gas, O₂ also shares this same number for its molecular mass. This would be the reason why it would not be methane.
Explanation:
Given parameters:
Volume of gas at STP = 2.0L or 2.0dm³(1L = dm³)
Mass of the gas = 1.43g
Unknown:
Molecular mass of the gas = ?
Solution
We can find the number of moles using the mole concept according to the equation below:
number of moles = ³⁻¹[tex]\frac{volume occupied(dm^{3} )}{22.4dm^{3}mol^{-1} }[/tex]
number of moles = [tex]\frac{2.0dm^{3} }{22.4dm^{3}mol^{-1} }[/tex]
number of moles = 0.089mol
Using this obtained number of moles, we can derive the molecular mass of the compound by using the relationship between mass and number of moles according to the equation below:
molecular mass = [tex]\frac{mass}{number of moles}[/tex]
molecular mass = [tex]\frac{1.43}{0.089}[/tex]
molecular mass of the gas = 15.9gmol⁻¹
The formula of methane gas is CH₄.
Let's calculate the molecular mass of methane using these atomic masses:
C = 12g and H = 1g
The molecular mass = 12 + (1x4) = 16gmol⁻¹
The gas could have been methane when we compare the two molecular masses.
Oxygen gas, O₂ also shares this same number for its molecular mass. This would be the reason why it would not be methane.
A yield of NH3 of approximately 98% can be obtained at 200°C and 1,000 atmospheres of pressure.
How many grams of N2 must react to form 1.7 grams of ammonia, NH3?
Answer:
1.429 g of N₂
Explanation:
The Haber process is a reaction that combines nitrogen with hydrogen to form ammonia according to the following balanced equation:
N₂ ₍g₎ + 3 H₂ ₍g₎ ⇆ 2NH₃ ₍g₎One can note that 1 mol of N₂ react with H₂ to produce 2 mol of NH₃.
We cannot compare weight of a substance (in grams) to another in chemical reactions, but we can use moles, then we have to convert the weight of NH3 to moles.
no. of moles of NH₃ = (mass / molar mass) = (1.7 g / 17 g/mol) = 0.1 mol
and the actual yield is 98% , then the theoretical number of moles that would be produced are:
percent yield = (actual yield / theoretical yield) × 10098 = (0.1 mol / theoretical yield) × 100
theoretical no. of moles of NH₃ = (0.1 * 100) /98 = 0.102 mol
using cross multiplication
1 mol of N₂ → 2 mol of NH₃.
?? mol of N₂ → 0.102 mol of NH₃.
no of moles of N₂ = [(1 mol * 0.102 mol) / 2 mol] = 0.051 mol
Last step is to convert the moles back to grams using:
mass = (no of moles of N₂ * molar mass of N₂)
= (0.051 mol * 28 g/mol) = 1.429 g
5,6-dimethyl-2-octyne
5,6-dimethyl-2-octyne is an organic compound with eight carbon atoms in the longest chain, a triple bond starting on the second carbon, and methyl groups attached to the fifth and sixth carbons.
Explanation:The subject of the question, 5,6-dimethyl-2-octyne, is a compound in organic chemistry. It is a type of Alkyne, a hydrocarbon with a carbon-carbon triple bond. In this case, 'octyne' tells us there are eight carbon atoms in the longest chain, with the triple bond starting at the second carbon. '5,6-dimethyl' tells us that there are methyl groups (-CH3) attached to the fifth and sixth carbons in the chain.
For comparison, consider 4-fluoro-4-methyl-1-octyne from your reference. '4-fluoro-4-methyl' indicates there is a methyl group and a fluorine atom on the 4th carbon, and '1-octyne' specifies there are eight carbons and the triple bond starts at the first carbon.
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Need help on this ASAP !!!!
Answer:
2Na + I₂ → 2NaI. "Synthesis reaction"
Explanation:
To balance the equation, you should apply the law of conservation of mass for the equations.The law of conservation of mass states that the no. of each atom is equal in both sides (reactants and products).
The balanced equation is:
2Na + I₂ → 2NaI.
It is a synthesis reaction that 2 reactants give 1 product.
That 2.0 mole of Na combined with 1.0 mole of I₂ to produce 2.0 moles of NaI.
The no. of all atoms is the same in both of reactants and products side.
Na (2), and I (2).
Explain how you calculate the net force in any direction on the box
The magnitude of the net force acting on an object is equal to the mass of the object multiplied by the acceleration of the object as shown in the formula below. If the net force acting on an object is zero, then the object is not accelerating and is in a state that we call equilibrium.
The net force in any direction on the box is the product of its mass and acceleration of box in direction of motion.
What is Force?The force is the action of push or pull which makes an object to move or stop.
The net force acting on any object is the product of the mass of the object and the acceleration of the object
F = m x a
If an object is moving with constant velocity, the net force acting on it is zero because the object will not be accelerating or in equilibrium state.
As, the acceleration is the vector quantity, the force is also a vector quantity. Thus, in the direction of force, the box will be accelerated.
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The reactions listed below are either chemical reactions or nuclear reactions. Which are nuclear reactions? Check all that apply.
It is seen that in first and third ones elements are not changed but only their chemical arrangements are changed. both are chemical reactions.
In the second and last one elements are changed after the reaction and as we know non chemical reactions are not capable of doing that so they are nuclear reactions.
There are other ways to tell like checking number of neutrons as well but in this simple case I don't think it is necessary to check those.
Good luck!
Answer:
B and D
Explanation:
Option A is incorrect as it is a neutralization reaction. Option C is incorrect as it an oxidation reaction, the rusting of iron to form iron oxide.
Option B and D are nuclear reactions called alpha decay.
In an alpha decay, a helium atom is released, and the daughter nucleus formed has atomic number 2 less than the parent nucleus and mass number 4 less than the parent nucleus.
In the image, two circles are centered at A. The circle containing B was dilated to produce the circle containing B′. What is the scale factor of the dilation?
The scale factor of a dilation is determined by comparing measurements of an original figure and its dilation. In the case of two-dimensional figures like circles, one common approach is to compare corresponding lengths or distances in both figures. In this case, without specific numerical measurements, we can't provide a concrete numerical value for the scale factor.
In order to find the scale factor of the dilation, it's important to understand what a dilation is first. In maths, when we are working with geometry, a dilation takes a figure and scales it larger or smaller. The scale factor is the measure by which the original figure is stretched or shrunk.
We calculate the scale factor by comparing the measurements of an original figure and its dilation. For two-dimensional figures, if we compare corresponding lengths in the pre-image and image, we can determine the scale factor. However, in this question, we aren't given specific numbers. If we assume the distance from A to B is r and from A to B' is r', the scale factor would then be r'/r.
In the special case of circles, a dilation centered at the center of the circle will create a similar circle with a scale factor equal to the ratio of their radii or, equivalently, to the square root of the ratio of their areas. If we had actual numeric values for those lengths or areas, we could provide a definite number for the scale factor.
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What is the formula for the compound barium hydroxide pentahydrate?
Answer: Ba(OH)2.5H20
Explanation:
The salt is a hygroscopic and contains 5 moles (penta) of water attached to it, hence the ".5H2O".
Yes, blue copper sulfate pentahydrate can be ground and used as a pigment for making paint. Copper sulfate pentahydrate is a compound that contains copper, sulfur, and oxygen. When ground into a fine powder, it can create a blue pigment that is commonly used in paint.
The reason why copper sulfate pentahydrate can be used as a pigment is because of its chemical properties. Copper sulfate pentahydrate has a vibrant blue color due to the presence of copper ions. These ions absorb certain wavelengths of light, reflecting only the blue color. When mixed with a binder, such as a resin or oil, the ground copper sulfate pentahydrate can be easily applied to a surface to create a blue hue.
However, it's important to note that copper sulfate pentahydrate can be toxic if ingested or inhaled, so precautions should be taken when handling and using it. It is always recommended to follow safety guidelines and use appropriate protective equipment when working with any potentially hazardous materials.
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who named earth if no one knew what earth was?
WOW! I never thought of that.... Is this a question on the test?
Help ASAP ! Due tomorrow.
Answer:
1. 0.6678 atm.
2. 181.9 mm Hg.
3. 379.8 K = 106.8°C.
4. 691.8 mm Hg.
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 V are constant, and have different values of P and T "Lussac law":(P₁T₂) = (P₂T₁)
Q1:
∵ (P₁T₂) = (P₂T₁)
P₁ = 0.5 atm, T₁ = 25°C + 273 = 298 K.
P₂ = ??? atm, T₂ = 125°C + 273 = 398 K.
∴ P₂ = (P₁T₂)/(T₁) = (0.5 atm)(398 K)/(298 K) = 0.6678 atm.
Q2:
∵ (P₁T₂) = (P₂T₁)
P₁ = 47.0 mm Hg, T₁ = 77.0 K.
P₂ = ??? mm Hg, T₂ = 25°C + 273 = 298 K.
∴ P₂ = (P₁T₂)/(T₁) = (47.0 mm Hg)(298 K)/(77 K) = 181.9 mm Hg.
Q3:
∵ (P₁T₂) = (P₂T₁)
P₁ = 248.0 kPa, T₁ = 0°C + 273 = 273 K. .
P₂ = 345.0 kPa, T₂ = ??? K.
∴ T₂ = (P₂T₁)/(P₁) = (345.0 kPa)(273 K)/(248.0 kPa) = 379.8 K = 106.8°C.
Q4:
∵ (P₁T₂) = (P₂T₁)
P₁ = 745.0 mm Hg, T₁ = 22°C + 273 = 294 K. .
P₂ = ??? mm Hg, T₂ = 0°C + 273 = 273 K.
∴ P₂ = (P₁T₂)/(T₁) = (745.0 mm Hg)(273 K)/(294 K) = 691.8 mm Hg.
What is the net charge of an ion that has 11 protons, 10 electrons, and 12 neutrons?
Answer:
+1
Explanation:
To calculate the charge on an ion, we simply use the number of protons and electrons. Protons are the positively charged subatomic particles. The electrons are the negatively charged particles in an atom.
When the number of protons are greater than that of electrons, the ion is positively charged.
When the number of protons are lesser than that of electrons, the ion is negatively charged.
When the number of protons and electrons are equal, the ion is neutral.
Charge = Protons - Electrons = 11 - 10 = +1
The net charge of an ion that has 11 protons, 10 electrons, and 12 neutrons is +1
Protons and electrons are used to determine the net charge on an ion. Protons are positively charged while electrons are negatively charged.
The net charge on an ion is the difference between the number of protons to the number of electrons.
The net charge of an ion = number of protons - number of electrons
The net charge of an ion = 11 - 10 = +1
Hence the net charge of an ion that has 11 protons, 10 electrons, and 12 neutrons is +1
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How many grams would 3.36 × 1023 molecules of copper (II) sulfate (CuSO4) weigh?
Answer:
The mass of copper(II)sulfate are, 89.6 grams
Explanation:
Molecules of =
Molar mass of = 160 g/mole
First we have to calculate the moles of .
As, number of atoms present in 1 mole of
So, number of atoms present in mole of
Now we have to calculate the mass of
Therefore, the mass of copper(II)sulfate are, 89.6 grams
when 1.0g of diethyl ether is converted to vapor at its boiling point, about how much heat is absorbed? (C4H10O, Hvap= 15.7kj/mol, boiling point:34.6°C)
A) 2 J
B) 2 kj
C) 0.2 J
D) 0.2 kj
(Please show how you got the answer.)
Answer:
Option D = 0.2 Kj
Explanation:
Given data:
Mass of diethyl ether = 1.0 g
Hvap = 15.7 Kj / mol
Heat absorbed = ?
Solution:
Q = mass × Hvap / molar mass
Q = 1.0 g × 15.7 Kj / mol / 74.12 g/mol
Q = 15.7 Kj / 74.12
Q = 0.212 KJ
Answer:
its A)
Explanation:
In a hydrogen fusion reaction two lighter hydrogen nuclei merge to form a heavier more stable helium nucleus. The energy that is released in a hydrogen fusion reaction is
Answer:
is very large and it provides the needed temperature for another set of fusion
Explanation:
Nuclear fusion is the combination of two atomic nuclei into larger ones.
One of such is used in making hydrogen bonds.
In nuclei fusion,
²₁ H + ²₁ H → ⁴₂He + energy
This is an example of nuclear fusion.
The energy helps to further the fusion process and a chain reaction occurs and a massive amount of energy is released.
when lead nitrate reacts whith sodium iodide, sodium nitrate and lead iodide are formed if i start with 25.0 grams of lead nitrate and 15.0 grams of sodium iodide, find the percent yield if this reaction forms 6.0 g of sodium nitrate during the experiment
Pb(NO3)2+ 2NaL--> PbL2+ 2NaNO3
So you find the moles of the lead nitrate by doing mass/Mr so 25/331.2 which gives you 0.075
Due to stoichiometry in the reaction we see 1:2 ratio so we do 0.075x2 gives 0.15 moles of NaNO3
Then mass: moles x Mr so 0.15 x 85= 12.75g is your theoretical
So % yield is actual/ theoretical x 100
Therefore 6.0g/12.75 g x 100 = 47%
Not sure if it’s correct hope it helps!
How many grams are in 98 L of o2 at stp
Answer:
139.9 g ≅ 140.0 g.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm (P = 1.0 atm, standard P).
V is the volume of the gas in L (V = 98.0 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 = 273 K, standard T).
∴ n = PV/RT = (1.0 atm)((98.0 L)/(0.0821 L.atm/mol.K)(273 K) = 4.37 mol.
To find the grams of O₂, we can use the relation:n = mass/molar mass.
∴ mass of O₂ = (n)*(molar mass) = (4.37 mol)(32.0 g/mol) = 139.9 g ≅ 140.0 g.
What best describes the heat transfer when kinetic energy is converted into potential energy?
A)exothermic
B)endothermic
C)both
D)neither
The conversion of kinetic energy to potential energy is neither exothermic nor endothermic, as it involves the transformation of energy forms within a system, not heat transfer to or from the environment. Option D is correct.
The conversion of kinetic energy to potential energy does not involve heat transfer but rather the transformation of one form of mechanical energy to another within a system. An exothermic process is one in which energy is released to the surroundings, usually in the form of heat, such as when a solid burns brightly, while an endothermic process absorbs energy from the surroundings.
For example, when two chemicals are mixed and their temperature drops, it is considered endothermic because the chemical system absorbed heat from the surroundings.
Hence, D. is the correct option.