Answer: 612C
Explanation: 49B + 24He —> 612C + 01n
The expression of 5522 km in scientific notation is
Answer:
5.522 * 10^3.
Explanation:
5522 = 5.522 * 10^3 .
what is the molarity of a 5.0 L solution that contains 0.5 moles of KNO3
The molarity of the KNO3 solution is 0.1 M.
To calculate the molarity of a KNO3 solution, we use the formula for molarity:
Molarity (M) = moles of solute / liters of solution
In this case:
Moles of KNO3 = 0.5 moles
Volume of solution = 5.0 L
Using the formula:
Molarity (M) = 0.5 moles / 5.0 L = 0.1 M
The molarity of the KNO3 solution is 0.1 M.
Nitrogen gas occupies a volume of 500ml at a pressure of 0.971atm. What volume wi
the gas occupy at a pressure of 1140 mm Hg, assuming the temperature remains
constant?
Answer: 323.67ml
Explanation:please see attachment for explanation. Thanks
To find the new volume of the nitrogen gas at a different pressure, we can use the gas law equation PV = nRT. By rearranging the equation and plugging in the given values, we can calculate the new volume.
Explanation:To solve this problem, we can use the gas law equation: PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin. Since the temperature remains constant, we can simplify the equation to PV = constant. First, we need to convert the pressure from mm Hg to atm by dividing it by 760. Then, we can use the equation to find the new volume:
P1V1 = P2V2
Plugging in the values and solving for V2:
V2 = (P1 * V1) / P2
Let's substitute the given values:
V2 = (0.971 atm * 500 ml) / (1140 mm Hg / 760 mm Hg/ atm)
After converting mL to L and performing the calculation, we get:
V2 = 0.207 L
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Which of the following is a physical property of copper
Physical properties of copper metal are high thermal conductivity, high electrical conductivity, ductility, malleability etc.
A physical property is a characteristic of matter that can be observed or measured without changing the substance itself. Examples include color, shape, density, and melting point.
Copper is a metal that has several physical properties that make it useful in various applications. Some of the physical properties of copper are:
1. High thermal conductivity: Copper is an excellent conductor of heat, which makes it useful in various applications such as electrical wiring, plumbing, and heating systems.
2. High electrical conductivity: Copper is also an excellent conductor of electricity, which makes it useful in electrical wiring and other electrical applications.
3. Ductility: Copper is a highly ductile metal, which means it can be easily drawn into wires or other shapes without breaking.
4. Malleability: Copper is a highly malleable metal, which means it can be easily shaped or flattened into thin sheets.
5. Corrosion resistance: Copper is resistant to corrosion, which makes it useful in various applications where it is exposed to moisture or other corrosive materials.
In conclusion, high thermal conductivity, high electrical conductivity, ductility, malleability are the physical properties possessed by copper.
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Final answer:
A physical property of copper includes its malleability, ductility, high thermal and electrical conductivity, and its characteristic pinkish-orange color when freshly exposed.
Explanation:
The question involves identifying a physical property of copper. A physical property can be observed or measured without changing the substance's identity. For copper, some of its physical properties include its reddish-brown color, malleability, ductility, and high thermal and electrical conductivity. Since copper is such a good conductor of electricity, it is often used in electrical wiring. Being ductile, it can be stretched into wires without breaking. Copper's pinkish-orange color when freshly exposed is another key physical property.
The motion of particles in an object the faster the particles move the warmer the object will feel
Answer:
This is true.
Explanation:
Speed of the particles in terms of energy is described by kinetic energy. Kinetic energy is directly proportional to the square of velocity. Essentially, the greater the speed of the particles, the greater the kinetic energy.
Now, let's say our particles are in some specific container. When particles move fast, they possess high kinetic energy. The greater the kinetic energy the more of it can be transferred to the walls of a container when particles collide with them. This is transferred as another energy form, heat. Particles lose a fraction of their kinetic energy by transferring it to the container and heating it up.
in the wave-mechanical model, an orbital is a region of space in an atom where there is
Answer:
electrons
Explanation:
The orbitals are the spaces around the nucleus.
Neutrons and protons are in the nucleus of an atom, and the electrons revolve around the nucleus.
Total mass of H2O2 in 20 grams of an aqueous H2O2 solution
Answer:
3= (x/20.0g) x 100%
or (20)(0.03)
Answer 0.6g
Final answer:
The total mass of H2O2 in a 20 grams 3.00% aqueous H2O2 solution is 0.6 grams, calculated by taking 3.00% of the total mass of the solution.
Explanation:
To calculate the total mass of H2O2 in 20 grams of a 3.00% aqueous H2O2 solution, use the percentage by mass. The mass of H2O2 can be found by multiplying the total mass of the solution by the percentage of H2O2 in the solution (3.00%).
The calculation is as follows:
Total mass of the solution = 20 gramsPercentage of H2O2 by mass = 3.00%Mass of H2O2 = 20 grams × 3.00% = 0.6 gramsTherefore, the amount of H2O2 in a 20 grams aqueous solution is 0.6 grams.
A plutonium atom undergoes nuclear fission. Identify the missing element in the nuclear equation.
230 pu
Answer:
[tex]_{92}^{226}U[/tex]
Explanation:
Let's firstly identify the atomic number (the number of protons) of Pu. This is done by referring to the periodic table and finding Pu. The atomic number of Pu is:
[tex]Z=94[/tex]
In order to identify the type of a nuclear decay, we need to find the N/Z ratio. This is the ratio between the number of neutrons and the atomic number of an isotope. The number of neutrons is found by subtracting the number of protons from the mass number:
[tex]N=M-Z[/tex]
That said, the N/Z ratio equation becomes:
[tex]N/Z=\frac{M-Z}{Z}=\frac{M}{Z}-1=\frac{230}{94}-1=1.45[/tex]
This is a relatively high number thinking about the belt of stability of isotopes. Ideally, stable isotopes with a low Z value have an N/Z ratio of 1. Heavier isotopes with Z > 50 would have a slightly higher N/Z ratio and would be stable around N/Z = 1.25. This means we wish to decrease the N/Z ratio as much as possible.
Among all the decays, alpha-decay is preferred to decrease the N/Z ratio significantly (1.45 is much higher than 1.25). That said, we'll release an alpha particle with some nucleotide X of mass M and atomic number Z:
[tex]_{94}^{230}Pu\rightarrow _Z^MX+_2^4\alpha[/tex]
According to the mass and charge conservation law:
[tex]230=M+4\therefore M=230 - 4 = 226[/tex]
[tex]94=Z+2\therefore Z = 94-2 = 92[/tex]
Identify an element with Z = 92 in the periodic table. This is uranium, U:
[tex]_{92}^{226}U[/tex]
the oldest and farthest celestial bodies of the universe
Answer:
GN-z11 is the oldest
Explanation:
GN-z11 has a spectroscopic redshift of z = 11.09, which corresponds to a proper distance of approximately 32 billion light-years
Globular clusters are some of the oldest structures in the Milky Way, with ages suggesting the age of the universe to be at least around 11 to 13 billion years old. The Boomerang Nebula is among the youngest and coldest objects known. The study of distant galaxies and ancient globular clusters helps astronomers understand the early universe.
The oldest and farthest celestial bodies in the universe provide insight into the universe's early history. Globular clusters are among the oldest structures in our Galaxy, with the youngest being about 11 billion years old, setting a lower limit for the age of the universe. Our Milky Way, containing such ancient globular clusters, suggests it was born at least 13 billion years ago. One famous globular cluster, M13, is roughly 26,000 light-years away from us and has an estimated mass of around a million times that of the Sun. In contrast to these ancient objects, the Boomerang Nebula is a much younger planetary nebula and is currently the coldest known object in the Universe.
In order to understand the early universe, astronomers study not only globular clusters but also very distant galaxies, as they provide a view of the universe when it was very young. Observations of stars in the halo of the Milky Way, red giant stars, suggest distances of almost 1 million light-years, indicating the immense scale and diversity of structures within our galaxy.
What is the answer to this chemthink?
Answer:
I think its allow some to leak out into the air and leve it out on a cold day sorry if its wrong <3
Explanation:
Help please!
Pretend you have a job building tricycles. If you had 200 handle bars, 150 wheels,
250 pedals, and 75 seats. What is the limiting reactant?
Answer:
Correct answer - wheels
Explanation:
Limiting reactant:
The reactant that is used up first in the chemical reaction.i.e. the reactant that restricts the amount of product that can be produced.The unused product left in the reaction.
For example,
[tex]2H_{2}+O_{2}\rightarrow 2H_{2}O[/tex]
The ratio of creating [tex]H_{2}O[/tex] is
[tex]2molH_{2}:1molO_{2}:2molH_{2}O[/tex]
If you had 8 moles of hydrogen and only 3 moles of oxygen ;you would have enough oxygen to produce 6 moles of water with 2 moles of hydrogen leftover.
From the given,
200 handle bars, 150 wheels, 250 pedals, and 75 seats.
For tricycle making, each one required one seat, handle,two pedals and three wheels.
Hence, wheels are first consumed.
Therefore, wheels are limiting reactant.
Suppose 17 grams of sucrose is dissolved into 183 grams of water. What is the concentration of sucrose in ppm?
Answer:
85 x 10³ ppm
Explanation:
Data Given:
mass of sucrose = 17 g
mass of water = 183 g
Concentration in ppm = ?
Solution:
Formula Used
Concentration (ppm) = Solute / Solution x 10⁶ ............ (1)
**Note : 1 ppm = 1 mg / L
First we have to know about mass of solution
So
Mass of solution = mass of solute + mass of solvent ................. (2)
Put values in equation 2
Mass of solution = 17 g sucrose + 183 g water
Mass of solution = 200 g
Now Put Values in equation 1
Concentration (ppm) = Solute / Solution x 10⁶
Concentration (ppm) = 17 g / 200g x 10⁶
Concentration (ppm) = 0.085 x 10⁶
Concentration (ppm) = 85 x 10³
Concentration of sucrose = 85 x 10³ ppm
The concentration of sucrose in the solution is 85,000 parts per million (ppm).
Explanation:The concentration of sucrose in the given solution can be calculated using the formula:
Concentration (ppm) = mass of solute (g) / mass of solution (g) x 10^6
For this case, the mass of sucrose is 17 grams and the mass of the solution (sucrose + water) is 17 grams + 183 grams = 200 grams. Plugging in the values, we get:
Concentration (ppm) = 17 g / 200 g x 10*6 = 85,000 ppm
Therefore, the concentration of sucrose in the solution is 85,000 parts per million (ppm).
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Which of the following shows both the correct formula and correct name of an acid?
Answer:
Hydrochloric acid (HCl)
Answer: C
Explanation:
If 84 grams of sodium chloride reacts with an excess amount of magnesium oxide, how many grams of sodium oxide will be produced
Answer:
56.0g (3 s.f.)
Explanation:
Please see attached picture for full solution.
How many convalent bonds are there in one molecule of carbon dioxide, CO2?
(A) 0 covalent bonds
(B) 2 covalent bonds
(C) 4 covalent bonds
(D) 6 covalent bonds
Answer:
C 4 convalents bonds
Explanation:
I don't no the explanation
The one molecule of carbon dioxide, CO₂ contain 2 covalent bond. Therefore, option B is correct.
What is covalent bond ?An electron exchange that results in the formation of electron pairs between atoms is known as a covalent bond. Bonding pairs or sharing pairs are the names given to these electron pairs. The equilibrium between the forces that attract and repel atoms.
An atom can establish bonds with other atoms in two main ways: covalent and ionic. The sharing of electrons between two or more atoms forms a covalent connection.
Each oxygen atom in carbon dioxide forms two covalent bonds with the carbon atom, known as a double bond and represented here as two lines. However, in symmetrical molecules, the attraction of the atoms on the electrons is equal, and the charge distribution is uniform. Nonpolar molecules are those with symmetry.
Thus, option B is correct.
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Phosphoric acid (H3PO4) and boric acid (H3BO3) each dissociate fully producing four ions in solution
A)True
B) False
B) False
Explanation:
Phosphoric acid (H₃PO₄) and boric acid (H₃BO₃) are weak acids, so they will not fully dissociate in solution.
Bellow you mai find the dissociation reactions of the acids:
H₃PO₄ + H₂O ⇄ H₂PO₄⁻ + H₃O⁺
H₂PO₄⁻ + H₂O ⇄ HPO₄²⁻ + H₃O⁺
HPO₄²⁻ + H₂O ⇄ PO₄³⁻ + H₃O⁺
Phosphoric acid (H₃PO₄) produces four ions in solution: H₂PO₄⁻, HPO₄²⁻, PO₄³⁻ and H₃O⁺.
H₃BO₃ + H₂O ⇄ H₂BO₃⁻ + H₃O⁺
H₂BO₃⁻ + H₂O ⇄ HBO₃²⁻ + H₃O⁺
HBO₃²⁻ + H₂O ⇄ BO₃³⁻ + H₃O⁺
Boric acid (H₃BO₃) produces four ions in solution: H₂BO₃⁻, HBO₃²⁻, BO₃³⁻ and H₃O⁺.
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13. Base your answer to the following question on the information below and you knowledge of chemistry,
A 100.-gram sample of liquid water is heated from 20.0°C to 50.0°C. Enough KCION(S) is dissolved
in the sample of water at 50.0°C to form a saturated solution.
Using the information on Table B, determine the amount of heat absorbed by the water
when the water is heated from 20.0°C to 50.0°C.
Answer:
Heat absorbed by water is 12540 J
Explanation:
Given data:
Mass of water = 100 g
Temperature changes = 20.0°C to 50.0°C
Heat absorbed by water = ?
Solution:
Specific heat of water is 4.18 j/g.°C
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 50.0°C - 20.0°C
ΔT = 30.0°C
Q = m.c. ΔT
Q = 100 g. 4.18 j/g.°C. 30.0°C
Q = 12540 J
Heat absorbed by water is 12540 J.
Using the formula for heat absorption (q=mcΔT), we can calculate that the water absorbed 12,552 joules of heat when it was heated from 20.0°C to 50.0°C.
Explanation:In order to determine the amount of heat absorbed by the water when being heated from 20.0°C to 50.0°C, we can use the formula q = mcΔT.
Here, 'q' is the heat absorbed, 'm' is the mass, 'c' is the specific heat capacity of water, and 'ΔT' is the change in temperature. Given the mass (m) of the water is 100.0 grams, the specific heat capacity (c) of water is 4.184 J/g°C, and the change in temperature (ΔT) is 50.0°C - 20.0°C = 30.0°C.
Substituting these values into the equation gives q = (100.0g)(4.184 J/g°C)(30.0°C) = 12,552 joules. Therefore, the water absorbed 12,552 joules of heat when it was heated from 20.0°C to 50.0°C.
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Which gas has properties that are most similar to those of an ideal gas
Answer:
H2
Explanation:
The gas which is considered to be ideal is helium as it has a single atom. Among the options for this question, H2 is the gas which has properties similar to ideal gas.
The characteristics of an ideal gas are:
They have a small structureThey do not tend to form electrical bonds with other neighbouring molecules.Molecules of H2 exhibit both these properties hence H2 is the correct option.
During all chemical reactions,mass energy, and charge are...
1.Absorbed
2.Formed
3.Conserved
4.Released
Answer:
3
Explanation:
According to law of conservation of mass energy and charge the mass energy and charge will remain conserved.
13. When iron nad is put in to a beaker containing copper sulphate solution.
of the solution slowly change in to Green
a) Why does the colour of the solution change?
b) Write the equation involved in this process?
c) Is it a chemical or physical change?
Answer:
A simple displacement reaction occurs when an iron nail is immersed to a beaker containing copper sulphate solution.
a)
Iron is more reactive than copper. As a result a displacement reaction will take place. The ferrous or Fe (II) irons will move to the solution. The copper ions (Cu II) will get deposited on the nail. This will cause the colour to change from blue to green.
b)
The equation can be written as:
Fe (s) + CuSO4 (aq) -> FeSO4 (aq) + Cu (s)
c)
A chemical change can be described as a change that causes a substance to change to another form. Hence, this reaction is a chemical change.
which of these is true about pure substances?
A. they can only contain one type of atom
B. They can only contain one type of molecule
C. they may contain one type of atom or one type of molecule
D. they can contain different types of atoms and molecules
Answer:
They can only contain one type of atoms, one type of molecules or one type of ionic salts
Explanation:
Remember that substances might be made of:
just one type of atoms: the examples would usually be metals, such as sodium metal (Na) consisting of solely sodium atoms, iron (Fe) metal, gold (Au) metal, as well as gases (typically noble gases, He, Ne, Xe, Ar, Kr, Rn);molecules: the examples would be water consisting of [tex]H_2O[/tex] molecules, any gas, such as [tex]O_2, F_2, SO_3, CO_2[/tex] etc.;ions: the examples would involve any salt, such as NaCl, KBr, NaF etc.That said, pure substances would only contain one type of atoms, one type of molecules or one type of ionic salts. Any additional components of different atoms, molecules or ionic salts would cause a pure substance to become a mixture of several substances.
Answer:
they may contain one type of atom or one type of molecule
Na + MgF^2 = NaF+ Mg
Answer:
2Na + MgF2 → 2NaF + Mg
Explanation:
Find the simple interest on a $22,000 principal, deposited for 4 years at a rate of 4.25%
The simple interest is equal to $3740 on a principal of $ 22,000, deposited for 4 years at a rate of 4.25 %.
What is simple interest?Simple interest can be based on the principal of a loan. Simple interest does not compound, a creditor only pays interest on the principal amount and a borrower never has to pay more interest on the previous interest.
Simple Interest (S.I.) can be described as the method of determining the interest amount for a principal of money at the rate of interest.
To determine simple interest, multiply the principal by the interest rate and the time.
Simple Interest = Principal ×Rate × Time
Given, the principal amount, P =$ 22000
The rate, R = 4.25%
Time, T = 4 years
The simple interest can be calculated as:
[tex]\displaystyle S.I. =\frac{P\times R\times T}{100}[/tex]
[tex]\displaystyle S.I. =\frac{22000\times 4.25\times 4}{100}[/tex]
Simple interest = $ 3740
Therefore, the simple interest is equal to $ 3740.
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Determine the number of ions produced in the dissociation of the compound listed. CaCl2
Answer:
See the explanation below, please.
Explanation:
Then the dissociation of the compound CaCl2 (Calcium chloride):
CaCl2 ---> Ca 2+ + 2Cl -
The compound dissociates into Ca2 + and Chloride (Cl-)
(two ions are generated in dissociation)
Answer:
The answer is 2 ions
Explanation:
A(n) ___chemical equation has the same number of atoms of each element on both sides.
false
balanced
imbalanced
physical
Answer:
A balanced chemical equation has the same number of atoms of each element on both sides.
Explanation:
This is because of the Law of Conservation of Mass. Therefore, valid chemical equations need to be balanced, in other words, to have the same number of atoms of each element on both sides.
Which of these statements is true?
A. Chemical energy is a form of potential energy.
B. Chemical energy is a form of nuclear energy.
C. Chemical energy is associated with moving electrons.
D. Chemical energy is associated with molecular motion.
if 20.0 g of magnesium react with excess Hydro chloric acid how many grams of magnesium chloride will be produced
Answer:
78.9g
Explanation:
To find the mass of magnesium chloride produced, convert 20.0 g of magnesium to moles, use the reaction's stoichiometry to get the moles of magnesium chloride, and then convert back to grams. The balanced chemical equation for the reaction is Mg(s) + 2 HCl(aq) → MgCl₂(aq) + H₂(g), and the result is 78.33 grams of magnesium chloride.
Explanation:To find out how many grams of magnesium chloride will be produced when 20.0 g of magnesium react with excess hydrochloric acid, we first need to consider the balanced chemical equation for the reaction:
Mg(s) + 2 HCl(aq) → MgCl₂(aq) + H₂(g)
From the balanced equation, we see that one mole of magnesium (Mg) reacts with two moles of hydrochloric acid (HCl) to produce one mole of magnesium chloride (MgCl₂) and one mole of hydrogen gas (H₂). To determine the mass of magnesium chloride produced, use the molar mass of magnesium (24.31 g/mol) to convert the mass of magnesium into moles, then use the stoichiometry of the reaction to find the corresponding moles of magnesium chloride produced.
The molar mass of magnesium chloride (MgCl₂) is 95.21 g/mol. After calculating the moles of Mg, that amount will be directly equal to the moles of MgCl₂ formed, since the ratio is 1:1. Finally, convert the moles of magnesium chloride to grams using its molar mass.
The calculation steps are as follows:
Determine moles of Mg: 20.0 g Mg × (1 mol Mg / 24.31 g Mg) = 0.8225 mol MgAccording to the reaction stoichiometry, moles of MgCl₂ produced = moles of Mg reacted = 0.8225 mol MgCl₂Determine the mass of MgCl₂: 0.8225 mol MgCl₂ × (95.21 g MgCl₂ / 1 mol MgCl₂) = 78.33 g MgCl₂Therefore, 78.33 grams of magnesium chloride will be produced when 20.0 g of magnesium reacts with excess hydrochloric acid.
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In an experiment, 9 g of aluminum react with 8 g of sulfur to form aluminum sulfide. Calculate the grams of aluminum sulfide formed. Al + S → Al2S3
Answer:
The grams of aluminum sulfide formed are ; 12.51 g
Explanation:
Using Formula,
[tex]mole = \frac{given\ mass}{Molar\ mass}[/tex]
Calculate the moles of Al and S :
Given mass of Al = 9 g
Molar mass of Al = 27 g/ mole
[tex]mole = \frac{9}{27}[/tex]
Mole of Al = 0.33
Given mass of S = 8 g
Molar mass of S = 32 g/mole
[tex]mole = \frac{8}{32}[/tex]
Mole of S = 0.25
The balanced chemical equation for the reaction between aluminium and sulfur is :
[tex]2Al(s) + 3S(s)\rightarrow Al_{2}S_{3}(s)[/tex]
Here ,
2 mole of Al needs 3 moles of S
1 mole of Al needs 3/2(= 1.5) moles of S
hence ,
0.33 mole of Al should require
[tex]\frac{3}{2}\times 0.33[/tex] moles of S
Sulfur needed = 0.495 mole
Available S = 0.25 mole
So there is less sulfur than required , S is the limiting reagent
Amount of S decide the Amount of Al2S3 formed
3 mole of S produce 1 mole of Al2S3
1 mole of S produce 1/3 mole of Al2S3
0.25 mole will produce :
[tex]0.25\times\frac{1}{3}[/tex]
= 0.0833 moles of Al2S3
[tex]Al_{2}S_{3}[/tex] = 0.083 mole
Molar mass of
[tex]Al_{2}S_{3}[/tex] = 150.16 g/mole
[tex]mole = \frac{given\ mass}{Molar\ mass}[/tex]
[tex]given\ mass = moles\times molar\ mass[/tex]
[tex]given\ mass = 0.083\times 150.16[/tex]
= 12.51 g
why are metals conductive?
Answer:
High density, metallic bonds
Explanation:
We may look at this question from the structural properties of the metals:
metals in their solid states are the most dense phases of all the standard phases we know (solids, liquids and gases). This means the particles within a metal lattice are very closely packed. Both heat and electricity is conducted when particles interact and touch one another, so that either energy or electric current might travel from one particle to the other easily. High density means low distances between the atoms, so they can interact easily;the main reason, however, is the fact that metals form metallic bonds, also known as 'sea of electrons'. We have metal cations floating in a sea of their valence electrons. This forms a medium in which both heat and electricity can travel easily.What will be kept the same (control) in the test?
The control variable is the one that is kept same in the test an throughout the test
Explanation:
The scientific constant that is kept constant throughout the experiment is not changed and the value remains constant throughout the experiment and they have strong influence in the results
To test the relationship between the dependent and the independent variables determination of the control variable is necessary and the resulting value changes if the control variables are not kept constant throughout the experiment
This will also bring about the co relationship between dependent variable and the independent variable