Answer:
7 mL
Explanation:
To prepare a solution by dilution of another one, we can use the equation:
C1V1 = C2V2
where C is the concentration, V is the volume, 1 is the initial solution, and 2 the final solution. V represents the total volume. K₂CrO₄ dissolver by:
K₂CrO₄ → 2K⁺ + CrO₄⁻²
So, 1 mol of K₂CrO₄ results in 1 mol of CrO₄⁻², the in a solution of 8.75x10⁻⁴M of CrO₄⁻², it will be 8.75x10⁻⁴M of K₂CrO₄, so the volume of the stock solution will be:
1.25x10⁻³xV1 = 8.75x10⁻⁴x10
V1 = (8.75x10⁻³)/(1.25x10⁻³)
V1 = 7 mL
Answer:
It is called active transport when glucose is transported into the cell against its concentration gradient.
Explanation:
The cell must use energy to transport a substance against an electrochemical or concentration gradient. Active transport mechanisms spend energy in the form of ATP to maintain the correct concentrations of ions and molecules in living cells.
Answer:
compound machine
Explanation:
Answer:a
Explanation:
The correct answer is conduction
Answer:
Forward direction
Explanation:
The reaction quotient of an equilibrium reaction measures relative amounts of the products and the reactants present during the course of the reaction at particular point in the time.
Q < Kc , reaction will proceed in forward direction.
Q > Kc , reaction will proceed in backward direction.
Q = Kc , reaction at equilibrium.
It is the ratio of the concentration of the products and the reactants each raised to their stoichiometric coefficients. The concentration of the liquid and the gaseous species does not change and thus is not written in the expression.
Thus, for the reaction:
The expression is:
Given,
[Cl⁻] = 0.50 mol/L; [ClO₃⁻] = 0.32 mol/L; [ClO⁻] = 0.24 mol/L
So,
Q = 5.7870
Since, Q < Kc ()
The reaction will go in forward direction.
Answer:
An atom accepts electrons and becomes an anion.
Explanation:
Atomic number = number of electrons = number of protons.
Atomic number of sodium is 11
So the atom contains 11 protons and 11 electrons
To find the number of neutrons we make use of the formula
Mass number - atomic number = number of neutrons
From the periodic table, we know mass number of sodium is 23
So number of neutron = 23 - 11 = 12.
When a sodium atom loses an electron it will have 11 positive protons and 10 negative electrons. Since 1 positive charge is more, Na becomes .
Positively charged ion is called as cation
Chlorine's atomic number is 17 so it has 17 protons and 17 electrons.
When it gains an electrons, it will have 17 positive protons and 18 negative electrons. Since 1 negative charge is more, Cl becomes .
Negatively charged ion is called as anion.
Answer:
2.5 M
Explanation:
To address this question, we can use the dilution formula:
M1V1= M2V2
Where M1 is the concentration of the concentrated solution
V1 is the volume of the concentrated solution (the amount of mL that we take from the initial solution)
M2 is the concentration of the diluted solution
V2 is the volume of the diluted solution or the final volume.
For this case, we know V1, M2 and V2 and we want to know M1.
Following the formula, M1=
Therefore, M1 =
For this, the concentration of the original solution is 2.5 M.
I hope this clarifies your inquiry.
Answer:
1. The frequency of green light that has a wavelength of the
2. Wavelength of infrared radiation with frequency
3. Energy of a photon with frequency
4. The energy of a photon having a wavelength of
5. Wavelength of ultraviolet radiation having
Explanation:
The equation connecting wavelength, frequency and speed of electromagnetic radiation is
c=ϑλ
1. λ =
ϑ = c/λ =
2. ϑ =
λ= c/ϑ
3. E = h ϑ
4. E= hc/λ
5. E=
λ= hc/E
Answer:
Option 6 ) Neutralization
Explanation:
For this case, the missing coefficient would be a "6" before the H₂O, within final products (right side of the equiation), hence, the final reaction should be:
2H₃PO₄ + 3Ba(OH)₂ ------> Ba₃(PO₄)₂ + 6H₂O
You should have in mind that the amount of atoms at each side of the chemical equation should be the same, so as to comply with the principle of mass conservation. If you add "6" on the left side of the H₂O, the equation will be balanced (for each side, lef and right, you will have: 12H, 2P, 14O and 3Ba)
Lastly, this is a chemical neutralization reaction, where an acid (H₃PO₄) is reacting with a base (Ba(OH)₂) in order to finally obtain a neutral salt (Ba₃(PO₄)₂) and water (H₂O)
Answer:
6; Neutralization
Explanation:
(Unbalanced)
Balancing is making the number of atoms of each element same on both the sides (reactant and product side).
To find the number of atoms of each element we multiply coefficient and the subscript
For example contains
5 × 1 = 5 ,Ca atoms and
5 × 2 = 10, Cl atoms
If there is a bracket in the chemical formula
For example we multiply coefficient × subscript × number outside the bracket to find the number of atoms
(Please note: 3 is the coefficient, and if there is no number given then 1 will be the coefficient )
So
3 × 3 = 9 , Ca atoms
3 × 1 × 2 = 6, P atoms
3 × 4 × 2 = 24, O atoms are present
Reactant side Number of atoms or groups Product side
of each element
3 Ba 3
2 2
12 H 2
6 O (Exclude O of ) 1
To balance H and O, multiply by 6 so we have
Reactant side Number of atoms or groups Product side
of each element
3 Ba 3
2 2
12 H 12
6 O (Exclude O of ) 6
Balanced!!!!
Acid and base reacts to form salt and water is called a neutralization reaction.
Answer:
3; Double Displacement
Explanation:
Balancing is making the number of atoms of each element same on both the sides (reactant and product side).
To find the number of atoms of each element we multiply coefficient and the subscript
For example contains
5 × 1 = 5 ,Ca atoms and
5 × 2 = 10, Cl atoms
If there is a bracket in the chemical formula
For example we multiply coefficient × subscript × number outside the bracket to find the number of atoms
(Please note: 3 is the coefficient, and if there is no number given then 1 will be the coefficient )
So
3 × 3 = 9 , Ca atoms
3 × 1 × 2 = 6, P atoms
3 × 4 × 2 = 24, O atoms are present
Let us balance the equation given
(UNBALANCED)
Reactant side Number of atoms or groups Product side
of each element
3 Ca 1
2 N 2
12 H 8
6 O 2
Multiplying on the right side by 3, we will have
Reactant side Number of atoms or groups Product side
of each element
3 Ca 3
2 N 2
12 H 12
6 O 6
Balanced!!!!
3: double displacement
Ions can be made by single element or covalently bonded group of elements. The covalently bonded group of elements is called polyatomic ions or polyatomic atoms. Therefore, C⁴⁻ is the largest among all.
Any species that contain charge whether it is positive charge or negative charge is called ions. The example of polyatomic ions are sulfate, phosphate, nitrate etc.
Cation is the species that loose electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral. Size of cation is always smaller than anion. So, C⁴⁻ is the largest among all.
Therefore, C⁴⁻ is the largest among all.
To learn more about ions, here:
#SPJ3
Answer:
Bi3+ has 103
C4- has 170
Li+ 76
Na+102
Cl-185