Explain why a solution can have many solutes, but only one solvent.
Answers
A solution is a homogenous mixture of substances with variable composition. The substance present in the major proportion is called the solvent, whereas the substance present in the minor proportion is called the solute. It is possible to have solutions composed of several solutes. The process of a solute dissolving in a solute is called dissolution.
Many common mixtures (like concrete) are heterogeneous —the components and properties of such mixtures are not distributed uniformly throughout their structures. Conversely, solutions are said to be homogeneous because they have uniform composition and properties. Solutions are intimate and random homogeneous mixtures of atomic-size chemical species, ions, or molecules.
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25. In the formula for a molecular compound, which atom generally comes first? You may wentto refer to a periodic table.
In which part of the Milky Way galaxy is our sun located?halo bulge center spiral
A 4,000 mL solution of AgNO3 contains 17.00 g of solute in water. Calculate the molar concentration of the solution.
What is the percentage of nitrogen in N2O
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Answer:
16.27 g of CaCO3 are produced upon reaction of 45 g CaCN2 and 45 g of H2O.
Explanation:
Ca(CN)2 + 3H2O → CaCO3 + 2 NH3
First of all, let's find out the limiting reactant.
Molar mass Ca(CN)2.
Molar mass H2O: 18 g/m
Moles of Ca(CN)2: mass / molar mass
45 g / 92.08 g/m = 0.488 moles
Moles of H2O: mass / molar mass
45g / 18g/m = 2.50 moles
This is my rule of three
1 mol of Ca(CN)2 needs 3 moles of H2O
2.5 moles of Ca(CN)2 needs (2.5 . 3) / 1 = 7.5 moles
I need 7.5 moles of water, but I only have 0.488. Obviously water is the limiting reactant; now we can work on it.
3 moles of water __ makes __ 1 mol of CaCO3
0.488 moles of water __ makes ___ (0.488 . 1) / 3 = 0.163 moles
Molar mass CaCO3 = 100.08 g/m
Molar mass . moles = mass
100.08 g/m . 0.163 moles = 16.27 g
Answers
Answer: Hydrogen, Nitrogen, Flourine, Oxygen, Iodine, Chlorine and Bromine
Explanation:
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Eleanor wants to show her class a comparison of melting rates between two different solids when heat is applied. A graph would be more suitable than a table to show her data because the she can see the trend line of the effects of melting than the table.
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Answer:
(a) 52.2 mL helium
(b) 18.0 g nitrogen
(c) 78.5 mg MSG
(d) 23,600,000 mm wavelength
(e) 0.00420 kg lead
Rounded the numbers to three nearest significant figures.
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2.0 moles are represented by 118g of cobalt.
What are moles?
A mole is defined as 6.02214076 ×of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
Moles = 2.0023757 = 2.0moles
Hence, 2.0 moles are represented by 118g of cobalt.
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n=118/58.93=2
Answer: 2 moles
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When lithium hydroxide pellets are added to a solution ofsulfuric acid, lithium sulfate and water are formed. The balanced chemical reaction is 2LiOH + H₂SO₄ → Li₂SO₄ + 2H₂O.
What is balanced chemical reaction ?
A chemical equation is said to be balanced if the quantity of each kind of atom in the reaction is the same on both the reactant and product sides. In a balanced chemical equation, the mass and the change are both equal.
Following the rule of conservation of mass requires that a chemical equation be balanced. The balance of a chemical equation is disregarded by the rule of conservation of mass. The law states that a chemical process cannot produce or destroy matter.
When lithium hydroxide pellets are added to a solution of sulfuric acid, lithium sulfate and water are produced.
Thus, The balanced chemical reaction is 2LiOH + H₂SO₄ → Li₂SO₄ + 2H₂O.
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Balance the equation:
Reactants:
Li = 1 • 2
O = 1 • 2 + 4
H = 1 • 2+ 2
S = 1
Products:
Li = 2
O = 4 + 1 • 2
H = 2 • 2
S = 1
Balanced Equation:
2LiOH + H2SO4 → Li2SO4 + 2H2O