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3 years ago

Solutions are always formed when:

2 answers:

6 0

The answer would be: a) one substance dissolves uniformly in another substance

The solution can be made from solid, liquid or even gas as long as they are dissolves uniformly in the solvent.
It's not mandatory that a solution is made from solid mixed in liquid. If a compound made that means there is a chemical reaction happens, and that is not related to the solution.

JulijaS [17]3 years ago

4 0

Answer:

a.One substance dissolves uniformly in another substance.

Explanation:

Solution: It is consist of solute and solvent.

Solute is present in solution in small quantity and solvent present in large quantity in comparison to solute.

When we dissolve solute completely in the solvent then the solution is formed.

Solute and solvent can not be separated by filtration.

It is homogeneous mixture of two or more substance.

a.One substance dissolves uniformly in another substance.

It is true because when we dissolve one substance uniformly in another substance .Then substance dissolve completely and form solution.

b.liquid are mixed together

It is not true because if we mix oil and water then they will not form homogeneous mixture.

c.a compound is created.

It is not true because when a compound is formed then it is not necessary that solution is always formed.

d.Solids and liquids are mixed together

It is not true when we mix stone and water then the mixture is not homogeneous.Therefore, it is false.

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Copper sulfate, when it is dissolved in water, has a blue color. When steel wool is mixed with a copper sulfate solution, the st

jenyasd209 [6]

Answer:

A. The color change from blue to green happens in nature.

Explanation:

The color change is an indicator of a chemical reaction that has occurred. Although color changes are not necessarily good diagnostic tool to measure if a chemical reaction has occurred or not.

In this reaction, color changes is quite an effective tool
Chemical changes usually involves the formation of a new product from the chemical reaction.
Also, the steps are not easily reversible.
For this reaction, color change is the most appropriate signal for a chemical change.

4 0

3 years ago

The heart is a large ________________ that pumps the blood throughout the body.

Irina-Kira [14]

Muscular organ that pumps blood throughout the body

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3 years ago

Calculate the molarity of a 10.0% (by mass) aqueous solution of hydrochloric acid.

olga2289 [7]

The question is incomplete,the complete question :

Calculate the molality of a 10.0% (by mass) aqueous solution of hydrochloric acid:

a) 0.274 m

b) 2.74 m

c) 3.05 m

d) 4.33 m

e) the density of the solution is needed to solve the problem

Answer:

The molality of a 10.0% (by mass) aqueous solution of hydrochloric acid is 3.05 mol/kg.

Explanation:

10.0% (by mass) aqueous solution of hydrochloric acid.

10 grams of HCl is present in 100 g of solution.

Mass of HCl = 10 g

Mass of solution = 100 g

Mass of solution = Mass of solute + Mass of water

Mass of water = 100 g - 10 g = 90 g

Moles of HCl = $\frac{10 g}{36.5 g/mol}=0.2740 mol$

Mass of water in kilograms = 0.090 kg

Molality = $\frac{0.2740 mol}{0.090 kg}=3.05 mol/kg$

The molality of a 10.0% (by mass) aqueous solution of hydrochloric acid is 3.05 mol/kg.

6 0

3 years ago

How does an atom differ from a molecule?

blagie [28]

Answer:

A molecule is a bunch of atoms combined.

An atom is the smallest part of an element, that you can get without splitting the nucleus of the atom.

Molecules are made of more two or more atoms joined together. The atoms can be same or different elements. A single molecule is the smallest piece of matter you can have without changing its properties.

Explanation:

5 0

4 years ago

Pls help 25 pts

mote1985 [20]

Answer:

In the quantum-mechanical model of an atom, electrons in the same atom that have the same principal quantum number (n) or principal energy level are said to occupy an electron shell of the atom. Orbitals define regions in space where you are likely to find electrons.

6 0

2 years ago