What is true about the substances in a mixture?
Mixtures are physically combined structures that can be separated into their original components. A chemical substance is composed of one type of atom or molecule. A mixture is composed of different types of atoms or molecules that are not chemically bonded.
Which statement is true about the substances present in a mixture they always consist of the same element?
They always consist of the same element. They are always in the same state of matter. They can be separated by physical methods. They can only be separated by chemical methods.
Do mixtures lose or retain their identities?
In a compound the (atoms/molecules) are (chemically/physically) combined so that the elements that make up the compound (retain/lose) their identities and (do/do not) take on a new set of properties. In a mixture, the substances (lose/retain) their identities.
Can the composition of a mixture be changed?
A compound always contains two or more elements in a fixed proportion. How do mixtures differ from pure substances? The properties of a mixture can vary because the composition of the mixture is not fixed.
What is the chemical formula of glucose?
What can dissolve glucose?
What happens if glucose and water are mixed?
When you stir a spoonful of sugar into a glass of water, you are forming a solution. This type of liquid solution is composed of a solid solute, which is the sugar, and a liquid solvent, which is the water. As the sugar molecules spread evenly throughout the water, the sugar dissolves.
What happens to oil when mixed with water?
So what happens when you try to mix oil and water? The water molecules attract each other, and the oil molecules stick together. That causes oil and water to form two separate layers. Water molecules pack closer together, so they sink to the bottom, leaving oil sitting on top of the water.
What happen when salt and water were combined?
When salt is mixed with water, the salt dissolves because the covalent bonds of water are stronger than the ionic bonds in the salt molecules. Once this happens, the salt is dissolved, resulting in a homogeneous solution.
Why does glucose not dissociate in water?
1 Answer. Glucose does not dissociate into ions. Because Glucose (C6H12O6) has only covalent bond and absence of ionic bond. It is dissolve in water due to dipole – dipole interaction of OH bond between glucose and water.
Does KCl dissociate in water?
Ionic Electrolytes The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water. Figure 11.2. 2: As potassium chloride (KCl) dissolves in water, the ions are hydrated.
Can methanol conduct electricity?
In reality, a solution of methanol and water does conduct electricity, just to a MUCH lower extent than a solution of HCl in water. The self-ionisation constant of methanol will be very low, it will be only marginally different to that of water (which is about 10−14 .