Topics in ChemistryChemistry Scheme of Work, SS1, First Term Chemistry Scheme of Work, SS1, Second Term Chemistry Scheme of Work, SS1, Third Term Compounds in Chemistry: Characteristics of Compounds Types of Mixture: Homogenous and Heterogeneous Mixtures Mixtures: Characteristics of Mixtures Physical Properties of Matter explained with Examples Chemical Properties of Matter explained with Examples Differences between Physical and Chemical Change Ionic Theory and Electrolysis Physical and Chemical Properties of Acids States of Matter: Characteristics of Solids Liquid State of Matter: Characteristics of Liquids Gaseous State of Matter: Characteristics of Gases Molar Mass, Worked Examples and Differences with Molecular Mass Elements: Characteristics of Elements Salts and Types of Salt in Chemistry Mixtures and Separation of Mixtures Mixtures and Separation of Mixtures - part 2 Mixtures and Separation of Mixtures - part 3
Academic Questions in Chemistry
The Separating Funnel is a technique used in the separation of mixtures. Another name for Separating Funnel is the _____ Funnel.
2NH4+(aq) + Ag+(aq) -> 2H4AgN
The equation above represents _____ acid.
A. Svante Arrhenius'
C. Gilbert Lewis'
E. Sir Isaac Newton's
F. Albert Einstein's
According to Brønsted Thomas Martin Lowry, an acid is defined as _____.
A. Any substance that produces hydrogen ion (H+) when dissolved in water
B. A substance that accepts electron pair in a chemical reaction
C. A substance that gives out hydronium ion (H3O+) when dissolved in water
D. A substance that donates a proton in a chemical reaction
E. A substance that reacts with a base to form salt and water
F. A substance whose hydrogen ions (H+) are displaced after a reaction with metals higher in the activity, reactivity or electrochemical series
Which of the following is NOT a characteristic of chemical change?
Which of the following statement is FALSE concerning a physical change _____.
The following substances will sublime EXCEPT _____.
Which of the following is a state of matter?
The ideal way of separating a mixture of blood is through _____.
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A mixture can be generally categorized into 2 types. These are:
The prefix homo means sameness. A mixture is considered to be homogeneous when it has a uniform composition and appearance all through. For instance, the mixture of salt and water (saline) is a homogeneous mixture because the salt dissolves completely in water.
Note: The liquid forms of homogenous mixtures whose particles are completely dissolved are referred to as solutions. The solid to be dissolved in a solution is referred to as the solute while the liquid is termed the solvent. In short, the solvent dissolves the solute to form solution which is always a homogenous mixture.
The diagram below shows the homogenous mixture of a sugar solution:
In chemistry, a colloid is a homogeneous mixture with intermediate sized particles. It lies in the borderline between a solution and a suspension.
Although the solution of a homogeneous mixture appears to be physically pure, they are still impure because they are mixtures. Mixtures are not pure substances but elements are.
Other examples of homogenous mixtures include:
A mixture is said to be heterogeneous if it's composed of different substances that do not dissolve. The substances that make up a heterogeneous mixture are often visible to the eye.
A suspension is a heterogeneous mixture comprising of large sized particles. The particles can be seen to settle down or sediment below the liquid. An instance of suspension is a mixture of water and sand. This suspension (mixture) can be separated via a technique termed sedimentation and decantation. The image below illustrates this:
Examples of heterogeneous mixtures include:
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Alfred Ajibola is a Medical Biochemist, a passionate Academician with over 7 years of experience, a Versatile Writer, a Web Developer, a Cisco Certified Network Associate and a Cisco CyberOps Associate.
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Amazing facts in Chemistry
The only letters that failed to appear on the periodic table are letters:
Gold and copper are the only two non-silvery colored metals.
Copper is the only metal that is naturally antibacterial. This is why you would see some children utilize 'copper' water bottles in schools
Water actually freezes faster when it’s warm than when it’s cold
Most element in their pure state exists physically in different forms. For instance, pure carbon can exist as both diamond and graphite. This phenomenon is called allotropy.
If you pour a handful of salt into a full glass of water, the water level will go down rather than overflowing the glass.
Similarly, if you mix half liter of water and half litre of alcohol, the total volume of the liquid will be les than one litre
NOTABLE POINTS IN Chemistry