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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Compounds are not elements, rather they are formed from elements. A compound is a substance formed from the chemical combination of two or more elements.
As an instance, water (H2O) is a compound formed from the elements - hydrogen and oxygen. We can also correctly say that water is formed from hydrogen molecule and oxygen molecule respectively. This is true because both gases (hydrogen and oxygen) will always exist as molecules. To this end, reactive elements that exists as molecules at room temperature will also form compounds.
Note: Water is neither hydrogen nor oxygen, rather it is a compound formed from hydrogen and oxygen molecules in the ratio 2:1. This is shown in the equation below:
Once a compound is formed, it is very difficult to revert it to the constituent elements that formed it. As a result, the change that accompanies the formation of a compound is termed a chemical change.
Below are some reactions that show the formation of compounds from elements:
Na(s) + Cl(g) -> NaCl(s) - Formation of Sodium Chloride from the reaction between Sodium and Chlorine.
2Fe(s) + 3O2 -> Fe2O3(s) - Formation of Iron(III)oxide from the reaction between Iron and Oxygen.
C(s) + O2 -> CO2(g) - Formation of Carbon(IV)oxide from the reaction between Carbon and Oxygen.
An understanding on the characteristics of compounds will give you a clue towards comprehending what compounds really are.
Below are some Characteristics or Features of Compounds:
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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. Please read some interesting facts about gold here
Copper is the only metal that is naturally antibacterial. This is why you would see some children carry copper water bottles to school
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.
Please read on modification of Dalton's atomic theory here.
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