Topics in ChemistryLe Chatelier's Principle: Changes in Concentration and Pressure explained in Dynamic Equilibrium Chemical Equilibrium: Dynamic Equilibrium in Chemistry Static and Dynamic Equilibrium explained with their Differences Chemistry 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
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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Matter generally has two attributes. These are mass and space.
Recall that matter is defined as anything that has mass and occupy space.
Before we look into the physical properties of matter, it will be a great idea if we understood what physical properties really are.
Physical properties can be defined as those features or characteristics on matter that can be measured without changing the composition of the substance or matter (or what the matter is uniquely made of). For instance, the physical properties of iron will be attributed to those features that can be seen and measured on the iron provided it is yet to go through a chemical change; (that is, provided the iron hasn't changed into a new substance through a chemical reaction).
Examples of physical properties of iron (in the above instance) will include its color, density, mass, boiling point, melting points, malleability, ductility and so on.
Note: The change associated with the physical properties of matter are referred to a physical change.
Physical properties of matter can be put into 2. These are:
They refer to the physical properties of matter that can be measured.
Since the extensive physical properties of matter has to do with the amount (or quantity) of substances, they become a measurable factor as a result. For this reason, the extensive physical properties of matter will include measurable quantities like mole, mass, density and volume.
Note: Extensive physical properties will always have a Standard International (SI) unit since they are measurable.
They refer to the properties of matter that can't be measured, hence do not depend on the amount of substance. Examples are color, malleability, ductility, boiling point and melting point.
From the above explanations, the various physical properties of matter will include the following:
Note: Note the followings:
The solute in solubility can be a solid, liquid or gas.
The solvent in solubility is always a liquid (usually water).
The mixture of common salt (solute) in water (solvent) will result in the formation of a salt solution; and that's a physical change.
Mixtures can be separated through an appropriate separation technique. For instance, the above mixture can be separated through evaporation.
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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
Below are some facts about gold
It is the only metal that has a gold (golden) color.
Gold is present inside the earth crust in all the seven continents.
Pure gold is soft and very stretchable (It can even be stretched into threads).
The Latin name of Gold is aurum which means 'shining dawn'. For this reason, its chemical symbol is 'Au'.
Gold is a very good conductor of electricity. This is why it’s sometimes used in making USB and audio cables.
Gold is non toxic and can be eaten with food. It is sometimes added to desserts in some expensive restaurants.
The term Gold originated from an ancient English word 'geolu' which means yellow.
24karat gold is the purest gold element.
An acid is a substance that produces Hydrogen ions (H+) when dissolved in water (or when in the form of an aqueous solution).
Svante Arrhenius definition of Acid
An acid is a substance that donates a proton in a chemical reaction.
Brønsted Thomas Martin Lowry definition of Acid
An acid is a substance that accept an electron pair in a chemical reaction.
Gilbert Newton Lewis definition of Acid
Finally, Acids can also be also defined as substances that gives out hydronium ion (H3O+) when dissolved in water.
In summary, all acids will always contain the positive H+ (cation) and an anionic group in their formula. For instance, the acid HCl (Hydrogen Chloride) contains H+ as cation and Cl- as its anion.