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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Have you wondered why a gas (let's say a cooking gas for instance) will suddenly fill a room as soon as it's released from it's container?
To answer the above question, the gas particles were already moving randomly while inside the gas cylinder. In fact, the particles were always waiting to escape as soon a tiny opening is made on whatever had been containing it.
From the above instance, we can categorically state that:
Note: Consider a particle to be the smallest part a anything. For instance, if you can pick up the smallest part of a finely grinded sugar, then such could be considered as a particle or an atom of the sugar.
Gases are made up of particles that are widely separated from one another.
An atom is defined as the smallest part (or particle) of a substance that can take part in a chemical reaction.
In reality, it is practically impossible to pick up a particle or an atom of a finely grinded substance; for example, table salt.
An understanding of matter, atoms and particles will aid you to better understand the states of matter.
Gases have their particles widely separated apart. For this reason, they are constantly moving (in a random motion); thus they have no definite shape at room temperature.
Gaseous particles are always considered to exhibit a random motion.
The image below shows the random motion exhibited by gaseous particles:
Structure of Gaseous Particles
From the above image, if you guessed that the atoms or particles of a gas are widely spread apart, then you are very correct.
The cohesive forces binding gaseous particles are non existent, thus they always keep moving. As a result of their constant motion, gases will always constitute the entire atmosphere.
Gases can be easily compressed. This means that the gaseous particles (or atoms) can be brought close to one another by the application of pressure.
Consider the instance below:
When you continuously fill a gas into a ballon, you will observe that the pressure of the gas inside the ballon becomes greater than what the ballon can hold.When the elastic limit of the ballon is reached, it bursts open; and the gases eventually escapes into the atmosphere.
When you fill a gas into a container; and allow such container to cool beyond a certain temperature (inside a freezer), the particles of the gas inside the container will become compressed to liquid and eventually to solids.
Do you know we can have liquid oxygen and solid carbon(IV)oxide?
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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