A metal typically is a hard, shiny and strong element that is able to conduct heat and electricity.
Iron is the most commonly used metal in the world in which we live, though not in its pure form. When iron is combined with a small amount of a non-metal like carbon we obtain an
alloy .
The
study of metals is known as
metallurgy .
Gold is generally regarded as a metal that symbolizes wealth and prosperity, while
platinum and
palladium are valuable because of their use in electronics and specialized engineering.
Steel is known everywhere and millions of tons of steel are used annually to manufacture items such as washing machines, cars, ships and trains.
Stainlesssteel is also used for cutlery. For this, it is made into an alloy with the use of hard, shiny
chromium .
A variety of substances can be added to iron to form
alloys , e.g. manganese, phosphorus, silicon and sulphur.
Aluminium , again, is used extensively for cold drink cans, ladders and objects that are required to be light and rust free. Aluminium is the third most common chemical element on earth as much of the earth’s crust is made up of it. Copper and magnesium are usually added to aluminium to make it suitable for industrial use.
Metals can be recycled successfully to protect our natural resources – the gold and silver used in electrical circuits (and in false teeth!), particularly.
Bronze – a mixture of copper and tin - is one of the most ancient of alloys.
Brass is an alloy of copper and zinc.
Class activity
Recognition of metals and non-metals
Identify as many substances as possible from the illustration and classify them as metals and non-metals according to the main element of their substance.
1. Which feature did you consider to determine whether substances were metals or non-metals?
2. Do you think the secretary is prosperous? Provide a reason for your answer?
3. Which substance is taking over from this metal in industry? From what is it made?
4. What is metallurgy?
5. What is steel?
6. The following are the distinctive features of metal. Write down the distinctive features for non-metals:
METALS
hard and shiny
pliable and malleable
conducts heat
conducts electricity
7. What is the difference between pliable and malleable?
Assessment of recognition
Were you able to do the classification correctly and to apply your knowledge?
The learner will know and be able to interpret and apply scientific, technological and environmental knowledge.
We know this when the learner
is able to categorise information;
2.4 is able to apply knowledge.
Memorandum
Metals:
Non-metals:
1. shiny, hard
2. gold
3. demand
4. study of metals
5. alloy
6. NON-METALS
Hard and shiny - Different colours; not very hard
Pliable and malleable - Brittle, breaks
Conducts heat – No
Conducts electricity - NO
7. Pliable – long threads stretched out.
Malleable – hammered into thin plates/sheets.
Questions & Answers
A golfer on a fairway is 70 m away from the green, which sits below the level of the fairway by 20 m. If the golfer hits the ball at an angle of 40° with an initial speed of 20 m/s, how close to the green does she come?
A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance
Chemistry is a branch of science that deals with the study of matter,it composition,it structure and the changes it undergoes
Adjei
please, I'm a physics student and I need help in physics
Adjanou
chemistry could also be understood like the sexual attraction/repulsion of the male and female elements. the reaction varies depending on the energy differences of each given gender. + masculine -female.
Pedro
A ball is thrown straight up.it passes a 2.0m high window 7.50 m off the ground on it path up and takes 1.30 s to go past the window.what was the ball initial velocity
2. A sled plus passenger with total mass 50 kg is pulled 20 m across the snow (0.20) at constant velocity by a force directed 25° above the horizontal. Calculate (a) the work of the applied force, (b) the work of friction, and (c) the total work.
you have been hired as an espert witness in a court case involving an automobile accident. the accident involved car A of mass 1500kg which crashed into stationary car B of mass 1100kg. the driver of car A applied his brakes 15 m before he skidded and crashed into car B. after the collision, car A s
can someone explain to me, an ignorant high school student, why the trend of the graph doesn't follow the fact that the higher frequency a sound wave is, the more power it is, hence, making me think the phons output would follow this general trend?
Nevermind i just realied that the graph is the phons output for a person with normal hearing and not just the phons output of the sound waves power, I should read the entire thing next time
Joseph
Follow up question, does anyone know where I can find a graph that accuretly depicts the actual relative "power" output of sound over its frequency instead of just humans hearing
Joseph
"Generation of electrical energy from sound energy | IEEE Conference Publication | IEEE Xplore" ***ieeexplore.ieee.org/document/7150687?reload=true
A string is 3.00 m long with a mass of 5.00 g. The string is held taut with a tension of 500.00 N applied to the string. A pulse is sent down the string. How long does it take the pulse to travel the 3.00 m of the string?
