Chemistry Revision Flashcards
What does the symbol for Corrosive mean?
Burns and destroys materials and living tissues, including eyes and skin, on contact, e.g. sulfuric acid.
Also used for bleach, which can cause reddening or blistering of skin.
What does the symbol for Flammable mean?
Catches fire easily, e.g. petrol.
What does the symbol for Explosive mean?
Can cause explosions, e.g. hydrogen.
What does the symbol for Toxic mean?
Can cause death if inhaled, swallowed, or taken in through the skin, e.g. cyanide.
What does the symbol for Oxidizing mean?
Provides oxygen, which allows other materials to burn more easily, e.g. liquid oxygen.
What does the symbol for Deadly mean?
Deadly for aquatic environment.
What is the piece of equipment used to heat substances in a school laboratory?
The piece of equipment is called a Bunsen Burner.
What are the main parts of a Bunsen burner?
The main parts include the barrel, regulating collar, air hole, gas tubing, and base.
What safety precautions should you take when using a Bunsen burner?
Ensure proper safety precautions are followed, such as tying back long hair, wearing safety goggles, and ensuring the area is clear of flammable materials.
What happens when magnesium ribbon is heated?
Burns with a bright white light and forms white ash.
Example: Magnesium ribbon burns brightly when ignited.
What happens to ice when heated?
Changes from solid to liquid.
Example: Ice melts into water when heated.
What happens to candle wax when heated?
Heats, smells, and forms a runny liquid.
Example: Candle wax becomes liquid when melted.
What happens to copper carbonate when heated?
Changes from green to black.
Example: Heating copper carbonate results in a color change.
What happens to a wooden splint when heated?
Chars and forms a black ash.
Example: A wooden splint burns and leaves ash.
What happens to bread when heated?
Turns black, chars, and burns.
Example: Bread burns when exposed to high heat.
Is the change of magnesium ribbon heating reversible or irreversible?
Irreversible.
Is the change of ice melting reversible or irreversible?
Reversible.
Is the change of candle wax melting reversible or irreversible?
Reversible.
Is the change of copper carbonate heating reversible or irreversible?
Irreversible.
Is the change of wooden splint burning reversible or irreversible?
Irreversible.
Is the change of bread burning reversible or irreversible?
Irreversible.
What color flame indicates a complete combustion in a Bunsen burner?
Blue
True or False: A yellow flame from a Bunsen burner is a sign of complete combustion.
False
Fill in the blank: The ______ flame is often referred to as the safety flame.
yellow
What does a yellow flame in a Bunsen burner indicate about the fuel-to-air ratio?
It indicates a rich fuel-to-air ratio, leading to incomplete combustion.
Which color flame is produced when there is insufficient oxygen supply?
Yellow or orange
What is the process called when a solid turns into a liquid?
Melting
True or False: Evaporation is the process where a liquid changes into a gas at a temperature below its boiling point.
True
Fill in the blank: The change of state from gas to liquid is known as __________.
Condensation
Which of the following is NOT a change of state? A) Freezing B) Melting C) Mixing
C) Mixing
What term describes the change of state from liquid to gas at the boiling point?
Boiling
What is the definition of a reversible change?
A reversible change is a change that can be undone or reversed, returning to the original state.
True or False: Melting ice is an example of an irreversible change.
False
Fill in the blank: A chemical reaction that produces a gas is typically _____ (reversible/irreversible).
irreversible
Which of the following is an example of a reversible change? (A) Burning wood (B) Dissolving sugar in water (C) Rusting iron
B) Dissolving sugar in water
What distinguishes irreversible changes from reversible changes?
Irreversible changes result in new substances being formed that cannot be easily converted back to their original form.
