Chemical Reactions
What is the process called when a substance combines with oxygen?
Hint: C
(Ans: Combustion)
What is the chemical symbol for Hydrogen?
(Ans: H)
Is wood a natural or synthetic material?
(Ans: Natural)
Are plastics made from polymers?
(Ans: Yes)
Are ceramics usually brittle or flexible?
(Ans: Brittle)
What is the name of the chemical reaction: acid + base → salt + water?
Hint : A
(Ans: Neutralization)
How many protons does Carbon have?
(Ans: 6)
What property makes metal good for building bridges?
Hint: S
(Ans: Strength)
Is a polymer made of small units or large units?
(Ans: Small units, called monomers)
What is the main ingredient used in making traditional ceramics?
(Ans: Clay)
In a chemical equation, what does the arrow (→) represent?
(Ans: Yields or produces)
Which element has the symbol 'Na'?
(Ans: Sodium)
What material is made by mixing sand, water, and cement?
(Ans: Concrete)
What is the natural polymer found in plants?
Hint: C
(Ans: Cellulose)
What material is added to concrete to make reinforced concrete?
(Ans: Steel rods or rebar)
What type of reaction is this: AB → A + B?
Hint: D*c**********n
Ans. Decomposition
What do atomic numbers represent?
Hint: No. of p****** in an atom
(Ans: Number of protons in an atom)
What is the main advantage of composite materials?
(Ans: They combine properties of two materials)
What makes thermoplastics different from thermosetting plastics?
(Ans: Thermoplastics can be remelted)
Why is reinforced concrete stronger than regular concrete?
(Ans: It combines the compressive strength of concrete and tensile strength of steel)
Balance this equation: __Al + __O₂ → __Al₂O₃
(Ans: 4Al + 3O₂ → 2Al₂O₃)
What element has the atomic number 26?
hint: it's a metal with 2+ and 3+ charge
(Ans: Iron)
Name a natural material that is a good electrical insulator.
(Ans: Rubber or wood)
Name the polymer used to make synthetic clothing like fleece.
Hint P********
(Ans: Polyester)
What property makes ceramics good for electrical insulators?
(Ans: They do not conduct electricity)