WorksheetsChemical composition – Chemical structure
Total questions: 34
Worksheet time: 20mins
What term describes a homogeneous mixture of two or more substances?
Suspension
Compound
Solution
Mixture
Which term refers to a mixture where particles are dispersed throughout but not dissolved in a fluid or solid?
Solution
Solubility
Compound
Suspension
What is the term for the ability of a substance to dissolve in a solvent?
Mixture
Compound
Suspension
Solubility
What do you call a substance made from two or more elements that are chemically bonded?
Solution
Suspension
Mixture
Compound
Which term is used to describe a material composed of two or more different substances that are not chemically combined?
Solution
Solubility
Compound
Mixture
Which two types of chemical structures will be considered in the Level 3 Engineering and Manufacturing course?
Colloids and dispersions
Gels and sols
Solutions and suspensions
Aerosols and emulsions
What is a solution in the context of chemistry?
A. A solid mixture of two or more substances
B. A heterogeneous mixture of two or more components
C. A homogeneous mixture of two or more components
D. A gas mixture of two or more components
What term is used to describe the dissolving agent in a solution?
A. Solute
B. Solvent
C. Solution
D. Solstice
What is the term for the substance that is dissolved in a solution?
A. Solvent
B. Solute
C. Solution
D. Solstice
What is the typical size of the components of a solution?
A. Larger than 10^-9 m in diameter
B. Smaller than 10^-6 m in diameter
C. Smaller than 10^-9 m in diameter
D. Larger than 10^-3 m in diameter
Which of the following is an example of a solution?
A. Oil and water
B. Sand and water
C. Sugar and water
D. Flour and water
What is solubility?
The ability of a solvent to become a gas
The degree to which a substance dissolves in a solvent to make a solution
The process of a solute becoming a solid
The temperature at which a solution becomes saturated
What is meant by a solution being "saturated"?
A solution that can dissolve more solute at a given temperature and pressure
A solution that has undissolved solute at the bottom
A solution in which no more solute can be dissolved at a given temperature and pressure
A solution that changes color when no more solute can be dissolved
Which term describes the complete solubility of one fluid in another?
Insoluble
Partial
Saturated
Miscible
What is an example of a miscible combination of fluids?
Oil and water
Methanol and water
Sand and water
Oil and vinegar
If oil and water are mixed, this is an example of what type of solubility?
Complete
Miscible
Saturated
Partial
What is the characteristic of the particles in suspensions compared to those in solutions?
The particles in suspensions are smaller.
The particles in suspensions are the same size.
The particles in suspensions are larger.
The particles in suspensions are gaseous.
How can the components of a suspension be distributed evenly?
By heating the suspension.
By allowing the suspension to stand still.
By shaking the suspension.
By passing electricity through the suspension.
What will eventually happen to the components in a suspension?
Which of the following is an example of a suspension?
Salt dissolved in water.
Sugar dissolved in tea.
Paints with dyes suspended in oil.
Carbon dioxide in soda.
What is a compound?
A) A mixture of two or more substances
B) A pure substance made from more than one element chemically bonded together
C) A single element in its natural state
D) A solution of two elements mixed physically
Why is it difficult to separate the elements in a compound?
A) Because they are mixed in a fixed ratio
B) Because they are physically mixed
C) Because they are chemically bonded together
D) Because they are in a gaseous state
What does it mean when it is said that the atoms of the elements in a compound bond together in a fixed ratio?
A) The compound cannot be broken down into simpler substances
B) The compound has a variable composition
C) The compound can be represented by a chemical formula
D) The compound is made of only one type of atom
What is the chemical formula for water?
A) CO
B) CO₂
C) H₂O
D) O₂
What is the chemical formula for carbon dioxide?
A) CO
B) CO₂
C) H₂O
D) O₂
What must occur for the elements in a compound to break apart during a chemical reaction?
A change in physical state
A change in temperature only
Electrolysis or thermal decomposition
A change in pressure only
What is the process of forming complex compounds from simpler ones or individual elements called?
Decomposition
Synthesis
Double replacement
Single replacement
Which of the following best describes what happens in a chemical reaction?
Only the physical state of compounds changes
Existing bonds are broken and new ones are formed
Elements in a compound are rearranged without breaking bonds
Compounds are only decomposed, not synthesized
What defines a mixture in the context of chemical substances?
A chemical reaction between two elements
A physical blend of two or more elements or compounds that are chemically bonded together
A physical blend of two or more elements or compounds that are not chemically bonded together
A compound with elements present in specific ratios
In a mixture, how are the substances present?
In specific amounts or ratios like in a compound
Randomly without any specific amounts or ratios
Always in equal proportions
In a fixed volume but variable composition
Which of the following is an example of a mixture?
Pure water (H2O)
Salt (NaCl)
A mixture of sand and water
Carbon dioxide (CO2)
Which physical process can be used to separate a mixture of sand and water?
Distillation
Magnetism
Filtration
Crystallisation
What can be used to separate a solution of salt and water?
Filtration
Magnet
Crystallisation or distillation
None of the above
How can a mixture of iron filings and sulphur powder be separated?
Filtration
Crystallisation
Distillation
Magnet
