Chemical Analysis Flashcards
What is Chemical Analysis?
The use of instruments and methods to separate, identify, and quantify substances
What is a Pure Substance?
Single element or compound that hasn’t been mixed with any other substances
What is an example of a Pure Substance
Distilled Water
What is a formulation?
Mixtures that have been prepared using a specific formula
How can you tell if a substance is pure?
They melt and boil at specific temperatures
What happens to the melting and boiling points of impure substances?
Impurities lower the melting point and raise the boiling point of a substance
What is the boiling point of pure water?
100°C
What is the melting point of pure sodium chloride?
801°C
What is a physical test in chemical analysis?
A test that examines the physical properties of a substance, such as its melting or boiling point
What is a chemical test?
A test where a substance reacts with another chemical to identify it
Give three examples of formulations
- Paints
- Medicines
- Fertilizers
What is the key feature of a formulation?
The components are always in the same proportions, contributing specific properties
Why do formulations require precise proportions?
To ensure they function as intended
E.g -
- Paint sticking to wall
- Medicine working effectively
Why is knowing the boiling point of a substance useful?
Can help identify unknown substances by comparing to reference data
What is the boiling point of salt water?
Around 100.5°C, depending on the salt concentration
