Purity and formulations Flashcards
What does a pure substance mean in chemistry ?
A pure substance is something that only contains one compound or element throughout- not mixed with anything else.
What does the boiling or melting point tell you about a pure substance ?
It will tell you how pure the substance is.
True or false : A chemically put substance will melt or boil
at a specific temperature.
True
How do you test the purity of a sample ?
By measuring its melting or boiling point and comparing it with the meting or boiling point of the pure substance.
What will impurities in samples do ?
Lower the melting point and increase the melting range of your substance.
Impurities in your sample will also increase the boiling point and may result in your sample at a range of temperatures.
What are formulations?
Formulations are useful mixtures with a revised purpose that are made by following a formula.
What is the similarities for each component in a formulation?
Present in a measured quantity, and contributes to the properties of the formulation so that it meets its require function.
What is the example of a formulation ?
Paints, paints are composed of pigment- give the paint colour, Solvent- used to dissolve the other components and alter viscosity, Binder- forms a film that hold the pigment in place after it’s been painted on, additives-
adding to further change the physical and chemical properties of the paint.
Where and why are formulations important ?
Formulations are really important in the pharmaceutical industry.
For example, by altering the formulation of a pill, chemists can make sure it delivers the drug to the correct part of the body at the right concentration, that it’s consumable and has a long enough shelf life.
Where are formulations found in everyday life?
Cleaning products, fuels, cosmetics, fertilisers, metal alloys and even food and drink.
When you buys a product it might have information about its composition on the packaging. What is an example of this?
For example, the ration or percentage of each component. This tells you the product’s formulation. It also lets you choose a formulation with the right composition form your particular use.
