7: Chem Terms Flashcards
Year 7: Chemistry terms and ideas (47 cards)
Define Matter
- Something that takes up space
- Something that has mass
- Something made of atoms
What is pure matter?
Pure matter is a substance made of only one substance
What is impure matter?
Impure Matter is a substance that is a combination of different substances, eg. A mixture.
What is an element?
An element is a substance made of only one type of atom
What is a molecule?
A molecule is a substance that is created from multiple elements.
What is a compound?
A compound is a type of molecule, but it is a combination of different elements.
What makes a mixture homogeneous ?
A mixture becomes homogenous when it is:
A) Uniform and does not refract light
B) Consists of a solvent and a solute
C) The Solute is so eagerly dispersed in the Solvent that it cannot be filtered
What makes a mixture heterogenous?
A mixture becomes heterogenous when it:
A) It refracts light
B) Requires constant movement to have particles suspended in another, otherwise sediment at the bottom will be formed.
C) Can be filtered
What is a sign of a physical change?
A physical change is a change that applies to the substance itself. It can be measured, or observed.
It is easily reversible. It can be physical when:
It is a change of state,
It is a change in size or shape..
What is a sign of a chemical change?
A chemical change involves the changing of a substances chemical identity. They are not easily reversible. It can be chemical when: Gas is released Light or Heat is formed A new colour occurs A new smell or sound occurs.
What is a solute?
A solute is something that gets dissolved.
What is a solvent?
A solvent dissolves a solute.
What is a solution?
A solution is a mixture that consists of a solute and solvent, cannot be filtered and is homogenous.
Define dissolve.
The process of a solute becoming evenly dispersed and thus becoming un-filterable in a solvent.
What does soluble mean?
Soluble means that two i subsets aces are able to be dissolved/dissolve the other.
What dies insoluble mean?
Insolvable means that two substances cannot dissolve/be dissolved in another.
In a solution of sugar and water- which of the two is the solvent?
The water.
Briefly define the process of Sieving.
Seiving involves separating a heterogenous mixture by putting the mixture through small holes of a mesh device. By shaking the device back and forth, the larger particles are trapped and unable to ass through the device, while the finer once’s can pass through nicely.
Briefly Define the process of Decanting.
Decanting involves allowing a suspensions larger particles to form sediment at the bottom, and then pouring the liquid component out of whatever was holding the mixture. The sediment is left behind.
Briefly Define the process of Sedimentation.
Sedimentation is a technique send on suspensions where the larger particles are left to form sediment at the bottom. The remaining can substance can be removed.
Briefly Define the process of Filtration.
Filtration is a technique that relies on the larger particles of a suspension not being able to pass through a concise filter. The finer substance can pass through the filter funnel, which is a small type lined with filter paper.
Briefly Define the process of Magnetic Separation.
Magnetic separation relays on separating a substance based on its attractiveness to magnets. If a substance is magnetic it can be pulled form the other substance(s) because they are not attracted.
Briefly Define the process of Chromatography.
Chromatography is a separation that relies on separating substances based on the difference of rates or ‘speed’ between the substances. It requires a medium that particles can climb up.
Briefly Define the process of Distillation.
Distillation is a separation technique that separates substances based on a difference of boiling points for two liquids. It requires a distillation apparatus that boils a combination of liquids allowing the gas form of one to rise into a condenser and then be cooled to become liquid again.
