Physics - Elements and compounds

What is a compound?

a pure substance made up of two or more elements chemically bonded together.

What is a element?

A pure substance that cannot be broken into a smaller substance.

What is a mixture?

A mixture is when two or more substances are combined without chemical bonding taking place.

Are substances in a mixture mixed in any ratio?

Yes, substances in a mixture are mixed in any ratio

Is a new substance formed in mixture and can it be separated?

No new substances are formed and the mixture can still be seperated with physical methods like sifting, filtering and magnetic separation, ect.

What is a homogeneous mixture?

A homogeneous mixture is when the substances are the same in the mixture.

What is a heterogeneous mixture?

A heterogeneous mixture is when the substances in the mixture is different and can be separated easily.

What is a pure substance?

A pure substance is is a single substance it can be a single element or a single compound.

What is the properties of materials and explain them?

strength - the ability to withstand an applied force without breaking

thermal and electric conductivity - the ability to conduct heat and electrical current

Brittle - The ability to resist breaking or cracking when subjected to a force

mallebility - the ability to be deformed by hammering or rolling without cracking

ductility - the ability to be stretched into long wires without breaking

magnetic - the ability to be attracted by a magnet

density - the amount of mass per unit volume

melting point - is the tempreture at which the solid changes into a liquid

Salty water is an example of a mixture. How can salt be separated from water?

By boiling the water and allowing the water to evaporate leaving the salt behind

Salt and iron fillings are an example of a mixture. How salt be separated from iron fillings?

It can be seperated by drawing the iron fillings out off the mixture with a magnet.

What can a homogeneous be called and is it the same composition throughout?

It is the same composition throughout and it can also be called a solution.

Can a solution be a solid, liquid or gas?

Yes

What is a solvent?

It is the component that represents the largest amount, which is often a liquid.

What is a solute?

It is the component that dissolves in the solvent.

What is salt in water?

Salt is soluble.

What are some examples of a homogeneous mixture?

carbon dioxide in water, sugar in water, alcohol in water, water vapour in air

What are some examples of a hetrogeneous mixture?

oil in vinegar, pizza, bird feed

how are compounds formed?

When atoms react to one or more elements.

Do properties of a compound differ to the properties of an element?

Yes.

Can compounds only be separated into individual elements and how?

Yes, by chemical means.

What is the law of conservation of matter and what does it mean?

The law states that no matter can be gained or lost in a chemical reaction. This means that the amount of matter before the start of a chemical reaction (amount of reactants) equals the amount of matter at the end of the reactions (amount of products).