Composition of Matter and Separation Techniques

What happens when pure substances are mixed together?

• They chemically change

• They become new substances

• They retain the same properties

• They explode.

Tags

NGSS.MS-PS1-2

Which method is used to separate solids based on particle size?

• Filtration

• Sieving or Hand-picking

• Distillation

• Evaporation

How can magnetic solids be separated from non-magnetic materials?

• Using a sieve

• Using a magnet

• Using a filter

• Using a funnel

Tags

NGSS.MS-PS2-3

Which method is used to separate soluble solids from a liquid?

• Filtration

• Evaporation

• Sieving

• Magnetism

How can insoluble liquids be separated by density?

• Using a magnet

• Pouring the less dense liquid from the top

• Using a filter

• Boiling the liquid.

Which of the following is true about mixtures?

• Made of just one kind of chemical

• Each component maintains its own set of properties

• Cannot be separated by physical means

• Represented by chemical symbols.

Heterogeneous mixtures are:

• Evenly mixed so you cannot see the different substances

• Made of just one kind of chemical

• Unevenly mixed so you can see the different substances

• Represented by chemical formula using element symbols.

What distinguishes compounds from elements?

• Compounds are made of just one kind of chemical

• Compounds can be separated by physical means

• Compounds are molecules made from two or more different elements

• Compounds are represented by chemical symbols from the Periodic Table.

Tags

NGSS.MS-PS1-1

What is an example of a homogeneous mixture?

• A mixture where you can see the different substances

• A liquid mixture of a solute dissolved into a liquid solvent

• A substance that cannot be broken down into simpler substances

• A molecule made from two or more different elements.

Elements are represented by:

• A) Chemical formula using element symbols

• B) Chemical symbols from the Periodic Table

• C) Scientific Names

• D) Ball-and-stick models