chemistry review

​Chemistry

​Elements

• On the periodic table

• Made up of only 1 type of atom

• Simplest substances: cannot be broken down.

​Compounds

• Made up of 2 or more ​different elements, chemically combined

• New substance formed​. Elements lose their characteristics and get new ones.

• Example:

  • Na +​ Cl = NaCl (salt)

​Molecules

• Two or more elements that are chemically bonded

  **can be ​2 of the same elements**

• All compounds are molecules but not all molecules are compounds​

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Some text here about the topic of discussion

Multiple Choice

Which of the following is an element?

• NaCl

• Fe

• $$CO_2$$  

• $$H_2O$$  

Multiple Choice

Which of the following is a compound?

• Na

• $$C_6H_{12}O_6$$  

• Pb

• Fe

Multiple Choice

Is this a compound, molecule, or both?

$$H_2O$$  

• compound

• Molecule

• Both

Multiple Choice

Is this a compound, molecule, or both?

$$H_2$$  

• compound

• molecule

• both

​Mixtures

• 2 or more substances only physically combined.

• They are not chemically bonded together

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​Types of Mixtures

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• Different parts are visible.

• Unevenly distributed​

​Heterogenous

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• No visible parts. Evenly Distributed

• Also called solutions

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​Homogenous

Open Ended

Give an example of a homogenous mixture:

Open Ended

Give an example of a heterogenous mixture:

​Ways to separate mixtures:

​ 1. Filtration 5. Settling

2. Sorting

   6. Evaporating/Boiling

3. Sieve

4. Magnet 7. Distillation

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Multiple Choice

How would you separate salt from water?

• Filter it

• use a sieve

• boil/evaporate

• sorting

Multiple Choice

How would separate Iron from sand?

• Magnet

• sorting

• filter

• sieve

Multiple Choice

How would you separate sand and pebbles?

• boil it

• filter it

• sieve

• magnet

Multiple Choice

How would you separate oil and vinegar?

• Settling

• evaporation

• sorting

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• the part of a solution that does the dissolving.

• usually a liquid​

  Ex: water​

​Solvent

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• the part of a solution that dissolves

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Ex: salt​

​Solute

​Solute vs. Solvent