elements,compounds and mixtures revision Flashcards
what is a compound
Two or more chemicals are combined together.
What is a molecule
A group of atoms combined together, representing the smallest fundamental unit of a chemical compound that can take part in chemical reaction.
Can elements be broken down into smaller substances
No, it can’t be broken down into smaller substances
Give 5 examples of a compound
Carbon dioxide, Sodium chloride, Hydrogen, oxygen
How did Mendeleev arrange the periodic table
Mendleev arranged the periodic table by there atomic mass
What do group one metals do when it reacts with water
When the metals reacts with water is, they produce an alkaline metal hydroxide solution and hydrogen. Reactivity increases down the group.
What observations can you see when the water reacts with metal
The metal will sizzle and it gets a lot hotter in the test
Write a definition of a chemical reaction
A process that involves rearrangement of the molecular or a iconic structure of a substance, as distinct from a change of in physical form or a nuclear reaction.
Name an example of a chemical reaction
An example of a chemical reaction is combustion (Burning)
What 3 things indicate a chemical reaction has been taken place
One of the things you need for a indication of a chemical reaction has happened is: colour size difference and smell
Give a definition of a physical change
A physical change is it is a irreversible to change
What is an anomalous result mean
Anomalous means there isn’t a pattern
Complete this equation:
Magnesium+ oxygen
Magnesium oxide
How are liquid and gases similar
You can make gases by evaporating water into gas and if you freeze gases it turns into water ( if you use water).
How are liquids and solids similar
You can melt solids to make water and you can freeze water into soilds.
