science 8.1

physical properties of a substance

color ,state, temperature boiling/melting, size heavy/light

physical properties of iron fe

grey,solid,1538 mp,heavy

physical properties of hydrochloric acid

colourless liquid

chemical properties of a substance

-how acidic or alkaline

-how it reacts with water acid/metal

-how readily it reacts

chemical properties of fe

fe+s- fes iron sulfide

fe+o feo iron oxide

chemical properties of HCL

PH-2

different

chemical changes and physical changes

physical change

no new substance

chemical change

new substance

iron+sulfer iron sulfide

chemical reaction taken place

-iron atom and sulfer atom combined bond

some chemical reactions

substances break apartt to make new substances

ex, water split apart o2 and h

chemical reaction happen everywhere

-happen inside plants when they grow and when they decay.

-happen inside your body to keep us alive, when u digest food

burning

-chemical reaction

-substances burn, react with oxygen and formed ash and contain new substance called oxide

charcoal

-made up of element called carbon

-carbon burn and combine with oxygen to make carbon dioxide

magnesium

when magnesium is burnt white powder are formed called magnesium oxide and is a new substance

Magnesium

-Element

-solid

-soft,shiny,malleable

-conducts electricity

-Melting point 651 Celsius

Oxygen

Element

Gas

Colorless,no smell

Don’t conduct electricity

-214 MP

Magnesium oxide

Compound

Solid

White,powdery

Doesn’t conduct electricity

Mp 2800

Reacting with water

-some substance react very violently with water

-some substances do not react with water at all.

Physical property of potassium

Very soft and can be cut with a knife

Chemical property of potassium

Potassium is so reactive that it has to be stored under oil to prevent it reacting with the water vapor in the air.

Explain reaction of potassium and water

The reaction produces so much heat that the gas burns

Magnesium placed in hydrochloric acid

-bubbles of gas are given off

-the magnesium has reacted with the hydrochkoric acid and formed new substances.

-Gas is hydrogen and MAGNESIUM CHLORIDE has been formed

-chemical property of magnesium

Bubbles forming in a reaction

Gas is being produced

Cannot tell what type of gas it is

Hydrogen is. Than air

Lighter

When hydrogen pops it is reacting with oxygen in the air to form

Water