metal + water/ steam reactions Flashcards
which metals are the least reactive on the reactivity series?
Au, Ag and Cu
which metals are middle on the reactivity series?
Pb, Fe and Zn
which metals are the most reactive on the reactivity series?
Al, Mg, Ca, Li, Na and K
metals react with cold water to form what?
metal hydroxide + hydrogen
word equation and chemical equation for the reaction between magnesium and water?
- magnesium + water -> magnesium hydroxide + hydrogen
- Mg + 2H20 -> Mg(OH)2 +H2
what observations are made with the reaction between magnesium and water?
-effervescence- hydrogen gas produced
-solid disappears- due to being used up in the reaction
how do alkali metals react with water?
violently to form metal hydroxides + hydrogen
word and chemical equation for the reaction between lithium and water?
- lithium + water -> lithium hydroxide + hydrogen
-Li + H20 -> LiOH + 1/2 H2
the reactions of Li, Na and K all have what observations?
- the solid floats
- effervescence
- the solid moves
- the solid disappears
what happens to the water if universal indicator is added afterwards?
it turns dark blue
why are metal hydroxides alkali?
they donate 0H-
why do the group 1 metals become more reactive as you go down the group?
- the atoms get bigger- have more electron shells
- the outer electron is further from the nucleus
- the attraction between the nucleus and the outer shell electron is weaker
- less energy is needed to break the attraction
metal + steam forms what?
metal oxide + hydrogen
the metal + steam reaction is usually conducted in what type of tube?
horizontal tube
why do metals react with cold water and hot steam to produce different products?
steam has more energy so both bonds in the water molecule can break
