chemical changes (seneca) Flashcards
Acids are substances that —– when they dissolve in water (aqueous solutions).
form hydrogen (H+) ions
Acids are substances that form hydrogen (H+) ions when they …
dissolve in water (aqueous solutions).
Alkalis are substances that form —— when they dissolve in water (aqueous solutions).
hydroxide (OH-) ions
Alkalis are substances that form hydroxide (OH-) ions when
they dissolve in water (aqueous solutions)
The pH scale is used to measure …
how acidic or alkaline a substance is.
Acids and alkalis are on the opposite ends of the ——. They combine to form —— , which is…
pH scale
water
neutral.
hydrogen ion+hydroxide ion=
water
——- ion+——- ion=water
hydrogen
hydroxide
An oxidation reaction involves gaining …
oxygen
Oxidation reactions can also involve losing…
electrons.
When metals react with oxygen, …
metal oxides are produced
A reduction reaction involves losing…
oxygen
A reduction reaction involves ——oxygen
losing
Oxidation reactions can also involve —- electrons.
losing
when metal oxides lose oxygen,
they return to their atomic form
A mnemonic (memory aid) for remembering what happens to electrons during oxidation and reduction reactions is
OIL RIG
Metals reacting with oxygen to form metal oxides is an example of
an oxidation reaction
When reacting with other substances, metal atoms always form …
positive ions.
The reactivity of a metal is linked to …
how easy it is for a metal to form its positive ion.
highly unreactive metals are found in …
the Earth’s crust as pure metals.
highly unreactive,pure metals that are found in the Earth’s crust are also called
native metals.
A metal can only displace another metal from a compound if
it is located above it in the reactivity series.
1 reactive substances can displace (replace) 2 reactive substances from compounds.
1.More
2.less
what does spectator ions mean?
ions that are unchanged in the reaction