Metal Properties
We have two categories of properties; which category describes properties that can be observed or measured without forming a new substance?
Physical property
Rusting is the corrosion of this metal only
Iron
Reactive metals produce this gas when reacting with water
Hydrogen
The pH of acids is lower or higher than 7?
Lower
A metal mixed with other elements is called an _____
Alloy
Metals can transfer heat and electricity; what word do we use to describe this property?
Rusting needs oxygen and this other substance
Water
Metals high in the reactivity series react with water very quickly OR slowly
quickly
Metal + acid → salt + _____
Hydrogen
Does a pure substance melt at a fixed temperature or over a range?
Fixed temperature
This property allows metals to be bent or hammered into shape
Malleable
Corrosion is an example of a chemical reaction with oxygen. What is this type of reaction called?
Oxidation
The positive test for hydrogen gas is _____?
Squeaky pop when lit splint brought to the hydrogen gas
The bubbling seen during a metal + acid reaction is called ______
Effervescence
Steel is an alloy of iron and _____?
Carbon
When a metal reacts with oxygen, this type of compound is formed
Metal oxide
What is the name of the layer that forms on metals that protects them from corrosion?
Oxide layer / oxidative layer
General reaction: metal + water → ________ + hydrogen gas
metal hydroxide
Hydrochloric acid forms salts ending in this name
...chloride
If a metallic substance melts between 1400°C and 1450°C, it is most likely a ______?
Alloy
This substance speeds up a reaction without being changed or used up
Catalyst
Barrier methods work by blocking _____ and _____ so metal cannot corrode
water and oxygen
Which is the most reactive alkali in the reactivity series in your book?
Potassium
Why do we filter the solution when making a soluble salt?
To remove the excess metal
Explain (using a particle model) why alloys are stronger
In an alloy: different-sized atoms disrupt/distort the layers and stop them from sliding easily
This makes the alloy stronger and harder