Chemistry 1 Flashcards
(40 cards)
How many electrons are allowed in each shell?
1st shell: 2, 2nd shell: 8, 3rd shell: 8
What are the elements in group 0 called?
The noble gases
Which number tells you the total number of protons and neutrons?
The mass number
What does the atomic number tell you?
The number of protons
How do you work out the number of neutrons?
Mass number - atomic number
What is a protons charge?
+1
What are charged atoms called?
ions
What is the word equation for making calcium hydroxide?
calcium + water = calcium hydroxide
What is calcium hydroxide used for?
to neutralize soil
How else can you find the mass number?
round the atomic weight to the nearest whole number
Give three reasons why it’s good to recycle metals
Reduces greenhouse gas emissions, aluminum and steel can be recycled over and over again, decreases environmental damage caused by mining
What is the name of the method where plants are used to extract metals from soil?
Phythomining
List two ways of reducing acid rain
produce energy without fossil fuels and use renewable energy
What’s the general formula for an alkane?
Cn H2n+2
Give three properties of metal
Strong, good conductors of heat, good conductors of electricity
State two problems with metals
Some corrode when exposed to air, metal fatuige
Name three pollutants released into the atmosphere when fuels are burnt.
Carbon monoxide, nitrogen oxides and sulfur dioxides
Give an example of two different alloys
Bronze, Cupronikel
What’s the definition of an ore?
a naturally occurring solid material from which a metal l can be extracted profitably.
Why is aluminum an expensive metal?
because of the amount of electricity used up in the extraction process.
What is limestone formed from?
shells and skeletons of marine animals
Give 2 qualities of transition metals.
good conductors of heat, and can be hammered into shape
Which 3 metals are too soft for many uses?
pure aluminum, gold and copper
Give 2 qualities of aluminum and titanium.
Low density and resistant to corrosion
