Atoms, Elements, Compounds and Limestone Flashcards
What charge do electrons have?
Negative
What charge do neutrons have?
Neutral
The number of electrons equals the number of _______.
Protons
The number of ____ on the outer shell shows the group that the element is in.
Electrons
The most inner shell holds how many electrons max?
2
Not counting the inner shell, how many electrons do the shells hold max?
8
An atom is unreactive and stable if it has what?
Full outer shells.
What does me+aL mean?
Metals become positive.
They are losers as they lose electrons.
What are ions?
When an atom gains or loses an electron and has a + or a - next to it.
Copper is a good conductor of electricity. What could It be used for?
Electrical wire.
Aluminium can be made into thin sheets. What is it good for?
Cooking foil.
Gold reflects light. What is it good for?
Jewellery
Brass can be used to make a noise. What is it good for?
Musical instruments.
Iron is cheap because there is a lot of it. What is it good for?
Gates
Tungsten can be heated until it is white hot. What is it good for?
Light bulbs.
Mercury expands when it is heated. What is it good for?
Thermometer
Lead has a high density. What is it good for?
Plumb line.
Chromium does not rust. What is it good for?
Car bumpers.
Nickel is hard. What is it good for?
Coins.
Limestone is also called ______.
Calcium Carbonate
What is the equation for quick lime?
Calcium Oxide + Carbon Dioxide
Or
CaO + CO2
What is slaked lime also known as? (Give its name and its formula)
Calcium Hydroxide
Ca(OH)3 (s)
What is the formula for lime water?
Ca(OH)3 (aq)
The process to turn limestone to quick lime is _______.
Thermal decomposition.
The turn quick lime to slaked lime you add a few drops of what?
Water (H2O)
To turn slaked Lime to lime water, you add ______.
More water
Adding more water to slaked lime makes Lime water a ______.
Solution
To turn lime water to limestone, you add _______.
Carbon Dioxide (CO2)
Name some advantages of limestone quarries.
You can make things such as cement, mortar and glass.
It makes jobs for the unemployed such as drivers, builders and those who work in the quarries.
It is environmentally beneficial.
Name some disadvantages of limestone quarries.
Used land/eyesore/land pollution It's noisy Smoke/ air pollution. It's a safety hazard There's a lot of dust involved.
What charge to protons have?
Positive
