Chemistry - Atoms
What is the electron configuration of sodium?
2, 8, 1
What is formed when magnesium is heated in air?
Magnesium oxide
Where is a star for the majority of its life cycle?
On the main sequence
What element is left in large amounts after the Big Bang, providing evidence that it happened?
Helium
What are two things that can happen to the carbon in dead plants and animals?
Fossil fuels or decomposition
What gives the atomic number of an element?
Number of protons
What type of reaction produces many products from one reactant?
Decomposition
What puff of gas is given off from a late-stage red giant?
Planetary nebula
What frequency and wavelength of light are given off by a star moving away from us?
Low frequency and long wavelength
What process converts carbon dioxide form the air back into oxygen?
Photosynthesis
What is the name for the outermost electron shell in an element?
Valence shell
What type of reaction produces a gas that can be identified by the pop test?
Acid-metal
What is the next stage of life for a star, two times the size of the Sun, when it reaches the end of the main sequence?
Red giant
When did the Big Bang occur?
About 13.7 billion years ago
What do denitrifying bacteria convert nitrates into?
Atmospheric nitrogen
How many atoms of chlorine are needed to form an ionic compound with aluminium?
Three
What is produced when copper carbonate is poured over solid aluminium?
Aluminium carbonate and copper
What type of star is really hot but not very bright, because it is the tiny remnants of a red giant?
White dwarf
Doppler effect
What is the chemical formula for ammonia?
NH3
What is the chemical formula for sodium sulfate?
Na2SO4
Which of these is insoluble: silver nitrate, ammonium nitrate, silver chloride or ammonium chloride?
Silver chloride
What reactions happen when temperature and pressure build up inside a protostar?
Nuclear fusion reactions
The idea that the further a star is away from us, the faster it is moving, is known as?
Hubble's Law
Where do most nitrogen-fixing bacteria live?
Root nodules of leguminous plants