reactions
what is a chemical reaction?
A chemical reaction is when a new substance is produced.
what is an atom?
an atom is what makes up everything
what energy is emitted by radioactive substances?
Nuclear radiation
what is the technique radiometric dating?
naturally occurring radioisotopes can be used to calculate the age of samples from archaeological sites.
what is called a thermal flash?
when nuclear weapons are detonated, enormous amounts of heat and radiation spread out from the centre of the blast called ground zero in what is called a thermal flash
what are reactants?
reactants are the original substances that remain.
what are isotopes?
Isotopes are atoms of the same element with different mass numbers
What are the 3 different types of nuclear radiation?
Alpha particles, beta particles and gamma rays.
What is half life of isotope carbon 14
5700 years.
how many nuclear weapons are there in the world?
there are approximately 20 000 nuclear weapons
What are the products?
state the law of conservation of mass
the apparent loss of mass was caused by gases moving into the atmosphere
what are alpha particles?
Alpha particles are helium nuclei that contain 2 protons and 2 neutrons.
what is radiocarbon dating?
Radiometric dating with carbon
what is the core of the atom
nucleus
when do chemical reactions take place?
Chemical reactions take place when the bonds between atoms are broken and new bonds are formed.
what is the law of constant proportions?
states that a compound, no matter how it is formed always contains the same relative amounts of each element
what are beta particles?
beta particles are the same size and mass as electrons.
what is used in nuclear reactors?
The radioactive properties of uranium are used in the generation of electricity in nuclear reactors
what is an acid?
something that is corrosive but not everything
what are endothermic and exothermic reactions?
Exothermic reactions are reactions that release energy and endothermic reactions are reactions that absorb energy.
what are 3 possible sources of energy which could start a reaction?
a beam of light, bunsen burner or electric current
what are gamma rays?
Gamma rays are not particles but a burst of energy released after alpha or beta particles.
what are fuel rods?
Uranium is converted to uranium dioxide and then sealed in rods
are bases dangerous /
no