Unit 1 Chemistry Review Notes - Riya Patel Unit 1 Chemistry Review Notes Grade 10 Review Chemical and Physical Changes Physical does not change the

Unit 1 Chemistry Review Notes - Riya Patel Unit 1 Chemistry...

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Riya Patel 3/10/16 Unit 1 Chemistry Review Notes Grade 10 Review: Chemical and Physical Changes Physical- does not change the substance and can be reversed Chemical- a new substance is formed and energy is either given off or absorbed - Change in state - Change in shape - Reversible - Dissolving (type of) - Change in colour - Release of gas - Hard to reverse - Releasing of heat - A precipitate forms Eg. Cutting paper, melting ice Eg. Baking a cake, fireworks Subatomic Particles Atomic Notation 1) T h e atomic number is the number of protons 2) Atoms must have an equal number of protons and electrons. Therefore, the # of protons equals the number of electrons 3) If there is a + ion subtract the charge by the atomic number to get the # of electrons 4) If there is a - ion add the charge by the atomic number to get the # of electrons Isotopes Definition Isotopes are atoms of the same element that have the same number of protons but different number of neutrons Pure substances will not always contain identical atoms, there will be various isotopes in a pure substance Comparing isotopes: All isotopes have the same number of protons They would have different atomic masses because they differ in the # of neutron They would have the same # of electrons Physical and chemical properties would be similar because of identical electron arrangement Unstable/ Radioactive Isotopes Isotopes are sometimes stable, however some break apart easily Unstable isotopes are known as radioisotopes. The nucleus of a radioisotope breaks apart and emit high-energy particles (nuclear radiation)
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Riya Patel 3/10/16 o This emission allows radioisotopes to change into stable isotopes over time The three types of particles emitted: o Alpha particles (α): 2 protons and 2 neutrons (structure of helium nucleus) o Beta particles (β): a negatively charge electron; neutron is ± it releases a negative charge, which changes the atomic number o Gamma rays: high-energy electromagnetic radiation, have no mass and travel at the speed of light
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  • Spring '16
  • Ms. Markandaier
  • Atom, Riya Patel

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