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Yr 8 Revision

Rates of Photosynthesis, Lunar and Solar Eclipse, Elements

Name four factors that affect Photosynthesis? Light intensity, the level of carbon dioxide, temperature, water.
How does light intensity effect the rate of photosynthesis? Light provides the energy needed to join carbon dioxide and water together. The more light there is the greater the photosynthesis.
How does temperature affect the rate of photosynthesis? Thermal energy is needed so that all the chemical reactions in the plant can happen quickly enough. The best temperature for photosynthesis is around 25 degrees celsius. Temperature over 40 degrees celsius damage plant cells, and photosynthesis stops.
There is very little carbon dioxide present in the air. By what process is this gas quickly replaced? Respiration
Describe the alignment that would cause a lunar eclipse? a lunar eclipse occurs when the Earth comes between the Sun and the Moon and the Earth's shadow is reflected on the surface of the Moon.
In a solar eclipse, what is the scientific name for the complete shadow? umbra
In a solar eclipse what is the scientific name for partial shadow? penumbra
Why does the Moon not block out the Sun all over the Earth during a Solar eclipse? A total eclipse does not happen all over the World because the Moon is smaller that the Earth.
What is the term used to describe the moment when the Moon stops covering the Earth? The end of totality.
What is an element? A substance made up of only one type of atom.
Define formula The formula for an element tells you whether it is made up of single atoms or a molecule.
What is a molecule? A molecule may contain more than one atoms. When they are particles from different elements they form a compound.
What is a compound? A compound is made up of two or more elements that are chemically linked together.
What are the particles that form an atom? Protons, Neutrons and electrons
In a compound what is the term used to describe when two atoms join together by sharing electrons? Covalent bonds
In a compound what is the term used to describe the bond where an atom passes an electron to another element? Ionic bonds
Created by: PMcleod