Change of velocity per second (in metres per second per second m/s²')
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Acid
A sour substance that can attack metal, clothing or skin. The chemical opposite of an alkali. When dissolved in water, its solution has a pH number less than 7. Acids are proton (H+ions) donors.
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Activation energy
The minimum energy needed to start off a reaction
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Activie site
The site on an enzyme where the reactants bind.
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Algal cells
The cells of algae, singled-celled or simple multicellular organisms, which can photosynthesise but are not plants
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Alkali
Its solution has a pH number more than 7
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Allele
A version of a particular gene
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Alpha radiation
Alpha particles, each composed of two protons and two neutrons, emitted by unstable nuclei
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Alternating current
Electric current in a circuit that repeatedly reverses its direction
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Amino acid
The building block of protein
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Amylase
The enzyme made in the salivary glands and the pancreas that speeds up the breakdown of starch into simple sugars
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Anhydrous
Describes a substance that does not contain water
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Aqueous solution
The mixture made by adding a soluble substance to water
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Atomic number
The number of protons (which equals to the number of electrons) in an atom. It is sometimes called the proton number
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Attract
To cause to move nearer
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Other cards in this set
Card 2
Front
A sour substance that can attack metal, clothing or skin. The chemical opposite of an alkali. When dissolved in water, its solution has a pH number less than 7. Acids are proton (H+ions) donors.
Back
Acid
Card 3
Front
The minimum energy needed to start off a reaction
Back
Card 4
Front
The site on an enzyme where the reactants bind.
Back
Card 5
Front
The cells of algae, singled-celled or simple multicellular organisms, which can photosynthesise but are not plants
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