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11 Cards in this Set
- Front
- Back
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2 required properties of matter |
must occupy space and have mass |
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what is matter made up of? |
atoms |
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what is an element? |
homogenous matter, pure substance, all atoms have same number of protons in nucleus, a substance that cannot be separated into simpler substances by chemical means |
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what is a compound? |
elements combined (2 or more), separated by chemical means only, have different properties to the elements they are made from |
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what is a mixture? |
combined substances where each substance retains their distinct identities, they can be heterogeneous or homogeneous |
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Dalton's Atomic Theory no.1 |
1. elements are composed of atoms |
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Dalton's Atomic Theory no.2 |
2. all atoms of a given element are identical - same size, mass and chemical properties - and each element has different atoms from the other |
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Dalton's Atomic Theory no.3 |
3. compounds are composed of more than one element, they always combine in simple whole number ratios |
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Dalton's Atomic Theory no.4 |
4. A chemical reaction does not destroy or create atoms, they are only separated, combined or rearranged |
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what are atoms? |
contain subatomic particles: electrons, protons and neutrons; contains nucleus: with the protons and neutrons, is majority of atomisc mass, minority of atomic volume |
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what are the 3 different phases/stages of matter |
solid: particles closely packed, vibrate in fixed position fluids- liquid: particles not fixed, move past one another gas: particles not foxed, more more freely than liquid |
