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21 Cards in this Set
- Front
- Back
What are atoms? |
they are basic building blocks |
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Atoms and molecules are tiny particles that what? |
compose all common matter |
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1 single drop of a mixture contains how many atoms? |
one billion trillion ( 1 X 10^9 X 10 ^12 ) |
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How is soda a mixture of chemicals? |
Because it contains several chemicals like carbon dioxide, water, sugar, dyes, etc. |
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What atoms make up Carbon dioxide? |
two carbon atoms and one hydrogen atom that are held together by chemical bonds |
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One characteristic of carbon dioxide molecules? |
at room temp carbon dioxide molecules turn into gas |
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What atoms are in water? |
two hydrogen, one oxygen |
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What is one characteristic of a water molecule |
they make water a liquid at room temp and liquid to solid at cold temps |
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What happens to water when it turns from liquid to solid? |
it expands and becomes less dense |
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what does chemistry explain? |
it explains the properties and behavior of chemicals |
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what is a systematic approach to science |
the scientific method |
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what are hypothesis? |
interpretations of the observations |
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What do laws do |
they summarize the results of a large number of observations and are proven over and over |
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What are theories |
they explain and give the underlying the CAUSE of observations and laws |
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what does the mass of an object measure? |
they measure the QUANTITY of matter within it |
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what is the scientific law? |
a statement that combines past observations and predicts future ones |
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What is the law of conservation of mass? |
"in a chemical reaction, matter is neither created nor destroyed" but just rearranged |
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What is chemistry? |
the science that seeks to understand what matter does by studying what atoms and molecules do |
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What is the scientific method? |
way of learning that emphasizes observation and experimentation to produce knowledge as the result of the senses |
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What are observations? |
involved measuring or observing some aspect of nature |
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What is the atomic theory? |
all matter is made up of tiny indivisible particles (atoms) |