Question | Answer |
matter | anything that takes up space and has mass |
chemistry | the study of the structure, properties, and composition of substances, and the changes that substances undergo. |
physical property | a quality of a substance that can be observed or measured without changing the substance's chemical composition |
mixture | a physical blend of two or more substances that are not chemically combined. |
element | a substance that cannot be changed into simpler substances under normal laboratory conditions |
compound | a substance that can be separated into simpler substances (elements or other compounds) only by chemical reaction. |
chemical property | the ability of a substance to undergo chemical reactions and to form new substances |
energy | the capacity for doing work; it exists in several forms, including chemical, nuclear, eletrical, radiant, mechanical and thermal energies. |
What are the steps of the scientific method? | Observation -> Hypothesis -> Experiments -> theory |
What is the difference between homogenous and heterogeneous? | A heterogeneou mixture is not a uniform composition, but a homogeneous mixture is uniform/the same |
What are the 5 probable sings of a chemical change? | 1.color 2.bubbling(making gas) 3. the making/breaking down of a solid 4.temperature 5.oder |
Describe elements' atoms | they are the same |
Describe compounds' atoms | different atoms |
Describe mixtures' atoms | different atoms that are not chemically combined |
What is the relative volocity of a liquid? | The molecules are farther apart and move faster then the molecules of a solid |
What is the relative volocity of a gas? | The molecules are futher apart and move even faster that the molecules of a liquid. |
carbon | element |
nickel | element |
copper | element |
oxygen | element |
aluminum | element |
carbon dioxide | compound |
water | compound |
baking soda | compound |
table sugar | compound |
air | mixture |
plastics | mixture |
fabric | mixture |
wood | mixture |
well water | mixture |
bottled water | mixture |
a nickel | mixture |
a penny | mixture |
brass | mixture |
bronze | mixture |
baking powder | mixture |
steel | mixture |
physical properties | color, solubility, odor, hardness, density, melting point, and boiling point. |
Chemical properties | rust, rot, burn, decompose, ferment, expode, and corrode |