Test 1 – Chemistry Test Questions – Flashcards
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| What is one cause of the decline of the Roman Empire? |
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| lead poisoning |
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| What happens if there is a low cobalt level in inmates? |
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| violent behavior |
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| What helps control manic depression? |
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| lithium salts |
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| What are "mating chemicals"? |
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| pheromones |
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| How can atoms be viewed? |
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| by using the scanning tunneling microscope |
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| macroscopic |
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| large |
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| microscopic |
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| small |
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| What is water composed of? |
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| two hydrogen atoms and one oxygen atom |
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| How can water be split into hydrogen and oxygen gases? |
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| electrolysis |
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| What is electrolysis? |
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| using an electric current to split something |
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| What is made of atoms? |
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| matter |
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| What causes substances to change form? |
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| reorganization of atoms |
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| Define the problem, collect background information, form a hypothesis, test the hypothesis in an experiment, record data, draw conclusions and retest |
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| scientific theory |
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| possible explanation for an observation |
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| hypothesis |
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| What is a set of tested hypotheses that give an overall explanation (interpretation/why)? |
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| theory/model |
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| summarizes what happens without telling why |
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| law |
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| mass is neither created nor destroyed in a chemical change but may change forms |
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| law of conservation of mass |
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| gas and pressure |
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| Boyle |
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| cannot be broken down into a simpler substance |
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| element |
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| father of modern chemistry, beheaded because of political affiliation (burning/conservation of mass) |
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| Lavoisier |
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| involves no numbers (blue sky) |
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| qualitative data |
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| measurement (involves a number and a unit) |
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| quantitative data |
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| amount of space occupied by an object |
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| volume |
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| 1 Liter= |
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| 1 dm^3= 1000cm^3 |
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| 1 mL= |
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| 1 cm^3 |
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| amount of matter, measure of resistance of an object to change its state of motion |
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| mass |
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| amount of gravitational pull on an object |
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| weight |
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| Mass is constant, but what can change with location? |
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| weight can |
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| What are all uncertain? |
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| measurements |
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| Where should liquids be read from? |
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| meniscus |
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| meniscus |
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| bottom of the curve |
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| all known digits plus one estimated digit |
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| significant figures |
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| closeness to true value |
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| accuracy |
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| reproducible measurements |
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| precision |
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| Body temp in F |
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| 98.6 |
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| Body temp in C |
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| 37 |
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| Body temp in K |
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| 310 |
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| What happens the closer on gets to absolute zero? (theoretical bc it has never been reached) |
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| it gets harder to remove anymore energy |
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| C to K |
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| K=C+273.15 |
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| K to C |
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| C=K-273.15 |
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| C to F |
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| F=9/5C+32 |
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| F to C |
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| C=5/9(F-32) |
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| mass/volume |
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| density |
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| rigid and have fixed shapes |
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| solids |
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| definite volume but not definite shape |
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| liquid |
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| no fixed volume or shape and is compressible (can be pushed together) |
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| gas |
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| 3ft= |
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| 1 yard |
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| 2000 lbs= |
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| 1 ton |
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| density of water |
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| 1 g/mL |
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| look the same throughout |
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| homogeneous |
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| visibly distinguishable parts |
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| heterogeneous |
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| homogenous mixture |
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| solution |
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| How can mixtures be separated into pure substances? |
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| physical means |
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| What is a pure substance? |
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| something that has a constant composition (elements and compounds) |
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| combination of two or more elements in a specific ratio that can be separated by chemical means |
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| compound |
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| boiling, freezing, etc |
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| physical changes |
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| rusting, burning (cannot be changed back to original) |
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| chemical changes |
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| differences in volatility (how readily something becomes a gas) |
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| distillation |
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| solid and liquid |
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| filtration |
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| separates due to pigments and colors |
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| chromatography |
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| listed on the periodic table |
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| elements |
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| What makes a measurement valid? |
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| number and units |
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| mass |
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| kilogram (kg) |
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| length |
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| meter (m) |
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| time |
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| second (s) |
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| temperature |
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| Kelvin (K) |
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| electric current |
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| ampere (A) |
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| amount of a substance |
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| mole (mol) |
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| luminous intensity |
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| candela (cd) |
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| How thick is a dime? |
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| 1 mm |
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| What is the diameter of a quarter? |
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| 2.5 cm |
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| What is the average height of an adult man? |
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| 1.8 meters |
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| What is the mass of a nickel? |
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| about 5 grams |
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| What is the mass of a 120 lb person? |
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| about 55 kg |
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| What is the volume of a 12 oz can of soda? |
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| 360 mL |
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| boiling pt of water in F |
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| 212 |
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| Freezing pt of water in F |
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| 32 |
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| Boiling pt of water in C |
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| 100 |
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| Freezing pt of water in C |
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| zero |
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| Boiling pt of water in K |
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| 373.15 |
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| Freezing pt of water in K |
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| 273.15 |
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| absolute 0 in C |
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| -273.15 |
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| Absolute 0 in K |
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| zero |
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| Absolute 0 in F |
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| -459.67 |
