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# Physics Unit 2

Question | Answer |
---|---|

What is a balance used for? | Measuring mass |

What is a graduatated cylinder used for? | Measuring the volume of a liquid |

What is a beaker used for? | It is NOT for measuring. It just holds chemicals. |

What are some things you never do in the lab? | Never mix chemicals without asking or following directions, smell something directly, goof off, not tell the teacher when something spills or breaks, work without glasses or goggles, use the bunsen burner without putting long hair back or sleeves up... |

What is the safe way to smell something? | Waft it |

What is the safe way to heat something in a test tube over a bunsen burner. | Use test tube tongs and hold it high up over the flame to heat it gently and DO NOT point it at anyone. |

What is the safe way to carry the balance. | Carry it by the base, not the sensitive balance/measuring arm |

Define Mass. | Mass is the amount of matter in something. |

Define Volume. | Volume is the amount of space something takes up. |

Define length. | Length is the distance between 2 points. |

Define Temperature. | Temperature is how hot or cold something is because of the movement (kinetic energy) of its particles. |

Define Time | Time is the interval between 2 events happening |

What is the SI unit and measuring device for length? | meter, metric ruler or meterstick |

What is the SI unit and measuring device for volume of a liquid? | L or mL, graduated cylinder |

What is the SI unit and measuring device for mass? | g or kg, balance |

What is the SI unit and measuring device for Temperature? | Degrees Celsius or Kelvin, thermometer |

What is the SI unit and measuring device for time? | Second, stopwatch |

Name the metric units from smallest to largest | milli, centi, deci, (base), deka, hecto, kilo |

Which metric prefix means 10 | deka- |

Which metric prefix means 1/10 | deci |

Which metric prefix means 1000 | kilo- |

Which metric prefix means 1/1000 | milli- |

Convert 18 mm to cm | 1.8 cm |

Convert 52 g to mg | 52,000 mg |

Convert 1600 m to km | 1.5 km |

What is a base unit? | One of the 7 defined standards for measurement in the SI system |

What is a Standard? | An exact quantity people agree to use to compare measurements |

The SI system is a base ___ system? | 10 |

What are the 7 base units? | meter, kg, second, ampere, Kelvin, mole, and candela |

What is a derived unit? | a unit of measure that comes from combining base units |

What are some derived units? | cm3, L, mL, g/mL, m/s |

What is density? | the mass per unit volume of something |

What is the equation for density? | D=m/V |

Numbers in science have a __ and ___ | number and label or unit of measure |

What is dimensional analysis or the factor label method? | a method of converting between two different units of measure by putting the first number and unit over 1 and multiplying by a conversion factor as a fraction to cancel out the labels |

What are significant figures? | All valid numbers in a measurement - all known for sure by lines plus one guess between the lines |

What is precision? | the degree of exactness of a measurement. It mostly depends on the measuring device |

What is accuracy? | how close your measurements are to the correct answer for that measurement |

A comparison between an unknown quantity and a standard (g, m, L...) is defined as what? | measurement |

What is parallax in measurement? | How measurements look different based on the location of your eyes to the device. It is why we read at eye level! |

How many sig figs? 0.025202 | 5 |

How many sig figs? 21,010 | 4 |

How many sig figs? 21,010.0 | 6 |

What is the rule for multiplying and show sig figs in your answer? | Count Sig Figs. Answer is the same as least starting number. |

What is the rule for adding and showing sig figs in your answer? | Count decimal places. Answer is the same as least starting number. |

If 1.0 fl oz = 30. mL, how many mL in 8 fl oz? | 240 mL |

If 1.00 kg = 2.20 lbs, how many kilograms would a 251 lb football player be? | 114 kg |

What is the density of a 25 g object that has a volume of 5.0 mL? | 0.50 g/mL |

what is the mass of an object whose density is the same as water (1.0 g/mL), and takes up a volume of 5.5 mL | 5.5 g |