**Calculating Density**

—Mass is measured in grams. The abbreviation is

*g*.—Volume is measured in cubic centimeters (centimeters cubed). The abbreviation is

*cm*.^{3}

__An Example:__—My Lego block has the following measurements:

H | 4.5 cm | | 4.5 cm • 4 cm | 18 cm ^{2} |

L | 4 cm | | 18 cm ^{2} • 2 cm | 36 cm ^{3} |

W | 2 cm | | | |

Mass | 18 g | | Volume | 36 cm^{3} |

Density = Mass ÷ Volume = 18 g ÷ 36 cm

^{3}**Density = ½ g/cm**

^{3}or 0.5 g/cm^{3}

*Solve the following problems. Be sure to write out every step. Use the proper units in each step* 1. One of our Lego blocks measures 12 cm x 10 cm x 2 cm. Its mass is 120 grams. What is its density? | |

2. Another Lego block is 5 cm x 5 cm x 6 cm. Its mass is 75 grams. What is its density? | |

3. A third Lego block is 1.5 cm x 4 cm x 8 cm. If it has the same density as the other blocks, what is its mass? | |

4. You have a rock with a volume of 15 cm ^{3} and a mass of 45 g. What is its density? | |

5. You have a different rock with a volume of 30cm ^{3} and a mass of 60g. What is its density? | |

6. In the above two examples which rock is heavier? Which is lighter? | |

7. In the above two examples which rock is more dense? Which is less dense? | |

8. A golden-colored cube is handed to you. The person wants you to buy it for $100, saying that is a gold nugget. You pull out your old geology text and look up gold in the mineral table, and read that its density is 19.3 g/cm ^{3}. You measure the cube and find that it is 2 cm on each side, and weighs 40 g. What is its density? Is it gold? Should you buy it? | |

Any answers to these questions???

ReplyDelete1. .5g per cubic centimeter

ReplyDelete2. .5ger cubic centimeter

3. 29g

4. 3g per cubic centimeter

5. 2g per cubic centimeter

6. Rock 1

7. Rock 1

8. 6g per cubic centimeter. No