1.(2 point) Calculate the density of a spoon that weighs 7.09 g and has a volume of 4.14 cm3. Express your answer in g/cm3.
2.(2 points) Calculate the density of rock that weights 14.5 Kg and has a volume of 141 cm3. Express your answer in Kg/m3.
3.(2 points) Gizmo, a 6.81 Kg Mogwai jumps into a large cylinder containing water. The water level rises 2.0 L. What is the density of the Mogwai? Express your answer in Kg/L. Also, assume no water splashes out of the cylinder while the Mogwai are multiplying.
4.(2 points) A stone weighing 4.32 g is placed in a graduated cylinder containing 25.3 mL of water. After the stone is added to the cylinder the water rises to 27.4 mL. What is the density of the stone? Express your answer in g/mL.
5.(2 points) A rectangular solid has dimensions 3.0 cm by 6.3 cm by 5.2 cm and a mass of 71 g. What is its density? Express your answer in g/mL.
6.(2 points) A sphere has a radius of 3.10 cm, and a density of 6.12 g/cm3. What is its mass? Express your answer in grams.
7.(2 points) Mr. Finnigan has a particular proclivity for pyrotechnics. He will use right circular cylinders with a height of 12.0 cm and a radius of 11.6 cm. If the density of his powder is 8.41 g/cm3, how many grams of powder does he need to stop the Snatchers from getting to Hogwarts if he needs 14 of these cylinders? Express your answer in Kg.
Can someone please help me with chemistry?
2016-05-30 8:50 pm
回答 (3)
2016-05-30 9:01 pm
✔ 最佳答案
1. (7.09 g) / (4.14 cm^3) = 1.71 g/cm^3
2.
(14.5 kg) / (141 cm^3) = 0.103 kg/cm^3
3.
(6.81 kg) / (2.0 L) = 3.4 kg/L
4.
(4.32 g) / (27.4 - 25.3) mL = 2.06 g/mL
5.
(71 g) / (3.0 cm x 6.3 cm x 5.2 cm) = 0.72 g/cm^3 = 0.72 g/mL
6.
(4/3) x pi x (3.10 cm)^3 x (6.12 g/cm^3) = 764 g
7.
pi x (11.6 cm)^2 x (12.0 cm) x 14 x (8.41 g/cm^3) = 597271 g = 597 kg
2016-05-30 9:09 pm
1.
Density of the spoon
= (7.09 g) / (4.14 cm³)
= 1.71 g/cm³
====
2.
Density of rock
= (14.5 kg) / (141/1000000 m³)
= 103000 kg/m³
====
3.
Density of Gizmo
= (6.81 kg) / (2.0 L)
= 3.4 kg/L
====
4.
Density of stone
= (4.32 g) / [(27.4 - 25.3) mL]
= 2.06 g/mL
====
5.
Density of the solid
= (71 g) / (3.0 × 6.3 × 5.2 cm³)
= 0.722 g/cm³
= 0.722 g/mL
====
6.
Mass of the sphere
= (6.12 g/cm³) × [(4/3) × π × 3.10³ cm³]
= (6.12 g/cm³) × [(4/3) × 3.14 × 3.10³ cm³]
= 763 g
====
7.
Mass of powder
= (8.41 g/cm³) × [(π × 11.6² × 12.0 cm³) × 14 ]
= (8.41 g/cm³) × [(3.14 × 11.6² × 12.0 cm³) × 14 ]
= 597000 g
= 597 kg
Density of the spoon
= (7.09 g) / (4.14 cm³)
= 1.71 g/cm³
====
2.
Density of rock
= (14.5 kg) / (141/1000000 m³)
= 103000 kg/m³
====
3.
Density of Gizmo
= (6.81 kg) / (2.0 L)
= 3.4 kg/L
====
4.
Density of stone
= (4.32 g) / [(27.4 - 25.3) mL]
= 2.06 g/mL
====
5.
Density of the solid
= (71 g) / (3.0 × 6.3 × 5.2 cm³)
= 0.722 g/cm³
= 0.722 g/mL
====
6.
Mass of the sphere
= (6.12 g/cm³) × [(4/3) × π × 3.10³ cm³]
= (6.12 g/cm³) × [(4/3) × 3.14 × 3.10³ cm³]
= 763 g
====
7.
Mass of powder
= (8.41 g/cm³) × [(π × 11.6² × 12.0 cm³) × 14 ]
= (8.41 g/cm³) × [(3.14 × 11.6² × 12.0 cm³) × 14 ]
= 597000 g
= 597 kg
收錄日期: 2021-04-18 14:54:00
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