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"Exploration - Density of Matter" Scale, Mass and Density of the Material World PPT Courseware 6
1. Metal blocks A and B with the same mass are gold and copper.
2. Metal blocks of the same volume - - are gold, - - are copper.
3. Which of the two metal blocks with different masses and different volumes is gold and which is copper?
Group experiment
A: Use a balance and measuring cylinder to measure the mass and volume of different glass spheres and record them.
B: Use a balance and scale to measure the mass and volume of different aluminum blocks and record them.
View and analyze density tables
1. Find the solid, liquid and gas with the highest density in the table.
2. Are there substances with the same density? What?
3. What is the density of water? What does it mean?
4. Is the density of ice the same as that of water? What does it mean?
Think: Does a drop of water have the same density as a bucket of water?
Which one has greater density, the small piece of iron or the large piece of iron?
density applications
Example 1: A shot put used for physical exercise has a mass of 4 kg and a volume of 0.57 dm3. Is this shot put made of lead?
Solution: According to the density calculation formula, we can get
ρ=m/v=4 kg/0.57x10_3 m3
=7.01x103 kg/m3
Answer: According to the density table, the density of lead is 11.3x103 kg/m3, so this ball is not made of lead.
Example 2: An oil can has a volume of 5 L. How many kilograms of oil with a density of 0.9x103 kg/m3 can be filled?
Solution: According to the density calculation formula, we can get
m = ρV = 5x10-3 m3 x 0.9x103 kg/m3= 4.5 kg
Answer: This oil can can hold 4.5 kg of oil.
Thinking questions
Mom bought a gold necklace. Can you help her identify whether it is made of pure gold? Describe the equipment you will use and how you will identify it.
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"Exploration - Density of Matter" Scale, Mass and Density of the Material World PPT Courseware 5:
"Exploring the Density of Matter" Scale, Mass and Density of the Material World PPT Courseware 5 The experiment is divided into three groups of students to do different experiments ① Group: measure the mass of 6ml and 10ml of water ② Group: measure the mass of 10cm3 and 20cm3 copper blocks ③ Group: Measure 10cm3 and 20cm3 iron blocks..
"Exploration - Density of Matter" Scale, Mass and Density of the Material World PPT Courseware 4:
"Exploring the Density of Matter" Scale, Mass and Density of the Material World PPT Courseware 4 1. Proportion Questions Example 1 The density ratio of two substances A and B is 3:2, and the mass ratio is 2:1. Find the ratio of their volumes. Analysis: This is a question about finding proportions. First, use the density formula...
"Exploration - Density of Matter" Scale, Mass and Density of the Material World PPT Courseware 3:
"Exploring the Density of Matter" Scale, Mass and Density of the Material World PPT Courseware 3 General methods of measuring experimental design (1) Select the relevant physical formula according to the needs of measurement (2) Select the measurement based on the physical quantity to be measured in the formula Tools (3) Familiar with measurement..