Question

1. list and describe five techniques that you can use to physically separate mixtures. 6. an object has a mass of 1.2 kg. its dimensions are 8 cm wide, 10 cm long, and 20 cm tall. please calculate the following information. (show all work to get credit.) a. mass of the object (grams) b. volume of the object (cm³) c. density of the object (g/cm³) 1200 (grams) 1600 (cm³) 0.75 (g/cm³)

Explanation:

Step1: 单位换算

将质量$m = 1.2kg$换算为克，因为$1kg=1000g$，所以$m = 1.2\times1000 = 1200g$。

Step2: 计算体积

根据长方体体积公式$V=l\times w\times h$（$l$为长，$w$为宽，$h$为高），已知$l = 10cm$，$w = 8cm$，$h = 20cm$，则$V=10\times8\times20=1600cm^{3}$。

Step3: 计算密度

根据密度公式$
ho=\frac{m}{V}$，将$m = 1200g$，$V = 1600cm^{3}$代入，可得$
ho=\frac{1200}{1600}=0.75g/cm^{3}$。

Answer:

a. 1200 grams
b. 1600 $cm^{3}$
c. 0.75 $g/cm^{3}$