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padilas [110]
3 years ago
8

Debbie was doing a science lab, and she was instructed to decide whether a piece of plastic would float or sink without actually

putting the plastic in the water. how could she do this?
Chemistry
2 answers:
miv72 [106K]3 years ago
7 0

''Find the density of the plastic and compare it to the density of water''

Aleksandr [31]3 years ago
3 0

Answer:

Debbie can take the following step

1. Find the mass of the substance in kilograms by measuring on a chemical balance and record

2. Fine the volume of the plastic(m^3). if it is a cylindrical plastic, volume will be area multiplied by height(\pi r^{2} h)

3. Density of a substance is the ratio of the mass of a substance to its volume.Find its density and record

4. Compare the density of the substance to that of water which is 1000kg/m^3.

5. If it is greater than that of water then it will sink, if it is less than that of water it will float

Explanation:

Debbie can take the following step

1. Find the mass of the substance in kilograms by measuring on a chemical balance and record

2. Fine the volume of the plastic(m^3). if it is a cylindrical plastic, volume will be area multiplied by height(\pi r^{2} h)

3. Density of a substance is the ratio of the mass of a substance to its volume.Find its density and record

4. Compare the density of the substance to that of water which is 1000kg/m^3.

5. If it is greater than that of water then it will sink, if it is less than that of water it will float

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A board of wood has a density of 0.487 g/cm3. The board is measured to have a length of 3.21 cm, a width of 12.2 cm and a height
ivolga24 [154]

Answer:

The mass of board is 1.52 g.

Explanation:

Given data:

Density of wood = 0.487 g/cm³

Length of board = 3.21 cm

Width of board = 12.2 cm

Height of board = 0.80 mm (0.80/10=0.08 cm)

Mass of board = ?

Solution:

We know that density of an object is equal to the mass of substance divided by its volume. So we can calculate the mass from density formula.

Formula:

D = m/v

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m = mass

v = volume

Now we will calculate the volume first.

V = length × width × height

V = 3.21 cm × 12.2 cm × 0.08 cm

V = 3.13cm³

Now we will calculate the mass.

D = m/v

0.487 g/cm³ = m/ 3.13 cm³

m = 0.487 g/cm³ × 3.13 cm³

m = 1.52 g

The mass of board is 1.52 g.

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