A student has a marble with a mass of 50 grams. To determine the volume of the marble, the water displacement method is used. The student places the marble in 50 mL of water in a graduated cylinder, and the water level rises to 70 mL. What is the density of the marble? A 20 g/mL B 120 g/mL c 0,4 g/mL D 2.5 g/mL

D 2.5 g/mL

Explanation:

The density of a substance/object can be calculated by using the formula:

Density = mass/volume

Where;

Density = g/mL

Mass = grams

Volume = mL

The water displacement method was used to calculate the volume of the marble. The student places the marble in 50 mL of water in a graduated cylinder, and the water level rises to 70 mL. This means that the volume of the marble is 70mL - 50mL = 20mL

The mass of the marble is 50g

Hence, the density of the marble is as follows:

Density = 50/20

Density = 2.5g/mL

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the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.