A sample of a substance has a mass of 7.5 g and a volume of 2.5 cubic centimeters. What is the object’s density? A.) 3 grams per cubic centimeter
B.) 10 grams per cubic centimeter
C.) 0.3 grams per cubic centimeter
D.) 20.44 grams per cubic centimeter

option A is the correct answer .

Explanation:

as density = mass per unit volume

density = 7.5/2.5 = 3 gm / cm³ ..is the answer ...

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A) d = 3 g/cm³

Explanation:

Given data:

Mass of substance = 7.5 g

Volume of substance = 2.5 cm³

Density of object = ?

Solution:

Formula:

d = m/v

d = density

m = mass

v = volume

by putting values,

d = 7.5 g/ 2.5cm³

d = 3 g/cm³

one state would change   like louisiana to texas. thats a change

explanation:

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.