7. An unknown liquid occupies a volume of 5 ml and has a mass of 40 grams. Find its density. *
O A. 20 g/mL
OB. 35 g/mL
O C. 200 g/mL
O D. 8 g/mL

Explanation:

The density of a substance can be found by using the formula

From the question

mass of object = 40 g

volume = 5 mL

The density of the object is

We have the final answer as

Hope this helps you

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

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radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.