The oxidizing agent our bodies use to obtain energy from food is oxygen (from the air). if you breathe 15 times a minute (at rest), taking in and exhaling 0.5 l of air with each breath, what volume of air do you breathe eat day? air is 21% oxygen by volume. what volume of oxygen do you breathe each day?

Explanation:

Given parameters:

Number of breathe per minute = 15times

Volume of air per breath = 0.5L

Percentage of oxygen in air = 21%

Solution

There are 24 hours in a day.

 60minutes makes a hour in a day,

I will breathe:

           15 times x 60 x 24  = 21600 times in a day

The volume of air I will take in per day:

       A breathe = 0.5L of air

    21600breathe = 0.5 x 21600 = 10800L of air

Volume of oxygen I will breathe per day:

    x 10800 = 2268L of oxygen

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance