Question

what do we mean by density?
a. density is used to describe the area on a surface
b. density is used to describe how thick a liquid is
c. density is used to describe compactness or crowding
d. density is used to describe how much liquid is in a container
what do we mean by concentration?
a. concentration is used to describe how fast a substance is changing in volume
b. concentration is used to describe how thick a liquid is
c. concentration is used to describe how hot or cold a substance is
d. concentration is used to describe the amount of one substance that is mixed with another
describe common units of density, concentration, and blood - alcohol content. choose the correct answer below
a. common units for density are g/cm³, people/m², and gb/in². common units for concentration are ppm and ml/mg. common units for blood - alcohol content are g/100 ml
b. common units for density are ppm, people/m², and gb/in². common units for concentration are ml/mg. common units for blood - alcohol content are g/cm³
c. common units for density are ppm and ml/mg. common units for concentration are g/cm³, people/m², and gb/in². common units for blood - alcohol content are g/100 ml
d. common units for density are g/cm³, people/m², and gb/in². common units for concentration are ppm. common units for blood - alcohol content are ml

Explanation:

Density is a measure of compactness or crowding and common units include $\text{g/cm}^3$, $\text{people/m}^2$, $\text{GB/m}^2$. Concentration refers to the amount of one - substance mixed with another, with common units like ppm and $\text{ml/mg}$. Blood alcohol content is commonly measured in $\text{g/100 ml}$.

Answer:

A. Common units for density are $\text{g/cm}^3$, $\text{people/m}^2$, and $\text{GB/m}^2$. Common units for concentration are ppm and $\text{ml/mg}$. Common units for blood alcohol content are $\text{g/100 ml}$