Question

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

Explanation:

Concentration refers to the amount of one substance mixed with another. Common density units are g/cm³ (for mass - volume density), people/m² (for population density), GB/m² (for data - storage density). Concentration is often measured in ppm. Blood - alcohol content is commonly in g/100 ml.

Answer:

1. C. Concentration is used to describe the amount of one substance that is mixed with another
2. B. Common units for density are g/cm³, people/m², and GB/m². Common units for concentration are ppm and ml/mg. Common units for blood alcohol content are g/100 ml