2. Which kind of model would you use to represent a human heart?
a. a mathematical model
b. a physical model
C. a conceptual model
d. a natural model

Which of the following statements is not true? • a. covalent compounds have low melting and boiling points. • ob. covalent bonds between atoms of a compound are relatively weak compared to bonds between molecules. • c. covalent bonds occur between nonmetals. • d. covalent compounds are often gases or liquids.

If 10.g of agno3 is available, what volume of 0.25 m agno3 can be prepared

Which of these conditions most likely produces an unstable isotope?