Martina has a sample of an unknown substance. she measures the substance. its mass is 13.5 grams, and its volume is 5 cm3. which metal might her sample be made of? a. silver density: b. copper density: c. iron density: d. aluminum density 10.49 g/ cm3 8.96 g/ cm3 7.87 g/cm3 2.7 g/cm3

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

Apiece of copper has a temperature of 75.6 0c. when the metal is placed in 100.0 grams of water at 19.1 0c, the temperature rises by 5.5 0c. what is the mass of the metal?

13. a covalent bond between two atoms is likely to be polar if: a. one of the atoms is much more electronegative than the other. b. the two atoms are equally electronegative. c. the two atoms are of the same element. d. the bond is part of a tetrahedrally shaped molecule. e. one atom is an anion.