Judy wanted to figure out the mass of her backpack. She put the pack on a
balance and added 3, 6, and 4 kg weights so that the balance was even. What
is the mass of her backpack?

A) 5kg
B) 9kg
C) 10kg
D) 13kg

You have 125g of a certain seasoning and are told that it contains 76.0 g of salt what is the percentage of salt by mass in this seasoning

Compare and contrast physical changes with chemical changes.

Ageochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation? a. he is determining physical properties that are sufficient to identify the metal.b. he is determining chemical properties that are sufficient to identify the metal.c. he is determining physical properties that are insufficient to identify the metal.d. he is determining chemical properties that are insufficient to identify the metal.