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

True or False: The halogens are nonmetals with a - 1 charge. True False

As the elements in period 3 are considered in order from sodium to chlorine, there is an increase in the 1) atomic radius 2) electronegativity 3) number of electrons in the first shell 4) number of electron shells

Describe how fission produces electricity at nuclear power plants.

The purpose of a scientific investigation is

Why is air considered a fluid?

What are the properties of all metals

What happens when carbon dioxide at 74°C is placed in thermal contact with water at 14°C? Energy leaves the carbon dioxide and enters the water. The water gets hotter than the carbon dioxide. The temperatures of the two substances equalize.

What scientific knowledge was necessary for Kroto, Smalley, and Curl to discover buckyballs? Check all that apply. All matter is made of atoms. Atoms bond together in certain ways. Carbon atoms have a specific mass.

A 20.0 ml sample of 0.150 m ethylamine is titrated with 0.0981 m hcl. what is the ph after the addition of 5.0 ml of hcl? for ethylamine, pkb = 3.25

1. An atom that has an outer shell that is NOT full is (more likely OR less likely) to be reactive than an atom that has a full outer shell.