Who extended the idea that the mass of the atom was concentrated within the nucleus?

Delia worked for 45 minutes on her oil painting. She took a break at 10:35 am at what time did Delia start working on the painting?

When a plant grows, its mass increases over time. Does this mean that new matter is created? Why or why not?

700 grams of glucose reacted fully with oxygen How many moles of gas will be created

Classify the following atom as excited, ground state, or not possible. 1s^2 2s^2 2p^6 3p^1

Because graphite contains carbon atoms that are covalently bonded to three other carbon atoms in the same layer, it is classified as a (an) ___ solid A. Metallic B. Amorphous C. Planner network D. Ionic E. Three-dimensional network

4Cr (s) + 3O2 (g) = Cr2O3 (s) Find the theoretical yield in moles and grams

Which isotope is used to date ancient artifacts such as fossils?

Bromine + calcium iodide  calcium bromide + iodine

Why do metals tend to lose electrons to form positive ions? A) They hold on tightly to electrons. B) A metals atom loses its few valence electrons to form a full octet.

2. To what volume will you have to dilute 20.0 ml of a 8 M HCl solution to make a 0.35 M HCI solution?