10. How do substances change after a chemical reaction? cal

A They lose mass.

B Their atoms are rearranged.

C Their atoms lose electrons.

D They change phase.

What is the most basic building block of matter? the electron the proton the quark the atom 2nd question: Which part of an atom has a negative charge? neutron nucleus proton electron

Pb (OH) 2 + _HCI → __ H2O + _ PbCl2

Which particle moves around the nucleus? Electron Molecule Neutron Proton

Examine the general structure of a molecule. C is bonded to R to the left, C O O H above right, H right, and N H 2 below left.

What has 20 electrons in 44 Mass

How do you know if the reaction is exothermic or endothermic if both phase are same?

How many elements are in a set whole numbers between 3 and 15

Calculate the percent activity of the radioactive isotope strontium-89 remaining after 5 half-lives.

Describe 2 theories for yawning

When a bimetallic bar made of copper and iron strips is heated, the bar bends toward the iron strip. the reason for this is?