6.1
What is anything that takes up space and has mass?
Matter
What are the tiny particles that swarm at tremendous speeds around the core of an atom?
Electrons
What is the symbol for hydrogen?
H
What is the most widely used halogen that is useful as a bleach and a germ-killing agent?
Chlorine
What are two or more atoms firmly bound together called?
Molecule
Which takes up more space, a pound of feathers or a pound of lead?
Feathers
What are the tiny particles that all matter are made of?
Atoms
What is a substance composed of only one type of atom?
Element
What is it called when a solid turns directly into a gas?
Sublime
What is the process in which atoms of elements or compounds are rearranged to form new substances?
Chemical reaction
Density = (??)/volume
Mass
What is the tiny, extremely dense core at the center of an atom?
Nucleus
What is the densest of all elements?
Osmium
What is the hardest of all known substances?
Diamond
What is the rapid reaction of any substance with oxygen?
Combustion
What is the densest of everyday metals?
Lead
What kind of particle has a positive charge in the nucleus of an atom?
Proton
What is the transuranium element that is the most abundant?
Plutonium
What is the colorless, odorless gas that makes up 78% of the earth’s atmosphere?
Nitrogen
What is a substance composed of more than one type of atom bonded together?
Compound
What is the study of what substances are made of and how one substance can be changed into another?
Chemistry
What is formed by electrons zooming around the nucleus of an atom?
Electron cloud
What are the highly reactive elements that tend to form compounds with alkali and alkaline earth metals?
Halogens
What are the elements in the last column of the periodic table of elements that do not combine with anything else expect under unusual circumstances?
Noble gases
What is a compound made of charged atoms?
Ionic compound