The smallest unit of an element that can exist
Atom
Physical or Chemical Change?
melting a crayon
Physical
TRUE OR FALSE
All compounds are molecules
TRUE
Protons are ________ charged
positive
Physical or Chemical Change?
Cooking scrambled eggs
Chemical
How many atoms of hydrogen are in the formula CH4?
4
Neutron is _______ charged
Neutral
If two objects have the same volume but different masses, which one will have a higher density?
The one with more mass
What 3 fundamental particles are atoms made of?
Double points if you can tell me which is positive, negative and neutral
Electron (-)
Protons (+)
Neutrons (Neutral)
What are the units for Density?
g/cm3 or g/mL
Melting point, boiling point, and freezing point are all examples of matter doing what?
Changing states
Which object has molecules that are moving?
Both have molecules that are moving.
A substance made of atoms of two or more different elements joined by chemical bonds is a what?
Compound
Find the Density with the following information
Mass= 72g
Volume= 9 mL
Density= 8 g/mL
Draw a water molecule using O for Oxygen and H for Hydrogen