ATOMS
What part of an atom has a positive charge and what part of an atom has a neutral charge?
Protons - positive
Neutron - neutral
Change of state is an example of a ____________ change
Physical
Is a piece of clay molded into a teddy bear a physical or chemical change?
Physical
Atoms in a molecule are _________________ joined
Chemically
The amount of space an object takes up is called
_______________
Volume
_______________ have negative charges and arrange themselves in around the _______________
Electrons
Nucleus
Process of a solid changing to a liquid is _______________
Melting
Evaporation is a substance changing from a ___________ to a _________?
Liquid to a Gas
How many elements in the following NaCl
2 - Na - sodium, Cl - chlorine
A combination of different substances that are not chemically joined ______________
Mixture
Two or more atoms chemically combined are called __________________
Molecules or Compounds
Water droplets forming on the outside of a cold bottle is an example of ______________
Condensation
What state of matter has a fixed volume but a shape that varies?
Liquid
How many atoms in the following H2SO4
7
Why does oil float on water
Oil is less dense than water
Elements are made from the same type of _____________
Atoms
The process of water changing to a gas is called ______________
Evaporation
The rusting of iron is an example of a ___________ change
Chemical
Which of the following is NOT a molecule:
N2; H2O2; HCl
N2
When particles move from an area of high concentration to an area of low concentration
Diffusion
True or False: the number of protons in an atom = the number of electrons.
True
When a gas changes to a solid without going through the liquid phase.
Deposition
Why is the burning of paper and the scrunching of paper 2 different types of changes
Burning paper - new substance is formed,
Scrunching paper - no new substance formed
True or False:
There are more elements in the world than there are molecules
False
What happens to particles in a liquid when it is cooled - 2 things.
Lose energy, move more slowly