Chapter 1 Flashcards
Three basic states of matter
Solid, Liquid, Gas
Pure Substances
elements and compounds that cannot be separated into two different species by any physical means
Homogeneous Mixture
uniform mixtures, you cannot tell the components apart with any amount of magnification (ex. vinegar, clean air)
Heterogeneous Mixture
uneven texture, not uniform (ex. dirty air, seawater)
Molecule
The smallest amount of a compound with that compound’s properties (made of at least two atoms)
Compounds
Made up of atoms of at least two different elements (ex. copper(II) oxide CuO
Chemical Properties
what kind of reactions substances enter and how vigorous they are
Physical Properties
color, taste, odor, melting and boiling points, density, solubility in various solvents, heat, and electricity conductivity
Energy (E)
Capacity to do work or transfer heat
Heat (q)
Energy transferred from a hotter object to a cooler one
1 calorie (cal)
the amount of heat energy needed to warm up a 1.00g of pure liquid water by 1 degree, from 14.5 C to 15.5 C
1 cal=
4.184 Joules (J)
Potential Energy (E_p)
chemical potential energy reflects the relative position of atoms in molecules
What happens when atoms come together to form a bond in terms of energy?
Energy is released
What is needed to break a bond?
Energy
